KR20010092161A - Muffler for car - Google Patents

Abstract

PURPOSE: A motor vehicle muffler is provided to obtain an optimum noise attenuation effect while the engine is being driven at a low RPM and improved engine output while the engine is being driven at a high RPM. CONSTITUTION: A motor vehicle muffler comprises a case(1); first and second baffles(5,6) disposed in a vertical direction within the casing so as to define first, second and third chambers(2,3,4) inside of the case; an inlet pipe(7) transversely disposed within the case in such a manner that an end of the inlet pipe is communicated to the outside of the case and the other end of the inlet pipe is communicated to the third chamber, wherein the inlet pipe serves as an inlet passage of the exhaust gas emitted from an engine; an outlet pipe(8) having an end communicated to the second chamber, the other end communicated to the outside of the case and an intermediate portion formed into U-shape penetrating through the first chamber; a flow pipe(9) mounted to the second baffle in such a manner as to interconnect the second chamber and the third chamber; and a valve(10) arranged at the flow pipe, and which opens the flow pipe in a differential manner in accordance with the pressure of exhaust gas.

Description

Muffler for car}

The present invention relates to an automobile muffler, and in particular, a valve for differentially opening a flow tube in accordance with the pressure of the exhaust gas is installed at one outlet of the flow tube that becomes the flow passage of the exhaust gas inside the muffler, and the discharge pipe is formed in a long streamline. The present invention relates to an automobile muffler that effectively reduces noise when the engine is driven at a low rpm and improves the engine output by lowering the exhaust pressure when the engine is driven at a high rpm.

In general, the exhaust gas emitted from the engine includes explosion noise generated during combustion of the engine, and a muffler is installed in the vehicle to reduce such noise.

4 shows a conventional automobile muffler,

The case 21 is configured, and a plurality of baffles 26 are formed in the case 21 in a vertical direction to divide the inside of the case 21 into the first to fourth chambers 22 to 25.

In addition, an inlet pipe 27 for receiving exhaust gas discharged from the engine is formed in the case 21 so that one side thereof communicates with the outside of the case 21 and the other side communicates with the second chamber 23. The discharge pipe 28 is formed such that one side thereof communicates with the first chamber 22 and the other side thereof communicates with the outside of the case 21.

The first to third flow pipes (29, 30, 31) for circulating the exhaust gas introduced through the inlet pipe 27 to be discharged to the atmosphere through the discharge pipe 28, the case ( 21 is installed inside, the first flow pipe 29 is formed to connect the second chamber 23 and the fourth chamber 25, the second flow pipe 30 is the third chamber 24 and the fourth chamber It is formed to connect the 25, the third flow pipe 31 is formed to connect the first chamber 22 and the third chamber 24.

A plurality of flow holes 32 are formed on the outer circumferential surface of the third flow pipe 31 to guide the exhaust gas supplied through the inflow pipe 27 to move toward the first chamber 22.

The operation of the conventional muffler configured as described above is as follows.

Exhaust gas discharged from the engine is introduced through the inlet pipe 27, part of which is spread into the second chamber 23, and the other part is moved through the first flow pipe 29 to be supplied to the fourth chamber 25. do.

The exhaust gas supplied to the fourth chamber 25 moves back to the second chamber 24 through the second flow tube 30, and the exhaust gas moved to the second chamber 24 moves the third flow tube 31. It moves along and is supplied to the first chamber 22.

Meanwhile, the exhaust gas supplied to the second chamber 23 through the inflow pipe 27 moves to the first chamber 22 through the plurality of flow holes 32 formed in the third flow pipe 31. .

As described above, the exhaust gas moved to the first chamber 22 is discharged into the atmosphere through the discharge pipe 28, and as described above, the exhaust gas introduced into the inlet pipe 27 is divided into a plurality of chambers 22 ˜. 25) and the exhaust noise contained in the exhaust gas is attenuated during the movement of the flow tubes 29 to 31.

However, the conventional muffler has no problem in effectively attenuating the exhaust noise contained in the exhaust gas, but when the high pressure exhaust gas discharged when the engine is operated at high rpm flows into the muffler, the exhaust gas is supplied into the muffler. As the gas moves along various paths, it is not released to the atmosphere quickly, and the back pressure increases, which adversely affects the output of the engine. Therefore, the output of the engine decreases when the engine operates at a high rpm. It was.

Therefore, the present invention for solving the above problems is provided with a valve for differentially opening the flow pipe in accordance with the pressure of the exhaust gas at one outlet of the flow pipe that is the flow passage of the exhaust gas in the interior of the muffler, to form a streamlined discharge pipe It is an object of the present invention to provide an automobile muffler that effectively reduces noise when the engine is driven at a low rpm and lowers the exhaust pressure when the engine is driven at a high rpm.

Features of the present invention for achieving the above object,

A case;

First and second baffles installed vertically at predetermined intervals in the case to divide the interior of the case into first to third chambers;

An inlet pipe which is formed to cross the inside of the case in a horizontal direction so that one side communicates with the outside of the case and the other side communicates with the third chamber, and becomes an inflow passage of the exhaust gas discharged from the engine;

One side is in communication with the second chamber and the other side is in communication with the outside of the case so that the exhaust gas introduced into the case is discharged to the outside, the middle portion of the discharge pipe formed so as to penetrate the 'U' shape inside the first chamber; ;

A flow tube formed on the second baffle to connect the second chamber and the third chamber;

A valve configured to be opened and closed at one opening of the flow pipe to differentially open the opening of the flow pipe according to the exhaust pressure of the exhaust gas; Characterized in that consisting of.

The valve is characterized in that the rotating shaft formed on the upper side is rotatably rotatably supported by the support formed on the upper end of the flow tube, the outer peripheral surface of the rotating shaft to form a spring to apply elasticity in the direction of closing the opening of the flow tube.

In the middle portion of the inlet pipe is formed a plurality of flow holes in communication with the first chamber, the first baffle is characterized in that the through-holes for communicating the first chamber and the second chamber is formed, the outer peripheral surface of the middle portion of the discharge pipe There is formed a sound absorbing material made of glass fiber material, characterized in that formed on the outer circumferential surface of the discharge pipe in which the sound absorbing material is formed a plurality of through-holes to connect the sound absorbing material inside the discharge pipe.

1 is a cross-sectional view showing a muffler of the present invention.

Figure 2 is a cross-sectional view showing the operating state of the valve applied to the present invention.

Figure 3 is a front view showing a valve applied to the present invention.

4 is a cross-sectional view showing a conventional muffler.

※ Explanation of symbols for main parts of drawing

1: case 2, 3, 4: chamber

5,6 baffle 7: inlet pipe

8: discharge pipe 9: flow pipe

10: valve 11: spring

12: axis of rotation 13: support

14 flow hole 15 sound absorbing material

16,17: through

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 3.

Reference numeral 1 denotes a case 1 forming the outer shape of the muffler, and inside the case 1, the first baffle 5 and the second baffle 6 are vertically installed at a predetermined interval so that the inside of the case 1 is fixed. The first to third chambers (2 to 4) to be partitioned, the first baffle (5) at a predetermined position through which the first chamber (1) and the second chamber (3) to communicate is formed have.

An inlet tube 7 is formed at an inner lower end of the case 1 to allow the exhaust gas discharged from the engine to flow in. One side of the inlet tube 7 communicates with the outside of the case 1, and the other side of the case 1 is a third chamber. It was formed to cross the inside of the case (1) in the horizontal direction so as to communicate with (4).

A plurality of flow holes 14 are formed in front of the inlet pipe 7 to allow a portion of the inlet exhaust gas to move to the first chamber 2.

Reference numeral 8 denotes a discharge pipe for guiding the exhaust gas introduced into the case 1 to be discharged to the outside of the case 1, and the discharge pipe 8 is a first pipe installed through the first baffle 5 ( 81) and a second tube 82 installed through the first and second baffles 5 and 6 so that one side communicates with the first chamber 2 and the other side communicates with the outside of the case 1; It is formed of a 'U' shape is composed of a third tube (83) connecting the first tube (81) and the second tube (82).

That is, as shown in FIG. 1, the inlet side of the discharge pipe 8 has the inlet side of the first tube 81 on the second chamber 3, and the outlet side of the outlet tube 8 has the case 1. It is formed to communicate with the outside of the, and the middle portion of the discharge pipe (8) through the inside of the first chamber (2) using a third pipe (83) formed in the 'U' shape of the first pipe (81) ) And the second pipe 82 are interconnected.

On the outer circumferential surface of the middle part of the second pipe 82 constituting the discharge pipe 8, a sound absorbing material 15 formed of a glass fiber material absorbing and attenuating exhaust noise is formed, and the second pipe of the portion where the sound absorbing material 15 is formed. (82) On the outer circumferential surface, a plurality of through holes 16 are formed so that the exhaust gas moving through the discharge pipe 8 comes into contact with the sound absorbing material 15 through the through holes 16, thereby reducing the noise contained in the exhaust gas.

Meanwhile, in the inner center of the case 1, a flow tube 9 connecting the second chamber 3 and the third chamber 4 is formed to exhaust the gas introduced into the third chamber 4 through the inlet tube 7. The gas was allowed to move to the second chamber 3 side through the flow tube 9, and a valve 10 having an opening angle variable according to the exhaust pressure of the exhaust gas was installed on the outlet side opening of the flow tube 9. .

The valve 10 is rotatably axially supported on the support 13 formed on the upper end of the flow pipe (9) formed on the upper side of the valve 10 as shown in Figures 2 and 3 On the outer circumferential surface of the rotary shaft 12, the valve 10 is formed by forming a coil-shaped spring 11 that applies elasticity in a direction to block the outlet side opening of the flow tube 9.

Since the valve 10 is installed at the outlet side of the flow pipe 9, when the engine is driven at a low rpm, the exhaust pressure of the exhaust gas discharged from the engine is relatively weak, so that the valve 10 is elastic in the spring 11. By opening the flow pipe (9) only a little, whereby most of the exhaust gas discharged from the engine is moved to the first chamber (2) through the flow hole 14 formed on the inlet side of the inlet pipe (7) Therefore, it is possible to attenuate a lot of noise, and when the engine is driven at a high rpm, the exhaust pressure of the exhaust gas discharged from the engine becomes relatively strong, so that the valve 10 opens the spring 11 and opens a lot. Therefore, as most of the exhaust gas introduced through the inlet pipe 7 moves through the discharge pipe 8 existing in the second chamber 3 and is immediately discharged to the atmosphere, the back pressure inside the case 1 is lowered. Engine This force will be significantly improved.

Referring to the operation of the present invention configured as described above is as follows.

When the engine is driven at a low rpm, the exhaust pressure of the exhaust gas discharged from the engine becomes relatively low, and the valve 12 formed on the outlet side of the flow pipe 9 is almost closed.

As the valve 12 is closed, most of the exhaust gas introduced into the inlet pipe 7 moves to the first chamber 2 through the flow hole 14, and moves to the first chamber 2. The exhaust gas moves back to the second chamber 3 along the through hole 17 and then flows into the exhaust pipe 8 to move. The exhaust gas is transferred to the sound absorbing material 15 through the through hole 16 during the movement of the exhaust pipe 8. The noise is attenuated by the contact.

In addition, when the engine is driven at a high rpm, since the exhaust pressure of the exhaust gas discharged from the engine becomes relatively high, the valve 12 formed on the outlet side of the flow pipe 9 opens to overcome the elasticity of the spring 11. Most of the exhaust gas introduced through the inlet pipe 7 moves to the second chamber 3 through the flow pipe 9, and the exhaust gas moved to the second chamber 3 is discharge pipe 8 again. It is then emitted to the atmosphere.

As described above, at a high rpm, the valve 12 is opened, and the exhaust gas passes through a simple ring route consisting of the inlet pipe 7 → the flow pipe 9 → the discharge pipe 8. Since there is no big difference, the high-pressure exhaust gas from the engine is naturally discharged to the atmosphere, which helps the engine's output.

At low rpm, the valve 12 is blocked, and the exhaust gas flows into the inlet pipe 7 → the flow hole 14 → the first chamber 2 → the through hole 17 → the second chamber 3 → the discharge pipe 8. The attenuation rate of the exhaust noise contained in the exhaust gas is remarkably improved as the area of the passage through which the exhaust gas passes through the complex route is increased and decreased.

As a result, exhaust noise at low rpm was reduced by about 4 ~ 5dB compared with the conventional muffler.

As described above, the present invention is provided with a valve for differentially opening the flow pipe in accordance with the pressure of the exhaust gas at one outlet of the flow pipe that is the flow passage of the exhaust gas inside the muffler, and the discharge pipe is formed in a streamlined shape so that the engine is low When driving at rpm, the noise is effectively attenuated, and when the engine is driven at high rpm, the exhaust pressure is lowered to provide an automobile muffler that improves the engine output.

Claims (8)

A case 1; First and second baffles (5) (6) installed vertically at regular intervals in the case (1) to allow the interior of the case (1) to be partitioned into first to third chambers (2 to 4); An inlet pipe which is formed to cross the inside of the case 1 in a horizontal direction so that one side is in communication with the outside of the case 1 and the other side is in communication with the third chamber 4 ( 7); One side is in communication with the second chamber 3 and the other side is in communication with the outside of the case 1 so that the exhaust gas introduced into the case 1 is discharged to the outside, the middle portion of which is inside the first chamber 2. A discharge pipe 8 formed to penetrate the 'U' shape; A flow tube 9 formed on the second baffle 5 to connect the second chamber 3 and the third chamber 4; A valve (10) formed to be openable and openable at one side opening of the flow pipe (9) to differentially open the opening of the flow pipe (9) according to the exhaust pressure of the exhaust gas; Car muffler, characterized in that consisting of. The method of claim 1, The valve 10 is rotatably axially supported on the support 13 formed on the upper end of the flow tube 9, the rotary shaft 12 formed on the upper side, the valve 10 is the flow tube 9 on the outer peripheral surface of the rotary shaft 12 A muffler for automobiles, characterized by forming a spring (11) for applying elasticity in a direction of closing in an opening of the opening. The method of claim 1, A plurality of flow holes 14 communicating with the first chamber 2 are formed in the middle portion of the inflow pipe 7, and the first chamber 2 and the second chamber 3 are formed in the first baffle 5. Automotive muffler, characterized in that the through-hole 17 is formed so that the communication. The method of claim 1, A sound absorbing material 15 made of glass fiber material is formed on the outer circumferential surface of the middle portion of the discharge pipe 8, and the sound absorbing material 15 is connected to the inside of the discharge pipe 8 on the outer circumferential surface of the discharge pipe 8 on which the sound absorbing material 15 is formed. Automotive muffler, characterized in that formed a plurality of through-holes 16. A case 1; First and second baffles (5) (6) installed vertically at regular intervals in the case (1) to allow the interior of the case (1) to be partitioned into first to third chambers (2 to 4); An inlet pipe which is formed to cross the inside of the case 1 in a horizontal direction so that one side is in communication with the outside of the case 1 and the other side is in communication with the third chamber 4 ( 7); The first tube 81 installed through the first baffle 5 and the first and second baffles 5 so that one side communicates with the first chamber 2 and the other side communicates with the outside of the case 1. The second pipe 82 is installed through the (6) and the third pipe 83 is formed in a 'U' shape connecting the first pipe 81 and the second pipe 82 is composed of A discharge pipe 8 for discharging the exhaust gas introduced into the case 1 to the outside; A flow tube 9 formed on the second baffle 5 to connect the second chamber 3 and the third chamber 4; A valve (10) formed to be openable and openable at one side opening of the flow pipe (9) to differentially open the opening of the flow pipe (9) according to the exhaust pressure of the exhaust gas; Car muffler, characterized in that consisting of. The method of claim 5, The valve 10 is rotatably axially supported on the support 13 formed on the upper end of the flow tube 9, the rotary shaft 12 formed on the upper side, the valve 10 is the flow tube 9 on the outer peripheral surface of the rotary shaft 12 A muffler for automobiles, characterized by forming a spring (11) for applying elasticity in a direction of closing in an opening of the opening. The method of claim 5, A plurality of flow holes 14 communicating with the first chamber 2 are formed in the middle portion of the inflow pipe 7, and the first chamber 2 and the second chamber 3 are formed in the first baffle 5. Car muffler, characterized in that the through-hole 17 is formed so that the communication. The method of claim 5, A sound absorbing material 15 made of glass fiber material is formed on the outer peripheral surface of the middle portion of the second pipe 82 constituting the discharge pipe 8, and the discharge pipe (outside) is formed on the outer peripheral surface of the second pipe 82 on which the sound absorbing material 15 is formed. 8) A muffler for automobiles, characterized in that a plurality of through holes 16 are formed to connect the interior and the sound absorbing material 15 to each other.