CN201306207Y - Low discharge two-stroke gasoline engine - Google Patents
Low discharge two-stroke gasoline engine Download PDFInfo
- Publication number
- CN201306207Y CN201306207Y CNU2008201768865U CN200820176886U CN201306207Y CN 201306207 Y CN201306207 Y CN 201306207Y CN U2008201768865 U CNU2008201768865 U CN U2008201768865U CN 200820176886 U CN200820176886 U CN 200820176886U CN 201306207 Y CN201306207 Y CN 201306207Y
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- Prior art keywords
- scavenging
- air belt
- scavenging air
- cylinder
- half crankcase
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a low discharge two-stroke gasoline engine, comprising a cylinder, a piston, a cylinder cavity, a front half crankcase, a rear half crankcase, a crank chamber composed of the front half crankcase and the rear half crankcase, characterized in that a scavenging channel for communicating the crank chamber and the cylinder cavity, symmetrically arranged on the cylinder, having a enclosed structure which is realized by symmetrically arranging end covers on both sides of the cylinder, provided with a gas dividing wall on the scavenging channel for dividing the scavenging channel into a scavenging channel I and a scavenging channel II, is designed to be an angle alpha; simultaneously on the cylinder combination surface of the front half crankcase and the rear half crankcase is provided with throttles which enables the air flow in a downstream scavenging channel to turbulent flow, thereby significantly reducing the content of noxious component (HC+NOx) in tail gas, improving original discharge, effectively reducing fuel consumption rate of the gasoline engine, and improving economic performance.
Description
Technical field
The utility model relates to the technology of gasoline engine field, particularly a kind of Small Universal two-stroke gasoline engine.
Background technique
Two-stroke gasoline engine because have that compact structure, volume are little, light weight, running speed-raising are fast etc., and many remarkable advantages are widely used in many product scopes such as agricultural, forestry, gardening, family.Petrol engine is made up of component such as cylinder body, crankshaft-link rod assembly, moving element, magnetogenerator, Carburetors, is provided with a suction port, a relief opening, two scavenging ports in the tube stem portion of cylinder body, and these gas ports all are to be moved by piston to open or close.A work cycle of petrol engine is to be finished by two strokes of piston motion, and aspirating stroke and exhaust stroke are not set specially.
Rise to when suction port, relief opening, scavenging port all closed at piston, beginning compression work mixed gas simultaneously, forms degree of vacuum in the crankshaft room below piston.When piston continues when up, suction port is opened, and under the atmospheric pressure effect, inflammable mixture enters crankshaft room from Carburetor.Piston is during near top dead center, and spark plug sends electrical spark, lights compressed mixed gas.High temperature and high pressure gas after the burning expands and forces piston to move down.Suction port is closed gradually, and the inflammable mixture that flows into crankshaft room is compressed in advance because of piston moves down.When piston during near lower dead center, exhaust open, waste gas flows into the atmosphere from baffler through relief opening, and the inflammable mixture that is compressed flows in the cylinder from scavenging port, and drives away waste gas, just so-called scavenging.But the inflammable mixture that is used for carrying out scavenging then is easy to mix with gas of combustion, this part inflammable mixture has not just been arranged through burning and has been gone out like this, not only the fuel-economy performance is relatively poor so two-stroke gasoline engine is with respect to four-stroke gasoline engine, and contain a large amount of harmful components, for example HC and CO in the tail gas.Although the therefore discharge capacity of two-stroke gasoline engine and little is significant to the influence of harmful components in the atmospheric pollutant.Existing in addition two-stroke gasoline engine can not satisfy HC (hydrocarbon) index in strict day by day Abgasgesetz, the especially tail gas that administration formulates usually, and the limit value that exceeds Abgasgesetz is a lot.
At present, the method that solves normally reduces HC content in the tail gas by adding catalyzer, yet use catalyzer not only to increase extra cost, also make machine produce overheated problem, therefore reduce original discharging in the tail gas and be that those skilled in the art attempt to capture but the technical barrier of not capturing as yet always because of producing a large amount of heat energy in the catalyst chemical course of reaction.
Summary of the invention
The utility model purpose provides a kind of low-discharge two-stroke gasoline engine, by improvement to cylinder body scavenging air belt structure, make harmful components (HC+NOx) content in the tail gas to reduce significantly, thereby reach the purpose that reduces original discharging, can effectively reduce simultaneously the fuel consumption rate of petrol engine, improve its economic performance; Another object of the present invention is to consider for process aspect, makes to produce to be convenient to the operation realization, reduces manufacture cost.
The technological scheme that the utility model is taked is, a kind of low-discharge two-stroke gasoline engine, comprise cylinder body, piston, the cylinder chamber, preceding half crankcase, later half crankcase, the crankshaft room that forms by front and back half crankcase, it is characterized in that: on cylinder body, be symmetrically arranged with the scavenging air belt that crankshaft room is communicated with the cylinder chamber, described scavenging air belt structure is a closed type structure, this closed type structure is by the bilateral symmetry at cylinder body end cap to be set to realize, and scavenging air belt is provided with the gas partition wall, the gas partition wall is divided into scavenging air belt one and scavenging air belt two with scavenging air belt, scavenging air belt is designed to the α angle, simultaneously at preceding half crankcase, the cylinder junction surface of later half crankcase is provided with the solar term hole.
Said α angle span is between 120 °～150 °.
Scavenging outlet one side at close relief opening of cylinder body is provided with a solar term baffle plate, can reduce the opening area of scavenging outlet one significantly.
Scavenging air belt on the cylinder body is made up of last scavenging air belt and the following scavenging air belt that is positioned on the end cap.
The solar term baffle plate arc length that is provided with on scavenging air belt is about 1/2 of whole scavenging air belt opening arc length.
Working procedure according to the low-discharge two-stroke gasoline engine that the utlity model has said structure is as follows: in the upward stroke of piston, along with the pressure in the crankshaft room reduces, under the effect of atmospheric pressure, mixed gas is drawn into crankshaft room and is retained in wherein from Carburetor.When the mixed gas in the firing chamber, piston top is lighted and when burning, under the promotion of combustion gas, descent of piston, mixed gas in crankshaft room and the scavenging air belt is compressed, and near lower dead center the time, at first is Exhaust Open, when piston continues when descending, the scavenging port that is positioned at the scavenging air belt downstream is opened.In the starting stage of scavenging port opening, the mixed gas that compresses in the crankshaft room rushes at the downstream of scavenging air belt, and is flushed in the cylinder chamber, thus as scavenge flow with certain scavenging angle, from scavenging outlet spray into cylinder body and relief opening over against internal face on.Scavenge flow impacts on the inboard wall of cylinder block face subsequently, and then reflexed from here, thereby waste gas after burning is discharged from relief opening.Scavenging angle [alpha] span among the present invention is between 120 °～150 °, and this is test of many times result's a ideal range, also is the best angle of steering flow towards the ideal orientation development.
The beneficial effects of the utility model are, compare with traditional two-stroke gasoline engine, owing to be arranged on the solar term hole in the crankshaft room, make in the crankshaft room and produce bigger pressure reduction in each scavenging air belt between the downstream, solar term hole that so just causing mixed gas is to spray from this solar term hole jet with very high speed.Near than carrying out solar term the scavenging import to scavenging air belt not situation is provided with pressure and speed that the solar term hole can increase scavenge flow.Scavenge flow be by can expanding sharp behind the solar term hole, thereby when scavenge flow during by scavenging air belt, will form turbulence state in air-flow, and then, the air-flow of turbulent flow attitude sprays and enters the firing chamber from the scavenging outlet.The semi-closed structure of scavenging air belt makes outlet when entering the cylinder body scavenging less than the sectional area of scavenging air belt, has implemented the secondary solar term like this in the process of carrying out scavenging, further increases from the scavenging outlet to flow into airspeed the firing chamber.
When improving airspeed, also promote fuel atomizing, and can improve scavenging efficiency, improved combustion efficiency.Like this, the power output that can obtain to set with fuel consumption still less, and effectively reduced the content of the content of harmful components, particularly HC (hydrocarbon) in the tail gas.Simultaneously, its fuel consumption rate also reduces significantly.
Description of drawings
Fig. 1 is the longitudinal profile view according to two-stroke gasoline engine of the present utility model
Fig. 2 is the cross section view of being done along the A-A line among Fig. 1
Fig. 3 is the schematic representation of cylinder body scavenging air belt along the cylinder body skirt section
Fig. 4 is the partial enlarged view that scavenging air belt and solar term bore portion are done
Fig. 5 is the solar term hole schematic representation on the later half crankcase
Fig. 6 is the solar term hole schematic representation on preceding half crankcase
Fig. 7 is the end cap schematic representation
Fig. 8 is a HC+NOx contrast and experiment in this programme and the prior art two-stroke gasoline engine tail gas
Fig. 9 is this programme and prior art two-stroke gasoline engine fuel consumption rate contrast and experiment
Sequence number explanation in the accompanying drawing: 1. spark plug; 2. firing chamber; 3. cylinder body; 4. radiating fin; 5. scavenging air belt one; 5a. scavenging outlet one; 5b. solar term baffle plate; 6. piston; 7. solar term hole; 8. connecting rod; 9. later half crankcase; 10. starting dial; 11. crankshaft room; 12. preceding half crankcase; 13. bent axle; 14. magnetogenerator; 15. relief opening; 16. suction port; 17. scavenging air belt two; 17a. scavenging outlet two; 18. gas partition wall; 19. tapped hole; 20. cylinder chamber; 21. scavenging air belt; 22. following scavenging air belt; 23. last scavenging air belt; 24. end cap.
Embodiment
As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, according to two-stroke gasoline engine of the present utility model, parts such as the ignition system that the motion assembly that crankshaft room's assembly that scavenging air belt 21, preceding half crankcase 12 and the later half crankcase 9 of comprise cylinder body 3, cylinder chamber 20, being made up of last scavenging air belt 23 on the cylinder body 3 and the following scavenging air belt 22 on the end cap formed, bent axle 13 connecting rods 8 pistons 6 etc. are formed, magnetogenerator 14 spark plugs 1 etc. are formed, Carburetor (not shown), starting dial 10.
Below cylinder body, be crankshaft room's structure: surround crankshaft room 11 by preceding half crankcase 12 and later half crankcase 9, supporting bent axle 13, piston 6 is pumped by a connecting rod 8.
In the upper end of scavenging air belt 1, there is a pair of scavenging to export a 5a and is passed in the cylinder chamber 20.Equally also having a pair of scavenging to export two 17a is passed in the cylinder chamber 20, scavenging exports a 5a and is provided with a solar term baffle plate 5b in the side near relief opening 15, cross section with the upstream section place that is close to solar term baffle plate 5b is compared, and this solar term baffle plate has significantly reduced the opening area of scavenging air belt 1 in the port.Same, scavenging exports two 17a and compares with the outer edge of scavenging air belt 2 17, also significantly tightens, and plays the effect of solar term equally.
Show that as Fig. 5, Fig. 6 preceding half crankcase 12 and later half crankcase 9 are connected on the cylinder body 3 by tapped hole 19 usefulness screws, shown on the plane, with scavenging air belt 1, scavenging air belt 2 17 corresponding positions solar term hole 7 is set.The position in solar term hole 7 and size are to determine like this: envoy's pore 7 is offset with respect to the kernel of section location-appropriate of each scavenging air belt, thereby can generate the swirl shape turbulent flow in scavenge flow; The size in solar term hole 7 should guarantee that sectional area is all less than the sectional area of scavenging air belt 1, scavenging air belt 2 17.Show as Fig. 4, expression piston scavenging schematic representation when top dead center, scavenging exports the sectional area that a 5a, scavenging export two 17a and represents with Sd among the figure, the sectional area of scavenging air belt intermediate section is represented with Sc, the sectional area of the scavenging air belt section of beginning is represented with Sb, the sectional area in the solar term hole on preceding half crankcase 12 and the later half crankcase 9 represents that with Sa the selection of each sectional area should meet following relation: Sa＜Sd＜Sc＜Sb.
The working procedure of two-stroke gasoline engine is as follows:
In the upward stroke of piston 6, along with the pressure in the crankshaft room 11 reduces, under the effect of atmospheric pressure, mixed gas is drawn into crankshaft room 11 and is retained in wherein from Carburetor.When the mixed gas in the firing chamber, piston 6 top 2 is lighted and is burnt, under the promotion of combustion gas, piston 6 is descending, mixed gas in crankshaft room 11 and the scavenging air belt is compressed, near lower dead center the time, at first be that relief opening 15 is opened, further when descending when piston 6, the scavenging port that is positioned at the scavenging air belt downstream is opened.In the starting stage of scavenging port opening, the mixed gas of compression rushes at the downstream of scavenging air belt in the crankshaft room 11, and be flushed in the firing chamber 2, thereby as scavenge flow with certain horizontal scavenging angle, from scavenging outlet spray to cylinder body 3 and relief opening 15 over against internal face on.Scavenge flow impacts on the inboard wall of cylinder block face subsequently, and then reflexed from here, thereby waste gas after burning is discharged from relief opening 15.
Compare with traditional two-stroke gasoline engine, owing to be arranged on the solar term hole 7 on preceding half crankcase 12 and the later half crankcase 9, make to produce bigger pressure reduction in the crankshaft room 11 with between scavenging air belt 1, the scavenging air belt 2 17, so just causing mixed gas is to spray from these solar term hole 7 jets with very high speed.Near than carrying out solar term the scavenging import to scavenging air belt 21 not situation is provided with pressure and speed that solar term hole 7 can increase scavenge flow.Scavenge flow be by can expanding sharp behind the solar term hole 7, thereby when scavenge flow during by scavenging air belt 21, will form turbulence state in air-flow, and then, the air-flow of turbulent flow attitude sprays and enters the cylinder chamber 20 from the scavenging outlet.The semi-closed structure of scavenging air belt makes discharge area Sd when entering the cylinder body scavenging less than the sectional area Sb of scavenging air belt, has implemented the secondary solar term like this in the process of carrying out scavenging, further increases from the scavenging outlet to flow into airspeed the firing chamber.
Discharge capacity according to the foregoing invention design is each 10 (throttle wide, rotating speed 7000r/min) detections under declared working condition of two-stroke gasoline engine of the two-stroke gasoline engine of 42.7CC and the same displacement that prior art designs, result such as Fig. 8, shown in Figure 9: as can be seen from the figure, the two-stroke gasoline engine that HC+NOx content is produced than prior art in its tail gas reduces 60%, and the two-stroke gasoline engine that fuel consumption rate is produced than prior art reduces 30%.
Claims (4)
1, a kind of low-discharge two-stroke gasoline engine, comprise cylinder body (3), piston (6), cylinder chamber (20), preceding half crankcase (12), later half crankcase (9), the crankshaft room (11) that forms by front and back half crankcase, it is characterized in that: on cylinder body (3), be symmetrically arranged with the scavenging air belt (21) that crankshaft room (11) is communicated with cylinder chamber (20), described scavenging air belt (21) structure is a closed type structure, this closed type structure is by the bilateral symmetry at cylinder body (3) end cap (24) to be set to realize, and scavenging air belt (21) is provided with gas partition wall (18), gas partition wall (18) is divided into scavenging air belt one (5) and scavenging air belt two (17) with scavenging air belt (21), scavenging air belt (21) is designed to the α angle, simultaneously at preceding half crankcase (12), the cylinder junction surface of later half crankcase (9) is provided with solar term hole (7).
2, a kind of low-discharge two-stroke gasoline engine according to claim 1 is characterized in that said α angle span is between 120 °～150 °.
3, a kind of low-discharge two-stroke gasoline engine according to claim 1, scavenging outlet one (5a) that it is characterized in that said cylinder body (3) is provided with a solar term baffle plate (5b) in the side near relief opening (15), can reduce the opening area of scavenging outlet one (5a) significantly.
4,, it is characterized in that the scavenging air belt (21) on the said cylinder body (3) is made up of last scavenging air belt (23) and the following scavenging air belt (22) that is positioned on the end cap (24) according to claim 1 or 3 described a kind of low-discharge two-stroke gasoline engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201768865U CN201306207Y (en) | 2008-11-28 | 2008-11-28 | Low discharge two-stroke gasoline engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201768865U CN201306207Y (en) | 2008-11-28 | 2008-11-28 | Low discharge two-stroke gasoline engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201306207Y true CN201306207Y (en) | 2009-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201768865U Expired - Lifetime CN201306207Y (en) | 2008-11-28 | 2008-11-28 | Low discharge two-stroke gasoline engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201306207Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422971A (en) * | 2012-05-14 | 2013-12-04 | 上海山科园林工具有限公司 | Small two-stroke gasoline engine |
-
2008
- 2008-11-28 CN CNU2008201768865U patent/CN201306207Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422971A (en) * | 2012-05-14 | 2013-12-04 | 上海山科园林工具有限公司 | Small two-stroke gasoline engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Linyi City, Luozhuang province Shandong road 276017 No. 1 Patentee after: Shandong Huasheng Pesticide Machinery Co., Ltd. Address before: Linyi City, Luozhuang province Shandong road 276017 No. 1 Patentee before: Shandong Huasheng Pesticide Machinery Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090909 |