JPS61122088A - Rear suspension for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear suspension for a motorcycle, and more particularly to a rear suspension for a motorcycle in which a shock absorber is pivotally supported on a connecting shaft of a link mechanism.

(Prior Art) As is well known, in a motorcycle, a rear arm holding a rear wheel is pivotally supported on the vehicle body, the rear arm and the vehicle body are connected via a link mechanism, and a Some vehicles support the rear wheels on the vehicle body by interposing a shock absorber.

This type of rear suspension uses a rear arm and a link mechanism to transmit the load of the vehicle body to a shock absorber to soften the impact that the rear wheels receive from the road surface. By the way, the link mechanism consists of a forged body side link and a rear arm side link.

Both have a pair of wide arms at their ends, and one of the arms is provided via a bearing so that it can rotate around the connecting shaft, and a shock absorber is arranged axially on the connecting shaft. It is rotatably supported.

(Problems to be Solved by the Invention) As described above, in the conventional rear suspension, the link mechanism and the shock absorber are connected directly to each other in the axial direction on the connecting shaft. It is longer in the vehicle width direction and requires more installation space. Therefore, the exhaust pipe extending from below the internal combustion engine toward the rear wheels needs to be moved and placed, for example, to the side or below the vehicle body so as not to interfere with the connection shaft, which complicates the vehicle body design.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a structure in which a rear arm holding a rear wheel is pivotally supported on a vehicle body, and the rear arm and the vehicle body are connected by a vehicle body side link and a rear arm side link. In the rear suspension of a motorcycle, the rear wheel is connected to the vehicle body through a link mechanism, and an impact device is interposed between the link mechanism and the vehicle body to support the rear wheel on the vehicle body. The vehicle body side link and the rear arm side link are rotatably connected to both ends of a connecting shaft via a rotation shaft, and the lower end of the shock absorber is connected to the center of the rotation shaft. rotatably pivoted at the
It is characterized in that the connecting shaft is shortened in the axial direction.

(Function) In this invention, the rear arm that holds the rear wheel is pivotally supported on the vehicle body, and the vehicle body side link and the rear arm side link that constitute the link mechanism that connects this rear arm and the vehicle body are formed from sheet metal. The link and the rear arm side link are rotatably provided at both ends of the connection shaft via a rotation shaft. The lower end of the shock absorber is rotatably supported at the center of the rotating shaft, so that the length of the connecting shaft in the axial direction is shortened. Therefore, the installation space in the vehicle width direction for the connecting portion between the link mechanism and the shock absorber is reduced, and there is no need to take special consideration to the arrangement of exhaust pipes, etc., making the vehicle body design easier.

(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 figures are an enlarged cross-sectional view taken along the line ■--■ in FIG. 1, FIG. 3 is an enlarged side view of a main part, and FIG. 4 is an IT-IV cross-sectional view in FIG. 3.

In the figure, 1 is a car body frame, and this car body frame 1
Is it a head pipe? , upper and lower main frames 3 and 4, a down tube 5, a seat rail 6, and a back stay 7. A front fork 8 is rotatably provided on the head pipe 2, and a front wheel 9 is provided at the lower end of the front fork 8. The upper and lower main frames 3.4 are connected to the head pipe 2 and the backstay 7.
is welded to the center of the The down tube 5 is welded to the front side of the lower main frame 4, extends bent from below to the rear, and is welded to the back stay 7. A seat rail 6 is welded to the upper main frame 3,
The fuel tank 10 is mounted so as to be positioned in front of the upper main frame 3 and the seat rail 6.
A straddle-type seat 11 is attached to the rear of the vehicle 0 on the seat rail 6. The down tube 5 is provided with an internal combustion engine 12, and a pair of exhaust pipes 13 are connected to the front side of the internal combustion engine 12.
It is arranged to extend from below J12 to both sides of the rear wheel 14 through the lower side of the rear suspension 15 that supports the rear wheel 14.

The rear suspension 15 includes a rear arm 16. It is composed of a link mechanism 17 and a shock absorber 18. One end lea of the rear arm 16 is pivotally supported by a bracket 19 of the vehicle body frame 1 with a support shaft 20 as a fulcrum, and the other end lea
A rear wheel 14 is provided at b. The driving force from the internal combustion engine 12 drives the rear wheels 14 via a power transmission means such as a chain (not shown).

The rear arm 16 is supported by the vehicle body frame 1 by a link mechanism 17 and a shock absorber 18, and the load is transmitted to the shock absorber 18 via the rear arm 16 and the link mechanism 17.

Is the link mechanism 17 a link on the vehicle body side? (2) and a rear arm side link z2, both of which are connected via a rotation shaft portion 23. Is this vehicle body side link 21 a rotating shaft? The rear arm side link 22 is pivotally supported by a bracket 26 welded to the cross pipe 25 of the backstay 7 via the cross pipe 25 of the rear arm 16 via the rotation shaft 27.
It is pivotally supported by a bracket 29 of No.8. The buffer device 1
The lower end 18a of the 8 is supported by the link mechanism 17 via a rotation shaft 23, and the upper end 18b is supported by a bracket 30 provided on the heavy body frame 1 via a rotation shaft 31.

The rotation shaft portions 23, 24, 27 of the link mechanism 17 are
It is configured as shown in the figure. That is, the vehicle body side link 21 and the rear arm side link 22 are formed by punching a pair of sheet metals. One end 21a of the vehicle body side link 21
are applied to both sides of a support pipe 32 welded to the bracket 26 and rotatably supported by a support port 33.

The support port 33 is supported by the support pipe 32 via a collar 34 and a bearing 35, and is connected to the inner side 1 of the one end 21a and the support pipe 32. A thrust cover 37 having an oil seal 36 is interposed between the collar 34 and both sides of the bearing 35.

One end 22a of the rear arm side link 22 is extended on both sides of a support pipe 38 welded to the bracket 29, and is rotatably supported by a support port 39. The support port 39 is supported by the support pipe 38 via a collar 40 and a bearing 41, and is connected to the inside of the one end 22a and the support pipe 38. Color 40. A thrust cover 43 having an oil seal 42 is interposed between both sides of the bearing 41.

A collar 44 is interposed between the other ends 22b of the rear arm side link 22, and a support port 45, which is a connecting shaft, is inserted through the collar 44 and fixed by a nut 46. A rotation shaft 48 is rotatably provided on the collar 44 via a bearing 47, and the other end portions 21b of the vehicle body side link 21 are fitted on both sides of the rotation shaft 48, and are engaged with nuts 49, respectively. The other end 21b is tightened and fixed.
The rotating shaft 48 is integrally connected to the collar 4 via a bearing 47.
It can be rotated to 4.

The lower end 18a of the JR shock device 18 has an annular portion 18c.
is rotatably supported by the rotating shaft 48 via a bearing 50, and oil seals 51 are mounted on both sides of the bearing 50.

Next, the operation of this embodiment will be explained.

The load of the vehicle body applied to the rear arm 16 is transmitted to the shock absorber 18 via the balance mechanism 17, and the shock absorber 18 pushes the rotating shaft portion 23 of the link mechanism 17 downward, and at the same time generates a force that pushes the vehicle body frame l and the rear arm 16. This balance supports the load of the vehicle and dampens vibrations caused by uneven road surfaces.

By the way, the rotation shaft portion 23 of the vehicle body side link 21 and the rear arm side link 22 of the link mechanism 17 is connected to the support port 45 via a rotation shaft 48, and the annular portion 18c of the shock absorber 18 is connected to the rotation shaft 48. is rotatably provided via a bearing 50.

That is, a rotation shaft 48 and an annular portion 18C are coaxially provided on the support port 45 so as to be rotatable in the radial direction via bearings 47 and 50, respectively.

Therefore, the rotation shaft portion 23 of the link mechanism 17 is shortened, and the installation space in the vehicle width direction is easily secured, and the exhaust pipe 13
can be placed inside the vehicle body, simplifying the design of the vehicle body.

Further, the vehicle body side link 21 and the rear arm side link 22 that constitute the link mechanism 17 are formed by punching sheet metal, and there is no need to form a boss portion for providing a bearing, so the link mechanism 17 can be made smaller and lighter. .

(Effects of the Invention) As described above, the present invention includes molding the vehicle body side link and the rear arm side link that support the rear arm on the vehicle body from sheet metal,
Both ends of the connecting shaft are rotatably connected via a rotating shaft, and the Ia impact device provided on the vehicle body is rotatably supported at the center of this rotating shaft. The length is shortened. Therefore, with the link mechanism! The installation space in the vehicle width direction for the connection part with the shock absorber is shortened, there is no need to take special consideration to the arrangement of exhaust pipes, etc., and the design of the vehicle body becomes easier.

[Brief explanation of the drawing]

Figure 1 is a side view of a motorcycle to which this invention is applied;
The figures are an enlarged cross-sectional view taken along the line ■--■ in FIG. 1, FIG. 3 is an enlarged side view of a main part, and FIG. 4 is a cross-sectional view taken along the line IV-IT in FIG. 3. 1... Vehicle body frame 15... Rear suspension 16... Rear arm 17... Link mechanism 18
...Buffer device 20...Connection shaft 21...Vehicle side link 22...Rear arm side link 23.24, 27.31...Rotation shaft portion 48...Rotation shaft Fig. 2 Figure 3

Claims (1)

[Claims] A rear arm holding a rear wheel is pivotally supported on the vehicle body, this rear arm and the vehicle body are connected via a link mechanism consisting of a vehicle body side link and a rear arm side link, and a shock absorber is interposed between this link mechanism and the vehicle body. In the rear suspension of a motorcycle in which the rear wheel is supported on the vehicle body, the vehicle body side link and the rear arm side link are each constructed of a pair of sheet metal, and the vehicle body side link and the rear arm side link are attached to both ends of a connecting shaft. The shock absorber is rotatably connected via a rotation shaft, the lower end of the shock absorber is rotatably supported in the center of the rotation shaft, and the connection shaft is shortened in the axial direction. Motorcycle rear suspension.