CN105594362A - Brush cutter with single-cylinder half-balance and parabola wing-shaped blade gasoline engine - Google Patents

Abstract

The invention discloses a brush cutter with a single-cylinder half-balance and parabola wing-shaped blade gasoline engine. A balance deflection angle phi is formed between the angle bisector of a central angle formed by the two lateral sides of an opening of a C-shaped ring (56a) for additionally arranging a crankshaft valve (56) on a crankshaft (57) of the brush cutter and the circle center of the crankshaft (57) and the center connecting line of the circle center of the crankshaft (57) and the circle center of the large end of a connecting rod, and the balance deflection angle is practically selected from 2 degrees to 22 degrees and now ranges from 10 degrees to 18 degrees. The half balance method of the single-cylinder engine is characterized in that the exciting force amplitude and the synthesis capsizing moment of a synthesis elliptic equation are reduced; the deflection angle substantially means that the balance gravity center is properly shifted, the condition that single-cylinder half balance can not be achieved is improved, and the mechanism is worthy of further detailed researching of people in the future. An inner metal cover, an outer resin cover and a logarithm runner (F7j3) are arranged in a silencer so that double-layer temperature reduction and noise reduction can be facilitated. Axial moving of the original taper of a magnetic flywheel is avoided. The equation of the arc shape of a blade is determined, the outer end of the blade is a sharp end and is provided with a blade opening, and winding objects can be cut off.

Description

The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine

Technical field

The invention provides and a kind of cut off shrub for places such as flower bed, garden, park and road sides, the cutting of flowers and trees shapingFilling machine band grass-mowing machine, belongs to machine field, gardens. With by the innovative approach of indirectly discharging after the catalase hush tube of a meter five, be to expandPurposes installs band additional and cuts the moving head of piling up neatly the wire of beating the grass and disc cutterbar and controlization device four bifurcateds of being with inside and outside sawtooth on brush cutterNozzle, and be convenient to press grass to preserve soil moisture and the long grass pressing wheel of meadow decorative pattern, to form low emission gasoline brush cutter. There is the burning of function waveChamber and with the collocation of internal combustion engine ignition device that has active receiving electrode and fine motion discharge electrode, have in Jia Shuanfu shirt rim, piston skirtReduce hydrocarbon emission, and logarithmic differentiation isogonal line shirt rim, piston skirt turbulent flow returns to alter and fall row, narrow left and right blockTwo auxiliary blow vents reduce the several different methods of discharge, and the brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine is lowThe engine of discharge is inventor's crystallization that lifetime, domestic and foreign experience was groped; Known two to rush petrol engine discharge difficult up to standard,Existing energy is up to standard, and it has been determined and started batch product in two application of rushing gasoline engine scavenging road junction, having indicated low emission in 20 years from now onThe developing direction of two stroke engine and brush cutter and grass-mowing machine, has started low emission new of brush cutter two cycle engineTechnical field, in tool, the double-deck cooling of metal cap and outer resin cover silencer also can be used for multiple fields.

Background technology

Brush cutter is widely used in the places such as flower bed, garden, park and road side and cuts the grass on a lawn, tending ot young growth, teaGarden is upgraded, and herbage harvesting, returns crop stocks to the field, and flowers and trees shaping etc. cut off the operation of shrub branch; Selected by people's hobbyMode is carried out brush. When some operation pedestrian likes and is accustomed to using brush cutter, in the local time of particularly running into corner, use energeticallyPress mobile jib, do mobile jib often location is incessantly fixed and trace waves. Operation pedestrian's height difference, and custom is taked workMake the difference of angle, need mobile jib adjustable length, and the round type linkage of original location mobile jib leaves and easily causes mobile jib traceThe shortcoming of rocking. Low vibratility and the low noise of low vibration lawn mower,, can have at the foamed plastics of stock plus-minus vibration if considerCertain curative effect; And vibration and the very large root of noise be not only in precision and the form and position tolerance of power and instrument, and be mechanism,Catalyst, hush tube, vibration-damped handle, cutter coordinates with the harmony of engine, pursues low vibration and the low emission fact of grass-mowing machineOn be a hard nut to crack of leaving over for a long time. Adopt two stroke engine can improve power per liter with respect to four-stroke engineMore than 50%, but in discharge, be really difficult up to standard, this is a part of problem of the present invention; Grass-mowing machine is portable dam, wishesPower is gently little; Two-stroke or four-stroke gasoline engine are all wanted igniter, and engine spark plug, is widely used in arteries and veinsThe current voltage of leaping high is introduced into combustion chamber, and make the gaseous mixture sparking of inspiration cylinder and light, and then diffusion combustion break out work done.The outside coupling of existing spark plug and having between the spark cap of rubber jar, has the loose loose phenomenon of pine sometimes. Existing fireThe inside of Hua Sai, makes resistance and only has impedance though be provided with glass-sealing agent; If the induction reactance of adding and capacitive reactance, form suitable RCL and returnRoad, has the effect that more preferably suppresses radio interference. Multiple tracks umbrella rib on insulator also can be improved by semi-circular cross-sectionFor saw-tooth shaped cross section, so that the creepage passage of more insulation and better block rubber jar. The metal shell of existing spark plugHeat radiation also can further improve. The electrode of existing spark plug, well imagines, have easily coking, easily ablation, single-point arcing, low temperatureThe shortcoming of difficult point; If be movable electrode innovation, when there being improvement. Moreover original combustion chamber has multiple, but do not have perfectTen U.S.s; Except crossing advantage, there is weak point; For example wedge-section combustion chamber, its gaseous mixture undue concentration is in spark plug place, operating modeSeem rough; And for example bathtub shaped combustion chamber, the shape of its prolate, makes the effect of squish poor, and flame travel is alsoLonger, burn rate is lower, and burning time is long, and rate of explosion is low, and surface to volume ratio F/V is larger, and to HC, discharge is disadvantageous.And for example bowl-in-piston chamber, hemispherical combustion chamber, fluffy shape combustion chamber, and other types combustion chamber, as the auxiliary combustion of turbulizationChamber, dual ignition plug combustion chamber, the combustion chamber of plane, each has something to recommend him; But the invention that the mankind aspire after perfection is endless, pistonAlso there are very large potentiality to dig. The so-called best geometry of combustion chamber and piston is no doubt important, but will with engine model adaptationAnd arrange in pairs or groups with igniter, just there is preferably effect. Particularly two-stroke gasoline engine is than the fuel economy of four-stroke gasoline enginePoorer, the hydrocarbon emission in tail gas often exceeds standard. Combustion chambers of internal combustion engines and piston and with the collocation of igniter, be oneRelate to the hard nut to crack of energy-saving and emission-reduction. If exert oneself less by four-stroke engine; If with booster, volume is large; If use bavinOil turbine is the easy dirty dirty person; By the waste gas of putting that runs near people's engine direct, around engine, hover, part waste gasThe launched machine air filter of meeting and carburetor air mouth suck, and part waste gas can be sucked by people. Brush cutter can only brush and can notBeat the grass; Just can dual-use if install moving head additional at cutter head; The meadow of just having beaten, some grass has and is pulled out loose phenomenon, ifWith grass pressing wheel, not only there is the effect of pressing grass soil moisture conservation and extruding meadow decorative pattern, and make smooth operation and laborsaving; Common flat swordBush knife, because the effect of sliding cutting is more than the effect of impact cutting, encountering hard branch bar just has cutter relieving phenomenon sometimes, if use band portion sawtoothCutter just can improve; It is long to cut buttress wire life-span of beating the grass; If can further optimize admission with the improvement of carburetor four bifurcated nozzles;And the discharge of known two-cycle gasoline engine difficult up to standard after, if be used in Jia Shuanfu shirt rim, piston skirt and tool half balance drift angle and throwingThe engine of thing line mean camber line air-foil blade, when can further improveing. Silencer scorches not security of staff sometimes. The former tapering of magnetic flywheelThere is axial float.

Summary of the invention

In order to make up the shortcoming due to the existing mechanism of grass-mowing machine, make mobile jib location reliably and micro-waving not, make brushLow vibratility and the low noise of machine are improved, and improve and exert oneself and cutting effect, reduced exhaust, the inventor has done many brushThe improvement of machine grass-mowing machine, with containing the single-cylinder air-cooled petrol engine of small two-stroke that improves many scavenging ports, as 1E37F, former lengthBar changes the hush tube of many honeycombs and catalyst into, has transparent protective cover, has the bush knife of periphery blade and interior all blades, has limitFlange and lateral filament button be difficult for loosening stock interface, have spiral spring or wave spring and the handgrip of vibration damping has inside spin whirlpool nozzleCarburetor, form the novel brush cutter that has catalase hush tube and swirl sprayer and two to rush many scavenging ports gasoline engine, be a kind ofLow emission gasoline brush cutter. Brush cutter can only brush and can not be beaten the grass; Just can dual-use if install moving head additional at cutter head;The meadow of just having beaten, some grass has and is pulled out loose phenomenon, if with grass pressing wheel, not only have the effect of pressing grass soil moisture conservation and extruding meadow decorative patternReally, and make smooth operation and laborsaving; The bush knife of common flat sword, because the effect of sliding cutting is more than the effect of impact cutting, encountersA hard branch bar just has cutter relieving phenomenon sometimes, if just can improve with the cutter of band portion sawtooth; It is long to cut buttress wire life-span of beating the grass; If with changingAdmission can be further optimized in the improvement of oil device four bifurcated nozzles; And known two to rush petrol engine discharge difficult up to standard, find to be used inJia Shuanfu shirt rim, piston skirt and return the low emission two of altering sheet at scavenging road junction with wedge turbulent flow and rush petrol engine, when entering oneStep improvement and make brush cutter and grass-mowing machine up to standard. Therefore for expanding purposes, on low emission gasoline brush cutter basis, install additional and beat the grassHead, grass pressing wheel, band serrated knife, cuts and piles up neatly the wire of beating the grass, and the improvement of carburetor four bifurcated nozzles, forms low emission gasoline cuttingFilling machine. The engine of low emission, be in the combustion chamber that has function wave of the improvement of internal combustion engine and with have active receiving electrode and fine motionOn the basis of the collocation of the internal combustion engine ignition device of discharge electrode, and reduce hydrocarbon row in Jia Shuanfu shirt rim, piston skirtOn the petrolic basis of putting, and return and alter the vapour that falls row at logarithmic differentiation isogonal line shirt rim, improved piston skirt turbulent flowOn oil turbine basis, the further improved two auxiliary blow vent that narrows left and right block reduces two of discharge and rushes petrol engine,Belong to the combustion chamber of internal combustion engine and the technical field of turbulent scavenging. Petrol engine is rushed in low emission two, is to collect for many years warp both at home and abroadTest the crystallization of groping; Its usefulness is to have obtained beyond thought reduction of discharging effect up to standard, and brush grass-mowing machine is dual-purpose.

Silkworm in spring to dead silk not to the utmost, is improved invention and has no limits; Wear out iron shoes on a rare occasion to obtain, clino-diagonal is warded off in energy-saving and emission-reduction. Everybody knowsTwo impact machine discharges often exceed standard, but nobody can thoroughly solve; Described scavenging road junction wedge turbulent flow returns alters sheet, is sweeping at two qi of chong channel ascending adversely cylindersGas port adds small pieces, seems simple, and but nobody can find out; Be who unexpected to go to burn-on at the scavenging road junction place of cylinder one littleSheet is loaded on starts the engine and contacts with high speed piston, but the sudden caprice of often having an examination in arms just has amazing effect,What this is, this is invention just not? this is after travelling far and wide in search of it, and thousand consider and even have one, are again to grope for many years and stateThe crystallization of inside and outside experience, has really received and has reduced discharging effect up to standard. Moreover the carburetor of engine has the potential to be tapped very much, establish four pointsFork nozzle refers to that on the outlet of the nozzle of the inside of carburetor, establishing 4 gaps week along ring is four bifurcated nozzles, therefore improvementMix combustion vapour and be beneficial to atomization through the fluid state in gap. Although spark ignition process and two is rushed detailed physical and chemical processes veryComplexity, the mankind still have many aspects not clear so far, but we perhaps can tentatively think, this scavenging road junction wedge turbulent flowReturn and alter sheet, at scavenging road junction, place produces turbulent flow with wedge, and waste gas after burning is returned to the possibility that channels to gas handling system retardanceEffect, its doubtful turbulent flow that belongs to is taken a breath, for known cross flow scavenging, loop scavenging and the uniflow scavenging three of two-stroke internal combustion engineKind of ventilation scheme, opened up one can reduce discharging alter the approach of sheet for turbulent time at scavenging road junction wedge, referred to as turbulent flowThe clino-diagonal of scavenging, or the shortcut of low emission. Although the mechanism of its atom level needs to be explored future, it rushes gasoline engine scavenging twoThe application at road junction has been determined and has been started batch product, represented the developing direction of 20 years low emission gasoline brush cutters from now on. Cutting buttress beatsGrass wire is durable more than nylon wire, is not only beneficial to long-acting cutting, few with line, saves into dish nylon wire; And can beat the grass, alsoCan cut straw, and nylon wire cuts motionless thin bar; While cutting different object, beat the grass wire and disc cutterbar complement each other each has something to recommend him.Its roller length of long grass pressing wheel diameter that equals to beat the grass just in time can be pressed onto the grass just having cut, to press careless successful. With thinLong grass pressing wheel, so that press grass soil moisture conservation, material-saving, rolls that to cover face high, meadow embossing is attractive in appearance.

The present invention solves technical scheme and the method that its technical problem takes:

Described brush cutter, adopts tool single cylinder half balance and parabola air-foil blade gasoline engine, is starting of low emissionMachine, it is near piston top dead-centre, before the ignition of mixed gas in cylinder above compressed piston, due to piston train of dressIn portion, move and the preparation air entry in latch-release cylinder is opened, in the crankcase below piston, sucking the mixing of fuel and airGas; Due to the pressure of the burning gases above the piston of igniting generation, piston moves from top dead-centre to bottom dead centre direction and is same againTime close air entry, the gaseous mixture in compression crankcase, above near piston bottom dead centre, from open and close exhaust outlet make in cylinderBurning gases when discharging to outdoor gas, the scavenging path being connected with cylinder by crankcase is opened on pistonClose in cylinder, by preparation scavenging port, gaseous mixture is imported to the two cycle engine in cylinder from crankcase; The design has with bent axle sameThe valve gear of step, this valve is from crankcase to cylinder scavenging mouth, the crankcase side of scavenging path is configured to normally closed; ?When the valve-closing of the crankcase side of scavenging path, the gaseous mixture in scavenging path is by the combustion that makes it to ignite of the flame of combustion gasBurn, after HC reduces, again from crankcase to scavenging port, the crankcase side of scavenging path makes it opening, uses in the burning of scavenging pathWhen gaseous mixture is sent, the gaseous mixture in crankcase was closed exhaust outlet before exhaust outlet is discharged from, and Here it is makes HC'sDischarge the two cycle engine significantly reducing; Filter screen (58) in described scavenge trunk or be located at technique butt strip (55) side, orPerson is located under scavenge trunk; The filter screen of described scavenge trunk is to be formed through knitting device by many wire, to gas in cylinder and songBetween axle box, breathe and have filtration regulating and controlling effect; Be equipped with multiple wedges (11b) that noise control filter screen is provided with, described wedge is multiple hollowsSix prismatics, have aperture on top, the advanced wedge compression of air-flow, then overflow and expand from wedge aperture, there is noise elimination effect; Be equipped with again catalystVolume (59), its platiniferous rhodium indium iridium, has catalyst effect to flowing through gas, the ingenious discharge that slows down pneumatic noise and HC.

The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine, total containing stock, cutter, manipulating handgripBecome, described stock containing aluminum pipe, is provided with power transmission shaft in the cavity that described aluminum pipe inside is provided with, described aluminum pipe and power transmission shaft itsIt is engine that engine is equipped with in upper end, and its lower end of described aluminum pipe and power transmission shaft is equiped with described cutter, the middle part of described aluminum pipeBe equiped with handgrip; It is engine (1), hexagon socket cap head screw M6x30 containing described two-cycle gasoline engine for described brush cutter(2), hexagon socket cap head screw M5x8 (3), 31 type hex nut M6 (4), PP wire clamp (5), PA suspension ring (6), 41 types are non-Metal embedded part type hexagonal locknut M5 (7), POM suspension ring holder (8), hexagon socket cap head screw M5x20 (9), the front aluminum pipe that connects(10), manipulating handgrip assembly (11), control handle pipe (12), 13 band bullet pad hexagon socket cap head screw M5x25 (13), handgripsHolder train wheel bridge (14), handgrip holder (15), left hand handle component (16), acrylonitrile-butadiene rubber handgrip shock-absorbing sleeve (17), handgrip are solidReservation lower plate (18), left handle pipe (19), five leaf nylon tubesPower transmission shaftZanjon ball journalHold III (22), bullet pad 6 (23), hexagon socket cap head screw M6x23 (24), aluminium tube joint (25), locking knob (26), transmissionShaft coupling (27), rear aluminum pipe 4 hexagon socket cap head screw M5x12 (29), 4 spring washers 5(30), spacing handle spring (31), spacing handle lock (32), spacing handle (33), split washer 2.5 (34), protective cover are fixedSeat (35), circlip for hole 26 (36), circlip for shaft 10 (37), small arc-shaped gear (38), small arc-shaped gear oil block up(39), hexagon socket cap head screw M6x14 (40), hexagon socket cap head screw M6x10 (41), plain washer 6 (42), gear-box(43), orthodrome gear (44), splined shaft (45), deep groove ball bearing 6002I (46), circlip for hole 32 (47), gear-boxGuard shield (48), spline pad (49), disc cutterbar are containing 3 tooth disc cutterbars (50) or 2 tooth disc cutterbars (63) or 4 tooth disc cutterbar (64) or 8 teethDisc cutterbar (65), cutterhead pressing plate (51), cutterhead guard shield (52), 1 type hex nut M10 left-handed (53) or nylon moving head (54),Braces (55), hexagon nut with flange M5 (56), small blade (57), knife rest (58), cross recessed pan head tapping screw ST4x14(59), protective cover A (60), shielding support (61), hexagon socket cap head screw M5x35 (62), left hand are (16-1), 1 type sixAngle head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head Screw M5x30 (16-4), there is pallet(67) waistband (66), auxiliary ball (68), the catalyst hush tube (69) of turning; Described gasoline engine (1), with 1E39F, single cylinder and 39Cylinder diameter and air-cooled, it is containing starter assembly (F1), startup driver plate assembly (F2), 2 oil sealings (F3), right case (F4), 2 zanjonsHexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6) in ball bearing II (F5), 2 moment of torsion 7-9NM, containing catalyst hush tube (69)Muffler ASSY (F7), silencer pad (F8), the right shock-reducing sleeve of fuel tank (F9), 2 retaining ring for piston pins (F10), piston pin(F11), needle bearing (F12), piston (g31), piston ring (F14), crank assemblby (F15), woodruff key (F16), cylinder block pad(F17), cylinder block (F18), 2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19), engine outer cover (F20), coiled hair self tappingScrew ST5 × 14 (F21), igniter assembly (F22), 2 cross fluting screw assemblies M4 × 20 (F23), spark plugs (F24),Without asbestos packing sheet mould assembling pad (F25), 2 mould assembling alignment pins (F26), left box body (F27), 5 cross fluting screw assemblies M5× 25 (F28), magnetic flywheel (F29), clutch assembly (F30), clutch disk (F31), circlip for shaft (F32), a fuel tank left sideShock-absorbing sleeve L (F33), the right shock-absorbing sleeve R of fuel tank (F34), inserts bearing connection seat (F35), 3 cross fluting screw assemblies M5 × 20(F36), train wheel bridge shock-absorbing sleeve (F37), lower plate shock-absorbing sleeve (F38), train wheel bridge (F39), lower plate (F40), 2 interior hexagonal circlesColumn cap screw assemblies M5 × 18 (F41), flame-out wire clamp (F42), air filter seat (F43), 2 air filter seat pad covers (F44), softPolyurethane foam filter core (F45), air filter pressing plate (F46), 2 M5 bullet pads (F47), 2 cross fluting coiled hair bullet screw M5 ×63 (F48), air filter lid (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50), 2 air inlet pipe pads (F51), deflector(F52), polyphenylene sulfide PPS air inlet pipe (F53), grounding wire component (F54), total without asbestos packing sheet carburetor packing (F55), carburetorBecome (F56), PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil resistant butadiene-acrylonitrile rubber oil base (F59), fuel oilCleaner assembly (F60), oil pipe clip (F61), HDPE blowing fuel tank (F62), cap assembly of fuel tank (F63), 5-7NM hexagon-headed boltPlain cushion combination M6X14 (F64), 4 3-5NM cross fluting screw assemblies M5X18 (F65), it comprises described brush cutterTwo cycle engine, by described hexagon socket cap head screw M6x30 (2), hexagon socket cap head screw M5x8 (3) and 31Type hex nut M6 (4), with described before connect aluminum pipe (10) and be connected; Before described, connect the outside of the pipe of aluminum pipe (10), by instituteThe PP wire clamp (5) stated, PA suspension ring (6), 41 type non-metallic insert hexagonal locking nut M5 (7), POM suspension ring holder (8), inHexagonal cylindrical head screw M5x20 (9) also forms braces part with braces (55), to braces is worn on single shoulder; DescribedBefore to connect aluminum pipe (10) upper, be equiped with manipulating handgrip assembly (11), be by controlling hexagonal cylindricals in handle pipe (12), many band bullet padsScrew M5x25 (13), handgrip holder train wheel bridge (14), handgrip holder (15), left hand handle component (16), acrylonitrile-butadiene rubber handShock-absorbing sleeve (17), handgrip holder lower plate (18), left handle pipe (19) are formed jointly; Before described, connect aluminum pipe(10) inside of pipe, is equiped with five described leaf nylon tubesPower transmission shaftAnd deep-groove ballBearing I II (22) is so that transmission; Before described, connect aluminum pipe (10) by described bullet pad 6 (23), hexagon socket cap head screwM6x23 (24), aluminium tube joint (25), locking knob (26), shaft adapter (27), be connected with described rear aluminum pipe (28), andBy 4 hexagon socket cap head screw M5x12 (29), 4 spring washers 5 (30), spacing handle spring (31), spacing handle lock(32), spacing handle (33), split washer 2.5 (34) and form spacing Handleset; In the end of described rear aluminum pipe (28),Be equiped with described protective cover holder (35), circlip for hole 26 (36), circlip for shaft 10 (37), small arc-shaped gear(38), small arc-shaped gear oil stifled (39) and many band bullet pad hexagon socket cap head screw M5x25 (13), interior hexagonal cylindrical head spiral shellsNail M6x14 (40), hexagon socket cap head screw M6x10 (41), plain washer 6 (42) and gear-box (43), orthodrome gear(44), splined shaft (45), deep groove ball bearing 6002 (46), circlip for hole 32 (47), gear-box guard shield (48), spline pad(49), 3 tooth disc cutterbars (50), cutterhead pressing plate (51), cutterhead guard shield (52); Described cutter containing protective cover and moving head andDisc cutterbar is to select; Dress 1 described type hex nut M10 left-handed (53) for cutterhead; Or dress nylon moving head (54) is with generationFor disc cutterbar, and the cut-out described small blade (57) that line uses of beating the grass, by hexagon nut with flange M5 (56), knife rest(58), cross recessed pan head tapping screw ST4x14 (59) is contained in described protective cover A (60) above, and shielding support will be installedAnd hexagon socket cap head screw M5x35 (62) (61); Cutterhead can multiselect, or 2 tooth disc cutterbars (63), or 4 tooth disc cutterbars (64), or8 tooth disc cutterbars (65), so that the shrub of different cultivars is cut in choosing; Described left hand handle component (16), by left hand handle (16-1), 1 typeHex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head Screw M5x30 (16-4) form,Be arranged in left handle pipe (19); And have the waistband (66) of pallet (67), can tie up to people's waist, pallet (67) and the auxiliary ball that turns(68) movable contact, auxiliary turn ball (68) and is connected with engine outer cover (F20), to further lengthen cut coverage; Catalyst disappearsSound pipe (69), the gas outlet of connection muffler ASSY (F7), so that waste gas is discharged near cutter through aluminum pipe; Two described punchingsThe engine start part of journey gasoline engine comprises starter assembly (F1), starts driver plate assembly (F2), is furnished with 2 oil sealings (F3)With 2 deep groove ball bearing II (F5), to be contained in rotationally on the described right case (F4) of engine; By 2 moment of torsion 7-9NMInterior hexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6), the muffler ASSY (F7) containing catalyst hush tube (69) and noise eliminationDevice pad (F8), is fixed on cylinder block (F18); The right shock-reducing sleeve of fuel tank (F9) is housed on cylinder block (F18); At cylinder block(F18) 2 retaining ring for piston pins (F10), piston pin (F11), needle bearing (F12), piston (g31), piston ring (F14) are housed inAnd crank assemblby (F15), on bent axle, establish woodruff key (F16); Cylinder block pad (F17) is mounted on cylinder block (F18); In 2 sixSocket cap screw assemblies M5 × 20, angle (F19) and recessed pan head tapping screw ST5 × 14 (F21) are fixed on engine outer cover (F20)On cylinder block (F18); Igniter assembly (F22) is fixing by 2 cross fluting screw assemblies M4 × 20 (F23); Spark plug(F24) be also contained on cylinder block (F18); On cylinder block (F18), put without asbestos packing sheet mould assembling pad (F25), 2 mould assembling locationPin (F26), and with fixing left box body (F27) in 5 cross fluting screw assemblies M5 × 25 (F28); Magnetic flywheel (F29) is contained in bent axleUpper, and match with clutch assembly (F30), clutch disk (F31) and circlip for shaft (F32); The left shock-absorbing sleeve L of fuel tank(F33) and the right shock-absorbing sleeve R of fuel tank (F34) to be contained in described outer cover (20) upper, inserts bearing connection seat (F35) is by 3 crossesFluting screw assemblies M5 × 20 (F36) fix; Train wheel bridge shock-absorbing sleeve (F37), lower folder are housed on described connection seat (F35)Plate shock-absorbing sleeve (F38) and train wheel bridge (F39) lower plate (F40), and with 2 interior hexagonal cylindrical head screw assemblies M5 × 18(F41) clamp; Flame-out wire clamp (F42) is also housed on described connection seat (F35); Air filter seat (F43), 2 air filtersSeat pad cover (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46) are by 2 M5 bullet pads (F47) and 2 tenWord fluting coiled hair bullet screw M5 × 63 (F48) air filter lids (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50) compositionAir filter, and be packed on carburetor; 2 air inlet pipe pads (F51), deflector (F52), polyphenylene sulfide PPS air inlet pipe (F53), connectGround line component (F54), without asbestos packing sheet carburetor packing (F55), carburetor assembly (F56) composition carburetor; PU yellow transparentOil return pipe (F57), PU black oil inlet pipe (F58), oil resistant butadiene-acrylonitrile rubber oil base (F59), fuel filter assembly (F60), oilPipe clamp (F61), HDPE blowing fuel tank (F62), cap assembly of fuel tank (F63) composition fuel tank; And the combination of 5-7NM hexagon-headed bolt plain cushionM6X14 (F64) is fixing described startup driver plate assembly (F2) use, as for 4 3-5NM cross fluting screw assemblies M5X18(F65) be the use of fixing described starter assembly (F1); The described waistband that has pallet (67) (66) is provided with pallet(67), on pallet (67), can place the auxiliary ball (68) that turns, and auxiliaryly turn ball (68) and be contained in external engine, or directly by brushMachine engine is placed on the operation that comes up of pallet (67) that waistband (66) is provided with; Pallet (67) and auxiliary ball (68) movable contact that turns,Auxiliary turn ball (68) and be connected with engine outer cover (F20), to further lengthen cut coverage; Catalyst hush tube (69), oneTermination is led to the gas outlet of muffler ASSY (F7), before another termination, connects aluminum pipe, so that waste gas aluminum pipe after described, and from cutterNear discharge; Described catalyst hush tube (69) is aluminum, has waste gas by there is aluminium dioxide catalyst effect; Described disappearsSound device assembly (F7) is aluminum, has waste gas by just there being aluminium dioxide catalyst effect; Before described, connect aluminum pipe (10) and rear aluminiumPipe (28) separates, and has waste gas by there is aluminium dioxide catalyst effect; Five leaf nylon tubes in described rear aluminum pipe are establishedFoam honeycomb body, and add catalyst catalyst at foam honeycomb body, so as to have waste gas by time have a catalyst multiple catalyzing effect; Described2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65) for selecting, are commonly referred to as the disc cutterbar of cutter, it is at cutterDish periphery is provided with multiple outer cutting edges (641), so that the few cutter relieving of brush; Described 2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8Tooth disc cutterbar (65), it is provided with multiple inner cutter holes (642) in cutterhead periphery, so that card branch in brush not; At described carburetorIn assembly (F56), improve the interior straight tube (70) of atomizer for there being the vortex spray bar of helicla flute (71), be beneficial to disperse mix and imitateReally; In described carburetor assembly (F56), improve the interior straight tube (70) of atomizer or have the vortex spray bar of helicla flute (71)Import for there being parabolical horn mouth (72), or conical section is as the horn mouth of archimedes curve, is beneficial to polymerizationContaminated product effect; Upper in described left handle pipe (19), (19b) taken in the damping that is provided with close circle helical spring shape, so that furtherDamping; Employing has protective cover transparent or partially transparent (60), in order to convenient observation brush operation; This brush cutter is to adoptWith the brush cutter of the single-cylinder air-cooled tool single cylinder half balance of small two-stroke and parabola air-foil blade gasoline engine, belong to low emissionEngine, be in the combustion chamber that has function wave of the improvement of internal combustion engine and with the internal combustion that has active receiving electrode and fine motion discharge electrodeOn the basis of machine with the collocation of igniter, and start at the gasoline of Jia Shuanfu shirt rim, piston skirt reduction hydrocarbon emissionOn the basis of machine, and return and alter the petrol engine basis that falls row at logarithmic differentiation isogonal line shirt rim, improved piston skirt turbulent flowUpper, the further improved two auxiliary blow vent that narrows left and right block reduces two of discharge and rushes petrol engine; Add in piston skirtTwo auxiliary shirt rims, have and reduce discharging effect up to standard; Logarithmic differentiation isogonal line shirt rim, piston skirt turbulent flow returns alters the petrol engine that falls rowTo be equipped with two auxiliary shirt rims (g37) in the skirt section of piston (g31); Described two auxiliary shirt rim (g37) is retaining original pistonDo not have on the basis of former two shirt rims of the bilateral of connecting rod pin-and-hole, and under the bilateral that has connecting rod pin-and-hole in the skirt section of piston (g31)Limit, an auxiliary shirt rim is also added on every one side, becomes two auxiliary shirt rims (g37); Described two auxiliary shirt rim, its containing base (g38), underThe through hole (g43) of the concave arc limit (g42) on fillet (g39), side (g40), upper fillet (g41), base, two auxiliary shirt rims of piston,Piston skirt is located at shirt rim with isogonal a section of logarithmic differentiation equation, and it is conducive to auxiliary guiding, additional turbulence return alter andRow falls, and lubrication assistant and heat radiation; Described two auxiliary shirt rim or with aluminium alloy, or with composite to reduce cylinder prepareding gap;Each auxiliary shirt rim of described two auxiliary shirt rim (g37) and described former two shirt rims are all cylindrical along outside piston weekExtend, and its projection is thrown on the face vertical with piston movement direction along the outside piston week quartering; Described two auxiliary skirtIt is longer that each auxiliary shirt rim on limit (g37) extends along the cylinder in outside piston week than described former two shirt rims, namelySay, the base (g38) of two auxiliary shirt rims is than the base of former two shirt rims distance connecting rod in the direction of the cylinder extended line along pistonPin-and-hole is farther, and two auxiliary shirt rims are higher, and piston and skirt section are longer, and its effect is to be conducive to the guiding length of lengthened piston and to assistGuiding; The both sides of described two auxiliary shirt rim (g37) are provided with the side (g40) of two auxiliary shirt rims, and it connects piston (g31) and two auxiliary skirtThe base (g38) on limit; The both sides of described two auxiliary shirt rim (g37), are provided with the base (g38) that connects piston (31) and two auxiliary shirt rimsThe side (g40) of two auxiliary shirt rims, the angle of the side (g40) of its both sides is greater than 100 degree; Two of described two auxiliary shirt rim (37)Side is provided with the side (g40) of two auxiliary shirt rims, and it is to connect piston (g31) by the upper fillet (g41) of the side of two auxiliary shirt rims; The both sides of described two auxiliary shirt rim (g37) are provided with the side (g40) of two auxiliary shirt rims, and it is by the side of two auxiliary shirt rimsLower fillet (g39) connects the base (g38) of two auxiliary shirt rims; On the base of described two auxiliary shirt rim (g37), establish concave arc limit(g42); Described concave arc limit (g42) or circular arc, or involute, or parabola, fall row in order to assisting; Described is two auxiliaryOn shirt rim (g37), establish through hole (g43), or pit, in order to lubrication assistant and heat radiation; Go up and piston described two auxiliary shirt rim (g37)Be provided with multiple through holes (g43), it is slightly del arranges, and has many rows, and the most descending through hole is few, and the Kong Yue that more up works is many,In order to lubrication assistant and heat radiation; Cylinder body (g44) be two rush petrolic on the cylinder chamber of dress piston along Central Symmetry groundContain around the cylinder body (g44) at each one scavenging road junction (g45), sweeping of the symmetrical left and right each of described cylinder body (g44)On gas port (g45), each ground, left and right is provided with wedge turbulent flow time and alters sheet (g46) symmetrically, utilizes the logatithmic spiral tool of higher mathematicsThe feature that pressure angle is equal, making described wedge turbulent flow time alter sheet has by one section of the logatithmic spiral of logarithmic differentiation equation, gushesMixed air-flow thereon just easily steadily, blocks waste gas and returns and alter to fall in order to utilize equal pressure angle to produce turbulent flow at scavenging road junction placeLow emission; Described wedge turbulent flow returns lower the stopping of closing on that alters sheet (g46) and be located at the bottom of the below at the scavenging road junction (g45) of cylinder bodyOne side of outlet of the scavenging air belt of pressing close to piston of point, a section of its tool logatithmic spiral; Described wedge turbulent flow returns alters sheet (46)Comprise wedge turbulent flow and return turbulent wedge (g48), the wedge that goes back to the logical scavenging road junction of altering sheet of scavenging road junction (g47), wedge of altering sheetTurbulent flow time is altered the returning of logical scavenging road junction of sheet and is altered grid (g49), the turbulent turbulent shield (g50) that goes back to the logical scavenging road junction of altering sheet of wedge,All one section of tool logatithmic spiral; Described wedge turbulent flow time is altered sheet (g46) and is slightly inclined wedge-shaped, and the large end of described inclined wedge-shaped connectsIn one of the outlet of the scavenging air belt of pressing close to piston that closes on lower dead center of the bottom of below at the scavenging road junction of cylinder body (g45)Side, a section of its tool logatithmic spiral; Described wedge turbulent flow returns alters the turbulent scavenging air belt of altering sheet that returns of wedge that sheet (g46) comprisesMouth (g47) is located at described wedge turbulent flow and goes back to the top of altering sheet (46), that is to say the wedge of altering sheet (g46) at wedge turbulent flow timeOne section of its tool logatithmic spiral of the small end of shape; Described wedge turbulent flow returns alters the described wedge turbulent flow time that sheet (g46) comprisesThe wedge (g48) of altering the logical scavenging road junction of sheet is located at wedge turbulent flow time and alters the inner side of sheet (g46) and the scavenging road junction with cylinder body(g45) the bottom connection of below, a section of its tool logatithmic spiral of described inner side; Described wedge turbulent flow returns alters sheet(g46) the described wedge turbulent flow comprising returns the returning of logical scavenging road junction of altering sheet and alters grid (g49) and be located at wedge turbulent flow and return and alter sheetWith the intersection of a side of the outlet of the scavenging air belt at the scavenging road junction (g45) of cylinder body, a section of its tool logatithmic spiral; Described is obliqueWedge turbulent flow returns alters described wedge turbulent flow that sheet (46) comprises and returns the returning of logical scavenging road junction of altering sheet and alter grid (g49) and be located at wedgeTurbulent flow returns the chamfering place of a side of the outlet of the scavenging air belt at the scavenging road junction (g45) of altering sheet and cylinder body, one of its tool logatithmic spiralSection; Described wedge turbulent flow returns alters described wedge turbulent flow that sheet (g46) comprises and returns the returning of logical scavenging road junction of altering sheet and alter grid(g49) be located at wedge turbulent flow and go back to the rounding place of a side of the outlet of the scavenging air belt at the scavenging road junction (g45) of altering sheet and cylinder body, itsOne section of tool logatithmic spiral; The wedge turbulent flow that is provided with above that described wedge turbulent flow time is altered sheet (g46) returns the logical scavenging air belt of altering sheetThe turbulent shield (g50) of mouth, its one end and the outlet that is located at the turbulent scavenging air belt that goes back to the scavenging road junction (g45) of altering sheet and cylinder body of wedgeThe crossing chamfering place of a side be connected, and its other end and wedge turbulent flow go back to the top of altering sheet and that is to say with wedge turbulent flow time and alterThe small end of the inclined wedge-shaped of sheet (g46) is connected; And described turbulent shield above it also has a section of logatithmic spiral; Narrow left and right caseThe two auxiliary blow vent of seat reduces two of discharge and rushes petrol engine, contain left block, right block, piston and combustion chamber, spark plug,Gray iron, cylinder barrel, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, cooling system, describedCylinder body (g44) be two rush petrolic on the cylinder chamber of dress piston along Central Symmetry contain each one scavenging air belt aroundThe cylinder body (44) of mouthful (g45), upper at the scavenging road junction (g45) of the symmetrical left and right each of described cylinder body (g44), respectively symmetricallyEach ground, left and right is provided with wedge turbulent flow time and alters sheet (g46); The skirt section of described piston is equipped with two auxiliary shirt rims (g37); DescribedTwo auxiliary shirt rims (g37) are on the basis of former two shirt rims of the bilateral that there is not connecting rod pin-and-hole of the original piston of reservation, and at piston(g31) bilateral that has connecting rod pin-and-hole in skirt section below, an auxiliary shirt rim is added on every one side, becomes two auxiliary shirt rims (g37);Described two auxiliary shirt rim, it is containing the concave arc limit on base (g38), lower fillet (g39), side (g40), upper fillet (g41), base(g42), the through hole (g43) of piston and two auxiliary shirt rims, its piston skirt of described piston with the logarithm line of logarithmic differentiation equation alsoClaim isogonal one section to be located at shirt rim, the limit of the part of its shirt rim is that pressure angle is approaching equal to the logarithm spiral shell of logarithmic differentiation equationOne section of line, utilizes the equal feature of logatithmic spiral tool pressure angle of higher mathematics, described wedge turbulent flow is returned and alters sheet (46)Having one section of logatithmic spiral blocks waste gas and returns and alter to reduce in order to utilize equal pressure angle to produce turbulent flow at scavenging road junction placeDischarge; Described two auxiliary shirt rim or with aluminium alloy, or with composite to reduce cylinder prepareding gap; Use CNC machining center, firstMake tungsten copper electrode, with the auxiliary molding of the lathe that has three-dimensional rotation head, then produce in batches with die casting machine; Machined and plating again;Its left block of described left block and right block and right block are respectively provided with and change the little two auxiliary blow vent narrowing, described two auxiliary ventilationIt is just left two auxiliary blow vents (51b) that mouth is located at left block, and it is just right two auxiliary blow vents that described two auxiliary blow vent is located at right block(52b), described left block and right block are to assemble Face to face, and with being connected above of the scavenging air belt of cylinder body, describedThe two auxiliary blow vents (51b) in a left side and described right block that two scavenging air belts of cylinder body are provided with described left block (g51) respectively(g52) the two auxiliary blow vents (52b) in the right side that is provided with are connected, and it is the two auxiliary blow vent of the left and right block that narrows, when described pairWhen the two auxiliary shirt rim (g37) that auxiliary blow vent and the skirt section that runs near plug piston lower dead center are equipped with approaches, be just beneficial to and narrowLocal volume, strengthens local air flow pressure and flow velocity and additional turbulence is returned and altered and fall row; Described narrow the two auxiliary of left and right blockOn the scavenging road junction (g45) of the symmetrical left and right each of blow vent and described cylinder body (g44), respectively each ground, left and right is established symmetricallySome wedge turbulent flows return alters both adapteds of sheet (g46), has the row's of falling effect; The described two auxiliary blow vent that narrows left and right block and instituteBoth adapteds of two auxiliary shirt rim (g37) that the skirt section of the piston of stating is equipped with, have the row's of falling effect; Described narrow the two of left and right blockAuxiliary blow vent, with each each ground, left and right symmetrically on the scavenging road junction (g45) of the symmetrical left and right each of described cylinder body (g44)The wedge turbulent flow being provided with returns alters sheet (g46), and joins with two auxiliary shirt rim (g37) three that the skirt section of described piston is equipped withWith, there is the more row's effect of falling; The left side that the described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided withThe rear wall (51f) of two auxiliary blow vents (51b) is thicker, and thinnest part is no less than 2mm, and has the oblique angle that is greater than 10 degree, so that root moreThick and gain in strength; The described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided with 4 and strengthens arm pawl(51e), and the square-section of each reinforcement arm pawl is thicker, and thinnest part is also no less than 2mm, gains in strength so that cross section is thicker;The back of the body of the two auxiliary blow vents (51b) in a left side that the described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided withNear of face is provided with long reinforcement (51c), presses to gain in strength to resist the larger part of narrowing due to two auxiliary blow ventsPower; The two auxiliary blow vents (51b) in a left side that the described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided withNear at the back side of pit is provided with short reinforcement (51d), narrows larger due to two auxiliary blow vents to gain in strength to resistLocal pressure; The two auxiliary ventilations in the right side that the described right block (g52) of the described two auxiliary blow vents that narrow left and right block is provided withMouth (52b) is pit, about two auxiliary blow vent (51b) phases in a left side that are provided with described left block (g51) of length, width and height of its pitWith, to gain in strength, resist the larger local pressure narrowing due to two auxiliary blow vents; Described narrow the two of left and right blockThe two auxiliary blow vents (52b) in the right side that the described right block (g52) of auxiliary blow vent is provided with are pits, the length, width and height of its pit with described inThe two auxiliary blow vents (51b) in the left side that is provided with of left block (g51) identical, the length, width and height on engine are for being not more than 19x7x4.8mm,Narrow local volume with convenient, strengthen local air flow pressure and flow velocity and additional turbulence is returned and altered and fall row; The waste gas of engineNot directly discharge, but indirectly discharge from the nearly tool bore (28a) of aluminum pipe by after the catalyst hush tube of a meter five; Described cuttingDevice is containing beating the grass the moving head (54) of wire (54b) in order to long-acting cutting with cutting buttress, and disc cutterbar with inner sawtooth (642)(64) in case cutter relieving; With and the carburetor of engine establish four bifurcated nozzles (70a) in order to atomization; And described cutter is establishedThere is the outer protective cover (73) being contained on interior protective cover (60) and on its outer protective cover, be provided with its roller length equal to beat the grass length of diameterGrass pressing wheel (74), so that press grass soil moisture conservation and meadow decorative pattern; The moving head (54) that described cutter is contained with cutThe buttress way that wire (54b) is provided with its multiple sharp swords of multiple sharp swords (54a) of beating the grass is with sharp plain chisel on wireUnder hammering, cut and to pile up neatly, and described wire is round; The moving head (54) that described cutter is contained with cutThe buttress wire (54b) of beating the grass is provided with multiple sharp swords (54a), the way of its multiple sharp swords or on wire with there being sharp edgePlunger chip die under the impact of stamping machine, cut and to pile up neatly, and described wire is flat; The band that described cutter is containedThe outer cutting edge (641) of the periphery of 4 cuttves that stretch out that the disc cutterbar (64) of inner sawtooth (642) is provided with is provided with multiple outer sawsTooth (64a), and described inner sawtooth (642) also has 4, and its every inner sawtooth (642) is established multiple sawtooth; Described cutsThe outer protective cover (73) of installing on the set interior protective cover of cutter (60) is provided with installs draw-in groove (73b) and 2 screw hole positions(73a) in order to installation, and on its outer protective cover (73), be provided with spacing (73c) of beating the grass and restricting, and on its outer protective cover (73)Be provided with grass pressing wheel mounting bar (73d) and arc enclosing bar (73e) for long grass pressing wheel (74) is installed; Its described roller is long etc.Long grass pressing wheel (74) in the diameter of beating the grass is rotating, and to be that roller is long-range be greater than the straight of its grass pressing wheel to the axial length of its grass pressing wheelFootpath, the axial length of its grass pressing wheel is that roller grows to is 3 times of diameter of its grass pressing wheel less; The described diameter of beating the grass refers to describedSpacing (73c) of what its outer protective cover (73) was provided with beat the grass rope is the radius of beating the grass to the distance of cutter rotary middle spindle,Its 2 times are the described diameter of beating the grass; Its roller length of long grass pressing wheel (74) equals to beat the grass diameter just in time the grass energy just having cutBe pressed onto; Its described roller length equal to beat the grass long grass pressing wheel (74) of diameter is rotating and the axial length of its grass pressing wheel is rollerThe long-range diameter that is greater than its grass pressing wheel, the axial length of its grass pressing wheel is 10 times of the long or diameter of its grass pressing wheel of roller or moreMany, so that press grass soil moisture conservation; Its described roller length equal to beat the grass long grass pressing wheel (74) of diameter is provided with the careless groove of multiple pressures(74b), its groove is along its roller length direction or straight groove, or the groove of corrugated bending; And the slot cross-section of the careless groove of described pressure(74a) or square, or semicircular, and the careless groove of described multiple pressure is at least 2, so that press grass soil moisture conservation and meadow pressureDecorative pattern and skidding less; The carburetor of its described engine is established four bifurcated nozzles (70a) and is referred to the nozzle in the inside of carburetor(70) on outlet, establish 4 gaps week along ring and be four bifurcated nozzles (70a), mix the flow-like of combustion vapour through gap to improveState and be beneficial to atomization; The brush cutter of described tool single cylinder half balance and parabola air-foil blade gasoline engine, it is on pistonNear dead point, before the ignition of mixed gas in cylinder above compressed piston, make to open and close owing to moving in piston train of dress portionPreparation air entry in cylinder is opened, and sucks the gaseous mixture of fuel and air in the crankcase below piston; Again due to ignitingThe pressure of the burning gases above the piston producing, piston moves and closes simultaneously air entry from top dead-centre to bottom dead centre direction,Gaseous mixture in compression crankcase, above near piston bottom dead centre, from open and close exhaust outlet make burning gases in cylinder toWhen outdoor gas is discharged, the scavenging path being connected with cylinder by crankcase, on piston in latch-release cylinder by advanceStandby scavenging port imports to the two cycle engine in cylinder by gaseous mixture from crankcase; The design has the valve dress with crankshaft-synchronousPut, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging path is configured to normally closed; At scavenging pathWhen the valve-closing of crankcase side, the gaseous mixture in scavenging path is by the burning that makes it to ignite of the flame of combustion gas, and HC reducesAgain from crankcase to scavenging port, the crankcase side of scavenging path makes it opening later, in the burning of scavenging path with mixing pneumatic transmissionWhen going out, the gaseous mixture in crankcase was closed exhaust outlet before exhaust outlet is discharged from, and Here it is makes the discharge of HC remarkableThe two cycle engine reducing; Solved in former structure, and the valve of above-mentioned bent axle same period is because not being designed, combustion gasAfter the flame of body disappears, scavenging port is not also opened, and the flame of burning gases can make the mixing in scavenging path and crankcaseGas ignition cannot be supplied with gaseous mixture in cylinder, and the opening of exhaust outlet will make the opening of scavenging port cross early stage unlatching, cylinderIn exhaust outlet and scavenging port at the same time when opening, the unblended mixture in crankcase and in scavenging path enters from exhaust outletIn cylinder, so a part for gaseous mixture is discharged from from exhaust outlet under unburned state, become the mixing in Exhaust GasThe problem that gas (being HC) increases; The present invention is outside described air entry exhaust outlet scavenging port, after crankcase scavenging, is sweepingThe crankcase side of gas path has been appended switching valve, and the gaseous mixture in scavenging path is ignited and burnt in the flame of combustion gas,And in scavenging path and crankcase, be that the valve of the synchronizing cycle according to bent axle can be truncated, so the gaseous mixture in crankcase is notCan burning, simultaneously the combustion gas in scavenging path with the valve openings in crankshaft-synchronous cycle in, the mixing in crankcaseGas can be extruded out in cylinder, at exhaust outlet and scavenging port initial stage when opening simultaneously, the burning gases in scavenging pathBe fed in cylinder, the HC that can not adulterate in the exhaust gas being discharged from from exhaust outlet to outside, in the time that exhaust outlet is about to close,The unblended mixture continuing in crankcase in spent gaseous mixture in scavenging path is fed in cylinder, so exhaustThe HC amount of adulterating in gas can be controlled minimizing; Described have and the valve gear of crankshaft-synchronous, is to add bent axle on bent axle (57)The C type circle (56a) of valve (56), the C type circle of described crank valve (56) has the dual-side of a bit of opening to be made as the wedge at oblique angleCircle (56b), when the side that has oblique angle of the dual-side of its a bit of opening is with crankshaft rotating, in the scavenge trunk of latch-release cylinderWhile being communicated with the oral area of crankcase, just there is shearing and reduce the effect of impacting; Described tool single cylinder half balance and parabola air-foil bladeThe brush cutter of gasoline engine, has and the valve gear of crankshaft-synchronous containing described, is the C that adds crank valve (56) on bent axle (57)The dual-side of a bit of opening of type circle (56a) is provided with the pressure coil (56f) of logarithm, when a bit of opening of described pressure coilThe logatithmic spiral side of dual-side is with crankshaft rotating, in the time of the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder, just formsPressure angle equates that the logatithmic spiral of characteristic affects the effect of air-flow and buffering everywhere; The wedge of the noise control filter screen in scavenge trunk(11b) be located at described technique butt strip (55) side; In the scavenge trunk on described technique butt strip (55) side, be provided with touching of reduction of dischargingMatchmaker rolls up (59) its platiniferous rhodium indium iridium, has catalyst effect and noise control to filter regulating and controlling effect to flowing through gas, have the regular hour poor andIsolation and noise elimination regulating action, slow down the discharge of HC to the exhaust outlet of scavenge trunk, adds filter thereby be formed in scavenge trunkThe engine of net; The LPG engine of tool half balance drift angle and parabola mean camber line air-foil blade, has reduction of discharging effect and effect up to standard, itsFilter screen (58) in scavenge trunk is located at technique butt strip (55) side, and separately has filter screen (58) to be located under scavenge trunk; ScavengingThe filter screen of passage is to be formed through knitting device by many wire, and the described filter screen in scavenge trunk has filtration, is located at scavengingIt is the screen cloth scavenging oral area trimmer valve of holding concurrently that described under passage separately has filter screen, and two screen clothes are that filter screen is all between gas in cylinder and crankcaseBreathing has regulating and controlling effect; The brush cutter of described tool single cylinder half balance and parabola air-foil blade gasoline engine is characterized in that, rightThe aerodynamic noise analysis of blade when two-cycle gasoline engine idling, with CFD (computationalfluidDynamics) simulation, its method is intended to computer and carries out " numerical experiment ", reappears physical process from point of theory; In the hope ofReceive numerical simulation has compared with experiment cost is low, data are easily obtained, from point of theory, problem is analyzed advantage withAnd along with the development of computer and model, computing cycle constantly reduces, effect that result of calculation is more and more accurate; To brush cutterFlow field and field of turbulent flow carry out feasibility analysis and data analysis, determine that the blade of brush cutter and Cutting Road are sound source, to brush cutterNoise simulate, the simulation of trend changing for noise is as far as possible realistic, makes every effort to level of noise and experimental error exists10% left and right; Noise source and eddy current crack are made as turbulent boundary layer inner fluid and act on blade and fluid micellar interphase interactionProduce and the disengaging of eddy current, the variation that continuous spectrum random noise is made as flow regime to outlet flow pattern modulation and effluent fluid andAmbient atmos effect produces, and rotational noise is made as fluid and stator and the surrounding fluid effect generation that blade drives, experimental dataCan be relevant with the noise in noise spectrum and demonstration different frequency region, blade of brush cutter rotary air dynamics noise basis frequency meter is calculated publicFormula: F=NZ/60, F is noise fundamental frequency, and N is rotating speed of flail, and Z is blade number; Do progress flow process: geometrical model is set up, calculateMachine simulation, with experimental result contrast, change structure is simulated, and sets up noise model according to analog result, experimental verification; WayBe from blade how much and how much, air channel and rotating speed of flail is started with, set up cutting and blade cad model, non-structured grid ICEM is rawBecome, calculate fluid calculation MRF model in rotating machinery by FLUENT fluid data, consider variable velocity field and pressure field and rapidsKinetic energy, uses LMSVirtuallab software, obtains noise spectrum, analyzes noise source, obtains noise data and carrys out noise reduction; Stable state examinationCalculation parameter arranges: grid is 4120000 non-structured grids and dynamic mesh INTERFACE, and turbulence model is RANS (K-EPSILON), blade rotational speed is got 3000 revs/min, and iterative steps gets 1000; The trial result has vorticity figure, pressure cloud atlas, speed to vowSpirogram, three-dimensional flow line chart, pressure contour surface figure and planar flow line chart, the trial result also has blade cad model to generate non-Structure NetworkLattice, show that important computations result is that engine bush knife speed noise in the time of 5700-7000 rev/min is low; Assistant analysis tool single cylinder half is flatWeighing apparatus and the brush cutter of parabola air-foil blade gasoline engine are further characterized in that its rotating speed is per minute 5750 to 6950 to turn; It is sweptFilter screen (58) in gas passage is 40 object coarse strainers; Under scavenge trunk, be thin by 140 objects and separately there is filter screen (58) to be located atThe filter screen scavenging oral area trimmer valve of holding concurrently; The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine is containing catalyst hush tube(69) muffler ASSY (F7) is arranged on described two-cycle gasoline engine by described silencer pad (F8), described silencerThe exit of assembly (F7), is provided with the inner outlet (F7C2) of interior metal cap (F7C1) nearby, more outer, is provided with outer resin cover at a distance(F7j1) outer vent (F7j2) and log channel (F7j3), so that double-deck cooling is eliminated the noise; Described tool single cylinder half balance and throwingThe brush cutter of thing line air-foil blade gasoline engine is characterized in that: described tool single cylinder half balance and parabola air-foil blade gasoline engineThe magnetic flywheel of brush cutter on contain parabola mean camber line equation air-foil blade; Described magnetic flywheel tapering is 19.92464442Degree, adopts and has the air-foil blade of parabola mean camber line equation, described air-foil blade have a parabolical mean camber lineTool mouldPiece just can be criticized product; While designing the cross sectional shape of air-foil blade, key is the equation of the arc of determining its blade; Getting angle of bend is18 degree, chord length b is 20, a/b=0.45; A is the maximum defluxion point on string bow; The parabola of the origin of coordinates of substitution analytic geometryGeneral equation just can solve and obtain; Middle rank technician can make the die module of wing cross section contour; The outer end of described bladeBe most advanced and sophisticated, be beneficial to and smoothly give vent to anger and reduce disorderly eddy current, and have cutting edge, be beneficial to excision twister; Tool single cylinder half balance and parabolicThe gasoline engine of line mean camber line air-foil blade is characterized in that, adds the opening of C type circle (56a) of crank valve (56) on its bent axle (57)Dual-side to angular bisector and the bent axle center of circle of the central angle in the bent axle center of circle of mouth has between the line of centres in the big end center of circleBalance drift angle (φ), presses type experiment at 2 to 22 degree, the existing 10-18 degree of using.

Update and perfect described tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine, itsBe characterised in that the valve gear that it contains with crankshaft-synchronous is the C type circle (56a) that adds crank valve (56) on bent axle (57)The oral area of the connection crankcase of rotation and the scavenge trunk of latch-release cylinder forms, the outer span of the outer circle of described C type circleFrom the gap (56 δ) between the oral area of the connection crankcase of the scavenge trunk of the cylinder of engine 1E37F at 0.02-0.07 milliRice; Be further characterized in that, described have and the valve gear of crankshaft-synchronous, is the C type that adds crank valve (56) on bent axle (57)The oral area of the connection crankcase of the scavenge trunk of the circle rotation of (56a) and latch-release cylinder forms, described C type circle a bit ofThe dual-side of opening to the central angle in the bent axle center of circle at 82-92 degree. It is characterized in that, it contains the valve dress with crankshaft-synchronousPutting, is on bent axle (57), to add the rotation of C type circle (56a) of crank valve (56) and the connection bent axle of the scavenge trunk of latch-release cylinderThe oral area of case forms, the dual-side of a bit of opening of described C type circle to the central angle in the bent axle center of circle at 84-88 degree; PressContracting is than being not more than 12. It is characterized in that, described have and the valve gear of crankshaft-synchronous, is to add crank valve on bent axle (57)(56) oral area of the connection crankcase of the scavenge trunk of the rotation of C type circle (56a) and latch-release cylinder forms, described bent axle(57) be provided with C type edge (57a) its be corresponding with a bit of opening of the described C type circle (56a) that adds crank valve (56) andRealize cooperation by locating hole. Described have and the valve gear of crankshaft-synchronous, is to add bent axle on bent axle (57)The oral area of the connection crankcase of the scavenge trunk of the rotation of the C type circle (56a) of valve (56) and latch-release cylinder forms, described songAxle (57) is provided with C type edge (57a), and it is corresponding with a bit of opening of the described C type circle (56a) that adds crank valve (56)And by an alignment pin, or a positioning sleeve cooperation, and fix with three screws. There is the valve dress with crankshaft-synchronousPut, be the C type circle (56a) that adds crank valve (56) on bent axle (57), and the C type circle of described crank valve (56) has a bit of openingDual-side or establish the pressure coil (56f) of logarithm line, when the logatithmic spiral side of the dual-side of a bit of opening of described pressure coilWith crankshaft rotating, equate characteristic everywhere with regard to mineralization pressure angle when the oral area of the connection crankcase of the scavenge trunk of latch-release cylinderLogatithmic spiral affects the effect of air-flow and buffering. Valve gear is the C type circle (56a) that adds crank valve (56) on bent axle (57),The C type circle of described crank valve (56) has the dual-side of a bit of opening to be made as the wedge circle (56b) at oblique angle, when described oblique angleSide is with crankshaft rotating, in the time of the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder, just forms shear flow and reduces prominentBecome the effect of impacting.

Update and perfect described tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine, itsBe characterised in that, described have and the valve gear of crankshaft-synchronous, is the C type circle (56a) that adds crank valve (56) on bent axle (57),The C type circle of described crank valve (56) has the dual-side of a bit of opening to be made as the wedge circle (56b) at oblique angle, described crank valve(56) folder of the axis of Yu Mei limit, the oblique angle bent axle that the dual-side of a bit of opening of the wedge circle (56b) of C type circle is provided withAngle is at 15-27 degree, when the side that has oblique angle of the dual-side of a bit of opening of the wedge circle (56b) of described C type circle is with bent axleRotation, in the time of the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder, just forms shear flow and slowly falling that sudden change impactsEffect.

Update and perfect described tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine, itsBe characterised in that, the filter screen (58) in described scavenge trunk is located at described technique butt strip (55) side, and described scavenging is logicalFilter screen (58) in road is located under scavenge trunk; Filter screen in described scavenge trunk is to be formed through knitting device by many wireTwo coarse filtration combination fine filterings buffering valve pockets, to breathing and have filtration regulating and controlling effect between gas in cylinder and crankcase; Many wire warpTwo coarse filtration combination fine filtering buffering valve pockets that knitting device forms are provided with the catalyst volume (59) of reduction of discharging, and its platiniferous, rhodium, indium, to flowing through gasBody has catalyst effect and noise control to filter regulating and controlling effect, has the regular hour postpone poor and isolate and eliminate the noise and obstruct to regulate and doWith, the ingenious discharge that slows down pneumatic noise and HC.

Usefulness is: the brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine is of value to cooling and disappearsSound; Its rotating speed is per minute 5750 to 6950 to turn; Filter screen (58) in its scavenge trunk is 70 object coarse strainers; And separately there is filter screen(58) being located under scavenge trunk is by the 170 object fie screens scavenging oral area trimmer valve of holding concurrently. Its bent axle adds crank valve on (57)(56) dual-side of the opening of C type circle (56a) is to the angular bisector of the central angle in the bent axle center of circle and the bent axle center of circle to big endBetween the line of centres in the center of circle, there is balance drift angle (φ), at 2 to 22 degree; Cutter is established multiple sawtooth, updates and perfectTwo cycle engine has promoted the quality of gardens machines, and solving the former tapering of magnetic flywheel has the problem of axial float, has promoted blade quality,Improve single cylinder half balance.

Brief description of the drawings

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the schematic diagram of brush cutter.

Fig. 2 is the exploded perspective view of the first half of brush cutter.

Fig. 3 is the exploded perspective view of the latter half of brush cutter.

Fig. 4 is the schematic diagram that removes outer cover and protective cover of brush cutter.

Fig. 5 is the exploded perspective view containing engine for brush cutter.

Fig. 6 is the generalized section of the carburetter body containing four bifurcated nozzles (70a) of brush grass-mowing machine engine.

Fig. 7 is the solid signal of the carburetter body containing atomizer of brush grass-mowing machine engine and carburetor assembly (F56)Figure.

Fig. 8 is the schematic perspective view that brush grass-mowing machine is used the disc cutterbar that has inner cutter hole (642) and outer cutting edge (641).

Fig. 9 is the local schematic top plan view that brush grass-mowing machine is used the disc cutterbar that has inner cutter hole (642) and outer cutting edge (641).

Figure 10 is that outer protective cover is provided with its roller length equal to beat the grass schematic perspective view of long grass pressing wheel (74) of diameter.

Figure 11 is the schematic perspective view of the disc cutterbar of the belt length grass pressing wheel of brush grass-mowing machine.

Figure 12 is the stock of brush grass-mowing machine and the schematic perspective view of the disc cutterbar that band is beaten the grass.

Figure 13 is the schematic perspective view of the band of the brush grass-mowing machine disc cutterbar of beating the grass.

Figure 14 is the generalized section of piston.

Figure 15 returns and alters the two solids signals of rushing gasoline engine cylinder that sheet reduction is discharged with scavenging road junction wedge turbulent flowFigure.

Figure 16 returns and alters the two parts amplifications of rushing gasoline engine cylinder that sheet reduction is discharged with scavenging road junction wedge turbulent flowSchematic diagram.

Figure 17 is that the two auxiliary blow vent that narrows left and right block reduces two of discharge and rushes the positive of the left block of petrol engineSchematic diagram.

Figure 18 is the reverse side that the two auxiliary blow vent that narrows left and right block reduces two of discharge and rush the left block of petrol engineSchematic diagram.

Figure 19 two rushes the schematic perspective view of the installation site of the former left and right of petrol engine block.

Figure 20 is the schematic diagram that the two auxiliary blow vent that narrows left and right block reduces two of discharge and rush the right block of petrol engine.

Figure 21 is that the two auxiliary blow vent that narrows left and right block reduces by two receipts of rushing petrolic left and right block of dischargingNarrow two auxiliary blow vent closes on the schematic diagram of the piston that adds two auxiliary shirt rims.

Figure 22 is the midship section that the two auxiliary blow vent that narrows left and right block reduces two of discharge and rush the left block of petrol engineSchematic diagram.

Figure 23 be scavenging road junction cylinder body that technique butt strip (55) is housed the schematic diagram of another angle.

Figure 24 is the schematic diagram that partial cut-out demonstrates the cylinder body of the two-cycle gasoline engine of the layered scavenging in cylinder.

Figure 25 is the schematic diagram that partial cut-out demonstrates the layering gas storage piston of parting face.

Figure 26 is the schematic diagram of the layering gas storage piston of partial cut-out.

Figure 27 is the schematic diagram that partial cut-out demonstrates the layering gas storage piston of parting face.

Figure 28 is the schematic diagram that local crosscut demonstrates the layering gas storage piston that dissects cross section.

Figure 29 is the front elevational schematic of layering gas storage piston.

Figure 30 is the schematic diagram that the complete section of layering gas storage piston is cut cross section.

Figure 31 is the schematic diagram of layering gas storage piston and crankshaft-link rod.

Figure 32 is the schematic diagram that partial cut-out demonstrates the cylinder body of the two-cycle gasoline engine of the layered scavenging in cylinder.

Figure 33 removes butt strip and the schematic diagram that demonstrates the cylinder body of the two-cycle gasoline engine of the layered scavenging in cylinder.

Figure 34 is the schematic diagram of conventional crankshaft-link rod.

Figure 35 adds the bent axle (57) of C type circle (56a) of crank valve (56) and the schematic diagram of connecting rod.

Figure 36 is the schematic diagram that adds the C type circle (56a) of crank valve (56) and the cylinder body of two-cycle gasoline engine.

Figure 37 is the signal that adds the C type circle (56a) of crank valve (56) and the cylinder body of gap (56 δ) and two stroke engineFigure.

Figure 38 is the bent axle (57) that adds crank valve (56) and the generalized section of connecting rod piston.

Figure 39 is the schematic diagram at the C type edge (57a) of the bent axle (57) that adds crank valve (56).

Figure 40 is the schematic diagram that adds the C type circle (56a) of crank valve and the cylinder body of two stroke engine.

Figure 41 is the schematic diagram that adds the wedge circle (56b) of crank valve (56).

Figure 42 is the schematic diagram of the pressure coil (56f) that adds crank valve (56).

Figure 43 is the schematic diagram of the filter screen (58) in scavenge trunk.

Figure 44 is the schematic diagram of the wedge (11b) of the noise abatement in scavenge trunk.

Figure 45 is the schematic diagram of the another side of the wedge (11b) of the noise abatement in scavenge trunk.

Figure 46 is the schematic diagram of the another side of the catalyst volume (59) of the reduction of discharging in scavenge trunk.

Figure 47 is piston stroking upward to the generalized section of putting on scavenging port.

Figure 48 is piston stroking upward to the generalized section of putting under scavenging port.

Figure 49 is the generalized section of piston stroking upward to top dead centre.

Figure 50 is the generalized section of descent of piston in upper position, exhaust outlet top.

Figure 51 is descent of piston to the generalized section of putting on scavenging port.

Figure 52 is the generalized section of piston to lower dead center.

Figure 53 is the generalized section of exhaust close.

Figure 54 is the generalized section of air entry while starting to open.

Figure 55 adds two screen clothes generalized section of two-cycle gasoline engine of scavenging oral area trimmer valve of holding concurrently in scavenge trunk.

Figure 56. be a kind of noise figure of the method for analyzing with computer numerical secondary analog aerodynamic noise.

Figure 57. be the schematic diagram of two cycle engine LPG propane container (t20).

Figure 58. be the schematic diagram of the rear side of two coarse filtration combination fine filtering buffering valve pockets.

Figure 59. be the schematic diagram of two coarse filtration combination fine filtering buffering valve pockets.

Figure 60. be the schematic perspective view dissecing out of the interior metal cap of tool and the double-deck cooling of outer resin cover silencer.

Figure 61. be the generalized section of the interior metal cap of tool and the double-deck cooling of outer resin cover silencer.

Figure 62. be the schematic diagram of magnetic flywheel.

Figure 63. be the cut-away illustration of magnetic flywheel. In figure: 31a. is gas storage pit; 31b. is that the crosscut of gas storage pit is cutd openUpper thread; 1. are two cycle engines; 2. are hexagon socket cap head screw M6x30; 3. are hexagon socket cap head screw M5x8; 4. be 1Type hex nut M6; 5. are PP wire clamps; 6. are PA suspension ring; 7. are 41 type non-metallic insert hexagonal locking nut M5; 8. are POMSuspension ring holder; 9. are hexagon socket cap head screw M5x20; 10. before being, connect aluminum pipeThe 11.th, manipulating handgrip is totalBecome; The 12.th, control handle pipe; 13. is 13 band bullet pad hexagon socket cap head screw M5x25; The 14.th, on handgrip holder, press from both sidesPlate; The 15.th, handgrip holder; The 16.th, left hand handle component; The 17.th, acrylonitrile-butadiene rubber handgrip shock-absorbing sleeve; The 18.th, under handgrip holderClamping plate; The 19.th, left handle pipe; 20. is five leaf nylon tubesThe 21.th, power transmission shaftThe 22.th, zanjon ball journalHold; The 23.th, bullet pad 6; The 24.th, hexagon socket cap head screw M6x23; The 25.th, aluminium tube joint; The 26.th, locking knob; The 27.th, passMoving axis joint; The 28.th, rear aluminum pipe29. is 4 hexagon socket cap head screw M5x12; 30. is 4 spring washers5; The 31.th, spacing handle spring; The 32.th, spacing handle lock; The 33.th, spacing handle; The 34.th, split washer 2.5; The 35.th, protectionCover holder; The 36.th, circlip for hole 26; The 37.th, circlip for shaft 10; The 38.th, small arc-shaped gear; The 39.th, small arc-shapedGear oil is stifled; The 40.th, hexagon socket cap head screw M6x14; The 41.th, hexagon socket cap head screw M6x10; The 42.th, plain washer 6;The 43.th, gear-box; The 44.th, orthodrome gear; The 45.th, splined shaft; The 46.th, deep groove ball bearing 6002; The 47.th, circlip for hole32; The 48.th, gear-box guard shield; The 49.th, spline pad; 50. is 3 tooth disc cutterbars; The 51.th, cutterhead pressing plate; The 52.th, cutterhead guard shield; 53.That 1 type hex nut M10 is left-handed; The 54.th, nylon moving head; 54a. is sharp sword; 54b. cuts to pile up neatly the wire of beating the grass; The 55.th, the back of the bodyBand; The 56.th, hexagon nut with flange M5; The 57.th, small blade; The 58.th, knife rest; The 59.th, cross recessed pan head tapping screw ST4x14;The 60.th, interior protective cover; The 61.th, shielding support; The 62.th, hexagon socket cap head screw M5x35; 63. is 2 tooth disc cutterbars; The 64.th,Disc cutterbar; 65. is 8 tooth disc cutterbars; 16-1. is left hand handle; 16-2. is 1 type hex-head nut M5; 16-3. is cross recess coiled hairScrew M5x20; 16-4. is Cross Recess Head Screw M5x30; The 66.th, there is the waistband of pallet; The 67.th, pallet; The 68.th, auxiliary turningBall; The 69.th, catalyst hush tube; The 70.th, the interior straight tube of atomizer; 70a. is four bifurcated nozzles; The 71.th, there is the spray of spiral fluted vortexOil pipe; The 72.th, atomizer have a parabolical horn mouth; The 73.th, outer protective cover; 73a. is screw hole position; 73b. is installing cardGroove; 73c. is the spacing of rope of beating the grass; 73d. is grass pressing wheel mounting bar; 73e. is arc enclosing bar; The 74.th, long grass pressing wheel; 641.It is outer cutting edge; 64a. is outer sawtooth; The 642.th, inner sawtooth; 74a. is the pressure grass slot cross-section of long roller grass pressing wheel; 74b. is long rollerThe careless groove of multiple pressures of grass pressing wheel; 19b. has the damping of close circle helical spring shape to take over (19b); F1. be starter assembly; F2.To start driver plate assembly; F3. be 2 oil sealings; F4. be right case; F5. be 2 deep groove ball bearings; F6. be 2 moment of torsion 7-9NMInterior hexagonal cylindrical head plain cushion screw assemblies M5 × 45; F7. be the muffler ASSY of contact matchmaker's hush tube (69); F8. be silencerPad; F9. be the right shock-reducing sleeve of fuel tank; F10. be 2 retaining ring for piston pins; F11. be piston pin; F12. be needle bearing; F14. be alivePlug ring; F15. be crank assemblby; F16. be woodruff key; F17. be cylinder block pad; G44. be cylinder block; F19. be 2 interior hexagonalsSocket cap screw assemblies M5 × 20; F20. be engine outer cover; F21. be recessed pan head tapping screw ST5 × 14; F22. be igniterAssembly; F23. be 2 cross fluting screw assemblies M4 × 20; F24. be spark plug; F25. be without asbestos packing sheet mould assembling pad;F26. be 2 mould assembling alignment pins; F27. be left box body; F28. be 5 cross fluting screw assemblies M5 × 25; F29. be that magnetic fliesWheel; F30. be clutch assembly; F31. be clutch disk; F32. be circlip for shaft; F33. be the left shock-absorbing sleeve L of fuel tank(F33); F34. be the right shock-absorbing sleeve R of fuel tank; F35. be inserts bearing connection seat; F36. be 3 crosses fluting screw assemblies M5 ×20; F37 is train wheel bridge shock-absorbing sleeve; F38. be lower plate shock-absorbing sleeve; F39. be train wheel bridge; F40. be lower plate; F41. be in 2Hexagonal cylindrical head screw assemblies M5 × 18; F42. be flame-out wire clamp; F43. be air filter seat; F44. be 2 air filter seat pad covers;F45. be soft polyurethane foam filter core; F46. be air filter pressing plate; F47. be 2 M5 bullet pads; F48. be 2 cross slotted panelsHead plays screw M5 × 63; F49. be air filter lid; F50. be cross fluting coiled hair screw assemblies M5 × 14; F51. be 2 air inletsPipe pad; F52. be deflector; F53. be polyphenylene sulfide PPS air inlet pipe; F54. be grounding wire component; F55. be without asbestos packing sheetOil device pad; F56. be carburetor assembly; F57. be PU yellow transparent oil return pipe; F58. be PU black oil inlet pipe; F59. be oil resistantAcrylonitrile-butadiene rubber oil pipe seat; F60. be fuel filter assembly; F61. be oil pipe clip; F62. be HDPE blowing fuel tank; F63. be oilCase lid assembly; F64. be 5-7NM hexagon-headed bolt plain cushion combination M6X14; F65. be 4 3-5NM cross fluting screw assembliesM5X18; G31. be piston (g31); G37. be two auxiliary shirt rims (g37); G38 is the base (g38) of two auxiliary shirt rims; G39 is lower circleAngle (g39); G40. be the side (g40) of two auxiliary shirt rims; G41. be upper fillet (g41); G42. be the concave arc limit (g42) on base;G43. be the through hole (g43) of piston and two auxiliary shirt rims; G44. be cylinder body (g44); G45. be scavenging road junction (g45); G46. be obliqueWedge turbulent flow returns alters sheet (g46); G47. be that wedge turbulent flow goes back to the scavenging road junction (g47) of altering sheet; G48. be the wedge at logical scavenging road junction(g48); G49. be that the returning of logical scavenging road junction that wedge turbulent flow time is altered sheet altered grid (g49); G50. be the turbulent shield at logical scavenging road junction(g50); 51b is left two auxiliary blow vent (51b); 52b. is right two auxiliary blow vent (52b); G51. be left block; 51b. is left twoAuxiliary blow vent; 51C. is long reinforcement; 51d. is short reinforcement; 51e. strengthens arm pawl; 51f. is rear wall; G52. be right caseSeat; 52b. is right two auxiliary blow vent; 53. is that two air flue walls are also called scavenging air belt partition wall; 53a. is the foot of a wall portion; 53b. is rear wallFace; 53c. is front metope; 53d. is wall end; 53j. is Fourier function breach; The 54.th, the overshoot of tool periodic function gibbs is receivedHold back ripple Fourier sheet wall; 54j. is transition flex point; 54k. is fluctuating convex-concave; 51g. is left prism; 51y. is left straight sided;51h. is left broad side surface; 52g. is right prism; 52y. is right straight sided; 52h. is right broad side surface; 31a. is gas storage pit;31b. is crosscut hatching; 44a. is blow vent; 44b. is into gas port; 44c. is into air scoop; 44d. is the first scavenging port;44f. is the second scavenging port; 44e. is envelope high-wall; The 55.th, technique butt strip; 55g. is that interval is stupefied; 55e. is interval breach; 55d.It is the first scavenging side wall; 55d. is the second scavenging side wall; 44j. connects louvre; 44k. is straight-through louvre; (44x, 44v)To strengthen heat radiation in flakes; The 56.th, crank valve; 56a. is C type circle; The 57.th, bent axle; 56 δ. be gap; 57a. is C type edge;56b. is wedge circle; 56f. is pressure coil; The 58.th, filter screen; The 59.th, catalyst volume; T20. be miniature LPG propane fuel tank; T20c.It is tank base disk; T20d. be the base aperture of tank base disk (t20c); F7C1. be interior metal cap; F7C2. be inner outlet; F7j1.It is outer resin cover; (F7j2). be outer vent; F7j3. be log channel; F29a. blade; F29b. tapering; F29c. keyway.

Detailed description of the invention

For making up the phenomenon that mobile jib trace rocks due to the existing mechanism of brush grass-mowing machine, one provided by the invention is used forThe main aluminium bar of length of the improvement of brush cutter packs in machine as catalyst hush tube, and uses F41 screw fastening; Make waste gas pass through silencerAssembly and catalyst hush tube 69, then by long main aluminium bar, and arrange from gap or the aperture gap of close the cutter of aluminium boom endGo out.

Brush cutter can improve power per liter more than 50% with two stroke engine with respect to four-stroke engine, but in dischargeOn to take measures; Grass-mowing machine is portable dam, wishes that power is gently little; Former stock changes the noise elimination of many honeycombs and catalyst intoPipe, discharges from far-end; Usefulness is to have changed former cause to hover around near people's the engine direct waste gas of putting that runs in, portionPoint waste gas can launched machine carburetor air mouth suction, and the part waste gas situation that can be sucked by people, after catalyst hush tube betweenThe method of putting of running in makes to discharge low and floss hole from a little, safer away from people, and reduces discharging reinforcement; There is transparent protective cover to be more convenient for seeingExamine, the mode of operation of the new pallet waistband of brush cutter is also provided, expand operating radius time, ought run in other words large fillingWood, while reaching treetop, maybe will cut while having puddle to stop at a distance, uses the lengthening mode that engine is put into pallet waistband, makesCutterhead extends, and this is easily more stable operation also. Having transparent protective cover, is on the protective cover of cutter, local transparent or all saturatingBright, can observe better and cut off and operate, reduce jam. There is the bush knife of periphery blade and interior all blades, improved significantlyBrush allow branch and jam. Also have the loosening stock interface that is difficult for of limit flange and lateral filament button, have spiral spring or wave spring and subtractThe handgrip shaking, has the carburetor of inside spin whirlpool nozzle; Promoted the environmental protection of grass-mowing machine with low emission gasoline engine and multinomial measureQuality and usability. Low emission gasoline grass-mowing machine is characterized in that described cutter is containing beating the grass wire 54b's with cutting buttressMoving head 54 is in order to long-acting cutting, and disc cutterbar 64 with inner sawtooth 642 is in case cutter relieving; With and the carburetor of engine establishFour bifurcated nozzle 70a are in order to atomization; And described cutter is provided with interior protective cover 60 and outer protective cover 73 and protection outside itCover is provided with its roller length and equals to beat the grass the long grass pressing wheel 74 of diameter so that press grass soil moisture conservation and meadow decorative pattern, therefore its usefulnessMany.

54 of contained moving heads of the cutter of low emission brush cutter with the buttress wire 54b of beating the grass that cuts be provided with manyIndividual sharp sword 54a, the way of its multiple sharp swords is on wire, to cut to pile up neatly under hammering with sharp plain chisel. Or, cutting54 of contained moving heads of device with the buttress wire 54b of beating the grass that cuts be provided with multiple sharp sword 54a, the way of its multiple sharp swordsOn wire, to cut to pile up neatly under the impact of stamping machine with the plunger chip die that has sharp edge. Cut the buttress wire of beating the grass and compare nylonLine is much more durable; While cutting different object, it is each has something to recommend him that beat the grass wire and disc cutterbar complement each other. The contained band of cutter leans onThe outer cutting edge 641 of the periphery of 4 cuttves that stretch out that the disc cutterbar 64 of interior sawtooth 642 is provided with is provided with multiple outer sawtooth 64a, andDescribed inner sawtooth 642 also has 4, and its every inner sawtooth 642 establishes multiple sawtooth, therefore handy. Cutter is equipped withThe outer protective cover 73 of installing on interior protective cover 60 is provided with installs draw-in groove 73b and 2 screw hole position 73a in order to installation, andIts outer protective cover 73 is provided with the spacing 73c of rope of beating the grass, and on its outer protective cover 73, is provided with for long grass pressing wheel 74 is installedGrass pressing wheel mounting bar 73b and arc enclosing bar 73b, therefore be easy to install. Its 2 times are the described diameter of beating the grass; And the long grass of pressingWheel 74 its roller length diameter that equals to beat the grass just in time can be pressed onto the grass just having cut, therefore press careless successful. Its roller length equals to beat the grassThe long grass pressing wheel 74 of diameter is rotating, and the axial length of its grass pressing wheel is the long-range diameter that is greater than its grass pressing wheel of roller, alsoBe to say, the axial length of its grass pressing wheel is that roller length is 10 times of diameter of its grass pressing wheel, has both been convenient to press grass soil moisture conservation, material-saving again, andIf be conducive to press grass because advancing same distance wheel footpath compared with carefully just rolling several circles more. Wheel too slightly takes material, and what also turn is excessively slow, dashFew, it is poor to roll. Roller length is convenient to cover face, and efficiency is high; So with the grass pressing wheel of thin length. Again because its described roller length equalsThe long grass pressing wheel 74 of diameter of beating the grass is provided with the careless groove 74b of multiple pressures, and its groove is along its roller length direction or straight groove, or waveformBending groove; And the slot cross-section 74a of the careless groove of described pressure or square, or semicircular, therefore be convenient to press grass soil moisture conservation and grassGround embossing and skidding less. Moreover the carburetor of described engine is established bifurcated nozzle 70a and is referred to the spray in the inside of carburetorOn the outlet of mouth 70, establish multiple gaps week along ring and be bifurcated nozzle 70a, mix the flow-like of combustion vapour through gap therefore improvedState and be beneficial to atomization; The carburetor of its described engine establishes that bifurcated nozzle 70a refers at the nozzle 70 of the inside of carburetorOn outlet, establish 4 gaps week along ring and be bifurcated nozzle 70a, be beneficial to mist to improve mixing combustion vapour through the fluid state in gapChange. Or in described carburetor assembly F56, the interior straight tube 70 that improves atomizer is for there being the going out of vortex spray bar of helicla flute 71On mouth pipe, also establish multiple gaps week along ring and be four bifurcated nozzle 70a, or be 3 bifurcateds, or be 5 bifurcateds, or be six bifurcateds, or be7 bifurcateds, or be eight bifurcateds; If 1 gap, or 2 gaps, go out vapour irregular; If more than 9 gap, because of outlet littleIn 3mm, gap is too fine and closely woven. When oily vapour is through the interior straight tube 70 of the improvement atomizer in described carburetor assembly F56 or haveThe import of the vortex spray bar of helicla flute 71 is made as the archimedes curve of parabolical horn mouth 72 or conical sectionHorn mouth pour described interior straight tube 70 and have the vortex spray bar of helicla flute 71, more and then from the outlet of described spray barExtrude to multi-direction dispersion in upper 4 gaps or 3-8 gap of establishing along ring week, instead of only extrude from a hole to a direction,Again due on described outlet along multiple that between multiple gaps of establishing in ring week, form its quiver because cantilever beam principle has back and forthThe vibration of trembling and to the steam flow effect of adding fuel to the flames, will be in the air-breathing moment of gasoline engine, at the aditus laryngis key position of this trunnion,Sharply mixed while handing over atomization and be more conducive to polymerization contaminated product effect and disperse and mix effect at accelerating fluid and the air-flow of coming from air filterReally, enter the two scavenging road junction g45 that rush the symmetrical left and right each of the cylinder body g44 of gasoline engine with the carburetion state of atomization moreIn, then the wedge being provided with through it turbulent flow returns and alters sheet g46 effect and enter two and rush the piston of gasoline engine and the burning that cylinder body formsTherefore chamber is beneficial to week and reciprocally works. The air mass flow coefficient of known carburetor in Reynolds number 8x (1000-100000) scope onlyIn 0.05 left and right, and the discharge coefficient of main jet is that Reynolds number increases and sharply increases with the increase of the aditus laryngis vacuum of this trunnionThereby cause Carburettor performace curve to reduce and make mixture strength be tending towards enriching; Multiple of the aditus laryngis of this trunnion it have pastThe vibration of trembling again is more conducive to accelerate atomization and accelerates carburetion. Narrow the two auxiliary blow vent of left and right block and sweeping of cylinder body g44Wedge that gas port g45 is provided with turbulent flow returns alters sheet g46, and the two auxiliary shirt rim g37 three's adapted being equipped with the skirt section of piston,There is the more row's effect of falling. To collect the crystallization that domestic and foreign experience is groped for many years; There is the reduction of discharging effect up to standard of batch production, not only canReach 50 grams of marks, and can drop to 39.9 grams, safety coefficient is large, and waster is few, and this is significant to large quantities of volume productions. It is in two punchingsThe application of journey engine has been determined and has been started batch product, indicated the developing direction of 20 years low emission gasoline brush cutters from now on. ThisThe bright noise elimination improvement that relates to two cycle engine, has function wave combustion chamber and float electrode collocation, has two auxiliary shirt rims, has scavenging air belt obliqueKey, energy-saving and emission-reduction are up to standard, and multi-functional, its bright spot of LPG engine of tool half balance drift angle and parabola mean camber line air-foil bladeSignificantly; But the invention that the mankind aspire after perfection is endless, repeat not to the utmost in the hope of casting a brick to attract jade therefore weave silk.

With regard to scavenging ventilation, in scavenge trunk, add catalyst volume, add filter screen (58), establish technique butt strip (55), establish multipleWedge (11b), C shape valve etc. style, in two-cycle gasoline engine, has been opened up multiple new ways that can reduce discharging at scavenging air belt, althoughThe mechanism of its atom level needs to be explored future, but its application at two stroke engine scavenging air belt is definite.

A brush cutter for tool single cylinder half balance and parabola air-foil blade gasoline engine, comprises cylinder body and knownCombustion chamber, spark plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, cooling systemSystem, gas handling system, described cylinder body (44) be two-cycle gasoline engine on the cylinder chamber of dress piston along Central Symmetry groundThe cylinder body (44) that contains around each one scavenging road junction (45), is characterized in that: the symmetrical left and right at described cylinder body (44) is eachOne scavenging road junction (45) is upper, and respectively each ground, left and right is provided with wedge turbulent flow and returns and alter sheet (46) symmetrically, in order at scavenging road junction placeProducing turbulent flow blocks waste gas and returns and alter to reduce discharge.

A brush cutter for tool single cylinder half balance and parabola air-foil blade gasoline engine, containing cylinder body and known combustionBurn chamber, spark plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, cooling system,Gas handling system, described cylinder body (44) be two-cycle gasoline engine dress piston cylinder chamber on along Central Symmetry containThe cylinder body (44) at the scavenging road junction (45) of left and right each, is characterized in that: in the symmetrical left and right each of described cylinder body (44)Scavenging road junction (45) is upper, and respectively each ground, left and right is provided with wedge turbulent flow time and alters sheet (46) symmetrically, and its main body is that pressure angle approaches phaseDeng by one section of the logatithmic spiral of logarithmic differentiation equation, utilize the equal feature of logatithmic spiral tool pressure angle of higher mathematics, makeThe turbulent flow of adding returns alters sheet and has a section of logatithmic spiral, gushes mixed air-flow thereon just easily steadily, in order at scavenging road junctionPlace utilizes equal pressure angle to produce turbulent flow to block waste gas and return and alter to reduce discharge.

The wedge turbulent flow of getting the brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine returns the main body of altering sheetOne section, set up differential equation d ρ/d θ=k ρ:

If polar equation ρ=ρ (θ), because wanting pressure angle λ to equate everywhere, therefore tg λ=constant, makes tg λ=k,

By pressure angle formula tg λ=ρ '/ρ,

Just there is ρ '/ρ=k,

Differential it, just have differential equation d ρ/d θ=k ρ.

Solve d ρ/d θ=k ρ, both sides integration after variables separation:

∫ d ρ/ρ=∫ kd θ, because of ρ > 0, is easy to get:

lnρ＝kθ+C，

A is wherein constant, is to be determined by the size of workpiece and mould and the primary condition of CNC lathe.

Adopt PRO/ENGINEERWILDFIRE mapping software, newly establish working directory, newly-built part,

Set up parameter (PARAMETER) 1:C real number (realnumber), can be with composing between 0.01-1 according to concrete operating modeValue, for example 0.3; C is also referred to as wave height.

Set up parameter (PARAMETER) 2:N integer (integer), can be with the concrete operating mode choosing value between 2-100 of certificate, exampleAs 13; N is also referred to as wave number.

Opening relationships (RELATION), equation of the present invention is:

Logarithmic curve:

z＝0

x＝10*t

y＝log(10*t+0.0001)

Make logarithmic curve;

Follow again, adopt rotation, merge, the instructions such as hypostazation, and assemble with workpiece and merge, get final product modeling;

Use described equation and the modeling of PRO/ENGINEERWILDFIRE institute, input CNC machining center, uses againCIMATRO or MASTCAM, the punching block of superzapping cast aluminium alloy, or with milling machine, planer and electrical spark working work are auxiliary; Use electric sparkAdd man-hour, with described equation input CNC machining center, will first make tungsten copper electrode, with the lathe that has three-dimensional rotation head,Produce in batches with die casting machine again; Machined again; Or be welded on piston skirt with the sheet of another system. Logarithmic curve cam, intermediate work shouldMeeting.

With reference to the Ji Bu of the overshoot of the continuous transition of square wave of the Fourier function in the Method of Mathematical Physics of higher mathematicsThe overshoot convergence ripple of this phenomenon and press the approximate single of Fourier function with reference to lag theorem, shifting theorem, convolution theoremCircular frequency and being approximately of launching copy the multiple of frequency spectrum of the decay gradually that fourier series draws to become close from diminishing greatly from dredgingSpike, what mathematical physics was described should be the high level overview of many actual phenomenons, engine scavenging turbulent motion rule is not yetShould make an exception and surmount completely, also should have some similar or inherent relevant or bring out the best in each other and ought more or less use for reference it; At compression modShaping mould core rod on, manufacture to imitate and approach the described Fourier function breach (53j) relevant with the inherence seeming and high-wallThe transition flex point (54j) on top have at least one approach 90 degree turn round shape its to be approximately gibbs overshoot convergence ripple imitative richIn leaf-size class number ground gibbs overshoot phenomenon draw approach gradually rectangle transition ripple and be approximately that imitative fourier series drawsHaving of the frequency spectrum of decaying is gradually multiple from diminishing greatly from dredging the fluctuating convex-concave (54k) of the spike that becomes close; So that the cylinder body spy of mouldingShaped body affects air-flow as mainstay. The having of suitable linear characteristic that have with imitative higher mathematics function and Fourier person's movements and expression drawnLead and transition flex point (54j) and the imitative fourier series on the Fourier function breach (53j) of damping characteristic and the top of high-wallHaving of the frequency spectrum of the decay gradually of drawing is multiple comprehensively high to noise from the fluctuating convex-concave (54k) of the close spike of thin change from diminishing greatlyFrequency band, rate of explosion, compression ratio are favourable.

With reference to the quadratic function curve shape of the equipotentiality streamline of the family of parabolas in the Method of Mathematical Physics of higher mathematics, to pointThe flow direction of many gas storage of layer gas storage piston has directive significance. The outside of described envelope high-wall (44e) is by a side parabolic of scavenging air beltThe equipotentiality streamline of line family, can use CNC digital control processing. Scavenging air belt uses one section of logatithmic spiral also can use CNC digital control processing, logarithm spiral shellLine is the advantage that its tool pressure angle of equiangular spiral equates everywhere, is conducive to the air motion of scavenging air belt. Two scavenging air belt interworkings, theSweep gas port equiangular spiral its tool pressure angle and equate everywhere, and two of the equipotentiality streamline of family of parabolas for the second scavenging road junctionInferior function curve shape, the Method of Mathematical Physics of the imitative higher mathematics in scavenging road junction is R&D direction, testing with high number scientific guidance shouldBetter than blindly gathering together. What mathematical physics was described should be the high level overview of many actual phenomenons, and engine scavenging rule is not yetShould make an exception.

The brush cutter apparatus single cylinder half balance of gardens machine class and parabola air-foil blade gasoline engine, is characterized in that instituteFilter screen (58) in the scavenge trunk of stating is located at described technique butt strip (55) side, and the filter screen in described scavenge trunk is by manyWire forms through knitting device, to breathing and have filtration regulating and controlling effect between gas in cylinder and crankcase; Noise control in scavenge trunkFilter screen is provided with multiple wedges (11b), and described wedge is multiple hollow six prismatics, has aperture on top, the advanced wedge compression of air-flow, thenOverflow and expand from wedge aperture, have noise control to filter regulation and control and noise elimination effect; In the scavenge trunk on technique butt strip (55) sideBe provided with the catalyst volume (59) of reduction of discharging, its platiniferous rhodium indium iridium, has catalyst effect and noise control to filter regulating and controlling effect to flowing through gas, has onePoor and the isolation of fixed time delay and noise elimination effect and obstruct regulating action, the ingenious discharge that slows down pneumatic noise and HC.

The brush cutter of the tool single cylinder half balance of updating and parabola air-foil blade gasoline engine, ad hoc outside its pistonThe gas storage pit (31a) of left and right each, it slightly resembles a pear in shape described gas storage pit, has concentric reducer, less near piston pin axle bed place,It is larger away from piston pin axle bed place, and the crosscut hatching (31b) of described gas storage pit is curve, the crosscut of described gas storage pitThe thickness of the section of hatching (31b) is greater than 2mm, and the curve of the crosscut hatching (31b) of described gas storage pit is family of parabolasEquipotentiality streamline, a section of its streamline is the mediation letter that meets Laplace's equation of imitating the flow function of Method of Mathematical PhysicsThe quadratic function of the family of parabolas of the analytical function of number, is conducive to gas storage scavenging. The equipotentiality streamline of family of parabolas and tool logarithm spiral shellLine there is imitative higher mathematics function have fair line and guiding and a damping characteristic, comprehensively to noise high frequency band, rate of explosion,Compress that when layered scavenging is favourable. The upper top of the second scavenging side wall (55d) of described technique butt strip (55) is family of parabolasQuadratic function curve so that and the outside of described envelope high-wall (44e) by two of the equipotentiality streamline of the family of parabolas of a side of scavenging air beltInferior function curve shape is coexisted and is formed the second scavenging road junction. Or curve is used instead by family of parabolas and logatithmic spiral. Technique butt strip(55) the upper top of the second scavenging side wall (55d) is curve itself and the described envelope high-wall (44e) of tool logatithmic spiral equipotentiality streamlineOutside coexists and forms the second scavenging road junction by the shaped form of the logatithmic spiral equipotentiality streamline of a side of scavenging air belt. Or curve is with throwingWu Xian family equipotentiality streamline, or family of parabolas and logatithmic spiral adapted. Adapted is: the first scavenging side of described technique butt strip (55)The upper top of wall (55d) is that the outside of curve itself and described envelope high-wall (44e) of logatithmic spiral equipotentiality streamline is by a side of scavenging air beltLogatithmic spiral equipotentiality streamline shaped form coexistence and form the first scavenging road junction; Meanwhile, of described technique butt strip (55)The upper top of two scavenging side walls (55d) is that the outside of quadratic function curve itself and described envelope high-wall (44e) of family of parabolas is by scavengingThe quadratic function curve shape of the equipotentiality streamline of the family of parabolas of one side in road is coexisted and is formed the second scavenging road junction in the hope of comprehensively rightThe guide guide effect of gas storage scavenging.

With reference to the quadratic function curve shape of the equipotentiality streamline of the family of parabolas in the Method of Mathematical Physics of higher mathematics, to pointThe flow direction of many gas storage of layer gas storage piston has directive significance. The outside of described envelope high-wall (44e) is by a side parabolic of scavenging air beltThe equipotentiality streamline of line family, can use CNC digital control processing. Scavenging air belt uses one section of logatithmic spiral also can use CNC digital control processing, logarithm spiral shellLine is the advantage that its tool pressure angle of equiangular spiral equates everywhere, is conducive to the air motion of scavenging air belt. Two scavenging air belt interworkings, theSweep gas port equiangular spiral its tool pressure angle and equate everywhere, and two of the equipotentiality streamline of family of parabolas for the second scavenging road junctionInferior function curve shape, the Method of Mathematical Physics of the imitative higher mathematics in scavenging road junction is R&D direction, testing with high number scientific guidance shouldBetter than blindly gathering together. What mathematical physics was described should be the high level overview of many actual phenomenons, and engine scavenging rule is not yetShould make an exception.

Update perfect described tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine, its spyLevy and be: described cylinder body (44) is provided with multiple reinforcement heat radiations (44x, 44v) in flakes between its multiple fin; And described cylinder body(44) be provided with and connect louvre (44j) in the cross-sectional direction of exhaust outlet; And transversal at the air inlet of described cylinder body (44)Face direction is also provided with straight-through louvre (44k), therefore often have improvement in the place of ignoring people.

The present invention relates to energy-saving and emission-reduction, is the brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine, itsCylinder body (44) containing blow vent (44a), enter gas port (44b), the each symmetry in left and right enter air scoop (44c), the each symmetry in left and rightThe first scavenging port (44d), second scavenging port (44f) of the each symmetry in left and right, the outside of the envelope high-wall of sealing is by pistonCylinder and be shaped form by a side of scavenging air belt, and with technique butt strip (55) coexistence of the outer portion at the scavenging road junction of cylinder body, techniqueButt strip (55) is containing interval stupefied (55g), interval breach (55e), the first scavenging side wall (55d), the second scavenging side wall (55d), threeMounting hole site and special-shaped packing, and be formed with the scavenging road junction of cavity, piston (31) is provided with each one gas storage pit around(31a). The equipotentiality streamline of family of parabolas and tool logatithmic spiral there is imitative higher mathematics function have fair line and guiding and a resistanceNit comprehensively to noise high frequency band, rate of explosion, compress that when layered scavenging is favourable.

The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine, its feature is, the present invention is livingBeyond the Great Wall near dead point, before the ignition of mixed gas in cylinder above compressed piston, owing to moving and making in piston train of dress portionPreparation air entry in latch-release cylinder is opened, and sucks the gaseous mixture of fuel and air in the crankcase below piston; Again due toThe pressure of the burning gases above the piston that igniting produces, piston moves from top dead-centre to bottom dead centre direction and closes air-breathing simultaneouslyMouthful, the gaseous mixture in compression crankcase, above near piston bottom dead centre, makes the burning gases in cylinder from opening and closing exhaust outletWhen discharge to outdoor gas, the scavenging path being connected with cylinder by crankcase, on piston in latch-release cylinder byPreparation scavenging port imports to the two cycle engine in cylinder by gaseous mixture from crankcase; The design has the valve dress with crankshaft-synchronousPut, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging path is configured to normally closed; At scavenging pathWhen the valve-closing of crankcase side, the gaseous mixture in scavenging path is by the burning that makes it to ignite of the flame of combustion gas, and HC reducesAgain from crankcase to scavenging port, the crankcase side of scavenging path makes it opening later, in the burning of scavenging path with mixing pneumatic transmissionWhen going out, the gaseous mixture in crankcase was closed exhaust outlet before exhaust outlet is discharged from, and Here it is makes the discharge of HC remarkableThe two cycle engine reducing; Solved in former structure, and the valve of above-mentioned bent axle same period is because not being designed, combustion gasAfter the flame of body disappears, scavenging port is not also opened, and the flame of burning gases can make the mixing in scavenging path and crankcaseGas ignition cannot be supplied with gaseous mixture in cylinder, and the opening of exhaust outlet will make the opening of scavenging port cross early stage unlatching, cylinderIn exhaust outlet and scavenging port at the same time when opening, the unblended mixture in crankcase and in scavenging path enters from exhaust outletIn cylinder, so a part for gaseous mixture is discharged from from exhaust outlet under unburned state, become the mixing in Exhaust GasThe problem that gas (being HC) increases; The present invention is outside described air entry exhaust outlet scavenging port, after crankcase scavenging, is sweepingThe crankcase side of gas path has been appended switching valve, and the gaseous mixture in scavenging path is ignited and burnt in the flame of combustion gas,And in scavenging path and crankcase, be that the valve of the synchronizing cycle according to bent axle can be truncated, so the gaseous mixture in crankcase is notCan burning, simultaneously the combustion gas in scavenging path with the valve openings in crankshaft-synchronous cycle in, the mixing in crankcaseGas can be extruded out in cylinder, at exhaust outlet and scavenging port initial stage when opening simultaneously, the burning gases in scavenging pathBe fed in cylinder, the HC that can not adulterate in the exhaust gas being discharged from from exhaust outlet to outside, in the time that exhaust outlet is about to close,The unblended mixture continuing in crankcase in spent gaseous mixture in scavenging path is fed in cylinder, so exhaustThe HC amount of adulterating in gas can be controlled minimizing. Described have and the valve gear of crankshaft-synchronous, is to add bent axle on bent axle (57)The C type circle (56a) of valve (56), described C type circle has a bit of opening, when a bit of opening of described C type circle is with crankshaft rotating, andThe oral area of the connection crankcase of the scavenge trunk of latch-release cylinder forms, thereby forms arc in tool half balance drift angle and parabolaThe LPG engine of line air-foil blade.

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engine,It is characterized in that, described in have and the valve gear of crankshaft-synchronous, be the C type circle (56a) that adds crank valve (56) on bent axle (57)Rotation and the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder form, the external diameter of the outer circle of described C type circleApart from the gap (56 δ) between the oral area of the connection crankcase of the scavenge trunk of the cylinder of engine 1E39F at 0.02-0.08 milliRice; Be further characterized in that, described have and the valve gear of crankshaft-synchronous, is the C type that adds crank valve (56) on bent axle (57)The oral area of the connection crankcase of the scavenge trunk of the circle rotation of (56a) and latch-release cylinder forms, described C type circle a bit ofThe dual-side of opening to the central angle in the bent axle center of circle at 82-93 degree.

Usefulness of the present invention: be near piston top dead-centre, the gaseous mixture in cylinder above compressed pistonBefore igniting, open owing to moving the preparation air entry making in latch-release cylinder in piston train of dress portion, in the crankcase below pistonSuck the gaseous mixture of fuel and air; Its effect is that exhaust HC amount is reduced; Add two screen clothes scavenging oral area of holding concurrently in scavenge trunk slowRush valve.

Design key is that piston moves and close simultaneously air entry, i.e. piston length and vapour from top dead-centre to bottom dead centre directionIn cylinder, gas port distance matches, and this has expected being just not difficult to arrive at figure subscript, and processing is not also difficult to apply, and its effect is that exhaust HC amount is subtractedFew.

The brush cutter of improved tool single cylinder half balance and parabola air-foil blade gasoline engine described have with bent axle withThe valve gear of step, is the C type circle (56a) that adds crank valve (56) on bent axle (57), and the C type circle of described crank valve (56) has oneThe dual-side of segment opening is made as the wedge circle (56b) at oblique angle, when the side that has oblique angle of the dual-side of its a bit of openingWith crankshaft rotating, in the time of the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder, just form shear flow and reduce sudden change punchingThe effect of hitting, thus described tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine formed.

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engineIt is characterized in that, described have and the valve gear of crankshaft-synchronous, is the C type circle that adds crank valve (56) on bent axle (57)(56a) oral area of the connection crankcase of the scavenge trunk of rotation and latch-release cylinder forms, the outer circle of described C type circleExternal diameter apart from the gap between the oral area of the connection crankcase of the scavenge trunk of the cylinder of engine 1E34F (56 δ) at 0.01-0.06 millimeter; Described have and the valve gear of crankshaft-synchronous, is the C type circle (56a) that adds crank valve (56) on bent axle (57)Rotation and the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder form, a bit of opening of described C type circleDual-side to the central angle in the bent axle center of circle at 79-97 degree; Described have and the valve gear of crankshaft-synchronous, is on bent axle (57)Add the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder forms,Described bent axle (57) is provided with C type edge (57a), and it is and a bit of opening of the described C type circle (56a) that adds crank valve (56)Match.

Further improve perfect described tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine, itsBe characterised in that, described in have and the valve gear of crankshaft-synchronous, be the C type circle (56a) that adds crank valve (56) on bent axle (57)The oral area of the connection crankcase of rotation and the scavenge trunk of latch-release cylinder forms, and described bent axle (57) is provided with C type edge(57a) it is corresponding with a bit of opening of the described C type circle (56a) that adds crank valve (56) and by a locating hole, orAn alignment pin, or positioning sleeve realizes cooperation, and fix with three screws.

Further improve perfect described tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine, itsBe characterised in that, described have and the valve gear of crankshaft-synchronous, is the C type circle (56a) that adds crank valve (56) on bent axle (57),The C type circle of described crank valve (56) has the dual-side of a bit of opening to be made as the wedge circle (56b) at oblique angle, described crank valve(56) folder of the axis of Qi Mei limit, the oblique angle bent axle that the dual-side of a bit of opening of the wedge circle (56b) of C type circle is provided withAngle is at 5-27.5 degree, when the side that has oblique angle of the dual-side of a bit of opening of the wedge circle (56b) of described C type circle is with bent axleRotation, in the time of the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder, just forms shear flow and slowly falling that sudden change impactsEffect.

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engine,It is characterized in that, described in have and the valve gear of crankshaft-synchronous, be the C type circle (56a) that adds crank valve (56) on bent axle (57),The C type circle of described crank valve (56) has the dual-side of a bit of opening to be made as the pressure coil (56f) at oblique angle, when described pressure coilThe logatithmic spiral side of dual-side of a bit of opening with crankshaft rotating, at the connection crankcase of the scavenge trunk of latch-release cylinderOral area time equate that with regard to mineralization pressure angle the logatithmic spiral of characteristic affects the effect of air-flow and buffering everywhere.

Tool single cylinder half balance and the parabola air-foil blade gasoline engine of innovation brush cutter, have reduction of discharging effect, its filter screen(58) be located at technique butt strip (55) side, and separately have filter screen (58) to be located under scavenge trunk; The filter screen of scavenge trunk is by 50The many wire of order form through knitting device, and the described filter screen in scavenge trunk has filtration, be located under scavenge trunk described inSeparately having filter screen is the screen cloth scavenging oral area trimmer valve of holding concurrently, and two screen clothes are that filter screen all has regulation and control to do to breathing between gas in cylinder and crankcaseWith. It is characterized in that, the innovation is near piston top dead-centre, the ignition of mixed gas in cylinder above compressed pistonBefore, open owing to moving the preparation air entry making in latch-release cylinder in piston train of dress portion, in the crankcase below piston, suckThe gaseous mixture of fuel and air; The pressure of burning gases above the piston producing due to igniting again, piston from top dead-centre toDead point direction moves and closes simultaneously air entry, and the gaseous mixture in compression crankcase, above near piston bottom dead centre, from openingWhen closing exhaust outlet burning gases in cylinder are discharged to outdoor gas, the scavenging being connected with cylinder by crankcase is logicalRoad imports to two cycle engine cylinder in by gaseous mixture from crankcase by preparation scavenging port in latch-release cylinder on piston;The design has the valve gear with crankshaft-synchronous, and this valve is from crankcase to cylinder scavenging mouth, the crankcase of scavenging pathSide is configured to normally closed; In the valve-closing of the crankcase side of scavenging path, the gaseous mixture in scavenging path is by burningThe burning that makes it to ignite of the flame of gas, HC is after reducing again from crankcase to scavenging port, and the crankcase side of scavenging path makes it opening,When the burning of scavenging path is sent with gaseous mixture, the row of closing before the gaseous mixture in crankcase is discharged from from exhaust outletGas port, the two cycle engine that Here it is significantly reduces the discharge of HC; Solve in former structure, and above-mentioned bent axle same periodValve because not being designed, after the flame of burning gases disappears, scavenging port is not also opened, the flame meeting of burning gasesMake the gaseous mixture ignition in scavenging path and crankcase, gaseous mixture cannot be supplied with in cylinder, the opening of exhaust outlet will makeThe opening of scavenging port is crossed early stage unlatching, and the exhaust outlet in cylinder and scavenging port be at the same time when opening, in crankcase and scavenging pathIn unblended mixture enter in cylinder from exhaust outlet, so a part for gaseous mixture under unburned state from exhaust outletBe discharged from, become the problem that the gaseous mixture (being HC) in Exhaust Gas increases; The present invention sweeps at described air entry exhaust outletOutside gas port, after crankcase scavenging, append switching valve in the crankcase side of scavenging path, the gaseous mixture in scavenging pathIn the flame of combustion gas, ignite and burn, and in scavenging path and crankcase, being the valve meeting quilt of the synchronizing cycle according to bent axleBlock, thus the gaseous mixture in crankcase can not burn, simultaneously the combustion gas in scavenging path with the gas in crankshaft-synchronous cycleWhen door opening, the gaseous mixture in crankcase can be extruded out in cylinder, at exhaust outlet and scavenging port simultaneously when openingInitial stage, the burning gases in scavenging path are fed in cylinder, in the exhaust gas being discharged from from exhaust outlet to outside notMeeting doping HC, in the time that exhaust outlet is about to close, continues the unburned in crankcase in the spent gaseous mixture in scavenging pathGaseous mixture is fed in cylinder, so the HC adulterating in exhaust gas amount can be controlled minimizing; Described have with crankshaft-synchronousValve gear, is the C type circle (56a) that adds crank valve (56) on bent axle (57), and C type circle has the dual-side of a bit of opening to be made asThere is the wedge circle (56b) at oblique angle, when it has the side at oblique angle with crankshaft rotating, at the connection bent axle of the scavenge trunk of latch-release cylinderWhen the oral area of case, just form and shear and reduce the effect that sudden change is impacted; Described tool single cylinder half balance and parabola air-foil blade vapourThe brush cutter of oil engine, is further characterized in that, described have and the valve gear of crankshaft-synchronous, is to add bent axle on bent axle (57)The dual-side of a bit of opening of the C type circle (56a) of valve (56) is provided with the pressure coil (56f) at oblique angle, when one of described pressure coilThe logatithmic spiral side of the dual-side of segment opening is with crankshaft rotating, at the mouth of the connection crankcase of the scavenge trunk of latch-release cylinderWhen portion, equate that with regard to mineralization pressure angle the logatithmic spiral of characteristic affects the effect of air-flow and buffering everywhere; Filter screen in scavenge trunk(58) wedge (11b) is located at described technique butt strip (55) side; In the scavenge trunk on described technique butt strip (55) side, establishHave the catalyst volume (59) of reduction of discharging, platiniferous rhodium indium iridium, has catalyst effect and noise control to filter regulating and controlling effect to flowing through gas, has certainTime difference and isolation and noise elimination regulating action, slow down the discharge of HC to the exhaust outlet of scavenge trunk, thereby it is logical to be formed on scavengingIn road, add the engine of catalyst; Tool single cylinder half balance and parabola air-foil blade gasoline that further the perfect brush cutter of improvement is used drawThe brush cutter of holding up, is characterized in that, described in have and the valve gear of crankshaft-synchronous, on bent axle (57), add crank valve (56)The oral area of the connection crankcase of the scavenge trunk of the rotation of C type circle (56a) and latch-release cylinder forms, outside described C type circleThe external diameter of circle exists apart from the gap between the oral area of the connection crankcase of the scavenge trunk of the cylinder of engine 1E45F (56 δ)0.02-0.07 millimeter; Be further characterized in that, described have and the valve gear of crankshaft-synchronous, is to add bent axle on bent axle (57)The oral area of the connection crankcase of the scavenge trunk of the rotation of the C type circle (56a) of valve (56) and latch-release cylinder forms, described CThe dual-side of a bit of opening of type circle to the central angle in the bent axle center of circle at 82-92 degree.

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engine,It is characterized in that the valve gear that it contains with crankshaft-synchronous is the C type circle (56a) that adds crank valve (56) on bent axle (57)Rotation and the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder form, a bit of opening of described C type circleDual-side to the central angle in the bent axle center of circle at 83-89 degree.

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engine,It is characterized in that, described have and the valve gear of crankshaft-synchronous, is the C type circle that adds crank valve (56) on bent axle (57)(56a) oral area of the connection crankcase of the scavenge trunk of rotation and latch-release cylinder forms, and described bent axle (57) is provided with CIt is to match with a bit of opening of the described C type circle (56a) that adds crank valve (56) for type edge (57a); Compression ratio is littleIn 11.

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engine,It is characterized in that, described have and the valve gear of crankshaft-synchronous, is the C type circle that adds crank valve (56) on bent axle (57)(56a) oral area of the connection crankcase of the scavenge trunk of rotation and latch-release cylinder forms, and described bent axle (57) is provided with CIt is to match with a bit of opening of the described C type circle (56a) that adds crank valve (56) for type edge (57a).

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engine,It is characterized in that, described have and the valve gear of crankshaft-synchronous, is the C type circle that adds crank valve (56) on bent axle (57)(56a) oral area of the connection crankcase of the scavenge trunk of rotation and latch-release cylinder forms, and described bent axle (57) is provided with CIt is corresponding with a bit of opening of the described C type circle (56a) that adds crank valve (56) and by a location for type edge (57a)Hole, or an alignment pin, or positioning sleeve realizes cooperation, and fix with three screws.

The further described tool single cylinder half balance of Improvement and perfection and the brush cutter of parabola air-foil blade gasoline engine,It is characterized in that, described have and the valve gear of crankshaft-synchronous, is the C type circle that adds crank valve (56) on bent axle (57)(56a), the C type circle of described crank valve (56) has the dual-side of a bit of opening to be made as the wedge circle (56b) at oblique angle, when describedThe side that has oblique angle of the dual-side of a bit of opening of C type circle is with crankshaft rotating, in the connection of the scavenge trunk of latch-release cylinderWhen the oral area of crankcase, just form shear flow and reduce the effect that sudden change is impacted. Two of a bit of opening of wedge circle (56b)The angle of the axis of Qi Mei limit, the oblique angle bent axle that side is provided with is at 5-27.5 degree; Be further characterized in that, described has and bent axleSynchronous valve gear, is the C type circle (56a) that adds crank valve (56) on bent axle (57), and the C type circle of described crank valve (56) hasThe dual-side of a bit of opening is made as the pressure coil (56f) at oblique angle, when the dual-side of a bit of opening of described pressure coilLogatithmic spiral side is with crankshaft rotating, in the time of the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder with regard to mineralization pressure angle placePlace equates that the logatithmic spiral of characteristic affects the effect of air-flow and buffering; Be further characterized in that the filter screen in described scavenge trunk(58) be located at described technique butt strip (55) side, the filter screen in described scavenge trunk be by many wire through knitting device andBecome, to breathing and have filtration regulating and controlling effect between gas in cylinder and crankcase; The wedge (11b) of the noise control filter screen in scavenge trunk is located atDescribed technique butt strip (55) side, the ingenious HC of crankcase virgin gas that slows down is to the discharge of the exhaust outlet of scavenge trunk. ByIt is new technology that the analysis of Computer Numerical Simulation blade aerodynamic noise is used on brush cutter and hay mover.

The method that also computer numerical secondary analog aerodynamic noise on probation is analyzed, uses LMSVirtuallab software,Be easy to learn and use, analyze noise source, obtain noise data and carry out noise reduction; By the method for computer aided animation aerodynamic analysis,The aerodynamic noise analysis of blade when the rotation output of engine is dallied, with CFD (computationalfluidDynamics) simulation, its method is intended to computer and carries out " numerical experiment ", reappears physical process from point of theory; In the hope ofReceive numerical simulation has compared with experiment cost is low, data are easily obtained, from point of theory, problem is analyzed advantage withAnd along with the development of computer and model, computing cycle constantly reduces, effect that result of calculation is more and more accurate; To gardens machineFlow field and field of turbulent flow carry out feasibility analysis and data analysis, determine that the blade of gardens machine and mowing runner are sound source, to gardensThe noise of machine is simulated, and the simulation of trend changing for noise is as far as possible realistic, makes every effort to level of noise and experimental error exists5% left and right; Noise source and eddy current crack are made as turbulent boundary layer inner fluid and act on blade and fluid micellar interphase interactionProduce and the disengaging of eddy current, the variation that continuous spectrum random noise is made as flow regime to outlet flow pattern modulation and effluent fluid andAmbient atmos effect produces, and rotational noise is made as fluid and stator and the surrounding fluid effect generation that blade drives, experimental dataCan be relevant with the noise in noise spectrum and demonstration different frequency region, mower blade rotary air dynamics noise basis frequency meter is calculated publicFormula: F=NZ/60, F is noise fundamental frequency, and N is rotating speed of flail, and Z is blade number; Do progress flow process: geometrical model is set up, calculateMachine simulation, with experimental result contrast, change structure is simulated, and sets up noise model according to analog result, experimental verification; WayBe from blade how much and how much, air channel and rotating speed of flail is started with, set up air channel and blade cad model, non-structured grid ICEM is rawBecome, calculate fluid calculation MRF model in rotating machinery by FLUENT fluid data, consider variable velocity field and pressure field and rapidsKinetic energy, uses LMSVirtuallab software, obtains noise spectrum, analyzes noise source, obtains noise data and carrys out noise reduction; Stable state examinationCalculation parameter arranges: grid is 4120000 non-structured grids and dynamic mesh INTERFACE, and turbulence model is RANS (K-EPSILON), blade rotational speed is got 3000 revs/min, and iterative steps gets 1000; The trial result has vorticity figure, pressure cloud atlas, speed to vowSpirogram, three-dimensional flow line chart, pressure contour surface figure and planar flow line chart, the trial result also has blade cad model to generate non-Structure NetworkLattice, show that important computations result is that machine knife speed noise in the time of 5700-7000 rev/min in engine gardens is low; Described one computerThe gardens that the computer numerical simulation aerodynamic noise of the method that numerical value secondary analog aerodynamic noise is analyzed is analyzedMachine is further characterized in that its blade economic speed is per minute 5790 to 6999 to turn.

Updating and perfect tool single cylinder half balance and the brush cutter of parabola air-foil blade gasoline engine, is driving gardenWoods machine; Fuel gas tank is with LPG fuel gas tank, containing miniature propane fuel tank, before miniature propane fuel tank (t20)Portion is provided with gas thread, and described fuel is entered engine and works, described miniature propane fuel tank through mixed airgun controller by pipe jointFront portion be also provided with safety valve and play safety effect to overflow time in excess of the quota; The tank diameter of described miniature propane fuel tank is less thanBe 98 millimeters, be convenient to change by standard containing 465 grams of propane fuels. Filter screen in scavenge trunk is located at described technique butt strip side,And the filter screen in described scavenge trunk is located under scavenge trunk; The two coarse filtration groups that formed through knitting device by many wireClose fine filtering buffering valve pocket, to breathing and have filtration regulating and controlling effect between gas in cylinder and crankcase; Many wire form through knitting deviceTwo coarse filtration combination fine filterings buffering valve pockets be also provided with the catalyst volume of reduction of discharging, its platiniferous, rhodium, indium, have catalyst effect to flowing through gasSlow down the discharge of pneumatic noise and HC. The LPG engine of tool half balance drift angle and parabola mean camber line air-foil blade, is characterized in that:The described muffler ASSY (F7) containing catalyst hush tube (69) is arranged on described two-stroke by described silencer pad (F8) and drawsHold up, the exit of described muffler ASSY (F7), is provided with the inner outlet (F7C2) of interior metal cap (F7C1) nearby, more outer,Be provided with outer vent (F7j2) and the logarithm runner (F7j3) of outer resin cover (F7j1) at a distance, be convenient to double-deck cooling and eliminate the noise, do not scald peopleHand and security.

The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine is to drive gardens machine; If with combustion gas,Be furnished with LPG fuel gas tank, containing miniature propane fuel tank, the front portion of miniature propane fuel tank (t20) is provided with gas thread, described combustionMaterial is entered engine and works through mixed airgun controller by pipe joint, the front portion of described miniature propane fuel tank be also provided with safety valve withJust when in excess of the quota, overflow and play safety effect; The tank diameter of described miniature propane fuel tank is less than 100 millimeters, containing propane fuel465 grams, be convenient to change by standard. Filter screen in scavenge trunk is located at described technique butt strip side, and described scavenge trunkIn filter screen be located under scavenge trunk; Be the two coarse filtration combination fine filtering buffering valve pockets that formed through knitting device by many wire, rightIn cylinder, between gas and crankcase, breathe and have filtration regulating and controlling effect; Two coarse filtration combination fine filterings that many wire form through knitting device are slowRush the catalyst volume that valve pocket is also provided with reduction of discharging, its platiniferous, rhodium, indium, have catalyst effect to slow down pneumatic noise and HC to flowing through gasDischarge. Muffler ASSY (F7) containing catalyst hush tube (69) is arranged on described two-stroke LPG by described silencer pad (F8)On engine, the exit of described muffler ASSY (F7), is provided with the inner outlet (F7C2) of interior metal cap (F7C1) nearby, then leans on, be provided with outer vent (F7j2) and the logarithm runner (F7j3) of outer resin cover (F7j1) at a distance outward, be convenient to double-deck cooling and eliminate the noise, do not scaldStaff and security. Magnetic flywheel improvement tapering, at 10-20 degree, with the air-foil blade that has parabola equation, forms tool single cylinderThe gasoline engine of half balance and parabola mean camber line air-foil blade. The former tapering of magnetic flywheel is six calibration, is 9.527283381 degree,Have axially and channel bit. Magnetic flywheel improvement tapering, does not axially channel bit and is difficult for crooked to 19 degree with 10 degree. Employing has parabola axisThe air-foil blade of equation, has parabolical equation to be: quadratic equationIn production, make the die module of wing cross section contour and just can criticize product.

The outer end of blade is most advanced and sophisticated, and has cutting edge, is beneficial to excision twister and is beneficial to smoothly to give vent to anger and reduce disorderly eddy current.

The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine, containing catalyst hush tube (69) described in itMuffler ASSY (F7) is arranged on described two-cycle gasoline engine by described silencer pad (F8), described muffler ASSY(F7) exit, is provided with the inner outlet (F7C2) of interior metal cap (F7C1), more outer, is provided with going out of outer resin cover (F7j1)Mouth (F7j2) and logarithm runner (F7j3), so that double-deck cooling is eliminated the noise. In scavenge trunk, establish filter screen, and separately have filter screen to be located at scavengingUnder passage; There is filtration regulating and controlling effect; Also be provided with catalyst. Be convenient to double-deck cooling and eliminate the noise, do not scald staff and security. Solve magnetic flywheel formerTapering has the problem of axial float. While being designed with the cross sectional shape of air-foil blade of parabola mean camber line equation, key is reallyThe equation of the arc of fixed blade; Getting angle of bend is 18 degree, and chord length b is 20, a/b=0.45; A is the maximum defluxion point on string bow;The parabolical general equation of the origin of coordinates of substitution analytic geometry just can solve and obtain. Middle rank technician can make wing cross section wheelThe die module of profile. The outer end of described blade is most advanced and sophisticated, is beneficial to smoothly to give vent to anger and reduce disorderly eddy current, and has cutting edge, is beneficial toExcision twister. The gasoline engine of tool single cylinder half balance and parabola mean camber line air-foil blade is characterized in that, its bent axle (57)On add the C type circle (56a) of crank valve (56) the dual-side of opening to angular bisector and the bent axle center of circle of the central angle in the bent axle center of circleTo there being balance drift angle (φ) between the line of centres in the big end center of circle, at 2 to 22 degree. Update and perfect two-stroke is drawnHold up the quality that has promoted gardens machines, solving the former tapering of magnetic flywheel has the problem of axial float, has promoted blade quality, has improved listCylinder half balance. The LPG engine of tool half balance drift angle and parabola mean camber line air-foil blade, the miniature LPG propane combustion of adapted standardBatch can t20, it is convenient to assembling containing the base aperture t20d of tank base disk t20c and tank base disk t20c. Its bent axle adds on (57)The dual-side of the opening of the C type circle (56a) of crank valve (56) is to the angular bisector of the central angle in the bent axle center of circle and the bent axle center of circle to connectingBetween the line of centres in the bar major part center of circle, there is balance drift angle φ, gather in the actual choosing of 2 to 22 degree, the existing 10-18 degree of using; Simple engineHalf balance method is that the vibration force amplitude of the elliptic equation of making a concerted effort and synthetic tilting moment are reduced, and balance drift angle essence is balance center of gravitySuitably skew, its mechanism is worth the following mankind further to probe in detail.

Claims (10)

1. having a brush cutter of single cylinder half balance and parabola air-foil blade gasoline engine, is the working rig for gardens, containing stock,Cutter, manipulating handgrip assembly, described stock, containing aluminum pipe, is provided with power transmission shaft in the cavity that described aluminum pipe inside is provided with,It is engine that engine is equipped with in its upper end of described aluminum pipe and power transmission shaft, and its lower end of described aluminum pipe and power transmission shaft is equiped with described cuttingDevice, the middle part of described aluminum pipe is equiped with handgrip; The brush cutter machine in described gardens its containing gasoline two cycle engine be engine (1),Hexagon socket cap head screw M6x30 (2), hexagon socket cap head screw M5x8 (3), 3 l type hex nut M6 (4), PP wire clamp(5), PA suspension ring (6), 4 l type non-metallic insert hexagonal locking nut M5 (7), POM suspension ring holder (8), interior hexagonal cylindrical headScrew M5x20 (9), front aluminum pipe (10), manipulating handgrip assembly (11), control handle pipe (12), 13 the interior hexagonals circles of band bullet pads of connecingChapiter screw M5x25 (13), handgrip holder train wheel bridge (14), handgrip holder (15), left hand handle component (16), acrylonitrile-butadiene rubberHandgrip shock-absorbing sleeve (17), handgrip holder lower plate (18), left handle pipe (19), five leaf nylon tubesTransmissionAxleDeep groove ball bearing III (22), bullet pad 6 (23), hexagon socket cap head screw M6x23 (24), aluminium tube joint(25), locking knob (26), shaft adapter (27), rear aluminum pipe(28), 4 hexagon socket cap head screwsM5x12 (29), 4 spring washers 5 (30), spacing handle spring (31), spacing handle lock (32), spacing handle (33), openingBack-up ring 2.5 (34), protective cover holder (35), circlip for hole 26 (36), circlip for shaft 10 (37), small arc-shaped gear(38), stifled (39), hexagon socket cap head screw M6x14 (40) of small arc-shaped gear oil, hexagon socket cap head screw M6x10 (41),Plain washer 6 (42), gear-box (43), orthodrome gear (44), splined shaft (45), deep groove ball bearing 6002I (46), hole bulletProperty back-up ring 32 (47), gear-box guard shield (48), spline pad (49), disc cutterbar containing 3 tooth disc cutterbars (50) or 2 tooth disc cutterbars (63) or4 tooth disc cutterbars (64) or 8 tooth disc cutterbars (65), cutterhead pressing plate (51), cutterhead guard shield (52), M10 is left-handed for l type hex nutOr nylon moving head (54), braces (55), hexagon nut with flange M5 (56), small blade (57), knife rest (58), cross (53)Groove recessed pan head tapping screw ST4x14 (59), protective cover A (60), shielding support (61), hexagon socket cap head screw M5x35(62), left hand is (16-1), l type hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), cross recess coiled hairScrew M5x30 (16-4), the waistband (66) that has pallet (67), auxiliary ball (68), the catalyst hush tube (69) of turning; Described LPG drawsHold up (1), with 1E39F, single cylinder and 39 cylinder diameters and air-cooled, it is containing starter assembly (F1), startup driver plate assembly (F2), 2 oil sealings(F3), hexagonal cylindrical head plain cushion screw assemblies M5 in right case (F4), 2 deep groove ball bearing II (F5), 2 moment of torsion 7-9NM ×45 (F6), containing muffler ASSY (F7), silencer pad (F8), the right shock-reducing sleeve of fuel tank (F9), 2 pistons of catalyst hush tube (69)Pin back-up ring (F10), piston pin (F11), needle bearing (F12), piston (g31), piston ring (F14), crank assemblby (F15), halfRound key (F16), cylinder block pad (F17), cylinder block (F18), 2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19), engineOuter cover (F20), recessed pan head tapping screw ST5 × 14 (F21), igniter assembly (F22), 2 cross fluting screw assemblies M4 × 20(F23), spark plug (F24), without asbestos packing sheet mould assembling pad (F25), 2 mould assembling alignment pins (F26), left box body (F27), 5Cross fluting screw assemblies M5 × 25 (F28), magnetic flywheel (F29), clutch assembly (F30), clutch disk (F31), axle bulletProperty back-up ring (F32), the left shock-absorbing sleeve L of fuel tank (F33), the right shock-absorbing sleeve R of fuel tank (F34), inserts bearing connection seat (F35), 3 crossesFluting screw assemblies M5 × 20 (F36), train wheel bridge shock-absorbing sleeve (F37), lower plate shock-absorbing sleeve (F38), train wheel bridge (F39), lower folderPlate (F40), 2 interior hexagonal cylindrical head screw assemblies M5 × 18 (F41), flame-out wire clamp (F42), air filter seat (F43), 2 skiesFilter seat pad cover (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46), 2 M5 bullet pads (F47), 2 tenWord fluting coiled hair bullet screw M5 × 63 (F48), air filter lid (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50), 2Air inlet pipe pad (F51), deflector (F52), polyphenylene sulfide PPS air inlet pipe (F53), grounding wire component (F54), without asbestos packing sheetOil device pad (F55), carburetor assembly (F56), PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil resistant butadiene-acrylonitrileRubber oil base (F59), fuel filter assembly (F60), oil pipe clip (F61), HDPE blowing fuel tank (F62), cap assembly of fuel tank(F63), 5-7NM hexagon-headed bolt plain cushion combines M6X14 (F64), 4 3-5NM crosses fluting screw assemblies M5X18 (F65), instituteIts two-cycle gasoline engine comprising of the brush cutter of stating, by described hexagon socket cap head screw M6x30 (2), interior hexagonalFillister head screw M5x8 (3) and 3 l type hex nut M6 (4), with described before connect aluminum pipe (10) and be connected; Before described, connectThe outside of the pipe of aluminum pipe (10), by described PP wire clamp (5), PA suspension ring (6), 4 l type non-metallic insert hexagonal locking nut M5(7), POM suspension ring holder (8), hexagon socket cap head screw M5x20 (9) and with braces (55) composition braces part so asBraces is worn on single shoulder; Before described, connecing aluminum pipe (10) upper, be equiped with manipulating handgrip assembly (11), is by controlling handle pipe(12), many band bullet pad hexagon socket cap head screw M5x25 (13), handgrip holder train wheel bridges (14), handgrip holder (15),Left hand handle component (16), acrylonitrile-butadiene rubber handgrip shock-absorbing sleeve (17), handgrip holder lower plate (18), left handle pipe (19) institute are jointlyComposition; Before described, connect the inside of the pipe of aluminum pipe (10), be equiped with five described leaf nylon tubesTransmissionAxleAnd deep groove ball bearing III (22) is so that transmission; Before described, connect aluminum pipe (10) by described bullet pad 6(23), hexagon socket cap head screw M6x23 (24), aluminium tube joint (25), locking knob (26), shaft adapter (27) and instituteThe rear aluminum pipe (28) stated connects, and by 4 hexagon socket cap head screw M5x12 (29), 4 spring washers 5 (30), spacing handHandle spring (31), spacing handle lock (32), spacing handle (33), split washer 2.5 (34) and form spacing Handleset; InstituteThe end of the rear aluminum pipe (28) of stating, is equiped with described protective cover holder (35), circlip for hole 26 (36), axle elasticityBack-up ring 10 (37), small arc-shaped gear (38), small arc-shaped gear oil stifled (39) and many band bullet pad hexagon socket cap head screwsM5x25 (13), hexagon socket cap head screw M6x14 (40), hexagon socket cap head screw M6x10 (41), plain washer 6 (42) andGear-box (43), orthodrome gear (44), splined shaft (45), deep groove ball bearing 6002 (46), circlip for hole 32 (47), toothRoller box guard shield (48), spline pad (49), 3 tooth disc cutterbars (50), cutterhead pressing plate (51), cutterhead guard shield (52); Described cutterContain protective cover and moving head and disc cutterbar to select; Dress described l type hex nut M10 left-handed (53) for cutterhead; OrDress nylon moving head (54) to be to replace disc cutterbar, and the cut-out described small blade (57) that line uses of beating the grass, passes through hexagonal flangeIt is upper that face nut M5 (56), knife rest (58), cross recessed pan head tapping screw ST4x14 (59) are contained in described protective cover A (60), andShielding support (61) and hexagon socket cap head screw M5x35 (62) are installed; Cutterhead can multiselect, or 2 tooth disc cutterbars (63), or4 tooth disc cutterbars (64), or 8 tooth disc cutterbars (65), so that the shrub of different cultivars is cut in choosing; Described left hand handle component (16), byLeft hand is (16-1), l type hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head ScrewM5x30 (16-4) forms, and is arranged in left handle pipe (19); And have the waistband (66) of pallet (67), can tie up to people's waist, holderDish (67) and auxiliary ball (68) movable contact that turns, auxiliaryly turn ball (68) and be connected with engine outer cover (F20), so that further lengtheningCut coverage; Catalyst hush tube (69), connects the gas outlet of muffler ASSY (F7), so that waste gas is through aluminum pipe and near cutterDischarge; The engine start part of described two-cycle gasoline engine comprise starter assembly (F1), start driver plate assembly (F2),Are furnished with 2 oil sealings (F3) and 2 deep groove ball bearing II (F5), to be contained in rotationally the described right case (F4) of engineOn; By hexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6) in 2 moment of torsion 7-9NM, the noise elimination containing catalyst hush tube (69)Device assembly (F7) and silencer pad (F8), be fixed on cylinder block (f18); The right vibration damping of fuel tank is housed on cylinder block (F18)Cover (F9); 2 retaining ring for piston pins (F10), piston pin (F11), needle bearing (F12), piston are housed in cylinder block (F18)(F13), piston ring (F14) and crank assemblby (F15), on bent axle, establish woodruff key (F16); Cylinder block pad (F17) is mounted on cylinderOn body (F18); 2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19) and recessed pan head tapping screw ST5 × 14 (F21) are startingMachine outer cover (F20) is fixed on cylinder block (F18); Igniter assembly (F22) is by 2 cross fluting screw assemblies M4 × 20(F23) fixing; Spark plug (F24) is also contained on cylinder block (F18); On cylinder block (F18), put without asbestos packing sheet mould assembling pad(F25), 2 mould assembling alignment pins (F26), and with the fixing left box body (F27) in 5 crosses fluting screw assemblies M5 × 25 (F28); MagneticFlywheel (F29) is contained on bent axle, and matches with clutch assembly (F30), clutch disk (F31) and circlip for shaft (F32)Close; The right shock-absorbing sleeve R of the left shock-absorbing sleeve L of fuel tank (F33) and fuel tank (F34) is contained on described outer cover (20); Inserts bearing connection seat(F35) fix by 3 cross fluting screw assemblies M5 × 20 (F36); On described connection seat (F35), train wheel bridge is housedShock-absorbing sleeve (F37), lower plate shock-absorbing sleeve (F38) and train wheel bridge (F39) lower plate (F40), and with 2 interior hexagonal cylindrical heads(F41) clamps in screw assemblies M5 × 18; Flame-out wire clamp (F42) is also housed on described connection seat (F35); Air filter seat(F43), 2 air filter seat pad covers (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46) are by 2 M5 bulletsPad (F47) and 2 cross fluting coiled hair bullet screw M5 × 63 (F48) air filter lids (F49), cross fluting coiled hair screw assemblies M5× 14 (F50) forms air filter, and is packed on carburetor; 2 air inlet pipe pads (F51), deflector (F52), polyphenylene sulfide PPS enterTracheae (F53), grounding wire component (F54), without asbestos packing sheet carburetor packing (F55), carburetor assembly (F56) composition carburetionDevice; PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil resistant butadiene-acrylonitrile rubber oil base (F59), fuel filterAssembly (F60), oil pipe clip (F61), HDPE blowing fuel tank (F62), cap assembly of fuel tank (F63) composition fuel tank; And 5-7NM turret headBolt plain cushion combination M6X14 (F64) is fixing described startup driver plate assembly (F2) use, as for 4 3-5NM cross fluting groupsClose screw M5X18 (F65) and be the use of fixing described starter assembly (F1); On the described waistband that has pallet (67) (66)Be provided with pallet (67), on pallet (67), can place the auxiliary ball (68) that turns, and auxiliaryly turn ball (68) and be contained in external engine, or straightConnect brush cutter engine is placed on to the operation that comes up of pallet (67) that waistband (66) is provided with; Pallet (67) is lived with the auxiliary ball (68) that turnsMoving contact, auxiliaryly turns ball (68) and is connected with engine outer cover (F20), to further lengthen cut coverage; Catalyst hush tube(69), one termination is led to the gas outlet of muffler ASSY (F7), before another termination, connects aluminum pipe, so that waste gas aluminium after describedPipe, and discharge near cutter; Described catalyst hush tube (69) is aluminum, has waste gas by there is aluminium dioxide catalyst effectShould; Described muffler ASSY (F7) is aluminum, has waste gas by just there being aluminium dioxide catalyst effect; Before described, connect aluminum pipe(10) and rear aluminum pipe (28) separate, have waste gas by there is aluminium dioxide catalyst effect; In described rear aluminum pipe fiveLeaf nylon tube is established foam honeycomb body, and adds catalyst catalyst at foam honeycomb body, so as to have waste gas by time have that catalyst is polynary urgesChange effect; 2 described tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65), for selecting, are commonly referred to as cutting of cutterCutterhead, it is provided with multiple outer cutting edges (641) in cutterhead periphery, so that the few cutter relieving of brush; Described 2 tooth disc cutterbars (63), 4 teeth cutCutterhead (64), 8 tooth disc cutterbars (65), it is provided with multiple inner cutter holes (642) in cutterhead periphery, so that card branch in brush not; InstituteIn the carburetor assembly (F56) of stating, improve the interior straight tube (70) of atomizer for there being the vortex spray bar of helicla flute (71), be beneficial toDisperse mixed effect; In described carburetor assembly (F56), improve the interior straight tube (70) of atomizer or have helicla flute (71)The import of vortex spray bar is for there being parabolical horn mouth (72), or conical section is as the horn mouth of archimedes curve,Be beneficial to polymerization contaminated product effect; Upper in described left handle pipe (19), (19b) taken in the damping that is provided with close circle helical spring shape,So that further damping; Employing has protective cover transparent or partially transparent (60), in order to convenient observation brush operation; ThisSingle-cylinder air-cooled tool single cylinder half balance and the parabola air-foil blade gasoline engine of small two-stroke that brush cutter adopts, belongs to low rowThe engine of putting, be the combustion chamber that has function wave of the improvement of internal combustion engine and with have active receiving electrode and fine motion discharge electrode inOn the basis of combustion machine with the collocation of igniter, and send out at the gasoline of Jia Shuanfu shirt rim, piston skirt reduction hydrocarbon emissionOn the basis of motivation, and return and alter the petrol engine base that falls row at logarithmic differentiation isogonal line shirt rim, improved piston skirt turbulent flowOn plinth, the further improved two auxiliary blow vent that narrows left and right block reduces two of discharge and rushes petrol engine; In piston skirtAdd two auxiliary shirt rims, have and reduce discharging effect up to standard; Logarithmic differentiation isogonal line shirt rim, piston skirt turbulent flow returns alters the gasoline that falls row and startsMachine is to be equipped with two auxiliary shirt rims (g37) in the skirt section of piston (g31); Described two auxiliary shirt rim (g37) is to retain original pistonThe basis of former two shirt rims of the bilateral that does not have connecting rod pin-and-hole on, and at the bilateral that has connecting rod pin-and-hole in the skirt section of piston (g31)Below, an auxiliary shirt rim is also added on every one side, becomes two auxiliary shirt rims (g37); Described two auxiliary shirt rim, its containing base (g38),The through hole of the concave arc limit (g42) on lower fillet (g39), side (g40), upper fillet (g41), base, two auxiliary shirt rims of piston(g43), piston skirt is located at shirt rim with isogonal a section of logarithmic differentiation equation, and it is conducive to auxiliary guiding, additional turbulenceReturn and alter and fall row, and lubrication assistant and heat radiation; Described two auxiliary shirt rim or with aluminium alloy, or with composite to reduce to join cylinderGap; Each auxiliary shirt rim of described two auxiliary shirt rim (g37) and described former two shirt rims are all the circles along outside piston weekThe prolongation of cylinder, and its projection is thrown on the face vertical with piston movement direction along the outside piston week quartering; DescribedIt is longer that each auxiliary shirt rim of two auxiliary shirt rims (g37) extends along the cylinder in outside piston week than described former two shirt rims,That is to say, the base (g38) of two auxiliary shirt rims is than the base of former two shirt rims distance in the direction of the cylinder extended line along pistonFarther from connecting rod pin-and-hole, two auxiliary shirt rims are higher, and piston and skirt section are longer, and its effect is the guiding length that is conducive to lengthened pistonAnd auxiliary guiding; The both sides of described two auxiliary shirt rim (g37) are provided with the side (g40) of two auxiliary shirt rims, its connect piston (31) andThe base (g38) of two auxiliary shirt rims; The both sides of described two auxiliary shirt rim (g37), are provided with the end that connects piston (31) and two auxiliary shirt rimsThe side (g40) of two auxiliary shirt rims on limit (g38), the angle of the side (g40) of its both sides is greater than 100 degree; Described two auxiliary shirt rim(37) both sides are provided with the side (g40) of two auxiliary shirt rims, and it is to connect work by the upper fillet (g41) of the side of two auxiliary shirt rimsPlug (g31); The both sides of described two auxiliary shirt rim (g37) are provided with the side (g40) of two auxiliary shirt rims, and it is by two auxiliary shirt rimsThe lower fillet (g39) of side connects the base (g38) of two auxiliary shirt rims; On the base of described two auxiliary shirt rim (g37), establish recessedArc limit (g42); Described concave arc limit (g42) or circular arc, or involute, or parabola, fall row in order to assisting; DescribedOn two auxiliary shirt rims (g37), establish through hole (g43), or pit, in order to lubrication assistant and heat radiation; Described two auxiliary shirt rim (g37) upper andPiston is provided with multiple through holes (g43), and it is slightly del arranges, and has many rows, and the most descending through hole is few, and Kong Yue more up worksMany, in order to lubrication assistant and heat radiation; Cylinder body (g44) be two rush petrolic dress piston cylinder chamber on along Central SymmetryGround contains around the cylinder body (g44) at each one scavenging road junction (g45), in the symmetrical left and right each of described cylinder body (g44)On scavenging road junction (g45), each ground, left and right is provided with wedge turbulent flow time and alters sheet (g46) symmetrically, utilizes the logatithmic spiral of higher mathematicsThe feature that tool pressure angle is equal, making described wedge turbulent flow time alter sheet has by one section of the logatithmic spiral of logarithmic differentiation equation,Gush mixed air-flow thereon just easily steadily, in order to utilize at scavenging road junction place equal pressure angle produce turbulent flow block waste gas return alter withReduce discharge; Described wedge turbulent flow returns alters sheet (g46) and is located under the closing on of bottom of the below at the scavenging road junction (g45) of cylinder bodyOne side of the outlet of the scavenging air belt of pressing close to piston of stop, a section of its tool logatithmic spiral; Described wedge turbulent flow returns alters sheet(46) comprise wedge turbulent flow return alter the scavenging road junction (g47) of sheet, wedge (g48) that wedge turbulent flow goes back to the logical scavenging road junction of altering sheet,Wedge turbulent flow time is altered the returning of logical scavenging road junction of sheet and is altered grid (g49), the turbulent turbulent shield that goes back to the logical scavenging road junction of altering sheet of wedge(g50), one section of equal tool logatithmic spiral; Described wedge turbulent flow returns alters sheet (g46) and is slightly inclined wedge-shaped, described inclined wedge-shaped largeEnd is connected to the outlet of the scavenging air belt of pressing close to piston that closes on lower dead center of the bottom of below at the scavenging road junction (g45) of cylinder bodyA side, a section of its tool logatithmic spiral; Described wedge turbulent flow returns alters wedge turbulent flow that sheet (g46) comprises and returns and alter sweeping of sheetGas port (g47) is located at described wedge turbulent flow and goes back to the top of altering sheet (46), that is to say at wedge turbulent flow and returns and alter sheet (g46)One section of its tool logatithmic spiral of the small end of inclined wedge-shaped; Described wedge turbulent flow returns that to alter the described wedge that sheet (g46) comprises disorderlyThe wedge (g48) that flows back to the logical scavenging road junction of altering sheet is located at wedge turbulent flow time and alters the inner side of sheet (g46) and the scavenging air belt with cylinder bodyThe bottom connection of the below of mouthful (g45), a section of its tool logatithmic spiral of described inner side; Described wedge turbulent flow returns alters sheet(g46) the described wedge turbulent flow comprising returns the returning of logical scavenging road junction of altering sheet and alters grid (g49) and be located at wedge turbulent flow and return and alter sheetWith the intersection of a side of the outlet of the scavenging air belt at the scavenging road junction (g45) of cylinder body, a section of its tool logatithmic spiral; Described is obliqueWedge turbulent flow returns alters described wedge turbulent flow that sheet (46) comprises and returns the returning of logical scavenging road junction of altering sheet and alter grid (g49) and be located at wedgeTurbulent flow returns the chamfering place of a side of the outlet of the scavenging air belt at the scavenging road junction (g45) of altering sheet and cylinder body, one of its tool logatithmic spiralSection; Described wedge turbulent flow returns alters described wedge turbulent flow that sheet (g46) comprises and returns the returning of logical scavenging road junction of altering sheet and alter grid(g49) be located at wedge turbulent flow and go back to the rounding place of a side of the outlet of the scavenging air belt at the scavenging road junction (g45) of altering sheet and cylinder body, itsOne section of tool logatithmic spiral; The wedge turbulent flow that is provided with above that described wedge turbulent flow time is altered sheet (g46) returns the logical scavenging air belt of altering sheetThe turbulent shield (g50) of mouth, its one end and the outlet that is located at the turbulent scavenging air belt that goes back to the scavenging road junction (g45) of altering sheet and cylinder body of wedgeThe crossing chamfering place of a side be connected, and its other end and wedge turbulent flow go back to the top of altering sheet and that is to say with wedge turbulent flow time and alterThe small end of the inclined wedge-shaped of sheet (g46) is connected; And described turbulent shield above it also has a section of logatithmic spiral; Narrow left and right caseThe two auxiliary blow vent of seat reduces two of discharge and rushes petrol engine, contain left block, right block, piston and combustion chamber, spark plug,Gray iron, cylinder barrel, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, cooling system, describedCylinder body (g44) be two rush petrolic on the cylinder chamber of dress piston along Central Symmetry contain each one scavenging air belt aroundThe cylinder body (44) of mouthful (g45), upper at the scavenging road junction (g45) of the symmetrical left and right each of described cylinder body (g44), respectively symmetricallyEach ground, left and right is provided with wedge turbulent flow time and alters sheet (g46); The skirt section of described piston is equipped with two auxiliary shirt rims (g37); DescribedTwo auxiliary shirt rims (g37) are on the basis of former two shirt rims of the bilateral that there is not connecting rod pin-and-hole of the original piston of reservation, and at piston(g31) bilateral that has connecting rod pin-and-hole in skirt section below, an auxiliary shirt rim is added on every one side, becomes two auxiliary shirt rims (g37);Described two auxiliary shirt rim, it is containing the concave arc limit on base (g38), lower fillet (g39), side (g40), upper fillet (g41), base(g42), the through hole (g43) of piston and two auxiliary shirt rims, its piston skirt of described piston with the logarithm line of logarithmic differentiation equation alsoClaim isogonal one section to be located at shirt rim, the limit of the part of its shirt rim is that pressure angle is approaching equal to the logarithm spiral shell of logarithmic differentiation equationOne section of line, utilizes the equal feature of logatithmic spiral tool pressure angle of higher mathematics, described wedge turbulent flow is returned and alters sheet (46)Having one section of logatithmic spiral blocks waste gas and returns and alter to reduce in order to utilize equal pressure angle to produce turbulent flow at scavenging road junction placeDischarge; Described two auxiliary shirt rim or with aluminium alloy, or with composite to reduce cylinder prepareding gap; Use CNC machining center, firstMake tungsten copper electrode, with the auxiliary molding of the lathe that has three-dimensional rotation head, then produce in batches with die casting machine; Machined and plating again;Its left block of described left block and right block and right block are respectively provided with and change the little two auxiliary blow vent narrowing, described two auxiliary ventilationIt is just left two auxiliary blow vents (51b) that mouth is located at left block, and it is just right two auxiliary blow vents that described two auxiliary blow vent is located at right block(52b), described left block and right block are to assemble Face to face, and with being connected above of the scavenging air belt of cylinder body, describedThe two auxiliary blow vents (51b) in a left side and described right block that two scavenging air belts of cylinder body are provided with described left block (g51) respectively(g52) the two auxiliary blow vents (52b) in the right side that is provided with are connected, and it is the two auxiliary blow vent of the left and right block that narrows, when described pairWhen the two auxiliary shirt rim (g37) that auxiliary blow vent and the skirt section that runs near plug piston lower dead center are equipped with approaches, be just beneficial to and narrowLocal volume, strengthens local air flow pressure and flow velocity and additional turbulence is returned and altered and fall row; Described narrow the two auxiliary of left and right blockOn the scavenging road junction (945) of the symmetrical left and right each of blow vent and described cylinder body (944), respectively each ground, left and right is established symmetricallySome wedge turbulent flows return alters both adapteds of sheet (g46), has the row's of falling effect; The described two auxiliary blow vent that narrows left and right block and instituteBoth adapteds of two auxiliary shirt rim (g37) that the skirt section of the piston of stating is equipped with, have the row's of falling effect; Described narrow the two of left and right blockAuxiliary blow vent, with each each ground, left and right symmetrically on the scavenging road junction (g45) of the symmetrical left and right each of described cylinder body (g44)The wedge turbulent flow being provided with returns alters sheet (g46), and joins with two auxiliary shirt rim (g37) three that the skirt section of described piston is equipped withWith, there is the more row's effect of falling; The left side that the described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided withThe rear wall (51f) of two auxiliary blow vents (51b) is thicker, and thinnest part is no less than 2mm, and has the oblique angle that is greater than 10 degree, so that root moreThick and gain in strength; The described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided with 4 and strengthens arm pawl(51e), and the square-section of each reinforcement arm pawl is thicker, and thinnest part is also no less than 2mm, gains in strength so that cross section is thicker;The back of the body of the two auxiliary blow vents (51b) in a left side that the described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided withNear of face is provided with long reinforcement (51c), presses to gain in strength to resist the larger part of narrowing due to two auxiliary blow ventsPower; The two auxiliary blow vents (51b) in a left side that the described left block (g51) of the described two auxiliary blow vents that narrow left and right block is provided withNear at the back side of pit is provided with short reinforcement (51d), narrows larger due to two auxiliary blow vents to gain in strength to resistLocal pressure; The two auxiliary ventilations in the right side that the described right block (g52) of the described two auxiliary blow vents that narrow left and right block is provided withMouth (52b) is pit, about two auxiliary blow vent (51b) phases in a left side that are provided with described left block (g51) of length, width and height of its pitWith, to gain in strength, resist the larger local pressure narrowing due to two auxiliary blow vents; Described narrow the two of left and right blockThe two auxiliary blow vents (52b) in the right side that the described right block (g52) of auxiliary blow vent is provided with are pits, the length, width and height of its pit with described inThe two auxiliary blow vents (51b) in the left side that is provided with of left block (g51) identical, the length, width and height on engine are for being not more than 19x7x4.8mm,Narrow local volume with convenient, strengthen local air flow pressure and flow velocity and additional turbulence is returned and altered and fall row; The waste gas of engineNot directly discharge, but indirectly discharge from the nearly tool bore (28a) of aluminum pipe by after the catalyst hush tube of a meter five; Described cuttingDevice is containing beating the grass the moving head (54) of wire (54b) in order to long-acting cutting with cutting buttress, and disc cutterbar with inner sawtooth (642)(64) in case cutter relieving; With and the carburetor of engine establish four bifurcated nozzles (70a) in order to atomization; And described cutter is establishedThere is the outer protective cover (73) being contained on interior protective cover (60) and on its outer protective cover, be provided with its roller length equal to beat the grass length of diameterGrass pressing wheel (74), so that press grass soil moisture conservation and meadow decorative pattern; The moving head (54) that described cutter is contained with cutThe buttress way that wire (54b) is provided with its multiple sharp swords of multiple sharp swords (54a) of beating the grass is with sharp plain chisel on wireUnder hammering, cut and to pile up neatly, and described wire is round; The moving head (54) that described cutter is contained with cutThe buttress wire (54b) of beating the grass is provided with multiple sharp swords (54a), the way of its multiple sharp swords or on wire with there being sharp edgePlunger chip die under the impact of stamping machine, cut and to pile up neatly, and described wire is flat; The band that described cutter is containedThe outer cutting edge (641) of the periphery of 4 cuttves that stretch out that the disc cutterbar (64) of inner sawtooth (642) is provided with is provided with multiple outer sawsTooth (64a), and described inner sawtooth (642) also has 4, and its every inner sawtooth (642) is established multiple sawtooth; Described cutsThe outer protective cover (73) of installing on the set interior protective cover of cutter (60) is provided with installs draw-in groove (73b) and 2 screw hole positions(73a) in order to installation, and on its outer protective cover (73), be provided with spacing (73c) of beating the grass and restricting, and on its outer protective cover (73)Be provided with grass pressing wheel mounting bar (73d) and arc enclosing bar (73e) for long grass pressing wheel (74) is installed; Its described roller is long etc.Long grass pressing wheel (74) in the diameter of beating the grass is rotating, and to be that roller is long-range be greater than the straight of its grass pressing wheel to the axial length of its grass pressing wheelFootpath, the axial length of its grass pressing wheel is that roller grows to is 3 times of diameter of its grass pressing wheel less: the described diameter of beating the grass refers to describedSpacing (73c) of what its outer protective cover (73) was provided with beat the grass rope is the radius of beating the grass to the distance of cutter rotary middle spindle,Its 2 times are the described diameter of beating the grass; Its roller length of long grass pressing wheel (74) equals to beat the grass diameter just in time the grass energy just having cutBe pressed onto; Its described roller length equal to beat the grass long grass pressing wheel (74) of diameter is rotating and the axial length of its grass pressing wheel is rollerThe long-range diameter that is greater than its grass pressing wheel, the axial length of its grass pressing wheel is 10 times of the long or diameter of its grass pressing wheel of roller or moreMany, so that press grass soil moisture conservation; Its described roller length equal to beat the grass long grass pressing wheel (74) of diameter is provided with the careless groove of multiple pressures(74b), its groove is along its roller length direction or straight groove, or the groove of corrugated bending; And the slot cross-section of the careless groove of described pressure(74a) or square, or semicircular, and the careless groove of described multiple pressure is at least 2, so that press grass soil moisture conservation and meadow pressureDecorative pattern and skidding less; The carburetor of its described engine is established four bifurcated nozzles (70a) and is referred to the nozzle in the inside of carburetor(70) on outlet, establish 4 gaps week along ring and be four bifurcated nozzles (70a), mix the flow-like of combustion vapour through gap to improveState and be beneficial to atomization; The brush cutter of described tool single cylinder half balance and parabola air-foil blade gasoline engine, it is on pistonNear dead point, before the ignition of mixed gas in cylinder above compressed piston, make to open and close owing to moving in piston train of dress portionPreparation air entry in cylinder is opened, and sucks the gaseous mixture of fuel and air in the crankcase below piston; Again due to ignitingThe pressure of the burning gases above the piston producing, piston moves and closes simultaneously air entry from top dead-centre to bottom dead centre direction,Gaseous mixture in compression crankcase, above near piston bottom dead centre, from open and close exhaust outlet make burning gases in cylinder toWhen outdoor gas is discharged, the scavenging path being connected with cylinder by crankcase, on piston in latch-release cylinder by advanceStandby scavenging port imports to the two cycle engine in cylinder by gaseous mixture from crankcase; The design has the valve dress with crankshaft-synchronousPut, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging path is configured to normally closed; At scavenging pathWhen the valve-closing of crankcase side, the gaseous mixture in scavenging path is by the burning that makes it to ignite of the flame of combustion gas, and HC reducesAgain from crankcase to scavenging port, the crankcase side of scavenging path makes it opening later, in the burning of scavenging path with mixing pneumatic transmissionWhen going out, the gaseous mixture in crankcase was closed exhaust outlet before exhaust outlet is discharged from, and Here it is makes the discharge of HC remarkableThe two cycle engine reducing; Solved in former structure, and the valve of above-mentioned bent axle same period is because not being designed, combustion gasAfter the flame of body disappears, scavenging port is not also opened, and the flame of burning gases can make the mixing in scavenging path and crankcaseGas ignition cannot be supplied with gaseous mixture in cylinder, and the opening of exhaust outlet will make the opening of scavenging port cross early stage unlatching, cylinderIn exhaust outlet and scavenging port at the same time when opening, the unblended mixture in crankcase and in scavenging path enters from exhaust outletIn cylinder, so a part for gaseous mixture is discharged from from exhaust outlet under unburned state, become the mixing in Exhaust GasThe problem that gas (being HC) increases; The present invention is outside described air entry exhaust outlet scavenging port, after crankcase scavenging, is sweepingThe crankcase side of gas path has been appended switching valve, and the gaseous mixture in scavenging path is ignited and burnt in the flame of combustion gas,And in scavenging path and crankcase, be that the valve of the synchronizing cycle according to bent axle can be truncated, so the gaseous mixture in crankcase is notCan burning, simultaneously the combustion gas in scavenging path with the valve openings in crankshaft-synchronous cycle in, the mixing in crankcaseGas can be extruded out in cylinder, at exhaust outlet and scavenging port initial stage when opening simultaneously, the burning gases in scavenging pathBe fed in cylinder, the HC that can not adulterate in the exhaust gas being discharged from from exhaust outlet to outside, in the time that exhaust outlet is about to close,The unblended mixture continuing in crankcase in spent gaseous mixture in scavenging path is fed in cylinder, so exhaustThe HC amount of adulterating in gas can be controlled minimizing; Described have and the valve gear of crankshaft-synchronous, is to add bent axle on bent axle (57)The C type circle (56a) of valve (56), the C type circle of described crank valve (56) has the dual-side of a bit of opening to be made as the wedge at oblique angleCircle (56b), when the side that has oblique angle of the dual-side of its a bit of opening is with crankshaft rotating, in the scavenge trunk of latch-release cylinderWhile being communicated with the oral area of crankcase, just there is shearing and reduce the effect of impacting; Described tool half balance drift angle and the parabola mean camber line wingThe LPG engine of shape blade, it has and the valve gear of crankshaft-synchronous containing described, adds crank valve (56) on bent axle (57)The dual-side of a bit of opening of C type circle (56a) is provided with the pressure coil (56f) of logarithm, when a bit of opening of described pressure coilThe logatithmic spiral side of dual-side with crankshaft rotating, in the time of the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder with regard to shapeBecome pressure angle to equate that the logatithmic spiral of characteristic affects the effect of air-flow and buffering everywhere; The wedge of the noise control filter screen in scavenge trunk(11b) be located at described technique butt strip (55) side; In the scavenge trunk on described technique butt strip (55) side, be provided with touching of reduction of dischargingMatchmaker rolls up (59) its platiniferous rhodium indium iridium, has catalyst effect and noise control to filter regulating and controlling effect to flowing through gas, have the regular hour poor andIsolation and noise elimination regulating action, slow down the discharge of HC to the exhaust outlet of scavenge trunk, adds filter thereby be formed in scavenge trunkThe engine of net;

The LPG engine of tool half balance drift angle and parabola mean camber line air-foil blade, has reduction of discharging effect and effect up to standard, and its scavenging is logicalFilter screen (58) in road is located at technique butt strip (55) side, and separately has filter screen (58) to be located under scavenge trunk; Scavenge trunkFilter screen is to be formed through knitting device by many wire, and the described filter screen in scavenge trunk has filtration, is located under scavenge trunkDescribed separately to have filter screen be the screen cloth scavenging oral area trimmer valve of holding concurrently, two screen clothes are that filter screen is all to breathing and have between gas in cylinder and crankcaseRegulating and controlling effect; The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine, adopts two-cycle gasoline engine skyThe aerodynamic noise analysis of blade while turning, with CFD (computationalfluiddynamics) simulation, its method is intended toComputer carries out " numerical experiment ", reappears physical process from point of theory; Have in the hope of receiving numerical simulation compared with experimentCost low, data are easily obtained, the advantage problem analyzed from point of theory and the development along with computer and model,Computing cycle constantly reduces, effect that result of calculation is more and more accurate; Flow field to brush cutter and field of turbulent flow carry out feasibility and divideAnalyse and data analysis, determine that the blade of brush cutter and Cutting Road are sound source, the noise of brush cutter is simulated, become for noiseThe simulation of the trend of changing is as far as possible realistic, makes every effort to level of noise and experimental error in 10% left and right; Noise source and eddy current crackBe made as the disengaging that turbulent boundary layer inner fluid acts on blade and fluid micellar interphase interaction generation and eddy current, continuous spectrum withMachine noise is made as the variation of flow regime to outlet flow pattern modulation and effluent fluid and ambient atmos effect generation, and rotational noise is establishedFor fluid and stator and the surrounding fluid effect generation of blade drive, experimental data and noise spectrum and demonstration different frequency regionNoise can be relevant, and blade of brush cutter rotary air dynamics noise basis is computing formula: F=NZ/60 frequently, and F is noise fundamental frequency, and N isRotating speed of flail, Z is blade number; Do progress flow process: geometrical model is set up, computer simulation, with experimental result contrast, changes knotStructure is simulated, and sets up noise model according to analog result, experimental verification; Way is from how much, blade and how much, air channel and cutterSheet rotating speed is started with, and sets up cutting and blade cad model, and non-structured grid ICEM generates, with FLUENT fluid data calculating rotationIn machinery, fluid calculation MRF model, considers variable velocity field and pressure field and tubulence energy, uses LMSVirtuallab software,Obtain noise spectrum, analyze noise source, obtain noise data and carry out noise reduction; Stable state tentative calculation parameter arranges: grid is 4120000 non-knotsNetwork forming lattice and dynamic mesh INTERFACE, turbulence model is RANS (K-EPSILON), blade rotational speed is got 3000 revs/min, iterationStep number gets 1000; The trial result has vorticity figure, pressure cloud atlas, speed vector figure, three-dimensional flow line chart, pressure contour surface figure and planeMotion pattern, the trial result also has blade cad model to generate non-structured grid, show that important computations result is that engine bush knife speed exists5700-7000 rev/min time, noise is low; Its economic speed of brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engineTurn for per minute 5790 to 6990;

Filter screen (58) in its scavenge trunk is 40 object coarse strainers; And separately have filter screen (58) be located under scavenge trunk be byThe 140 object fie screens scavenging oral area trimmer valve of holding concurrently; The brush cutter of tool single cylinder half balance and parabola air-foil blade gasoline engine, itsThe described magnetic flywheel tapering adopting is 19.92464442 degree, adopts the air-foil blade that has parabola equation, described wingThe parabolical equation that has of blade is quadratic equation:

X²+2.63XY+1.73Y²-20X+105Y＝0；

In production, make the die module of wing cross section contour and just can criticize product; Be designed with the wing leaf of parabola equationWhen the cross sectional shape of sheet, key is the equation of the arc of determining its blade; Getting angle of bend is 18 degree, and chord length b is 20, a/b=0.45; A is the maximum defluxion point on string bow; The parabolical general equation of the origin of coordinates of substitution analytic geometry just can solveArrive; Middle rank technician makes the die module of wing cross section contour; The outer end of described blade is most advanced and sophisticated, is beneficial to smoothly to give vent to anger and subtractFew disorderly eddy current, and have cutting edge, be beneficial to excision twister; The brush of tool single cylinder half balance and parabola air-foil blade gasoline engineMachine is characterized in that, adds the dual-side of opening of the C type circle (56a) of crank valve (56) to the circle in the bent axle center of circle on its bent axle (57)The angular bisector at heart angle and the bent axle center of circle are to there being balance drift angle (φ) between the line of centres in the big end center of circle, at 2 to 22 degree, realBorder choosing is gathered, the existing 10-18 degree of using; The half balance method of simple engine is vibration force amplitude and the synthetic tilting moment of the elliptic equation of making a concerted effortSuitably reduce, balance drift angle essence is that balance center of gravity is suitably offset.

2. its feature of brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine existsIn, the valve gear that it contains with crankshaft-synchronous, be on bent axle (57), add crank valve (56) C type circle (56a) rotation andThe oral area of the connection crankcase of the scavenge trunk of latch-release cylinder forms, and the external diameter distance of the outer circle of described C type circle is startedGap (566) between the oral area of the connection crankcase of the scavenge trunk of the cylinder of machine 1E37F is at 0.02-0.07 millimeter; Its spyAlso levy and be, described have and the valve gear of crankshaft-synchronous, is the C type circle (56a) that adds crank valve (56) on bent axle (57)Rotation and the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder form, a bit of opening of described C type circleDual-side to the central angle in the bent axle center of circle at 82-92 degree.

3. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe that the valve gear that it contains with crankshaft-synchronous is the rotation that adds the C type circle (56a) of crank valve (56) on bent axle (57)And the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder forms, the dual-side of a bit of opening of described C type circleTo the central angle in the bent axle center of circle at 84-88 degree.

4. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe, described have and the valve gear of crankshaft-synchronous, is the revolving of C type circle (56a) that adds crank valve (56) on bent axle (57)The oral area of transferring the connection crankcase of the scavenge trunk of latch-release cylinder forms, and described bent axle (57) is provided with C type edge(57a) it is to match with a bit of opening of the described C type circle (56a) that adds crank valve (56); Compression ratio is not more than 12.

5. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe, described have and the valve gear of crankshaft-synchronous, is the revolving of C type circle (56a) that adds crank valve (56) on bent axle (57)The oral area of transferring the connection crankcase of the scavenge trunk of latch-release cylinder forms, and described bent axle (57) is provided with C type edge(57a) it is corresponding and next real by a locating hole with a bit of opening of the described C type circle (56a) that adds crank valve (56)Now coordinate.

6. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe, described have and the valve gear of crankshaft-synchronous, is the revolving of C type circle (56a) that adds crank valve (56) on bent axle (57)The oral area of transferring the connection crankcase of the scavenge trunk of latch-release cylinder forms, and described bent axle (57) is provided with C type edge(57a) it is corresponding with a bit of opening of the described C type circle (56a) that adds crank valve (56) and by an alignment pin, orA positioning sleeve is realized cooperation, and fix with three screws.

7. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe, described have and the valve gear of crankshaft-synchronous, is the C type circle (56a) that adds crank valve (56) on bent axle (57), described inThe C type circle of crank valve (56) has the dual-side of a bit of opening to be made as the pressure coil (56f) at oblique angle, when one of described pressure coilThe logatithmic spiral side of the dual-side of segment opening is with crankshaft rotating, at the mouth of the connection crankcase of the scavenge trunk of latch-release cylinderWhen portion, equate that with regard to mineralization pressure angle the logatithmic spiral of characteristic affects the effect of air-flow and buffering everywhere.

8. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe, described have and the valve gear of crankshaft-synchronous, is the C type circle (56a) that adds crank valve (56) on bent axle (57), described inThe C type circle of crank valve (56) has the dual-side of a bit of opening to be made as the wedge circle (56b) at oblique angle, when one of described C type circleThe side that has oblique angle of the dual-side of segment opening is with crankshaft rotating, at the mouth of the connection crankcase of the scavenge trunk of latch-release cylinderWhen portion, just form shear flow and reduce the effect that sudden change is impacted.

9. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe, described have and the valve gear of crankshaft-synchronous, is the C type circle (56a) that adds crank valve (56) on bent axle (57), described inThe C type circle of crank valve (56) has the dual-side of a bit of opening to be made as the wedge circle (56b) at oblique angle, described crank valve (56)The angle of the axis of Yu Mei limit, the oblique angle bent axle that the dual-side of a bit of opening of the wedge circle (56b) of C type circle is provided with is at 15-27 degree, when the side that has oblique angle of the dual-side of a bit of opening of the wedge circle (56b) of described C type circle is with crankshaft rotating,When the oral area of the connection crankcase of the scavenge trunk of latch-release cylinder, just form shear flow and slowly fall the effect that sudden change is impacted.

10. the brush cutter of tool single cylinder half balance according to claim 1 and parabola air-foil blade gasoline engine, its featureBe, the filter screen (58) in described scavenge trunk is located at described technique butt strip (55) side, and in described scavenge trunkFilter screen (58) be located under scavenge trunk, or set up, or all establish; Filter screen in described scavenge trunk is by many strip metalsTwo coarse filtration combination fine filtering buffering valve pockets that silk forms through knitting device, have the regulation and control of filtration to do to breathing between gas in cylinder and crankcaseWith; Two coarse filtration combination fine filtering buffering valve pockets that many wire form through knitting device are provided with the catalyst volume (59) of reduction of discharging, its platiniferous,Rhodium, indium, have catalyst effect and noise control to filter regulating and controlling effect to flowing through gas, have the regular hour to postpone poor and isolation and eliminate the noise withAnd obstruction regulating action, the ingenious discharge that slows down pneumatic noise and HC.