JPH0195920A - Suspension device for vehicle - Google Patents

Abstract

PURPOSE:To promote the reduction of noise transmitted and the improvement of assembly workability by supporting all the links and coil springs, serving as the suspension member, collectively to a subframe while mounting it to a car body through an elastic member. CONSTITUTION:Housing an axle shaft, connected to right and left rear wheels 1R, 1L serving as the driving wheel, in an axle casing 2, its both right and left end parts are supported to a car body through upper links 6L, 6R and lower links 12L, 12R respectively. In this structure, a car body side connecting end of each link 6L, 6R, 12L, 12R is respectively connected to a subframe 20. The subframe 20 is mounted to the car body through elastic members 24. While the subframe 20 supports upper ends of coil springs 29 for suppressing each rear wheel 1L, 1R from its vertical vibration. That is, the subframe 20 is elastically supported to the car body while collectively supporting the suspension members.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a suspension device for a vehicle, and particularly to one in which wheels serving as drive wheels are suspended on a vehicle body.

(Prior Art) Conventionally, an axle casing that houses an axle shaft connected to a wheel has been used as a suspension device for a vehicle such as an FR (front engine/rear drive) type vehicle.
Extending in the longitudinal direction of the vehicle body and disposed at both left and right ends of the axle casing (portions close to the left and right wheels),
A pair of left and right upper links and lower links whose front ends are connected to the vehicle body and whose rear ends are connected to the axle casing via elastic bushings, and an axle casing upper surface or a rear end of the lower link are connected to the left and right ends of the axle casing, respectively. The so-called rigid axle type, which is equipped with a pair of left and right coil springs that are arranged between the vehicle body and suppress vertical vibration of the wheels, is known (see Automotive Engineering Complete Book No. 11, which was submitted as a written application in this application). (see volume).

(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional rigid axle type suspension device, as a noise countermeasure, the upper and lower link The elastic bushes provided at both ends of the coil spring prevent noise generated by the coil spring from being transmitted to the vehicle body by a spring seat made of an elastic body interposed between the upper end of the coil spring and the vehicle body. However, the current situation is that this noise countermeasure is not sufficient, and it is one of the major causes of vehicle body vibration.

Furthermore, the suspension device is assembled to the vehicle body by connecting each component (upper link, lower link, and coil spring) to the vehicle body separately.
There was a problem in that the assembly work was time-consuming. still,
In the case of an independent suspension system in which the left and right wheels are each independently suspended on the vehicle body, all suspension members are assembled on one subframe to improve the ease of assembling the suspension system to the vehicle body. Although the subframe may be configured to be attached to the vehicle body, it is difficult to directly apply this configuration to the rigid axle type suspension 812, which is a completely different type from the independent suspension type.

The present invention has been made in view of the above, and its purpose is to provide the above-mentioned rigid axle type suspension device with a configuration that uses a subframe in consideration of its configuration, thereby reducing the transmission of noise to the vehicle body. In addition to reducing the amount of heat generated, it is also possible to improve ease of assembly.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is such that the axle casing housing the axle shaft connected to the wheel is connected to the left and right ends of the axle casing through an upper link and a lower link, respectively. A suspension system for a vehicle supported by a vehicle body has the following configuration.

That is, the connecting ends of the upper link and the lower link on the vehicle body side are each connected and supported by a subframe, and the subframe is attached to the vehicle body via an elastic body. Further, the upper end of the coil spring for suppressing vertical vibration of the wheel is supported by the subframe.

(Function) With the above configuration, in the present invention, the noise generated in the wheel or the axle casing or the noise generated by the coil spring is simply absorbed by the elastic bushings at both ends of the upper and lower links or the elastic body at the upper end of the coil spring, as in the conventional case. Not only are they reduced individually, but they are further reduced overall by the elastic body interposed between the subframe and the car body, which collectively support the links and the upper ends of the coil springs, so that they are transmitted to the car body. Noise reduction is greatly improved.

Also, suspension lii! To assemble the device to the vehicle body, connect the upper link, lower link, and coil spring, which are the suspension members, to the subframe, and assemble the axle casing to the subframe (subassembly). This can be easily done by attaching it to the vehicle body, improving the ease of assembly.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 and 2 show suspension all of a vehicle according to an embodiment of the present invention, 1L and 1R are left and right rear wheels, 2 is an axle casing extending in the vehicle width direction, and the axle casing 2 is , a differential storage part 2a that stores a differential gear, and a shaft storage part 2b that stores the axle shaft 3 and is connected to the left and right sides of the differential storage part 2a.
, 2b. The rear end of a propeller shaft 5 extending in the longitudinal direction of the vehicle body is connected to the input shaft 4 of the differential, and the engine output transmitted via the propeller shaft 5 is transmitted to the left and right axle shafts by the differential.
．． 3, and the left and right rear wheels IL and IR connected to the axle shaft 3.3 are driven.

Further, 6L and 6R are upper links extending in the longitudinal direction of the vehicle body at both left and right ends of the axle casing 2 (rear wheel 1L or 1R side portion of the shaft storage portion 2b), and each of the upper links The rear ends of 6L and 6R are the shaft storage portions 2b of the axle casing 2, respectively.
It is rotatably connected via an elastic bush 8 and a support shaft 9 to a mounting bracket 7 attached to the
The front end is rotatably connected to the vehicle body side (more specifically, a horizontal member 22 of a subframe 20, which will be described later) via an elastic bushing 10 and a support shaft 11. 12L and 12R are O-rings provided at both left and right ends of the axle casing 2, respectively, extending below the upper links 6L and 6R in the longitudinal direction of the vehicle body.
The rear ends of R are rotatably connected to mounting brackets 13 attached to the shaft storage portions 2b of the axle casing 2 via elastic bushings 14 and support shafts 15, and the front ends are connected to the vehicle body side (for details It is rotatably connected to a vertical member 21) of a subframe 20, which will be described later, via an elastic bushing 16 and a support shaft 17. In the case of the embodiment, instead of using the conventional lateral link, the left and right upper links 6L and 6R are rigidly connected by a connecting rod 18 extending in the vehicle width direction, and the whole is configured as an H-shaped link 19. Rear wheel 1 by H type link 19
It supports the lateral load acting on L and IR.

Furthermore, 20 is a nap frame, and the sub-frame 20 includes a pair of left and right vertical members 21 .
21, and a cylindrical horizontal member 22 extending in the vehicle width direction and connecting the 1sti members 21 and 21 to each other. Each of the vertical members 21 has triangular side walls 21b, 21b hanging from the left and right edges of the upper surface 21a, and the upper surface 21a of the vertical member 21 is located in front of the main frame 23, which is a strength member of the vehicle body. Elastic body 24.2 at 1M 2 locations
It is supported through 4. Each of the elastic bodies 24 has a third
As shown in detail in the figure, bolts 25 are attached to the main frame 23.
and ± the inner cylinder 24a fixed by the seat 26, and inside the nucleus! It is arranged on the outer periphery of t124a, and the upper surface part 2 of the vertical member 21
It consists of an outer tube 824b that is fixed through the inner tube 1a, and a rubber 24c that is filled and fixed between the inner tube 24a and the outer tube 24b. Each vertical member 21 of the sub-frame 20 has the 0 link 12L between the left and right side wall portions 21b and 2ib.
Alternatively, the lower link 12L or 12R is supported by installing a support shaft 17 for connecting the front end of the lower link 12R. On the other hand, mounting brackets 27 and 27 are attached to the horizontal member 22 of the sub-frame 20 at positions close to the left and right vertical members 21 and 21, respectively, and the upper link 6 is attached to the base mounting bracket 27.
A support shaft 11 for connecting the front end of L or 6R is supported, so the front end of the upper link 6L or 6R is connected to the subframe 2.
It is supported by the horizontal member 22 of 0.

In addition, a spring receiver is attached to the rear end portion (axle casing side) of each of the lower links 12L and 12R.
8 is installed, and the spring receiver is attached to the rear wheel IL on the member 28.
, Coil spring 2 for suppressing vertical vibration of IR
9 is placed.

The upper end of the coil spring 29 is connected to the subframe 2
A spring receiver formed on the rear end side of the upper surface portion 2Ia of the vertical member 21 is supported by a portion 21c. Note that the upper end of the coil spring 29 and the spring receiver of the vertical member 21 are located at the portion 21.
C, and between the lower end of the coil spring 29 and the spring receiver member 28, in the case of the upper end of the coil spring 29, as shown in FIG. Intervention is provided.

Further, 31 is a spare tire attached to the vehicle body behind the axle casing 2.

Next, to explain the functions and effects of the above embodiment,
Noise generated in the rear wheels IL and IR and the differential device in the axle casing 2 is transferred from the axle casing 2 to the main frame 2 on the vehicle body side via the upper link 6m, 6R' or O link 12m, 12R and the subframe 20.
3.

The transmission of this noise to the vehicle body is simply by using the upper link 6L.
6R or lower links 12L, 12R, the upper surface part 21 of the vertical member 21, which is the vehicle body attachment part of the subframe 20, which not only reduces the reduction by the elastic bushes 8, 10 or 14', 16 at both ends, but also collectively supports them. An elastic body 24 (rubber 2
40), the reduction can be greatly increased. Further, the noise generated due to the expansion and contraction movement of the coil spring 29 is also suppressed by the upper end of the coil spring 29 and the vertical member 20 of the subframe 20.
The spring receiver is located between the spring seat 3 and the part 21c.
It is further reduced together with 0 by the elastic body 24, and its reduction is achieved.

In addition, when assembling the suspension device to the vehicle body,
The vehicle body side connecting ends (front ends) of the upper links 6L, 6R and lower links 12L, 12R, which are suspension members, and the upper end of the coil spring 29 are all connected to the subframe 20.
Since the structure is such that the suspension members are connected to the subframe 20 in advance and the axle casing 2 is sub-attached, the suspension is assembled by simply attaching only the subframe 20 to the main frame 23 of the vehicle body. The device can be easily assembled to the vehicle body, and the ease of assembly can be improved.

Moreover, in the case of the embodiment, the subframe 20 is structurally simple and has high rigidity, in which the left and right vertical members 21 and 21 are connected by the horizontal member 22, and the vertical member 2
1 has a substantially U-shaped cross section, and the horizontal member 22 has a cylindrical shape, and both members 21 and 22 are designed to reduce their weight and increase their strength as much as possible. Therefore, the subframe 20 can sufficiently withstand the suspension load without deformation, and the subframe 20 hardly causes an increase in the vehicle weight.

It should be noted that the present invention is not limited to the above embodiments, but includes various other modifications.

For example, in the above embodiment, the left and right upper links 6L, 6
R are connected by a connecting rod 18 to form an H-shaped link 19, while the wheels (rear wheel 1m long) are connected by a connecting rod 18.

Although the case has been described in which the lateral link for supporting the lateral load acting on the IR is omitted, the present invention can be similarly applied to the case where the above-mentioned lateral link is used. In this case, one end of the lateral link is connected to the axle casing 2.
The other end may be connected to the subframe 20.

Further, in the above embodiment, the present invention is applied to the coil spring 2.
Although this is applied to the case where the lower end of 9 is supported on the rear end of the lower link 12L or 12R, it can be similarly applied to the case where the lower end of the lower link 9 is supported on the upper surface of the axle casing 2, etc. , the subframe 20 is attached to the vehicle body via the elastic body 24, and the subframe 20 is attached to the vehicle body via the elastic body 24.
What is necessary is to adopt a structure in which the vehicle body side connecting portion of the suspension member is supported.

(Effect of the invention) As described above, the vehicle suspension [j
According to f, in a jet axle type in which the axle casing is supported on the vehicle body via links, the links and coil springs, which are suspension members, are all collectively supported by a subframe, and the subframe is supported by an elastic body. By attaching it to the vehicle body through the vehicle, transmission of noise from the wheels, differential gear, etc. to the vehicle body can be significantly reduced, and ease of assembly can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway plan view, FIG. 2 is a side view, and FIG. 3 is a cross-sectional view showing the structure of the intermediate mounting portion of the subframe. 2...Axle casing, 6L, 6R...Upper link, 12L, 12°R...Lower ring, 20...
・Subframe, 23... Main frame (vehicle body),
2 Patent applicant Mazda Motor Corporation 1,1゜ε
・

Claims (1)

[Claims] (1) In a suspension system for a vehicle in which an axle casing housing an axle shaft connected to a wheel is supported by the vehicle body at both left and right ends of the axle casing via an upper link and a lower link, respectively, the upper link and the lower link are located on the vehicle body side. The connecting ends are each connected and supported by a subframe, and the subframe is attached to the vehicle body via an elastic body, and the upper end of a coil spring for suppressing vertical vibration of the wheel is supported by the subframe. A vehicle suspension device featuring: