JPH02128985A - Rear axle supporting device of motorcycle - Google Patents

Abstract

PURPOSE:To provide an improved appearance by forming a rear arm from a left and a right arm part with box-shaped profile, folding an upper and a lower face plate at the tail of each arm part in the directions approaching each other, and fitting a support for the rear axle slidably between their inside mating surface (guide faces). CONSTITUTION:A rear arm 1 whose foremost is supported on a rear arm bracket at the rear part of car body with possibility of swinging, is composed of a left and a right pivot pipe 20, arm parts 21 extending backward from these pipes 20, and a coupling member 25 which couples the two arm parts 21, wherein the rear wheel 7 is supported by the rear axle 6 at the tail part with possibility of rotating. Each arm part 21 is made in box-shaped profile by jointing an inner and an outer plate 23, 22 both having a channel-shaped profile. Partially on the rear wheel 7 side, an upper and a lower face plate 23a, 23b at the tail of the inner plate 23 are folded in the directions of approaching each other, wherein the upper and lower mating surfaces of these folded parts 37 are shall serve as guide faces 39, and a support 32 for rear axle 6 is fitted between these guide faces 39.

Description

[Detailed description of the invention] (Industrial application field) The second invention relates to a rear axle support device for a motorcycle.

(Prior Art) Among the above-mentioned devices, there is one disclosed in, for example, Japanese Utility Model Application Publication No. 59-19494. According to this, the rear arm is pivotally supported at the rear of the vehicle body frame so as to be vertically swingable, and the rear arm includes a pair of left and right arm portions. Each of the arm sections has a box-shaped cross section, and the upper and lower opposing surfaces at the rear ends of the arm sections are guide surfaces extending parallel to each other in the forward travel direction, and a support for supporting the rear axle is provided between these guide surfaces. The body is fitted so that it can slide forward and backward. By moving the rear axle back and forth by sliding the support, the tension of the transmission chain that transmits power from the engine to the rear axle can be adjusted.

In addition, in the above configuration, each arm part is made of sheet metal, giving the rear arm a light and light appearance! In some cases, each arm portion is tapered toward the rear end in a side view in order to allow the arm portion to tighten.

Incidentally, even when the rear arm is formed as described above, upper and lower guide surfaces extending parallel to each other in the front-rear direction are necessary in order to guide the support member so as to be slidable back and forth as described above. Conventionally, in an attempt to obtain this guide surface, an end piece with the above-mentioned guide surface formed thereon was separately provided at the rear end of the rear arm, or a part of the rear end of the rear arm was bent to form each of the above-mentioned guide surfaces. .

(Problems to be Solved by the Invention) However, if the end piece is provided separately as described above, the number of parts for this rear arm will increase, making the configuration complicated and undesirable. If a part of the rear arm is simply bent, this will easily be visible and the appearance of the rear arm will deteriorate.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and is designed to support the rear axle when the left and right arm portions of the rear arm are tapered toward the rear end. To provide a simple structure for each guide surface that guides a support body for sliding forward and backward movement, and to prevent the appearance of a rear arm from deteriorating even when each guide surface is provided. .

(Structure of the Invention) A feature of the present invention for achieving the above object is that each portion of the upper rear end of each arm portion and a portion of the lower plate on the rear wheel side are bent in a direction toward each other, and these bent portions are bent toward each other. The upper and lower opposing surfaces are guide surfaces extending parallel to each other in the front-rear direction, and a support for supporting the rear axle is fitted between these guide surfaces so as to be slidable back and forth.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a motorcycle, and a rear arm 4 is pivotally supported at the rear of a body frame 2 by a pivot shaft 3 so as to be vertically swingable. A rear axle 6 is supported at the swinging end of the rear arm 4, and a rear wheel 7 is rotatably supported on the rear axle 6. Furthermore, a shock absorber 9 is installed between the rear part of the vehicle body frame 2 and the front-rear midway part of the rear arm 4 via a link mechanism 8, and this shock absorber 9 is passed through the rear arm 4 from the rear wheel 7 to the vehicle body frame while driving. It buffers the impact that is transmitted to the second side.

Reference numeral 11 denotes an engine, which is supported by the vehicle body frame 2, and includes a driving chain wheel 12 provided on the engine 11 and a driven chain wheel 13 attached to the rear wheel 7.
A transmission chain 14 is wound around the rear wheels 7, and power is transmitted from the engine 11 to the rear wheels 7 through these. 16 is a seat, and 18 is a fuel tank.

2 to 5, the rear arm 4 has a pair of left and right aluminum pivot vibes 20, 20 that are rotatably fitted onto the pivot shaft 3. Then, from each Vivot vibrator 20 toward the rear, the arm portion 2 is
1 extends, and these left and right arm portions 21.21 are positioned so as to sandwich the rear wheel 7. Each arm portion 21 is made of aluminum sheet metal and has a box-shaped cross section, and includes an outer plate 22 with a U-shaped cross section, and an inner plate with a U-shaped cross section located closer to the rear wheel 7 than the outer plate 22. 23 from the left and right sides and welded together. Also,
The front and rear intermediate portions of each of the arm portions 21 are connected to each other by a connecting member 25 made of sheet metal. A bracket 26 for connecting the link mechanism 8 is welded to the lower part of the connecting member 25.

In the above case, in order to provide sufficient strength to the front and rear midway portions of the rear arm 4 supporting the shock absorber 9, the vertical dimensions of each arm portion 21 are made large in this portion. Further, for reasons such as appearance, each arm portion 21 is formed in a tapered shape toward the front and rear ends, respectively, when viewed from the side.

According to FIG. 1 and FIGS. 5 to 7, each arm portion 2
1 and the portion where the rear ends of these arm portions 21 support the rear axle 6 will be explained in detail.

The outer plate 22 of each arm portion 21 is formed by bending a single plate to have a U-shaped cross section as described above, and this is formed by the upper plate 22 facing away from each other vertically.
a and a lower plate 22b, and these upper and lower plates 22
It has a side plate 22c that connects the edges of a and 22b on the side far from the rear wheel 7 to each other. On the other hand, like the outer plate 22, the inner plate 23 has an upper plate 23a, a lower plate 23b, and a side plate 23c, but the side plate 23c is the edge of the upper and lower plates 23a, 23b on the side closer to the rear wheel 7. are connected to each other.

Then, the inner plate 23 is fitted into the outer plate 22, and the upper plates 22a and 23a, the lower plate 22b,
23b are joined and welded to each other, so that each arm portion 21 has a box-shaped cross section as described above.

Left and right side plates 22c, 2 at the rear end of each arm portion 21
A long hole 27 extending in the front-back direction is formed in each of the holes 3c. Each end of the bolt-shaped rear axle 6 is inserted into the elongated hole 27° 27 so as to be able to move back and forth along the elongated hole 27, and a nut 28 is screwed into the threaded portion thereof. . Further, the rear wheel 7 is rotatably supported by the rear axle 6 via a bearing 29, and a collar 30 is fitted onto the rear axle 6.

A support body 32 that passes through the rear axle 6 and supports the rear axle 6 is fitted inside each of the arm portions 21 . Adjustment bolts 33 are provided on the rear surface of each support 32.
The rear end of the adjustment bolt 33 passes through an end plate 34 detachably attached to the rear end of each arm portion 21, and an adjustment nut 35. is provided at the rear end.
35 is screwed on.

By operating the adjustment nuts 35 and 35 by screwing, the support body 32 can be moved back and forth. When this operation is performed, the driven chain wheel 13 moves together with the rear axle 6 along with the support body 32, and this As a result, the desired tensile state of the transmission chain 14 is obtained. And in this state Natsu 28
When screwed in, the outer plate 22 and the inner plate 23 at the rear end of each arm portion 21 sandwich the support body 32 from the left and right sides, and the support body 32 is fastened at that position.

In FIGS. 1, 6, and 7, portions of the upper surface plate 23a and lower surface plate 23b at the rear end of each inner plate 23 on the rear wheel 7 side are bent in a direction toward each other. The vertically opposing surfaces of the bent portions 37 and 37 serve as guide surfaces 39 and 39 that extend parallel to the elongated hole 27 in the front-rear direction.

The support body 32 is placed between these guide surfaces 39 and 39.
is fitted so as to be slidable back and forth, that is, the support body 32 is guided in a desired direction forward and backward by both guide surfaces 39 and 39 without rattling up and down. In the above case, the support body 32 has a pair of protrusions 38.3 on its upper and lower surfaces, respectively.
8, and the protruding pieces of each protruding piece 38 come into sliding contact with the corresponding guide surface 39. In other words, the weight of each support body 32 is reduced.

Although the above is based on the illustrated example, the arm portion 21 is formed by bending a single plate material, and the arm portion 21 is formed by bending a single plate material.
The above-mentioned bent portions 37 may be formed in each of the upper and lower portions of the rear end plate on the rear wheel T side.

(Effects of the Invention) According to the present invention, the guide surface that guides the support body for supporting the rear axle so as to be slidable back and forth is formed by bending a part of each arm portion, so that it is possible to Since no separate parts such as pieces are required, this guide surface can be obtained with a simple construction.

Furthermore, this guide surface is formed by bending the upper and lower rear end portions of each arm on the rear wheel side in the direction toward each other, so that each arm can be bent from the outside, which is the side opposite to the rear wheel. When viewed, even if the guide surface is formed as described above, changes in the appearance of this arm portion are suppressed. Therefore, even if each guide surface is provided as described above, deterioration in the appearance of the rear arm is suppressed, and in other words, the appearance of the rear arm is maintained in good condition.

(Margin below)

[Brief explanation of drawings]

The figures show an embodiment of the invention, and FIG. 1 is I-I in FIG. 6.
Figure 2 is a rear side view of the motorcycle, Figure 3 is a sectional view taken along the line.
The figure is a side view of the rear arm, Figure 4 is a plan view of the same rear arm, Figure 5 is a sectional view taken along the line V-V in Figure 3, and Figure 6 is a sectional view taken along the line ■-■ in Figure 2. , Figure 7 shows ■−■ in Figure 6.
It is a sectional view taken along the line. ! ...Motorcycle, 2.Body frame, 4.Rear arm, 6.Rear axle, 7.Rear wheel, 2-toe part, 22
a...Top plate, 22b...Bottom plate, 22c...Side plate, 2
3a...Top plate, 23b...Bottom plate, 23c...Side plate,
32...Support body, 37...Bending portion, 39...Guiding surface.

Claims (1)

[Claims] 1. A rear arm is pivotally supported at the rear of the vehicle body frame so as to be able to swing up and down, and this rear arm has a pair of left and right arm sections that sandwich the rear section from the left and right sides, and each arm section is made of sheet metal and has a box-shaped cross section. A rear axle support device for a motorcycle, wherein a support for supporting a rear axle is fitted into the rear end of each arm so as to be movable back and forth, and each arm has a tapered shape in a side view toward the rear end. , the upper and lower rear end portions of each arm portion on the rear wheel side are bent in a direction toward each other, and the vertically opposing surfaces of these bent portions are used as guide surfaces extending parallel to each other in the front-rear direction. , a rear axle support device for a motorcycle, in which a support body is fitted between these guide surfaces so as to be slidable back and forth.