JP2010223119A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle capable of improving the strength of a swing arm for supporting a rear wheel. <P>SOLUTION: A pair of pivots 34 arranged in the swing arm 32 for supporting the rear wheel 24 are arranged so as to sandwich a crankcase 23 along the width direction of a vehicle body frame 11, and since a pivot shaft 31 is fixed by being inserted into an insertion hole 341 formed at the pivot 34, dislocation in the width direction of the vehicle body frame 11 of the wing arm 32 can be prevented. The pivot shaft 31 is also inserted into a pivot hole 232 of the crankcase 23, and since a bearing member 33 is arranged between an outer peripheral surface of the pivot shaft 31 and an inner peripheral surface of the pivot hole 232, the pivot shaft 31 can smoothly rotate with respect to the crankcase 23, and can prevent dislocation in the axial direction of the pivot shaft 31. Thus, since a bulk is obviated for securing a bearing part composed of an inner race and an outer race, a bearing in the swing arm can be made compact in size. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motorcycle characterized by a swing arm that supports a rear wheel and is provided so as to be swingable with respect to a vehicle body frame.

  Conventionally, as a motorcycle having a swing arm that supports a rear wheel and can swing with respect to a body frame, a motorcycle in which a pivot shaft of a swing arm is supported through a crankcase of an engine is known. (For example, refer to Patent Document 1).

Japanese Patent No. 3773608

  By the way, in the motorcycle described in Patent Document 1, the crankcase is fastened with a fastening member (pivot shaft) to a pair of pivot parts spaced apart in the width direction of the vehicle body via the inner race of the bearing part of the swing arm. A bearing portion is formed between the inner race and the outer race of the swing arm, and the center of the pivot shaft is swung around the axis.

  Therefore, the swing arm is required to have a bulk to secure a bearing portion composed of an inner race and an outer race, and there is a limitation when it is desired to reduce the lateral width.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motorcycle that can make the bearing portion of a swing arm that supports a rear wheel compact.

  In order to achieve the above object, an invention according to claim 1 is directed to an engine mounted on a vehicle body frame, a pivot shaft supported by a crankcase of the engine, and a rear end portion supported by the pivot shaft. In a motorcycle including a swing arm that can swing and a rear wheel that is supported on a rear end portion side of the swing arm, a pair of pivot portions provided on the swing arm can connect the crankcase to the body frame. And the pivot shaft is inserted into the insertion hole of the pivot portion and the pivot hole of the crankcase, and the outer peripheral surface of the pivot shaft and the A bearing member is provided between the inner peripheral surface of the pivot hole.

  In addition to the configuration of the invention described in claim 1, the invention described in claim 2 is configured so that the slit that continues from the outer side of the pivot portion to the inner surface of the insertion hole and the width dimension of the slit are reduced. A fastening member that fastens the pivot portion, and the pivot shaft and the swing arm are integrally fixed by the fastening member.

  Furthermore, in the invention described in claim 3, in addition to the configuration of the invention described in claim 2, the bearing member is a bearing, and is interposed between the crankcase and one of the pivot portions. And a pivot collar inserted through the pivot shaft, wherein the pivot collar is in contact with an inner race of the bearing member.

  According to the motorcycle of the first aspect, the pair of pivot portions provided on the swing arm that supports the rear wheel are arranged so as to sandwich the crankcase along the width direction of the vehicle body frame, and the pivot shaft is pivoted. The pivot shaft is inserted into the pivot hole of the crankcase, and the bearing member is provided between the outer peripheral surface of the pivot shaft and the inner peripheral surface of the pivot hole. The bulk which secures the bearing part which consists of a race and an outer race becomes unnecessary, and the bearing part in a swing arm can be made compact.

  According to the motorcycle of claim 2, the pivot shaft is swung by tightening the slit of the split tightening structure provided in the pivot portion of the swing arm so that the width of the slit is narrowed by the fastening member. Because it is attached to the pivot part of the arm, it can absorb the dimensional error and assembly error of the pivot shaft and swing arm, and can be assembled well, and the pivot shaft and swing arm are firmly and integrally fixed. be able to.

  Further, according to the motorcycle according to claim 3, the bearing, which is a bearing member, is interposed between the outer peripheral surface of the pivot shaft and the inner peripheral surface of the pivot hole of the crankcase, and is inserted through the pivot shaft. Since the pivot collar is in contact with the inner race of the bearing, the swing arm can be easily positioned in the vehicle width direction. In addition, since the swing arm is fastened with the pivot shaft to position the swing arm in the vehicle width direction, the fastening member is tightened to fix the pivot portion to the swing arm.

1 is an overall view showing an embodiment of a motorcycle according to the present invention. Sectional view of swing arm cut along a plane that passes through the pivot shaft and rear axle (A) is an enlarged view as viewed from the direction III in FIG. Enlarged view of part IV in Fig. 2 Plan view of the drive shaft Side view of drive shaft (A) is a top view of the eccentric adjuster, (B) is a side view as seen from the B direction in (A). (A) And (B) is a top view which shows the specific example of a drive shaft part. The top view which shows the modification of a drive shaft part

Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to the drawings.
It should be noted that the drawings are viewed in the direction of the reference numerals, and in the following description, front, rear, left and right, and top and bottom are in accordance with the direction seen from the driver, and the front of the vehicle is Fr, rear is Rr, left is L, and right is R, upper is shown as U, and lower is shown as D.

FIG. 1 is an overall view showing an embodiment of a motorcycle 10 according to the present invention.
As shown in FIG. 1, the motorcycle 10 of this embodiment includes a body frame 11. The vehicle body frame 11 includes a head pipe 12 provided at the front end portion of the vehicle, a main frame 13 extending rearward from the upper end portion of the head pipe 12, and a seat extending rearward from the rear end portion of the main frame 13. Rails 14 and 14 (only the reference numeral 14 on the front side is shown), down frames 15 and 15 (only the reference numeral 15 on the front side is shown) extending obliquely downward from the lower portion of the head pipe 12, and these down frames 15 , 15 and a rear frame 16, 16 (only reference numeral 16 on the front side is shown) for connecting the rear ends of the seat rails 14, 14.

  A front fork 17 is attached to the head pipe 12 so as to be steerable (rotatable). A steering handle 18 is attached to the front fork 17 at the top, and a front wheel 19 is rotatably attached to the lower end. Therefore, by operating the steering handle 18 to the left and right, the traveling direction of the front wheel 19 can be changed and steered.

  In a space surrounded by the main frame 13 and the down frame 15, an engine 22 as a power unit 21 is disposed. A crankcase 23 that also serves as an oil pan and a mission case is provided at a lower portion and a rear portion of the engine 22.

  A pivot shaft 31 (hidden by the rear frame 16), which will be described in detail later, is attached through the rear end 231 of the crankcase 23. The pivot shaft 31 rotatably supports the front end of a swing arm 32 that rotatably supports the rear wheel 24 at the rear end.

The rear wheel 24 is rotatably supported by a rear wheel axle 241 provided on the swing arm 32. A bracket 321 (see also FIG. 6) protrudes upward from the front portion of the swing arm 32, and the rear cushion unit 25 is between the upper end portion of the bracket 321 and the rear end portion 131 of the main frame 13. Is provided.
The angle between the line connecting the center of the pivot shaft 31 to the position where the rear cushion unit 25 is attached to the bracket 321 and the expansion / contraction axis 251 of the cushion unit 25 is approximately 90 degrees, so When the cushion unit 25 expands and contracts with the swing of the swing arm 32, the rear cushion swing angle at which the cushion unit 25 swings with respect to the vehicle body frame 11 around the mounting position 25A with respect to the vehicle body frame 11 is minimized. The space required for rocking the rear cushion is minimal, and the cushion rod 25B constituting the cushion unit 25 is less likely to be subjected to bending stress, so that cushion operability is improved.

  A gear case 26 is provided on the side (left side) of the rear wheel 24, and the output of the engine 22 is transmitted to the rear wheel 24 between the gear case 26 and the output shaft 221 of the engine 22 (see FIG. 5). A drive shaft portion 40, which will be described later in detail, is provided in the front-rear direction on the left side of the rear wheel 24.

  A headlight 57 is attached in front of the head pipe 12 toward the front. A fuel tank 51 is attached on the main frame 13, and a driver seat 52 and a passenger seat 53 are attached on the seat rail 14. A rear fender 54 that covers the rear wheel 24 is attached to the rear of the seat rail 14, and a taillight 55 and a rear turn signal 56 are attached to the rear part of the rear fender 54.

FIG. 2 shows a sectional view of the swing arm 32 cut along a plane passing through the pivot shaft 31 and the rear wheel axle 241.
As shown in FIG. 2, the rear end portion 231 of the crankcase 23 is provided with a pivot hole 232 penetrating in the width direction of the vehicle body frame 11 (vertical direction in FIG. 2), and the pivot shaft 31 is inserted therethrough. ing. Bearings 33 and 33 as bearing members are provided between the outer peripheral surface of the pivot shaft 31 and the inner peripheral surface of the pivot hole 232, and the pivot shaft 31 is rotatably supported in the pivot hole 232. The pivot shaft 31 is attached to the rear end 231 of the crankcase 23 and has protrusions 311 and 312 on the left and right.
As the bearing member, in addition to the bearing 33, a bush or the like that can rotate the pivot shaft 31 with respect to the crankcase 23 can be used.

  The swing arm 32 has a main body portion 322 and left and right arm portions 323 and 324 extending rearward from both left and right outer sides of the main body portion 322, and has an overall U-shape. Both end portions of the rear wheel axle 241 are fixed between the rear end portions of the arm portions 323 and 324 by nuts 243, and the rear wheel 24 is rotatably supported with respect to the rear wheel axle 241 via a bearing 242. The

  At the front end of the main body 322 of the swing arm 32, a pair of left and right pivot parts 34, 34 are provided protruding forward. The pair of pivot portions 34, 34 are provided so as to sandwich the rear end portion 231 of the crankcase 23 along the width direction of the vehicle body frame 11, and an insertion hole 341 through which the pivot shaft 31 is inserted is formed. . The protrusions 311 and 312 of the pivot shaft 31 are attached to the insertion hole 341.

3A is an enlarged view seen from the direction III in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line BB in FIG.
As shown in FIG. 3, the pivot portion 34 is divided into an upper pivot portion 344 and a lower pivot portion 345 by a slit 343 that continues from the outer side 342 of the pivot portion 34 to the inner surface of the insertion hole 341. Each of the upper and lower pivot portions 344 and 345 is provided with plate-like split fastening portions 346 and 347 that project forward, respectively. The bolts 348 that are fastening members penetrate through both the split fastening portions 346 and 347 in the vertical direction, and A nut 349 is provided.
Although FIG. 3 shows a case where the slit 343 is a horizontal straight line, the slit 343 may have other shapes.
Further, a female screw may be cut directly on the split tightening portion 347 without using the nut 349.

  Accordingly, when the swing arm 32 and the pivot shaft 31 are joined, the protruding portions 311 and 312 of the pivot shaft 31 are inserted into the insertion holes 341 of the pivot portion 34. Then, the bolt 348 and the nut 349 of the upper and lower split tightening portions 346 and 347 are fastened, the width dimension of the slit 343 is narrowed, and the pivot shaft 31 is sandwiched between the upper and lower pivot portions 344 and 345. In this way, the swing arm 32 is integrally fixed to the pivot shaft 31 by fixing the pivot portion 34 to the pivot shaft 31.

FIG. 4 is an enlarged view of a portion IV in FIG.
As shown in FIG. 4, a pivot collar 35 is inserted through the pivot shaft 31 between the rear end portion 231 of the crankcase 23 and the pivot portion 34 on one side (left side in FIG. 2) of the swing arm 32. The pivot collar 35 has a cylindrical shape having an L-shaped peripheral wall as a whole, one end surface abuts on the side surface of the pivot portion 34, and the other end surface in the pivot hole 232 of the rear end portion 231 of the crankcase 23. The end of the pivot shaft collar 31A that accommodates the pivot shaft 31 is in contact with the end surface.

The bearing 33 is provided with a plurality of pivot collars 35 fixed to the outer peripheral surface of the pivot shaft 31 and a cylindrical outer race 333 fixed to the inner peripheral surface of the pivot hole 232 of the crankcase 23 along the circumferential direction. It is rotatably supported via a rolling element 332.
That is, the pivot shaft 31 is rotatable with respect to the crankcase 23 and not with respect to the pivot portion 34 because the pivot collar 35 fixed to the pivot shaft 31 functions as an inner race of the bearing 33. become.

FIG. 5 shows a plan view of the drive shaft portion 40.
As shown in FIG. 5, the drive shaft portion 40 is coaxial with the first drive shaft and the first drive shaft 42 connected to the output shaft 221 of the engine 22 via a first universal joint 41 such as a universal joint. The second drive shaft 43 is disposed. The second drive shaft 43 is connected to the first drive shaft 42 via the spline portion 44, and is movable along the axial direction (front-rear direction) in a state in which relative rotation with respect to the first drive shaft 42 is restricted. It has become.
Here, the drive shaft portion 40 is housed inside the swing arm 32, and the swing arm 32 serves as a cover for protecting the drive shaft portion 40.

  A bearing portion 45 is interposed between the inner peripheral surface of one of the first drive shaft 42 and the second drive shaft 43 and the outer peripheral surface of the other of the first drive shaft 42 and the second drive shaft 43. Has been. The bearing portion 45 restricts unnecessary movement of the first drive shaft 42 and the second drive shaft 43 in the relative radial direction.

  The bearing portion 45 is provided on the first drive shaft 42 side (that is, on the front side) with respect to the spline portion 44 and on the second drive shaft 43 side (that is, on the rear side) with respect to the spline portion 44. The second bearing 452 is provided. The bearing portion 45 is press-fitted into one of the first drive shaft 42 and the second drive shaft 43. That is, the first bearing portion 451 is press-fitted into the first drive shaft 42, and the second bearing portion 452 is press-fitted into the second drive shaft 43.

FIG. 6 shows a side view of the drive shaft portion 40.
As shown in FIG. 6, the gear case 26 has a substantially disk shape as a whole, and can rotate with respect to the rear wheel axle 241 and the swing arm 32 around the rear wheel axle 241. A torque rod mounting bracket 261 protrudes outward from the gear case 26, and a torque rod 27 that restricts the rotation of the gear case 26 is mounted between the torque rod mounting bracket 261 and the rear frame 16. The torque rod 27 may be provided with an adjusting mechanism for adjusting the length of the torque rod 27 on the rear wheel 24 side or the gear case 26 side.

  The torque rod 27 is attached to the gear case 26 via an eccentric adjuster 28 (also a snail cam), and the angle of the gear case 26 can be easily adjusted by rotating the eccentric adjuster 28.

  For example, as shown in FIGS. 7A and 7B, the eccentric adjuster 28 has two disks 281 that sandwich the gear case 26. The disc 281 is provided with a mounting hole 283 that is eccentric from the center of rotation 282, and the connecting pipe 284 connects the mounting holes 283 of both discs 281 and 281. A plurality of protrusions 285 projecting inward are provided on the outer peripheral edge of each disk 281, and the protrusions 285 are fitted into recesses (not shown) provided at predetermined positions of the gear case 26, so that the eccentric The rotational position of the adjuster 28 is determined.

  Therefore, the rear end of the torque rod 27 is temporarily attached to the mounting hole 283 (connection pipe 284), and the disk 281 is rotated to adjust the positional relationship between the mounting position of the torque rod 27 and the mounting position of the gear case 26. Thereafter, the torque rod 27 is finally tightened in the mounting hole 283 to fix the eccentric adjuster 28 to the gear case 26. Thereby, the rotation angle with respect to the rear-wheel axle 241 of the gear case 26 can be adjusted.

8A and 8B show specific examples of the drive shaft portion 40. FIG.
In the drive shaft portion 40A shown in FIG. 8A, bushes 461 and 462 are used as the first bearing 451 and the second bearing 452. A seal 463 is provided at the front end of the bush 461 and the rear end of the bush 462.
The drive shaft portion 40A is biased in a direction in which the first drive shaft 42 and the second drive shaft 43 are separated from each other by a compression spring 44A provided between the first drive shaft 42 and the second drive shaft 43.
The compression spring 44 </ b> A is provided at a position surrounding the spline portion 44 between the bush 461 and the bush 462 and is covered by the second drive shaft 43.

Further, in the drive shaft portion 40B shown in FIG. 8B, a metal bush 471 is used as the first bearing portion 451, there is no second bearing portion, and a seal 472 is provided.
The drive shaft portion 40B is urged in a direction in which the first drive shaft 42 and the second drive shaft 43 are separated from each other by a compression spring 44B provided between the first drive shaft 42 and the second drive shaft 43.
The compression spring 44B is provided at a position surrounding the spline portion 44 between the metal bush 471 and the small diameter portion 43A, and is covered by the second drive shaft 43.

As described above, according to the motorcycle 10 of the present embodiment, the pair of pivot portions 34, 34 provided on the swing arm 32 that supports the rear wheel 24 causes the crankcase 23 to extend in the width direction of the vehicle body frame 11. The pivot shaft 31 is inserted into the insertion hole 341 provided in the pivot portion 34, the pivot shaft 31 is inserted into the pivot hole 232 of the crankcase 23, and the pivot shaft 31 is pivoted to the outer peripheral surface of the pivot shaft 31. Since the bearing 33 is provided between the inner peripheral surface of the hole 232, the pivot shaft 31 can rotate smoothly with respect to the crankcase 23, and the axial displacement of the pivot shaft 31 can be prevented.
Therefore, the bulk of securing the bearing portion composed of the collar 35 functioning as the inner race and the outer race 333 is not required, and the bearing portion in the swing arm can be made compact.

  Further, according to the motorcycle 10 of the present embodiment, the slit 343 having the split tightening structure provided in the pivot portion 34 of the swing arm 32 is tightened with the bolt 348 and the nut 349 so that the width dimension of the slit 343 is narrowed. Thus, the pivot shaft 31 is attached to the pivot portion 34 of the swing arm 32, so that it is possible to absorb the dimensional error and the assembly error of the pivot shaft 31 and the swing arm 32, and to obtain a good assemblage and to obtain the pivot shaft 31. And the swing arm 32 can be firmly and integrally fixed.

  Furthermore, according to the motorcycle 10 of the present embodiment, the bearing 33 is interposed between the outer peripheral surface of the pivot shaft 31 and the inner peripheral surface of the pivot hole 232 of the crankcase 23 and is inserted through the pivot shaft 31. Since the pivot collar 35 is in contact with the end face of the bot shaft collar 31A, the swing arm 32 can be easily positioned in the vehicle width direction.

  Further, after the pivot shaft 31 is tightened and the swing arm 32 is positioned in the vehicle width direction, the bolt 348 and the nut 249 are tightened to fix the pivot portion 34 to the swing arm 32, so that assembly is facilitated.

  Further, since the axial directions of the pivot shaft 31 and the crankcase 23 are the same, the axial force of the swing arm 32 can be used as the axial force of the crankcase 23.

  The motorcycle 10 of the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.

  For example, in the above-described embodiment, a bush or a metal bush is used as the first bearing and the second bearing between the first drive shaft and the second drive shaft, and the drive shaft portion provided with a seal is illustrated. However, the drive shaft portion 40C shown in FIG. 9 is also included in the present invention.

That is, the drive shaft portion 40C shown in FIG. 9 is compressed to a position surrounding the spline portion 44 exposed between the first drive shaft 42 and the second drive shaft 43 without the bush, metal bush, and seal described above. A spring 44A is provided. The compression spring 44 </ b> A is covered with a bellows-like boot that is stretched between the first drive shaft 42 and the second drive shaft 43.
Since such a drive shaft portion 40C can use, as the spline portion 44, a portion where the bush, the metal bush, and the seal are arranged in the drive shaft portions 40A and 40B, the drive shaft portion 40A exemplified in the above-described embodiment. Compared with 40B, the meshing dimension of the spline portion 44 can be ensured to be long, so that the meshing strength can be maintained even if the first drive shaft 42 and the second drive shaft 43 are relatively separated from each other.

DESCRIPTION OF SYMBOLS 10 Motorcycle 11 Body frame 22 Engine 23 Crankcase 232 Pivot hole 24 Rear wheel 31 Pivot shaft 32 Swing arm 34 Pivot part 341 Insertion hole 33 Bearing (bearing member)
342 Outside 343 Slit 348 Bolt (fastening member)
349 Nut (fastening member)
35 Pivot color

Claims (3)

The engine mounted on the body frame,
A pivot shaft supported by the crankcase of the engine;
A swing arm supported by the pivot shaft and having a swingable rear end;
In a motorcycle provided with a rear wheel supported on the rear end side of the swing arm,
A pair of pivot portions provided on the swing arm are arranged so as to sandwich the crankcase along the width direction of the body frame,
The pivot shaft is inserted into the insertion hole of the pivot portion and the pivot hole of the crankcase, and a bearing member is provided between the outer peripheral surface of the pivot shaft and the inner peripheral surface of the pivot hole. A motorcycle characterized by that. A slit continuous from the outside of the pivot part to the inner surface of the insertion hole;
A fastening member for fastening the pivot portion so as to narrow the width dimension of the slit,
The motorcycle according to claim 1, wherein the pivot shaft and the swing arm are integrally fixed by the fastening member. The bearing member is a bearing;
A pivot collar that is interposed between the crankcase and one of the pivot portions and inserted through the pivot shaft;
The motorcycle according to claim 2, wherein the pivot collar is in contact with an inner race of the bearing member.

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