JPH0957658A - Maintenance stand for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the working efficiency when a rear wheel is replaced by arranging a pressing part to check rotation of a rear sprocket by pressing the rear sprocket round which a chain is wound by interposing the chain when a rear part of a motorcycle is floated. SOLUTION: A maintenance stand A is provided with a stopper body 33 as a pressing part to check rotation of a rear sprocket 2 by pressing the rear sprocket 2 round which a chain 2a is wound by interposing the chain 2a. Therefore, when a mechanic pushes the rear sprocket 2 round which the chain 2a is wound by the stopper body 33 after the rear sprocket 2 in a midair hanging condition is adjusted to a rear wheel mounting-demounting position, the rear sprocket 2 can be fixed to the rear wheel mounting-demounting position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle maintenance stand. Specifically, it relates to a motorcycle maintenance stand used exclusively for endurance racing machines.

[0002]

2. Description of the Related Art In an endurance racing machine, a center stand is not attached to a vehicle body for weight reduction. Therefore, the rear tire is exchanged using a dedicated maintenance stand.

By the way, in a general motorcycle,
While the disc plate or / and the rear sprocket are removed together with the rear wheel when the rear tire is replaced, in the endurance racing machine, in order to reduce the loss time due to the rear tire replacement,
A mechanism has been adopted that allows the rear swing arm to be removed with the disc plate and / or the rear sprocket left. For example, see Japanese Utility Model Laid-Open No. 62-12507.

FIG. 6 shows a rear end of a machine for endurance racing which employs such a mechanism, and a rear tire (not shown) is floated by using a maintenance stand (not shown).
It is a perspective view which shows the state which removed. FIG. 6 shows a connecting structure 1 of a rear sprocket and a rear wheel that allows the rear tire to be removed even when the rear sprocket 2 around which the chain 2a is wound is left on the rear swing arm 3.

The connecting structure 1 will be described with reference to FIG. 6. In the connecting structure 1, the rear sprocket 2 left on the rear swing arm 3 has a shape similar to a scallop shell, in other words, a U-shape. A housing 7 having a recessed portion 5 which becomes wider toward the opening side and has a shape such that the opening is connected by an arc is provided on the sprocket 2 on the rear wheel side surface 2b (or on the sprocket 2 by the plurality of screws 9). Is fixed to the recess 7a of the housing 7, and the recess 7a is provided in the rear wheel of the rear tire (not shown).
A convex portion (not shown) having a shape similar to that of a scallop shell that fits with a is fitted, and the rear sprocket 2 and the rear wheel are integrated by the fitting.

In FIG. 6 showing the state where the rear sprocket 2 is left on the rear swing arm 3, the reference numerals 11, 13, and 7a ₁ are provided coaxially with the rear sprocket 2 and the housing 7, respectively. These are the rear axle through hole, the rear axle through the rear axle through hole 11, and the opening of the recess 7a.

In order to release the connection between the rear sprocket 2 and the rear wheel (not shown) in such a structure 1 for connecting the rear sprocket and the rear wheel, first, the mechanic of the rear tire makes the vehicle open the opening 7a _{1 of the} recess 7a. Rotate the rear tire including the rear wheel so that it is directed diagonally upward and rearward (the direction indicated by arrow I in the figure). "Detachable position".).

After that, the rear axle 13 is loosened, the rear axle 13 is pulled out to such an extent that the rear sprocket 3 does not fall out, the axial support state of the rear wheel by the rear axle 13 is released, and the rear wheel is removed. At this time,
As shown in FIG. 6, the rear sprocket 2 hangs in a dangling state on the tip portion of the rear axle 13 when the chain 1 is wound.

Therefore, when the hand or a part of the body of the mechanic touches the rear sprocket 2 in such an unstable state, the rear sprocket 2 is displaced from the attaching / detaching position of the rear wheel, or the chain 1 is attached to the rear sprocket 2. It may come off from.

Therefore, when refitting a new rear tire including a rear wheel, it may be necessary to re-align the rear sprocket 2 with the attachment / detachment position of the rear wheel, or rewind the chain 1 around the rear sprocket 2. Therefore, the loss time may increase due to these factors.

[0011]

SUMMARY OF THE INVENTION The motorcycle maintenance stand according to the present invention has been invented in view of the above-mentioned circumstances. The problem to be solved is that the rear sprocket is left on the rear swing arm. In a motorcycle with a rear wheel that can be removed, the rear sprocket will rotate even if the mechanic touches the rear sprocket during the rear wheel replacement work after the rear tire is lifted using the maintenance stand on this motorcycle, Another object of the present invention is to provide a maintenance stand for a motorcycle in which the chain wound around the rear sprocket does not come off and the work efficiency at the time of rear wheel replacement can be improved.

[0012]

Means for Solving the Problems The maintenance stand for a motorcycle according to the present invention solves the above problems and is as follows. That is, the maintenance stand for a motorcycle according to the present invention according to claim 1 is a motorcycle in which the rear part of the motorcycle is floated and the rear tire of the motorcycle can be removed with the chain-wound rear sprocket left on the rear swing arm. In this maintenance stand, the maintenance stand supports the motorcycle by engaging a hook portion provided at a position off the rear axle axis of the rear swing arm, and when the rear portion of the motorcycle is floated, It is characterized in that the rear sprocket on which the chain is wound is pressed by the interposition of the chain, and a pressing portion for preventing rotation of the rear sprocket is provided.

Therefore, according to the maintenance stand for a motorcycle of the present invention according to claim 1, the maintenance stand is engaged with the hook portion provided at a position deviated from the rear axle axis of the rear swing arm. Since it supports motorcycles, lift the rear part of the motorcycle and then loosen the rear axle, pull out this rear axle to the extent that the rear sprocket does not slip out, release the rear wheel axle support state by the rear axle, and remove the rear wheel, The rear sprocket will hang from the tip of the rear axle in a suspended state when the chain is wound.

Further, since the motorcycle maintenance stand of the present invention is provided with the pressing portion for pressing the rear sprocket on which the chain is wound with the chain interposed, thereby preventing the rear sprocket from rotating. , The rear sprocket hanging in the suspended state,
It will not move due to the pressing part. Therefore, if the mechanic aligns the suspended rear sprocket to the desired position (rear wheel attachment / detachment position) and then pushes the chain-wound rear sprocket with the pressing part, the rear sprocket is fixed at the rear wheel attachment / detachment position. Become so. Therefore, even if the mechanic touches the rear sprocket during the rear wheel replacement work, the rear sprocket will not rotate or the chain wound around the rear sprocket will not come off, so work efficiency during rear wheel replacement will be improved. Can be increased.

Further, in the motorcycle maintenance stand according to a second aspect of the present invention, the pressing portion is provided with an elastic material for imparting elasticity toward the rear sprocket, and the elastic surface is repelled. The elastic force of the material is such that the rear sprocket is allowed to rotate when a rotational force of a predetermined amount or more is applied to the rear sprocket.

Therefore, according to the motorcycle maintenance stand of the second aspect of the present invention, the elastic force of the elastic material allows the rear sprocket to rotate when a rotational force of a predetermined amount or more is applied to the rear sprocket. Because of the size,
Even if the rear sprocket is prevented from rotating by the pressing portion in a state where it is displaced from the rear wheel attachment / detachment position, the rear sprocket can be appropriately rotated toward the rear wheel attachment / detachment position if the mechanic applies a rotational force above the predetermined amount. be able to. For this reason, the dangling state of the rear sprocket can be eliminated, and replacement of a new rear tire with a rear hole can be further facilitated.

Further, since the pressing portion is displaced by the elastic material, it can be applied to sprockets of different sizes.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a service stand of the present invention will be described in detail with reference to the drawings based on the illustrated embodiments. For the sake of explanation, the same parts as those described in the prior art will be designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is an overall side view showing a state in which the motorcycle 15 is equipped with the maintenance stand A according to the present invention, and FIG. 2 is a partially enlarged side view showing a state in which the motorcycle 15 is equipped with the maintenance stand A. 3 is an overall perspective view of the maintenance stand A, and FIG. 4 is FIG.
FIG. 5 is an enlarged view of a main part of FIG.

As shown in FIG. 1, the motorcycle 15 has a body frame 17 extending forward and backward as a skeleton, and front and rear wheels 15f and 15r are provided in front and rear thereof. The body frame 17 is a main frame 1 that encloses an engine 18 inside.
9 and a seat rail frame 21 extending rearward of the main frame 19.

The rear wheel 15r is pivotally supported by a rear axle 13 which is passed through the left and right arms 3L and 3R (only the left arm 3L is shown) of the rear swing arm 3. Further, hook portions 23 are provided at the rear end portions of the lower edges of the left and right arms 3L and 3R, that is, at positions off the axis of the rear axle 13.

The hook portion 23 is for lifting a rear wheel 15r, which is the rear portion of the motorcycle 15, by supporting a support pin 25a, which will be described later, of the maintenance stand A, and its tip is bifurcated. It is branched into a forked portion 23a.

The maintenance stand A has an engaging portion 25 that engages with the hook portion 23, as can be seen from FIGS. 3 and 4.
And the left and right L-shaped rods 27L, which have the engaging portions 25 respectively at their tip portions and support the left and right arms 3L and 3R of the rear swing arm 3 from the rear rear side via the hook portions 23, respectively. A connecting rod rod 29 that connects a pair of 27R and the corner portions 28 of the pair of L-shaped rods 27L and 27R.
And the rear ends of the pair of L-shaped rods 27L and 27R are connected to each other, and when the maintenance stand A is used, a C-shaped C is formed behind the rear wheel 15r of the motorcycle 15 to be stepped on by a mechanic (not shown). The L-shaped rod 30L and the L-shaped rod 27L are bridged to the later-described steel plates 27a of the L-shaped rods 27L and 27R and the pipe member 27b so as to form a triangular region T having the corners 28 of the L-shaped rod 27 as vertices. -Reinforcing rod 31 for reinforcing each of 27R and stopper body 33 attached to L-shaped rod 27L and having a V-shape as a pressing portion.
Basically consists of and.

The engaging portions 25 are left and right L-shaped rods 27L.2.
A support pin 25a, which is provided at the tip of the 7R and engages with the forked portion 23a of the hook portion 23, is formed so as to project toward the inside of the vehicle, and each support pin 25a is mutually opposite to the other L-shaped rod. It is adapted to face the support pin 25a. By engaging the support pins 25a with the bifurcated portions 23a of the hook portion 23, the maintenance stand A can be supported by the motorcycle 15.

As the name suggests, the L-shaped rods 27L and 27R are substantially L-shaped as a whole, and the steel plates 27a and the pipe members 27b (or two pipe members or two steel plates) are almost the same. It is formed by combining them so as to form an L shape, and the corner portions 28 that are the joint portions thereof are
A connecting rod 29 is rotatably attached.

A rotating wheel 29a is provided at both ends of the connecting rod 29.
-29a (only the left one is shown) is attached. These rotating wheels 29a, 29a are for moving the maintenance stand A, and when the motorcycle 15 is maintained using the maintenance stand A, the maintenance stand A is placed under the rear wheel 15r. It rotates to make it dive smoothly.

The C-shaped foot rod 30 also has a C-shape as its name suggests, and is formed by bending a pipe material into a substantially C-shape, and is housed in the pipe material 27b of the L-shaped rod 27. It can be installed freely or fixedly.
C-shaped foot rod 30 is replaced with L-shaped rod 27L / 27R pipe material 27
When it is installed in the b / 27b so that it can be stored, it can be made compact by storing the C-shaped foot rod 30 in the L-shaped rods 27L / 27R pipe members 27b / 27b when the maintenance stand A is not used. .

The reinforcing rod 31 is welded and fixed between the steel plate 27a of each of the L-shaped rods 27L and 27R and the pipe member 27b. One end of the reinforcing rod 31 is the steel plate 27a or the pipe member 27.
b rotatably attached to the other end of the steel plate 27
Alternatively, it may be attached to the pipe member 27a or the pipe member 27b to be removable. With such a structure, when the maintenance stand A is not used, the steel plate 27 at the other end of the reinforcing rod 31 is used.
a or the pipe member 27b, and the connecting rod rod 29 is overlapped with the steel plate 27a or the pipe member 27b with one end of the reinforcing rod 31 as the center of rotation, and the steel plate 27a of the L-shaped rod 27 and the pipe member 27b are connected to each other. The L-shaped rod 27 can be made compact by stacking the rods 29 around the rotation center.

When the maintenance stand A is used, the stopper body 33 pushes the rear sprocket 2 on which the chain 2a is wound from above the chain 2a (that is, with the chain 2a interposed), whereby the rear sprocket 2 is pushed. L-shaped rod 27
A column portion 35 that can be fixed to L or that can adjust the degree of inclination with respect to the L-shaped rod 27L in a stepwise manner by a ratchet joint (not shown); And an L-shaped base portion 37 (see FIGS. 4 and 5) extending upward, and an elastic material (spring) 39 in the axial direction with respect to the base portion 37.
The stopper part 41 is made of rubber and is displaced through the stopper part 41. The stopper part 41 is prevented from being disengaged from the base part 37, and the restriction metal part 43 is provided for guiding and moving the stopper part 41 in the axial direction of the base part 37. . The restriction fitting 43 is in the shape of a band wound around the circumference of the stopper portion 41, and is provided with a screw 45 on the back surface 37 of the base portion 37.
a. Since the stopper portion 41 is displaced through the elastic material 39, there is no problem even if the sprockets have different sizes. Further, what is denoted by reference numeral 47 in FIGS. 1 and 2 is a rear wheel.

The method of use and the working effects of the motorcycle maintenance stand A having the above-described structure will be described in order.

The support pins 25a of the motorcycle maintenance stand A are engaged with the bifurcated portions 23a of the hook portions 23 of the motorcycle 15. At this time, as shown in FIG. 1, the entire motorcycle maintenance stand A has the rotating wheel 29a in the grounded state and the steel plates 27a of the L-shaped rods 27L and 27R.
However, the portion of the C-shaped foot rod 30 that is seen from the side of the vehicle and the pipe members 27b of the L-shaped rods 27L and 27R are inclined to the front of the vehicle with the rotating wheel 29a as the base point.
The vehicle stands by behind the rear wheel 15r of the motorcycle 15 in a state in which the vehicle is tilted obliquely upward and rearward.

When the mechanic steps on the C-shaped foot rod 30 in the state of "1" with one of the left and right feet, the motorcycle maintenance stand A is for maintenance under the rear wheel 5r while the rotating wheel 29a rotates. The stand A is moved while smoothly submerged, and the rear wheel 15r of the motorcycle 15 is floated. At this time, the C-shaped foot rod 30 and the pipe members 27b of the L-shaped rods 27L and 27R are grounded except for the rear end portion of the C-shaped foot rod 30 (see FIG. 2). Since the rear end portion of the C-shaped foot rod 30 is floating, it becomes easy for the mechanic to put in the hand to pull out the maintenance stand A after finishing the maintenance.

Then, the rear wheel 15 is moved by the maintenance stand A.
As r floats, the stopper body 33 gradually approaches the rear sprocket 2 on which the chain 2a is wound, and finally, as shown in FIG. 2, below the rear sprocket 2 on which the chain 2a is wound. In the upright state, the rear sprocket 2 is pressed with the chain 2a interposed, thereby preventing the rear sprocket 2 from rotating.

When the rear axle 13 is loosened, the rear axle 13 is pulled out to such an extent that the rear sprocket 2 does not fall out, the pivotal support state of the rear wheel 47 by the rear axle 13 is released, and the rear tire 15r is removed from the rear swing arm 3. When the chain 2a is wound, it hangs in the suspended state on the tip portion of the rear axle 13.

The chain 2a is attached to the maintenance stand A.
Since the rolled rear sprocket 2 is pressed with the chain 2a interposed, and the stopper body 33 is provided as a pressing portion for preventing the rear sprocket 2 from rotating, the rear sprocket 2 hanging in a dangling state is provided. Is a stopper body 33.
It is pressed by the stopper portion 41 of the stopper body 33 and does not move.

Therefore, when the mechanic aligns the suspended rear sprocket 2 with the rear wheel attachment / detachment position, and pushes the rear sprocket 2 on which the chain 2a is wound by the stopper body 33, the rear sprocket 2
Will be fixed at the rear wheel attachment / detachment position,
Even if the mechanic touches the rear sprocket 2 during the replacement work of the rear wheel 47, the rear sprocket 2 will not rotate or the chain 2a wound around the rear sprocket 2 will not come off. The work efficiency of can be improved.

The stopper body 33 is the rear sprocket 2
The rear sprocket 2 has a resilience material 39 that imparts resilience to the rear sprocket 2. When the rear sprocket 2 is rotated by a predetermined amount or more, the resilience material 39 has a size that allows the rear sprocket 2 to rotate. Therefore, even if the rear sprocket 2 is fixed by the stopper body 33 in a state of being displaced from the rear wheel attachment / detachment position, the rear sprocket 2 can be attached to the rear wheel attachment / detachment position if the mechanic applies a rotational force of a predetermined amount or more. Can be rotated as appropriate. That is, since the rear sprocket 2 can be repositioned to the rear wheel attachment / detachment position even when the rear sprocket 2 is fixed by the pressing portion, it is possible to eliminate the dangling state of the rear sprocket 2 and thus the rear hole 47. The replacement of the new rear tire 15r can be made easier.

When the maintenance stand A is removed and the maintenance stand A is removed, if the mechanic holds the rear portion of the C-shaped foot rod 30 and pulls it out toward the rear of the vehicle, the hook portion 23 and the support pin 25a are automatically engaged. Will come off. Further, in this embodiment, the stopper body 33 has been described as holding down the rear sprocket, but it may be applied to the disc plate of the disc brake.

[0038]

According to the motorcycle maintenance stand of the first aspect of the present invention, the rear sprocket rotates or winds around the rear sprocket even if the mechanic touches the rear sprocket during the rear wheel replacement work. Since the chain that is attached will not come off, it is possible to improve work efficiency when replacing the rear wheel. With the motorcycle maintenance stand according to the second aspect of the present invention, the rear sprocket can be repositioned to the rear wheel attachment / detachment position even when the rear sprocket is fixed by the pressing portion, so that the rear sprocket is in a dangling state. This makes it easier to replace a new rear tire with a rear hole.

[Brief description of drawings]

FIG. 1 is an overall side view showing a state in which a motorcycle is about to be equipped with a maintenance stand according to the present invention.

FIG. 2 is a partially enlarged side view showing a state in which a motorcycle is equipped with a maintenance stand.

FIG. 3 is an overall perspective view of a maintenance stand.

FIG. 4 is a side view of FIG. 3;

5 is an enlarged view of a main part of FIG.

FIG. 6 is a perspective view showing a conventional connecting structure of a rear sprocket and a rear wheel.

[Explanation of symbols]

 A Motorcycle maintenance stand 2 Rear sprocket 2a Chain 3 Rear swing arm 15 Motorcycle 15r Rear tire 23 Hook part 33 Pressing part 39 Repellent material

Claims (2)

[Claims] 1. A maintenance stand for a motorcycle in which the rear tire of the motorcycle can be removed while the rear part of the motorcycle is floated and the chain-wound rear sprocket is left on the rear swing arm. The motorcycle is supported by engaging a hook portion provided at a position off the rear axle axis of the rear swing arm, and when the rear portion of the motorcycle is floated, the rear sprocket on which the chain is wound is attached to the chain. A maintenance stand for a motorcycle, characterized in that it is provided with a pressing portion that interposes and presses the rear sprocket to prevent rotation of the rear sprocket. 2. The pressing portion is provided with an elastic material that applies elasticity toward the rear sprocket, and
2. The motorcycle maintenance stand according to claim 1, wherein the resilience of the resilient material is large enough to allow rotation of the rear sprocket when a rotational force of a predetermined amount or more is applied to the rear sprocket.