JPH06137145A - Supporting device for exhaust system member - Google Patents

Abstract

PURPOSE:To absorb vibration of each displacement level, such as small, intermediate, and large displacement. CONSTITUTION:In a supporting device for elastically supporting an exhaust system member to a car body through an elastic member, the elastic member consists of a first rubber member 2 made of soft rubber having a penetrating hole in which the bracket 6 on the car body side is inserted rubber member 3 made of hard rubber having a penetrating hole in which the bracket 6 on the exhaust system member side is inserted, and a plate spring member 4 for mutually connecting the first and second rubber member 2, 3. The first rubber member 2 is provided with spring characteristic suitable for any small displacement, the second rubber member 3 is provided with spring characteristic suitable for any intermediate displacement, and the plate spring member 4 is provided with spring characteristic suitable for any large displacement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for elastically supporting an exhaust system member such as an exhaust pipe, a catalytic converter and a silencer (muffler) on a vehicle body.

[0002]

2. Description of the Related Art Generally, in an automobile, an engine exhaust system member is provided in a transmission case in an engine room and in a vehicle body behind the engine room.
Each is elastically supported from the standpoint of anti-vibration.

The general structure of the supporting device for supporting the exhaust system member on the vehicle body is that the upper end is fixed to the vehicle body through a through hole into which a support portion is inserted, and the lower end is fixed to the exhaust system member. The elastic member is provided with a through hole into which the support portion is inserted and a through hole provided above and below, and the vibration of the exhaust system member due to vehicle body vibration is absorbed by the rubber member.

By the way, the vibration of the vehicle body includes a small displacement vibration called NVH and a medium displacement vibration such as when traveling on a rough road. The spring constant of the elastic rubber member in the conventional supporting device is set so as to adapt to the appropriate vehicle body displacement level between the small displacement and the medium displacement, and the vibration of the displacement level over a wide range can be absorbed. It wasn't something.

Therefore, as disclosed in, for example, Japanese Utility Model Laid-Open No. 3-69337, a support device for an exhaust system member in which a plurality of slits are provided in an elastic rubber member to absorb vibration at a displacement level over a wide range. Is proposed.

[0006]

However, when the elastic rubber member is provided with the slit as described above, the rubber member is deteriorated due to the influence of heat from the exhaust system member, and a crack is generated from the position of the slit. There was a drawback.

Further, in such a structure, there is a problem that the rubber member is cut off when a large displacement level impact is applied as in the case of a collision.

In view of the above-mentioned circumstances, the present invention is capable of absorbing the vibrations of the small displacement level and the medium displacement level and preventing the damage of the rubber member even when the impact of the large displacement level is applied to the vehicle body. An object is to provide a support device for an exhaust system member.

[0009]

In an exhaust system member supporting apparatus according to the present invention, the elastic member has three-stage spring characteristics adapted to small displacement, medium displacement and large displacement, respectively. The spring characteristic adapted to the large displacement level is set so as to adapt to a state in which an excessive impact is applied to the vehicle body.

Specifically, the elastic member includes a first rubber member having a through hole into which a support member on the vehicle body side is inserted,
A second rubber member having a through hole into which a support member on the exhaust system member side is inserted, and a leaf spring member connecting the first and second rubber members are included. Of the first and second rubber members, One of them has a spring characteristic adapted to the small displacement, the other has a spring characteristic adapted to the medium displacement, and the leaf spring member has a spring characteristic adapted to a large displacement.

In this case, it is preferable that the first rubber member has a spring characteristic adapted to a small displacement, and the second rubber member has a spring characteristic adapted to a medium displacement.

[0012]

In the support system for the exhaust system member according to the present invention, the elastic member has three-stage spring characteristics adapted to small, medium and large vehicle body displacement levels, respectively. It is possible to absorb the vibration of the displacement level and also to absorb an excessive impact (large displacement) without breaking the elastic member.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a device for supporting an exhaust system member according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.

In the figure, the supporting device 1 has a through hole at the center.
A cylindrical first rubber member 2 coaxially provided with 2a, a cylindrical second rubber member similarly coaxially provided with a through hole 3a in the center, and first and second rubber members 2 and 3 are provided. It is constituted by the leaf spring member 4 to be connected.

The leaf spring member 4 is wound around the outer circumferences of the first and second rubber members 2 and 3 in opposite directions, and holds upper and lower end portions 4a and 4b for holding the rubber members 2 and 3, and these upper and lower ends. The intermediate part 4c integrally connects the parts 4a and 4b. The leaf spring member 4 and the first and second rubber members 2 and 3 are fastened by baking.

As shown in FIG. 3, the upper first rubber member 2 has a bracket 5 fixed to the vehicle body side in its through hole 2a.
Is inserted, and the second rubber member 3 below has a through hole 3a.
By inserting the bracket 6 fixed to the exhaust pipe side, the exhaust pipe side is connected to the vehicle body.

In this case, the first rubber member 2 supported by the bracket 5 on the vehicle body side is adapted to a small displacement level.
The second rubber member 3, which is formed of soft rubber having a hardness of 40 ° and a spring constant of about 10 kgf / 10 mm, and which supports the bracket 6 on the exhaust pipe side, has a hardness of 60 ° to adapt to a medium displacement level.
It is made of hard rubber with a spring constant of about 20 kgf / 10 mm. In this way, the second rubber member 3 that supports the bracket 6 on the exhaust pipe side is formed of hard rubber, and the first rubber member on the vehicle body side is formed.
The rubber member 2 is made of soft rubber because deterioration of the rubber member due to heat of the exhaust pipe is taken into consideration.

On the other hand, the leaf spring member 4 connecting the rubber members 2 and 3 is made of spring steel having a spring constant of about 50 kgf / 10 mm in order to adapt to a large displacement level including an excessive impact.

FIG. 4 is a graph showing the spring characteristics of the first and second rubber members 2 and 3 and the leaf spring member 4, respectively. In the figure, a curve A shows the spring characteristic of the first rubber member 2, a curve B shows the spring characteristic of the second rubber member 3, and a curve C shows the spring characteristic of the leaf spring member 4.

As described above, the exhaust system member supporting device 1 according to the present embodiment is constituted by the three types of elastic members 2 to 4 adapted to the displacement levels of small displacement, medium displacement and large displacement, respectively. It becomes possible to absorb a very wide range of vibrations including excessive shock.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an apparatus of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view showing a usage state.

FIG. 4 is a graph showing spring characteristics.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support device 2 1st rubber member 3 2nd rubber member 4 Leaf spring member 5,6 Bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Fujikawa 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (3)

[Claims] 1. A support device for an exhaust system member for elastically supporting an exhaust system member to a vehicle body via an elastic member, wherein the elastic member is adapted to three displacement levels of small displacement, medium displacement and large displacement, respectively. And a spring characteristic adapted to the large displacement level is set so as to be adapted to a state where an excessive impact is applied to the vehicle body. 2. The elastic member includes a first rubber member having a through hole into which a vehicle body side supporting member is inserted, and a second rubber member having a through hole into which an exhaust system member side supporting member is inserted. A leaf spring member that connects the first and second rubber members, wherein one of the first and second rubber members has a spring characteristic adapted to the small displacement, and the other has the middle displacement. The exhaust system member supporting apparatus according to claim 1, wherein the leaf spring member has a spring characteristic adapted to the large displacement, and the leaf spring member has a spring characteristic adapted to the large displacement. 3. The exhaust system according to claim 2, wherein the first rubber member has a spring characteristic adapted to a small displacement, and the second rubber member has a spring characteristic adapted to a medium displacement. Supporting device for members.