JP4820252B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle including a shaft drive device that transmits an output of a power unit to a rear wheel.

There is known a motorcycle in which a rear wheel and a gear case are provided at a rear end portion of a rear fork, and an output of a power unit is transmitted to a rear wheel via a drive shaft and a gear case (see, for example, Patent Document 1).
JP-A-62-43388 (FIG. 2)

In FIG. 2 of Patent Document 1, the motorcycle is provided with a rear wheel and a gear case 15 at the rear end of the rear fork, and the output of the power unit is transmitted to the rear wheel via the propulsion shaft 28 and the gear case 15 as a drive shaft. This is the vehicle.
The gear case 15 is supported by the axle 13 and is prevented from rotating by a torque rod 32 extending rearward from the frame 2.

  When replacing the tire, the axle 13 is pulled out and the rear wheel is removed from the rear fork. At this time, it is preferable from the viewpoint of protection of the gear case 15 that the gear case 15 is manually supported or bound with a wire or the like so that the gear case 15 does not fall off.

Supporting by hand increases the number of workers because it takes extra manpower. Further, when binding with a wire or the like, binding and releasing work occurs, so the work time is extended and the number of work steps increases.
An increase in the number of work steps is not preferable because it leads to product costs.

  An object of the present invention is to provide a motorcycle capable of suppressing an increase in the number of work steps in a motorcycle including a shaft drive device.

According to the first aspect of the present invention, a rear fork is provided on the body frame so as to be swingable up and down, a rear wheel is provided at a rear end portion of the rear fork, a gear case is provided on a side of the rear wheel, and an output of the power unit is driven. In a motorcycle that transmits to a rear wheel via a shaft and a gear case, the gear case is supported by a rear wheel axle that supports the rear wheel and is engaged with a rear fork by a pin member, and the pin member is a gear case. The bolt head has a diameter larger than the opening provided in the rear fork, the length between the outer surface of the rear fork and the outer surface of the gear case is D, and the neck of the shaft portion of the bolt When the lower length is L and the length of the non-threaded portion is Dtd, D <Dtd is satisfied .

The invention according to claim 2 is characterized in that the bolt is disposed at the same height as the rear wheel axle .

The invention according to claim 3 is characterized in that the bolt is arranged behind the rear wheel axle.

The invention according to claim 4 is characterized in that the bolt is disposed at a lower portion of the rear fork.

In the invention according to claim 1, the gear case is hung on the rear fork by the pin member.
Even if the rear wheel axle is pulled out, there is no risk of the gear case falling off the rear fork. When pulling out the rear wheel axle, there is no need to manually support the gear case or bind the gear case to the rear fork, so there is no need to increase the work man-hours.

In the invention according to claim 2, in the head of the bolt and so as to close the opening provided in the rear fork. This opening is not visible from the outside, and the appearance of the rear fork can be enhanced. In addition, since the bolt head also serves as an axial stopper, the rear wheel assembly and the final gear assembly can be prevented from moving together when the rear wheel assembly is removed.

In the invention according to claim 3, the bolt is arranged behind the rear wheel axle. In the rear fork, the part behind the rear wheel axle has few attached parts, and the operator can easily reach out. Since the bolt is arranged at such a site, the bolt can be attached and detached very easily, and the working cost can be reduced.

In the invention according to claim 4, the bolt is arranged at the lower portion of the rear fork. Since the lower part of the rear fork is behind the rear fork, even if a bolt is arranged in this part, the bolt becomes inconspicuous and the appearance of the rear fork can be improved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a left side view of a motorcycle according to the present invention.
The motorcycle 10 includes a body frame 11, a head pipe 13 provided at the front end of the vehicle, a main frame 14 extending rearward from the head pipe 13, and a rear end of the main frame 14. Seat rails 15, 15 extending rearward from the section (only the reference numeral 15 on the front side is shown), and down frames 16, 16 extending only obliquely downward from the head pipe 13 (only the reference numeral 16 on the front side is shown). , Rear frames 17 and 17 (only the reference numeral 17 on the front side is shown) connecting the rear ends of the down frames 16 and 16 and the rear ends of the seat rails 15 and 15, and pivot shafts on the rear frames 17 and 17. 19 is rotatably attached, and a rear fork 21 is attached so as to be swingable up and down around the pivot shaft 19, and a front portion 22 of the rear fork 21. A vehicle composed of a rear cushion unit 25 which connects the rear 23 of the main frame 14.

  In the motorcycle 10, a front fork 28 is attached to the head pipe 13 so as to be steerable, a front wheel 29 is rotatably attached to a lower end of the front fork 28, a steering handle 31 is attached to an upper portion of the front fork 28, and a main frame. 14 and the down frame 16, an engine 33 as a power unit 32 is disposed, a rear wheel 35 is rotatably attached to the rear end 21 b of the rear fork 21, and a rear wheel axle that supports the rear wheel 35 is supported. A shaft drive device 40 that transmits the driving force of the engine 33 to the rear wheel 35 is disposed between the engine 36 and the engine 33.

  The engine 33 is a V-type two-cylinder engine that includes a crankcase 41 and two cylinder portions 42F and 42R raised from the crankcase 41. The fuel supply device, exhaust pipe, and silencer are omitted.

  45 is a fuel tank, 46 is a driver's seat, 47 is a rear fender, 48 is a headlight, 49 is a taillight, 51 and 51 (only the reference 51 is shown) is a rear turn signal, and 52 is a vehicle body frame 11. It is a gusset member.

FIG. 2 is a rear left side view of the motorcycle according to the present invention.
In the motorcycle 10, a rear fork 21 is provided so as to be swingable up and down via a pivot shaft 19 from a rear frame 17 constituting a part of the body frame 11, and a rear wheel 35 is provided at a rear end portion 21b of the rear fork 21. A gear case 54 is provided on the side of the rear wheel 35, a drive shaft 56 is provided between the gear case 54 and the output shaft 55 of the engine 33 as the power unit 32, and the output of the engine 33 is connected to the drive shaft 56 and the gear case. This is transmitted to the rear wheel 35 via 54.

  The gear case 54 is supported by a rear wheel axle 36 provided at the rear end portion 21 b of the rear fork 21 and is prevented from rotating by a torque rod 57 that connects the outer peripheral portion 54 g of the gear case 54 and the rear fork 21. ing.

A rear frame 61 extends rearward from the seat rails 15 and 15 (only the reference numeral 15 on the front side in the figure), and a rear fender 47, a passenger seat 62, and the like are attached to the rear frame 61.
In the figure, 63 is a bracket that is provided at the rear of the main frame 14 and holds the upper end 25t of the rear cushion unit 25.

  FIG. 3 is a cross-sectional view for explaining the shaft drive device and its peripheral portion of a motorcycle according to the present invention. Hereinafter, the structure of the shaft drive device 40 will be described first, and then the rear fork 21 that supports the shaft drive device 40 and the rear wheel 35 will be described.

  The shaft drive device 40 is a device that plays a role of changing the direction of the drive force of the drive shaft 56 and the drive shaft 56 and transmitting it to the rear wheel 35. The structure of the shaft drive device 40 includes a drive shaft 56 attached to the output shaft 55 of the engine (reference numeral 33 in FIG. 2) via a universal joint 65, and a drive shaft side gear 66 attached to the rear end portion 56b of the drive shaft 56. The drive gear 67, the final driven gear 68 that meshes with the drive gear 67 and changes the direction of the driving force, and the gear case 54 that houses the gears 67 and 68 are mainly configured.

The final driven gear 68 is press-fitted into the sleeve 73. The sleeve 73 is supported by bearings 94 and 96. A damper holder 74 is attached to the sleeve 73 and rotates integrally with the sleeve 73, and a damper member 75 is attached to the damper holder 74 via a bolt 77.
A bearing 72 is disposed on the outer periphery of the rear wheel axle 36 via a spacer 71, and a final gear unit including the gear case 54 is supported by the bearing 72 and another bearing 95.

  A shock absorber is provided between the final driven gear 68 and the rear wheel 35. In the present embodiment, the shock absorber is a damper member 75. The damper member 75 is interposed between the final driven gear 68 and the hub 76 of the rear wheel 35 to transmit the torque of the drive shaft 56 to the rear wheel 35 and to reduce shock due to torque fluctuation.

  The gear case 54 includes a main body 81 and a lid 82 that covers the main body 81 from the inside of the vehicle to the outside. Then, the lid portion 82 is aligned with the main body portion 81 and fixed with the fastening member 83. A gear chamber 84 is formed inside the gear case 54, and a drive gear 67 and a final driven gear 68 that meshes with the drive gear 67 are disposed in the gear chamber 84. The gear chamber 84 includes an oil injection hole 85 through which oil is injected. The oil injection hole 85 is normally closed with a cap 86.

  A dust guard plate 87 as a ring member 88 is attached to the lid portion 82 from the inside, and a breather pipe 89 that communicates the gear chamber 84 and the atmosphere is attached to the dust guard plate 87.

  The gear case 54 is supported by the rear wheel axle 36 that supports the rear wheel 35, and is engaged with the rear fork 21 by the pin member 141. The pin member 141 is disposed behind the rear wheel axle 36.

  In the rear fork 21, the rear part of the rear axle 36 has almost no attached parts, and the operator can easily reach out. Since the pin member 141 is arranged in such a part, the detaching operation of the pin member 141 can be performed very easily, and the operation cost can be reduced.

  In this embodiment, the pin member 141 is a bolt 142 that is screwed into the gear case 54, and the head portion 142 a of the bolt 142 has a larger diameter than the opening 143 provided in the rear fork 21.

The pin member 141 is a bolt 142 to be screwed into the gear case 54. Since the head 142a of the bolt 142 has a larger diameter than the opening 143 provided in the rear fork 21, the bolt fork 142a opens the rear fork 21. 143 can be made invisible.
Since the opening 143 of the rear fork 21 becomes invisible by the bolt head 142a, the appearance of the rear fork 21 and its peripheral portion can be improved. Further, since the head of the bolt 142 also serves as an axial stopper, it is possible to prevent the final gear assembly from moving together when the rear wheel assembly is removed.

  In the drawing, 91 to 94, 96 and 97 are bearings, 101 to 105 are seal members, 107 is a disc brake unit, 108 is a disc brake plate, and 109 is a nut for fixing the rear wheel axle 36 to the rear fork 21.

  The rear fork 21 includes one extending part 111, the other extending part 112, and a cross part 113 that connects the one extending part 111 and the other extending part 112.

One extension part 111 and the cross part 113 are integrally formed by casting. The other extending portion 112 is obtained by connecting a solid member 135 to a square pipe 134.
That is, the rear fork 21 is formed by connecting a plurality of members, and the connecting method of these members is by welding. By making the rear fork 21 into a divided configuration, it is possible to easily perform casting of a portion forming the one extending portion 111 and the cross portion 113.

The operation of the shaft drive device described above will be described next.
FIG. 4 is a diagram for explaining the operation of the pin member according to the present invention. The nut is removed and the rear wheel axle 36 is removed.

Conventionally, when the rear wheel axle 36 is pulled out, there is no member supporting the gear case 54, so the gear case 54 may be supported manually or tied with a wire or the like so as not to fall off from the rear fork 21 toward the back of the figure. From the viewpoint of protection of the gear case 54, it is preferable.
Supporting it manually requires extra manpower, which increases man-hours. Further, when binding with a wire or the like, binding and releasing work occurs, so the work time is extended and the number of work steps increases.
In this regard, in the present invention, the gear case 54 is hung on the rear fork 21 by the pin member 141, so that when the rear wheel axle 36 is pulled out to remove the rear wheel 35, the gear case 54 is removed from the rear fork 21. There is no worry about dropping out. When the rear wheel axle 36 is pulled out, there is no need to manually support the gear case 54 and to bind the gear case 54 to the rear fork 21, so there is no concern that the number of work steps will increase.

FIG. 5 is an operational view of attaching the pin member according to the present invention to the rear fork.
In (a), when the length between the outer surface 21f of the rear fork 21 and the outer surface 54f of the gear case 54 is D, the bolt with the length of the shaft 151 below the neck and the length of the non-threaded portion Dtd 142 is prepared.
In (b), the bolt 142 was inserted into the opening 143 provided in the rear fork 21 and fastened to the female thread portion 152 of the gear case 54.

  The length D between the outer surface 21f of the rear fork 21 and the outer surface of the gear case 54 and the length Dtd of the non-threaded portion 153 of the bolt 142 are such that D <Dtd and the head of the bolt 142 and the rear fork Since the play is provided between the outer side surfaces 21f of the rear fork 21, there is no problem that when the bolt 142 is fastened, the head of the bolt 142 hits the outer side surface 21f of the rear fork 21 to tighten the rear fork 21. That is, the length D between the outer surfaces of the gear case 54 is not reduced by tightening the bolt 142.

  If the length D is reduced by fastening the bolt 142, the gear case 54 moves outward in the vehicle width direction, which affects the arrangement of the drive shaft (reference numeral 56 in FIG. 3) and the arrangement of the hub 76 of the rear wheel 35. This is not preferable.

  In this respect, since the length D between the outer surface 21f of the rear fork 21 and the outer surface of the gear case 54 is equal to the length D of the non-threaded portion 153 of the bolt 142, the rear fork is secured by fastening the bolt 142. The length between the outer surface 21f of the gear 21 and the outer surface of the gear case 54 does not change, and the arrangement of the drive shaft 56 and the arrangement of the hub 76 of the rear wheel 35 are not affected.

6 is a side view of a rear fork according to another embodiment, and FIG. 7 is a view taken along arrow 7 in FIG. Hereinafter, a description will be given with reference to FIGS.
A difference from the embodiment is that a torque arm 155 is extended obliquely downward from an intermediate portion 111m of one extension portion 111B of the rear fork 21B, and an outer peripheral portion 54g of the gear case 54 is connected to the torque arm 155 via a bolt 153. The mounting point is that the pin member 141 is a bolt 142B and is arranged below the rear fork 21B.

  Since the bolt 142B as the pin member 141 is disposed at the lower portion of the rear fork 21B, the lower portion of the rear fork 21B is behind the rear fork 21B. Therefore, even if the bolt 142B is disposed at this portion, the bolt 142B is not noticeable. The appearance of the rear fork 21B can be improved.

FIG. 8 is an operational view of attaching the pin member according to another embodiment to the rear fork.
In (a), a counterbore 158 is formed in the rear fork 21B, and a bolt 142B is prepared that is fastened to the female thread portion 159 of the gear case 54 through the counterbore 158. The bolt 142B has a non-threaded portion having a length Db on the shaft portion 151B.

In (b), the bolt 142 </ b> B was inserted into a counterbore 158 as an opening provided in the rear fork 21, and fastened to the female thread portion 159 of the gear case 54.
By fastening the bolt 142B, the length Db between the outer surface 21f of the rear fork 21 and the outer surface of the gear case 54 does not change, so the arrangement of the gear case 54 does not change. Since the arrangement of the gear case 54 does not change, the arrangement of the drive shaft 56 and the arrangement of the hub 76 of the rear wheel 35 remain the same.

  In the first aspect, the pin member may extend outward from the gear case and engage with a hole formed in the rear fork. Alternatively, the pin member may extend inward from the rear fork and engage with a hole opened in the gear case.

  The present invention is suitable for a motorcycle including a shaft drive device.

1 is a left side view of a motorcycle according to the present invention. 1 is a rear left side view of a motorcycle according to the present invention. 1 is a cross-sectional view illustrating a shaft drive device for a motorcycle according to the present invention and its peripheral portion. It is action | operation explanatory drawing of the pin member which concerns on this invention. It is an effect | action figure which attaches the pin member which concerns on this invention to a rear fork. It is a side view of the rear fork which concerns on another Example. FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6. It is an effect | action figure which attaches the pin member which concerns on another Example to a rear fork.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame, 21 ... Rear fork, 21f ... Rear end of rear fork, 35 ... Rear wheel, 36 ... Rear wheel axle, 40 ... Shaft drive device, 54 ... Gear case, 141 ... Pin member, 142 ... bolt, 142a ... bolt head, 143 ... opening.

Claims (4)

The rear fork (21) to the vehicle body frame (11) disposed for free up and down swinging, provided the rear wheel (35) to the rear end of the rear fork (21), the gear case on the side of the rear wheel (35) ( 54), in which the output of the power unit (32) is transmitted to the rear wheel (35) via the drive shaft (56) and the gear case (54) .
The gear case (54) is supported by a rear wheel axle (36 ) that supports the rear wheel (35), and is engaged with the rear fork (21) by a pin member (141) .
The pin member (141) is a bolt (142) screwed into the gear case (54), and the head of the bolt (142) has a larger diameter than the opening (142) provided in the rear fork (21). And
The length between the outer surface (21f) of the rear fork (21) and the outer surface (54f) of the gear case (54) is D, and the length under the neck of the shaft (151) of the bolt (142) is L. A motorcycle characterized in that D <Dtd when the length of the part is Dtd . The motorcycle according to claim 1, wherein the bolt (142) is arranged at the same height as the rear wheel axle (36) . The motorcycle (1) according to claim 1, wherein the bolt (142) is arranged behind the rear axle (36). The motorcycle according to claim 1, wherein the bolt (142) is arranged at a lower portion of the rear fork (21B) .

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