CN108571353A - Oil filtering structure for internal combustion engine - Google Patents

Abstract

This application involves a kind of oil filtering structures for internal combustion engine.The oil filtering structure being arranged in the internal combustion engine with engine case (20) includes the filter cell (123) being accommodated in filter housings (121) with oil filter (120), the oil filter.There is the filter cell (123) hollow barrel-type shape, the filter housings (121) to be the tubular form with open end and closed bottom and be formed on the outer wall of the engine case (20).The open end of the filter housings (121) is closed by lid (122), and the filter housings (121) have the slot (V) being formed in its tubular inner peripheral surface.The slot (V) extends axially into from the open end in the filter housings (121) along the central axis (Lf) of the filter housings.This oil filter as small as possible and to safeguard to be easy.

Description

Oil filtering structure for internal combustion engine

Technical field

The present invention relates to the oil filtering structures being arranged on the engine case of internal combustion engine.

Background technology

Such oil filter known in the state of the art：The oil filter accommodates filter cell and is arranged in internal combustion engine Engine case in (for example, seeing patent document 1).

[existing technical literature]

[patent document]

[patent document 1]

JP4663581B

The disclosed oil filter for internal combustion engine of patent document 1 is supported by pump cover and is disposed in covering engine On the right case cover on the right side of the crankcase of case.

Oil filter is boxlike, and wherein filter cell is accommodated in case, which has is closed by the return plate of dish type Opening.The oil filter is highlightedly mounted on the retainer of pump cover.

Invention content

The problem to be solved in the present invention

Engine case is surrounded by body frame and other components, and require oil filter as small as possible to avoid with vehicle body bone Frame and other components interfere.

Filter cell, which is accommodated in, to be made in case as small as possible.Therefore, the case and the filter cell Between gap as low as when the filter cell is removed out of described case to be safeguarded, be clamped using nipper plier described in The outer peripheral edge of the return plate of dish type pulls out the filter cell out of described case.

As such, it is necessary to which gap between the case and the filter cell is sufficiently large to be inserted into it to accommodate In the nipper plier end be clamped the dish type return plate outer peripheral edge.

Therefore need the gap for accommodating the end of the nipper plier that the size of the case is prevented to further decrease.

Surrounding is had little influence on from the outwardly projecting oil filter of engine case as disclosed in patent document 1, even if the case Some are big.However, when filter housings (case) are formed on the engine case, even if the filter housings It is slight to increase the layout for changing the oil filter, it also tends to influence the design for sending cabinet.Therefore, it is necessary to make the mistake The size of filter shell is as small as possible, keeps the performance of the oil filter simultaneously for a greater degree of layout freedom.

The present invention makes in view of foregoing problems.The object of the present invention is to provide a kind of oil strain knots for internal combustion engine Structure makes oil filter as small as possible and easy to maintain.

Technical means to solve problem

In order to achieve the goal above, providing a kind of oil filtering structure for internal combustion engine, internal combustion hair according to the present invention Motivation includes engine case, and the engine case has a pair of of a crankcase and a pair of of crankcase cover, and the crankcase is used for can The mode of rotation supports bent axle, the crankcase cover to cover the corresponding side of the crankcase along the differently- oriented directivity of the bent axle, Oil filter is mounted on the engine case and with the filter cell being accommodated in filter housings, wherein：

The filter cell is hollow barrel-type；The filter housings are the tubular form with open end and blind end And it is formed on the outer wall of the engine case；Surround the described of the filter housings of the filter cell It is closed by lid open end；And there is the filter housings slot, the slot to be limited to the tubular inner circumferential of the filter housings It is extended axially into face and along the central axis of the filter housings from the open end of the filter housings In the filter housings.

Using the above arrangement, the slot is limited in the tubular inner peripheral surface of the filter housings and along institute The central axis for stating filter housings extends axially into the filter from the open end of the filter housings In shell.Although by the mistake by making the gap between the filter housings and the filter cell minimize Filter shell is made that size is smaller, and an arm of clamping device, which still is able to be inserted into, is limited at the filter housings In the slot in the tubular inner peripheral surface, and the filter cell can easily be pulled out into institute using the clamping device It states except filter housings.Thus, it is possible to easily be safeguarded to the oil filter.

As a result, the oil filter can be made as small as possible so that the size of internal combustion engine is smaller.

In a preferred form of the invention, above-mentioned arrangement, the filter housings are formed on the institute of the engine case It states on outer wall, the central axis is flatly placed；And the slot is limited to the tubular inner circumferential of the filter housings In the top in face.

Using the above arrangement, since the slot is limited at the filter housings that center axis is flatly placed In the top of the tubular inner peripheral surface, even if the clamping when the arm of the clamping device is inserted into the slot The arm of tool destroys the region on the top of the tubular inner peripheral surface of the filter housings, can also prevent described Oil in filter housings is gone out by being destroyed area leakage.

In a preferred form of the invention, there is the filter housings entrance oil circuit, oil to pass through the entrance oil circuit stream Enter in the filter housings, and when the axial direction observation along the central axis, the slot and entrance oil Road is aligned.

Using the above arrangement, due to the slot when being observed along the axial direction of the central axis and entrance oil Road is aligned, and can easily process the slot using the entrance oil circuit.

In a preferred form of the invention, the engine case has a crankcase cover being located in the crankcase cover On rounded projections, the rounded projections along the bent axle axial direction protrude；When the axis along the bent axle When being observed to direction, the filter housings are arranged in the radial outside of the rounded projections and the neighbouring circular protrusions Portion；And the entrance oil circuit is limited in the part of the neighbouring rounded projections of the filter housings.

Using the above arrangement, the entrance oil circuit is formed in the portion of the neighbouring rounded projections of the filter housings In point.Therefore, the oil circulation passage in the engine case can be designed to be as short as possible, without leading to the engine Case becomes large-sized.

The present invention another preferred form in, a bent axle be provided with from crankcase part outstanding from Heart separate type oil filter, and the centrifugation formula oil filter is located at the axially inner side of the rounded projections.

Using the above arrangement, be mounted on the bent axle from the centrifugation on crankcase shaft component outstanding Formula oil filter is accommodated in the rounded projections of the crankcase cover.Thus, the oil filter is convex adjacent to the circle The portion of rising is accommodated in the filter housings, physical interference is not occurred with the centrifugation formula oil filter, will not be led to institute State becoming large-sized for engine case.

The effect of the present invention

According to the present invention, the slot is limited in the tubular inner peripheral surface of the filter housings and along described The central axis of filter housings extends axially into the filter head housings from the open end of the filter housings In body.Although by the filtering by making the gap between the filter housings and the filter cell minimize Device shell is made to that size is smaller, but an arm of clamping device is inserted into being limited at described in the filter housings In the slot in tubular inner peripheral surface, and described in capable of easily being pulled out the filter cell using the clamping device Except filter housings.Thus, it is possible to easily be safeguarded to the oil filter.

Description of the drawings

Fig. 1 is the side view for the motorcycle for being associated with internal combustion engine, and the internal combustion engine includes according to the present invention The oil filtering structure of embodiment；

Fig. 2 is the side view of the predominantly engine case of the internal combustion engine of motorcycle；

Fig. 3 is the upward view of the component in the periphery of internal combustion engine of motorcycle；

Fig. 4 is the sectional view of the internal combustion engine, is intercepted along the line IV-IV of Fig. 9；

Fig. 5 is the enlarged fragment sectional view of a part for the internal combustion engine that Fig. 4 describes；

Fig. 6 is the sectional view of the internal combustion engine, is intercepted along the line VI-VI of Fig. 9；

Fig. 7 is the side view of internal combustion engine, and wherein right crankcase cover is removed；

Fig. 8 is the internal combustion hair that the side view of internal combustion engine, wherein centrifugal clutch and other components are described from Fig. 7 Motivation removes；

Fig. 9 is the sectional view of the internal combustion engine, is placed along perpendicular to the crankshaft center line across right crankcase Plane interception；

Figure 10 is the stereogram of the right crankcase cover；

Figure 11 is the enlarged fragment stereogram of the filter housings of right crankcase cover, wherein centrifuging the mistake of formula oil filter Filter element and The lid component are removed；

Figure 12 is the enlarged fragment stereogram of the filter housings of right crankcase cover, wherein the filter cell is received Wherein；

Figure 13 is the sectional view of the centrifugation formula oil filter, wherein the The lid component is removed；

Figure 14 is the sectional view of the centrifugation formula oil filter, wherein the The lid component is mounted thereto；And

Figure 15 is the stereogram of the oil circulation passage of internal combustion engine.

Reference sign

E internal combustion engines, 1 motorcycle, 20 engine cases, 21L left crankcases, 22L left crankcase covers, 21R right crankcases, 21Rv side walls, 21Rs periphery walls, 21Rsb bottom walls, 21Rsf mating surfaces, 21Rp protective bulkheads,

22R right crankcase covers, 22Rv side walls, 22Rva rounded projections, outside 22Rs Peripheral wall, 22Rsa antethecas, 22Rsb bottom walls, the angles 22Rsc wall, 22Rsf mating surfaces,

23 cylinder block, 24 cylinder head,

40 bent axles, 40L left axle components, 40R right axle components, 40Ra spline shafts, 40Rb shaft ends, oil circuit in 40A first axles, oil circuit in 40B right axles, 41 base bearings, 54 outer tubes, 60 driving plates, 61 annular convex platform, 70 centrifugal clutch,

75 centrifuge formula oil filter, 76 cover plates, 77 lip rings, 78 spiral shells Bolt, 100 fuel tanks, 101 outages, 101c open tubulars portion, 102 oil guards, 103 caps, 103r ribs, 104 sealing rings, 105P draw oil circuit,

110 oil pumps, 111 oil pump covers, 115P discharge oil circuit,

120 oil filters, 121 filter housings, 121a bottom walls, the outlets 121b protrusion Portion, 121c installation bases, 121f open ends, 121s threaded holes, 122 lids, 122a flat cylindricals portion, 122b flanges, 123 filter cells, 124 bolts, 125 inlet tubes, 125P entrance oil circuits, 126 outlets, 126P export oil circuit, 131 tubular ribs, 131P, 132P, 133P oil circuit, 134 tubular ribs, 134P oil circuits, 135P, 136P oil circuits, 141 tubular ribs, 141P, 142P oil circuit, 142 ribs, 143 bearings, 143A bearing holes,

V slots,

151 bottom side backboards, 152 opening paranotums, 152a annular slabs, 152b bands bottom Pipe portion, 153,154,155 lip rings, 156 Spring holders, 156f are convex Edge, 157 springs, 158 sealing rings,

170 camshafts, 171 cam sprocket wheels, 172 timing chains, 173i intake rockers, 173 exhaust rocker arms

Specific implementation mode

Embodiments of the present invention are described below with reference to attached drawing.

Fig. 1 is the side view for the motorcycle 1 for being associated with internal combustion engine E, which includes according to the present invention The oil filtering structure of embodiment.

In the following description, it is used herein forward, backward, to the left and right direction or similar direction statement be according to According to the usual direction standard on motorcycle 1 according to the present embodiment, the wherein direction of 1 straight forward of motorcycle is known as forwards To.In the accompanying drawings, FR represents forward direction, and RR represents backward directions, and LH represents left direction, and RH represents right direction, and UP represents upward direction.

Motorcycle 1 has body frame, which includes：Main frame 3, the main frame 3 from head tube 2 it is oblique after and to Lower extension；A pair of of left and right pivot plate 4, the left and right pivot plate suspend downwards from the rear end of main frame 3；A pair of of left and right afterframe, The left and right afterframe is oblique rear from the rear end of main frame 3 and upwardly extends；And a pair of of subframe 6, the subframe is in main frame 3 Extend between afterframe 5.

Handle 7h is installed on the upper end of steering shaft 7, the branch in a manner of it can carry out angle movement by head tube 2 of steering shaft 7 Support.Steering shaft 7 has the lower part for being connected to front fork 7f, and front-wheel 8 is rotatably supported at the lower part of front fork 7f Distally.

Swing arm 11 has is pivotally supported the front end on pivot plate 4 by pivot 10, to which swing arm 11 can be around pivot Axis 10 is vertically swung.Trailing wheel 12 is pivotally supported on the rear end of swing arm 11.

Posterior bumper 13 is between swing arm 11 and afterframe 5.

Motorcycle 1 further includes internal combustion engine E, which suspends from engine lifting bracket 3h and hung by engine Frame 3h and pivot plate 4 support, and the engine lifting bracket is downward from the part of the center in the main frame 3 of main frame 3 rearward It is prominent.

Internal combustion engine E is four strokes, single cylinder, ventilation type internal combustion engine, and is mounted in a manner of horizontal orientation On body frame so that it has the bent axle 40 that the longitudinal axis across body frame is transversely directed to (see Fig. 4).

As shown in figure 3, internal combustion engine E has engine case 20, the engine case includes：A pair of of left and right crankcase 21L and 21R, the left and right crankcase detach transverse to each other, and bent axle 40 is rotatably supported by the left and right crankcase； And a pair of of left and right crankcase cover 22L and 22R, the corresponding left side of the left and right crankcase cover covering left and right crankcase 21L and 21R The right side and.

Sequentially stacked cylinder block 23, cylinder head 24 and valve mechanism cover 25, from the left and right crankcase 21L of engine case 20 It is protruded forward with 21R.

Thus for cylinder block 23 outstanding with cylinder body therein is limited to, which has cylinder body axis Lc as it forward Central axis, which turns forward and basic horizontal.Cylinder head 24 and valve mechanism cover 25 in cylinder block 23 sequentially It is stacked forward.

Air inlet pipe 30 (Fig. 1) is upwardly extended from the upper surface of cylinder head 24, which essentially horizontally protrudes forward.Into Tracheae 30 is connected to air cleaner 32, which is mounted on by throttle valve body 31 on main frame 3.

If Fig. 1 and Fig. 3 are discribed, exhaust pipe 35 extend downwardly and be bent from the lower surface of cylinder head 24 with along The lower surface of internal combustion engine E extends back.Exhaust pipe 35 is connected to muffler 38, after which is arranged in engine case 20 Side and the right side for being located at body frame.

Two catalytic converters, that is, the first catalytic converter 36 and the second catalytic converter 37 are sequentially positioned at exhaust On pipe 35.

It is basic to be oriented in 23 lower section of cylinder block close to the upstream arrangement of cylinder head 24 for first catalytic converter 36 It is horizontal and in longitudinal direction at oblique, which turns forward and nearly horizontal (see Fig. 1 and Fig. 3).It is arranged in the of downstream Two catalytic converters 37 are arranged in muffler 38 (see Fig. 1).

First catalytic converter 36 and the second catalytic converter 37 are threeway catalyst converters.

As shown in figure 3,36 downstream of the first catalytic converter extend exhaust pipe 35 pass snugly through right crankcase 21R and Between the filter housings 121 of oil filter 120.

Therefore, the first catalytic converter 36 can be placed near left and right crankcase 21L and 21R.

As shown in Figure 1, the head tube 2 of body frame has the front covered by protecgulum 14.Cylinder block 23, cylinder head 24 are gentle Cylinder head cover 25 has the corresponding left and right side that is covered by leg guard cover 15, the leg guard cover extend from the top of main frame 3 and On the left and right side of main frame 3.The rear portion of main frame 3 and the left side of afterframe 5 and right side are covered by body cover 16.

Seat 18 and luggage carrier 19 are arranged at front and back position on the top of body cover 16.On before body cover 16 Opening between portion and seat 18 is by 17 closing of center cover.

The engine case 20 of internal combustion engine E is not covered by leg guard cover 15 and body cover 16, but the exposure of its side is (see figure 1)。

Brake pedal 28 extends forward in the lower section of engine case 20 from the lower part of pivot plate 4.Brake pedal 28 have to The distal portion of upper bending is located in the right side of the front of engine case 20 in a manner of swingable.

Foot pedal 29 is located in each side in the longitudinally central portion of engine case 20.

The kick starter pedal 27 extended backward and obliquely upwards is located in the right side at the rear portion of engine case 20.

Fig. 4 is the expansion sectional view of the internal combustion engine E, is intercepted along the line IV-IV of Fig. 9.As shown in figure 4, hair The bent axle 40 of motivation E has crank shape integral structure, including a pair being respectively received in left and right crankcase 21L and 21R is left Right crank arm 40w and respectively from left and right crank arm 40w left and right shaft component 40L and 40R coaxially outstanding, the left and right crank Arm is coupled to each other by crank-pin 40p.

Bent axle 40 is rotatably supported in left and right crankcase 21L and 21R so that left and right shaft component 40L and 40R close to corresponding crank arm 40w part by a pair of of left and right base bearing 41 be pivotally supported at left and right crankcase 21L and On 21R.

There is cylinder body in cylinder block 23 cylinder bore, piston 42 to be slidably assemblied in cylinder bore.Piston 42 has The piston pin 42p of the crank-pin 40p of bent axle 40 is attached to by connecting rod 43.Reciprocating motion of the piston 42 in cylinder bore is by connecting rod 43 It is converted into the rotation of bent axle 40.

Piston 42 is with the top plate face of top surface and cylinder head 24 with the top surface towards piston 42.The top surface of piston 42 with Combustion chamber 24a is defined between the top plate face of cylinder head 24.Ignition spark plug 44 is assemblied in the top plate wall of cylinder head 24, and There is electrode, the electrode are located on the end in the 24a of combustion chamber.

Drive sprocket 45, starter driven gear 46 and alternating current generator 48 sequentially arrange to the left from left base bearing 41, And be arranged on the left axle component 40L of bent axle 40, which extends to the left from left base bearing 41.

Drive sprocket 45 is integrally connected to the left axle component 40L of bent axle 40, and cam sprocket wheel 171 is integrally assemblied in On the camshaft 170 of valve operating gear, which is rotatably supported in cylinder head 25.Timing chain 172 Around drive sprocket 45 and cam sprocket wheel 171.When axis rotation of the bent axle 40 around its own, timing chain 172 makes camshaft 170 are rotated around the axis of its own with 1/2 rotating speed of the rotating speed of bent axle 40, and the admission cam on camshaft 170 is caused 170i and exhaust cam 170e makes intake rocker 173i and exhaust rocker arm 173e rotations and keeps sliding contact with them respectively, from And intake valve and air bleeding valve (not shown) are opened and close in scheduled timing respectively, inlet air-fuel mixture is drawn Enter in the 24a of combustion chamber and exhaust gas is discharged from combustion chamber 24a.

Alternating current generator 48 includes the outer rotor 48r on the left end for the left axle component 40L for being fixedly fitted to bent axle 40, and And internal rotor 48s is fixedly fastened on left crankcase cover 22L.

Starter driven gear 46 is supported on by needle bearing 49 on left axle component 40L in a rotatable way.Unidirectionally from Between starter driven gear 46 and the outer rotor 48r of alternating current generator 48, which is integrally connected to clutch 47 Bent axle 40.Single direction rotation power is transmitted to outer rotor 48r and bent axle 40 by one-way clutch 47 from starter driven gear 46, from And start to operate internal combustion engine E.

Centrifugal clutch 70 and centrifugation formula oil filter 75 are arranged on the right axle component 40R of bent axle 40, the right axle Component extends to the right from right base bearing 41.

As shown in figure 4, pump driver gear 51 is assembled on the right axle component 40R of bent axle 40, and be maintained as to By the right side of the inner ring of base bearing 41.Thrust bearing 52 is also fitted on right axle component 40R, and is maintained as driving against pump The right side of moving gear 51.Primary drive gear 53 is assemblied in a manner of it can relatively rotate on right axle component 40R, and by It is held against the right side of thrust bearing 52.

Outer tube 54 is assemblied in a manner of it can relatively rotate on right axle component 40R, and is maintained as against primary Drive the right side of the tubular base of gear 53.

As shown in figure 5, outer tube 54 has the flange 54b extended radially outward from the right end of tube 54a, the tube 54a is maintained as the tubular base against primary drive gear 53 and has diameter identical with the tubular base.Right end pipe The diameter of shape portion 54c is more than tube 54a, and is axially protruded from the right side of flange 54b.

As shown in figure 5, right axle component 40R includes spline shaft 40Ra and axially extends to the right from spline shaft 40Ra Shaft end 40Rb, which axially extends to the right from the tube 54a of outer tube 54 and with the diameter reduced, The proximal end of spline shaft 40Ra has step.

Annular component 56 is assemblied in spline shaft by the spline of the radially inner side of the right end tube 54c positioned at outer tube 54 On 40Ra, wherein gasket 55 is assemblied on spline shaft 40Ra and between step and annular component 56.

Needle bearing 57 is between the peripheral surface of annular component 56 and the inner peripheral surface of the right end tube 54c of outer tube 54.

The annular convex platform 61 of support driving plate 60 is assemblied in also by spline on spline shaft 40Ra.

Annular oil channel forms accessory 62 and is assemblied on shaft end 40Rb, the shaft end from spline shaft 40Ra axially Extend to the right and is maintained as against annular convex platform 61.Nut 64 is screwed on shaft end 40Rb, wherein gasket 63 between Annular oil channel is formed between accessory 62 and nut 64, and is tightened so that annular component 56 and annular convex platform 61 is integrally tight Gu to the right axle component 40R of bent axle 40.

Therefore the driving plate 60 being supported on annular convex platform 61 can consistently be rotated with bent axle 40.

Driving plate 60 includes being assemblied in cup-shaped outer peripheral edge portion 60a on annular convex platform 61 and from cup-shaped outer peripheral edge portion 60a The flange 60b that extends radially outward of open end.The peripheral surface of cup-shaped outer peripheral edge portion 60a covering nuts 64, and flange 60b It is axially facing the flange 54b of outer tube 54.

Centrifugal clutch 70 is arranged in the driving plate 60 that can be consistently rotated with bent axle 40 and is fixed to outer tube 54 Between the cup-shaped clutch Outside component 71 of flange 54b.

Three support shafts 72 are fixed to driving plate 60, and include respectively three clutch shoes 73 of governor weight block with can The mode of swing is supported in corresponding support shaft 72.When clutch shoe 73 (all have on its lateral surface by rubbing Liner made of material) rotation based on bent axle 40 and when being rotated, clutch shoe 73 overcomes clutch under the action of the centrifugal force The bias of spring 74 and radially swing.When the rotating speed of bent axle 40 be more than desired speed when, clutch shoe 73 be driven and with from Clutch external component 71 is contacted, and centrifugal clutch 70 is made to be engaged under the action of frictional force, thus by the rotation of bent axle 40 Turn to be transmitted to outer tube 54.

Driving plate 60 has is limited to annular space 75s therein by cover plate 76, which is placed on cup-shaped outer peripheral edge portion The right side of 60a is as the lid for covering its opening.Driving plate 60 and the cover plate 76 and annular space 75s of restriction between them are constituted Centrifugation formula oil filter 75.

The form of 76 disc-shaped component of cover plate, which, which has, is limited to center hole therein, right axle component 40R Shaft end 40Rb be assemblied in the center hole.The cover plate 76 being assemblied on shaft end 40Rb has against driving plate 60 The outer peripheral edge portion of flange 60b, lip ring 77 are mediate.Multiple bolts 78 circumferentially separated from one another pass through cover plate 76 Outer peripheral edge portion and lip ring 77 be swirled in flange 60b, and be tightened so that cover plate 76 is fastened to driving plate 60, Thus it is provided for centrifugation formula oil filter 75 and is limited to annular space 75s therein.

With reference to figure 4 and Fig. 5, the right axle component 40R of bent axle 40 has：Oil circuit 40A in short first axle, oil in the first axle Road is limited at axial centre in shaft end 40b and extends from its axially outer end facing towards spline shaft 40Ra but shorter than spline Axle portion 40Ra；And oil circuit 40B in the second long axis, oil circuit is limited at axial centre in second axis, from right crank arm 40w By spline shaft 40Ra until the position for being just not up to oil circuit 40A in first axle in shaft end 40Rb.

Oil circuit 40B has closed open-ended by the plug 79 in right crank arm 40w in second axis.

As shown in figure 5, nut 64 is swirled on the end of shaft end 40Rb, by oil circuit 40A in first axle and the second axis Interior oil circuit 40B is separated from each other.

The branch oil circuit 40Aa branched out radially outward from oil circuit 40A in first axle is limited in shaft end 40Rb, It is presented axially between nut 64 and cover plate 76, and leads in annular space 75s.

The annular convex platform 61t of support driving plate 60, which has to limit wherein and form accessory 62 by annular oily channel, to be delimited Outlet oil circuit 61a.Outlet oil circuit 61a leads in annular space 75s and extends radially inwardly to the outer of spline shaft 40Ra Circumferential surface.

The branch oil circuit 40Ba that the right end of oil circuit 40B branches out radially outward out of second axis is limited to spline shaft In 40Ra, it is in fluid communication with outlet oil circuit 61a.

Therefore, oil circuit 40A is maintained as being in oil circuit 40B in the second axis and is in fluid communication in first axle, passes sequentially through point Branch oil circuit 40Aa, the annular space 75s in centrifugation formula oil filter 75, outlet oil circuit 61a and branch oil circuit 40Ba.

When centrifuging rotation of the formula oil filter 75 based on bent axle 40 and rotate, oil oil circuit 40A out of first axle is flowed into In annular space 75s, is mixed with oil in annular space 75s and the foreign matter with larger specific gravity is radial under the influence of centrifugal force It outwards shifts and is separated, and filtered oil passes through outlet oil circuit 61a and branch oil circuit 40Ba from annular space 75s It flows into the second axis in oil circuit 40B.

As shown in figure 4, oil circuit 40B branches into extension radially outward in the second axis in the right axle component 40R of bent axle 40 To the branch oil circuit 40Bc of the branch oil circuit 40Bb and the inner peripheral surface for extending to primary drive gear 53 of the inner peripheral surface of outer tube 54.Point Branch oil circuit 40Bb and branch oil circuit 40Bc supplies the filtered oil that oil circuit 40B in axis is flowed through from centrifugation formula oil filter 75 To relative rotation surface to be lubricated, that is, the periphery of the inner peripheral surface and right axle component 40R of outer tube 54 and primary drive gear 53 Face.

Oil circuit 40B also branches into branch oil circuit 40Bd radially outward in second axis, which passes through right crank arm 40w is extended in crank-pin 40p, is maintained as and is limited at the oil circuit 40pa in crank-pin 40p in this branch oil circuit 40Bd In fluid communication.Oil circuit 40pa by out of second axis oil circuit 40B flow through the filtered oil of branch oil circuit 40Bd supplied to waiting moistening Sliding relative rotation surface, that is, the peripheral surface of crank-pin 40p and the end of connecting rod 43 being supported on crank-pin 40p it is interior Circumferential surface.

As shown in figure 9, internal combustion engine E includes the multiple-speed gear-box 80 usually engaged, which is arranged in song 40 rear of axis and with being arranged in main shaft 81 and countershaft 82 at front and back position, and be supported in a rotatable way On left and right crankcase 21L and 21R.

In left and right crankcase 21L and 21R, the pinion group 82G tools on the primary cog set 81G and countershaft 82 on main shaft 81 There is each corresponding gear for being maintained as being engaged with each other.

As shown in figure 4, the main shaft 81 of multiple-speed gear-box 80 includes prominent to the right by right crankcase 21R and supports thereon There is the part of transmission clutch 85.

Transmission clutch 85 include clutch Outside component 86 and clutch internal component 87, the clutch Outside component by The damper support 6 being rotatably supported on the primary driven gear 84 on main shaft 81, clutch inside structure Part 87 is integrally coupled to main shaft 81.The primary driven gear 84 of support clutch Outside component 86 be maintained as with can revolve The mode turned is supported on the engagement of the primary drive gear 53 on bent axle 40.

Transmission clutch 85 is the frictional multiple-disk clutch with multiple clutch disks, and the multiple clutch disk is released Laying mechanism drives and into and out mutual frictional engagement, the relieving mechanism can be operated by the bicyclist of motorcycle 1.It is described from Clutch disk includes being attached to multiple clutch disks of clutch Outside component 86 and being attached to the multiple of clutch internal component 87 Clutch disk, and these clutch disks are arranged by pitching in a manner of conjunction.When clutch disk is mutually rubbed under spring force Wipe engagement when, transmission clutch 85 is engaged, by torque from clutch Outside component 86 by clutch disk and clutch inside Component 87 is transferred to main shaft 81.When clutch disk is detached from mutual frictional engagement by relieving mechanism, transmission clutch 85 is de- It opens, cuts off the torque transfer by clutch disk and clutch internal component 87 to main shaft 81 from clutch Outside component 86.

The countershaft 82 of multiple-speed gear-box 80 is used as its output shaft comprising passes through left crankcase 21L left ends outstanding to the left Portion.Drive sprocket 88 is fixedly fitted on the left part outstanding of countershaft 82.

Transmission chain 89 is around drive sprocket 88 and is also about driven sprocket (not shown), which coaxially connects To trailing wheel 12.Therefore driving force is transferred to trailing wheel 12 from internal combustion engine E by multiple-speed gear-box 80 and transmission chain 89, propulsion rubs Motorcycle 1.

As shown in Fig. 6 and Fig. 9, gear shift drum 90 is rotatably supported on left and right crankcase 21L and 21R, place In the oblique upper of main shaft 81 and countershaft 82, main shaft 81 and countershaft 82 are arranged parallel to each other and are rotatably supported on left and right song On axle box 21L and 21R.

As shown in fig. 6, gear shift drum 90 have be limited to circumferential guiding groove 90Aa in the peripheral surface of its tubular body 90A and 90Ab, for axially moving corresponding shift fork 91 and 92.Gear shift drum 90 includes：With the left end shaft 90L for reducing outer diameter, the left side End axis protrudes from tubular body 90A and assembled and be supported in a manner of it can carry out angle movement to the left is defined to left song In bearing hole in axle box 21L；Flange 90f on the right end of tubular body 90A；And there is swedged right end axis 90R, the right end axis is prominent to the right from flange 90f and is supported in a manner of it can carry out angle movement by means of needle bearing 93 In the bearing hole in being defined to right crankcase 21R.

The left end shaft 90L of gear shift drum 90 is supported in a manner of it can carry out angle movement and is defined in left crankcase 21L In bearing hole in, which has substantially lower and upper parts, and left end shaft 90L is in a manner of it can carry out angle movement It is supported in the lower half, the first half gives over to cavity to keep oil wherein.

The right end axis 90R of gear shift drum 90 is placed on the needle bearing in bearing hole in a manner of it can carry out angle movement 93 supports, the bearing hole are limited in right crankcase 21R and wide to being sufficient to accommodate needle bearing 93.Therefore it prevents with can Carrying out the supported gear shift drum of mode 90 of angle movement makes its axis tilt, and allows smooth rotation without resistance.

As described above, bent axle 40, main shaft 81, countershaft 82 and gear shift drum 90 are rotatably supported at left and right bent axle In case 21L and 21R, and be arranged bent axle 40 slave right crankcase 21R to the right on right axle component 40R outstanding it is centrifugal from It clutch 70 and centrifuges formula oil filter 75 and the slave right crankcase 21R biographies on part outstanding to the right in main shaft 81 is set Dynamic clutch 85 is arranged on the right side of right crankcase 21R, as seen from Fig. 4.

As shown in figure 4, centrifugal clutch 70, centrifugation formula oil filter 75 and transmission clutch 85 are by right crankcase cover 22R is covered, which covers the right side of right crankcase 21R.

Fig. 2 is the side view of the engine case 20 of predominantly internal combustion engine E.Fig. 7 is the side view of internal combustion engine E, Wherein right crankcase cover 22R is removed from right crankcase 21R.Fig. 8 is the side view of internal combustion engine E, wherein centrifugal clutching Device 70 centrifuges formula oil filter 75 and transmission clutch 85 and is removed by the internal combustion engine E described in Fig. 7.

As shown in Figure 7 and Figure 8, right crankcase 21R includes：Side wall 21Rv, bent axle 40 and main shaft 81 etc. are with rotatable side Formula is supported on the side wall and the side wall extends perpendicular to the axial direction of right crankcase；And periphery wall 21Rs, it should Periphery wall axially extends from the outer peripheral edge of side wall 21Rv.The periphery wall 21Rs of right crankcase 21R has the end face being open to the right, It is used as mating annular face 21Rsf (as the chain-dotted line in Fig. 7 and Fig. 8 is described) to coordinate with right crankcase cover 22R.

Slave right crankcase 21R 70 Hes of centrifugal clutch on right axle component 40R outstanding to the right in bent axle 40 are set Centrifugation formula oil filter 75 and slave right crankcase 21R transmission clutches on part outstanding to the right in main shaft 81 are set 85 are located in the inside of the mating annular face 21Rsf of the periphery wall 21Rs of right crankcase 21R, as seen from Fig. 7.

As shown in figure 8, oil pump cover 111 (oil pump 110 is mounted on its inner surface) is by positioned at the oblique front lower place of bent axle 40 Bolt 113 be fixed to the side wall 21Rv of right crankcase 21R.

Oil pump 110 includes pump drive shaft 110a, and the right side for being maintained as and being assemblied in bent axle 40 is equipped in the pump drive shaft The pump driven gear 112 that pump driver gear 51 on shaft component 40R engages.

Therefore, when axis rotation of the bent axle 40 around its own, the rotation of bent axle 40 is engaged with each other by being maintained as Pump driver gear 51 and pump driven gear 112 be transferred to pump drive shaft 110a, activate oil pump 110.

Fig. 9 is that the periphery wall 21Rs across right crankcase 21R of internal combustion engine E is put along the axis perpendicular to bent axle 40 The sectional view for the plane interception set.As shown in figure 9, the periphery wall 21Rs of right crankcase 21R includes bottom wall 21Rsb, bottom wall tool There is open tubular portion 101c, which is projecting downwardly into 110 lower section of oil pump and has and limit wherein and open downwards The outage 101 of mouth.

Outage 101 in open tubular portion 101c is closed by cap 103.

Open tubular portion 101c has internal thread inner peripheral surface.

Cap 103 includes：Pan-shaped cover 103a, the pan-shaped cover be maintained as against open tubular portion 101c open end and It is in closed relationship with outage 101；External screw thread tube 103c, the external screw thread tube project upwards simultaneously from pan-shaped cover 103a And it is screwed in the internal thread inner peripheral surface of open tubular portion 101c；And hexagonal bolt head 103b, the hexagonal bolt head is from dish type Lid 103a is downwardly projected far from external screw thread tube 103c.

Cap 103 is installed to be closing outage 101 in the following manner：External screw thread tube 103c is inserted into outage To screw in the internal thread inner peripheral surface of open tubular portion 101c in 101, wherein sealing ring 104 is between pan-shaped cover 103a and open tube Between the open end of shape portion 101c.

In web form oil guard 102 by spring 102s be maintained in the external screw thread tube 103c of cap 103 and by It is inserted into outage 101.

As shown in Figure 7 to 9, there are six the rib 103r opened with equal angle intervals for tool on the peripheral surface of pan-shaped cover 103a.

Cap 103 is secured to open tubular portion 101c in the following way：External screw thread tube 103c is screwed to opening In the internal thread inner peripheral surface of tube 101c, and hexagonal bolt head 103b is tightened using the tool that holding is engaged with it.

Therefore, in order to remove cap 103, tool is engaged with hexagonal bolt head 103b, unscrews hexagonal bolt head using tool 103b, and with hand rotation hexagonal bolt head 103b until its disengaging opening tube 101c.

Even if cap 103 can be utilized the rib 103r on the peripheral surface of finger engagement pan-shaped cover 103a by oil immersion at this time if wet And reliably ease rotation cap.

Protective bulkhead 21Rp dashes forward downwards in the front of open tubular portion 101c and cap 103 from the bottom wall 21Rsb of right crankcase 21R Go out.

Protective bulkhead 21Rp is perpendicular to the vertical wall that the longitudinal direction of motorcycle 1 extends.Protective bulkhead 21Rp is opened for protecting Mouthful tube 101c and cap 103 to prevent in motorcycle 1 when driving towards internal combustion engine E rubbles flown etc..

When protective bulkhead 21Rp is impacted, protective bulkhead 21Rp is destroyed, to prevent open tubular portion 101c and cap 103 It is damaged.

Outage 101 is maintained as and is limited to the fuel tank in the bottom wall 21Lsb and 21Rsb of left and right crankcase 21L and 21R 100 in fluid communication.It is maintained as and oil by the outside (upstream side) for the oil guard 102 that cap 103 is maintained in outage 101 Case 100, which is in, to be in fluid communication, and the inside (downstream side) of oil guard 102 is maintained as and extends to the arrival end of oil pump 110 It draws oil circuit 105P (see Fig. 8) and is in and be in fluid communication.

Oil circuit 115P is discharged from the outlet end of oil pump 110 to extend.

Discharge oil circuit 115P extends through to the right oil pump cover 111, and connection is provided on the right side of oil pump cover 111 Open end 115a (see Fig. 8).

As shown in figure 15, discharge oil circuit 115P flatly extends forward from the outlet end of oil pump 110, curved in its front end Folding, then flatly extends to the right, and is maintained as being in fluid communication with the entrance oil circuit 125P of oil filter 120, such as institute later Description.

Figure 10 be from rear obliquely from when right crankcase cover 22R stereogram.Fig. 2 shows right crankcase cover 22R Exterior side.

As shown in Figure 10, the right crankcase cover 22R on the right side of covering right crankcase 21R has rectangular cup shape, including The side wall 22Rv and axially extend to the right from the periphery of side wall 22Rv outer that axial direction basically perpendicular to bent axle 40 is arranged Peripheral wall 22Rs.

The periphery wall 22Rs of right crankcase cover 22R has open end to the left, is used as the mating surface with right crankcase 21R The mating surface 22Rsf of 21Rsf cooperations.The right side of right crankcase cover 22R covering right crankcases 21R, centrifugal clutch 70, centrifugation Separate type oil filter 75 and transmission clutch 85 are accommodated in right crankcase cover 22R and on the right side of right crankcase 21R.

Closing is had outstanding to the left by the side wall 22Rv of the periphery wall 22Rs of the right crankcase cover 22R right openings limited Rounded projections 22Rva meets centrifugal clutch 70 and centrifuges formula oil filter 75.Rounded projections 22Rva has Tubular type bearing 143, it is centrally arranged on rounded projections and protrude inwardly to the left.Tubular type bearing 143, which has, to be limited wherein Bearing hole 143A, the shaft end 40Rb of the right axle component 40R of bent axle 40 be assemblied in a rotatable way in the bearing hole (see Fig. 5).

As shown in figure 5, in the first axle being limited in the shaft end 40Rb of right axle component 40R oil circuit 40A have lead to axis Shaft end opening in bearing bore 143A, provides the fluid communication between oil circuit 40A and bearing hole 143A in first axle.

As shown in Figure 10, rounded projections 22Rva has the multiple radially extending ribs being arranged on its inner surface.At these In radially extending rib, the relatively wide rib 142 that extends forward, which has, is limited to oil circuit 142P therein (referring also to Fig. 5).

The periphery wall 22Rs of right crankcase cover 22R includes antetheca 22Rsa (see Figure 10), which has on its inner surface The tubular rib 141 horizontally extended on the axial direction direction to the right and to the left of bent axle 40.Tubular rib 141 has limit It is scheduled on oil circuit 141P therein, the right end of the oil circuit, which is maintained as being in the front end of the oil circuit 142P in rib 142, to be in fluid communication. The left end of oil circuit 141P is used as connection open end 141a.

As shown in Fig. 2, the oil filter 120 for wherein accommodating filter cell 123 is arranged in the periphery of right crankcase cover 22R The lower section of the antetheca 22Rsa of wall 22Rs.

Specifically, the filter housings 121 with tubular form of oil filter 120 are formed in the angle wall of periphery wall 22Rs 22Rsc is upper and is partly protruded outward from the angle wall, and the angle wall is between antetheca 22Rsa and bottom wall 22Rsb.

As seen from Fig. 2, tubular filter shell 121 is positioned adjacent to the rounded projections of right crankcase cover 22R 22Rva。

(they are common from the antetheca 21Rsa of the antetheca 22Rsa and right crankcase 21R of right crankcase cover 22R for cylinder block 23 Ground constitutes the antetheca of engine case 20) it protrudes forward.

Tubular filter shell 121 opens wide to the right, and center axis Lf is horizontally oriented (see Figure 11) along horizontal direction. In the state that filter cell 123 is inserted into filter housings 121, opening closes (Fig. 2, Fig. 3 and figure by lid 122 14)。

Lid 122 is fastened to filter housings 121 by bolt 124.

Oil filter 120 is arranged on the angle wall 22Rsc of the periphery wall 22Rs of right crankcase cover 22R so that oil filter 120 Part obliquely forward and is downwardly projected (see Fig. 2).

As shown in Fig. 2, the upper end of oil filter 120 is in the lowermost portion substantially the same height with cylinder block 23 and is higher than The lower surface of the bottom wall 22Rsb of periphery wall 22Rs.

As shown in figure 8, oil filter 120 is arranged in the position lower than oil pump 110, shown in dotted line.

As shown in figure 3, the lid 122 at the right end of oil filter 120 is in the right lateral surface from rounded projections 22Rva The position retracted to the left, the right lateral surface protrude to the right from the side wall 22Rv of right crankcase cover 22R.

As depicted in figure 10 and figure 13, the tubular filter shell 121 of oil filter 120 has from its upper sidewall portions upward Protrusion and the inlet tube 125 extended to the left.

The left end of inlet tube 125 is used as connection open end 125a (Figure 10), and oily with entrance therein is limited to The right half of road 125P, the entrance oil circuit lead to filter housings 121 for being in fluid communication with it.

Entrance oil circuit 125P is arranged in the part of the neighbouring rounded projections 22Rva of filter housings 121 (see Fig. 2, figure 13 and Figure 14).

As illustrated in figures 11 and 13, it includes top (in being located on the vertical direction of motorcycle that filter housings 121, which have, Above mandrel line Lf) tubular inner peripheral surface, which, which has, is limited to slot V therein, and the slot is along central axis Lf from mistake The right open end of filter shell 121 is extended to the in filter shell 121.

When the axial direction observation along central axis Lf, slot V is positioned to be aligned that (oil passes through institute with entrance oil circuit 125P It states entrance oil circuit to flow into filter housings 121).

It, can be by by mistake since the axial direction observation time slot V along central axis Lf is aligned with entrance oil circuit 125P Filter shell 121 is drilled to entrance oil circuit 125P axially along central axis Lf from its right open end and is readily formed Slot V.

Entrance oil circuit 125P and it is limited to filter housings 121 when as shown in figure 15, due to axially observing Slot V alignments in the top of tubular inner peripheral surface, entrance oil circuit 125P are located in the top of filter housings 12.Due to by oil pump 110 outlet end remains the discharge oil circuit 115P being in fluid communication with each other with entrance oil circuit 125P and horizontally extends, so being caught The air in oil pump 110 is obtained to tend to be released from this.

As shown in figure 11, with the filter housings 121 with bottom hollow barrel-type shape with bottom wall 121a, which has Pipe-type outlet boss 121b, the pipe-type outlet boss is inwardly prominent to the right and is maintained as being in fluid communication with outlet oil circuit 126P (see Figure 14).

The filter cell 123 being inserted into filter housings 121 has made of the filter paper for being folded into bellows Hollow barrel-type shape.As shown in Figure 13 and Figure 14, backboard 151 and 152 is maintained as two end faces against filter cell 123 And it is in combination integral.

As shown in Figure 13 and Figure 14, the backboard 151 of the bottom wall 121a towards filter housings 121 is (because referred to herein as bottom side is carried on the back Plate 151) there is open disc shape to be formed and be maintained as the inner face against filter cell 123.Bottom side backboard 151 and filtering Device element 123 is supported on the outlet boss 121b on the bottom wall 121a of filter housings 121, intervenient annular Sealing element 155 is assembled in the opening of backboard 151 and on outlet boss 121b.

The backboard 152 (therefore being referred to as the paranotum 152 that is open) being positioned in the opening of filter housings 121 includes quilt It is held against the annular slab 152a of the outer end face of filter cell 123 and is extended to the over filter from the inner peripheral of annular slab 152a Band bottom tubular portion 152b in the opening of element 123.

With bottom tubular Spring holder 156 be assemblied in opening paranotum 152 band bottom tubular portion 152b in, and with from Its open end extends radially outwardly and is maintained as the flange 156f of the annular slab 152a against opening paranotum 152.Such as figure Shown in 14, for spring 157 between Spring holder 156 and lid 122, which is secured to the open end of filter housings 121 For filter cell 123 to be maintained in filter housings 121 securely.

As shown in figure 13, the annular slab 152a of opening paranotum 152 includes being omited on the axial direction of filter housings 121 Micro- outwardly projecting outer peripheral edge portion provides the outer annular ridge 152aa of offset.

Bottom side backboard 151 and opening 152 outer diameter having the same of paranotum, are slightly less than the tubular of filter housings 121 The internal diameter of inner peripheral surface.When filter cell 123 is integrally combined with bottom side backboard 151 and the paranotum 152 that is open is inserted into When in filter housings 121, it is suitable with the gap between the tubular inner peripheral surface of filter housings 121 to be located at opening paranotum 152 It is small.

As shown in figure 14, lid 122 is such structure comprising is assemblied in flat in the opening of filter housings 121 Cylindrical portion 122a and it is arranged on the outer end of flat cylindrical portion 122a and against the convex of the open end 121f of filter housings 121 Edge 122b, the thus opening of enclosed filters shell 121.

The flat cylindrical portion 122a of lid 122 has the exterior circumferential slot being integrally limited in the circumferential in its peripheral surface 122av.Sealing ring 158 is assemblied in exterior circumferential slot 122av.

As is illustrated by figs. 11 and 12, the open end of filter housings 121 has a pair of of installation base 121c, the pair of peace It is radially outward prominent (that is, forward and backward) to fill boss, and peace is extended to wherein and from open end 121f with restriction Fill the corresponding threaded hole 121s in boss 121c.

The flange 122b of lid 122 has is limited to bolt therein at the position corresponding to corresponding installation base 121c Hole.The phase that bolt 124 (Fig. 2) is inserted by the corresponding bolt hole in flange 122b and is swirled in installation base 121c In the threaded hole 121s answered, thus lid 122 is fastened to 121 open end of filter housings.

As shown in figure 11, filter housings 121 are formed on the wall 22Rsc of angle, which is located at the outer of right crankcase cover 21R Between the antetheca 22Rsa and bottom wall 22Rsb of peripheral wall 22Rs, and integrally combined with bottom side backboard 151 and opening paranotum 152 Filter cell 123 be inserted into filter housings 121.As shown in Figure 12 and Figure 13, on bottom side backboard 151 medially The lip ring 155 of installation is assembled in the outlet boss 121b projected centrally out from the bottom wall 121a of filter housings 121 On, and filter cell 123 is supported on outlet boss 121b, and wherein lip ring 155 is mediate.

Lid 122 is suitably mounted on the open end of filter housings 121 and keeps sealing ring 158 mediate, and bullet Spring 157 is between Spring holder 156 and lid 122.

As shown in figure 14, the entrance oil circuit 125P in inlet tube 125 has right half (being illustrated as left half in fig. 14), The right half leads to the inside of filter housings 121 and is maintained as in flow communication.Therefore, it is flowed into from entrance oil circuit 125P In oil stream to the peripheral surface of filter cell 123 in filter housings 121.

The oil flowed on the peripheral surface of filter cell 123 is flowed into radially inward in filter cell 123, should Filter cell is from the fractionlet filtered out in oil in foreign matter, such as mud and metal powder granulates.Filtered oil stream enter by In the opening that the inner peripheral surface of filter cell 123 limits, the bottom wall 121a being limited at positioned at filter housings 121 is then passed through On pipe-type outlet boss 121b in access into inlet/outlet oil circuit 126P.

As shown in Figure 14 and Figure 15, oil circuit 126P is exported from centrally arranged pipe-type outlet boss 121b on bottom wall 121a Extend to the left, be folded upward at, then bends (being to the right in figures 14 and 15) to the left.Outlet oil circuit 126P extends through outlet Pipe 126 (is shown in FIG. 10 and defines outlet oil circuit 126P), and the connection on the left end positioned at outlet 126 is opened It is open at mouth end face 126a.

Such as from figure 10, it is seen that the connection open end of the connection open end 125a of inlet tube 125, outlet 126 126a and tubular rib 141 are arranged in the connection open end 141a immediately above of inlet tube 125, are arranged to and right song The mating surface 22Rsf of axle box cover 22R is flushed.

As shown in figure 8, on the right crankcase 21R covered by right crankcase cover 22R, the oil pump of oil pump 110 is extended through There is the discharge oil circuit 115P of cover 111 the connection open end 115a being located on the right side of it, the connection open end to be located at towards figure The position of the connection open end 125a of the inlet tube 125 of right crankcase cover 22R shown in 10.

It is formed on its periphery wall 21Rs and towards right crankcase cover 22R's as shown in figure 8, right crankcase 21R has The tubular rib 131 horizontally extended along right crankcase at the position of the connection open end 126a of outlet 126.Tubular rib 131 have the connection open end 131a being located on its right end.

As shown in figure 8 and 13, right crankcase 21R, which has, is limited to oil circuit 132P therein, the oil circuit upwardly extend across The oil circuit 131P being more limited in tubular rib 131, and be limited to oil circuit 133P therein obliquely extend in the longitudinal direction and Across the upper end of oil circuit 132P.

As shown in FIG. 13 to 15, the oil circuit 132P upwardly extended in right crankcase 21R is connected to via oil circuit 131P Export oil circuit 126P, the outlet oil circuit from the central outlets boss 121b on the bottom wall 121a of filter housings 121 to the left Extend.Oil circuit 132P is arranged to the entrance oil circuit 125P with oil so as to inflow filter housings 121 when observing in side view It is in overlapping relation.

Oil circuit 132P is positioned relative to filter housings 121 as far as possible rearward, such as the situation of entrance oil circuit 125P. Thus, oil circuit 132P is able to easily form in the antetheca of right crankcase 21R.

As shown in figure 8, the surface for the cylinder block 23 that oil circuit 133P coordinates relative to each other and the surface of right crankcase 21R are oblique Extend forward.As described in Figure 7, right crankcase 21R have tubular rib 134, the tubular rib be formed on peripheral surface 21Rs and Extend to the right along peripheral surface 21Rs.Tubular rib 134, which has, is limited to oil circuit 134P therein, and the oil circuit is from oil circuit 133P's Middle section is to right branch.Oil circuit 134P has the connection open end on the mating surface 21Rsf of peripheral surface 21Rs 134a。

At the surface of cylinder block 23 and right crankcase 21R being fitted to each other, as shown in figure 8, oil circuit 133P is maintained as It is in fluid communication with oil circuit 135P, oil circuit 135P is limited in cylinder block 23 and along cylinder block 23 and right crankcase 21R Those mating surfaces extend, and arc upward around the cylinder body in cylinder block 23.Oil circuit 135P is then maintained as and oil circuit 136P is in fluid communication, and oil circuit 136P is limited in cylinder block 23 and is parallel to cylinder body axis Lc to be extended towards cylinder head 24. Oil is supplied to the valve operating gear in cylinder head 25 by oil circuit 135P and 136P from oil circuit 133P.

When right crankcase cover 22R covering right crankcase 21R make the mating surface 22Rsf of right crankcase cover 22R and right bent axle When the mating surface 21Rsf cooperations of case 21R, the connection open end of the discharge oil circuit 115P in right crankcase 21R as shown in fig. 8 The connection open end 134a of face 115a, the connection open end 131a of oil circuit 131P and oil circuit 134P distinguish in fluid-tight manner It is bonded to connection open end 125a, the outlet oil circuit of the entrance oil circuit 125P in the right crankcase cover 22R being shown in FIG. 10 The connection open end 141a of the connection open end 126a and oil circuit 141P of 126P, to which corresponding oil circuit is in stream each other Body is connected to.

Figure 15 is the stereogram of the oil circulation passage in internal combustion engine E (shown in the chain line in Figure 15).

As shown in figure 15, when oil pump 110 is activated, the oil that is stored in the fuel tank 100 of left and right crankcase 21L and 21R Oil guard 102 (oil guard removes the relatively large fragment in foreign matter) in outage 101 is and then by drawing oil circuit 105P is inhaled into oil pump 110.

Oil is discharged from oil pump 110 and flows into the entrance oil circuit being located in right crankcase cover 22R by discharging oil circuit 115P It in 125P, then flows on the peripheral surface of filter cell 123 of oil filter 120, and enters in filter cell 123, it should Filter cell is from the fractionlet filtered out in oil in foreign matter, such as mud and metal powder granulates.It is filtered to lead to afterwards spontaneously Cross outlet oil circuit 126P outflows.

Enter the oil circuit 131P in right crankcase 21R by exporting the oil of oil circuit 126P outflows, it is vertical to then pass through The oil circuit 132P that ground extends, and oil circuit 133P extended in longitudinal direction is entered by bending section.

Have flowed into the oil circuit entered from the oil in the oil circuit 134P that oil circuit 133P is branched out in right crankcase cover 22R 141P, and flow through bending part and flow into the oil circuit 142P in the radial rib 142 being located on rounded projections 22Rva, it is oily from the oil Road 142P is flowed into the bearing hole 143A being located in bearing 143.

With reference to Fig. 5, the oil stream for coming into bearing hole 143A enters in first axle in the right axle component 40R of bent axle 40 In oil circuit 40A, the annular space 75s being located in centrifugation formula oil filter 75 is then entered from branch oil circuit 40Aa.It is centrifuging When separate type oil filter 75 rotates, is mixed with oil and the foreign matter with big proportion detaches under the influence of centrifugal force, and mistake Oil after filter is flowed into the second axis by exporting oil circuit 61a in oil circuit 40B.

Then, by branch oil circuit 40Bb and along the inner peripheral surface of outer tube 54 out of second axis, oil circuit 40B flows oil, and And the inner peripheral surface of primary drive gear 53 is also flowed to by branch oil circuit 40Bc (Fig. 4), thus lubricate outer tube 54 and primary driving The relative rotation surface of gear 53 and right axle component 40R.Oil oil circuit 40B also out of second axis is flowed by branch oil circuit 40Bd To crank-pin 40p, the relative rotation surface of crank-pin 40p and connecting rod 43 are thus lubricated.

In order to execute maintenance to the centrifugation formula oil filter 75 as filter device, because it is accommodated in right bent axle In case cover 22R, so needing to remove right crankcase cover 22R from right crankcase 21R, centrifugation formula oil filter 75 is then removed Cover plate 76 must clear up the foreign matter being deposited in centrifugation formula oil filter 75 later.Therefore, to centrifuging formula oil filter 75 The maintenance work of progress is quite dull and time-consuming.

On the other hand, oil filter 120 by from right crankcase cover 22R it is outstanding in a manner of be arranged.By such as upper type to oil strain Device 120 is safeguarded：Bolt 124 is unloaded to remove lid 122 from filter housings 121, filter cell 123 is pulled out into filter Except shell 121, then new filter cell is put into filter housings 121, and using bolt 124 that lid 122 is tight Gu to filter housings 121.Thus, it is relatively easy to the maintenance work of oil filter 120.

During carrying out maintenance work to oil filter 120, integrally combined with bottom side backboard 151 and opening paranotum 152 Filter cell 123 can be drawn out except filter housings 121, it is specific as follows：Although in order to which oil filter 120 is made to Size is smaller and keeps the gap being located between opening paranotum 152 and the tubular inner peripheral surface of filter housings 121 fairly small, but by It is limited in the top of tubular inner peripheral surface of filter housings 121 in slot V, as shown in Figure 12 and Figure 13, a pair of of nipper plier The end of one of arm is inserted into slot V and is maintained as the outer of the radially-inwardly offset against opening paranotum 152 The region X (Figure 12) of the outer peripheral edge of portion annular ridge 152aa, and the end of another arm of the pair of nipper plier is maintained as diameter To the region Y (Figure 12) of the inner peripheral of the outer annular ridge 152aa out against offset.Outside the offset of opening paranotum 152 Portion annular ridge 152aa is clamped by the end of the arm of the pair of nipper plier now.Then, the outer annular ridge for keeping offset is utilized The pair of nipper plier of 152aa, by opening paranotum 152 and therefore by the pull-out filter housings 121 of filter cell 123 Except.

The oil filtering structure for internal combustion engine according to the present embodiment described above in detail provides the advantage that.

Although by filter housings by making the gap between filter housings 121 and filter cell 123 minimize 121 are made to that size is smaller, and an arm of clamping device is inserted into being limited at the tubular inner peripheral surface of filter housings 121 In slot V in, using the outer annular ridge 152aa of the offset of clamping device grasp opening paranotum 152, and can utilize folder Tool is held easily to pull out filter cell 123 except filter housings 121.Thus, it is possible to easily to oil filter 120 into Row is safeguarded.

As a result, oil filter 120 can be produced it is as small as possible so that the size of internal combustion engine E is smaller.

As shown in figure 11, since slot V is limited at the tubular for the filter housings 121 that center axis Lf is horizontally oriented In the top of inner peripheral surface, even if the arm of clamping device destroys when the arm of the clamping device is inserted into the slot V The region on the top of the tubular inner peripheral surface of filter housings 121 can also prevent the oil in filter housings 121 by being destroyed area It lets out in domain.

Due in axial direction observation (when observing in side view) time slot V and entrance oil circuit 125P along central axis Lf Alignment, as shown in figure 13, by drilling filter housings 121 to entrance axially along central axis Lf from its right open end Oil circuit 125P is able to easily form slot V.

As seen from Fig. 2, filter housings 121 be arranged in the rounded projections 22Rva of right crankcase cover 22R diameter it is outside Side and the neighbouring rounded projections, which laterally protrudes from the axial direction of bent axle 40, when along bent axle 40 When axial direction is observed, and entrance oil circuit 125P is limited at the portion of the neighbouring rounded projections 22Rva of filter housings 121 In point.Therefore, the oil circulation passage 20 in the engine case can be designed to be as short as possible, without leading to engine case 20 become large-sized.

Centrifugation formula oil filter 75 on the right axle component 40R (it is protruded from right crankcase 21R) of bent axle 40 It is accommodated in the rounded projections 22Rva of right crankcase cover 22R, as shown in Figure 2 and Figure 7.Thus, the neighbouring circle of oil filter 120 Shape lug boss 22Rva is accommodated in filter housings 121, physical interference does not occur with centrifugation formula oil filter 75.

Have been described above the oil filtering structure for internal combustion engine according to the present embodiment.However, should Understand, the present invention is not limited to the above-described embodiments, but can be made in the case of without departing from the scope of the present invention to it A variety of changes and modification.

Claims (5)

1. one kind being used for the oil filtering structure of internal combustion engine (E), which includes engine case (20), the engine Case has a pair of of crankcase (21L, 21R) and a pair of of crankcase cover (22L, 22R), and the crankcase is in a rotatable way Bent axle (40), the crankcase cover is supported to be used to cover the orientation along the bent axle (40) of the crankcase (21L, 21R) The corresponding side in direction, oil filter (120), which is mounted on the engine case (20) and has, is accommodated in filter housings (121) filter cell (123) in, wherein：

The filter cell (123) has hollow barrel-type shape；

The filter housings (121) are the tubular form with open end and blind end and are formed on described start On the outer wall of cabinet (20)；

It is closed by lid (122) open end for surrounding the filter housings (121) of the filter cell (123)；And And

There is the filter housings (121) slot (V), the slot to be limited in the tubular inner peripheral surface of the filter housings simultaneously And axially extend from the open end of the filter housings along the central axis (Lf) of the filter housings (121) Into the filter housings (121).

2. oil filtering structure according to claim 1, wherein the filter housings (121) are formed in the engine case (20) on outer wall so that the central axis (Lf) is flatly placed；And

The slot (V) is limited in the top of the tubular inner peripheral surface of the filter housings (121).

3. oil filtering structure according to claim 1 or 2, wherein the filter housings (121) have entrance oil circuit (125P), oil are flowed by the entrance oil circuit in the filter housings (121), and when along the central axis (Lf) Axial direction observation when the slot (V) be aligned with the entrance oil circuit (125P).

4. oil filtering structure according to claim 3, wherein the engine case (20), which has, to be located in the crankcase cover A crankcase cover (22R) on rounded projections (22Rva), the rounded projections (22Rva) are along the bent axle (40) axial direction protrudes；

When the axial direction observation along the bent axle (40), the filter housings (121) are disposed in the circle The radial outside of shape lug boss (22Rva) and the neighbouring rounded projections；And

The entrance oil circuit (125P) is limited at the neighbouring rounded projections (22Rva) of the filter housings (121) Part in.

5. oil filtering structure according to claim 4, wherein in the bent axle (40) from the crankcase (21L, 21R) Centrifugation formula oil filter (75) is provided on part outstanding, it is convex that the centrifugation formula oil filter (75) is located at the circle Play the axially inner side of portion (22Rva).