KR960001917Y1 - Muffler of a car - Google Patents

Abstract

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Description

Automotive Silencer

1 is an installation state in which the silencer for automobiles according to the present invention is mounted on a vehicle.

2 is a longitudinal cross-sectional view of a silencer for automobiles according to the present invention.

3 is an enlarged cross-sectional view of part A of FIG.

4 is a front view as seen in the direction B in FIG. 3 (when the engine is at low rotation).

5 is a longitudinal sectional view of a conventional automobile silencer.

* Explanation of symbols for main parts of the drawings

1: body 2: partition

3: inlet pipe 4: auxiliary pipe

5: outlet pipe 6: variable valve

7: Variable Pipe 8: Fixture

9: spring support shaft 10: spring

The present invention relates to an automobile muffler, and more particularly, to an automobile silencer that can reduce noise and improve engine performance by changing the flow path of exhaust gas according to the engine speed.

In general, a car silencer is a cylindrical or rectangular metal box installed under the rear floor of a car to reduce exhaust noise of exhaust gas emitted from the engine and to reduce exhaust pressure. Various types have been proposed and implemented, but in general, when the noise resistance is increased to increase the noise effect, the explosion sound of the engine is lowered, but the resistance applied to the exhaust stroke, that is, there is a problem that the output of the engine is lowered due to the increased back pressure.

A typical embodiment of a conventional automobile silencer is shown in FIG. 5, and this conventional silencer structure has a partitioned form, and exhaust gas and exhaust noise enter the inlet pipe 13 of the silencer body 11 to resonate with the expansion chamber. It is discharged to the outlet pipe 15 while passing through the yarn in stages. However, the exhaust gas discharged at the low or high rotation of the engine is discharged through the same path, that is, even if the exhaust resistance varies depending on the operating state, the exhaust gas outlet path inside the muffler follows the same flow path. The noise effect can be increased, but there was a problem that the engine performance is degraded at high power of the engine.

Accordingly, the present invention has been made to solve the above problems, by changing the flow path of the exhaust gas discharged according to the number of revolutions of the engine to provide a silencer for automobile to improve the back pressure reduction and engine performance. There is a purpose.

The present invention for achieving the above object is, a plurality of partitions are installed inside the body, the inlet pipe, the auxiliary pipe and the outlet pipe is installed through the partitions, the silencer for automobiles, neighboring to the auxiliary pipes Therefore, a variable pipe having a variable valve is installed, and the variable valve is a disc of a diameter slightly smaller than the internal diameter of the variable pipe, and has a structure in which the variable valve is elastically supported on a spring installed through a spring support shaft.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, a plurality of partitions (2) are installed inside the body (1), and the inlet pipe (3), the auxiliary pipe (4) and the outlet pipe (5) are installed through the partitions (2). In the silencer, a variable pipe (7) having a disk-shaped variable valve (6) is provided adjacent to the auxiliary pipe (4), and the variable valve (6) is fixed to a variable pipe (7). Is supported on the spring (10) which is installed via the spring support shaft (9). In addition, the disk diameter of the variable valve (6) is a disk of a diameter slightly smaller than the inner diameter of the variable pipe (7) has a spring-bearing structure of the spring provided via the spring support shaft to the holding table. Further, the disc diameter of the variable valve valve 6 is formed to be smaller than the internal diameter of the variable pipe 7 and is attached, and the carbon coefficient of the spring 10 that supports the variable valve 6 at the time of high engine power is applied. It is set smaller than the back pressure of the exhaust gas discharged.

Referring to the operation of the present invention having such a structure, the exhaust gas discharged at the low power of the engine flows through the inlet pipe 13 to the auxiliary pipe 4 as shown in the arrow direction of the solid line of FIG. The gas is allowed to escape to the outlet pipe 5 and the noise effect can be enhanced by the auxiliary pipe 4 having a small diameter. Here, as well as mounting the carbohydrate coefficient of the spring 10 in advance so that the pressure of the exhaust gas at the low output of the engine can not open the cylindrical variable valve (6) of the variable pipe (7), therefore, at the low output of the engine The exhaust gas discharged is such that only the inlet pipe 13, the auxiliary pipe 4, and the outlet pipe 5 flow in stages.

On the other hand, the exhaust gas discharged at the high output of the engine is exhaust gas exiting the inlet pipe (3) through the auxiliary pipe (4) and the variable pipe (7) as shown in the solid line and dashed line arrow of FIG. It is made to exit the outlet pipe 5, and as the exhaust flow path becomes larger, the exhaust resistance is reduced, so that the engine performance is improved. The exhaust gas discharged at the high output of the engine has a large back pressure, so that the disk-shaped variable valve 6 of the variable pipe 7 is shifted from the solid line position in FIG. A portion of the exhaust gas is passed through, wherein the coefficient of elasticity of the spring 10 for supporting the disc-shaped variable valve 6 is set smaller than the back pressure of the exhaust gas discharged at high power of the engine. Therefore, the exhaust gas discharged at the high output of the engine flows through the inlet pipe 3 through the auxiliary pipe 4 and the variable pipe 7 to the outlet pipe 8.

As described above, the automobile silencer according to the present invention changes the flow path of the exhaust gas that varies depending on the engine speed as the variable pipe 7 having the disc-shaped variable valve 6 is installed on the body 1. By reducing exhaust resistance, noise can be reduced and engine performance can be improved at high engine power.

Claims (3)

A plurality of partitions (2) are installed inside the body (1), and the inlet pipe (3), the auxiliary pipe (4) and the outlet pipe (5) are installed side by side through the partitions (2) In the silencer, a variable pipe (7) having a disk-shaped variable valve (6) is installed so as to be parallel to the auxiliary pipe (4), and the variable valve (6) is fixed to the variable pipe (7). Silencer for the automobile, characterized in that the elastic support is installed in the spring (10) which is installed through the spring support shaft (9) to (8). 2. The silencer for automobile according to claim 1, wherein the spring coefficient of the spring (10) for supporting the variable valve (6) is set smaller than the back pressure of the exhaust gas discharged at the high output of the engine. 2. The silencer for automobile according to claim 1, wherein the disc diameter of the variable valve (6) is formed slightly smaller than the internal diameter of the variable pipe (7).