JP5480665B2 - Shaft assembly structure - Google Patents

Description

  The present invention relates to an assembly structure of a drive shaft and a driven shaft of an internal combustion engine.

  Conventionally, in an internal combustion engine shaft assembly structure, an auxiliary machine such as an oil pump is provided in a case cover, and a drive shaft that is a crankshaft and a driven shaft that drives the oil pump and the like are arranged on the same axis. Patent Document 1 discloses a structure in which a drive shaft and a driven shaft are assembled by spline fitting (see Japanese Patent No. 2777695).

Japanese Patent No. 2777695

  In such an assembly structure of the drive shaft and the driven shaft, since the driven shaft for driving the oil pump is assembled by spline fitting at one end of the drive shaft, the engine is further increased by the length of the driven shaft. The width of the engine has become wider and the engine has become larger. In addition, an oil pump is attached to the case cover in advance, and then the boss with spline teeth formed on the driven shaft end is formed on the spline shaft formed on the drive shaft end while the case cover is engaged with the crankcase. Since the work must be done so that it can be fitted, the spline shaft of the drive shaft and the boss of the driven shaft can be fitted while visually confirming the positional relationship between the drive shaft and the driven shaft from the narrow space between the crankcase and the case cover. Therefore, it is difficult to assemble the drive shaft and the driven shaft.

The present invention solves the above-mentioned problem, and the invention according to claim 1 is a drive shaft, a case that supports the drive shaft, a cover that covers an axially outer side of the drive shaft of the case, An auxiliary machine provided on the cover, a driven shaft that is supported by the cover in parallel with the drive shaft and drives the auxiliary machine, a drive gear that is supported by the drive shaft, and an axial direction or a radial direction of the driven shaft And a convex portion that protrudes to the cover, is temporarily supported by the case when the cover is assembled, is meshed with the drive gear, and is rotatably supported by the driven shaft so as to overlap the driven shaft in the axial direction. A concave portion that is recessed in the driven shaft direction so that the convex portion can be accommodated, and is provided continuously with the concave portion so as to be inclined with respect to the axial direction of the driven shaft so as to fit the convex portion into the concave portion. a driven gear guide surface for guiding the formed And it is characterized in that there was example.

According to a second aspect of the present invention, in the first aspect of the present invention, the convex portion is a cylindrical pin member that is provided on the driven shaft and protrudes in the radial direction, and the guide surface is in the driven shaft direction. The concave portion is formed on both sides of the guide surface. The tapered surface is tapered in the circumferential direction .

According to a third aspect of the present invention, in the first aspect of the present invention, the convex portion is a male dowel provided integrally with the driven shaft and protruding in the axial direction of the driven shaft, and the concave portion is the male male shaft. A female dowel that is recessed in the axial direction so as to accommodate a dowel, wherein the guide surface is a tapered surface that is formed in the female dowel and is inclined in a circumferential direction .

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the driven gear is formed with a boss portion that protrudes in the axial direction of the driven shaft on the case side, and the rotating shaft. A hole through which the driven shaft passes is provided at the center, and a boss portion of the driven gear is fitted into the case, and a boss that supports the driven gear is formed, and the driven gear is engaged with the drive gear. In the state, the outer periphery of the boss portion of the driven gear is temporarily supported by the boss of the case .

The invention according to claim 5 is the crankcase according to claim 4 , wherein the drive shaft is a crankshaft, the driven shaft is located below the drive shaft, and the case supports the crankshaft. The boss of the case is formed to protrude in the axial direction of the crankshaft from a vertical wall that supports the crankshaft .

The invention according to claim 6 is the invention according to claim 5 , wherein the driven shaft and the driven gear are connected by fitting a spline formed on an outer periphery of the driven shaft and an inner periphery of the boss portion of the driven gear. It is characterized by that.

The invention according to claim 7 is a drive shaft, a case for supporting the drive shaft, a cover for covering the outer side of the drive shaft in the axial direction, an auxiliary device provided on the cover, and in parallel with the drive shaft. A driven shaft supported by the cover and driving the accessory, a drive gear supported by the drive shaft, and meshed with the drive gear, and supported by the driven shaft so as to be integrally rotatable when the cover is assembled. A driven gear, a case-side shaft end of the driven shaft, a convex portion formed to protrude from the driven gear in the axial direction of the driven shaft, and formed on the case side so as to accommodate the convex portion. A recess that is recessed in the axial direction of the driven shaft, and a guide that is provided continuously to the recess in the case and that is inclined with respect to the axial direction of the driven shaft so as to fit the convex portion into the recess. It is characterized by having a surface .

The invention according to claim 8 is the invention according to claim 7 , wherein the convex portion is an extended portion in which a shaft end of the driven shaft is extended, and the concave portion is a driven shaft support hole formed in the case. The guide surface is formed in a fan shape and is a tapered surface that is inclined with respect to the axial direction of the driven shaft toward the driven shaft support hole .

The invention according to claim 9 is the invention according to any one of claims 1 to 8 , wherein the case is a crankcase, the drive shaft is a crankshaft, and the auxiliary machine is an oil pump. And an oil filter is provided in the cover .

According to the first aspect of the present invention, since the drive shaft and the driven shaft for driving the auxiliary machine are arranged in parallel, the width of the case and the cover in the direction of the drive shaft is reduced, and the size reduction is possible. Further, when the cover is assembled to the case, the axial convex portion of the driven shaft supported by the cover is guided through a guide surface provided on the case side, and provided on the case side continuously with the guide surface. Since it is fitted in the formed recess, the assembly work of the driven gear and the driven shaft is facilitated. Further, since the convex portion in the axial direction of the driven shaft supported by the cover is guided through the guide surface provided in the driven gear and is fitted into the concave portion provided in the driven gear, the set of the driven gear and the driven shaft. Attaching work becomes easy.

According to the second aspect of the present invention, when the cylindrical pin member of the driven shaft and the recessed portion of the driven gear are fitted, the cylindrical pin member is pointed in the driven direction provided in the driven gear and is circumferential. While sliding along the guide surface inclined in the direction, it is guided to the concave portions formed on both sides of the guide surface, and the driven shaft rotates in the direction in which the convex portions are fitted into the concave portions. As a result, the assembly work becomes easier. Further, since the driven gear is meshed with the drive gear in advance and temporarily supported by the case, the operation of meshing the drive gear and the driven gear with each other when the cover is attached to the case becomes easy.

According to the third aspect of the present invention, since the driven shaft and the driven gear are connected by the male dowel of the driven shaft and the female dowel provided on the driven gear, the strength of the connecting portion can be increased. In addition, since the female dowel has a tapered surface that is inclined in the circumferential direction, when the driven shaft is moved closer to the driven gear, the male dowel fits the female dowel by the tapered surface. Since the driven shaft is guided and the driven shaft rotates in the direction in which the male dowel and the female dowel are fitted, the resistance during guiding is reduced and the assembling work is facilitated. Furthermore, since the driven gear is meshed with the drive gear in advance and temporarily supported by the case, the operation of meshing the drive gear and the driven gear when the cover is attached to the case becomes easy.

According to the fourth aspect of the present invention, the driven gear is engaged with the drive gear while the boss provided on the driven gear is temporarily supported on the case, and then the driven gear is assembled. The assembling work can be performed in a separate process, and the assembling work of the auxiliary machine can be facilitated. Further, by making the boss provided on the driven gear longer in the driven shaft direction, it is possible to prevent the driven gear from collapsing during temporary support of the case of the driven gear and to improve the temporary support.

According to the invention of claim 5 , the crankcase is reinforced by the boss provided on the crankcase side.

According to the sixth aspect of the present invention, the spline is formed on the outer periphery of the driven shaft and the inner periphery of the boss portion of the driven gear, and the driven shaft and the driven gear are connected by fitting the spline. It is possible to easily increase the engagement timing of the driven gear.

According to the seventh aspect of the present invention, the convex portion in the axial direction of the driven shaft supported by the cover is guided to the concave portion provided adjacent to the guide surface by the guide surface, and the convex portion and the concave portion are fitted. As a result, the assembly work of the driven shaft becomes easy.

According to the eighth aspect of the present invention, when the cover is assembled to the case, the fan is provided in the case when the cover is slid to the case side in the driven shaft direction after being engaged with the drive gear while rotating the driven gear. Since the driven shaft incorporated in the cover by the die taper surface is guided to the driven shaft support hole, the assembly of the auxiliary machine and the cover is improved.

According to the ninth aspect of the present invention, since the oil pump and the oil filter are provided on the cover, the oil passage can be formed in a concentrated manner on the cover, the oil passage processing becomes easy, and the oil passage can be shortened. Is possible.

1 is a right side view showing an embodiment of a motorcycle 1 equipped with an internal combustion engine to which a shaft assembly structure of the present invention is applied. 1 is a longitudinal sectional view illustrating a part of an internal combustion engine to which the present invention is applied. It is the outer side figure which illustrated the driven gear of Example 1 (right side view in FIG. 2). It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is the figure which showed the assembly | attachment work state of Example 1. FIG. It is the figure which showed the assembly | attachment work state of Example 1. FIG. It is the longitudinal cross-sectional view which illustrated a part of internal combustion engine to which the assembly structure of Example 2 is applied. These are the inner side figures (left side figure in FIG. 10) which showed the connection member of Example 2. FIG. These are the outer side figures (right side figure in FIG. 10) which illustrated the driven gear of Example 2. FIG. FIG. 13 is an enlarged sectional view taken along line XIII-XIII in FIG. 12. These are the longitudinal cross-sectional views which showed some internal combustion engines with which the assembly | attachment structure of Example 3 is applied. These are figures which showed the XV-XV cross section of FIG. These are the longitudinal cross-sectional views which showed some internal combustion engines to which the assembly | attachment structure of Example 4 is applied. These are the longitudinal cross-sectional views which showed some internal combustion engines with which the assembly structure used as a reference is applied.

  Hereinafter, modes for carrying out the present invention will be described.

  Referring to FIG. 1, in a motorcycle 1 equipped with an internal combustion engine to which the shaft assembly structure of the present invention is applied, a down frame 3 extends rearward and downward from the front end of the main frame 2. An underframe 4 extends from the lower end. The rear end of the under frame 4 is connected to the end of the center frame 5 extending downward from the center of the main frame 2 and the end of the rear frame 6 extending from the rear of the main frame by a bracket 7. Yes. A fuel tank 8 is mounted on the front of the main frame 2 and a seat 9 is provided behind the fuel tank 8.

  A front fork 11 is supported to be steerable via a head tube 10 disposed at the front end of the main frame 2, and a front wheel 12 is rotatably supported at the lower end of the front fork 11. A handle 13 is provided above the front fork 11. A front end of a rear fork 14 is pivotally supported on the bracket 7 by a shaft 15, and the rear fork 14 extends rearward and a rear wheel 16 is rotatably supported at the rear end. A rear cushion unit 17 is interposed between the rear portion of the main frame 2 and the rear portion of the rear fork 14.

  In the space surrounded by the main frame 2, the down frame 3 and the center frame 5, the internal combustion engine 20 faces the front and rear edges (vehicle center plane) passing through the center of the vehicle so that the internal combustion engine 20 faces the cylinder axis upward and the crank axis. It is mounted in the vehicle width direction.

  The internal combustion engine 20 is a single-cylinder four-cycle internal combustion engine, in which a cylinder block 21, a cylinder head 22, and a head cover 23 are stacked on a left and right crankcase 42 and are fastened together with bolts. A cylinder 24 is fitted inside the cylinder block 21, a piston (not shown) is slidably fitted in the cylinder 24, and the crankshaft 41 and the piston are connected via a connecting rod 25.

  A shaft assembly structure 40 according to an embodiment of the present invention will be described below with reference to FIGS.

  Referring to FIG. 2, the shaft assembly structure 40 includes a crankshaft 41 that is a drive shaft, a crankcase 42 that supports the crankshaft 41 that is a drive shaft, and a case that covers the outer side of the crankcase 42 in the crankshaft direction. A cover 44, an oil pump 60 provided in the case cover 44, an oil pump shaft 65 that is supported by the case cover 44 in parallel with the crankshaft 41 and that is a driven shaft that drives the oil pump 60 that is a kind of auxiliary machine, A drive gear 48 supported by the crankshaft 41, a driven gear 50 supported by the oil pump shaft 65 so as to be integrally rotatable and driving the oil pump shaft 65, and a mechanism provided on the oil pump shaft 65 and projecting in the radial direction of the shaft A convex portion 49 that is a joint portion, a concave portion 53 that is provided in the driven gear 50 and that is recessed in the axial direction, and a guide surface 54 that guides the convex portion 49 so as to fit into the concave portion 53 are provided.

  In the crankcase 42, a left crankcase 42L and a right crankcase 42R are integrally fastened by bolts with a cylinder axis line interposed therebetween. A left case cover 44L is detachably attached to the left side of the left crankcase 42L, and a right case cover 44R is detachably attached to the right side of the right crankcase 42R. The crankshaft 41 is rotatably supported by a pair of metal bearings 26 provided in the left and right crankcases 42L and 42R.

  A generator 31 is directly connected to the left side of the crankshaft 41, a drive gear 48 is integrally fitted to the right side via a key 27, and a nut 29 is connected to the right side of the drive gear 48 via a washer 28. The right end portion of the crankshaft 41 is rotatably supported by a boss 45 of the right case cover 44R.

  An oil pump 60 composed of an outer rotor 61 and an inner rotor 62 is disposed below the right end portion of the crankshaft 41. An oil pump shaft 65 that rotationally drives the oil pump 60 has an inner end portion 65a (the left end portion in FIG. 2). Part) is formed in a tapered shape, is arranged in a direction parallel to the crankshaft 41, and is driven by the crankshaft 41 via the drive gear 48 and the driven gear 50.

  A boss 46 that pivotally supports the oil pump shaft end and an oil pump fitting portion 47 for fitting the oil pump 50 are formed on the inner side of the right case cover 44R. The outer rotor 61 is fitted to the outer rotor 61, and the inner rotor 62 is assembled to the outer rotor 61.

  A groove 63 is provided on the end surface of the inner rotor 62 on the right crankcase side, and a pin 66 that is fitted closer to the outside of the oil pump shaft 65 is fitted into the groove 63. Further, the inner rotor 62 is formed with a central shaft hole 64 centered on the rotation shaft, and the oil pump shaft 65 is inserted therein.

  An oil pump shaft 65 fitted with a pin 66 is inserted into a central shaft hole 64 provided in the inner rotor 62, and the pin 66 is fitted into the groove 63. After the inner end portion 65a of the oil pump shaft 65 is inserted into the hole 68 provided in the oil pump support member 67, the oil pump support member 67 and the right case cover 44R are joined together by the bolt 35, thereby the case cover 44R. The oil pump 60 and the oil pump shaft 65 are rotatably assembled to the oil pump shaft 65. The oil pump shaft 65 is rotatably supported by the boss 46 of the right case cover 44R and the hole 68 of the oil pump support member 67, and further the oil pump shaft. Power is transmitted between the 65 and the inner rotor 62 via the pin 66.

  On the inner side of the oil pump shaft 65, a convex portion 49 that is an engaging portion protruding in the radial direction of the oil pump shaft 65 is provided. The convex portion 49 is composed of both end portions of a pin 69 fitted so as to be perpendicular to the axial direction of the oil pump shaft 65.

  Further, the right crankcase 42R is provided with a boss 43 that is parallel to the axial direction of the crankshaft 41 and that has an extension line of the axial center line of the oil pump shaft 65 as a central axis. It is loosely fitted so that it can rotate.

  An oil pan 70 is formed by the left and right crankcases 42R and 42L below the crankcase, and an oil strainer 71 is sandwiched between the right crankcase 42R and the right case cover 44R at the upper right of the oil pan 70, and above the oil strainer 71. Further, an oil passage 72 is formed by the right crankcase 42R and the right case cover 44R, and oil is sucked into the suction port 50a of the oil pump 50 through the oil passage 73 formed in the right case cover 44R. ing. Further, the oil pump discharge port 50b communicates with an oil passage (not shown) so that the oil discharged by the oil pump 50 is pumped to each part of the internal combustion engine.

  3 to 6, the driven gear 50 is a gear that meshes with the drive gear 48, and a hole 51 that penetrates the oil pump shaft 65 is provided at the center of the driven gear 50. A boss 52 that is loosely fitted to the boss 43 provided in the right crankcase 44R is provided on the inner end face (left end face in FIG. 2). On the outer end surface of the driven gear 50 (the right end surface in FIG. 2), a plurality of grooves 53 radially extending from the center of the driven gear 50 and having recesses 53 that are recessed in the axial direction are equiangularly spaced in the circumferential direction. Between each of the recesses 53, a guide portion 54 is provided between the recesses 53. The guide portions 54 look like a sector when viewed from the outer side of the driven gear 50 (right side view in FIG. 2). A guide surface 55 that is inclined in the circumferential direction from the ridge line along the center line is formed.

  When the right case cover 44R of the internal combustion engine 20 is assembled to the right crankcase 42R, the boss 52 of the driven gear 50 is first engaged with the driven gear 50 as shown in FIGS. Is loosely fitted to the boss 43 of the right crankcase 42R. Thereafter, when the right case cover 44R is brought closer to a predetermined position from the right side to the right crankcase 42R, the oil pump 60 and the oil pump shaft 65 are integrally attached to the right case cover 44R by the bolt 35 by the oil pump support member 67. Since they are coupled, the pin 69 fitted to the oil pump shaft 65 contacts one of the guide surfaces 55 provided on the guide portion 54 of the driven gear 50, and the convex portions 49 that are both ends of the pin 69. Is guided while sliding along the inclination of the guide surface 55 and fits into any of the recesses 53 formed on both sides of the guide surface 55. 2 and 7, the oil pump shaft 65 and the driven gear 50 are connected via the pin 69 so that the driving force of the driven gear 50 is transmitted to the oil pump shaft 65. .

  Since the present embodiment is configured as described above, the crankshaft 41 that is the drive shaft and the oil pump shaft 65 that is the driven shaft are arranged in parallel to narrow the width of the internal combustion engine 20 in the crankshaft direction. Therefore, the internal combustion engine 20 can be made compact.

  When the right case cover 44R is assembled to the right crankcase 42R, the driven gear 50 is meshed with the drive gear 48 in advance, and the boss 43 provided on the right crankcase 42R is loosely fitted to the boss 52 of the driven gear 50. Since the driven gear 50 is temporarily supported by the crankcase 42R, it is not necessary to assemble the driven gear 50 to the drive gear 48 from the narrow gap between the right crankcase 42R and the right case cover 44R, and the drive gear 48 and the driven gear 50 The work of meshing with each other becomes easy.

  Further, when the right case cover 44R is moved closer to the right crankcase 42R in an attempt to assemble the right case cover 44R to the right crankcase 42R, the oil pump shaft pivotally supported by the right case cover 44R and the oil pump support member 67. The pin 69 fitted in 65 is brought into contact with the guide surface 55 of one of the guide portions 54 of the driven gear 50 that is previously meshed with the drive gear and temporarily supported by the boss of the right crankcase 42R. The oil pump shaft 65 rotates in the direction in which the pin 69 fits into the recess 53 while being guided by the recess 53 formed on both sides of the guide surface while sliding along the oil guide 55. The resistance when the gear 50 is assembled is reduced, and the assembling work is facilitated.

  When the right case cover 44R is assembled to the right crankcase 42R, the driven gear 50 is previously meshed with the drive gear 48 and temporarily supported by the crankcase 42R, and the inner end portion 65a of the oil pump shaft 65 is The pin 69, which is formed in a tapered shape and is fitted on the oil pump shaft 65, is guided by the guide surface of the guide portion 55 of the driven gear 60 and guided to the recess 53, so that the right crankcase 42R and the right Even when viewed from a narrow gap between the case covers 44R, the oil pump shaft 65 can be easily inserted into the central shaft hole 64 provided in the driven gear 50, and the pin 69 is fitted into the recess 53 of the driven gear 50. And the workability of the assembly work is improved.

  The shaft assembly structure 80 of the second embodiment shown in FIGS. 10 to 13 will be described below.

  The shaft assembly structure 80 of the second embodiment is engaged with the driven gear 90 and the driven gear 90 in place of the driven gear 50 of the shaft assembly structure 40 of the first embodiment, and can rotate integrally with the oil pump shaft 65. And a connecting member 81 supported by the head.

  As shown in FIG. 11, the connecting member 81 is provided with a hole 87 through which the oil pump shaft 65 penetrates at the center thereof, and is disposed outside the driven gear 90 (right side in FIG. 10). A male dowel 82, which is a convex portion protruding in the axial direction of the oil pump shaft 65, which is a driven shaft, is provided on the inner end surface (the left end surface in FIG. 10) of the connecting member 81, and an oil end is provided on the outer end surface. A groove portion 88 is provided in which a pin 69 fitted to the pump shaft 65 is fitted. The male dowel 82 includes a top surface 83, a bottom surface 84, a power transmission surface 85, and a tapered surface 86. Each surface is radially divided with respect to the rotation axis of the oil pump shaft 65, and the top surface 83 is driven. One end portion 83a of the top surface 83 divided into the gear 90 side is connected to the bottom surface 84 through a power transmission surface 85 formed perpendicular to the top surface 83. The other end 83 b of the surface 83 is connected to the bottom surface 84 via the tapered surface 86.

  Further, as shown in FIG. 12, the driven gear 90 is provided with a hole 97 through which the oil pump shaft 65 passes in the center, and a boss 91 similar to that of the first embodiment is formed on the inner end face. However, a female dowel 92 that is a recess for accommodating the male dowel 82 is provided on the outer end face thereof. The female dowel 92 includes a bottom surface 93, a top surface 94, a power transmission surface 95, and a guide surface so as to contact the top surface 83, the bottom surface 84, the power transmission surface 85, and the tapered surface 86 formed on the male dowel 82. A tapered surface 96 is formed. The tapered surface 96 is connected to the bottom surface 93 by being inclined in the circumferential direction from a top surface 94 protruding toward the connecting member in the driven shaft direction.

  Further, as shown in FIG. 13, the power transmission surface 95 of the female dowel 92 of the driven gear 90 is provided continuously to the end portion 94a on the rotational direction side of the driven gear 90 among the end portions of the top surface 94. When the driven gear 90 is rotationally driven by the drive gear 48, rotational power is transmitted from the power transmission surface 95 of the driven gear 90 to the power transmission surface 85 of the connecting member 81.

  When assembling the shaft assembly structure 80, first, the boss 91 of the driven gear 90 is fitted to the boss 43 of the right crankcase 42R, and the driven gear 90 is temporarily supported by the right crankcase 42R. Thereafter, the oil pump shaft 66 pivotally supported by the right case cover 44R is fitted into the hole 87 of the connecting member 81, and the pin 66 fitted to the oil pump shaft 65 is fitted into the groove portion 88 of the connecting member 81. Further, the right case cover 44R in which the oil pump 60, the oil pump shaft 65, and the connecting member 81 are integrally assembled is brought close to the right crankcase 42R, and the oil pump shaft 66 is inserted into the hole 97 of the driven gear 90. Meanwhile, the female dowel 92 of the driven gear 90 and the female dowel 82 of the connecting member 81 are engaged.

  Since the shaft assembly structure 80 of the second embodiment is configured as described above, when the right case cover 44R is brought closer to the right crankcase 42R, it is integrally connected to the oil pump shaft 65 by the pin 69. The top surface 83 of the male dowel 82 of the connecting member 81 is guided by the tapered surface 96 of the female dowel 92 of the driven gear 90 so that the male dowel 82 and the female dowel 92 are fitted, and the male dowel 82 and the female dowel 92 are fitted. Since the oil pump shaft 65 rotates in the mating direction, the resistance is reduced when guiding and the assembling work is facilitated.

  A shaft assembly structure 100 according to the third embodiment illustrated in FIGS. 14 to 15 will be described.

  The shaft assembly structure 100 according to the third embodiment has a driven gear 101, an oil pump shaft 103, instead of the driven gear 50, the oil pump shaft 60, and the oil pump support member 65 of the shaft assembly structure 40 according to the first embodiment. , An oil pump support member 104, a shaft extension 103a which is a convex portion extending the oil pump shaft 103 in the axial direction, a boss 106 provided in the right crankcase 42R, and the boss 106 An oil pump shaft support hole 107 that is a recess provided, a guide surface 108 that is provided on the inner surface of the boss 106 and guides the shaft extension 103a of the oil pump shaft 103, and a tapered surface that is a part of the guide surface 108 109.

  The driven gear 101 is provided with a groove 102 on an inner end surface 101a (left end surface in FIG. 14), and a pin 49 fitted to the oil pump shaft 103 is fitted into the groove 102. The tip of the shaft extension 103a of the oil pump shaft 103 is formed on a surface orthogonal to the axial direction. The oil pump support member 104 is formed with a cylindrical portion 105 that extends until it contacts the outer end surface 101b of the driven gear on the driven gear side.

  The boss 106 is provided on the right crankcase 42R, and is formed in a fan shape as seen from the oil pump shaft direction as shown in FIG. 15. The boss 106 is parallel to the axial direction of the crankshaft 41 and A driven shaft support hole 107 having an extension line of the shaft center line of the oil pump shaft 103 as a central axis is provided, and a guide having a tapered surface 109 inclined from the boss 106 toward the driven shaft support hole 107 with respect to the oil pump axis line. A surface 108 is formed.

  The shaft assembly structure 101 is assembled as follows. First, the pin 69 is fitted to the oil pump shaft 103, the driven gear 101 is fitted to the oil pump shaft 103 from the oil pump side, and the oil pump support member 104 is connected to the inner end portion 105a of the tubular portion 105 by the driven gear. It fits until it contacts the outer end face 101b of 101. Further, the pin 66 is inserted into the oil pump shaft 103, and the outer end portion 103b of the oil pump shaft 103 is inserted into the central shaft hole 64 of the inner rotor 62 and the boss of the right case cover 44R while the pin 66 is fitted into the groove 63 of the inner rotor 62. The oil pump shaft support member 104 and the right case cover 44R are integrally fastened with bolts (not shown).

  Thereafter, when the right case cover 44R is moved closer to the right crankcase cover 42R, the shaft extension 103a of the oil pump shaft 103 comes into contact with the guide surface 108 of the boss 106 and is temporarily supported. When rotating and meshing with the drive gear 48 and then sliding the right case cover 44R in the oil pump axial direction, the shaft extension 103a is guided by the tapered surface 109 provided on the guide surface 108, and the driven shaft support hole 107 is guided. Inserted.

  Since the shaft assembly structure 100 is configured as described above, the oil pump shaft 103 is temporarily supported by the guide surface 108 of the boss 106 during assembly, and the driven gear 101 supported by the oil pump shaft 103 is provided. It becomes easy to mesh with the drive gear 48 while rotating, and after the meshing, it is slid in the oil pump axial direction, and the shaft extension portion 103a of the oil pump shaft 103 is a tapered surface of the guide surface 107 provided on the boss 106 108 is guided to the driven shaft support hole 107, so that the oil pump 60 and the case cover 44, which are auxiliary machines, can be easily assembled even when the right crankcase 42R and the right case cover 44R are viewed from a narrow space. Can be done.

  Furthermore, the fourth embodiment illustrated in FIG. 16 will be described.

  The shaft assembly structure 110 according to the fourth embodiment includes a driven gear 111, an oil pump shaft 114, and an oil pump support member 104 in place of the driven gear 50 and the oil pump shaft 65 of the shaft assembly structure 40 according to the first embodiment. I have.

  In the driven gear 111, bosses 112 and 113 extending in the axial direction of the oil pump shaft are formed on the oil pump side and the crankcase side, respectively, and a spline is formed on the inner peripheral surface 113a of the boss 113. Yes. The oil pump shaft 114 has a tapered inner end 114a, and a spline is formed on the outer peripheral surface 114b adjacent to the inner end 114a and in contact with the inner peripheral surface 113a of the boss 113. The boss 113 is fitted to the inner peripheral surface 113a. Further, the oil pump support member 104 is formed with a cylindrical portion 105 that is extended until it contacts the outer end surface of the driven gear on the driven gear side.

  Since the shaft assembly structure 110 is configured as described above, after the driven gear 111 is temporarily supported by the boss 43 of the right crankcase 42R, the oil pump shaft 114 assembled to the right case cover 44R is installed. When inserted into the bosses 112 and 113 of the driven gear 111, the outer peripheral surface 114b of the oil pump shaft 114 and the inner peripheral surface 113a of the boss 113 of the driven gear 111 are connected by spline fitting. Since the oil pump shaft 113 and the driven gear 112 are connected by spline fitting, the engagement timing can be easily increased, and the assembling property is improved.

Reference example

  Further, the reference example illustrated in FIG. 17 will be described.

  In the shaft assembly structure 115 of the reference example, instead of the driven gear 50, the oil pump shaft 65, and the oil pump support member 67 of the shaft assembly structure 40 of the first embodiment, a driven gear 116, an oil pump shaft 118, An oil pump support member 104 and a circlip 120 are provided, and the right crankcase 44R has no boss 43 formed thereon.

  The driven gear 116 is provided with a groove 117 on the outer end surface thereof, into which a pin 69 fitted to the oil pump shaft 118 is fitted. The oil pump shaft 118 has an inner end surface 118a formed in a plane substantially perpendicular to the axis, and a groove 119 for engaging the circlip 120 on the shaft outer peripheral surface of the inner end portion.

  Since the shaft assembly structure 115 is configured as described above, it is assembled as follows. First, the oil pump 60 and the oil pump support member 104 are assembled to the right case cover 44R, the pin 49 is fitted to the oil pump shaft 118, and the driven gear 116 is fitted so that the groove 117 portion of the driven gear 116 is fitted to the pin 69. Is fitted to the oil pump shaft 118, and the circlip 120 is engaged with the groove 119 of the oil pump shaft 118. Thereafter, the driven gear 116 is engaged with the drive gear 48 and assembled while the right case cover 44R is brought close to the right crankcase 42R.

  In this reference example, since the oil pump shaft 118 is supported in a cantilever manner on the right case cover 44R, the driven gear 116 can be easily meshed with each other, and the assemblability is improved.

  In the first to fourth embodiments, the auxiliary machine driven by the driven shaft is an oil pump. However, other auxiliary machines such as a water pump and a balancer may be used.

  Further, an oil filter 121 may be provided in the right case cover 44R. When the oil filter 121 is provided in the right case cover 44R, since the oil pump 60 is provided in the same right case cover 44R, it is possible to concentrate the oil passage on the cover, and the oil passage processing is easy. In addition, the oil passage can be shortened.

  DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Main frame, 3 ... Down frame, 4 ... Under frame, 5 ... Center frame, 6 ... Rear frame, 7 ... Bracket, 8 ... Fuel tank, 9 ... Seat, 10 ... Head tube, 11 ... Front fork, 12 ... Front wheel, 13 ... Handle, 14 ... Rear fork, 15 ... Shaft, 16 ... Rear wheel, 17 ... Rear cushion unit, 20 ... Internal combustion engine, 21 ... Cylinder block, 22 ... Cylinder head, 23 ... Head cover, 24 ... Cylinder, 25 ... Connecting rod, 26 ... Metal bearing, 27 ... Key, 28 ... Washer, 29 ... Nut, 31 ... Generator, 33 ... Boss, 35 ... Bolt, 40 ... Shaft assembly structure, 41 ... Crankshaft 42 ... Crank case, 43 ... Boss, 44 ... Case cover, 45 ... Boss, 46 ... Boss, 47 ... Oil pump fitting part, 48 ... Driving gear, 49 ... Convex part, 50 ... Driving gear, 51 ... Hole, 52 ... Boss, 53 ... Recess, 54 ... Guide part, 5 5 ... guide surface, 60 ... oil pump, 61 ... outer rotor, 62 ... inner rotor, 63 ... groove, 64 ... center shaft hole, 65 ... oil pump shaft, 66 ... pin, 67 ... oil pump support member, 68 ... hole, 69 ... Pin, 70 ... Oil pan, 71 ... Strainer, 72 ... Oil passage, 73 ... Oil passage, 80 ... Shaft assembly structure, 81 ... Connecting member, 82 ... Male dowel, 83 ... Top face, 84 ... Bottom face, 85 ... power transmission surface, 86 ... tapered surface, 87 ... hole, 88 ... groove, 90 ... driven gear, 91 ... boss, 92 ... female dowel, 93 ... bottom surface, 94 ... top surface, 95 ... power transmission surface, 96 ... taper Surface, 97 ... hole, 100 ... shaft assembly structure, 101 ... driven gear, 102 ... groove, 103 ... oil pump shaft, 104 ... oil pump support member, 105 ... cylindrical portion, 106 ... boss, 107 ... driven shaft Support hole, 108 ... guide surface, 109 ... tapered surface, 110 ... shaft assembly structure, 111 ... driven gear, 112 ... boss, 113 ... boss, 114 ... oil pump shaft, 115 ... shaft assembly groove, 116 ... Obedience Gear, 117 ... groove portion, 118 ... oil pump shaft, 119 ... groove, 120 ... circlip, 121 ... oil filter.

Claims (9)

Drive shaft (41),
A case (42) for supporting the drive shaft (41);
A cover (44) covering the axially outer side of the drive shaft (41) of the case (42);
An auxiliary machine (60) provided in the cover (44);
A driven shaft (65) that is supported by the cover (44) in parallel with the drive shaft (41) and drives the auxiliary machine (60),
A drive gear (48) supported by the drive shaft (41);
Convex portions (49, 82) protruding in the axial direction or radial direction of the driven shaft (65);
When the cover (44) is assembled, it is temporarily supported by the case (42), meshed with the drive gear (48), and supported by the driven shaft (65) so as to be integrally rotatable. ) And a concave portion (53, 92) that is recessed in the driven axial direction so as to accommodate the convex portion (49, 82), and is provided continuously to the concave portion (53, 92). A driven gear formed with a guide surface (55, 96) that is inclined with respect to the axial direction of the driven shaft and guides the convex portions (49, 82) to fit into the concave portions (53, 92). 50, 90) and an assembly structure of the shaft. The convex portion (49) is a cylindrical pin member (69) provided on the driven shaft (41) and projecting in the radial direction,
The guide surface (55) is composed of a tapered surface (55) that is inclined in the circumferential direction while being sharpened in the driven shaft (65) direction,
The shaft assembling structure according to claim 1, wherein the concave portion (53) is formed on both sides of the guide surface (55) . The convex portion (82) is a male dowel (82) provided integrally with the driven shaft (65) and protruding in the axial direction of the driven shaft (65),
The recess (92) is a female dowel (92) that is recessed in the axial direction so as to accommodate the male dowel (82),
The shaft assembly structure according to claim 1, wherein the guide surface (96) is a tapered surface (96) formed in the female dowel (92) and inclined in a circumferential direction. The driven gear (50, 90) has a boss portion (52, 91) on the case (42) side and protruding in the axial direction of the driven shaft (65), and the driven shaft (65) Is provided with holes (51, 97) through which
In the case, the boss portion (52, 91) of the driven gear is fitted, and a boss (43) for supporting the driven gear (50, 90) is formed.
With the driven gear (50, 90) meshed with the drive gear (48), the outer periphery of the boss portion (52, 91) of the driven gear (50, 90) is connected to the boss of the case (42). The shaft assembly structure according to any one of claims 1 to 3, wherein the shaft assembly structure is temporarily supported by (43) . The drive shaft (41) is a crankshaft (41),
The driven shaft (65) is located below the drive shaft (41),
The case (42) is a crankcase (42) that supports the crankshaft (41),
The shaft according to claim 4 , wherein the boss (43) of the case (42) is formed to project from a vertical wall supporting the crankshaft (41) in an axial direction of the crankshaft (41). Assembly structure. The driven shaft (65) and the driven gear (50, 90) are connected by fitting a spline formed on the outer periphery of the driven shaft (65) and the inner periphery of the boss portion of the driven gear (50, 90). assembling structure of the shaft according to claim 5, characterized in that it is. Drive shaft (41),
A case (42) for supporting the drive shaft (41);
A cover (44) covering the axially outer side of the drive shaft (41) of the case (42);
An auxiliary machine (60) provided in the cover (44);
A driven shaft (65) that is supported by the cover (44) in parallel with the drive shaft (41) and drives the auxiliary machine (60),
A drive gear (48) supported by the drive shaft (41);
A driven gear (50) meshed with the drive gear (48) and supported by the driven shaft (65) so as to be integrally rotatable when the cover (44) is assembled;
A convex portion (103a) formed on the case side shaft end of the driven shaft (65) so as to protrude from the driven gear in the axial direction of the driven shaft;
A concave portion (107) formed on the case side and recessed in the axial direction of the driven shaft (65) so as to accommodate the convex portion (103a);
The case is provided continuously with the concave portion (107), and is inclined with respect to the axial direction of the driven shaft (65) to guide the convex portion (103a) to fit into the concave portion (107). A shaft assembly structure characterized by comprising a guide surface (108). The convex portion (103a) is an extended portion (103a) in which the shaft end of the driven shaft (65) is extended,
The recess (107) is a driven shaft support hole (107) formed in the case (42),
The guide surface (108) is formed in a fan shape, and is a tapered surface (109) inclined with respect to the axial direction of the driven shaft (65) toward the driven shaft support hole (107). The shaft assembly structure according to claim 7 . The case (72) is a crankcase (42),
The drive shaft (41) is a crank shaft (41),
The auxiliary machine (60) is an oil pump (60),
The shaft assembly structure according to any one of claims 1 to 8 , wherein an oil filter (121) is provided in the cover (44) .

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