KR100848195B1 - Noise reduction structure of exhaust pipe - Google Patents

Abstract

A structure for reducing noise in an exhaust pipe is provided to substitute for a conventional muffler by stacking branch pipes having the shape of hemispheres of different radius and thereby reducing noise of various frequency bands, thus increasing space utilization, and to reduce manufacturing costs due to the reduction of the number of parts, and to increase durability against external shocks. An exhaust system includes an exhaust pipe(10) which is a gas discharge path extending from an engine to the outside. A structure for reducing noise in the exhaust system is constructed so that branch pipes(20,30,40) having the shape of hemispheres of different radiuses are provided on one end of the exhaust pipe in such a way as to be stacked. The plurality of branch pipes is provided on the exhaust pipe, thus reducing noise of various frequency bands. The length of the branch pipes provided on the exhaust pipe is increased toward the stacking direction.

Description

Noise reduction structure of exhaust pipe {NOISE REDUCTION STRUCTURE OF EXHAUST PIPE}

The present invention relates to a noise reduction structure of an exhaust system for a vehicle. In particular, one side of the exhaust pipe is configured such that a hemispherical branch pipe having a different radius is stacked to reduce noise in various frequency bands. It is possible to replace the conventional muffler used in, and to reduce the noise structure of the exhaust pipe to improve the durability against external impact.

1 is a block diagram showing a general exhaust system.

Referring to FIG. 1, an exhaust system of a general vehicle that discharges exhaust gas combusted by an engine to the outside includes a front muffler 100 for reducing vehicle vibration, a converter 200 for purifying exhaust gas, and exhaust noise. The center muffler 300 and the rear muffler 400 are provided to reduce the exhaust gas. The exhaust gas discharged from the engine is purged of harmful components through the configuration as described above, and is discharged to the atmosphere with reduced noise and vibration. Will be.

However, in the conventional vehicle, the muffler (300, 400) must be additionally installed to reduce exhaust noise, and in particular, the structure of the muffler (300, 400) is complicated in order to reduce noise of various frequency bands. This increases, there is a problem that the number of parts increases the manufacturing cost increases.

In addition, the conventional vehicle has a problem that the exhaust pipe is damaged when the durability of the exhaust pipe is weak and the external impact is severe.

An object of the present invention is to configure one side of the exhaust pipe to be a stack of hemispherical branch pipes having different radii to reduce the noise of various frequency bands can replace the conventional muffler used for noise reduction It is possible to increase the space utilization of the narrow assembly space, to reduce the manufacturing cost by reducing parts, and to provide a noise reduction structure of the exhaust pipe that can improve the durability against external impact.

In the noise reduction structure of the exhaust pipe according to the present invention, in the noise reduction structure of the exhaust system including an exhaust pipe which is an exhaust gas flow path from which the exhaust gas combusted by the engine is discharged to the outside, one side of the exhaust pipe is mutually The hemispherical branch tube having a different radius is characterized in that it is configured to be stacked.

The branch pipe formed in the exhaust pipe is characterized in that the structure is closed in one end so that the sound wave of noise enters and exits the branch pipe to be 180 degrees out of phase with each other.

Branch pipes formed in the exhaust pipe may be made of a plurality of to reduce the noise of various frequency bands, the length of the branch pipes formed in the exhaust pipe is characterized in that the longer the longer in the stacking direction.

The noise reduction structure of the exhaust pipe according to the present invention is configured so that one side of the exhaust pipe is a stack of hemispherical branch pipes having different radii to reduce noise in various frequency bands, which has been used for noise reduction. It is possible to replace the muffler can increase the space utilization of the narrow assembly space, reduce the manufacturing cost by reducing the parts, and improve the durability against external impact.

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

2 is a perspective view showing a state of the exhaust pipe according to the present invention, Figure 3 is a cross-sectional view showing the state of the exhaust pipe according to the present invention.

2 and 3, the noise reduction structure of the exhaust pipe according to the present invention is the noise of the exhaust system including the exhaust pipe 10 which is the exhaust gas flow path until the exhaust gas burned in the engine to the outside In the reduction structure, one side of the exhaust pipe 10 is configured such that hemispherical branch tubes 20, 30, and 40 having different radii are stacked.

At this time, the branch pipes 20, 30, and 40 formed on the exhaust pipe 10 may have a plurality of structures, one end of which is closed, to reduce noise of various frequency bands, and The length becomes longer toward the stacking direction.

Since the engine of the vehicle is driven under a high temperature and high pressure state, it is necessary to reduce exhaust noise emitted through the exhaust system. In order to reduce the exhaust noise, one side of the exhaust pipe 10 has a hemispherical shape having a different radius. The branch pipes 20, 30, and 40 are configured to be stacked in order to reduce the exhaust noise according to the exhaust flow of the exhaust gas without additional installation of a muffler.

Sound waves of the exhaust noise flowing into the branch pipes 20, 30, and 40 formed on one side of the exhaust pipe 10 and sound waves of the exhaust noise entering and exiting the branch pipes 20, 30, and 40 are formed in the branch pipe ( The phase difference of 180 ° at the inlet of the 20, 30, 40 is extinguished with each other, and the branch pipes 20, 30, and 40 having different lengths are formed in a stacked form, which is laminated by Equation 1 below. As the number of branch pipes 20, 30, and 40 increases, the branch pipes 20, 30, and 40, which are longer, can further reduce noise in a high frequency region, and the exhaust pipe 10 As the thickness of one side becomes thicker, the durability against external impact is also improved.

f: frequency c: sound speed

L: length of path of sound wave formed in branch pipe

1 is a block diagram showing a general exhaust system,

2 is a perspective view showing a state of the exhaust pipe according to the present invention;

3 is a cross-sectional view showing the appearance of the exhaust pipe according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: front muffler 200: converter

300: center muffler 400: rear muffler

10: exhaust pipe 20, 30, 40: branch pipe

Claims (4)

In the noise reduction structure of the exhaust system comprising an exhaust pipe which is an exhaust gas flow path until the exhaust gas combusted by the engine is discharged to the outside, Noise reduction structure of the exhaust pipe, characterized in that one side of the exhaust pipe is configured so that hemispherical branch pipes having different radii are stacked. The method of claim 1, The branch pipe formed in the exhaust pipe noise reduction structure of the exhaust pipe, characterized in that one end is blocked in order to extinguish the sound wave of the sound as it enters and exits the branch pipe by 180 ° phase difference. The method of claim 1, Branch pipe formed in the exhaust pipe is made of a plurality of noise reduction structure of the exhaust pipe, characterized in that to reduce the noise of various frequency bands. The method of claim 1, Noise reduction structure of the exhaust pipe, characterized in that the length of the branch pipe formed in the exhaust pipe is longer toward the stacking direction.

Images