JPH0249057Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a support structure for a differential carrier of a vehicle.

[Prior art]

A typical example of a support structure for a differential carrier (hereinafter referred to as a differential carrier) is shown in FIG.
The figure shows a support structure for a differential carrier in an independent rear suspension. A differential carrier 2 extending in the longitudinal direction of the vehicle has its front and rear ends fixed to a suspension member 3 and a differential support member 4, respectively. Each of the members 3 and 4 is arranged in the vehicle width direction, and a cylindrical mount 1 is provided at both ends thereof.

The cylindrical mount 1 has a vibration-proof rubber body 13 inserted between an outer cylinder 11 and an inner cylinder 12 arranged concentrically, and is arranged with the axial direction facing up and down. 4, and the inner cylinder 12
A mounting bolt is inserted into the inside from below and fixed to the vehicle frame F.

[Problem that the invention attempts to solve]

By the way, the vibration generated in the differential carrier 2 is
It consists of small high-frequency vibrations and large-amplitude vibrations such as vertical bouncing vibrations when driving on rough roads and pitching vibrations during sudden acceleration and deceleration. Pitting vibration is vibration of the differential carrier 2 around the axle shaft 21 protruding from the left and right sides thereof. When this pitting vibration occurs, a vertical force acts on the cylindrical mount 1 located at the front and rear of the differential carrier 2.

Here, in the conventional support structure described above, since the cylindrical mount 1 is disposed in the vertical direction where the vibration force acts, the direction in which the force acts coincides with the direction in which the bolts come off, which may cause the differential carrier to fall.
Therefore, in order to prevent the differential carrier from falling off, the spring constant of the vibration isolating rubber body 13 needs to be relatively large, and the absorption of minute vibrations is not sufficiently achieved, resulting in insufficient reduction of the noise inside the vehicle interior.

Therefore, Japanese Utility Model Application No. 52-126527 proposes a support structure in which the axis of the cylindrical mount 1 is directed toward the vehicle longitudinal direction. However, in this structure, when pitching vibration is input, the inside and outside of the cylindrical mount 1 are Cylinder 1
1 and 12, the durability of the mount 1 becomes a problem.

The present invention is an attempt to solve this problem, and aims to provide a support structure for a differential carrier that can satisfactorily absorb minute high-frequency vibrations and has sufficient durability against large-amplitude vibrations. purpose.

[Means for solving problems]

The structure of the present invention will be explained with reference to FIG. 1. A differential carrier 2 is supported on a vehicle frame F by a cylindrical mount 1. The mount 1 has a vibration isolating rubber body 13 inserted between the inner cylinder 12 and the outer cylinder 11, and the axis of the mount 1 is in the axial direction of the axle shaft 21 which projects from the differential carrier 2. It is arranged to match.

[action, effect]

In the above support structure, since the cylindrical mount 1 is provided horizontally, even if the spring constant of the vibration isolating rubber body 13 is made small, there is no fear of it falling off due to bounding vibration or pitching vibration. Therefore, high frequency vibrations of the differential carrier 2 are well absorbed by the vibration isolating rubber body 13 having a sufficiently small spring constant.

The cylindrical mount 1 has its axis aligned with an axle shaft 21 that protrudes from the differential carrier 2.
Since the inner cylinder 12 and the outer cylinder 11 are arranged so as to coincide with the axial direction of the inner cylinder 12, the inner cylinder 12 and the outer cylinder 11 will not be distorted when pitching vibration is input, and therefore, there will be no decrease in durability.

〔Example〕

In FIG. 1, the differential carrier 2 is disposed in the longitudinal direction of the vehicle, and axle shafts 21 protrude from both sides thereof in the vehicle width direction. A suspension member 3 and a differential support member 4 are arranged in the vehicle width direction at the front and rear of the differential carrier 2, respectively, and the front end of the differential carrier 2 is fitted into the central chevron-shaped portion of the suspension member 3. It is fixed. The rear end upper surface of the differential carrier 2 is fixed to the differential support member 4.

Both members 3 and 4 are provided with cylindrical mounts 1 on both sides, and the mounts 1 are positioned horizontally with their axes oriented in the vehicle width direction. The mount 1 has an outer cylinder 11 and an inner cylinder 12 arranged concentrically, and a vibration-proof rubber body 13 is provided between them. The outer cylinder 11 is connected to the side walls of each member 3, 4, and the inner cylinder 12 has a bracket R installed opposite to the vehicle frame F so as to sandwich both ends of the inner cylinder 12.
A mounting bolt (not shown) passing through is inserted and fixed to the frame F by tightening a nut.

According to this structure, since the cylindrical mount 1 is arranged horizontally, even if the spring constant of the vibration isolating rubber body 13 is made small, there is no risk of it falling off due to bouncing vibrations or pitching vibrations. High frequency vibrations of the differential carrier 2 are well absorbed by the vibration isolating rubber body 13 having a small spring constant. This effect is shown in FIG.

The figure shows the sound pressure level in the vehicle interior, where the line x in the figure is based on the support structure of the present invention, and the line y is based on the conventional structure. As can be seen from the figure, the sound inside the vehicle is effectively reduced.

Since the axis of the cylindrical mount 1 is oriented in the vehicle width direction, even when pitching vibration centered on the axle shaft 21 is input, the inner and outer cylinders 11 and
12 does not get twisted, and therefore exhibits sufficient durability.

The support structure of the present invention can also be applied to a differential carrier support independent of the suspension arm, as shown in FIG. In the figure, F1 is a front cross member, and a U-shaped bracket R is provided on the member F1. The differential carrier 2 is provided with an L-shaped bracket 22 at its front end, and a cylindrical mount 1 is joined to the tip of the bracket 22 with its axis oriented in the vehicle width direction. The mount 1 is fixed to the bracket 23 by a bolt inserted through the mount 1. The rear end of the differential carrier 2 is placed on a differential support member 4' on a flat plate by means of a cylindrical mount 1 whose axis is oriented in the vehicle width direction.

This structure also provides the same effects as the above embodiment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a support structure showing one embodiment of the present invention, FIG. 2 is a diagram showing the noise reduction effect, FIG. 3 is a perspective view of a support structure showing another embodiment of the present invention, and FIG. The figure is a perspective view of a conventional support structure. 1... Cylindrical mount, 11... Outer tube, 12...
Inner cylinder, 13... Anti-vibration rubber body, 2... Differential carrier, 21... Axle shaft, 3
...Suspension member, 4,4'...Differential support member, F...Vehicle frame, R...Bracket.

Claims (1)

[Scope of utility model registration request] In a differential carrier support structure in which a differential carrier of a vehicle is supported on a vehicle frame by a cylindrical mount in which a vibration-proof rubber body is inserted between an inner cylinder and an outer cylinder, the above-mentioned cylindrical mount is used. A support structure for a differential carrier, characterized in that the axial center thereof is arranged to coincide with the axial direction of an axle shaft that projects horizontally from the differential carrier.