KR20080029804A - Oil passage structure - Google Patents

Abstract

In order to provide a manhour for assembly and a cost saving oil passage structure, the sealing performance of each oil passage on the divided surface of the crankcase is ensured, and each oil passage can be easily communicated, Can be prevented.

An oil outflow passage 72 and a main oil gallery 76 extending across a split surface of the crankcase substantially parallel to the crankshaft are provided, connecting the oil outflow passage 72 and the main oil gallery 76. The communication groove 75 is formed on the divided surface of at least one partition (left case half 21a) of the crankcase, and the endless seal member 78 integrally surrounding the outer periphery of the following is an oil outflow passage. 72, the main oil gallery 76, and each half body are provided in the mutually communicating communication grooves 75 on the divided surface.

Description

Oil passage structure {OIL PASSAGE STRUCTURE}

The present invention relates to an oil passage structure of an engine such as a motorcycle.

In the oil passage structure of the conventional type, when the oil passages divided in the dividing surface of the crankcase are interconnected, the oil passages are hermetically connected (eg, using a collar and a sealing member) (for example, See patent document 1).

[Patent Document 1] JP-A No. 2001-342816

If two divided oil passages of the crankcase are present on the split surface, it is necessary to have connecting passages separately for the two oil passages to communicate with each other, and another oil passage can be secured to easily complicate the engine. There is also the problem of being enlarged and increasing manhours to actuate the connection passages. There is also a need for two seal members to seal the split surface, resulting in increased incidence and cost for assembly.

The present invention provides an oil passage structure that reduces the incidence and cost for assembly, secures sealing performance of each oil passage on the split surface, and allows each oil passage to be easily communicated to avoid the enlargement of the engine. do.

Also shown is an oil passage structure in which oil passages are formed from both ends of the main oil gallery extending to each crank bearing in the axial direction of the crankshaft in the crankcase (see, for example, patent document 2). The engine oil supplied to each crank bearing is supplied around the camshaft through the cylinder and the cylinder head or around the connecting rod through the crankshaft.

[Patent Document 2] JP-A No. 2001-280111

In the oil passage structure described above, the engine oil passing through the oil filter enters the lubricating oil supply passage extending parallel to the crankshaft and is supplied to the crank bearing through the oil passage extending substantially perpendicular to the lubricating oil supply passage.

However, the engine oil must be supplied sufficiently evenly to each part, such as a crank bearing as well as a camshaft driven through a generator arranged inside the crank cover, a cylinder and a cam chain arranged on one side of the cylinder head. A simple compact layout is preferred, in which machining of a plurality of oil passages placed in each part, such as a generator and a camshaft, can also be simplified.

The present invention provides an oil passage structure in which engine oil can be sufficiently supplied evenly to each part of the engine, and a plurality of oil passages can be arranged simply and compactly.

In order to solve the problem, the invention according to claim 1 is characterized in that the crankcase (for example, the crankcase 21 of the embodiment) that supports the crankshaft (for example, the crankshaft 31 of the embodiment) is in the crank axial direction. First and second oil passages (e.g., based on an oil passage structure of the engine, which is divided into, and extend substantially parallel to the crankshaft across the dividing surface of the crankcase (e.g., dividing surface B1 of the embodiment) For example, the oil outflow passage 72 and the main oil gallery 76 of the embodiment; Communication grooves (e.g., communication grooves 75 of the embodiment) which connect each oil passage formed on the divided surface of at least one partition of the crankcase (e.g., the left case half 21a of the embodiment). )); And an endless seal member (eg, seal member 78 of the embodiment), which integrally surrounds the oil passage and is provided in the communication groove, each half of which is opposed to each other on the oil passage and the dividing surface.

In the invention according to claim 2, a cartridge-type oil filter (e.g. oil filter 68 in the embodiment) is attached to the side of the crankcase, the first oil passage being an oil outlet of the oil filter (e.g. Communication with the oil outlet 68d). The second oil passage communicates with the crank bearing of the crankcase (e.g., each crank bearing 36a, 36b of the embodiment).

In the invention according to claim 3, the oil passage structure of the engine (for example, the engine E of the embodiment) includes a cylinder (for example, the cylinder 32 of the embodiment) protruding from the crankcase; A cylinder head (eg, cylinder head 33 in the embodiment) attached to the end of the cylinder; A crankcase cover (for example, the right case cover 21c of the embodiment) covering one side of the crankcase; And a generator (e.g., generator 37 of the embodiment) arranged inside the crankcase. In addition, in the invention according to claim 3, the crankshaft (e.g., the crankshaft 52 of the embodiment) from one crank bearing (e.g., the left crank bearing 36a of the embodiment) through a cylinder and a cylinder head. A crankshaft lubricant supply passage (eg, the crankshaft lubricant supply passage 120 of the embodiment) for supplying engine oil to the outer periphery; Connecting rod lubricating oil supply passage for supplying engine oil to the outer circumference of the connecting rod (eg, connecting rod 35 of the embodiment) from another crank bearing (eg, right crank bearing 36b of the embodiment) via the crankshaft. (For example, connecting rod lubricant supply passage 48 of the embodiment); A generator lubricating oil supply passage (eg, the generator lubricating oil supply passage 46 of the embodiment) for supplying engine oil to the generator through the crankcase cover; And a main oil gallery (eg, main oil gallery 76 of the embodiment) that extends further to the outside of each crank bearing in the axial direction of the crankshaft. The main oil gallery includes a first oil passage (eg, a lubricant supply passage 42a in the left bearing of the embodiment) in communication with the camshaft lubricant supply passage; A second oil passage (for example, a lubricant supply passage 42b in the right bearing of the embodiment) in communication with the connecting rod lubricant supply passage; And a third oil passage (eg, generator side oil passage 44 of the embodiment) in communication with the generator lubricating oil supply passage.

In the invention according to claim 4, the cylinder is provided with a bolt insertion hole (for example, a bolt insertion hole 114 of an embodiment) for a stud bolt that fastens the cylinder and the cylinder head to the crankcase, The lubricating oil supply passage communicates with the cylinder from the crank bearing on the opposite side to the cam chain (e.g., cam chain 54 in the embodiment) through the bolt insertion hole, and the engine oil is connected to the sidewalls on the opposite side of the cam chain in the cylinder head. For example, the outer periphery of the camshaft through the oil passage in the head (e.g., the longitudinal axis oil passage 117 and the inclined oil passage 118 in the head) provided in the left sidewall 33b of the embodiment. Supplied to.

In the invention according to claim 5, an oil passage communicating with an upstream side of the main oil gallery (e.g., the oil outflow passage 72 of the embodiment) is a water jacket (e.g., the passage 74 of the embodiment). Coolant through the air).

In the invention according to claim 6, a cam chain and an oil pump drive chain (eg chain 85 of the embodiment) are provided between the generator side crank bearing (eg right crank bearing 36b of the embodiment) and the generator. do.

According to the invention as set forth in claim 1, the recognition and cost for assembly are reduced, and when the divided portions on the divided surface of each oil passage are sealed, the grooves communicate with the divided portions on the divided surface of each oil passage with an endless seal member. By sealing together integrally, the seal performance on the divided surface of each oil passage can be ensured. Since each oil passage can be easily communicated only by forming a communication groove on the divided surface of the crankcase, the oil passage structure can be simplified, the degree of freedom of the layout of each oil passage can be improved, and the engine size can be avoided. This can reduce the incidence of connecting passage work.

According to the invention set forth in claim 2, when the oil inlet of the oil filter is arranged opposite the outlet of the oil pump, the second oil is the first oil passage communicating with the oil outlet of the oil filter and the main oil gallery communicating with the crank bearing. The passages can be arranged apart, but since each oil passage can be easily communicated even in this case, an efficient oil passage structure can be formed, and the freedom of layout of each oil passage can be improved.

According to the invention set forth in claim 3, the first oil passage for supplying oil to the outer circumference of the camshaft, the second oil passage for supplying oil to the outer circumference of the connecting rod, and the third oil passage for supplying oil to the generator are the main oil. Since branching directly from the gallery, the winding of the oil passages can be reduced, the flow resistance can be reduced, the circulation of oil can be increased, the engine oil can be supplied evenly to each part of the engine, and a plurality of oils The passage can be simply miniaturized and arranged. Machining for forming a plurality of oil passages can be simplified.

According to the invention set forth in claim 4, the camshaft lubricant supply passage portion can be easily formed using the bolt insertion hole of the cylinder. Lubrication of the camshaft end can also be facilitated by providing an oil passage to the head of the camshaft lubricant supply passage on the side wall of the cylinder, and the oil passage in the head can be arranged simply and compactly. In addition, interference of the cam chain or the like is prevented by providing an oil passage in the head of the camshaft lubricant supply passage in the side wall on the opposite side of the cam chain in the cylinder head, and the oil passage in the head can be easily formed.

According to the invention set forth in claim 5, the engine oil is cooled by a water jacket upstream of the main oil gallery, engine oil of relatively low temperature can be supplied to each part of the engine, and the engine cooling performance can be improved. .

According to the invention set forth in claim 6, since each chain wound on the camshaft is collected on one side, the mobility of each chain assembly can be improved, and since each chain is provided on the generator side, the oil chamber space can be concentrated.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, directions such as front, back, right and left are similar to the direction of the vehicle unless otherwise noted. Arrow FR in the figure points to the front side of the vehicle, arrow LH points to the left side of the vehicle, and arrow UP points to the upper side of the vehicle.

In the scooter type motorcycle, which is a low deck vehicle shown in FIG. 1, the body frame F is provided with a head pipe 13 at its front end, and is steered with a front fork 11 connected to the front wheel WF. The handle 12 is supported to be steerable by the head pipe 13. On the lower side of the rear part of the body frame F, the engine E which is a power plant of the motorcycle 1 is arranged in the front, and the integrated swing type power which the axle S of the rear wheel WR which is a drive wheel is arranged in the back. Units (hereinafter referred to as swing units) are arranged.

The lower side of the front surface of the swing unit U is supported to be swingable in the vertical direction by the rear portion of the vehicle body frame F via the link member 61. On the other hand, the rear end of the swing unit U is supported by the rear end of the vehicle body frame F through the rear cushion 7 which is a shock absorber. The swing unit U can swing in the vertical direction together with the rear wheel WR because the link member 61 functions as a pivot and a so-called unit swing type rear suspension is configured.

The body frame F has a pair of left and right upper down frames 14 extending downwardly from the head pipe 13 and rearwards from the head pipes 13 below the upper down frame 14. A pair of left and right lower down frames 15 extending diagonally downward and then bent backwards are provided. The rear part of the lower down frame 15 is the rear inclination part 15a extended and bent upward diagonally upward, and the rear end of each upper down frame 14 is joined to the lower side of each rear inclination part 15a.

The front ends of each of the pair of left and right seat rails 16 inclined upward rearward are joined to the rear of each upper down frame 14, and the upper end of each rear slope 15a is each seat rail. It is joined to the intermediate part of (16). The support frame 10 which functions as a diagonal strut is arrange | positioned between the rear part of each seat rail 16 and the intermediate part of each rear inclination part 15a. The vehicle body frame F is mainly formed by the head pipe 13, the upper down frame 14, the lower down frame 15, the seat rail 16, and the support frame 10.

The circumference of the vehicle body frame F is covered with the vehicle body cover 19. A passenger tandem seat 20 is arranged on the upper side of the rear of the vehicle body cover 19 so that the seat can be lifted. An article storage box 18 for accommodating a helmet or the like is disposed on the lower side of the occupant seat 20 and the upper side of the power unit U.

The swing unit U integrates the engine E at the front and the power transmission mechanism M at the rear left.

In the engine E, the rotational axis C1 of the crankshaft 31 is arranged laterally (in the width direction of the vehicle) and the cylinder portion 22 is substantially horizontal from the front end at all of the crankcase 21. It is a water-cooled four-stroke OHC single-cylinder engine that protrudes (in detail, tilted slightly upward in front). Reference numeral C2 denotes an axis (cylinder axis) of the cylinder portion 22.

As shown in FIG. 2, the crankcase 21 is divided into left and right case halves 21a and 21b. After the vehicle body has fallen from the left side to the left side of the rear side, the left case body 23a extending rearward is integrated with the left case half 21a of the crankcase 21. The left case half body 23a forms the transmission case 23 in the power transmission mechanism M together with the left case cover 23b attached to the left side of the left case body. The right case cover 21c is attached to the right side of the right case half 21b of the crankcase 21, and the generator 37 has a crankshaft 31 coaxially provided inside the right case cover 21c. Reference numeral B1 denotes a split surface perpendicular to the lateral direction at the center of the crankcase 21 in the lateral direction (the position of the cylinder axis C2).

In the power transmission mechanism M, the output of the belt continuously variable variable transmission 24 and the continuously variable transmission mechanism 24 for continuously moving the driving force of the engine E are reduced and the axle S is reduced. A speed reducing gear train (not shown) is provided. The belt-type continuously variable transmission mechanism 24 is accommodated in the longitudinal direction of the transmission case 23, and the reduction gear train is accommodated in the right side of the rear part of the transmission case 23 (inside of the vehicle body width direction). The axle S protrudes to the right from the reduction gear train, and the rear wheel WR is attached to the axle S.

The cylinder portion 22 mainly includes a cylinder 32 attached to the full end of the crankcase 21, a cylinder head 33 attached to the full end of the cylinder 32, and a full end of the cylinder head 33. It is comprised by the attached head cover 33a.

The piston 34 is fastened to reciprocate the cylinder 32. The small diameter end 35b of the connecting rod 35 is coupled to the piston 34 through the piston pin, and the large diameter end 35a of the connecting rod 35 is the crank pin 31e of the crankshaft 31. ) Is combined. The left and right journals 31a and 31b of the crankshaft 31 are left and right crank bearings formed by the left and right inner walls 41a and 41b of the left and right case halves 21a and 31b via metal bearings (plane bearings) 39a and 39b. Rotatably supported by 36a, 36b.

The rotational power of the crankshaft 31 is transmitted to the axle S through the power transmission mechanism M.

In the belt type continuously variable transmission mechanism 24 of the power transmission mechanism M, the V-belt 103 is wound around the driving pulley 101 and the driven pulley 102, and the reduction ratio for the rotational power is the crankshaft 31. In accordance with the change in the rotational speed of changes continuously in a predetermined range. The drive pulley 101 is arranged coaxially with the crankshaft 31 in all of the transmission case 23, and the driven pulley 102 is arranged behind the drive pulley, that is, at the rear of the transmission case 23.

The generator shaft 31c further extends to the right from the right journal 31b on the right side of the crankshaft 31 and supports the outer rotor 37a of the generator 37 accommodated in the right case cover 21c. The outer rotor 37a is a cup shape opened to the right, and the stator coil 37b supported by the right case cover 21c is disposed in the outer rotor 37a.

A drive sprocket 51 for driving the camshaft 52 in the cylinder head 33 is provided coaxially to the base side of the generator shaft 31c. A drive sprocket 82 for driving the oil pump 81 (see FIG. 3) is provided near the left side of the drive sprocket 51. A gear 37c connected to the starter driven by a not shown starter is also attached to the right side of the outer rotor 37a of the generator 37 via the one-way clutch 37d.

The camshaft 52 is disposed in parallel with the crankshaft 31 (ie in the lateral direction) in the cylinder head 33, and both sides are rotatably supported by the cylinder head 33. The driven sprocket 53 is provided coaxially to the left end of the camshaft 52, and the camshaft 52 has a cam chain 54 in which the driven sprocket 53 and the drive sprocket 31 of the crankshaft 31 are driven. 51, and rotates in synchronization with the crankshaft (31). The cam chain chamber 55 containing the cam chain 54 is provided on the right side of the cylinder head 33 and the cylinder 32.

The intake and exhaust cams 52a and 52b are juxtaposed to the middle portion in the lateral direction of the camshaft 52, and the input ends of the rocker arms 56a and 56b on the intake side and the exhaust side are adjacent to the intake and exhaust cams 52a and 52b. . When the camshaft 52 rotates as described above, each rocker arm 56a, 56b swings according to the cam pattern of the intake and exhaust cams 52a, 52b, and an intake and exhaust valve, not shown, is operated, and the cylinder head 33 The intake and exhaust ports of the door are opened and closed. Reference numeral 38 denotes a spark plug.

The left side of the crankshaft 31 further extends from the left journal 31a to the left side to form a drive pulley shaft 31d, and the drive pulley shaft 31d is a drive pulley of the belt type CVT 24. The drive pulley can rotate integrally with the support 101. In the drive pulley 101, the fixed pulley half body 101a which is located outside in the axial direction of the drive pulley shaft and fixed to the drive pulley shaft 31d and moves inward in the axial direction and moves on the drive pulley shaft 31d in the axial direction. Movable pulley half body 101b is provided. The V-belt 103 is wound around a V-shaped groove 101c formed between both pulley halves 101a and 101b. The moving pulley half body 101b is pressed to the side from which the moving pulley half body is separated from the fixed pulley half body 101a. A plurality of weight rollers are disposed inside the moving pulley half body 101b.

When the rotation of the drive pulley 101 stops (when the rotation of the crankshaft 31 stops), the moving pulley half body 101b is separated from the fixed pulley half body 101a, and the width of the V-shaped groove 101c is It extends, and the position where the V belt 103 is wound moves inside. When the driving pulley 101 rotates (when the crankshaft 31 rotates), each weight roller 104 moves outward by centripetal force, and the moving pulley half body 101b is closer to the fixed pulley half body 101a. The width of the V-shaped groove 101c is narrowed, and the position in which the V belt 103 is wound moves outward. In accordance with the change of the wound position, the position where the V belt 103 is wound on the drive pulley 102 also changes, and the reduction ratio between both pulleys 101 and 102 automatically changes continuously.

The cooling fan 107 is formed on the left side of the driving pulley 101, and rotates together with the driving pulley 101 when the engine is driven. Accordingly, in the transmission case 23, outside air flows in from the intake port 23e of the suction pipe 23c attached to the left side of the entire transmission case 23, and forced cooling of the belt type continuously variable transmission mechanism 24 or the like. This is done. In the intake pipe 23c, the engine intake passage is provided separately from the transmission cooling wind passage.

The cartridge type oil filter 68 is attached to the lower left side of the crankcase 21 (left case half 21a) (Fig. 1).

As shown in Fig. 3, the oil filter 68 accommodates a member in a cylindrical case 68a lying on the bottom, and the opening of the case 68a is closed by a disc shaped set plate 68b. As for the case, the left side wall of the crankcase 21 (left case half 21a) has the center axis of the case 68a in the lateral direction (axial direction of the crankshaft), and the opening side of the case 68a. It is arranged to face the holder 71 of 21d).

The oil outlet 68d is formed at the center and the periphery of the set plate 68b, and the plurality of oil inlet ports 68c are disposed in the circumferential direction. After the oil filter 68 receives the engine oil flowing into the case 68a from each oil inlet port 68c, the oil is sent from the outside of the member to the inside and filtered, and the oil is casing at the oil outlet 68d. It is made to flow out 68a. Reference numeral 69 denotes an oil sensor for detecting oil temperature or oil pressure in the vicinity of the oil filter 68 on the left wall 21d of the crankcase 21, and 69a indicates an internal pressure in the crankcase 21. Represents a breather pipe to be adjusted.

Right in the lateral direction substantially parallel to the crankshaft 31 (substantially parallel to the crankshaft C1) from the center of the holder 71 (the part opposite the oil outlet 68d of the oil filter 68) An oil outflow passage 72 extending inwardly (inward in the lateral direction) is formed in the crankcase 21. The oil filter 68 protrudes the nozzle 72a in communication with the oil outflow passage 72 from the center of the holder 71 to the left side, so that the threads outside the nozzle 72a and the internal threads of the oil outlet 68d are removed. It is attached to the holder 71 by screwing and rotating around the axis and fastening the oil filter 68 so that the oil outflow passage 72 and the oil outlet 68d may communicate.

An annular oil groove 71a is formed opposite each oil inlet port 68c of the oil filter 68 on the holder 71. A part of the oil groove 71a faces the discharge pod of the oil pump 81 in the lateral direction, and the oil passage 73 on the discharge side is formed in the crankcase 21 in the lateral direction, so that the oil groove 71a and The exhaust pod is connected at the shortest distance.

The oil pump 81 which purifies engine oil is arrange | positioned so that the drive shaft 83 may lie in the lateral direction inside the lower part of the right case half 21b. The driven sprocket 84 is provided coaxially to the drive shaft 83 of the oil pump 81, and the oil pump 81 has an endless chain on the driven sprocket 84 and the drive sprocket 82. 85 is wound and rotated in connection with the crankshaft (31).

In the water pump 86 for circulating the engine cooling water, the drive shaft 87 is disposed coaxially with the drive shaft 83 of the oil pump 81 on the right side of the lower portion of the right case half 21b. The left end of the drive shaft 87 of the water pump 86 is engaged with the right end of the drive shaft 83 of the oil pump 81, so that relative rotation is impossible, and when the oil pump 81 is driven, water The pump 86 is similarly driven. Cooling water from the water pump 86 flows into the cylinder portion 22 from the left side of the crankcase 21 through the cooling water connecting passage 74 across the left and right case halves 21a and 21b. The coolant connecting passage 74 is arranged near the oil outflow passage 72. Reference numeral 58 denotes an engaging portion on the unit side that engages the link member 61 on the full lower portion of the swing unit U.

The oil passage 73a on the suction side in communication with the oil pan at the bottom of the crankcase 21 is connected to the suction opening of the oil pump 81, and the oil inlet port 68c of the oil filter 68 Is connected to the discharge port of the oil pump 81.

When the oil pump 81 is driven, the engine oil stored in the oil pan is sucked into the oil pump 81 through the suction side oil passage 73a formed in the right case half 21b, and discharged from the oil pump 81. Oil flows into the oil groove 71a of the holder 71 through the discharge side oil passage 73 across the left and right case halves 21a and 21b, and through each oil inflow port 68c through the oil groove 71a. Flows directly into the oil filter 68.

The oil filtered through the oil filter 68 flows directly from the oil outlet 68d into the oil outlet passage 72 through the nozzle 72a. The oil outflow passage 72 is provided across the left and right case halves 21a and 21b (specifically, so that its right end reaches the right case half 21b). The right end of the oil outflow passage 72 traverses the left and right case halves 21a and 21b of the crankcase 21 through the communication groove 75 concave on the divided surface B1 of the right case half body 21b. The stalk communicates with the lateral middle portion of the main oil gallery 76 extending substantially parallel to the crankshaft 31. That is, oil flowing into the oil outflow passage 72 flows into the middle portion of the main oil gallery 76 through the communication groove 75. The communication groove 75 may be formed in the left case half 21a, or may be formed in the left and right case halves 21a and 21b.

As shown in FIG. 6, the endless single seal member 78 integrally surrounding the outer periphery is the main oil gallery 76, the oil outflow passage on the divided surface B1 of the left and right case halves 21a and 21b. 72, and communication groove 75 is provided in the opposing parts. That is, the seal member 78 surrounds the outer circumference of the communication portion including the main oil gallery 76, the oil outflow passage 72, and the communication groove 75 on the split surface B1 along the outer circumference, and the left and right case half ( When 21a, 21b) are integrally assembled, the communicating portion is easily and stably sealed.

As shown in FIG. 7, the divided portions on the dividing surface B1 of the main oil gallery 76 and the oil outflow passage 72 are connected through respective collars 76c and 72c. The part on the outer periphery of the above-mentioned communication part in the left case half body 21a is a recessed part which reverse boring was made, and the sealing member 78 is fastened to the groove formed by this recessed part and the outer periphery of each color, and the communication part is divided | segmented. It is. The wall 75a in the longitudinal direction of the communication groove protrudes from both sides in the width direction of the communication groove 75, and the seal member 78 is fastened to the groove formed by the wall 75a and the recessed portion. Is divided. The outer circumference of the communicating portion in the right case half 21b has no curved and flat sealed face. The divided portions on the split surface B1 of the discharge side oil passage 73, the coolant connecting passage 74, and the relief passage 77 are connected through the respective colors 73c, 74c1, 77c, and It is sealed by individual seal members (O rings) 73d, 74d1, 77d provided on the outer circumference (see FIGS. 3, 5, 6).

As shown in Fig. 3, the lubricating oil supply passages in the left and right bearings 42a and 42b formed in the left and right inner walls 41a and 41b forming the left and right crank bearings 36a and 36b in the left and right case halves 21a and 21b are It is connected to both the left and right ends of the main oil gallery 76. Lubricant supply passages 42a and 42b in the left and right bearings extend substantially perpendicular to the crankshaft 31 (crankshaft C1), and the lubricant supply grooves 43a and 43b in the left and right crank bearings 36a and 36b. Communicate with For this reason, the engine oil which flows into the main oil gallery 76 is supplied to the sliding surface of the left-right metal bearings 39a and 39b.

The left end of the main gallery 76 extends to the left of the left inner wall 41a (left crank bearing 36a), and the sensing member of the oil sensor 69 faces the left end. On the other hand, the oil passage 44 on the generator side extending substantially parallel to the crankshaft 31 is connected to the right end of the main oil gallery 76 on the right side of the right inner wall 41b. The generator side oil passage 44 communicates with the oil passage in the cover 45 formed in the right case cover 21c.

An oil injection port 45a facing the generator 37 inside the right case cover 21c is suitably formed in the oil passage in the cover 45. For this reason, a part of the oil in the main oil gallery 76 is supplied to the generator 37 via the oil passage 44 on the generator side and the oil passage in the cover 45. The cover 45 in the cover is hereinafter referred to as generator lubricating oil supply passage 46.

The divided portions of the oil passage 44 on the generator side and the oil passage in the cover 45 on the split surface (fastening surface) perpendicular to the lateral direction between the right case half 21b and the right case cover 21c are: It is connected via the collar 44c and sealed by the seal member (O ring) 44d provided on the outer periphery of the collar. The divided portions of the coolant connecting passage 74 on the divided surface are connected via the collar 74c2 and sealed by a seal member (O ring) 74d2 provided on the outer circumference of the collar.

A part of the oil supplied to the left crank bearing 36a passes through an oil passage 79 (see Fig. 5) on the cylinder side formed in the left case half 21a or the like (in Fig. 5) to the valve train of the cylinder head 33 (in the valve chamber). valve train). The oil in the cylinder head 33 is returned to the oil pan at the bottom of the crankcase 21 via the cam chain chamber 55 on the right side of the cylinder portion 22. The inside of the crankcase 21 and the inside of the transmission case 23 are divided so as not to leak oil, and no oil is supplied to the belt-type continuously variable transmission mechanism 24 at all. Reference numeral 39c denotes an oil seal disposed outside the axial direction of the left crank bearing 36a, and seals the left crank bearing 36a and the left journal 31a so that oil does not leak.

On the other hand, a part of the oil supplied to the right crank bearing 36b passes through the oil hole 47a which drills the right journal 31b of the radial crankshaft 31 to the large diameter end 35a of the connecting rod 35. It is supplied to the sliding surface of the inner metal bearing, the oil hole 47b radially drills the crank pin 31e, and the oil hole 47c connects each oil hole 47a, 47b diagonally.

That is, the connecting rod lubricating oil supply passage 48 comprised by each oil hole 47a, 47b, 47c which supplies engine oil is mainly formed in the vicinity of the connecting rod 35 from the right crank bearing 36b. Annular grooves for making the flow of oil are formed in the outer circumference of the right journal 31b and the inner surface of the right metal bearing 39b, respectively. A part of the oil supplied to the large diameter end 35a of the connecting rod 35 is supplied through the inside of the connecting rod 35 to the sliding surface of the metal bush inside the small diameter end 35b.

As shown in FIG. 4, the oil pump 81 is disposed in front of the diagonally lower side of the crankshaft 31 (crankshaft C1) in the right case half 21b. A relief passage 77 extending substantially parallel to the crankshaft 31 across the left and right case halves 21a and 21b is disposed on the left side of the relief port of the oil pump 81.

As shown in Fig. 5, the holder 71 (oil filter 68) is disposed in front of the diagonally lower side of the crankshaft 31 on the left wall 21d of the left case half 21a. An oil outflow passage 72 in communication with the oil groove 71a of the holder 71 is disposed on the left side of the discharge port of the oil pump 81.

The coolant connecting passage 74 across the discharge side oil passage 73, the oil outflow passage 72, the relief passage 77, the main oil gallery 76, and the left and right case halves 21a and 21b is a crankcase ( 21 are intensively disposed in front of the diagonally lower side of the crankshaft 31. The endless seal member 78 which integrally encloses the following outer periphery has a main oil gallery 76, an oil outflow passage 72, and each half body on the divided surfaces B1 of the left and right case halves 21a and 21b. It is provided in the opposing communication groove 75 (see FIG. 5).

As shown in Figs. 6 and 8 (a), the space (crank arrangement space) K where the crankshaft 31 is disposed in the crankcase 21 and the oil pan P in the lower part of the crankcase 21 are shown. A reed valve 91 for dividing) is provided behind the diagonally lower side of the crankshaft 31 in the left case half 21a. The reed valve 91 is a substantially horizontal plate, a frame plate 92 having a square communication hole 92a at the center, an elastic plate 93 fixed at one side to a lower surface of the frame plate 92, and a frame. The sealing member 94 covering the outer circumference of the plate 92 is integrated.

The rectangular elastic plate 93 is larger than the communication hole 92a, and the short-side portion on the full side thereof is fixed to the frame plate 92 by a pair of screws 95. The elastic plate 93 closes the communication hole 92a when the load is not applied and when the load is applied from the lower side, and opens the communication hole 92a by bending downward when the load is applied from the upper side. For this reason, the reed valve 91 is suitably opened and closed in accordance with the change of the internal pressure of the crank arrangement space K by the reciprocating motion of the piston 34, the friction is reduced, and the engine oil in the crank arrangement space K. May be circulated to the oil pan (P). That is, when the pressure in the crank arrangement space K is changed by the operation of the engine E, the reed valve 91 is intermittently opened and closed, so that the oil in the crank arrangement space K is downward, that is, the oil pan P ) To flow into.

The cutout 97, which is U-shaped in plan view, opened on the split surface B1 side, divides the left side to divide the crank arrangement space K and the oil pan P in the left case half 21a. It is provided on the wall 96a. The cross section opened inside the cutout 97 of the inner circumference of the cutout 97 is U-shaped, and the reed valve 91 having the seal member 94 on the outer circumference thereof is supported inside the cutout in a sealed state. do. One side of the reed valve 91 opposes the divided surface B1, and one side of the right dividing wall 96b of the right case half body 21b is adjacent to this one in a sealed state.

The reed valve 91 is substantially rectangular in plan view, and the pair of corners on the depth side of the cutout 97 opposite to the pair of corners on the split surface B1 form an arc shape having a relatively large radius. do. In the case of each corner on the depth side of the cutout 97 of the reed valve 91, the rear corner opposite the front corner is shaped into an arc with a larger radius. Because of this, when the flat reed valve 91 is attached to the crankcase 21, wrong assembly such as attachment of the reed valve 91 in the wrong direction is prevented.

The vertical width (height of each screw 95) of the part fixed to the elastic plate 93 on the rear side of the reed valve 91 is larger than the vertical width inside the U-shaped region of the inner circumference of the cutout 97. The depth of the U-shaped region on the rear side of the cutout 97 is set longer than the depth of the U-shaped region on the front side of the cutout 97. For this reason, even if the assembly direction of the reed valve 91 in the cutout 97 is wrong as shown in FIG. 8 (b), each screw 95 obstructs the inner circumference of the rear side of the cutout 97, and The valve is not fastened to the cutout to prevent incorrect assembly of the reed valve 91.

As described above, the oil passage structure corresponding to the above-described embodiment is based on the oil passage structure of the engine E in which the crankcase 21 supporting the crankshaft 31 is divided in the crank axial direction, An oil outflow passage 72 and a main oil gallery 76 extending across the dividing surface B1 of the crankcase 21 substantially parallel to the crankshaft 31, respectively, are provided with an oil outflow passage 72. The communication groove 75 connecting the main oil gallery 76 and the main oil gallery 76 is formed in the divided surface B1 of at least one partition (left case half 21a) of the crankcase 21, and the oil outflow passage 72 The endless seal member 78, the main oil gallery 76, and the communication groove 75 integrally surrounding the outer circumference of the head) are provided such that the oil outflow passage, the main oil gallery, and each half face each other at the split surface B1. Is provided in the communication groove.

According to this configuration, if the divided portions on the dividing surface B1 of the oil outflow passage 72 and the main oil gallery 76 are sealed, the incidence and cost for assembly can be saved, and the endless seal member 78 By sealing them integrally together with the communication groove 75, it is possible to ensure the sealing performance to the divided surface (B1) of the oil outflow passage 72 and the main oil gallery (76). In addition, since the oil outflow passage 72 and the main oil gallery 76 can be easily communicated with each other by forming the communication groove 75 in the divided surface B1 of the crankcase 21, the oil passage structure becomes The simplification, the freedom of layout of each oil passage can be improved, the avoidance of large engines, and the man-hour of manipulating the connecting passage can be reduced.

Further, in the oil passage structure, a cartridge type oil filter 68 is attached to the crankcase 21 side, the oil outflow passage 72 communicates with the oil outlet 68d of the oil filter 68, and the main oil gallery ( 76 communicates with each of the left and right crank bearings 36a and 36b of the crankcase 21.

According to this configuration, when the oil inlet port 68c of the oil filter 68 is disposed opposite the discharge port of the oil pump 81, the oil outflow passage communicating with the oil outlet 68d of the oil filter 68 ( 72 and main oil gallery 76 communicating with the left and right crank bearings 36a and 36b may be arranged separately, but in this case, the oil outflow passage 72 and the main oil gallery 76 may also be easily communicated. As such, an efficient oil passage structure can be formed, and the freedom of layout of each oil passage can be improved.

As shown in Figs. 9 and 10, a coolant inlet 112 (see Fig. 11), which is part of the jacket 111 in the cylinder 32, is provided below the front end of the left case half 21a. The left end of the cooling water connecting passage 74 is connected to the cooling water introduction portion 112, and the cooling water introduction portion is opened to the cylinder engagement surface (surface for locking the base of the cylinder 32) T1 in the left case half 21a. . The coolant flows into the jacket 111 surrounding the circumference of the cylinder inner diameter in the deck-shaped cylinder 32 opened through the coolant inlet 112.

The coolant inlet 112 extends rearward, so that the coolant inlet approaches the discharge side oil passage 73 and the oil outflow passage 72 located behind the coolant inlet, respectively, and the discharge side oil passage 73 and the oil outlet passage. Since the extended portion 112a is provided between the 72, the cooling performance of the engine oil circulating in the crankcase 21 is improved. After the coolant in the jacket 111 of the cylinder 32 flows into the jacket of the cylinder head 33 from the end face (surface for fastening the base of the cylinder head 33) T2 of the cylinder 32, The coolant is returned to the water pump 86 from the coolant outlet 113 on the upper right side of the cylinder head 33 via a radiator (not shown) (see FIG. 12).

As shown in FIGS. 11 and 12, bolt insertion holes 114 for inserting an unshown stud bolt extending forward from the crankcase 21 along the cylinder axis C2 are upper and lower sides of the cylinder 32. The left and right sides of each are provided. Similarly, bolt insertion holes 115 corresponding to respective bolt insertion holes 114 are provided on the upper side and the lower side of the cylinder head 33, respectively. The cylinder 32 and the cylinder head 33 are integrally fixed to the crankcase 21 by inserting stud bolts into the bolt insertion holes 114 and 115, and fastening and tightening nuts to the bolts from the valve chamber side. do.

As shown in Fig. 13, the cylinder side oil passage 79 of the left case half 21a is opened on the upper left side of the cylinder engagement surface T1. On the other hand, the bottom surface communication groove 116 which forms the insertion hole 114 of the upper left side, and the cylinder side oil passage 79 is formed in the base surface of the cylinder 32. As shown in FIG.

In the cylinder head 33, a longitudinal axis oil passage 117 in the head extending along the cylinder axis C2 from the base of the cylinder head 33 to the height of the axis C3 of the camshaft 52 has a left wall 33b. The inclined oil passage 118 in the head, which is formed in the vicinity of the bolt insertion hole 115 in the upper left side in the top, and is inclined with respect to the axis C3 and extends in a straight line when viewed in the cylinder axial direction, is the longitudinal axis oil passage in the head. It is formed from the end of 117 to the left cam bearing 121 which supports the left end of the cam shaft 52. As shown in FIG. The longitudinal axis oil passage 117 in the head and the inclined oil passage 118 in the head are located on the left side of the cylinder head 33, that is, on the opposite side of the cam chain 54, so that the cam chain 54 and the driven sprocket 53 are positioned. ) Is not affected.

An end side communication groove 119 is formed in the end face T2 of the cylinder 32 to allow the bolt insertion hole 114 on the upper left side to communicate with the longitudinal axis oil passage 117 in the head side head. Therefore, a part of the oil supplied to the left crank bearing 36a is in the cylinder side oil passage 79, the bottom side communication groove 116, the bolt insertion hole 114, the end side communication groove 119, the longitudinal axis in the head. After the oil passage 117 and the inclined oil passage 118 in the head into the left cam bearing 121, a part of the oil flows into the interior space from the left end of the camshaft 52, and then the interior space It is supplied appropriately to each sliding portion of the valve train and the like through.

That is, the bolt insertion hole 114 in the upper left side of the cylinder 32 functions as the in-cylinder longitudinal oil passage 114a which supplies engine oil to a valve train. The camshaft lubricating oil supply passage 120 for supplying engine oil from the left crank bearing 36a to the circumference (valve train) of the camshaft 52 is mainly a cylinder side oil passage 79 and an in-cylinder longitudinal oil passage 114a. (Bolt insertion hole 114), the longitudinal axis oil passage 117 in the head, and the inclined oil passage 118 in the head (FIG. 2).

Therefore, as described above, the oil passage structure corresponding to the present embodiment is the oil passage structure of the engine E provided with the crankcase 21 supporting the crankshaft 31, the cylinder protruding from the crankcase 21. (32), the cylinder head 33 attached to the end of the cylinder 32, the right case cover 21c covering one side of the crankcase 21, and the generator 37 disposed inside the crankcase 21. Is based. Further, in the oil passage structure corresponding to the present embodiment, the camshaft lubricating oil supply passage 120 and the crankshaft for supplying engine oil around the camshaft 52 from the left crank bearing 36a via the cylinder 32. Engine oil to the generator 37 via the connecting rod lubricant supply passage 48 and the right case cover 21c which supply engine oil from the right crank bearing 36b to the connecting rod 35 through the 31. The generator lubricating oil supply passage 46 for supplying the oil is provided with a main oil gallery 76 extending further outside of each crank bearing 36a, 36b in the axial direction of the crankshaft, and the main oil gallery 76 is a cam. The lubricant supply passage 42a in the left bearing in communication with the shaft lubricant supply passage 120, the lubricant supply passage 42b in the right bearing in communication with the connecting rod lubricant supply passage 48, and the generator lubricant supply passage 46 year Branches to the generator-side oil passage 44 that.

According to the above-described configuration, the lubricating oil supply passage 42a in the left bearing for supplying oil around the camshaft 52, the lubricating oil supply passage 42b in the right bearing for supplying oil around the connecting rod 35, And since the generator side oil passage 44 supplying oil to the generator branches directly from the main oil gallery 76, the winding of the oil passage can be reduced, the flow resistance can be reduced, the amount of circulation of the oil is increased, Engine oil can be supplied to each part of the engine in a balanced manner, and a plurality of oil passages can be arranged simply and compactly. In addition, machining for forming a plurality of oil passages can be simplified.

In the case of the oil passage structure, the cylinder 32 is provided with a stud bolt insertion hole 114 for fastening the cylinder 32 and the cylinder head 33 to the crankcase 21, and the camshaft lubricant oil. The supply passage 120 communicates with the cylinder head 33 from the left crank bearing 36a on the opposite side of the cam chain 54 via the bolt insertion hole 114, and the engine oil is the cam chain in the cylinder head 33. It is supplied around the camshaft 52 via the in-head longitudinal axis oil passage 117 and the head inclined oil passage 118 provided in the right crank bearing 36b on the opposite side to 54, respectively.

According to the above-described configuration, a part of the camshaft lubricant supply passage 120 can be easily formed using the bolt insertion hole 114 of the cylinder 32. Further, lubrication of the end of the camshaft 52 can be facilitated by providing the longitudinal head oil passage 117 and the inclined oil passage 118 in the head to the left wall 33b of the cylinder head 33 respectively. The longitudinal oil passage 117 in the head and the inclined oil passage 118 in the head can be simply compactly arranged. Further, the longitudinal shaft oil passage 117 in the head and the inclined oil passage 118 in the head are connected to the camshaft lubricating oil supply passage 120 in the left side wall 33b opposite the cam chain 54 in the cylinder head 33. By providing each, it is possible to prevent the cam chain 54 or the like from interfering, and the longitudinal axis oil passage 117 in the head and the inclined oil passage 118 in the head can be easily formed.

Further, in the above-described oil passage structure, the oil outflow passage 72 communicating with the upstream side of the main oil gallery 76 is disposed near the cooling water connecting passage 74 so that the upstream cooling water connection of the main oil gallery 76 is connected. Since the engine oil is cooled by the passage 74, relatively low temperature engine oil is provided to each part of the engine, and the engine cooling performance can be improved.

In addition, in the oil passage structure, since the cam chain 54 and the oil pump drive chain 85 are provided between the right crank bearing 36b and the generator 37 on the generator 37 side, it is wound on the crankshaft 31. Each chain 54, 85 is gathered on one side, the operability of each chain 54, 85 assembly can be improved, and the oil chamber space is provided by providing each chain 54, 85 on the generator 37 side. Can be enhanced.

The present invention is not limited to the above-described embodiments, and may be applied to, for example, an engine other than a unit swing type, a multi-cylinder engine, or a DOHC engine, and the present invention is a motorcycle and a three or four wheel except a scooter. Needless to say, the present invention can be applied to a vehicle, and various modifications are allowed without departing from the object of the present invention.

1 is a left side view showing a motorcycle corresponding to an embodiment of the present invention.

2 is a developed cross-sectional view showing an engine of a motorcycle.

3 is an exploded sectional view showing yet another region of the engine.

4 is a left side view showing the right crankcase half of the engine.

Fig. 5 is a right side view showing the left crankcase half body of the engine.

FIG. 6 is an enlarged view showing the main part of FIG. 5.

FIG. 7 is a cross-sectional view taken along the line A-A of FIG. 6.

8 is a cross-sectional view taken along the line BB of FIG. 6, in which FIG. 8 (a) shows a state in which a reed valve is attached to the right side, and FIG. 8 (b) shows a state in which the reed valve is attached incorrectly. .

FIG. 9 is a view seen from the direction shown by arrow A of FIG. 5.

FIG. 10 is a cross-sectional view taken along line A-A of FIG. 9.

11 shows a cylinder of the engine seen on a cylinder.

12 shows the cylinder head of the engine as seen from the cylinder axis.

FIG. 13 is a cross-sectional view taken along line A-A of FIG. 12.

1 ...... Motorcycle (Saddle Seated Vehicle)

21 ..... Crankcase

21a .... Left case half (one segment)

21b .... Right Case Half Body

21c .... Right Case Cover (Crankcase Cover)

31 ..... Crankshaft

32 ..... cylinder

33 ..... Cylinder Head

33b .... Left wall (side wall)

35 ..... Connecting rod

36a .... Left Crank Bearing (Single Crank Bearing)

36b .... right crank bearing (other crank bearing, generator side crank bearing)

37 ..... Generator

42a .... Lubricant supply passage in the left bearing (first oil passage)

42b .... Lubricant supply passage in the right bearing (second oil passage)

44 ..... Oil passage on the generator side (3rd oil passage)

46 ..... generator lubricant supply passage

48 ..... Connecting rod lubricant supply passage

52 ..... Camshaft

54 ..... Cam Chain

68 ..... oil filter

72 ..... oil spill passage (first oil passage)

74 ..... Cooling water passage (water jacket)

75 ..... Communication Home

76 ..... Main oil gallery (second oil passage)

78 ..... no seal

85 ..... Chain (oil pump drive chain)

114 .... Bolt insertion hole

117 .... longitudinal oil passage in the head (oil passage in the head)

118 .... Sloping oil passage in the head (oil passage in the head)

120 .... Camshaft Lubricant Supply Aisle

E ...... engine

B1 ..... Split face

Claims (6)

As the oil passage structure of the engine E in which the crankcase 21 supporting the crankshaft 31 is divided in the crank axial direction, First and second oil passages 72 and 76 extending substantially parallel to the crankshaft 31 across the dividing surface B1 of the crankcase 21, A communication groove 75 connecting the oil passages and formed in the divided surface B1 of the at least one divided body 21a of the crankcase 21; And An endless sealing member which integrally surrounds the oil passage and the outer circumference of the communication groove 75 and each half is provided in the oil passage and the communication groove 75 facing each other on the divided surface B1. Oil passageway structure with (78). The method according to claim 1, A cartridge type oil filter 68 is attached to the crankcase 21 side; The first oil passage 72 communicates with an oil outlet 68d of the oil filter 68; The second oil passage (76) communicates with the crank bearings (36a, 36b) of the crankcase (21). The method according to claim 1 or 2, A cylinder 32 protruding from the crankcase 21; A cylinder head 33 attached to an end of the cylinder 32; A crankcase cover 21c covering one side of the crankcase 21; And a generator 37 disposed inside the crankcase 21. A camshaft lubricating oil supply passage 120 for supplying engine oil to the outer circumference of the camshaft 52 from one crank bearing 36a through the cylinder 32 and the cylinder head 33; A connecting rod lubricating oil supply passage 48 for supplying engine oil to the outer circumference of the connecting rod 35 from the other crank bearing 36b through the crankshaft 31; A generator lubricating oil supply passage 46 for supplying engine oil to the generator 37 through a crankcase cover 21c; And And further comprising a main oil gallery 76 extending on the outside of each crank bearing 36a, 36b in the axial direction of the crankshaft 31, The main oil gallery 76 includes a first oil passage 42a communicating with the camshaft lubricant supply passage 120, a second oil passage 42b communicating with the connecting rod lubricant supply passage 48, and An oil passage structure branching to a third oil passage (44) in communication with said generator lubricating oil supply passage (46). The method according to claim 3, The cylinder (32) is provided with a stud bolt inserting hole (114) for fastening the cylinder (32) and the cylinder head (33) to the crankcase (21); The camshaft lubricant supply passage (120) communicates with the cylinder head (33) from a crank bearing on the opposite side of the cam chain (54) through the bolt insertion hole (114); Engine oil is supplied around the camshaft 52 via in-head oil passages 117, 118 provided in the side wall 33b opposite the cam chain 54 at the cylinder head 33, Oil passage structure. The method according to claim 3, The oil passageway structure in communication with an upstream side of the main oil gallery (76) is disposed proximate to a water jacket (74). The method according to claim 4, The cam chain (54) and the oil pump drive chain (85) are provided between the generator (37) side crank bearing (36b) and the generator (37).

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