KR20040035264A - dual mode muffler of vehicle - Google Patents

Abstract

PURPOSE: A dual mode muffler of an automobile is provided to satisfy conditions of reduction of noise and back pressure, and to be usefully used in an exhaust system of next generation. CONSTITUTION: A muffler has a valve unit(30) installed in a discharge tube(13), and having opening degree controlled depending on engine RPM and quantity of discharged combustion gas. The valve unit comprises a first rotary triangular flap(310) and a second rotary triangular flap(330) installed by a first hinge shaft(311) and a second hinge shaft(331) fixed to an inside of the discharge tube to be separated from each other, and a first torsion spring and a second torsion spring installed to cover the first hinge shaft and the second hinge shaft in such a manner that the first rotary triangular flap and the second rotary triangular flap are elastically rotated and a linear movement triangular flap(350) installed by a guide shaft(351) fixed to the discharge tube to form a triangle together with the first hinge shaft and the second hinge shaft, and a compression spring(353) connected with the guide shaft in such a manner that the linear movement triangular flap is elastically and linearly moved in longitudinal direction of the discharge tube. The linear movement triangular flap is installed so that one of corners thereof is inserted to a space between the first rotary triangular flap and the second rotary triangular flap and both side thereof contact with the first rotary triangular flap and the second rotary triangular flap.

Description

Dual mode muffler of vehicle

The present invention relates to a dual-mode muffler of an automobile, and in particular, by installing a valve means in the exhaust pipe that automatically adjusts the opening amount according to the engine RPM and the exhaust gas exhaust gas to satisfy both the opposite conditions of noise reduction and back pressure reduction. It is about the dual mode muffler of the car.

In general, the exhaust system of automobiles not only guides high-temperature, high-pressure gas, which is the product of combustion, to proper place, but also functions as a device for attenuating the combustion noise generated at that time.

The function of the exhaust system is largely divided into noise reduction and back pressure reduction, and until recently, attempts to satisfy both factors of noise reduction and back pressure reduction have been continuously conducted. A dual mode muffler has been developed.

The dual mode muffler is provided with a valve means in the discharge pipe constituting the muffler, the valve means is configured to open when the engine RPM is closed in the low speed region and the high speed region.

As shown in FIG. 1, the conventional structure of the dual mode muffler 10 is formed of an oval steel plate to form a body of the muffler 10, and a plurality of diaphragms 11a are disposed therein at regular intervals. 11 and an inlet pipe connected to an exhaust manifold for collecting combustion gas of the engine, the front end of which is installed so as to be positioned in the housing 11 by sequentially passing through one side of the housing 11 and the diaphragm 11a. 12) and one end is located in the housing 11 while being in parallel with the inflow pipe 12, and the other end is installed through the plurality of diaphragms 11a and the other side of the housing 11 sequentially. Intake noise of the outside air sucked into the housing 11 while wrapping and fixing the exhaust pipe 13 to discharge the exhaust gas to the outside and the inflow and exhaust pipes 12 and 13 located in the housing 11. To reduce Material consists of (in FIG. 1, not shown).

Here, the discharge pipe 13 is composed of a pair as shown in the figure, one of which is a high speed discharge pipe (13a) equipped with a valve means 21 and the other one valve means (21) ) Is a low speed discharge pipe (13b) is not mounted, each discharge pipe (13a, 13b) are spaced apart from each other are installed in parallel.

On the other hand, the valve means 21 is set to be operated only when the engine RPM is low speed and high speed, that is, it is sealed at low speed when the engine RPM is below a certain value, on the contrary, it opens at high speed when the engine RPM is above a certain value. To work.

Accordingly, the valve means 21 is not operated when the engine RPM is between a low speed and a high speed, and thus the conventional dual mode muffler 10 is sensitive to the engine RPM and the displacement of the combustion gas. There was a problem that can not be.

Accordingly, the present invention has been made to solve the above problems, by installing a valve means in which the opening degree is automatically adjusted according to the engine RPM and the exhaust gas exhaust amount in the exhaust pipe constituting the muffler, to reduce the noise and back pressure The goal is to provide a dual-mode muffler for automobiles that meets all requirements and can be used in next-generation exhaust systems.

In the present invention for achieving the above object, in the dual mode muffler of the vehicle is installed in the discharge pipe for the valve means which the opening degree is adjusted according to the engine RPM and the exhaust gas exhaust amount to discharge the exhaust gas to the outside, The valve means is elastically rotated by a first torsion spring and a second torsion spring installed while surrounding the hinge shaft and the first hinge shaft and the second hinge shaft are installed to be fixed to the inner surface of the discharge pipe, A first rotary triangular flap and a second rotary triangular flap which are installed to be possible; Straight moving triangular flap is installed to enable elastic straight reciprocating movement in the longitudinal direction of the discharge pipe by a guide shaft fixed to the discharge pipe to form a triangle with the first and second hinge axis and a compression spring connected to the guide shaft. It consists of; The linearly moving triangular flap is characterized in that the corner portion is inserted into the space between the first and second triangular flaps so that both sides are installed to make contact with the first and second triangular flaps.

1 is a longitudinal cross-sectional view illustrating a dual mode muffler according to a conventional embodiment;

Figure 2 is a partial cutaway side view for explaining a dual mode muffler equipped with a valve means according to the invention,

3 is a perspective view for explaining the valve means of the dual mode muffler according to the present invention;

4 and 5 are conceptual views for explaining the operation of the valve means mounted to the dual mode muffler according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10-Muffler 13-Exhaust Pipe

30-valve means 310-first rotary triangle flap

311-First Hinge Shaft 313-First Torsion Spring

330-2nd triangular flap 331-2nd hinge shaft

333-2nd Torsion Spring 350-Linear Travel Triangle Flap

350a-Guide Hole 351-Guide Shaft

353-compression spring

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

Figure 2 is a partial cutaway side view for explaining a dual mode muffler equipped with a valve means according to the present invention, will be described with the same reference numerals to the same parts as the conventional structure.

The valve means mounted on the dual mode muffler according to the present invention is characterized in that the opening amount is automatically adjusted according to the engine RPM and the exhaust gas exhaust amount.

Here, the dual mode muffler is developed to satisfy both the noise reduction and the back pressure reduction function of the exhaust system, and the structure thereof is shown in FIG. 2.

That is, the general structure of the dual mode muffler 10 is formed of an oval steel sheet to form the body of the muffler 10, and a plurality of diaphragms 11a are disposed therein at regular intervals, and the combustion of the engine. An inlet pipe 12 connected to an exhaust manifold for collecting gas and having a front end thereof sequentially penetrated through one side of the housing 11 and a diaphragm 11a and positioned in the housing 11; In parallel with 12, one end is positioned in the housing 11 and the other end is installed through the plurality of diaphragms 11a and the other side of the housing 11 in sequence to discharge the exhaust gas in the housing 11 to the outside. Sound absorbing material 14 to reduce the suction noise of the outside air sucked into the housing 11 while wrapping and fixing the discharge pipe 13 and the inlet and discharge pipes 12 and 13 located in the housing 11. ) And the discharge wave Profile is provided in the 13 it consists of a valve means (30) for so as to satisfy both the noise reduction and back pressure reduction function of the exhaust system having as automatically adjusting the amount of opening in accordance with the displacement of the engine RPM and the combustion gas.

On the other hand, the valve means 30 provided in the dual mode muffler 10 according to the present invention is largely as shown in Figs. 3 to 5 the first rotary triangle flap 310 and the second rotary triangle flap 330 and The linear moving triangle flap 350, the first rotating triangle flap 310, the second rotating triangle flap 330 and the linear moving triangle flap 350 are each composed of a plurality, these discharge pipe ( The structure is installed while facing each other in the radial direction of 13).

That is, the first hinge shaft 311 having a predetermined length is installed on the inner surface of the discharge pipe 13 so as to be fixed using a coupling method such as welding, and the first rotation shaft is mounted on the first hinge shaft 311. The flap 310 is rotatably coupled to the central portion thereof, and the first torsion spring 313 is wrapped in the first hinge shaft 311 so that one end thereof is fixed to the first hinge shaft 311. It is coupled and the other end is coupled to be fixed to the first rotary triangle flap (310).

Accordingly, the first rotation triangle flap 310 is added to the elastic force by the first torsion spring 313 when rotated about the first hinge axis (311).

The second rotary triangular flap 330 has a first hinge triangular flap 333 on one side of the first rotary triangular flap 310 and a second torsion spring 333 as a medium. 310 is installed by the same coupling method.

Further, the guide shaft 351 is fixed to a predetermined portion of the discharge pipe 13 having a triangular shape with the first and second hinge shafts 311 and 331, and the guide hole 350a is provided in the guide shaft 351. The formed linearly moving triangular flap 350 is provided, the guide shaft 351 is installed to pass through the guide hole 350a, the compression spring 353 is a hole 350a as the guide hole (350a) While being disposed along the longitudinal direction of the one end is coupled to the guide shaft 351 and the other end is coupled to the inner surface of the guide hole 350a is installed.

Here, the guide hole (350a) is formed in an elliptical shape extending in the longitudinal direction of the discharge pipe 13, accordingly, the linear movable triangular flap 350 is the longitudinal direction of the discharge pipe (13) It is possible to perform the elastic straight reciprocating movement along.

On the other hand, when the linear movable triangle flap 350 is installed, one of the three corner portions of the corner portion is inserted into the space between the first and second triangular flaps (310,330) is installed, and thus the linear movement triangle Both sides of the flap 350 are installed while making contact with the first and second triangular flaps 310 and 330.

Hereinafter, the operation of the valve means 30 mounted on the dual mode muffler 10 according to the present invention will be described in detail with reference to FIGS. 4 and 5.

First, when the engine is turned on to drive the vehicle or when the engine RPM is low (usually driving at 20 km / h or less), as shown in FIG. Due to this, the exhaust noise and the exhaust pressure of the combustion gas are kept low, and in this state, the first torsion spring 313 and the second torsion spring 333 even though the combustion gas passes through the discharge pipe 13. It is impossible to win the force of), and thus the first and second triangular flaps 310 and 330 do not rotate.

As such, when the exhaust pressure of the combustion gas is low and the first and second triangular flaps 310 and 330 do not rotate, the opening amount of the valve means 30 is kept to a minimum.

Afterwards, when the driver gradually steps on the accelerator pedal for high speed driving of the vehicle, the engine RPM is increased to change to a high speed state (usually driving at 20 km / h or more), thereby increasing exhaust noise. The amount of exhaust gas also gradually increases, and the pressure of the exhaust gas passing through the exhaust pipe 13 also increases.

As such, when the pressure of the exhaust gas passing through the discharge pipe 13 is increased, the pressure overcomes the forces of the first torsion spring 313 and the second torsion spring 333, and thus the first and second triangular flaps. As shown in FIG. 5, the linear movement triangular flap 350 is linearly moved in a direction opposite to the discharge direction of the combustion gas while being rotated in the discharge direction of the combustion gas, as illustrated in FIG. 5. The opening amount of 30 is also gradually increased.

Therefore, when the exhaust noise is increased due to the increase of the engine RPM and the opening amount is gradually increased in proportion to the size of the exhaust noise and the exhaust pressure, the valve means 30 according to the present invention increases when the pressure of the exhaust gas is increased. It is possible to reduce the exhaust noise which is made and also to reduce the exhaust pressure which is increased.

On the other hand, the valve means 30 shown in FIG. 5 shows a state in which the opening amount is maximum.

When the engine RPM is changed to a low speed according to the driving condition of the vehicle, the first and second triangular flaps 310 and 330 which are rotated in the discharge direction of the combustion gas by the exhaust pressure of the lower combustion gas have the first and second torsion springs ( 313 and 333 are rotated in a direction opposite to the discharge direction of the combustion gas by the elastic restoring force of the 313 and 333, and the linear moving triangle flap 350 is also discharged in the combustion gas discharge direction by the elastic restoring force of the compression spring 353. The linear movement is returned to, the opening degree of the valve means 30 is gradually reduced.

As such, when the valve means 30 according to the present invention in which the opening degree is automatically adjusted according to the change amount of the engine RPM and the exhaust amount of the combustion gas is mounted on the dual mode muffler 10, the noise reduction and the back pressure reduction are functions of the exhaust system. It can be satisfied in any condition, which has the advantage that can significantly improve the performance of the exhaust system.

In addition, since the performance of the exhaust system is improved, it is possible to reduce vibrations and noise transmitted to the vehicle body, and thus, there is an advantage that can also help the vehicle's NVH performance.

As described above, according to the present invention, the valve means according to the present invention, in which the opening degree is automatically adjusted according to the change amount of the engine RPM and the exhaust amount of the combustion gas, is mounted in the dual mode muffler. It can be satisfied under any conditions, and this has the effect of greatly improving the performance of the exhaust system.

Claims (4)

In the dual mode muffler of an automobile provided in the exhaust pipe 13 for allowing the valve means whose opening amount is adjusted in accordance with the engine RPM and the exhaust gas exhaust amount to exhaust the exhaust gas to the outside, The valve means 30 is installed to surround the first hinge shaft 311 and the second hinge shaft 331 and their hinge shafts (311, 331) are installed to be fixed to the inner surface of the discharge pipe 13 while being spaced apart from each other. A first rotation triangle flap 310 and a second rotation triangle flap 330 which are installed to be rotatably rotatably by the first torsion spring 313 and the second torsion spring 333, respectively; The discharge pipe 13 by a guide shaft 351 fixed to the discharge pipe 13 to form a triangle with the first and second hinge shafts 311 and 331 and a compression spring 353 connected to the guide shaft 351. It consists of a straight moving triangular flap 350 is installed to enable a flexible straight reciprocating movement in the longitudinal direction of the; The linearly moving triangle flap 350 is installed so that either side of the edge is inserted into the space between the first and second triangular flaps 310 and 330 so that both sides are in contact with the first and second triangular flaps 310 and 330. Dual-mode muffler of the car. According to claim 1, wherein the first and second triangular flaps (310, 330) and the linear movement triangular flap 350 is composed of a plurality each and is installed facing each other in the radial direction of the discharge pipe (13) Dual mode muffler in the car. The elliptical guide hole 350a extending in the longitudinal direction of the discharge pipe 13 is formed in the linear moving triangular flap 350. The guide hole 350a includes a guide shaft (a). The front end of the 351 is installed while the compression spring 353 is disposed along the longitudinal direction of the hole 350a in the guide hole 350a, and one end thereof is coupled to the guide shaft 351, and the other end thereof is the guide hole (3). Dual mode muffler of the vehicle, characterized in that installed in combination with the inner surface of (350a). According to claim 1, wherein the opening amount of the valve means 30 is the first and second rotary triangle flap (310.330) is rotated in the discharge direction of the combustion gas when the engine RPM is increased and the exhaust amount of the combustion gas is increased As the linear movement triangle flap 350 is linearly moved in a direction opposite to the discharge direction of the combustion gas, the linear movement triangle flap is gradually increased, and the first and second rotation triangle flaps are reduced when the engine gas is reduced and the exhaust gas emissions are reduced. Dual mode of the vehicle, characterized in that the linear movement triangle flap 350 gradually decreases as the linear movement triangle flap 350 is linearly returned in the discharge direction of the combustion gas while the 310.330 is rotated in a direction opposite to the discharge direction of the combustion gas. Muffler.