CN100482922C

CN100482922C - Internal combustion engine

Info

Publication number: CN100482922C
Application number: CNB2006101261733A
Authority: CN
Inventors: 中沟大和; 三宅丰; 千叶一彦
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2005-08-30
Filing date: 2006-08-29
Publication date: 2009-04-29
Anticipated expiration: 2026-08-29
Also published as: ES2319946A1; JP4509895B2; KR100768376B1; KR20070025977A; JP2007064080A; CN1924305A

Abstract

To provide an internal combustion engine capable of efficiently discharging oil in a crankcase. This internal combustion engine 20 has a cylinder 33 storing a piston 37 in a cylinder chamber 33A, a crankcase 34 rotatably storing a crankshaft 39 in the crankcase 34A communicating with the cylinder chamber 33A, a connecting rod 38 pivotally joined to the piston 37 and the crankshaft 39, and a reed valve 60 arranged in the crankcase 34 and opening and closing in response to pulsation of the crankcase 34A; and is formed for communicating an oil storage chamber 34B formed of the crankcase 34 and storing lubricating oil with the crankcase 34A via the reed valve 60 by forwardly slantingly arranging a cylindrical shaft A of the cylinder chamber 33A in a vehicle 1. The reed valve 60 is arranged under the crankshaft 39, and is positioned and arranged on the opposite side of the cylinder 33 to a vertical line from the crankshaft 39.

Description

Internal-combustion engine

Technical field

The present invention relates to lean forward internal-combustion engine on the vehicles such as being loaded in motorcycle of a kind of Cylindorical rod, more particularly, relate to the internal-combustion engine that a kind of accumulator that is used to store lubricant oil is communicated with by leaf valve and crankshaft room cylinder chamber.

Background technique

As above-mentioned internal-combustion engine, make the crankshaft room that holds bent axle that forms in the inside of crankcase airtight, just so-called is known with the lubricated internal-combustion engine of airtight bent axle mode.In this internal-combustion engine, the accumulator that stores lubricant oil is formed on the outside of the crankshaft room that holds bent axle.

In addition, leaf valve and the crankshaft room of accumulator by being located at crankcase is communicated with, and leaf valve is with piston reciprocatingly slide in the cylinder pulsation of the crankcase that produces and switch.Lubricant oil in the crankshaft room is along with the rotation of bent axle is gathered near leaf valve, and leaf valve one is opened, and lubricant oil just is recycled to accumulator (for example, with reference to patent documentation 1).

Patent documentation 1: the spy opens communique 2004-No. 60451

Shown in patent documentation 1, current leaf valve all is located at the vertical lower of bent axle, the disc that lubricant oil in the crankshaft room is rotated etc. scrapes, collide with the internal face of the crankcase that forms crankshaft room, afterwards by this internal face or the guiding groove that internal face forms transmit be collected at leaf valve near.But under this form, there is the problem that to gather lubricant oil fast, need seeks a kind of structure that expeditiously lubricant oil is discharged to the accumulator side from crankshaft room's side.

Summary of the invention

In view of above problem and situation, the objective of the invention is to, a kind of internal-combustion engine that can expeditiously the lubricant oil in the crankshaft room be discharged is provided.

For achieving the above object, the invention provides a kind of internal-combustion engine, its structure comprises: cylinder, and it has cylinder chamber, accommodates the piston that is free to slide in this cylinder chamber; Crankcase, it has with cylinder and combines, and in the inner crankshaft room that is communicated with cylinder chamber, accommodates in this crankshaft room and rotates bent axle freely; Connecting rod, it is pivotally connected on piston and the bent axle; Leaf valve, it is located at crankcase, the switch along with the pulsation of crankshaft room; The Cylindorical rod of cylinder chamber leaned forward be disposed on the vehicle, form by crankcase, being used to store lubricated accumulator with lubricant oil is communicated with by leaf valve and crankshaft room, wherein, leaf valve is located at the bent axle below, simultaneously it is located at a vertical line side opposite of relative bent axle, crankshaft room and accumulator are communicated with via the access that is formed in the crankcase with cylinder, leaf valve is located on this access, and the Cylindorical rod almost parallel of the relative cylinder chamber of access is extended the ground setting.In addition, the top that is preferably in leaf valve be formed on leaf valve open before the valve during the oily storage area of temporary transient oil in reserve, leaf valve is disposed for vertically downward mode with valve opening position.In addition, crankcase is to form engaging along the mutual mating face of first and second case halfbody of axially cutting apart of bent axle, preferably leaf valve is accommodated in the container on a mating face being located at this first and second case halfbody, and is kept by crankcase.

In addition, by constituting bent axle, preferably leaf valve is configured to overlap Vertical direction and one of a pair of disc portion and at least one side in the connecting rod tip portion in the collar of crankcase internal support bent axle, the pin portion that is connected with collar to a pair of disc portion of extending with the axle orthogonal direction and the big end that is connected connecting rod of between a pair of disc portion, extending vertically.And, also cylinder can be set as single-cylinder, configuration overlaps configuration with this oil suction portion at another of Vertical direction and above-mentioned a pair of disc portion at least a portion of the oil suction portion of the lubricant oil supply system of vehicle each several part supplying lubricating oil in accumulator.

In the internal-combustion engine of the present invention that constitutes like this, the Cylindorical rod of cylinder chamber is set as and leans forward, when piston from top dead center when lower dead center is slided (moving down), connecting rod tip portion (with the pin-joint part of bent axle) is a rotating center with the axle center of bent axle, and relatively the vertical line of bent axle is drawn arc downwards and bent axle rotates simultaneously from cylinder one side direction opposition side.In addition, the relative bent axle of leaf valve is positioned at the below, promptly is positioned at the below of rotating locus of the big end of connecting rod, and is positioned at a relative bent axle vertical line side opposite with cylinder.Lubricant oil in the crankshaft room that is extruded by connecting rod when therefore, piston is down moving is directly scraped near the leaf valve of such configuration.Therefore, lubricant oil can be gathered near the leaf valve apace, can improve the discharge efficient of lubricant oil.

In addition, the Cylindorical rod that is communicated with the relative cylinder chamber of access of crankshaft room and accumulator extends setting abreast.Therefore, when the energy that produces in burning makes piston moving downwards, when promptly the movement speed of connecting rod is big, lubricant oil can be scraped to access, with lubricant oil accumulate in fast leaf valve near.

In addition, if lubricant oil submergence leaf valve not, even then its part that does not have submergence is when leaf valve is opened, air also can be from crankshaft room's one side direction accumulator side leakage gas.And if there is not the part of immersion oil many like this, the air that spills is many, just can not obtain enough lifting capacitys of removal of lubricant when then valve left by leaf valve, consequently the oil extraction decreased performance of leaf valve.In this structure, make valve opening position vertically downward, simultaneously the top of leaf valve be formed for being stored in leaf valve before driving valve during the oil storage space of the lubricant oil that scraped by connecting rod etc., therefore, can form the leaf valve major part and be immersed in state in the oil.Therefore, can suppress the gas leakage of air, when driving valve, obtain sufficient lifting capacity, can guarantee the discharging performance of lubricant oil.

Again, crankcase is made of first and second case halfbody, accommodates leaf valve in the accommodation section on the mating face of being located at one of first and second case halfbody.Like this, the accommodation section is set, can easily be formed for the structure of install spring plate valve on the mating face of case halfbody.In addition, when assembling another case halfbody under the state that accommodates leaf valve in the accommodation section, leaf valve is remained on crankcase by the axial clamping of first and second crankcase along bent axle.Like this, can in the assembling crankcase, easily carry out the assembling of leaf valve to crankcase.

In addition, because leaf valve is overlapped setting in Vertical direction with the big end of scraping fuel-displaced disc portion or connecting rod.Therefore, when crankshaft rotating, utilize the big end of connecting rod or disc portion that lubricant oil is directly scraped near leaf valve, can reclaim lubricant oil effectively.

In single cylinder motor, the oil suction portion of lubricant oil supply system is overlapped setting with disc portion in Vertical direction.In addition because disc portion is positioned at the two ends of the pin portion that articulates connecting rod, so see on the plane, and the oil suction portion of disc portion coincidence be located at the cylinder barrel axle near.Therefore, even left and right vehicle wheel direction vibration is stored in the pasta up-down vibration of the oil of accumulator, the position of pasta is also very stable near oil suction portion, can always form to make oily suction portion be immersed in state in the oil.Thus, can prevent to suck air from oil suction portion, the lubricant oil supply system can stably carry out fuel feeding.

Description of drawings

Fig. 1 is the profile that is equipped with the motorcycle of internal-combustion engine of the present invention;

Fig. 2 is the sectional side view of the motor of above-mentioned motorcycle;

Fig. 3 is the orthogonal view of the motor of above-mentioned motorcycle;

Fig. 4 is the planimetric map of leaf valve;

Fig. 5 is the ground plan of leaf valve.

Symbol description

1 motorcycle

20 power plant

21 motors

33 cylinder blocks

33A cylinder chamber

34 crankcases

34A crankshaft room

The 34B accumulator

The 34C access

34D oil storage area

The right case halfbody of 34a

34b left side case halfbody

The 34c accommodation section

37 pistons

38 connecting rods

The big end of 38A

39 bent axles

39p pin portion

39w disc portion

60 leaf valves

70 lubricant oil supply systems

71 oil pumps

72 oily suction pipes

73 oily suction portions

The 73a opening end

Embodiment

Following with reference to accompanying drawing just the internal-combustion engine among the present invention describe.Fig. 1 represents to have the side view of steamboat motor type motorcycle of the internal-combustion engine of present embodiment.Below be the place ahead with the arrow F direction in scheming, arrow U direction is the top, arrow R direction is right-hand describing.This motorcycle 1 will set the Vehicular body front 2 of front-wheel 10 via tread portion 4 and set rear vehicle 3 bindings of trailing wheel 11, can travel.By head pipe 5, manage 6 and be responsible for 7 and constituted vehicle body frame down.

Head pipe 5 is extended up and down is provided in body forward structure 2, and the upper shaft supporting is set about 8, and the below is provided with front fork 9.Axle is supporting front-wheel 10 in the lower end of front fork 9.Under manage 6 and from the beginning manage 5 and extend to the rear lower side, further be bent to level, setting extends back below pedal 4.Being responsible for 7 has pairing left and right, is connected with the rear end of pipe 6 down respectively, make rear vehicle 3 to oblique rear to rise, and then bend to level to the height of regulation, rearward extend setting.Above this person in charge 7, dispose seat 12.

Near the joint of being responsible on 7 and following pipe 6, rearward give prominence to and be provided with carriage 13, on this carriage 13, supporting power plant 20 freely by linkage component 14 swings.Power plant 20 are by the motor 21 of single-cylinder 4 stroke formulas, constitute with the cvt output of motor 21 and the V belt gear 22 that transmits and with the output of gear 22 reducing gear 23 that transmits that slows down, and forwards are connected by pivot 16 with linkage component 14 end of the outstanding suspension holdfast 15 that is provided with from the lower end of the crankcase 34 of motor 21.23 supporting wheels 11 of reducing gear, the output of motor 21 passes to trailing wheel 11 by gear 22 and reducing gear 23, can drive motorcycle 1 and travel.In addition, between the accommodating case and be responsible for 7 of reducing gear 23, stride and be provided with rear shock absorber 17.

Motor 21 following configurations, cylinder block 33 is so that the Cylindorical rod A of the 33A of cylinder chamber leans forward significantly sets until the posture near approximate horizontal, and in addition, Cylindorical rod A is positioned at the substantial middle of left and right directions (overall width direction), extend setting forwards, backwards, the extension of power plant 20 front and back sets.Above cylinder block 33, rearward extend the suction system be provided with the motor 21 that constitutes by the induction mnifold 24 that is communicated with the intakeport 41 of motor 21, the Carburetor 25 that is connected with induction mnifold 24, the air-strainer 26 that is connected with Carburetor 25.The Carburetor that is connected with induction mnifold 24 also can be throttle-valve body, in this case, on induction mnifold 24 or cylinder head 2 fuel injector is set.

In addition, Vehicular body front 2 is covered by front screen 2a, backboard 2b and anterior lower pedal 2c, and the central part of handgrip 8 is covered by handgrip cover 8a.Rear vehicle 3 is covered by body cover 3a and tail side cover 3b, and base plate 4 is covered by side cover 4a.

Fig. 2, Fig. 3 represent the sectional drawing of the motor 21 in the power plant 20.Motor 21 has cylinder head cover 31, cylinder head 32, cylinder block 33 and crankcase 34 and constitutes.

Embedding on cylinder block 33 has cylindric cylinder sleeve 35, forms the 33A of cylinder chamber that is surrounded by cylinder sleeve 35.In the 33A of cylinder chamber, be equipped with the piston 37 that in the 33A of cylinder chamber, is free to slide.Piston 37 is connected with the small end 38B of connecting rod 38, and the bent axle 39 that is bearing in freely on the crankcase 34 with cylinder block 33 combinations via connecting rod 38 and rotation is connected.In addition, surround firing chamber 40 by cylinder sleeve 35, cylinder head 32, piston 37.

Cylinder head 32 is formed with suction port 41 and exhaust port 42 in inside.Suction port 41 extends in cylinder head 32 upward, and an end is communicated with firing chamber 40 by intakeport 43, and the other end is by air-breathing connection mouth 44 and external communications.Exhaust port 42 extends downwards in cylinder head 32, and an end is communicated with firing chamber 40 by relief opening 45, and the other end is by exhaust connection mouth 46 and external communications.

Cylinder head 32 has and is respectively mushroom air-breathing valve 47 and exhaust valve 48.Two

valve

47,48 1 ends are installed on the valve shaft, are supported by guard ring, and the other end is by being supported on

valve spring

49,50 on the cylinder head 32 respectively to the direction application of force that intakeport 43 and relief opening 45 are closed.

In addition, rotation is supported with freely and is used to make air-breathing valve 47 and exhaust valve 48 to do the camshaft 51 of switch motion on cylinder head 32, is transmitted the rotation of bent axle 39 by not shown link chain mechanism.Be formed with the cam 52,53 corresponding respectively on the camshaft 51 with two

valves

47,48, rotation along with camshaft 51, cam 52,53 pushing Rocker arm 5s 4,55, thus, the

valve

47,48 corresponding with each cam 52,53 and Rocker arm 54,55 is urged by the power of

valve spring

49,50, and intakeport 43 and relief opening 45 are respectively at the switch on opportunity of regulation.

On air-breathing connection mouth 44, above-mentioned induction mnifold 24 is installed, and Carburetor 25 and air-strainer 26 is installed by induction mnifold 24.From the fresh air of air-strainer 26 with the state of fuel mix under by suction port 41, supply with to fuel chambers from the intakeport 43 open by the action of air-breathing valve 47.In addition, not shown spark plug is installed on the cylinder head 32, makes the mixed gas that supplies to firing chamber 40 in burning on the opportunity of regulation by this spark plug.It is moving downwards that this burning promotes piston 37.In addition, not shown gas exhaust manifold is installed on exhaust connection mouth 46.The gas that 40 internal combustion produce in the firing chamber is discharged to the outside from the relief opening 45 open by the action of exhaust valve 48 by exhaust port 42 and gas exhaust manifold.

As shown in Figure 3, crankcase 34 is made of the left case halfbody 34b in the right case halfbody 34a on car body right side and car body left side, be by adjusting the mutual junction plane of two

case halfbody

34a, 34b, and links into an integrated entity with a plurality of binder bolts and to form.Form the 34A of crankshaft room of sealing substantially in the inside of crankcase 34.Crankcase 34 combines with

cylinder block

33, and 34A of crankshaft room and the 33A of cylinder chamber are communicated with, when piston 37 reciprocatingly slides in the 33A of cylinder chamber, and the 34A of crankshaft room pulsation.Be formed with the 34j of pair of bearings portion, 34j at the internal face that forms the 34A of this crankshaft room.On the 34j of bearing portion, 34j, be provided with the bearing of metal types.

Bent axle 39 is made of main shaft part 39s, the pairing left and right disc 39w of portion, 39w and the 39p of pin portion, wherein, be formed with pairing left and

right collar

39j, 39j on the main shaft 39s, the pairing left and right disc 39w of portion, 39w extend to the axle orthogonal direction from main shaft part 39s, form one with main shaft part 39s,

collar

39j, 39j are positioned at axial inboard relatively, and the 39p of pin portion is extending axially to main shaft part 39s between two 39w of disc portion, 39w.Two

axle journal

39j, 39j embed the 34j of bearing portion, the 34j of crankcase 34, and by its free rotary ground supporting, the 39p of pin portion is connected with big end (major part) 38A of connecting rod 38.

Two 39w of disc portion, 39w respectively one have the 39p of connecting pin portion the

end arm

39a, 39a and see roughly equilibrium block 39b, the 39b of semicircle shape along the side that the opposite direction of arm 39a extends.This equilibrium block 39b sees in the side of bent axle 39 and has described outermost rotating locus.Among the 34A of crankshaft room owing to do not store lubricant oil, so, reduce the cylindric of volume and be configured as, internal face and its subtend of the close crankcase 34 of

equilibrium block

39b, 39b as far as possible along the rotating locus of such bent axle 39.Moreover, as shown in Figure 3,

axle journal

39j, 39j are embedded in the 34j of bearing portion, the 34j of crankcase 34 owing to be positioned at the axial outside of two 39w of disc portion, 39w, therefore, the part of taking in two 39w of disc portion, 39w and the 39p of pin portion in the 34A of crankshaft room becomes and roughly seals shape.In addition, the part of taking in this two

disc

39w, 39w and the 39p of pin portion just in time forms left and right

sides case halfbody

39a, 39b engaging portion.

Main shaft part 39s in a side of bent axle 39 is equipped with the not shown driving wheel that is connected with gear 22, makes itself and the rotation of bent axle 39 one, and the rotation of bent axle 39 is delivered to gear 22.In addition, star gear train 56 is installed, itself and bent axle 39 one are rotated at the main shaft part 39s of opposite side.Also the left end at bent axle 39 is equipped with AC generator 57, and generator body 58 is from the outer side covers crankcase 34 of AC generator 57.

Connecting rod 38 has: have circular port, and be articulated in the big end 38A of the 39p of pin portion of bent axle 39; Have circular port, and be articulated in the small end 38B of the wrist pin of piston 37; The 38C of bar portion that big end 38A and small end 38B connect, big end 38A by with the linkage component 38a of small end 38B and link rod part 38C one and cover 38b to dividing.Connecting rod 38 uses the bolt 38c, the 38c that insert from the sidepiece of cover 38b that two parts 38a, 38b connection is formed by clipped the 39p of pin portion of bent axle 39 by rod unit 38a and cover 38b.As shown in Figure 2, connecting rod 38 makes the side see that the outer side surface of circular-arc cover 38b and the top of

bolt

38c, 38c face crankshaft room 34.In addition, the big end 38A of connecting rod 38 has by the softer metals shaping, is located at the metal bearing 38d between circular port and the 39p of pin portion.

Take in the volume that the 34A of crankshaft room of bent axle 39 will be as far as possible little.Be that lubricant oil is not stored in the form in the 34A of crankshaft room in the present embodiment, but be stored in the crankcase 34 inner accumulator 34B that form.Below the 34A of crankshaft room, be formed with the next door 34g that extends and tilt along all around to the front lower place, lower wall surface by the following and crankcase 34 of this next door 34g surrounds accumulator 34B, and the top of next door 34g forms the communicating space 34E that is communicated with the access 34C of the inside formation of crankcase 34.The front end of next door 34g and rear end are formed with notch 34h, the 34i of up/down perforation, and accumulator 34B is communicated with communicating space 34E by these notchs 34h, 34i, and is communicated with access 34C and the 34A of crankshaft room.

Access 34C surrounds by forming the 34d of portion, 34e from the outstanding path of the internal face of the crankcase 34 that forms the 34A of crankshaft room, and straight-line extension and forming, and extends to the rear lower side from the below internal face that forms the 34A of crankshaft room to be provided with.The access 34C of present embodiment with the Cylindorical rod A almost parallel ground extension of the 33A of cylinder chamber, simultaneously, extends setting along the wiring direction of the 34A of crankshaft room cylindraceous shown in dotted arrow B.Access 34C is at the opening 34Ca of the 34A of the crankshaft room side internal face at crankcase 34, near the position on the 38A opposite, big end of the connecting rod 38 when being located at the neutral position that is positioned at top dead center and lower dead center in 37 times moving processes of piston.

Like this, in the rear end from the linearly extended access 34C of the 34A of crankshaft room leaf valve 60 is installed, accumulator 34B is communicated with 34A of crankshaft room and access 34C by this leaf valve 60.In addition, be formed with the oily storage area 34D that is surrounded by from the outstanding 34f of muscle portion of the rear end internal face of crankcase 34 above leaf valve 60, leaf valve 60 is installed on the crankcase 34, constitutes a following part that forms oily storage area 34D.Pei Zhi leaf valve 60 is arranged on the more below of the rotating locus of the rotating locus of connecting rod 38 and the 39w of disc portion (equilibrium block 39b) like this.

At this, do simple declaration with reference to Fig. 4, Fig. 5 with regard to the structure of leaf valve 60.It is that the flat supporting substrate 61 of essentially rectangular constitutes that this leaf valve 60 has by metal sheet forming.Substantial middle portion at supporting substrate 61 is formed with the valve opening 62 that connects along plate thickness direction.On this supporting substrate 61, be formed with the sealing gasket 63 of the film shape that the peripheral part of upper and lower surface and circumferential lateral surface all cover by elastomers such as rubber.And, the sealed member 67 of sealing between the periphery of sealing gasket 63 is provided with leaf valve 60 and crankcase 34.

Form the reed 64 of essentially rectangular on the plane that the configuration of a side of supporting substrate can be carried out switch with the pressure of the gas by valve opening 62, make it block valve opening 62, and, side is equipped with restriction reed 64 open positions below this reed 64, and the stopper of the posture of guiding reed 64 resiliently deformables.This reed 64 and stopper 65 utilize the bolt 68 that inserts from the top (reverse side of the face of reed 64 is installed) of supporting substrate to fix with the state of single armed bearing length direction one end.

Reed 64 utilizations have flexual synthetic resin or metallic material etc. and make lamellar.On the other hand, stopper 65 is removed the part of supporting end and is left below supporting substrate 61 and form by the shapings such as metallic material with rigidity.Thus, when reed 64 deflections, by stopper restriction reed 64 lifting capacitys (amount of below supporting substrate 61, leaving).In addition, relative with the valve opening 62 of stopper to part, connect the thickness of slab direction and be formed with the area punching 65a littler than valve opening 62.

In addition, on left case halfbody 34b, be provided with the otch of the essentially rectangular that the appearance profile with above-mentioned leaf valve 60 roughly coincide left from mating face, utilize this otch to be formed for the accommodation section 34c of install spring plate valve 60 on crankcase 34 with right case halfbody 34a.The leaf valve 60 of above-mentioned formation is incorporated in the accommodation section 34c of left case halfbody 34b on being assembled in crankcase 34 time, makes its valve opening position downward, and promptly stopper 65 relative reeds 64 are positioned at the below, and reed 64 is held by elastically deformable ground downwards.

And, the mating face of left case halfbody 34b is engaged with the mating face of right case halfbody 34a, assembling left and right

sides case halfbody

34a, 34b, thus, the mating face contraposition of the right side of leaf valve 60 and left case halfbody 34b, leaf valve 60 is by left and right sides case halfbody 34a, the 34b axial clamping along bent axle 39.In addition, the tolerance of size of leaf valve 60 absorbs by the resiliently deformable of the sealing gasket 63 of the circumferential lateral surface installation of covering supporting substrate 61.When assembling left and right

sides case halfbody

34a, 34b, formation makes sealing gasket 63 be close to the state of crankcase 34 by sealed member 67, and leaf valve 60 is securely held on the crankcase 34.

Like this, leaf valve 60 is housed in the accommodation section 34c on the mating face of being located at crankcase 34.Therefore, leaf valve 60 is arranged on and the big end 38A that is positioned at the connecting rod 38 that the 39p of pin portion that is located at bent axle 39 central authorities articulates, and the vertical lower of the right hand web 39w of the right part of the 39p of connecting pin portion.That is, see that on the plane leaf valve 60 overlaps configuration with the big end 38A of connecting rod 38 and the disc 39w on right side.

The lubricant oil that stores in accumulator 34B is supplied with it by lubricant oil supply system 70 as lubricant oil each one to power plant 20.This lubricant oil supply system 70 has: be installed in the generator case 58 and rotate the gerotor pump 71 that drives with the one of bent axle 39; Be located in crankcase 39 and the generator case 58 the oily suction pipe 72 that the suction side of oil pump 71 is connected with accumulator 34B; With the not shown oily output tube that is connected from the lubricated each several part of the discharge side of oil pump 71, the oil suction portion 73 of oily suction pipe 72 is arranged on the inside of accumulator 34B.The opening end 73a of oil suction portion 73 is located at the below of the pasta OL of the oil that stores among the accumulator 34B.When driving oil pump 71, lubricant oil flows into oily suction pipe 72 from the opening end 73a of oil suction portion 73.

In addition, its part of oily suction portion 73 is located at the vertical lower of left hand web 39w.That is, oily suction portion 73 sees its part and left hand web 39w coincidence and disposes from the plane.

When motor 21 startings of the present embodiment of such formation, piston 37 reciprocatingly slides in the 33A of cylinder chamber, bent axle 39 rotations.Thus, oil pump 71 work will be discharged from oil pump 71 at the oil that accumulator 34B stores.The oil of discharging from oil pump 71 is applied to the 39p of pin portion lubricated of for example lubricated or the bearing 38d and the bent axle 39 of cylinder sleeve 35 and piston 37, gets back to the 34A of crankshaft room afterwards.

On the other hand, as shown in Figure 2, along with the reciprocating action of piston 37, the big end 38A of connecting rod 38 sees that from the side the pin 39p with bent axle 39 does spinning movement along the direction shown in the arrow R together.Therefore, as shown in Figure 2, when piston 37 from the state that is in top dead center when lower dead center is slided (moving down), be positioned at the big end 38A downward rear rotation of the connecting rod 38 in the place ahead.Under state shown in Figure 2, be positioned at platen surface 39c, the 39c rotation of equilibrium block 39b, the 39b of top, it is moved in the 34A of crankshaft room.

In the oil in the 34A of crankshaft room, be in two lubricant oil between

disc

39w, 39w by the rotation along with the big end 38A of 37 times moving connecting rods 38 of piston, downward rear is taken off at the outer circumferential face of tegmentum parts 38b and the top of bolt 38c.In the time of near the big end 38A of connecting rod 38 rotates to minimum point, the oil that scrapes like this is sent to the access 34C that extends along the wiring direction.

In the oil in the 34A of crankshaft room, be near the lubricant oil of two disc 39w, by the rotation along with 37 times two moving disc 39w of piston, the platen surface 39c, the 39c that are

balanced piece

39b, 39b scrape.Near piston 37 moved to lower dead center, when

equilibrium block

39b, 39b rotated half cycle approximately, the oil that is scraped by platen surface 39c was sent to access 34C equally.

Like this, the oil in the 34A of crankshaft room is sent to access 34C, can oil in reserve in the 34A of crankshaft room.The oil that is sent to access 34C is mobile like that shown in dotted line B among Fig. 2, arrives oily storage area 34D.

At this, leaf valve 60 towards oily storage area 34D installation, near piston 37 is in top dead center, when being negative pressure in the 34A of crankshaft room, reed 64 is in the position of locking valve opening 62, near piston 37 is in lower dead center, when being malleation in the 34A of crankshaft room, resiliently deformable takes place downwards and opens valve opening 62 in reed 64, and oily storage area 34D and accumulator 34B are communicated with.

The oil that arrives oily storage area 34D is dipped into above the reed 64 of leaf valve 60 of a part that becomes the lower wall surface that forms oily storage area 34D when leaf valve 60 closes valve, is stored in the oily storage area 34D.And valve left by leaf valve 60 1, and oil just flows out downwards from valve opening 62, shown in dotted line C among Fig. 2, flows into communicating space 34E, flows to next door 34g, and imports the next door 34g that has a down dip forward into, the otch 34i inflow accumulator 34B that forms from the front end of next door 34g.

Like this, the oil of discharging from leaf valve 60 forwards flows to next door 34g.Thus, flowing into accumulator 34B from the oil of leaf valve 60 needs scheduled time, in the process that flows into next door 34g, can make the composition of air that contains in the oil break away from communicating space 34E, reduces the inflow of air to accumulator 34B.And the air in the accumulator 34B can break away from communicating space 34E by formed otch 34h from the rear end of next door 34g.Thus, can reduce air and suck lubricant oil supply system 70, guarantee the lubricated of motor 21.

Like this, in the internal-combustion engine of present embodiment, when piston 37 times was moving, the vertical line of the relative bent axle 39 of big end 38A of connecting rod 38 that is positioned at the place ahead was from the side direction opposition side that disposes cylinder block 33 and draw arc to downside and rotate.Leaf valve 60 is located at the opposite side of the vertical line of relative bent axle 39 and cylinder block 33, in addition, is provided with in the below of the rotating locus of the rotating locus of connecting rod 38 and disc 39w (equilibrium block 39b).Therefore, when piston 37 times is moving, just directly taken off near leaf valve 60 by the oil in the 34a of crankshaft room of the extrusion of the big end 38A of connecting rod 38.Therefore, can apace oil accumulation be arrived near the leaf valve 60, can improve the discharge efficient of oil.

In addition, the access 34C that is communicated with 34A of crankshaft room and accumulator 34B is parallel with the Cylindorical rod direction of the 33A of cylinder chamber, and to rear lower side extension and be provided with.This access 34C extends setting from the lower wall surface that forms the 34A of crankshaft room to the wiring direction.Therefore, access 34C at the opening 34Ca of the 34A of crankshaft room side internal face at crankcase 34, be located at when in piston 37 times is moving, being positioned at top dead center and lower dead center near the position of big end 38A subtend of connecting rod 38.Therefore, be subjected to making the piston 37 times of the energy that the mixture combustion of firing chamber 40 obtains moving, when the movement velocity of connecting rod 38 was big, the oil that scrapes was transferred to access 34C, therefore, oil can be accumulated in leaf valve 60 fast.

The valve opening position of leaf valve 60 is arranged to vertically downward, simultaneously, be formed with on the top of leaf valve 60 and be used to be stored in the oily oil storage space 34D that is taken off when valve left by leaf valve 60 to the oil of leaf valve 60, therefore, can form the major parts above the reed 64 are immersed in state in the oil.Therefore, when valve left by leaf valve, can suppress to blow into air, can when driving valve, obtain sufficient lifting capacity, and can guarantee the discharging performance of oil.

In addition, be provided with accommodation section 34c, can easily be formed for the structure of install spring plate valve 60 on the mating face of the left case halfbody 34b that constitutes crankcase 34.In addition, during the right case halfbody 34a of assembling, leaf valve 60 is remained on the crankcase 34 by left and right sides case halfbody 34a, the 34b axial clamping along bent axle 39 under with the state of the leaf valve 60 that holds at accommodation section 34c.Like this, leaf valve 60 is carried out simultaneously for the assembling of the assembling of crankcase 34 and crankcase 34 itself.

In addition, leaf valve 60 is overlapped setting in Vertical direction with the big end 38A and the disc 39w of the connecting rod 38 of taking off oil.And then access 34C is provided with along the fore-and-aft direction straight-line extension to leaf valve 60.Therefore, when bent axle 39 rotation, utilize the big end 38A of connecting rod 38 and the 39w of disc portion with oil by access 34C directly be sent to leaf valve 60 near.Like this, lubricant oil gather leaf valve 60 near before, can not collide recovery lubricant oil that can be rapidly and efficiently with the internal face of crankcase 34.

The motor 21 of present embodiment is a single cylinder motor, and a part that oil is sucked portion 73 overlaps and is provided with in Vertical direction with the disc 39w in left side.Because

disc

39w, 39w are positioned at the two ends of the 39p of pin portion that links connecting rod 38, so and the oil suction portion 73 of such disc 39w part superposition be located at the 33A of cylinder chamber Cylindorical rod A near.Therefore, even motorcycle 1 direction vibration to the left and right is stored in the pasta OL up-down vibration of the oil of accumulator 34B, the position of pasta OL is also very stable near oil suction portion 73, can keep the opening end 73a that makes oily suction portion 73 and be immersed in state in the oil.Thus, can prevent to suck air to oil pump 71, and supply with and stably to carry out from the lubricant oil of oil pump 71 from oil suction portion 73.

In addition, internal-combustion engine of the present invention is not limited to the formation of the foregoing description, can do suitable change, for example also can be the structure of multicylinder engine.And be not limited to scooter, also can be loaded on the vehicle of alternate manner.

Claims

1, a kind of internal-combustion engine has: cylinder, and it has cylinder chamber, and accommodates piston in aforementioned cylinder chamber free sliding; Crankcase, it combines with aforementioned cylinder, has the crankshaft room that is communicated with aforementioned cylinder chamber in inside, and rotation freely accommodates bent axle in aforementioned crankshaft room; Connecting rod, itself and aforementioned piston and aforementioned bent axle articulate; Leaf valve, it is located in the aforementioned crankcase, according to the pulsation of aforementioned crankshaft room and switch, the Cylindorical rod of aforementioned cylinder chamber leaned forward be provided on the vehicle, form and the accumulator that is used to store lubricant oil is communicated with aforementioned crankshaft room by aforementioned leaf valve by aforementioned crankcase, it is characterized in that: aforementioned leaf valve is located at the below of aforementioned bent axle, be positioned at a vertical line side opposite of aforementioned relatively bent axle with aforementioned cylinder, aforementioned crankshaft room and aforementioned accumulator are communicated with by the access that is formed on aforementioned crankcase, aforementioned leaf valve is arranged on the aforementioned access, and the Cylindorical rod almost parallel of the aforementioned relatively cylinder chamber of aforementioned access extends and is provided with.

2, internal-combustion engine as claimed in claim 1 is characterized in that: the top of aforementioned leaf valve be formed with before aforementioned leaf valve is driven valve during the temporary transient oil storage space that stores lubricant oil, aforementioned leaf valve is set as valve opening position vertically downward.

3, internal-combustion engine as claimed in claim 1, it is characterized in that: aforementioned crankcase is the mutual mating face along first and second case halfbody of axially cutting apart of aforementioned bent axle to be engaged form, aforementioned leaf valve is contained in the container on the mating face of being located at one of aforementioned first and second case halfbody side, is kept by aforementioned crankcase.

4, internal-combustion engine as claimed in claim 1, it is characterized in that: aforementioned bent axle links to each other by the collar that is supported by aforementioned crankcase, with the aforementioned axis neck and the pin portion of extending the big end that is connected aforementioned connecting rod that is provided with to a pair of disc portion of extending with the axle orthogonal direction, between aforementioned a pair of disc portion vertically constitutes, and aforementioned leaf valve is configured to overlap in Vertical direction with at least one of the big end of of aforementioned a pair of disc portion and aforementioned connecting rod.

5, internal-combustion engine as claimed in claim 4, it is characterized in that: be provided with an aforementioned cylinder, be provided with the oil suction portion of lubricant oil supply system that supplies with the lubricant oil of lubricated usefulness to the vehicle each several part at aforementioned accumulator, aforementioned oily suction portion at least a portion is set to overlap in Vertical direction with another of aforementioned a pair of disc portion.