JPS5853608B2 - How to install a vehicle muffler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing a muffler for a vehicle such as an automobile.

A muffler installed in an engine exhaust system of an automobile or the like usually has a structure in which a muffler 1 is attached to a vehicle body member 6 via an elastic material 5 such as rubber, as shown in FIG.

A bellows pipe 4 is interposed in the middle of the exhaust pipe 3 from the exhaust port of the engine 2 to the muffler 1. is configured so that it is not directly transmitted.

In such a case where a bellows pipe is used as a part of the exhaust pipe, the engine side and the muffler side are relatively displaced due to their respective vibrations, but this displacement is particularly large in the shear direction, and the bellows pipe 4 As shown in Figure 2A, it is deformed in the shearing direction with respect to the center line, and stress is concentrated at both ends A and B, causing a decrease in durability.

The present invention provides a structure in which a bellows pipe is interposed in the middle of the exhaust pipe as described above, so that only simple bending stress acts on the bellows pipe as shown in the opening of Figure 2 due to relative displacement between the engine and the muffler. The purpose of the present invention is to alleviate stress and improve durability of a bellows pipe by providing a muffler mounting method.

The invention will now be described with reference to the embodiments shown in FIGS. 3 and 4.

FIG. 3 shows a first embodiment of the present invention, in which a muffler 1
A part of the muffler 1 is elastically supported by the vehicle body member 6 via the elastic member 5 as before, and brackets 7a and 7b are attached to the muffler 1.
The above brackets 7a are provided on the brackets 8a and 8b provided on the engine 2.

7b are rotatably attached to each other by pins 9at9b, and a line It passes approximately through the central portion G.

In this way, by floating a part of the muffler 1 on the vehicle body member and rotatably supporting it on the engine 2, the relative displacement of the muffler 1 and the engine 2 due to vibrations is regulated at the shaft attachment part. , the relative displacement occurs only in the direction of rotation about the line Due to the relative displacement of , the bellows tube 4 is only deformed into a simple gentle arc shape as shown in Figure 2, and the stress is dispersed throughout, and stress concentration due to deformation in the shear direction as shown in Figure 2A is avoided in the conventional case. will never occur.

FIG. 4 shows a second embodiment of the present invention. In this example, one rotation center in the embodiment of FIG. brackets) 7b', respectively connected to tubes 3b;
8b' and pin 9b'#. In this example as well, the line X connecting the two rotation centers C2D is configured to pass through approximately the center G in the longitudinal direction of the bellows tube 4, and the muffler 1 and the engine The relative displacement of 2 is only rotation around the line X, and the bellows tube 4 is deformed as shown in the opening in Figure 2.
The stress in the bellows tube 4 can be significantly alleviated.

Bracket (7b) installed on the muffler side exhaust pipe 3a in this example
' may be attached to muffler 1.

As described above, in the present invention, the muffler, which is floatingly supported by a vehicle body member via an elastic material, is supported by a shaft so that it can rotate toward the engine side, and the center line of rotation of the muffler with respect to the engine side is aligned with the exhaust pipe. By adopting a support method that passes approximately the longitudinal center of the bellows pipe inserted in the middle, the relative displacement between the muffler and the engine (
Based on this, the deformation of the bellows tube can be reduced to a simple gentle bending deformation in which stress is distributed throughout the tube, which can greatly alleviate the stress of the bellows tube and significantly improve its durability. This can have a huge effect.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing a conventional general muffler mounting structure.
FIG. 2 is a diagram showing the state of deformation of the bellows pipe due to the vibrations of the muffler and the engine, in which the figure A shows the conventional one and the figure 2 shows the one according to the present invention. FIGS. 3 and 4 are explanatory diagrams showing embodiments of the present invention, respectively. 1...Muffler, 2...Engine, 3.
...Exhaust pipe, 4...Bellows pipe, 5...
...Elastic material, 6...Vehicle body member, 7a, 7b
t7b...Muffler side bracket, 8a, 8b,
8b'...Engine side bracket, 9at9b
, 9b'...pin.

Claims (1)

[Claims] 1. In a system where a bellows pipe is used as part of the exhaust pipe between the engine and the muffler, a part of the muffler is floatingly supported by a vehicle body member via an elastic material, and a line passing through approximately the center of the bellows pipe in the longitudinal direction A method for mounting a muffler for a vehicle, characterized in that the muffler is supported by an engine so that it can rotate about a rotation center.