JP2003040177A - Suspension system for motorcycle - Google Patents

Abstract

(57) [Summary] [Object] To provide a suspension device structure capable of shortening a wheel base in a motorcycle having a backbone type frame. A main frame and a center frame constituting a backbone type frame are provided, and an operation seat is supported on an upper portion of the center frame so as to be vertically swingable. The front end of the rear swing arm 15 is mounted on the lower portion of the center frame portion 8. Thereby, the mounting portions of the rear swing arm 15 and the rear cushion unit 22 are arranged vertically on the right side surface of the center frame portion 8, and the rear cushion unit 22 is offset to the right side from the center frame portion 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-wheel suspension system, and more particularly to an advantageous arrangement structure of its rear shock unit. In the present application, the front-rear, left-right, and up-down directions with respect to the vehicle body are based on when the vehicle body travels straight and in the forward direction.

[0002]

2. Description of the Related Art A backbone type frame is one of the vehicle body frame types in motorcycles, and includes a main frame portion composed of a single pipe member or the like arranged in the front-rear direction above the engine along the center of the vehicle body. , A center frame portion composed of one or a plurality of members arranged vertically behind the engine, and the main frame portion and the center frame portion are integrated, and a rear wheel suspension device is provided at a lower portion of the center frame portion. The rear swing arm constituting the above is structured to pivotally support the front end portion thereof. As an example, in Japanese Patent No. 2719940, a rear cushion unit is arranged in the center of the vehicle body, an upper portion thereof is connected to a rear end of one main frame portion, and a pair of center frame portions is provided on the left and right sides of the rear cushion unit. Things are shown. Further, in this type of motorcycle, a rear cushion unit that constitutes a rear wheel suspension device is arranged on the center of the front vehicle body of the rear wheel, and the rear end portion of the main frame portion or the upper end portion of the center frame portion is arranged. A structure may be adopted in which the vicinity (hereinafter, this part is referred to as a back upper part of the backbone type frame) and a rear swing arm are connected.

[0003]

By the way, when the rear shock unit is arranged as in the above-mentioned conventional example, the rear cushion unit is located between the center frame portion and the rear wheel, so that the rear wheel is displaced rearward. Since the wheel base tends to be long, there are cases where a rear shock unit layout structure that can shorten the wheel base is desired. In the above-mentioned Japanese Patent No. 2719940, a pair of center frame parts must be provided on the left and right of the rear cushion unit in order to shorten the wheel base. Further, when a vertically swinging type driving seat is provided in the upper rear portion of the backbone type frame, it is also desirable that the driving seat and the rear cushion unit are arranged so as not to interfere with each other. Therefore, the present invention aims to realize such a request.

[0004]

In order to solve the above-mentioned problems, a suspension system for a motorcycle according to the present invention is provided with a swing arm for supporting rear wheels, which is swingably provided near a rear lower end of a backbone frame. In a suspension system for a motorcycle in which a rear shock unit is arranged between the rear swing arm and an upper part of a backbone type frame, the rear part of the backbone type frame is arranged vertically in the center of the vehicle body, and the rear shock unit is provided. The support part is placed on the rear side surface of the backbone type frame in the left-right direction above the support part of the rear swing arm.

At this time, the driver seat is attached to the upper rear portion of the backbone frame via a seat cushion so as to be vertically swingable, and the seat cushion attachment portion of the operator seat and the support portion of the rear shock unit are left and right. It can be configured to be arranged side by side in the direction. Further, the seat cushion attachment portion can support the operation seat so as to be swingable with respect to the frame and be integrally removable.

[0006]

According to the present invention, in the frame structure adopting the backbone type frame provided in the center of the vehicle body, the support portion of the rear shock unit is provided on the rear side surface of the backbone type frame above the support portion of the rear swing arm. Since they are arranged side by side in the left-right direction, the rear shock unit will be arranged offset in the lateral direction of the vehicle body. Therefore, even if the rear shock unit is brought closer to the rear wheels, it will not interfere with the rear wheels, the wheel base can be shortened, and a compact vehicle body can be obtained.

Further, even if the driver's seat is attached to the upper rear portion of the backbone type frame via the seat cushion so as to be vertically swingable, the seat cushion attachment portion of the operator's seat and the support portion of the rear shock unit are laterally moved. By arranging them side by side, it is possible to prevent interference between the rear shock unit and the vicinity of the cushion mounting portion of the vertically swinging operation seat. In addition, the seat cushion mounting portion allows the driver's seat to be swingably supported with respect to the backbone type frame and can be integrally removed.

DETAILED DESCRIPTION OF THE INVENTION

An embodiment will be described below with reference to the drawings. 1 to 5 relate to an embodiment, FIG. 1 is a right side view of the whole, FIG. 2 is a perspective view of the whole shown from diagonally right rear, FIG. 3 is a bottom view of the whole, and FIG. FIG. 5 is an enlarged view showing diagonally from the rear, FIG. 5 is an enlarged view showing the upper mounting structure of the rear cushion unit from the diagonally right rear, and FIG. 6 is an enlarged view showing the opposite side of FIG.

In these figures, 1 is a front wheel, 2 is a pair of left and right front forks, 3 is a bottom bridge, 4 is a top bridge, 5 is a handle, and 6 is a head pipe. The head pipe 6 is integrated with the front end of a main frame portion 7 arranged in the front-rear direction along the center of the vehicle body.
The main frame portion 7 is made of a metal round pipe or the like, is arranged obliquely downward to the rear from the head pipe 6, and the rear side forms a center frame portion 8 that bends and extends downward, thereby forming a backbone frame. ing. The main frame portion 7 and the center frame portion 8 can be formed continuously or integrally, or separate members can be integrated.

A fuel tank 10 is provided on the main frame portion 7.
The horizontal engine 11 is arranged long in the front-rear direction in the space below and in the front space of the center frame portion 8. The engine 11 is supported by a pair of left and right engine hanger mount stays 12 that extend obliquely downward from the center frame portion 8 and the head pipe 6 below the main frame portion 7 and extend rearward.

An operation seat 13 is supported on the upper portion of the center frame portion 8 through a seat cushion 14 so as to be swingable in the vertical direction, and a tip end of a rear swing arm 15 is attached to a lower end portion of the center frame portion 8 by a mounting shaft 16. It is swingably supported by.

A pair of left and right rear swing arms 15 are provided, and a rear wheel 17 is supported between respective rear ends of the rear swing arms 15. The upper part of the rear wheel 17 is covered with a rear fender 18, and the stay 1
A movable fender that can swing together with the rear swing arm 15 is formed by 9, 20, etc., and a tail lamp 21 is arranged at the rear portion thereof. The tail lamp 21 swings up and down together with the rear fender 18, which is a movable fender.

An intake system component including a carburetor 24 and an air cleaner 25 is arranged above the engine 11, and the air cleaner 25 is located in a space surrounded by the fuel tank 10, the center frame portion 8 and the engine hanger mount stay 12. However, the carburetor 24 is located at a position overlapping the engine hanger mount stay 12 in a side view, and is connected to the intake port of the cylinder head 26 forming the engine 11.

The rear cushion unit 22 that constitutes a suspension device together with the rear swing arm 15 is located in the upper portion of the center frame portion 8 in the vicinity of the mounting portion of the driver's seat 13 and in the side view of the right rear swing arm 15 at the front end of the rear wheel 17. It is obliquely disposed between the stay 23 and the stay 23 provided at a substantially overlapping position.

The engine hanger mount stay 12 is made of an appropriate member such as a metal round bar or a pipe, and its rear end is connected to an upper portion of a crankcase 27 constituting the engine 11. The rear portion of the crankcase 27 is supported by the center frame portion 8, and steps 28 are provided on the lower left and right sides of the crankcase 27 so as to project laterally, and the brake pedal 3 is provided near the step 28 on the right side.
0 is provided.

An exhaust pipe 31 extends from an exhaust port of the cylinder head 26 and extends to the rear right side of the lower portion of the engine 11 substantially horizontally and is connected to a muffler 32 supported on the bottom of the crankcase 27. The muffler 32 is arranged long in the front-rear direction from below the crankshaft of the engine 11 to the vicinity of the rear wheel 17, and a tail pipe 33 extends rearward from the rear end thereof. A rear end portion of the tail pipe 33 forms a large diameter portion 34, and between the front portion and a portion above the muffler 32 on the rear half side of the exhaust pipe 31, each side surface is made of a substantially horizontal straight metal plate. It is covered with a muffler cover 35.

As is apparent from FIGS. 2 and 4, the mounting portion of the driving seat 13 is attached to the seat stays 36 provided on the left and right of the upper portion of the center frame portion 8, and one end of a link 37 constituting a seat cushion mounting portion is attached to a bolt 38. The shaft is fixed by means of this, and its tip is fastened with a nut 39 for detachable attachment.

One end of the seat cushion 14 formed of a coil spring is attached to the rear portion of the link 37, and the other end is attached to the stay 41 projecting downward at the center of the rear portion of the seat frame 40 by a pin 42. Pin 42
An adjusting rod 43 axially arranged inside the seat cushion 14 slidably penetrates through the seat cushion 14, and an adjusting nut 44 is fastened to the tip of the adjusting rod 43. A hinge 40a provided at the front end of the seat frame 40 and a front end of the link 37 are swingably connected by a shaft 45.

Therefore, the driving seat 13 swings up and down about the shaft 45 due to the vibration of the vehicle body, and at this time, the seat cushion 14 can be expanded and contracted to absorb the shock load.
Further, by removing the bolt 38 and the nut 39, the driving seat 13 can be integrally removed from the vehicle body frame. An escape recess 10a is formed in the rear portion of the fuel tank 10 to avoid interference when the operating seat 13 is swung (FIG. 2).

As is apparent from FIG. 6, the seat stay 36
A cushion mounting portion 46, which is a welding bolt, is provided in the vicinity of the right side surface of the center frame portion 8 so as to project to the right side of the vehicle body. The cushion mounting portion 46 is passed through the upper bearing boss 47 of the rear cushion unit 22 and fastened with the nut 48. The upper bearing boss 47 of the rear shock unit 22 is supported on the upper side surface of the center frame portion 8.

This supporting portion is arranged side by side in the left-right direction with the mounting portion of the link 37 for the seat stay 36, and, as is apparent from FIG. 2, above the supporting portion of the mounting shaft 16 of the rear swing arm 15 at the center. The right side surface of the frame portion 8 is arranged so as to overlap from the right side of the vehicle body. As a result, the rear cushion unit 22 is offset to the right of the center of the vehicle body connecting the centers of the center frame portion 8 and the rear wheel 17.

The seat stay 36 and the rear cushion unit 22 may be attached at positions above the rear upper portion of the backbone type frame, that is, from the rear portion of the main frame 7 to the upper portion of the center frame portion 8. Also, FIG.
As is clear from the above, the center frame portion 8 is arranged along the center of the vehicle body as a single pipe member that is continuous with the main frame portion 7, but the shape and structure of the square pipe, the pressed product, etc. are arbitrary.

2 and 3, the rear end 31a of the exhaust pipe 31 connected to the muffler 32 below the rear swing arm 15 and the front end 33a of the tail pipe 33 are curved. There is. Therefore,
The rear half of the exhaust pipe 31 excluding the rear end 31a and the front end 33
The front halves of the tail pipe 33 except a are linearly arranged on the same line, and are covered by the muffler cover 35. When the muffler cover 35 is made of resin, the exhaust pipe 3 is provided with a metallic luster plating or the like so that the exhaust pipe 3 looks
1 appears to be connected to the large-diameter portion 34 in a straight line, giving a sense of unity to the appearance of the exhaust system.

As is apparent from FIG. 3, the muffler 32 has a relatively large capacity in the shape of a substantially rectangular box elongated in the front-rear direction, and has a relief recess 49 formed on its right side surface.
It does not interfere with the rotation of the brake pedal 30.

Next, the operation of this embodiment will be described. As described above, the backbone type frame is constituted by one main frame portion 7 and the center frame portion 8 which continuously extend from the head pipe 6 to the lower portion of the vehicle body near the supporting portion of the rear swing arm 15 along the vehicle body center. On the right side surface of the center frame portion 8, the rear shock unit 2
The cushion mounting portion 46, which is the mounting portion of the upper bearing boss 47, and the support portion of the mounting shaft 16, which is the supporting portion of the rear swing arm 15, are provided side by side, so that the center frame portion 8 positioned on the center of the vehicle body 8 The rear shock unit 22 is offset from the rear wheel 17 in the lateral direction of the vehicle body, that is, to the right in this embodiment. Therefore, even if the rear shock unit 22 is brought closer to the rear wheel 17 side, it does not interfere with the rear wheel 17, the wheel base can be shortened, and a compact vehicle body can be obtained.

Further, even if the driving seat 13 is attached to the upper rear portion of the backbone type frame via the seat cushion 14 so as to be vertically swingable, a seat stay for supporting the link 37 which is the seat cushion mounting portion of the driving seat 13. 36 and the support portion of the rear shock unit 22 are arranged side by side in the lateral (horizontal) direction so that the rear shock unit 22 and the vicinity of the cushion mounting portion of the operation seat 13 that swings up and down. Will not interfere.

In addition, the link 37, which is the seat cushion mounting portion, and the seat stay 36 are detachably coupled to each other, so that the driving seat 13 can be swingably supported with respect to the backbone frame and can be integrally removed.

FIG. 7 is a view corresponding to FIG. 1 relating to another embodiment. In this example, a tandem seat 50 is provided, and a long seat cushion 51 is provided between the rear bottom portion and the seat stay 36.
It is supported by 6 and is vertically swingable and detachable. The rear end seat of the tandem seat 50 is located above the rear wheel 17, and the rear end thereof extends rearward from the center of the rear wheel 17. Instead of the seat cushion 51, the driving seat 50 may be fixedly supported by a pipe member or the like.

Further, tandem steps 52 are provided on the left and right sides of the middle portion of the rear swing arm 15 so as to be able to move up and down.
Passengers can put their feet on it. Since the other structures are the same as those of the previous embodiment, common parts are designated by common reference numerals and description thereof is omitted.

[Brief description of drawings]

FIG. 1 is a right side view of an entire motorcycle according to an embodiment.

FIG. 2 is a diagonally right rear perspective view of the entire motorcycle according to the embodiment.

FIG. 3 is a bottom view of the entire motorcycle according to the embodiment.

FIG. 4 is a diagram showing a driving seat mounting portion from a diagonally left rear side.

FIG. 5 is a view showing the opposite side of FIG.

FIG. 6 is a right side view of the entire motorcycle according to another embodiment.

[Explanation of symbols]

1: front wheel, 7: main frame part, 8: center frame part, 11: engine, 12: engine hanger mount stay, 13: operating seat 14: seat cushion, 15: rear swing arm, 16: mounting shaft, 17:
Rear wheel, 22: rear cushion unit, 30: brake pedal, 31: exhaust pipe, 32: muffler, 33: tail pipe, 35: muffler cover, 36: seat stay

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[Procedure amendment]

[Submission date] October 23, 2001 (2001.10.
23)

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Claims (3)

[Claims] 1. A motorcycle in which a swing arm for supporting rear wheels is swingably provided near a lower end of a rear portion of a backbone type frame, and a rear shock unit is disposed between the rear swing arm and an upper portion of the backbone type frame. In the suspension device, the rear portion of the backbone type frame is vertically arranged in the center of the vehicle body in the vertical direction, and the supporting portion of the rear shock unit is provided on the rear side surface of the backbone type frame above the supporting portion of the rear swing arm. A suspension device for a motorcycle, which is characterized in that the suspension devices are arranged so as to overlap each other. 2. A driving seat is vertically swingably mounted on a rear upper portion of the backbone frame via a seat cushion, and a seat cushion mounting portion of the driving seat and a support portion of the rear shock unit are laterally arranged. The suspension device for the motorcycle according to claim 1, wherein the suspension device is arranged side by side. 3. The motorcycle according to claim 2, wherein the seat cushion mounting portion supports the driving seat so as to be swingable with respect to the frame and is detachable integrally therewith. Suspension system.