JPH0285086A - Rear axle supporting device for motorcycle - Google Patents

Abstract

PURPOSE:To increase the rigidity strength of a link bracket by insertion- supporting a pivot into the right and left rear arm brackets in which a cross member is horizontally laid and axially supporting a link supporting shaft onto a pair of link brackets which are fixed onto the pivot shaft and the cross member. CONSTITUTION:The right and left sheet pillars 5 in pairs are installed at the rear edge part of the main frame of a car body frame, and each rear arm bracket 8 is welded onto the sheet pillars 5. Each cross member 19 is integrally welded at the lower edge parts of the right and left rear arm brackets 8 in pairs, and a pivot shaft 23 is fastened and fixed onto the rear arm bracket 8 by a nut 24, part 25a of a rear arm 25 is axially supported in turnable ways onto the pivot shaft 23. The pivot shaft 23 is inserted into the right and left link brackets 26, which are welded onto the cross member 19, keeping a prescribed interval. Then, the car body side link 30 of a link mechanism 29 is axially supported in turnable ways onto the link bracket 26 by a bolt 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rear wheel support device for a motorcycle, and more particularly, to a rear wheel support device for a motorcycle that improves the strength of a vehicle body side support portion that supports the rear wheel.

[Prior Art] In a motorcycle, a rear arm holding a rear wheel is pivotally supported on a vehicle body frame, and this rear arm and the vehicle body frame are connected via a link mechanism. Some vehicles support the rear wheels in a swingable manner on the vehicle body with a shock absorber interposed therebetween.

This type of rear wheel support device is known, for example, from Utility Model Application No. 59-194
As disclosed in Publication No. 91, the rear arm is supported by a pivot shaft on a bracket welded to the vehicle body frame.
Further, the link mechanism is pivotally supported by a bracket disposed below the pivot shaft of the vehicle body frame.

[Problems to be Solved by the Invention] As described above, the pivot shaft of the rear arm and the support shaft of the link mechanism are supported by brackets that are separately welded to the vehicle body frame, and are supported in a cantilevered manner. For this reason, especially in motorcycles used for trial competitions, for example, when jumping and landing or passing an obstacle, the
Also, a strong force is applied from the shock absorber side via the link mechanism. Therefore, on the vehicle body frame side, it is necessary to create a structure that provides particular strength to the parts of the rear arm that support the pot shaft and the link mechanism of the shock absorber.

In addition, especially in motorcycles used for trial competitions, there is a risk that the link mechanism that supports the shock absorber may come into contact with obstacles, so the link mechanism must be configured to avoid contact with obstacles as much as possible. There is.

This invention has been made in view of the above circumstances, and provides a rear wheel support device for a motorcycle that improves the rigidity of the support portion of the rear arm and shock absorber, and also prevents the link mechanism of the shock absorber from interfering with obstacles. It is characterized by providing

[Means for Solving Problem J] In order to solve the above problem, the present invention pivots a rear arm holding a rear wheel to a vehicle body frame via a pot shaft, and connects the rear arm and the vehicle body frame with a link mechanism. In a rear wheel support device for a motorcycle that supports the rear wheel by interposing a shock absorber between the link mechanism and the vehicle body frame, a cross link is provided between a pair of rear arm brackets provided on the vehicle body frame. The member is mounted horizontally, a pivot shaft is inserted and supported through the rear arm bracket, a pair of link brackets are fixed across the pivot shaft and the cross member, and the link support shaft of the link mechanism is connected to the cross member and the pivot shaft. It is characterized by being pivotally supported on a link bracket at a position between.

Further, in the present invention, the movable range of the connecting shaft that connects the vehicle body side link of the link mechanism and the rear arm side link can be set within the side width of the rear arm.

[Operation] In this invention, the load from the rear arm side is received by the rear arm bracket via the pivot shaft, and the load from the N shock device is received by the link bracket via the link mechanism.

The pivot shaft and link mechanism are each supported at both ends, and the pivot shaft is inserted through the link bracket on which the link mechanism is supported, so the link bracket, which is subject to large loads, has improved rigidity and strength. Since this link bracket acts as a rib of the cross member, the support strength on the vehicle body side is improved.

In addition, the connecting shaft that connects the vehicle body side link and the rear arm side link of the link mechanism, due to the swinging of the rear arm,
Since it does not protrude vertically from the side width of the rear arm, interference with obstacles is prevented.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

Figure 1 is a side view of a motorcycle to which this invention is applied;
The figure is a side view of the rear wheel support device of a motorcycle, Figure 3 is an enlarged side view of the main parts, Figure 4 is a cross-sectional view taken along IV-IV in Figure 3, and Figure 5 is a cross-sectional view taken along line V-V in Figure 3. Figure 6 is the V of Figure 3.
It is a T-Vl sectional view.

This motorcycle is used for trial competitions, and the body frame 1 includes a main frame 2, a head vibe 3, a down tube 4, a seat flap 5, a seat rail 6, a backstay 7'EL, and a rear arm bracket 8.
These are slim and light. This main frame 2 forms a fuel tank, and an engine 9 is mounted in the center of the vehicle body frame 1. This engine 9 is set at a high minimum height so as not to come into contact with obstacles, and a carburetor 10 is connected to the rear of the engine 9, and an air cleaner 11 is further connected to this carburetor 10. The air cleaner 11 is disposed below the seat rail 6, and the seat rail 6 is provided with a decorative seat 12.

An exhaust pipe 13 is connected to the front side of the engine 9, and this exhaust pipe 13 extends toward the rear of the vehicle body along the lower part of the main frame 2. A muffler 14a is connected to this exhaust pipe 13, and further to this muffler 14a. A silencer 14b is connected. The muffler 14a is located below the seat 12, and the silencer 14b is located above the rear wheel 15.

A front fork 16 is supported on the head vibe 3 connected to the front side of the main frame 2, and a handle 17 is provided at the upper end of the front fork 16, and a front wheel 18, which is a steering wheel, is provided at the lower end. ing.

A pair of left and right seat pillars 5 are located at the rear end of the main frame 2.
A rear arm bracket 8 is welded to each seat villa 5, and this rear arm bracket 8
is formed by cutting out aluminum material. A cross member 19 is welded and integrated to the lower ends of the pair of left and right rear arm brackets 8.
At 9, an engine protector 20 extending from the down tube 4 side is fastened and fixed with bolts 21.

Additionally, a mounting portion 8a is provided at the upper end of the rear arm bracket 8.
A backstay 7 is provided through the backstay 7, this backstay 7 is welded to the seat rail 6, and the backstay 7
A cross member 22 is welded between them to integrate the left and right back stays 7.

As shown in FIG. 4, a pivot shaft 23 is fastened to the rear arm bracket 8 with a nut 24, and an end 25a of a rear arm 25 is rotatably supported on this pivot shaft 23. A rear wheel IS is provided at the end.

The pivot shaft 23 is inserted through a pair of left and right link brackets 26, and the link brackets 26 are welded to the cross member 19 at a predetermined interval, so that the rear arm bracket 8 and the link bracket 26 are integrated at the pivot shaft 23. Therefore, the rigidity of the link bracket 26, which receives a large load, is improved, and since the link bracket 26 acts as a rib for the cross member 19, the support strength on the vehicle body side is improved.

Between the link brackets 26 is a mounting part 9a for the engine 9.
is supported by a pivot shaft 23, and a mounting stay 27 for the engine 9 is welded to the cross member 19, and a mounting portion 9a of the engine 9 is supported by the mounting stay 27 via a bolt 28.

A vehicle body side link 30 of a link mechanism 29 is rotatably supported on the link bracket 26 by a bolt 31 which is a link support shaft, and a mounting bracket 33' of a UI impact device 32 is rotatably supported on this vehicle body side link 30 as a connecting shaft. The shock absorber 132 is rotatably connected via a certain bolt 34 and supported by the rear end of the main frame 2 .

A rear arm side link 37 is pivotally supported on both sides of the vehicle body side link 30 via bolts 36, and this rear arm side link 3f is connected to a support portion 38a of a cross member 38 welded to the rear arm 25 via bolts 39, respectively. It is rotatably supported on the shaft.

This cross member 38 reinforces the rear arm 25, and a recess 38b is formed in the center thereof to avoid interference with the vehicle body side link 30, and a reinforcing plate 40 is welded to this portion.

A protector 41 is provided to cover the lower portions of the cross member 38 and rear arm 25, and this protector 41 prevents obstacles from interfering with the cross member 38 and rear arm 25.

The movable range α of the axis A of the bolt 36 that connects the vehicle body side link 30 of the link mechanism 29 and the rear arm side link 37 is set within the side width of the rear arm 25, and the lower end and upper end of the rear arm 25 are It is designed to move within the width of the rear arm 25 when viewed from the side so that it does not protrude further.

Further, the shock absorber 32 is configured not to extend below the rear arm 25, and as a result, the &IW1 device 32 does not fit between the rear arms 25, so the pivot shaft 23
The cross member 38 of the rear arm 25 can be brought close to the rear arm 25. Therefore, the cross member 38 of the rear arm 25
is arranged close to the pivot shaft 23, the rear wheel 1
5 can be brought closer together, making it possible to shorten the wheelbase.

[Effects of the Invention] As described above, the present invention horizontally suspends a cross member between a pair of rear arm brackets provided on a vehicle body frame, further supports a pivot shaft through the rear arm bracket, and connects the pivot shaft and the cross member. A pair of link brackets are fixed across the bridge, and the link support shaft of the link mechanism is pivotally supported on the link brackets at a position between the cross member and the pivot shaft, so the link brackets that receive large loads have high rigidity and strength. Furthermore, since this link bracket acts as a rib of the cross member, the support strength on the vehicle body side is improved.

Additionally, if the movable range of the connecting shaft that connects the vehicle side link of the link mechanism and the rear arm side arm is set within the side width of the rear arm, the rocking of the rear arm will cause it to protrude vertically from the side width of the rear arm. This prevents interference with obstacles while driving. Furthermore, since a shock absorber is not inserted between the rear arms, the cross member of the rear arm can be brought close to the pivot shaft, and its diameter wheel can be moved forward, making it possible to shorten the wheel base.

[Brief explanation of drawings]

Figure 1 is a side view of a motorcycle to which this invention can be applied;
The figure is a side view of the rear wheel support device of a motorcycle, Figure 3 is an enlarged side view of the main parts, Figure 4 is a +v-rv sectional view of Figure 's3, and Figure 5 is a V-V cross-section of Figure 3. Figure 6 is the v of Figure 3.
It is an i-vi sectional view. In the figure, 1 is the vehicle frame, 8 is the rear arm bracket, 19 is the cross member, 25 is the rear arm, 26 is the link bracket, 29 is the link mechanism, 30 is the vehicle side link, 32 is the shock absorber, 36 is the bolt, 37 is the rear arm The side link 38 is a cross member.

Claims (1)

[Claims] 1. A rear arm holding a rear wheel is pivotally supported on the vehicle body frame via a pivot shaft, the rear arm and the vehicle body frame are connected via a link mechanism, and the link mechanism and the vehicle body frame are connected together. In a rear wheel support device for a motorcycle that supports a rear wheel with a shock absorber interposed therebetween, a cross member is horizontally suspended between a pair of rear arm brackets provided on the vehicle body frame, and a pivot shaft is further mounted on the rear arm bracket. A pair of link brackets are fixed across the pivot shaft and the cross member, and the link support shaft of the link mechanism is pivotally supported by the link bracket at a position between the cross member and the pivot shaft. Features: Rear wheel support device for motorcycles. 2. The rear wheel support device for a motorcycle according to claim 1, wherein a movable range of a connecting shaft connecting the vehicle body side link and the rear arm side link of the link mechanism is set within a side width of the rear arm.