KR100868206B1 - Variable exhaust muffler of vehicles - Google Patents

Abstract

The present invention provides a variable muffler for a vehicle that realizes optimal exhaust performance by minimizing the occurrence of abnormal noise by configuring a variable exhaust means that operates in accordance with the exhaust pressure by the engine RPM on one side of the tube in the exhaust muffler.

Variable muffler, exhaust system, variable exhaust means

Description

VARIABLE EXHAUST MUFFLER OF VEHICLES}

1 is a cross-sectional view of a variable muffler according to the prior art.

2 is a cross-sectional view of a variable muffler for a vehicle according to an exemplary embodiment of the present invention.

3 is an enlarged cross-sectional view of a variable exhaust means applied to part A of FIG. 2.

4 is an operational state diagram of a vehicle variable muffler according to an embodiment of the present invention.

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

3,5; Front and rear exhaust pipe 7; housing

9,11; Bulkhead 13; Connecting tube

15; Variable exhaust means OP; Switchgear;

S; Sliding part SP; sliding tube

RS; Return spring

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable muffler for a vehicle, and more particularly, a variable exhaust means configured to operate variably according to the exhaust pressure due to engine RPM on one side of a tube in the exhaust muffler can realize optimal exhaust performance and reduced operating noise. The present invention relates to a variable muffler for a vehicle.

 In general, an exhaust system for vehicles emits high-temperature, high-pressure gas, which is a product of engine combustion, to the atmosphere, and attenuates exhaust noise generated at this time.

The performance of such an exhaust system is largely determined by two functions: reducing exhaust noise and reducing back pressure.To date, by optimizing the shape of a muffler or pipe, the exhaust system is faithful to the aforementioned two functions: noise reduction and back pressure reduction. Has been designed.

On the other hand, in recent years, in the effort to satisfy both the noise reduction and back pressure reduction is a trend that a variable muffler has been developed and mounted, this variable muffler is a variety of engines that were difficult to solve with the structure of the existing fixed exhaust system and muffler In order to show the effective performance in the RPM area, it has a variable muffler structure that operates by valve opening and closing to satisfy both of the opposite conditions of the low speed area and the high speed area.

5 is a configuration diagram of a variable muffler according to the prior art. Referring to the configuration according to an embodiment of the conventional variable muffler, the exhaust pipe before and after the housing 101 having a predetermined capacity having a quadrangular cross section or a cylindrical shape is illustrated. And a plurality of partitions 103 are installed in the housing 101, and a tube 104 penetrates one partition 103 in the longitudinal direction. The housing 101 has a dual-mode valve 105 for arbitrarily adjusting the magnitude of the back pressure applied to the exhaust gas introduced into the interior through the exhaust pipe 102 on the front side after combustion of the engine. It is provided.

Here, the dual mode valve 105 is mounted at the outlet of the lower exhaust pipe 102 fixed through two partitions 103 in the longitudinal direction, and the dual mode valve 105 is mounted at a low speed region. In the high speed region, the dual mode valve 105 is opened to change the path of the exhaust flow according to two conditions according to the back pressure, that is, the back pressure at the low speed or the high speed.

However, the variable muffler as described above has a structure that can change the path of the exhaust flow only through opening and closing of the dual mode valve, so that the flow of the exhaust gas from the engine can be adjusted only in two conditions of low speed and high speed. The path of the exhaust flow cannot be changed sensitively to the actual engine output and the exhaust flow rate, and thus there are problems such as noise reduction and limitation of optimization of the back pressure.

That is, the conventional dual mode valve has only a simple function of opening when the flow rate is large according to the spring force, and only reflects two conditions when opening and closing the valve, and it is virtually impossible to tune the valve in a specific area. In addition, when the exhaust gas is momentarily weakened, there is a problem in that the valve is momentarily closed and the quietness is impaired by the opening and closing sound generated when the valve touches the exhaust pipe.

Therefore, the present invention was created in order to solve the conventional problems as described above, an object of the present invention is to configure a variable exhaust means that is operated in accordance with the exhaust pressure by the engine RPM on one side of the tube in the exhaust muffler It is to provide a vehicle variable muffler that achieves exhaust performance and minimizes the occurrence of abnormal noise.

The vehicle variable muffler for achieving the above object of the present invention is a variable muffler for a vehicle for adjusting the back pressure by varying the exhaust flow path of the exhaust gas generated by combustion from the combustion chamber of the engine,

A housing having a hollow part connected to the front and rear exhaust pipes and having a hollow part divided into a multi-stage exhaust chamber in which a plurality of partition walls are installed; A connecting tube mounted inside the housing by a partition wall to connect the exhaust chamber of the multi-stage; And variable exhaust means mounted between the exhaust pipe outlet end of the front side and the inner wall of the housing, the variable exhaust means being operated to vary the degree of opening of the outlet end of the front exhaust pipe in accordance with the exhaust pressure.

The housing is characterized in that the inside is partitioned from each other by the first, second, third exhaust chamber from the front by the two partitions, the front exhaust pipe has its outlet end through the two partitions from the front of the inside of the housing It is characterized in that it is disposed in the exhaust chamber, the rear exhaust pipe is characterized in that the inlet end is disposed in the first exhaust chamber through the two partition walls from the rear of the inside of the housing.

The variable exhaust means may include a plurality of sliding tubes connected to each other through a sliding part while being mounted on an inner wall of the housing so as to correspond to an outlet end of the front exhaust pipe; An opening and closing pipe connected to a front end of the sliding pipe through a sliding part to directly open and close an outlet end of the front exhaust pipe; It is disposed inside the plurality of sliding tubes, one end is supported on the inner surface of the open tube, the other end is characterized in that it comprises a return spring supported on the inner wall of the housing.

The sliding part connecting the sliding tube or connecting the sliding tube and the opening and closing tube is characterized in that the 'c' shape and the inverse 'c' shape by walking to engage each other to generate a constant surface friction between each other.

The return spring is formed at both ends of the ring portion, the inner surface of the opening and closing tube and the inner wall of the housing, respectively, characterized in that the ring portion is fitted to each of the ring groove is installed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a cross-sectional view illustrating a variable muffler for a vehicle according to an exemplary embodiment of the present invention, and FIG. 3 is an enlarged cross-sectional view of a variable exhaust unit applied to part A of FIG. 2.

The variable muffler 1 for a vehicle according to the present invention adjusts the back pressure by varying the opening amount at the outlet end of the front exhaust pipe 3 on the exhaust flow path of the exhaust gas generated by combustion from the combustion chamber of the engine (not shown). do.

The specific configuration of the vehicle exhaust muffler 1 is installed by connecting the housing 7 by the exhaust pipes 3 and 5 of the front and rear, and the inner hollow portion of the housing 7 has two partitions 9 and 11. ) Is divided into three stage exhaust chambers (V1, V2, V3).

That is, the hollow part inside the housing 7 is partitioned from the front into the first, second and third exhaust chambers V1, V2 and V3 by the front and rear partition walls 9 and 11.

A connecting tube 13 is mounted on the front partition 9 in the housing 7 to connect the first and second exhaust chambers V1 and V2.

In addition, the front exhaust pipe 3 has an outlet end passing through the two partitions 9 and 11 from the front of the inside of the housing 7 in the third exhaust chamber V3, and the rear exhaust pipe ( 5, the inlet end thereof is disposed in the first exhaust chamber V1 through two partitions 9 and 11 from the rear of the inside of the housing 7.

In the third exhaust chamber V3, a variable exhaust means 15 is mounted between the outlet end of the front exhaust pipe 3 and the inner wall of the housing 7 so that the outlet of the front exhaust pipe 3 is discharged according to the exhaust pressure. However, it operates to vary the degree of opening.

The specific configuration of the variable exhaust means 15 is, as shown in Figure 3, through the sliding portion (S) in a state mounted on the inner wall of the housing (7) to correspond to the outlet end of the front exhaust pipe (3) Three sliding pipes SP are connected to each other.

Opening and closing pipe (OP) is connected to the front end of the sliding pipe (SP) through the sliding portion (S) is configured to directly open and close the open end of the front exhaust pipe (3).

In addition, a return spring RS is disposed in the three sliding pipes SP so that one end thereof is supported on an inner surface of the open tube OP, and the other end thereof is supported on an inner wall of the housing 7.

Here, the sliding portion (S) connected to each other or the sliding portion (S) for connecting the sliding tube (SP) and the opening and closing pipe (OP) is walking each other to engage the 'c' shape and the inverse 'c' shape to each other. To generate a constant surface friction force.

In addition, the return spring RS forms an annular portion 17 at both ends thereof, and forms an annular groove 19 on an inner surface of the opening and closing tube OP and an inner wall of the housing 7, respectively. It is preferable that the ring portions 17 are respectively fitted to 19).

Therefore, the operation of the vehicle variable muffler 1 according to the present invention having the configuration as described above, first, when the vehicle is traveling at a low speed (idle RPM or low RPM driving), as shown in Figure 2, the front exhaust pipe The exhaust pressure of the exhaust gas introduced through the lower portion 3 is small so that the elastic force of the return spring RS of the variable exhaust means 15 cannot be overcome so that the outlet end of the front exhaust pipe 3 is opened by the opening / closing pipe OP. Will remain closed.

At this time, the exhaust gas is discharged to the second exhaust chamber (V2) only through the exhaust port 21 of the front exhaust pipe (3) to increase the exhaust pressure, due to the increased exhaust pressure idle booming noise and low frequency booming noise It is to act to reduce the.

The exhaust gas introduced into the second exhaust chamber V2 is discharged through the rear exhaust pipe 5 through the first exhaust chamber V1 through the connection tube 13.

On the other hand, as shown in FIG. 4, when the vehicle gradually moves from the low speed to the high speed region and the exhaust pressure of the exhaust gas flowing through the front exhaust pipe 3 becomes large, the exhaust pressure is changed into the variable exhaust means ( The elastic force of the return spring RS of 15) is overcome, and the opening / closing pipe OP is pushed to adjust the opening amount of the outlet end of the front exhaust pipe 3 in accordance with the exhaust pressure of the exhaust gas.

At this time, the exhaust gas is simultaneously discharged to the second exhaust chamber V1 and the third exhaust chamber V3 through the exhaust port 21 and the outlet end of the front exhaust pipe 3 to increase the exhaust pressure at the highest RPM. This allows you to get the highest horsepower high power engine performance.

The exhaust gas introduced into the second exhaust chamber V2 is discharged through the rear exhaust pipe 5 through the first exhaust chamber V1 through the connecting tube 13 and the third exhaust chamber V3. The exhaust gas introduced into is discharged through the exhaust port 23 of the rear exhaust pipe 5.

In addition, in the high RPM region, when the opening and closing the opening (OP) is pushed open or closed by the exhaust pressure, the sliding portion (S) of each sliding pipe (SP) is slid to fold or spread with each other surface friction force is generated By removing the resonance phenomenon by the return spring (RS) to smoothly change the displacement of the opening and closing pipe (OP), it is possible to eliminate the occurrence of the opening and closing noise of the abnormal opening and closing pipe (OP).

Therefore, the vehicle variable muffler 1 of the present invention secures an exhaust chamber as a resonance chamber of a sufficient space so that the variable exhaust means 15 can attenuate exhaust noise (bumming noise) in the low frequency region in the low speed region. It is possible to achieve the optimum control of the back pressure, and the exhaust pressure of the exhaust gas is increased toward the high speed region so as to attenuate the exhaust noise caused by the generation of the high frequency air flow noise generated at the high speed, and to prevent the increase of the exhaust pressure It is possible to achieve the exhaust performance of.

According to the variable muffler for a vehicle of the present invention as described above, a variable exhaust means is formed in the exhaust muffler to adjust the amount of opening of the connection tube by the variable exhaust means according to the exhaust pressure of the exhaust gas discharged from the combustion chamber of the engine to the atmosphere. By doing so, there is an effect of minimizing the generation of exhaust noise in all areas, from low frequency noise in the low speed region to high airflow noise in the high speed region, and improving exhaust performance through optimum back pressure control.

Claims (7)

delete delete delete delete A housing having a hollow part connected to the front and rear exhaust pipes and having a hollow part divided into a multi-stage exhaust chamber in which a plurality of partition walls are installed; A connecting tube mounted inside the housing by a partition wall to connect the exhaust chamber of the multi-stage; Exhaust gas generated by combustion from the combustion chamber of the engine, including variable exhaust means mounted between the exhaust pipe outlet end of the front side and the inner wall of the housing and operating by varying the opening degree of the outlet end of the front exhaust pipe according to the exhaust pressure. In a variable muffler for a vehicle that adjusts the back pressure by varying the flow path, The variable exhaust means A plurality of sliding tubes connected to each other through a sliding part while being mounted on an inner wall of the housing so as to correspond to an outlet end of the front exhaust pipe; An opening and closing pipe connected to a front end of the sliding pipe through a sliding part to directly open and close an outlet end of the front exhaust pipe; And a return spring disposed inside the plurality of sliding tubes and having one end supported on an inner surface of the open tube and the other end supported on an inner wall of the housing. The method according to claim 5, Vehicles characterized in that the sliding portion is connected to each other or the sliding portion connecting the sliding tube and the opening and closing tube to form a constant surface friction between each other by walking to engage the 'c' shape and inverse 'c' shape. Variable muffler. The method according to claim 5, The return spring has a ring portion formed at both ends thereof, and a ring groove is formed on the inner surface of the opening and closing tube and the inner wall of the housing, respectively, and the ring portion is fitted into the ring groove.

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