CN107429633B

CN107429633B - Internal combustion engine

Info

Publication number: CN107429633B
Application number: CN201680018612.0A
Authority: CN
Inventors: 杉浦广之
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2015-03-31
Filing date: 2016-03-15
Publication date: 2019-07-05
Anticipated expiration: 2036-03-15
Also published as: PH12017501731A1; BR112017020752B1; MY185387A; JPWO2016158368A1; JP6383094B2; CN107429633A; BR112017020752A2; WO2016158368A1; PH12017501731B1

Abstract

A kind of internal combustion engine, cam chain drive sprocket is set to camshaft, the one end of cam chain stretcher guiding piece is rotatably pivotally supported in crankcase via fulcrum, the partition wall member that the inside chain chamber being formed in crankcase in a manner of accommodating cam chain drive sprocket and Dynamo Room separate is installed on crankcase, wherein, fulcrum (59) is configured at the outside of partition wall member (66) when from the direction of the axis along crankshaft (13), and it is passed through on the direction of the axis along crankshaft (13) from the outside of crankcase (14) and is supported on crankcase (14).Thereby, it is possible to realize the miniaturization of the partition wall member separated between inside chain chamber and Dynamo Room.

Description

Internal combustion engine

Technical field

The present invention relates to a kind of internal combustion engine, via multiple on the crankcase of one of constituent element as body of the internal-combustion engine Bearing and be supported with crankshaft in a way freely spinning way, in the crankshaft from the axis along the crankshaft in multiple bearings Line is provided with cam chain drive sprocket on the bearing protruding portion outstanding that side configures, in the cam chain drive chain The cam chain of oriented camshaft transmitting power is wrapping on wheel, which is supported in a way freely spinning way as described interior The cylinder head of another constituent element of combustion engine main body, Xiang Suoshu cam chain apply the cam chain stretcher guiding piece of tension One end is rotatably pivotally supported in the crankcase via fulcrum, is equipped on the crankcase by inside The partition wall member that chain chamber and Dynamo Room separate, the inside chain chamber is in a manner of accommodating the cam chain drive sprocket Be formed in the crankcase, the Dynamo Room be formed in the crankcase be incorporated into the crankcase generator cover it Between.

Background technique

In patent document 1 it has been known that there is a kind of internal combustion engine, which is provided with cam chain drive sprocket on crankshaft With the axially external hydraulic pump sliding tooth for being configured at the cam chain drive sprocket in a manner of transmitting power to hydraulic pump Wheel, the inside chain chamber that cam chain drive sprocket and hydraulic pump driver gear are accommodated with to being configured at the hydraulic pump The Dynamo Room that the axially external generator of driving gear is accommodated is separated by being installed on the next door to the crankcase component.

Citation

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2010-101301 bulletin

Subject to be solved by the invention

However, in the internal combustion engine disclosed in above patent document 1, not only the cam chain drive sprocket and hydraulic pump Driving gear and hydraulic pump are covered by partition wall member, and are used for the one end of cam chain stretcher guiding piece can turn Dynamic mode is pivotally supported the fulcrum in crankcase and is also configured at the position covered by partition wall member, therefore partition wall member enlargement.

Summary of the invention

The present invention is given this situation to propose, its purpose is to provide one kind can be realized by inside chain chamber with The internal combustion engine of the miniaturization of the partition wall member separated between Dynamo Room.

Solution for solving the problem

In order to achieve the above object, the present invention is internal combustion engine, in the crankshaft of one of constituent element as body of the internal-combustion engine Be supported with crankshaft in a way freely spinning way via multiple bearings on case, the crankshaft from multiple bearings along The axis of the crankshaft is provided with cam chain drive sprocket on the bearing protruding portion outstanding that side configures, described convex The cam chain of oriented camshaft transmitting power is wrapping in wheel chain drive sprocket wheel, which supports in a way freely spinning way In the cylinder head of another constituent element as the body of the internal-combustion engine, Xiang Suoshu cam chain applies the cam chain of tension The one end of tight device guiding piece is rotatably pivotally supported in the crankcase via fulcrum, on the crankcase The partition wall member that inside chain chamber and Dynamo Room are separated is installed, the inside chain chamber is driven to accommodate the cam chain The mode of movable sprocket is formed in the crankcase, and the Dynamo Room is formed in the crankcase and is incorporated into the crankcase Between generator cover, the fisrt feature of the internal combustion engine is, the fulcrum is seen from the direction of the axis along the crankshaft The outside of the partition wall member is configured at when examining, and from the outer of the crankcase on the direction of the axis along the crankshaft Side passes through and is supported on the crankcase.

On the basis of the structure of fisrt feature, the second aspect of the present invention is hydraulic pump is disposed in as follows The crankcase, that is, the hydraulic pump is configured at the position for clipping the crankshaft between the fulcrum at it, and is configured at The position covered when from the direction of the axis along the crankshaft by the partition wall member, it is dynamic to the hydraulic pump side transmitting The hydraulic pump driver gear of power is set to the crankshaft in the axially external of the cam chain drive sprocket.

On the basis of the structure of second feature, the third aspect of the present invention is opened by what the partition wall member was closed Oral area is set to the crankcase, which is formed as when from the direction of the axis along the crankshaft described in encirclement Cam chain drive sprocket, the hydraulic pump driver gear and hydraulic pump driven gear, the hydraulic pump driven gear are fixed on It the pump shaft of the hydraulic pump and is engaged with the hydraulic pump driver gear.

On the basis of the structure of any feature of the fisrt feature into third feature, the fourth aspect of the present invention is, The opposed protrusion of cam chain is provided projectingly on the partition wall member, the opposed protrusion of the cam chain is from along the crankshaft The outside of axis is opposed with the cam chain.

Moreover, on the basis of the structure of any feature in fisrt feature into fourth feature, fifth feature of the invention It is, the opposed protrusion of cam chain guiding piece has been provided projectingly on the partition wall member, the cam chain guiding piece is opposed prominent The outside of portion from the axis along the crankshaft is opposed with cam chain guiding piece, the cam chain guiding piece to the crankshaft with The walking of the cam chain between the camshaft guides.

Invention effect

First feature according to the invention, the fulcrum being pivotally supported to the one end of cam chain stretcher guiding piece exist The outside of partition wall member is configured at when from the direction along the axis of crankshaft, and on the direction along the axis of crankshaft Crankcase is passed through and be supported on from outside, therefore partition wall member can be made to minimize, in addition, the installation of branch axial direction crankcase becomes It is easy.

In addition, second feature according to the present invention, the hydraulic pump in the position for clipping crankshaft between fulcrum at it exists It is covered when from the direction along the axis of crankshaft by partition wall member, to the hydraulic pump driver gear of hydraulic pump side transmitting power Axially external in cam chain drive sprocket is set to crankshaft, therefore can be installed on fulcrum in the position for avoiding hydraulic pump Crankcase, so that fulcrum be made to shorten.

Third feature according to the present invention is formed as by the opening portion that partition wall member is closed from the axis along crankshaft Cam chain drive sprocket, hydraulic pump driver gear and hydraulic pump driven gear are surrounded when direction is observed, therefore can make cam Chain becomes easy to being wrapping with for cam chain drive sprocket, and the assembling of hydraulic pump is made to be easy and realize assembling operation It improves.

Fourth feature according to the present invention, the opposed protrusion of the cam chain that next door component is provided projectingly is from along crankshaft The outside of axis is opposed with cam chain, therefore can be avoided the increase of components number, and prevent cam chain from cam simultaneously Chain drive sprocket wheel falls off.

Moreover, fifth feature according to the present invention, the opposed protrusion of cam chain guiding piece that next door component is provided projectingly It is opposed with cam chain guiding piece from the outside of the axis along crankshaft, therefore can be avoided the increase of components number, and prevent Only cam chain guiding piece falls off.

Detailed description of the invention

Fig. 1 is mounted in the right side view of two-wheeled internal combustion engine.(first embodiment)

Fig. 2 is the 2-2 line cross-sectional view of Fig. 1.(first embodiment)

Fig. 3 is the 3-3 line cross-sectional view of Fig. 1.(first embodiment)

Fig. 4 is the side view for indicating the state after unloading generator, generator cover and partition wall member from the internal combustion engine of Fig. 1. (first embodiment)

Fig. 5 is omitted and the associated part of timing drive mechanism and a part with the associated part of hydraulic pump from Fig. 4 And the side view being indicated.(first embodiment)

Fig. 6 is the perspective view of part shown in fig. 5.(first embodiment)

Fig. 7 is the perspective view for indicating the inner surface side of right hand crankshaft case halfbody.(first embodiment)

Symbol description:

11 body of the internal-combustion engine

13 crankshafts

14 crankcases

16 cylinder head

25,26 ball bearing as bearing

43 cam chain drive sprockets

44 hydraulic pump driver gears

51 camshafts

56 cam chains

58 cam chain stretcher guiding pieces

59 fulcrums

61 cam chain guiding pieces

63 Dynamo Rooms

64 generator covers

65 opening portions

66 partition wall members

68 inside chain chambers

69 the first lug boss as the opposed protrusion of cam chain

70 the second lug boss as the opposed protrusion of cam chain guiding piece

77 hydraulic pumps

82 pump shafts

83 hydraulic pump driven gears

E internal combustion engine

Specific embodiment

It is explained with reference to embodiments of the present invention.It should be noted that in the following description, front and back, up and down And left and right all directions refer to from taking in the direction that the two-wheeled passenger equipped with internal combustion engine observes.

First embodiment

Firstly, in fig. 1 and fig. 2, single cylinder on two-wheeled vehicle frame (not shown), as forced air cooling type Internal combustion engine E by play driving rear-wheel WR power in a manner of be suspended into and can swing up and down, in the internal combustion with internal combustion engine E Owner's body 11 is connected with and extends in the transmission housing 12 on the right side of the rear-wheel WR and contain stepless transmission M, the rear-wheel WR is pivotally supported in the rear portion of the transmission housing 12.

The body of the internal-combustion engine 11 has: crankcase 14, and axis is rotated along the bearing of crankshaft 13 of vehicle width direction Freely；Cylinder block 15 is combined with cylinder barrel 18 and with the crankcase 14；Cylinder head 16 is combined with the cylinder block 15； And valve mechanism cover 17, it is combined with cylinder head 16.

The crankcase 14 is by the way that right hand crankshaft case halfbody 20 and left hand crankshaft case halfbody 21 to be combined into.Another party Face, the crankpin 13b that the crankshaft 13 has pair of right and left crank arm 13a and is arranged between above-mentioned crank arm 13a, in song The crankshaft room 22 for accommodating the crank arm 13a and being connected to simultaneously with the cylinder barrel 18 is formed in axle box 14.In addition, with can The piston 23 that the mode of sliding is embedded in the cylinder barrel 18 is connect via connecting rod 24 with the crankpin 13b.

The crankshaft 13 penetrates through the right hand crankshaft case halfbody 20 and the left hand crankshaft case half in a way freely spinning way Body 21, and it is supported on above-mentioned crankcase halfbody 20,21 in a way freely spinning way, in the crankshaft 13 and right hand crankshaft case half It is clamped with the first ball bearing 25 as bearing between body 20, is clamped between the crankshaft 13 and left hand crankshaft case halfbody 21 As the second ball bearing 26 of bearing and the cricoid containment member 27 of the axially external configuration in the second ball bearing 26.

Together referring to Fig. 3, is protruding and protruded into the transmission housing 12 from the left hand crankshaft case halfbody 21 The left part of the crankshaft 13 is provided with driving pulley 28, which constitutes a part of the stepless transmission M.Institute Driving pulley 28 is stated to have the fast pulley 29 for being fixed on the crankshaft 13 and be configured at the axially inner side of the fast pulley 29 and with energy The movable wheel 30 that mode is supported on the crankshaft 13 is enough moved axially, is wrapping between the fast pulley 29 and the movable wheel 30 There is V band 31.

By the work of centrifugal gearshift 32, the movable wheel 30 with the crankshaft 13 revolving speed increase and by Drive close to the side of the fast pulley 29, the centrifugal gearshift 32 has: cam surface 33 is formed in described movable The face of the side opposite with the fast pulley 29 of wheel 30；Pouring weight holding plate 34, with from opposite with the fast pulley 29 one Side and the opposed mode of the movable wheel 30 are fixed on the crankshaft 13；And multiple pouring weights 35, they are maintained at described convex Between wheel face 33 and the pouring weight holding plate 34.

Cooling fan 36c is fixed in the left end of the crankshaft 13 in addition, described in the body of the internal-combustion engine 11 A part of crankcase 14, the cylinder block 15 and the cylinder head 16 are covered by shield 37, by the cooling fan 36 to Cooling air is sent into the shield 37.Moreover, end face is to the corner of the piston 23 and in face of in institute before spark plug 39 The mode for stating the combustion chamber 38 formed between cylinder block 15 and the cylinder head 16 is installed on the left side wall of the cylinder head 16, Fixed configurations have guiding wall 40 in the shield 37, and the guiding wall 40 is by the cooling air from the cooling fan 36 to described It is guided around spark plug 39.

The raised member 45 of cylinder, the cylinder are fixed with from the protruding portion outstanding of the first ball bearing 25 in the crankshaft 13 Raised member 45 be provided integrally with cam chain drive sprocket 43 and configuration than the cam chain drive sprocket 43 by axial The hydraulic pump driver gear 44 of the position in outside, first ball bearing 25 are between the crankcase 14 and the crankshaft 13 The ball bearing configured along the axis of the crankshaft 13 near right side in the first ball bearing 25 and the second ball bearing 26 being arranged. In addition, being configured with generator 46 in the axially external of the hydraulic pump driver gear 44, fixed in the right part of the crankshaft 13 There is the internal rotor 47 of the generator 46.

It is equipped with inlet valve and exhaust valve (not shown) in a manner of being able to carry out opening and closing work in the cylinder head 16, In the cavaera 49 formed between the cylinder head 16 and the valve mechanism cover 17, containing makes the inlet valve and the row The valve mechanism 50 of work is opened and closed in valve.

The valve mechanism 50 has: camshaft 51, has the axis parallel with the crankshaft 13, and to rotate freely Mode be supported on the cylinder head 16；Air inlet side Rocker arm 52 is arranged between the camshaft 51 and the inlet valve；And Exhaust side Rocker arm 53 is arranged between the camshaft 51 and the exhaust valve.

Together referring to Fig. 4, by making the timing drive mechanism 54 of reduction ratio 1/2 to the one of the composition valve mechanism 50 The partial camshaft 51 transmits the rotary power from the crankshaft 13.

The timing drive mechanism 54 passes through in the cam chain drive sprocket 43 for being fixed on the crankshaft 13 and admittedly It is formed due to being wrapping with cricoid cam chain 56 on the cam chain driven sprocket 55 of the camshaft 51, for the cam chain 56 The cam chain room 57 of walking than the position of the cylinder barrel 18 on the right side described in be formed in the body of the internal-combustion engine 11 Right hand crankshaft case halfbody 20, the cylinder block 15 and the cylinder head 16.

Moreover, first ball bearing 25 of sandwiched allows the stream of gas between crankshaft 13 and the right hand crankshaft case halfbody 20 Logical, cam chain room 57 is connected to crankshaft room 22.

In the cam chain 56 from the cam chain drive sprocket 43 towards the cam chain driven sprocket 55 walk and are possible to loose part, and sliding contact has cam chain stretcher guiding piece 58, which draws The one end of guiding element 58 is rotatably supported on right hand crankshaft case halfbody 20 via fulcrum 59.It will in addition, playing The cam chain stretcher guiding piece 58 is installed on described to the stretcher 60 of the active force of 56 side compression of cam chain Cylinder block 15.In addition, being driven from the cam chain driven sprocket 55 towards the cam chain in the cam chain 56 The part that movable sprocket 43 is walked, sliding contact have the cam chain guiding piece guided to the walking of the cam chain 56 61, the one end of the cam chain guiding piece 61 is accepted by carrier 62, which is integrally provided to right hand crankshaft case Halfbody 20 and be formed as to 13 side of crankshaft open substantially V shape, the middle part of the cam chain guiding piece 61 is with energy The mode enough rotated is supported between the cylinder block 15 and the cylinder head 16.

Together referring to Fig. 5 and Fig. 6, it is combined with generator cover 64 on the right hand crankshaft case halfbody 20, in the generator The Dynamo Room 63 for accommodating the generator 46 is formed between cover 64 and the right hand crankshaft case halfbody 20.

It is outer in the outer end than inner cylinder portion 20b with the outer end configuration of outer cylindrical portion 20a on the right hand crankshaft case halfbody 20 The mode of the position of side has been provided projectingly outer cylindrical portion 20a and inner cylinder portion 20b, the outer cylindrical portion 20a are formed into bottomed tube The peripheral wall of the generator cover 64 combines, and the inner cylinder portion 20b is in a manner of making lower part of a part along the outer cylindrical portion 20a It is configured at the position for being biased to the lower section of the outer cylindrical portion 20a.

The inner cylinder portion 20b is formed as cross section circle in a manner of forming opening portion 65, and the opening portion 65 is close by liquid Ground is embedded in the closing of the partition wall member 66 in the inner cylinder portion 20b, with outstanding on the inside of the inner circumferential of the opening portion 65 The supporting board 67 at circumferential two positions that mode and the inner cylinder portion 20b are wholely set, which tightens to be connected, has the partition wall member 66.Inside chain chamber 68 and the Dynamo Room 63 are separated by the partition wall member 66, the inside chain chamber 68 is to accommodate The mode of the cam chain drive sprocket 55 and the hydraulic pump driver gear 44 is formed in the right hand crankshaft case halfbody 20 It is interior, and constitute a part of the cam chain room 57.

On the partition wall member 66 by 68 side of inside chain chamber it is outstanding in a manner of be wholely set first protrusion Portion 69 and the second lug boss 70, first lug boss 69 and the second lug boss 70 are used for fixture when unloading the partition wall member 66 Fastening connection, the first lug boss 69 are configured at the outside from the axis along the crankshaft 13 as the opposed protrusion of cam chain The position opposed with cam chain 56, the second lug boss 70 are configured at as the opposed protrusion of cam chain guiding piece from along institute State the outside of the axis of crankshaft 13 position opposed with the cam chain guiding piece 61.

The fulcrum 59 supported to the one end of the cam chain stretcher guiding piece 58 is from along described When the direction observation of the axis of crankshaft 13, it is configured at the outside of the i.e. described opening portion 65 in outside of the partition wall member 66, on edge Passed through from the outside of the crankcase 14 on the direction of the axis of the crankshaft 13 and be supported on the crankcase 14.

The right hand crankshaft case halfbody 20 is provided with bearing bearing wall portion 20c and sidewall portion 20d, and the bearing supports wall portion 20c rotatably supports the crankshaft 13 via the first ball bearing 25, and the sidewall portion 20d is in the inner cylinder portion 20b Be configured at the position that axially inner side is leaned in outer end than the inner cylinder portion 20b between the outer cylindrical portion 20a, and from outside with it is described Bearing bearing wall portion 20c is opposed, is provided with insertion hole 71 on the sidewall portion 20d, sets on bearing bearing wall portion 20c It is equipped with the threaded hole 72 coaxial with the insertion hole 71.

The fulcrum 59 be be embedded in liquid-tight manner the insertion hole 71 expanding head 59a and with the threaded hole 72 The bolt screwed togather, the cam chain stretcher configured between the sidewall portion 20d and bearing bearing wall portion 20c draw The one end of guiding element 58 can be rotated by the fulcrum 59 bearing.

It is formed with oily reservoir 75 in the lower part of the crankcase 14, is provided with liquid on the left hand crankshaft case halfbody 21 Face checks that window 76, the liquid level check that window 76 is used to recognize the liquid level of the oil in the oily reservoir 75 from external view.

It is equipped with hydraulic pump 77 on the outside of the bearing bearing wall portion 20c in the right hand crankshaft case halfbody 20, it should Hydraulic pump 77 draws oil and being supplied by lubrication portion to internal combustion engine E by oil from the oily reservoir 75, which is configured at The position of the crankshaft 13 is clipped between the fulcrum 59 at it, and is configured in the direction from the axis along the crankshaft 13 The position covered when observation by the partition wall member 66.

The hydraulic pump 77 is the trochoid pump for having internal rotor 78 and the outer rotor 79 engaged with the internal rotor 78, in shape The recess portion 80 of the bearing of bearing described in Cheng Yu wall portion 20c contains the internal rotor 78 and the outer rotor 79, by the recess portion 80 Flat pump cover 81 fastening closed is linked to the bearing bearing wall portion 20c.

The internal rotor 78 is fixed on pump shaft 82, which penetrates through the pump cover 81 in a way freely spinning way, and Both ends support wall portion 20c and the partition wall member 66 by the bearing and rotatably support, the pump cover 81 with it is described The hydraulic pump driven gear 83 configured between partition wall member 66 is fixed on the pump shaft 82, the hydraulic pump driver gear 44 and institute State the engagement of hydraulic pump driven gear 83.

Moreover, be formed as by the opening portion 65 that the partition wall member 66 is closed, from the axis along the crankshaft 13 Direction surrounds the cam chain drive sprocket 43, the hydraulic pump driver gear 44 and the hydraulic pump driven gear when observing 83。

It is equipped on the bearing bearing wall portion 20c of the right hand crankshaft case halfbody 20 because in the crankshaft room 22 Pressure oscillation and the oil in the crankshaft room 22 is discharged in its valve opening for the needle spring plate valve 85 being opened and closed, the needle spring plate valve 85, the needle Leaf valve 85 is configured at the position covered by the partition wall member 66.

The bearing bearing wall portion can be set to as follows by the oily outlet 88 that the needle spring plate valve 85 is closed 20c, that is, under the side view from the direction of the axis direction along the crankshaft 13, at least part of oily outlet 88 Configure the position in the discribed rotational trajectory C in periphery than the crank arm 13a on the inside of radial direction.

Together referring to Fig. 7, the oil outlet 88 is formed as rectangular shape, using one corner 88a as the side of lowest point Formula is formed in the bearing bearing wall portion 20c of the right hand crankshaft case halfbody 20.

In addition, flat spool 86 is mounted directly by the needle spring plate valve 85 by, for example, a pair of of screw member 89 It is formed in the outer surface of the bearing bearing wall portion 20c of the right hand crankshaft case halfbody 20, opposite direction opens the oily outlet The restriction plate 87 that the working end of the spool 86 of 88 side work is limited based on the screw member 89 by being realized The fastening together with the spool 86 and fastening be linked to the bearing bearing wall portion 20c.

In addition, the internal perisporium 90 of the crankshaft room 22 is corresponding with the discribed rotational trajectory C in the periphery of the crank arm 13a And it is formed, but be provided with the substantially V shape for being formed as opening upwards and outstanding prominent downwards in the lower part of the internal perisporium 90 Oily collection portion 92, the lateral margin of the oil outlet 88 are formed at portion 91, the lower part which is arranged in the crankshaft room 22 A part formed along the protrusion 91.

The medial surface 91a of a side of a pair of inside face 91a, 91b that the protrusion 91 has are formed as along crank arm 13a The discribed rotational trajectory C in periphery tangent line L, a lateral margin of the oily outlet 88 of rectangular shape is along the party Medial surface 91a configuration.

Then, the effect for illustrating the embodiment, the partition wall member 66 that inside chain chamber 68 and Dynamo Room 63 are separated It is installed on right hand crankshaft case halfbody 20, the inside chain chamber 68 is to accommodate cam chain drive sprocket 43 and hydraulic pump driver gear 44 mode is formed in the right hand crankshaft case halfbody 20 of crankcase 14, which is wrapping with to camshaft 51 The cam chain 56 of power is transmitted, Dynamo Room 63 is formed in right hand crankshaft case halfbody 20 and is incorporated into the right hand crankshaft case halfbody Between 20 generator cover 64, fulcrum 59 is configured at the partition wall member 66 when from the direction of the axis along crankshaft 13 Outside, and passed through on the direction of the axis along the crankshaft 13 from the outside of the crankcase 14 and be supported on the song Axle box 14, the fulcrum 59 will apply the one end of the cam chain stretcher guiding piece 58 of tension to cam chain 56 with can The mode of rotation is supported on the right hand crankshaft case halfbody 20, thus can make partition wall member 66 minimize, in addition, fulcrum 59 to The installation of crankcase 14 becomes easy.

In addition, hydraulic pump 77 is disposed in the right hand crankshaft case halfbody 20 as follows, that is, hydraulic pump 77 is configured at Its position that the crankshaft 13 is clipped between the fulcrum 59, and be configured in the direction from the axis along the crankshaft 13 The hydraulic pump driver gear 44 of the position covered when observation by the partition wall member 66,77 side of Xiang Suoshu hydraulic pump transmitting power exists The axially external of the cam chain drive sprocket 43 is set to the crankshaft 13, therefore can be in the position for avoiding hydraulic pump 77 Fulcrum 59 is installed on crankcase 14, so that fulcrum 59 be made to shorten.

In addition, being set to the right hand crankshaft case halfbody 20, the opening by the opening portion 65 that the partition wall member 66 is closed Portion 65 is formed as surrounding the cam chain drive sprocket 43, described when from the direction of the axis along the crankshaft 13 Hydraulic pump driver gear 44 and hydraulic pump driven gear 83, the hydraulic pump driven gear 83 are fixed on the pump shaft of the hydraulic pump 77 It 82 and is engaged with the hydraulic pump driver gear 44, therefore being wrapping with to cam chain drive sprocket 43 of cam chain 56 can be made It becomes easy, and keeps the assembling of hydraulic pump 77 easy and realize the raising of assembling operation.

In addition, it is provided projectingly the first lug boss 69 as the opposed protrusion of cam chain in the partition wall member 66, it should First lug boss 69 is opposed with the cam chain 56 along the outside of the axis of the crankshaft 13, therefore can be avoided component Several increases, and prevent the falling off from cam chain drive sprocket 43 of cam chain 56.

In addition, being provided projectingly in the partition wall member 66 as from the outside of the axis along crankshaft 13 and cam chain Second lug boss 70 of the opposed opposed protrusion of cam chain guiding piece of guiding piece 61, the cam chain guiding piece 61 is to described The walking of the cam chain 56 between crankshaft 13 and the camshaft 51 guides, therefore can be avoided components number Increase, and prevents falling off for cam chain guiding piece 61.

In addition, the needle spring plate valve 85 being opened and closed by the pressure oscillation in crankshaft room 22 in its valve opening by the crankshaft room The mode of oil discharge in 22 is disposed in the right hand crankshaft case halfbody 20, the oily outlet that can be closed by the needle spring plate valve 85 88 are set to the right hand crankshaft case halfbody 20 as follows, that is, in the direction from the axis direction along the crankshaft 13 Under the side view of observation, at least part of oily outlet 88 is configured in the discribed rotation rail in periphery than the crank arm 13a Position of the mark C on the inside of radial direction, therefore song can be can be realized by the axis of needle spring plate valve 85 and crankshaft 13 close to configuration The miniaturization of axle box 14.

In addition, the oily outlet 88 for being formed as rectangular shape is formed in the way of lowest point by one corner 88a In the right hand crankshaft case halfbody 20, therefore oil can reliably be discharged from oily outlet 88.

In addition, the needle spring plate valve 85 is by being directly mounted at the right hand crankshaft case halfbody 20 for flat spool 86 It forms, therefore does not need the support housing etc. supported to spool 86, so as to reduce components number, and oil can be made Outlet 88 is close to the lowest point of crankshaft room 22, and (Japanese: オイ Le is extremely residual for the oily dead zone surplus that can reduce in crankshaft room 22 Amount).

In addition, in the crankshaft room 22 corresponding with the discribed rotational trajectory C in the periphery of crank arm 13a and formation The lower part of peripheral wall 90 is provided with the substantially V shape for being formed as opening upwards and downwards protrusion 91 outstanding, which sets It is set to the lower part in the crankshaft room 22 and forms oily collection portion 92, and a part of the lateral margin of the oily outlet 88 is along institute The formation of protrusion 91 is stated, therefore the dead space volume of crankshaft room 22 can be reduced and improve leakproofness, to realize the discharging performance of oil Raising.

In addition, the medial surface 91a of the side in a pair of inside face 91a, 91b that protrusion 91 has is formed as along crank arm The tangent line L of the discribed rotational trajectory C of 13a, a lateral margin of the oily outlet 88 of rectangular shape is along the party Medial surface 91a configuration, therefore so that oily efficiency is gathered in oily set well by the rotation of the crank arm 13a in crankshaft room 22 Portion 92 effectively oil can be discharged from oily outlet 88 by the valve opening of needle spring plate valve 85.

Moreover, the needle spring plate valve 85 is configured at the position covered by the partition wall member 66, therefore by partition wall member 66 Needle spring plate valve 85 in the state of unloading becomes easy to the assembling of crankcase 14.

Embodiments of the present invention are explained above, but the present invention is not limited to above embodiment, can not take off Various design alterations are carried out in the case where from its purport.

Claims

1. a kind of internal combustion engine, via multiple bearings on the crankcase (14) of one of constituent element as body of the internal-combustion engine (11) (25,26) and be supported with crankshaft (13) in a way freely spinning way, in the crankshaft (13) from multiple bearings (25,26) The axis along the crankshaft (13) be provided on bearing (25) protruding portion outstanding that right side configures cam chain drive Movable sprocket (43) is wrapping with the cam chain of oriented camshaft (51) transmitting power on the cam chain drive sprocket (43) (56), which is supported on another constituent element as the body of the internal-combustion engine (11) in a way freely spinning way Cylinder head (16), Xiang Suoshu cam chain (56) apply the one end of the cam chain stretcher guiding piece (58) of tension via branch Axis (59) and be rotatably pivotally supported in the crankcase (14), be equipped on the crankcase (14) by inside The partition wall member (66) that chain chamber (68) and Dynamo Room (63) separate, the inside chain chamber (68) is to accommodate the cam chain The mode of drive sprocket (43) is formed in the crankcase (14), and the Dynamo Room (63) is formed in the crankcase (14) it and is incorporated between the generator cover (64) of the crankcase (14),

The internal combustion engine is characterized in that,

The fulcrum (59) is configured at the partition wall member (66) when from the direction of the axis along the crankshaft (13) Outside, and pass through and be supported on from the outside of the crankcase (14) on the direction of the axis along the crankshaft (13) The crankcase (14).

2. internal combustion engine according to claim 1, which is characterized in that

Hydraulic pump (77) is disposed in the crankcase (14) as follows, that is, the hydraulic pump (77) is configured in itself and institute It states and clips the position of the crankshaft (13) between fulcrum (59), and be configured in the direction from the axis along the crankshaft (13) The position covered when observation by the partition wall member (66),

The hydraulic pump driver gear (44) of power is transmitted in the cam chain drive sprocket (43) to the hydraulic pump (77) side Axially external be set to the crankshaft (13).

3. internal combustion engine according to claim 2, which is characterized in that

The crankcase (14) are set to by the opening portion (65) that the partition wall member (66) are closed, which is formed as The cam chain drive sprocket (43), the hydraulic pump are surrounded when from the direction of the axis along the crankshaft (13) Driving gear (44) and hydraulic pump driven gear (83), the hydraulic pump driven gear (83) are fixed on the hydraulic pump (77) It pump shaft (82) and is engaged with the hydraulic pump driver gear (44).

4. internal combustion engine according to any one of claim 1 to 3, which is characterized in that

The opposed protrusion of cam chain (69), the opposed protrusion of the cam chain (69) have been provided projectingly on the partition wall member (66) It is opposed with the cam chain (56) from the outside of the axis along the crankshaft (13).

5. internal combustion engine according to any one of claim 1 to 3, which is characterized in that

The opposed protrusion of cam chain guiding piece (70) is provided projectingly on the partition wall member (66), the cam chain guiding piece The outside of opposed protrusion (70) from the axis along the crankshaft (13) is opposed with cam chain guiding piece (61), the cam chain Guiding piece (61) guides the walking of the cam chain (56) between the crankshaft (13) and the camshaft (51).