JPS6240234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a so-called link mount type engine suspension system that pivotally connects an engine to a vehicle body via a link, and particularly relates to an anti-vibration system that effectively absorbs engine vibrations. The present invention relates to an engine suspension system.

BACKGROUND ART Rubber mount systems, link mount systems, and the like have been conventionally used in motorcycles and the like to suspend engines on the vehicle body side.

The link mount method described above connects the engine to the vehicle body through a plurality of links arranged substantially parallel to each other, and is configured so that the engine can be displaced in the direction of vibration. The aim is to prevent the spread of

However, in this type of link mounting system, since rubber bushings are interposed at the engine-side and vehicle-side connecting portions of each link, the rigidity in the left-right direction of the vehicle body, that is, the lateral rigidity, tends to be low.
For this reason, the engine is displaced in directions other than the excitation direction, and there are many restrictions on effectively blocking the propagation of engine vibrations to the vehicle body.

In view of the above-mentioned problems in this type of engine suspension system, the present inventor has devised the present invention to effectively solve the problem.The purpose of the present invention is to By providing a pair of ball bearings spaced a predetermined distance apart in the axial direction on each of the connecting shaft and the vehicle body side connecting shaft, and by fixing a rubber bush parallel to the ball bearings between both the connecting shafts and the link, lateral rigidity can be improved. To provide a vibration-isolating engine suspension device which can suppress engine displacement in directions other than the vibration excitation direction by increasing the vibration, and can effectively block the propagation of engine vibrations toward a vehicle body.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view of the rear part of a motorcycle equipped with a suspension system according to the present invention, and FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG.

In the motorcycle 1 shown in FIG. 1, an engine unit 5, which is formed by compactly integrating an engine 3 and a transmission case 4, is located at the lower center of the vehicle body 2.
are suspended on the vehicle body 2 via links 6 and 7 that are spaced apart from each other in the front and back and are provided substantially parallel to each other.

The engine 3 is arranged approximately horizontally, and a piston (not shown) fitted inside the cylinder of the engine 3 slides approximately horizontally, so that the engine unit 5 is vibrated approximately horizontally.

By the way, the links 6 and 7 are installed substantially perpendicular to the vibration direction of the engine unit 5,
The upper end of the link 6 is rotatably connected to brackets 8a, 8a protruding from the lower part of the main frame 8 of the vehicle body 2, and the lower end is rotatably connected to a bracket 3a protruding from the front upper part of the engine unit 5. The upper end of the other link 7 is the seat post part 2a of the vehicle body 2.
In addition, the lower end portions are pivotally connected to a bracket 9 connected to the rear end of the engine unit 5, respectively.

For example, the upper connecting portion of the link 6 having the vehicle body side connecting shaft A is constructed as shown in FIG.
That is, the upper end of the link 6 has a hole 6a in the thickness direction.
6a, and ring-shaped collars 11, 11, each of which has a ring-shaped rubber bushing 10 fixed therein by baking or the like, are press-fitted into these holes 6a, 6a. Bearings 12, 12 are press-fitted into the outer ends of the holes 6a, 6a, as shown in the figure.

Therefore, the brackets 8a, 8 at the upper end of the link 6
As shown in FIG.
the bolt 13 is aligned with the holes 8b, 8b drilled in the bearing 1, and then the bolt 13 is inserted into the hole 8b
2, collar 11, 11, bearing 12, hole 8b
This is accomplished by commonly inserting and tightening the nut 14, which is screwed onto one end of the bolt 13.

The lower end connecting portion of the link 6 having the engine side connecting shaft B is also constructed in exactly the same manner as described above, as shown in FIG. 2, and the other link 7 is also constructed in exactly the same manner as the link 6.

On the other hand, rear suspensions 16, 16 are interposed on the left and right between a rear fender part 2b integrally formed behind the seat post part 2a of the vehicle body 2 and a rear wheel 15 rotatably supported below the rear fender part 2b. Further, rear forks 17, 17 are pivotally connected to the left and right between the rear wheel 15 and the bracket 9 so as to be swingable. In addition, 18 in Figure 1 is a sheet, 1
9 and 19 are foot steps.

Therefore, the connecting portion of links 6 and 7, for example link 6
In the upper end connecting portion A, both ends of the collars 11, 11 through which the bolts 13 are inserted are fixed by highly rigid bearings 12, 12, so the lateral rigidity of the engine suspension system is high, and therefore the engine unit 5 can be displaced only in the excitation direction; displacement in other directions is restricted. As a result, the propagation of engine vibration toward the vehicle body is effectively blocked, and minute vibrations are effectively absorbed and alleviated by the vibration absorption effect of the rubber bushes 10, 10.

Next, a third application example of the suspension system according to the present invention will be described.
As shown in the figure.

In this embodiment, the engine 103 and the transmission case 10
Power unit 1 that compactly integrates 4 components
05 is pivotally connected to the vehicle body frame 102 via a link 106 which has the same structure as the links 6 and 7. In this case as well, the lateral rigidity of the suspension system can be increased for the same reason as above, and as a result, the power It is possible to suppress unnecessary displacement of the unit 105 and effectively block the propagation of engine vibrations to the vehicle body.

In the above embodiment, the bearing and the rubber bushing were arranged side by side in the thickness direction of both connecting parts of the link, but a considerable effect can also be achieved by providing the above structure for at least one of these connecting parts. Ru.

As is clear from the above description, according to the present invention, in an engine suspension system that pivotally connects the engine to the vehicle body through links substantially orthogonal to the excitation direction of the engine, the engine side is connected in the thickness direction of each link. A pair of ball bearings are provided at a predetermined distance in the axial direction on each of the shaft and the vehicle body side connecting shaft, and a rubber bush parallel to the ball bearings is fixed between both of the connecting shafts and the link. Bearings and rubber bushings are arranged in parallel in the thickness direction of at least one of the engine-side and vehicle-side connections of the link, increasing the lateral rigidity of the suspension system and suppressing engine displacement in directions other than the vibration direction. This makes it possible to effectively block the propagation of engine vibration to the vehicle body, and furthermore, it is possible to position the link by regulating the rotation of the link around the connecting shaft, eliminating the need for a link stopper or eliminating the need for a link stopper. It can be made smaller (simplified).

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the rear part of a motorcycle equipped with a suspension system according to the present invention, FIG. 2 is an enlarged sectional view taken along the line 2-2 in FIG. 1, and FIG.
The figure is a diagram similar to FIG. 1 according to a modified embodiment. In addition, 5,105 in the drawing is a power unit, 6,
7,106 is a link, 10 is a rubber bush, 1
1 is a collar, 12 is a bearing, 16 is a rear action, and 17 is a rear fork.

Claims (1)

[Claims] 1. In an engine suspension system that pivotally connects the engine to the vehicle body through links that are substantially perpendicular to the engine vibration direction, a A vibration-isolating engine suspension system, characterized in that a pair of ball bearings are provided separated by a predetermined distance, and a rubber bushing arranged parallel to the ball bearings is fixed between the two connecting shafts and the link.