JP2824300B2 - Rear wheel support structure for motorcycles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rear wheel support structure for a motorcycle in which the attachment and detachment of a rear wheel is considered.

(Prior Art) In a motorcycle having a pair of left and right rear arms, a rear wheel is rotatably supported on a rear axle suspended by the rear arm. A chain sprocket and a disc brake device are arranged, and the brake disc of the chain sprocket and the disc brake device and the hub of the rear wheel are respectively connected by left and right mechanical clutches.

Some motorcycles having the above-described configuration are configured so that the rear wheel can be replaced while the chain sprocket and the disc brake device are left on the rear arm side.

(Problems to be Solved by the Invention) However, in the motorcycle adopting the above configuration, the mechanical clutches are provided on the left and right, respectively. There is a problem that it cannot be easily incorporated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rear wheel support device for a motorcycle in which a rear wheel can be easily attached and detached.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a disk drive between a rear wheel rotatably supported by a rear axle suspended on a pair of left and right rear arms and one rear arm. A brake device and a chain sprocket are arranged with the disc brake device facing outward, fitted on the outer periphery of the rear axle, and one end of which supports the disc brake device and the chain sprocket by a collar fixed to the one rear arm. The hub of the rear wheel and the chain sprocket are connected by a mechanical clutch to form a motorcycle rear wheel support structure.

According to the present invention, when the rear axle is removed from the rear arm when replacing the rear wheel, the rear wheel is easily removed because the disc brake device and the chain sprocket are supported by the collar and remain on one of the rear arms. be able to.

Further, according to the structure of the present invention, since a single mechanical clutch is provided only on one of the right and left sides, the alignment between the hub of the rear wheel and the chain sprocket can be easily performed, and the rear wheel can be easily incorporated. be able to.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a rear portion of a rear arm of a motorcycle showing a rear wheel supporting structure according to the present invention (a sectional view taken along line II of FIG. 2), FIG. 2 is a side view thereof, and FIG. FIG. 4 is a sectional view taken along the line III-III, FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 2, and FIGS. 5 to 7 are views similar to FIG.

In FIGS. 1 and 2, 1-1 and 1-2 denote a pair of left and right rear arms extending parallel to each other in the front-rear direction of the vehicle body, and these rear arms 1-1 and 1-2 are integrally connected at their front ends. The front end is pivotally attached to a vehicle body frame (rear arm bracket) by a pivot shaft (not shown), and the intermediate portion is suspended on the vehicle body side via a link mechanism and a rear cushion (not shown).

A hollow axle-shaped rear axle 2 is suspended from the left and right rear arms 1-1 and 1-2, and a rear wheel 3 is rotatable via bearings 4 and 4 on the rear axle 2. It is supported by That is, the hub 5 of the rear wheel 3 is provided with a collar 6 inserted into the center of the hub, and short hollow end pieces 8 and 9 are fitted to both ends of the collar 6. The bearings 4 and 4 are incorporated on the outer peripheral sides of 8, 9. Thus, the above collar 6, end pieces 8, 9
And the pole bearings 4 and 4 are integrated into the hub 5 so that the collar 6 and the end pieces 8 and 9 are aligned in a straight line.
The rear wheel 3 is rotatably supported by the rear axle 2 as described above.

By the way, between one rear arm 1-1 and the rear wheel 3, a disc brake device 10 and a chain sprocket 11
Are arranged with the disc brake device 10 outside, and they are supported by a collar 12 extending inward from the rear arm 1-1. That is, the collar 12 is fitted around the outer end of the rear axle 2 on the rear arm 1-1 side, and one end thereof is fixed to the rear arm 1-1 side. A sprocket 11 is supported.

The chain sprocket 11 is rotatably supported on the collar 12 via two rows of bearings 15 and 15 incorporated on the outer periphery of the collar 12, and five guide pins are provided on the same pitch circle on the outer end surface thereof. 16… are protruded. The chain sprocket 11 and the hub 5 of the rear wheel 3
Are connected to each other via a mechanical clutch 17.

The mechanical clutch 17 includes a clutch inner 19 connected to an end surface of the hub 5 with a plurality of bolts 18 and a clutch outer 21 connected to an inner end surface of the chain sprocket 11 with a plurality of screws 20. The engagement pieces 21a, 21 projecting from the clutch outer 21 as shown in FIG.
a is engaged with each side of the pentagonal projection 19a. A drive chain 22 is wound between the chain sprocket 11 and a small-diameter chain sprocket provided on the transmission case side (not shown).

On the other hand, the disc brake device 10 is of a so-called one-piston type, and bolts 23, 2 are provided below the bracket 13.
A single piston 25 is fitted on one side of the caliper 24 connected at 3 (see FIG. 2) so as to be slidable in the vehicle width direction (the left-right direction in FIG. 1). The piston 25 is a caliper
The pad 28 is moved inward (left and right in FIG. 1) under the pressure of the pressure oil supplied from a port 26 opened to the outer end surface of the outer end surface of the brake disk 24 and the pad 28 is attached to a brake disk 27 which rotates together with the hub 5 and the chain sprocket 14. By pressing the pad 28 and the pad 29 fixed in the caliper 24, the brake disc 27 is sandwiched from both sides to apply braking to the rotation of the rear wheel 3.
The bracket 13 has a stepped portion formed on the rear arm 1-1.
The rotation is prevented by engaging with the lower surface of the.

Incidentally, the brake disc 27 is formed in a ring shape, and the outer diameter thereof is set smaller than that of the chain sprocket 11. The inner peripheral portion of the brake disk 27 is guided in the vehicle width direction (the left-right direction in FIG. 1) by the guide pins 16 engaging with five anti-circular notched grooves 27a (see FIG. 2). It is slidably floating supported.

Here, a description will be given of a structure for connecting the rear axle 2 to the rear arms 1-1 and 1-2. The outer side of the rear ends of the rear arms 1-1 and 1-2 has a cross section V extending outward. U-shaped groove
28, 28 are formed long in the vehicle front-rear direction (left-right direction in FIG. 2), and rectangular recessed axle insertion holes 29, 29 are opened in the concave grooves 28, 28 in the vehicle front-rear direction. Also, rear arm 1
Chain pullers 30, 31 having a rectangular shape in side view are engaged with the concave grooves 28, 28 of -1, 1-2 so as to be movable in the vehicle longitudinal direction,
One end of the collar 12 is inserted and supported in a circular hole 30a (see FIG. 4) formed in one of the chain pullers 30 and the axle insertion hole 29 formed in the rear arm 1-1.
A concave groove 12a (fourth
Is formed over the entire circumference, and the collar 12 is prevented from coming off by engaging the leading end of a stopper bolt 32 screwed to the rear end face of the chain puller 30 with the concave groove 12a. . The position of the stopper bolt 32 is locked by a lock nut 33.

Thus, the rear wheel 2 is connected to the chain puller from the right in FIG.
31, the end piece 9, the collar 6, the end piece 8, and the collar 12 of the hub 5 are sequentially inserted into the end portion 2a (first portion).
The left end in the figure) contacts the nut 34 fixed and held in the chain puller 30. Thereafter, when the rear axle 2 is gripped with a tool and turned on the enlarged diameter portion 2b formed at the other end (the right end in FIG. 1) of the rear axle 2, the leading end 2a is screwed into the nut 34, and the rear axle 2 is screwed.
The chain pullers 30, 31, the collar 12, and the hub 5 are fastened in the axial direction without any gap, and both ends thereof are fixed to the rear arms 1-1, 1-2 with the rear wheel 3 rotatably supported.

In the motorcycle having the above-described rear wheel support structure, the rear wheel 3 can be easily removed in the following procedure. That is, when the rear axle 2 is turned in the above-mentioned manner to release the screw engagement with the nut 34 of the front end 2a, the rear axle 2 can be easily pulled out in the direction of the arrow in FIG. When the rear axle 2 is completely removed from the rear arms 1-1 and 1-2 as shown in FIG. 6, the rear wheel 3 has no support for it, but the disc brake device 10 and the chain sprocket 11
Is supported by the collar 12 and remains on one of the rear arms 1-1, and the disc brake device 10 is disposed outside, so that the rear wheel 3 can be prevented from interfering with the caliper 24 so that It can be easily removed by pulling it out in the direction of the arrow in the figure). FIG. 7 shows a state after the rear wheel 3 is removed.

Further, in this embodiment, since the single mechanical clutch 17 is used, the position of the hub 5 and the chain sprocket 11 can be easily adjusted when the rear wheel 3 is assembled.
Can be easily assembled in the reverse order to the above, and according to the rear wheel support structure, the rear wheel 3 can be easily attached and detached.

Thus, the rotational power from the engine (not shown) is input to the chain sprocket 11 via the drive tune 22 and the chain sprocket 11 is freely rotated on the collar 12. The rotation of the chain sprocket 11 is controlled by the mechanical clutch 17 , And at the same time, to the brake disc 27 through the guide pins 16.
The rear wheel 3 and the brake disk 27 are integrally driven to rotate.

Then, the disc brake device 10 is operated by the rider's brake operation, and the rotation of the rear wheel 3 is braked. That is, when pressure oil is supplied from the port 26 into the caliper 24, the piston 25 moves inward (to the right in FIG. 1),
To move the brake disc 27 in the same direction by the pad 28 and press it against the pad 29, the brake disc 27
The pad 27 is sandwiched between the pads 28 and 29 from both sides, and the rotation of the rear wheel 3 is braked by the low frictional force generated on the contact surface between the pads 28 and 29 and the brake disc 27.

As described above, in this embodiment, the single-piston disc brake device 10 is used, and the brake disc 27 side is slidably floated to cope with wear of the pads 28, 29. Therefore, it is not necessary to increase the width of the disk brake device 10, and the weight and structure of the disc brake device 10 can be reduced.

Further, in the present embodiment, since the disc brake device 10 is arranged outside the chain sprocket 11, the caliper 24 can be arranged offset to the outside, and even if the caliper 24 overlaps the chain sprocket 11 in a side view, Chain sprocket 11 with brake disc 27 diameter
Can be smaller than that of

(Effects of the Invention) As is apparent from the above description, according to the present invention, a disc brake device is provided between a rear wheel rotatably supported by a rear axle suspended on a pair of left and right rear arms and one rear arm. And the chain sprocket are arranged with the disc brake device on the outside, fitted on the outer periphery of the rear axle, one end of which supports the disc brake device and the chain sprocket by a collar fixed to the one rear arm. Since the hub of the wheel and the chain sprocket are connected by a mechanical clutch to form the rear wheel support structure of the motorcycle, an effect is obtained that the rear wheel can be easily attached and detached.

[Brief description of the drawings]

FIG. 1 is a longitudinal view (a cross-sectional view taken along line II of FIG. 2) of a rear portion of a rear arm of a motorcycle showing a rear wheel support structure according to the present invention;
FIG. 2 is a side view of the same, FIG. 3 is a sectional view taken along the line III-III of FIG.
FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 2, and FIGS.
The figure is a view similar to FIG. 1 showing how to remove the rear wheel. 1-1, 1-2 ... rear arm, 2 ... rear axle, 3 ... rear wheel, 5 ... hub, 10 ... disk brake device, 11 ...
Chain sprocket, 12 ... color, 17 ... mechanical clutch.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60B 27/00-27/04 B62K 25/02-25/04

Claims (1)

(57) [Claims] 1. A disk brake device and a chain sprocket are arranged between a rear wheel rotatably supported by a rear axle transversely mounted on a pair of left and right rear arms and one of the rear arms with the disk brake device on the outside. The one end of the rear axle is fitted to the outer periphery of the rear axle, and one end of the rear axle supports the disc brake device and the chain sprocket by a collar fixed to the one rear arm. Rear wheel support structure for motorcycles.