JPH0425431Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field This invention is based on the invention, in which the other end of the axle to which the rear wheel hub is fixed to one end is placed on one side of the rear wheel. The present invention relates to a rear wheel maintenance support device for a motorcycle supported by a rear fork.

(2) Prior Art Conventionally, in order to maintain the rear wheel of a motorcycle, it is common to use a stand that has a structure that supports both ends of the rear wheel so as to sandwich the rear wheel from both sides.

(3) Problems to be solved by the invention However, in a motorcycle in which the rear wheel is cantilevered by a rear fork on one side of the rear wheel in order to facilitate tire replacement and brake maintenance,
If a stand with a structure supporting both ends is used, the advantage of easy maintenance of the rear wheels cannot be utilized. Therefore, an air jack that supports the rear wheel on a cantilever (see special edition Cycle World, September 10, 1986, page 73) has also been put into practical use, but this requires power to lift the rear wheel. Yes, the structure is complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a support device for rear wheel maintenance of a motorcycle that has a simple structure and allows the rear wheel to be easily lifted.

B. Structure of the invention (1) Means for solving the problem According to the invention, there is provided a shaft that can be inserted into a hollow axle and a hub from the side opposite to the rear fork until the tip protrudes from the other end of the axle, and the shaft. and a stand that can cantilever support on the rear fork side, and the stand has a width equal to or larger than the width of the rear wheel, and the front part along the front-rear direction of the motorcycle is curved convexly toward the front along the front-rear direction. a ground frame which is provided with a curved part and a foot rest part at the rear; an upright frame which is installed upright on the ground frame near one end in the width direction on the rear fork side along the axis of the axle; and a cylindrical boss fixed to the upper part of the upright frame so as to insert the tip of the shaft at a distance larger than the radius of the rear wheel.

(2) Effect According to the above configuration, the shaft is inserted into the axle of the rear wheel while the rear wheel is in contact with the ground, and the curved part is connected to the ground while the shaft protruding from the axle is inserted into the boss of the stand. and push down the foot rest part of the grounding frame. Then, the stand rotates about the curved portion, the boss or shaft rotates upward, and the rear wheel is lifted upward. In this state, since there are no obstacles on the opposite side of the motorcycle from the rear fork, various maintenance operations such as attaching and detaching the rear wheel can be easily performed.

(3) Embodiment An embodiment of the present invention will be explained below with reference to the drawings. First, in FIG. 1, the rear wheel Wr of a racing motorcycle M is cantilevered by a rear fork 1 on one side thereof. , the rear wheel Wr is lifted up using the stand 2 and the shaft 3 and supported in a cantilever manner.

In FIG. 2, a hollow axle 4 has bearings 5, 6 at the rear end of a rear fork 1 of a motorcycle M.
The axle 4 is rotatably supported via the axle 4.
A driven sprocket 8, which is driven via a chain 7 from a power unit (not shown), is fixed to the sprocket. Further, a mounting collar 9 projecting outward in the radial direction is integrally provided near one end of the axle 4, and a plurality of bolts 10 are implanted into this mounting collar 9. On the other hand, the hub 11 of the rear wheel Wr has a through hole 12 into which one end of the axle 4 can be inserted, and a plurality of insertion holes 13 into which each bolt 10 can be inserted. Attach the rear fork 1 to each bolt 10 inserted into the insertion hole 13 while in contact with the mounting collar 9.
The hub 11 is fixed to one end of the axle 4 by screwing together the nuts 14 on the opposite side.
Moreover, in this installed state, one end of the axle 4 is connected to the through hole 1.
It is located in the through hole 12 so as to form a step with the inner surface of the hole 2.

Referring to FIGS. 3, 4, and 5, the stand 2 includes a grounding frame 15, an upright frame 16, and a boss 17.

The grounding frame 15 includes a pair of support parts 18 and 19 that are parallel to each other along the front-rear direction of the motorcycle M, a foot rest part 20 that connects the support parts 18 and 19 at the rear end along the front-rear direction, and Both support parts 18 are parallel to the footrest part 20 near the front end along the front-rear direction,
The supporting parts 18, 19 and the footrest part 20 are integrally formed by bending a bar material. Further, the connecting portion 21 is made of a bar material, and both ends of the connecting portion 21 are welded to the supporting portions 18 and 19. Moreover, both the support parts 18 and 19, the footrest part 20 and the connecting part 21 are on the same plane, and both the support parts 1
The distance between 8 and 19, that is, the width of the ground frame 15 is set to be larger than the width of the rear wheel Wr.

Grounding frame 1 along the front and back direction of the motorcycle M
Curved portions 22 and 23 connected to the front end portions of both support portions 18 and 19 are provided at the front portion of the support portion 5 in a convex arc shape toward the front.

The upright frame 16 is connected to the curved portion 22, and is formed in a triangular shape by connecting the curved portion 22 and the rear portion of the support portion 18. The top 16a of the upright frame 16 is formed to be smoothly curved, and one end of a cylindrical boss 17 is fixed to the lower part of the top 16a. Moreover, the distance l from the lower surface of the ground frame 15 to the axis of the boss 17 is set to be larger than the radius R of the rear wheel Wr.
Further, a substantially triangular auxiliary frame 24 whose lower end is fixed to the footrest part 20 and the connecting part 21 and which is inclined toward the upright frame 16 is arranged to support the middle part of the boss 17, and the boss 17 is connected to the ground frame. 15 is disposed substantially horizontally so as to be slightly inclined upward toward the other end in the width direction. The inclination angle α of the boss 17 with respect to the horizontal line is set to a small value of, for example, 5 degrees or less. Further, mounting parts 24a and 24b parallel to the footrest part 20 and the connecting part 21 are bent and integrally provided at the lower end of the auxiliary frame 24.
a and 24b are fixed to the inner surfaces of the footrest part 20 and the connecting part 21, respectively. As a result, boss 17
By bending the auxiliary frame 24 until the boss 17 becomes almost horizontal when the axle 4 is supported by the ground frame 15, the strength of the stand 2 is increased and the footrest is Protrusions on the upper and outer parts of the portion 20 and the connecting portion 21 can be avoided.

The shaft 3 is formed to have an outer diameter that allows it to be inserted into the axle 4, and has an engaging head 25 at one end that can engage with one end of the axle 4 within the through hole 12 in the hub 11. Installed in one piece. Further, at the other end of the shaft 3 protruding from the boss 17, an insertion hole 27 for removably inserting a lock pin 26 that can be engaged with the boss 17 is bored at right angles to the axis.

Next, the operation of this embodiment will be explained with reference to FIG. 6.
When maintaining the Wr, as shown by the solid line in Fig. 6, when the motorcycle M is in an upright state with the rear wheel Wr on the ground, the curved parts 22 and 23 are on the ground and the stand 2 is placed on the rear wheel. Shift the Wr from the rear to the front, and bring the boss 17 to a position that roughly corresponds to the axle 4 on the rear fork 1 side.

In this state, the shaft 3 is inserted into the hub 11 and the axle 4 from the side opposite to the rear fork 1, and the engagement head 25 is brought into contact with one end of the axle 4 so that the other end of the shaft 3 passes through the boss 17. Then, insert the lock pin 26 into the insertion hole 27. This prevents the shaft 3 from falling off the axle 4 and boss 17.

In this state, the footrest 20 is pressed downward with the foot. Then, the stand 2 is the curved part 2
2 and 23 as fulcrums, and by the lever principle, the rear wheel Wr is easily rotated upward and lifted as shown by the chain line. In this state, the grounding frame 15 is in contact with the ground over its entire surface,
The weight of the motorcycle M acts on the stand 2 from above to below within the range of the ground frame 15, so even if you remove your foot from the footrest 20, the stand 2
will not fall. Moreover, since the boss 17 was slightly inclined by the angle α, the boss 17 and the axle 4 are in a horizontal state when the motorcycle M is supported on a cantilever.

In this state, since there are no obstacles on the side opposite to the rear fork 1, maintenance work such as tire replacement on the rear wheel Wr can be performed extremely easily.

After the maintenance work is completed, it is only necessary to slightly push the motorcycle M forward, and as the motorcycle M moves forward slightly, the stand 2 will rotate around the curved parts 22 and 23 as fulcrums. Rear wheel Wr touches the ground. Then, by removing the lock pin 26 and pulling out the shaft 3 from the axle 4 and boss 17, the motorcycle M can move freely.

C. Effects of the invention As described above, according to the invention, there is provided a shaft that can be inserted into a hollow axle and a hub from the side opposite to the rear fork until its tip protrudes from the other end of the axle;
The shaft is provided with a stand capable of cantilevering the shaft on the rear fork side, and the stand has a width greater than or equal to the width of the rear wheel, and has a front portion extending in the front-rear direction of the motorcycle that is convex toward the front along the front-rear direction. a grounding frame provided with a curved portion and a footrest at the rear; an upright frame erected near one end in the width direction of the rear fork side along the axis of the axle; and a lower surface of the grounding frame. and a cylindrical boss that is fixedly installed in the upper part of the upright frame so that the tip of the shaft is inserted at a distance from the rear wheel that is larger than the radius of the rear wheel.
The structure is simple, and the rear wheel can be easily lifted and supported on a cantilever using input, making it possible to perform maintenance work on the rear wheel easily and quickly.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view showing the rear wheel support state, and FIG. 2 is a perspective view showing the rear wheel support state.
Fig. 3 is a side view of the stand, Fig. 4 is a left side view of Fig. 3, Fig. 5 is an exploded enlarged perspective view of the stand and shaft, and Fig. 6 shows the operating state. FIG. 1... rear oak, 2... stand, 3...
Shaft, 4...Axle, 11...Hub, 15...
Grounding frame, 16... Standing frame, 17...
Boss, 20...foot rest part, 22, 23...curved part, M...motorcycle, Wr...rear wheel.

Claims (1)

[Scope of utility model registration request] In a support device for rear wheel maintenance of a motorcycle in which the other end of an axle to which a rear wheel hub is fixed to one end is supported by a rear fork disposed on one side of the rear wheel, the rear wheel is hollowed out from the side opposite to the rear fork. a shaft that can be inserted into the axle and hub of the axle until its tip protrudes from the other end of the axle, and a stand that can support the shaft in a cantilever on the rear fork side, the stand having a width equal to or greater than the width of the rear wheel; The front part of the motorcycle along the front-rear direction is provided with a curved part that is convexly curved toward the front along the front-rear direction, and the rear part is provided with a ground frame with a footrest, and the rear fork extends along the axis of the axle. An upright frame is installed upright on the ground frame near one end in the width direction of the side, and the end of the shaft is fixedly installed in the upper part of the upright frame with a distance from the lower surface of the ground frame larger than the radius of the rear wheel. A support device for rear wheel maintenance of a motorcycle, characterized by comprising a cylindrical boss.