JPH0213695Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a mount rubber for an exhaust system in an automobile.

(Prior art) As a conventional mount rubber of this type, the first
There is something like the one shown in the figure (NISSAN Service Bulletin No. 440 NISSAN Stanza FX, Auster
JX, Violet Liberta page 87 (Published by Nissan Motor Co., Ltd. June 1981).

The mount rubber 1 has two through holes 2 and 3 formed at both ends thereof for attachment. A bolt 4 is inserted into one of the through holes 2 and is screwed onto the vehicle body (not shown), a bracket 6 is fixed by inserting a bolt 5 into the other through hole 3, and the bracket 6 is fixed with a bolt 7 (see the figure). It is fixed to an external exhaust device, and the exhaust device is elastically supported to the vehicle body by a mount rubber 1.

The mount rubber 1 is mounted in this way and has the effect of blocking vibrations transmitted from the engine to the exhaust system from being transmitted to the vehicle body, and there is a need to appropriately lower the elastic modulus to effectively exert this vibration blocking effect. The shape and material are selected so as to satisfy as much as possible the contradictory demands of increasing the elastic modulus to improve durability. The through hole 8 formed in the center of the mount rubber 1
This is to adjust the elastic modulus of

However, in the case of the mount rubber 1 of the conventional exhaust system, the elastic modulus has to be set slightly higher in order to ensure its durability, and the through holes 2 and 3 have to be set to the diameter of the bolts 4 and 5. Since it was formed with a circular hole of a suitable diameter, there was a problem in that vibrations from the engine, especially high-frequency vibrations that are difficult to absorb by the mount rubber 1, were transmitted to the vehicle body, causing muffled noise.

(Purpose of the invention) This invention was made in view of such conventional problems, and by forming at least one of the through holes as a long hole extending toward the other through hole, it is possible to The purpose of this invention is to allow the mount rubber to move relative to the support rod inserted into the elongated hole, thereby absorbing high frequency vibrations acting in the direction of contraction of the mount rubber, thereby solving the above-mentioned problems.

(Example) This invention will be explained below with reference to an example shown in FIGS. 2 to 4.

The exhaust device mount rubber 10 is made of rubber or elastomer and has two through holes 1 for mounting.
1 and 12 are formed. One of the through holes 11 is formed as a circular hole, and the other through hole 12 is formed with both side surfaces 12.
a and 12b are elongated holes that form a width across flats and extend toward one of the through holes 11. By forming the elongated through hole 12 to an appropriate length, the elastic modulus of the mount rubber 10 can be adjusted.

Such a mount rubber 10 is made by inserting a pipe spacer 13 into one of the through holes 11 as shown in FIG.
A bolt 14 is inserted through this and fixed to a bracket 15 on the exhaust system side, a pipe spacer 16 is similarly loosely fitted into the other through hole 12, a relatively large diameter washer 17 is inserted, and a bolt 18 is inserted. It is inserted and fixed to the bracket 19 on the vehicle body side. Thus, the pipe spacer 13 and the bolt 14 constitute a support rod 26 erected on the exhaust device, and the pipe spacer 16 and the bolt 18 constitute a support rod 27 erected on the vehicle body.

The exhaust device 24 is made of such a mount rubber 1.
For example, as shown in FIG. 4, the vehicle body is supported at four locations by a first mounting 20, a second mounting 21, a third mounting 22, and a fourth mounting 23.

According to this mount rubber 10, low-frequency vibrations transmitted from the engine to the exhaust system 24 are absorbed by the elastic deformation of the mount rubber 10, and high-frequency vibrations that compressively deform the mount rubber 10 are absorbed by the vehicle body side. Since the mount rubber 10 moves upward and absorbs the pipe spacer 16 and bolt 18 that constitute the support rod 27, the noise inside the vehicle can be significantly reduced.

Reference numeral 25 denotes a stopper, which is attached to the bracket 19 on the vehicle body side for the purpose of restricting excessive upward movement of the mount rubber 10, but the stopper action can also be provided to the vehicle body itself. Also, the mount rubber 10 may fall off at the bent edge 25a of the stopper 25.
This is prevented by the action of the washer 17.

Note that the through hole 11 on the side of the support rod 26 may be formed as a long hole.

(Structure of the invention) As explained above, according to this invention, the structure is such that the support rod installed upright on the vehicle body and the support rod installed upright on the exhaust device are respectively inserted into the through holes of the mount rubber. In the mount rubber of the exhaust system that elastically connects to the vehicle body, at least one through hole is formed as a long hole extending toward the other through hole, and the support rod inserted into the long hole is The mount rubber of the exhaust system allows relative movement of the mount rubber.

(Effect of the invention) Therefore, with a mount rubber that has been given approximately the same elastic modulus as conventional mount rubber in consideration of vibration absorption and durability, it is possible to reduce the amount of low-frequency vibration generated by the engine from the exhaust system to the vehicle body. In addition to effectively preventing the transmission of high-frequency vibrations, the present invention also has the effect of reducing the transmission of high-frequency vibrations and reducing vehicle interior noise such as muffled sounds.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional mount rubber, Figure 2 is a perspective view of a conventional mount rubber.
The figure is a front view showing one embodiment of this invention, FIG. 3 is a sectional view of the same in the installed state, and FIG. 4 is an exploded perspective view of the exhaust device. 10: Mount rubber, 11, 12: Through hole, 1
3, 16: Pipe spacer, 14, 18: Bolt, 1
5, 19: Bracket, 17: Washer, 24:
Exhaust device, 26, 27: Support rod.

Claims (1)

[Scope of utility model registration request] At least one through hole in the mount rubber of the exhaust system that elastically connects the exhaust system to the vehicle body by inserting a support rod erected on the vehicle body and a support rod erected on the exhaust device through the through holes of the mount rubber. is formed by a long hole extending toward the other through hole,
A mount rubber for an exhaust system, characterized in that the mount rubber is allowed to move relative to a support rod inserted into the elongated hole.