JPS6332324Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust system for a vehicle, and more particularly to an improvement in a reinforcing support structure for a tail pipe to a muffler.

Particularly in the case of an exhaust system for a vehicle with a short rear length, in order to ensure the required length of the exhaust pipe, the tail pipe 102b is connected to the muffler 103 as shown in FIG.
It is practiced to extend from the front and curve towards the rear.

By the way, in such an exhaust system, the tail pipe 102b is designed to absorb the difference in thermal expansion between the tail pipe 102b and the muffler 103, and to prevent the generation of cracks due to vibration of the tail pipe 102b.
The vicinity of the outlet portion of the muffler 103 is supported by the rear part of the muffler 103 via a mount rubber 104 or the like.

However, such a support method has the disadvantage of complicating the structure and, as a result, making the exhaust device expensive.

The present invention has been made to effectively eliminate such inconveniences, and its purpose is to provide an inexpensive vehicle exhaust system that can simplify the reinforcement support structure for the tail pipe to the muffler.

In order to achieve such an object, the present invention provides a vehicle exhaust system in which a tail pipe extends from the front of a muffler and extends in a curved manner toward the rear, in which the tail pipe is supported at the front end of the muffler via a reinforcing bracket. That is the gist of it.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a vehicle equipped with an exhaust system according to the present invention, and FIG. 2 is a plan view of a muffler section of the exhaust system.

In the four-wheeled vehicle shown in FIG. 1, an exhaust system 1 is provided at the center of the lower part of the vehicle body and extends in the longitudinal direction of the vehicle body. It consists of an exhaust pipe 2 that guides and discharges the air, and a muffler 3 interposed between the exhaust pipe 2 and the muffler 3.

Incidentally, as shown in FIG. 2, the front surface of the muffler 3 is connected to the inlet end of a front pipe 2a that guides exhaust gas discharged from the engine combustion chamber to the muffler 3. An outlet end of a tail pipe 2b for discharging the muffled exhaust gas into the atmosphere is connected to the tail pipe 2b, and the other end of the tail pipe 2b is open to the atmosphere.
When this tail pipe 2b comes out from the front of the muffler 3, it is curved in a semicircular shape and extends rearward.
This is reinforced and supported at the front end of the muffler 3 via a reinforcing bracket 4 which is U-shaped in plan. The reason why the tail pipe 2b is led out from the front of the muffler 3 is to ensure the necessary pipe length in a vehicle with a short rear body as shown in FIG.

The front pipe 2a, muffler 3, and tail pipe 2b are heated by the high-temperature exhaust gas and thermally expand, and the elongation of each of them in the longitudinal direction of the vehicle body is as follows.
They exhibit different values due to differences in temperature, materials, geometric shapes, etc.

Among the above-mentioned extensions, the extension of the front pipe 2a causes the muffler 3 and the tail pipe 2b to integrally move rearward by this extension, so that at least the muffler 3 and the tail pipe 2b are not adversely affected.

The problem is the difference in thermal expansion between the muffler 3 and the tail pipe 2b, but in this embodiment, the tail pipe 2b
Since the muffler 3 is reinforced and supported at the front end of the muffler 3, no difference in thermal expansion occurs at this support point, that is, at the position of the reinforcing bracket 4 that connects both the muffler 2b and the muffler 3. In other words,
Since there is nothing behind the support point of the muffler 3 and tail pipe 2b to restrict the expansion of the muffler 3 and tail pipe 2b, they freely expand independently. Therefore, the difference in thermal expansion between the muffler 3 and the tail pipe 2b does not have any effect on the support of the tail pipe 2b, and the reinforcing bracket 4 is not required to have a function of absorbing the difference in thermal expansion, and a rigid body is sufficient for this purpose. . Further, since no thermal stress due to the difference in thermal expansion acts on the reinforcing bracket 4, the reinforcing bracket 4 can be made smaller and lighter, and the reinforcing support structure of the tail pipe 2b can be extremely simplified and inexpensive.

Although the reinforcing support structure of the tail pipe 2b to the muffler 3 has been simplified as described above, the reinforcing effect is the same as before, so it is possible to sufficiently prevent the occurrence of cracks due to vibrations of the tail pipe 2b as before. can.

As is clear from the above description, according to the present invention, in a vehicle exhaust system in which a tail pipe comes out from the front of the muffler and is curvedly extended to the rear, the tail pipe is connected to the front end of the muffler, that is, the tail pipe through a reinforcing bracket. Because the tail pipe is supported at a point where there is no difference in thermal expansion between the pipe and muffler, the structure is simple and the tail pipe is not affected by the difference in thermal expansion.
In addition, the tail pipe can be reinforced and supported at low cost, and the occurrence of cracks due to vibration of the tail pipe can be prevented.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a vehicle equipped with an exhaust system according to the present invention, FIG. 2 is an enlarged plan view of the muffler section of the exhaust system, and FIG. FIG. 2 is a plan view of a muffler section of an exhaust system according to a conventional example. In the drawings, 1 is an exhaust system, 2 is an exhaust pipe, 2a is a front pipe, 2b is a tail pipe, 3 is a muffler, and 4 is a reinforcing bracket.

Claims (1)

[Scope of utility model claims] 1. A vehicle exhaust system comprising a tail pipe extending from the front of a muffler and extending in a curved manner to the rear, characterized in that the tail pipe is supported at the front end of the muffler via a reinforcing bracket.