JPS5845126Y2 - Vibration isolation structure of link type rear suspension device - Google Patents

Description

[Detailed Description of the Invention] The present invention is a link type rear suspension device for a rear wheel drive automobile, for example, as shown in FIG. Upper control arm 11.1 whose upper end is connected to the vehicle body side
The present invention relates to an improvement of a link type rear suspension device comprising a control arm 1, a lower control arm 12, and a control arm 12, 12.

Conventionally, in Kono type rear suspension devices, the vibration forcing force from the differential gear (differential windup phenomenon) causes rotational vibration around the axle in the rear axle housing, and this rotational vibration mainly causes the control arm described above to This is transmitted to the vehicle body through the vibrations, which vibrates the body panels and the like, causing noise (so-called differential gear noise/muffled noise) to be generated in the vehicle interior.

In order to reduce such noise, a rubber bushing is interposed at the connection part of the control arm to the bracket fixed to the rear axle housing to reduce the vibration transmitted from the rear axle housing to the control arm. However, in this case, if the material of the rubber bushing is made soft in order to improve the vibration-proofing properties, it may cause problems such as hindering the steering stability of the vehicle, so it is not possible to take measures for noise prevention using only the rubber bushings mentioned above. There was a limit.

Therefore, this invention focused on the above-mentioned problems and in order to further reduce the noise caused by the vibrations transmitted by the control arms mentioned above, the mounting bracket of each control arm to the rear axle housing is attached to the rear axle housing via vibration isolating rubber. Here, we propose a vibration-proof structure that reduces noise without impeding the handling stability of the vehicle by fixing the vibration-proof rubber and the materials of the above-mentioned rubber bushings appropriately.

The present invention will be explained below with reference to the drawings. A first embodiment of the present invention is shown in FIGS. 1 and 2, and the reference numeral 10 in FIG. 1 indicates a rear axle housing housing a differential gear and a rear axle. ing.

On the left outer periphery of this rear axle housing 10 is a mounting bracket 2 for the left upper control arm 11.
0 connects to the rear axle housing 10 via the anti-vibration rubber 30
is fixed.

The mounting bracket 20 consists of a pair of upper and lower half-cylindrical members 21.22 having flanges 21a and 22a, and a pair of arm parts 23.23 fixed to the upper member 21. With the anti-vibration rubber 30 interposed, both flanges 21a and 22a are connected to bolts 24a1 and nuts 24.
It is fixed to the rear axle housing 10 by tightening at b.

The vibration isolating rubber 30 consists of a pair of semi-cylindrical bodies 31, 31, and a plurality of slits 32 extending in the axle direction are provided in the circumferential direction on the inner surface of each of these cylindrical bodies 31.

Each of these slits 32 has a spring constant of the vibration isolating rubber 30.
When there is no slit 32 (for example, the vibration isolating rubber 3
It is smaller than 0A).

In addition, between both arms 23 and 23 of the mounting bracket 200,
A cylindrical connecting member 11a fixed to the lower end of the upper control arm 11 is connected to both arm portions 2 through rubber bushings 14.
It is connected to a bolt 13 inserted and fixed at 3°23.

Note that the right upper control arm 11 and lower control arm 12°12 shown in FIG. 5 are also fixed to the rear axle housing 10 with the same structure as the left upper control arm 11 described above. .

In the anti-vibration structure configured as described above, even if the rear axle housing 10 rotates around the axle due to the force of vibration from the differential gear (Teff windup phenomenon), this rotational vibration is alleviated by the elasticity of the anti-vibration rubber 300. and is transmitted to the mounting bracket 20.

In this case, the vibration isolating rubber 30 has slits 32 to 32 in the axle direction.
32, vibrations of the rear axle housing 10 transmitted to the mounting bracket 20 are effectively alleviated.

Furthermore, the vibrations transmitted to the mounting bracket 20 via the vibration isolating rubber 30 are relaxed by the elasticity of the rubber bushing 140 and transmitted to the upper control arm 11.

This also applies to each lower control arm 12.

FIG. 3 shows a second embodiment of the present invention, in which a mounting bracket 20A for the upper control arm 11 is comprised of a cylindrical body 21A fitted into the rear axle housing 10 and a pair of mounting brackets fixed thereto. arm 23.2
The mounting platen 20A is fixed to the rear axle housing 10 with a cylindrical anti-vibration rubber 30A press-fitted between the cylindrical body 21A and the rear axle housing 10.

Further, FIG. 4 shows a third embodiment of the present invention,
Upper control arm 1 in this third embodiment
The mounting platen 20B of No. 1 consists of a pair of arm parts 23, 23 and an L-shaped mounting member 24 fixed to the lower part of the arms. Rear axle housing 1 via 30B
It is fixed to the rear axle housing 10 by connecting it with bolts, nuts, etc. to a bracket 15 fixed to the rear axle housing 10.

Note that the other configurations of the second and third embodiments are the same as those of the first embodiment described above, and the operation is also substantially the same as that of the first embodiment, so a description thereof will be omitted.

According to the above-mentioned vibration-proof structure, the mounting platen) 20.
2OA, 20B and the rear axle housing 10 and between the mounting bracket 20.2OA, 20B and each control arm 11, 12. Vibration isolating rubber 30.3OA, 30B and rubber bushing 14 are interposed between these vibration isolating rubbers 30.3.
By appropriately selecting the materials of the OA, 30B, and the rubber bushing 14, the vibrations transmitted to the control arms 11, 12 can be alleviated without impairing the steering stability of the vehicle. The interaction between 3OA, 30B and the rubber bush 14 can further reduce the noise generated in the vehicle interior.

[Brief explanation of the drawing]

Fig. 1 is a partial view showing the mounting structure according to the present invention, Fig. 2 is a vertical sectional view taken along the line ■-■ in Fig. 1, and Figs. 3 and 4 show other embodiments of the present invention. The longitudinal cross-sectional views and FIG. 5 are perspective views showing a conventional link type rear suspension device. Explanation of symbols, 10...Rear axle housing, 11...Upper control arm, 12
...°°. Lower control arm, 14...Rubber bushing, 20.2OA, 20B...Mounting bracket, 30.3OA, 30B...Vibration isolation comb.

Claims (1)

[Scope of utility model registration request] In a link-type rear suspension device comprising an upper control arm and a lower control arm that connect the rear axle housing to the vehicle body, the mounting brackets for each of the control arms to the rear axle housing are connected via vibration isolating rubber. A vibration-proof structure characterized in that the control arm is fixed to the rear axle housing, and the lower end of each of the control arms is connected to the mounting bracket via a rubber bush.