KR20200053953A - Variable silencer for a vehicle - Google Patents

Abstract

According to the present invention, a variable silencer for a vehicle comprises: a body; an input unit which is provided on one end of the body to provide a path to introduce discharge gas into an inner space of the body; and a discharge unit which is provided on the other end of the body to provide the path through which discharge gas is discharged to the outside of the body. If it is assumed that between the input unit and the discharge unit, a fixing unit is one fixed on one end of the body and a moving unit is one movably installed on the other end opposite to the one end of the body with the fixing unit fixed thereto, the moving unit is inserted into the body through an opening unit formed on the other end of the body, but is installed to be able to move straight in an approaching direction approaching the fixing unit, and in the opposite direction to the approaching direction. Accordingly, as the moving unit moves straight, the volume of the inner space of the body is changed and the differential pressure of the discharge gas is controlled. The variable silencer for a vehicle can effectively reduce noise generated according to various driving conditions of a vehicle.

Description

Variable silencer for vehicles {VARIABLE SILENCER FOR A VEHICLE}

The present invention relates to a variable silencer for a vehicle, and more particularly, to a variable silencer for a vehicle in which the volume of the inside of the silencer can be varied.

The noise introduced into the interior of the vehicle is caused by various factors such as engine driving, road curvature, or wind introduced during driving, and various devices are used in the vehicle to reduce the noise.

In particular, the exhaust gas discharged from the driving device of the vehicle (in the case of an internal combustion engine vehicle, an internal combustion engine, or a fuel cell in the case of a fuel cell vehicle) is quite hot and has a high flow rate, and thus rapidly expands when released into the atmosphere. It may cause noise. Therefore, in order to lower the temperature and pressure of the exhaust gas to reduce noise caused by the exhaust gas, a separate silencer is mounted on the exhaust gas passage of the vehicle.

Since the conventional muffler structure for a vehicle is fixed in shape, it has a disadvantage in that it cannot respond according to various driving conditions of the vehicle and the noise characteristic or noise performance is fixed.

For example, when the noise performance level of the muffler is fixed based on when the exhaust gas is a high flow rate, the noise is reduced when the exhaust gas is at a low flow rate, but the differential pressure of the exhaust gas increases due to the silencer. It may cause fuel consumption to decrease. Conversely, when the noise performance level of the silencer is fixed based on when the discharge gas is a low flow rate, there is a problem in that the noise reduction performance is deteriorated when the discharge gas is a high flow rate.

Therefore, there is a need for a structure capable of varying the noise performance of the silencer according to the driving conditions of the vehicle.

An object of the present invention is to provide a variable silencer for a vehicle that can effectively reduce noise generated according to various driving conditions of a vehicle.

In addition, it is an object to improve the noise performance and the fuel efficiency of the vehicle through this.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the variable silencer for a vehicle according to an embodiment of the present invention, the body; An inlet provided at one end of the body and providing a path through which exhaust gas flows into the interior space of the body; It is provided on the other end of the body, and includes an exhaust portion that provides a path through which exhaust gas is discharged to the outside of the body.

When the moving part is a movable part, a fixed part is fixed to one end of the body, and a movable part is installed at the other end opposite to one end of the body to which the fixed part is fixed. The part is inserted into the inside of the body through an opening formed at the other end of the body, and is installed so as to be able to move linearly in the direction opposite to the approach direction and the approach direction toward the fixing part.

As the moving part moves linearly, the volume of the internal space of the body is changed, and the differential pressure of the exhaust gas is adjusted.

According to an embodiment of the present invention, there are one or more of the following effects.

First, as the moving part moves in a straight line, the volume of the internal space of the body is changed and the differential pressure of the exhaust gas is adjusted, thereby effectively reducing noise generated according to various driving conditions of the vehicle.

Second, according to various driving conditions of the vehicle, for example, when the exhaust gas is at a low flow rate, by adjusting the differential pressure of the exhaust gas by the silencer, the noise performance and the fuel efficiency of the vehicle can be improved together.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a view of the silencer according to an embodiment of the present invention as viewed from one side.
2 and 3 are views for explaining the porous body of the silencer of FIG. 1.
4 and 5 are views for explaining the operation of the porous body of the silencer according to an embodiment of the present invention.
6 is a view for explaining the effect of the silencer according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing embodiments of the present invention, when it is determined that detailed descriptions of related well-known configurations or functions interfere with understanding of the embodiments of the present invention, detailed descriptions thereof will be omitted.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to the other component, but another component between each component It should be understood that may be "connected", "coupled" or "connected".

1 is a view of the silencer according to an embodiment of the present invention as viewed from one side.

The variable silencer for a vehicle according to the present embodiment includes a body 10, an inlet portion 20, and an outlet portion 30.

The body 10 forms the appearance of the silencer, and may have a shape having an internal space 10s.

Referring to FIG. 1, the body 10 may have a hollow cylindrical shape.

The inlet 20 is provided at one end of the body 10 and may provide a path through which the exhaust gas flows into the interior space of the body 10.

The discharge unit 30 may be provided at the other end of the body 10 and provide a path through which the discharge gas is discharged to the outside of the body 10.

Any one of the inlet portion 20 and the outlet portion 30 is fixed to one end of the body 10, and the other can be movably installed at the other end of the body 10.

Referring to FIG. 1, in this embodiment, the inlet 20 is fixed to one end of the body 10, and the outlet 30 is movably installed at the other end of the body 10.

Although not shown, in another embodiment, the inlet portion 20 is movably installed at one end of the body 10, and the outlet portion 30 may be fixed to the other end of the body 10, even in this case. It will be understood by those skilled in the art that the description according to the present embodiment described in the above can be applied in the same or similar manner.

Referring to FIG. 1, the discharge part 30 may be inserted into the body 10 through an opening formed at the other end of the body 10. The discharge part 30 may be installed in the body 10 so as to be able to move linearly in the opposite direction to the approach direction toward the inlet part 20.

Through this, as the discharge portion 30 is linearly moved, the volume of the interior space 10s of the body 10 is changed, and the differential pressure of the discharge gas can be adjusted. The differential pressure of the exhaust gas may be defined as a pressure at which the exhaust gas flowing into the silencer decreases as it passes through the silencer. That is, the differential pressure of the exhaust gas may be defined as a pressure difference between the exhaust gas before and after passing through the silencer.

Conventionally, the variable silencer for a vehicle has a fixed shape, and thus has fixed noise performance or noise characteristics. Therefore, there is a problem that it is difficult to effectively reduce the noise generated by the exhaust gas according to various driving conditions of the vehicle.

The silencer according to the present embodiment relates to a silencer having variable noise characteristics or noise performance in order to effectively reduce noise generated according to various driving conditions of a vehicle. More specifically, the silencer according to the present embodiment is inserted into the inside through one end of the body to change the internal volume of the silencer, but a moving part (either inlet or outlet) installed to enable linear movement There is a basic feature to include.

The features of the silencer according to this embodiment will be described in more detail below.

Referring to FIG. 1, the inlet 20 may be fixed by being inserted into the front end of the body 10. The inlet portion 20 may have a hollow cylindrical shape. The inlet 20 is connected to a vehicle driving device (such as an internal combustion engine or a fuel cell stack), and an exhaust gas (gas containing smoke in the case of an internal combustion engine vehicle, gas including air, hydrogen, etc. in a fuel cell vehicle) is driven. Can be introduced from.

The inlet 20 is an outer end 21 of the inlet that is fixed to the front end of the body 10 and an inner portion of the inlet extending from the outer end 21 of the inlet to the inner space 10s of the body 10 Column 22 may be included.

The outer end 21 of the inlet is formed to have a diameter of a size corresponding to the inner diameter of the body 10, and can be fixed to one end of the body 10.

The inner end 22 of the inlet may have a smaller diameter than the outer end 21 of the inlet. The inner end 22 of the inlet may have a smaller cross-sectional area of the flow path than the outer end 21 of the inlet.

The inlet 20 may include an inlet connecting end 23 connecting the outer end 21 of the inlet and the inner end 22 of the inlet.

Meanwhile, the inlet portion 20 may be provided as a body 10 and one piece. The inlet portion 20 may be configured as an integral body 10. That is, the inlet 20 may be formed as a part of the body 10.

The discharge unit 30 may be inserted into the other end of the body 10 and installed to be movable. The discharge unit 30 may form a flow path through which the exhaust gas is discharged to the outside of the body 10. The discharge unit 30 may be connected to an exhaust pipe (not shown) through which the exhaust gas is discharged.

The discharge part 30 is inserted in the approach direction through the other end of the body 10, and may be installed in the body 10 to allow linear movement in the opposite direction to the approach direction (see FIG. 1). The approach direction may be defined as a direction in which the discharge part 30 approaches the inflow part 20.

In one embodiment, in order to be provided so that the discharge unit 30 is movable in a linear direction, the discharge unit 30 may be installed to be movable in a linear direction even with respect to an exhaust pipe connected to the discharge unit 30. .

In another embodiment, the other end of the body 10 in which the discharge unit 30 is installed may be connected to an exhaust pipe through which exhaust gas discharged from the body 10 flows. The discharge unit 30 may be installed inside the body 10 to allow linear movement. That is, the first interior space in which the volume is reduced as the inner space discharge portion 30 of the body 10 is moved in the approach direction, and the second interior in which the volume is increased as the discharge portion 30 is moved in the approach direction May contain space. In this case, although the size of the entire interior space of the body 10 is constant, it is defined by the inlet 20 and the outlet 30 and the exhaust gas flows and noise is reduced. The volume can be adjusted as the discharge unit 30 is moved.

The discharge part 30 includes an outer end part 31 of a discharge part movably installed at the other end of the body 10, and a discharge part extending from the outer end 31 of the discharge part to the inner space 10s of the body 10 It may include an inner end (32).

The outer end 31 of the discharge portion is formed in a diameter having a size corresponding to the inner diameter of the body 10, and may be installed to be slidably moved to the other end of the body 10.

The inner end 32 of the discharge portion may have a smaller diameter than the outer end 31 of the discharge portion. The inner end 32 of the discharge portion may have a smaller cross-sectional area of the flow path than the outer end 31 of the discharge portion.

The discharge part 30 may include a connection end 33 of the discharge part connecting the outer end 31 of the discharge part and the inner end 32 of the discharge part.

The discharge portion 30 may include a push portion 34 that is in contact with the porous body 40 when moved in the approach direction and pushes the porous body 40 in the approach direction.

The push portion 34 may be formed to further protrude in the approach direction from the inner end 32 of the discharge portion. The push portion 34 may have a shape that protrudes further in the approach direction from a portion of the inner end 32 of the discharge portion.

The inner end 22 of the inlet and the inner end 32 of the outlet may face each other and be spaced apart.

As the discharge part 30 is linearly moved, the separation distance between the inner end 22 of the inlet part and the inner end 32 of the discharge part is adjusted, and the inner space of the body 10 at the inner end 22 of the inlet part ( The shortest distance that the exhaust gas discharged to 10s) moves to flow into the inner end 32 of the discharge part may be varied.

The silencer may further include a porous body 40 rotatably installed in a space between the inner end 22 of the inlet and the inner end 32 of the outlet. The porous body 40 is provided with a flow path having a directionality in a specific direction therein, so that the flow of exhaust gas can be controlled according to the rotation angle of the porous body 40.

Referring to FIG. 1, the porous body 40 may be installed inside the body 10 to be rotatable about the rotation shaft 41. The rotating shaft 41 is provided closer to the upper end than the lower end of the porous body 40, and the porous body 40 is pushed by the discharge part 30 and can be easily moved.

The porous body 40 is based on the shortest distance direction (left and right directions in FIG. 1) corresponding to the shortest distance from the inner end 22 of the inlet to the inner end 32 of the outlet, and the shortest distance direction and the porous body 40. A first position in which a specific direction forms a first angle (S1, see FIG. 1 (b)), and a second position in which the shortest distance direction and a specific direction of the porous body 40 form a second angle (S2, in FIG. 1). (see (a)). The second angle is an angle greater than the first angle.

That is, the porous body 40 may be provided to be rotatable between a first position S1 as shown in FIG. 1 (b) and a second position S2 as shown in FIG. 1 (a). To this end, the porous body 40 may be formed in a size that can be rotated inside the body 10. The shape, operation, and effects of the porous body 40 will be described later with reference to FIG. 2 or less.

The silencer may further include an elastic member 50 installed inside the body 10 to elastically support the porous body 40 to the second position S2.

Referring to Figure 1 (a), when the discharge portion 30 is located in the reference position, the porous member 40 by the elastic member 50 may be elastically supported to be located in the second position (S2). That is, the elastic member 50 may be provided with elastic support so that the porous body 40 is positioned at the second position S2 when the discharge unit 30 is positioned at the reference position.

Through this, even if the exhaust gas flows through the porous body 40, it can be prevented that the porous body 40 is rotated.

The elastic member 50 may have one end fixed to the inlet 20 and the other end fixed to the outlet 30. The elastic member 50 may be directly or indirectly connected to the porous body 40 at an intermediate portion of one end and the other end.

When the discharge portion 30 is moved in the approach direction, the lower end of the porous body 40 is pressed by the push portion 34 provided at the inner end 32 of the discharge portion, and the porous body 40 can be rotated. The position where the push portion 34 presses the porous body 40 may be between the rotating shaft 41 of the porous body 40 and the lower end of the porous body 40. Through this, even if the push portion 34 presses the porous body 40 with relatively little force, the porous body 40 can be easily rotated.

On the other hand, the push portion 34 may be provided with a configuration for cushioning the portion in contact with the porous body 40. Since the contact portion of the push portion 34 or the porous body 40 may be damaged as the push portion 34 comes into contact with the porous body 40, a configuration for cushioning the contact portion may be additionally provided.

On the other hand, the inner end 32 of the discharge portion, when the porous body 40 is rotated to the first position (S1), to prevent the rotation of the porous body 40 by the inner end 32 of the discharge portion, the porous body 40 It may be provided in a length or shape that is not in contact with the porous body 40 based on when is located in the first position (S1).

Referring to (a) and (b) of FIG. 1, for example, the inner end 32 of the discharge portion may have a shape in which the lower end protrudes more in the approach direction than the upper end. The inner end 32 of the discharge portion may have a shape that protrudes in an approaching direction from the top to the bottom. That is, the distal end of the inner end 32 of the discharge portion may have an inclined cross section. Through this, it can be prevented that the movement of the porous body 40 is disturbed by the discharge unit 30.

The porous body 40 is located in the first position S1 when the separation distance between the inner end 22 of the inlet and the inner end 32 of the outlet is minimal (see FIG. 1 (b)), and the inner side of the inlet. When the separation distance between the end 22 and the inner end 32 of the discharge portion is the maximum (see FIG. 1 (a)), it may be provided to be located in the second position S2.

The rotation of the porous body 40 may be achieved by appropriately installing the elastic member 50.

For example, in the state where the porous body 40 is located in the second position S2, the elastic member 50 may be installed to have the same elastic force on the left and right sides based on the portion connected to the porous body 40. Thereafter, the discharge portion 30 is moved and the elastic force of the right portion of the elastic member 50 on the right side is weaker than the left portion based on the portion connected to the porous body 40, and the porous body 40 can be rotated to the left. .

When the porous body 40 is positioned at the second position S2 (see (a) of FIG. 1), the cross-sectional area perpendicular to the approach direction of the porous body 40 (the vertical cross-sectional area based on FIG. 1) is The cross-sectional area of the flow path of the inner end 22 of the inlet portion may be wider, and the cross-sectional area of the flow path of the inner end 32 of the discharge portion may be larger.

Through this, the discharged gas discharged from the inner end 22 of the inlet to the inner space of the body 10 may be induced to pass through the porous body 40 before being discharged through the inner end 32 of the outlet. That is, by providing the cross-sectional area of the porous body 40 wider than the inner end 22 of the inlet portion and the inner end 32 of the outlet portion, the exhaust gas does not pass through the porous body 40 and is between the porous body 40 and the body 10. Since it is not easy to be discharged through the space of, the control of the exhaust gas flow by the porous body 40 can be performed more effectively.

The silencer may further include a driving unit 60 to move the discharge unit 30 in a straight line.

In one embodiment, the driving unit 60 may be configured to include an electromagnet provided at one end of the body 10 and provided to form a magnetic field when a current is applied. The driving unit 60 may be configured to include a magnet installed at the outer end 31 of the discharge unit. At this time, the magnet installed in the discharge unit 30 may be a permanent magnet.

In this case, in a state in which no electric current is applied to the electromagnet, the discharge part 30 may be located at a minimum distance from the inlet part 20 by the elastic force of the elastic member 50 (see FIG. 1B). When a current is applied to the electromagnet, the electromagnet installed in the body 10 and the magnet installed in the discharge unit 30 form a magnetic field, and the discharge unit 30 overcomes the elastic force of the elastic member 50 by magnetic force and approaches It is moved in the opposite direction.

On the other hand, when the driving unit 60 configured as above is used, the size of the magnetic field formed by the electromagnet and the magnet may be adjusted according to the amount of current applied to the electromagnet, and thus the distance to which the discharge unit 30 moves may also be applied. It can be easily adjusted according to the current.

Meanwhile, the configuration of the driving unit 60 is not limited to this, and various types of driving units, including mechanical or electronic, may be applied, and it is sufficient if the discharge unit 30 can be linearly moved in the approaching direction and the opposite direction.

2 and 3 are views for explaining the porous body of the silencer of FIG. 1.

Referring to FIG. 2, the porous body 40 may include a plurality of flow passages 40h having directionality in the reference direction A1. The reference direction A1 of the plurality of flow passages 40h may form a predetermined angle with one side of the porous body 40. For example, as shown in FIG. 2, an angle formed between one side of the porous body 40 and the reference direction A1 may form an acute angle.

3 is a view of the porous body 40 as viewed from one side, and the porous body 40 is viewed in the approach direction in FIG. 1.

A plurality of flow paths 40h may be formed in the porous body 40 over the entire region of the porous body 40.

4 and 5 are views for explaining the operation of the porous body of the silencer according to an embodiment of the present invention.

If the first angle (θ1) between the reference direction (A1) of the porous body 40 and the flow direction (F) of the exhaust gas is relatively small or is 0 degrees as shown in FIG. 4, the exhaust gas is the porous body 40 The flow resistance received during passage is small, and accordingly, the pressure reduction value of the exhaust gas is small.

In comparison, when the second angle θ2 formed by the reference direction A1 of the porous body 40 and the flow direction F of the exhaust gas is relatively larger than the first angle θ1 as shown in FIG. 5, the exhaust gas The flow resistance received while passing through the porous body 40 is large, and accordingly, the pressure reduction value of the exhaust gas is large.

6 is a view for explaining the effect of the silencer according to an embodiment of the present invention.

In this experiment, as an experiment for explaining the flow resistance according to the angle between the flow path direction of the porous body 40 and the flow direction of the exhaust gas, gas is moved from region A to region B of FIG. 6, and regions A and B The gas movement to the furnace was interpreted as being limited to passing through the passage.

Referring to FIG. 6, when the flow direction of the flow path and the exhaust gas forms a predetermined angle as in Experiment 1, the flow path resistance received by the exhaust gas through the flow path is large, and accordingly, the average flow rate of the exhaust gas after passing through the flow path It is also reduced a lot.

In Experiment 2, when the flow direction of the flow path and the exhaust gas are parallel, as in the case where the porous body 40 is rotated at a predetermined angle, the flow path resistance through the flow path and the discharge gas received is smaller than that in Experiment 1, and thus after passing the flow path. The average flow rate of the exhaust gas is reduced to less than Experiment 1.

Through this, it is possible to check the effect on the flow of the exhaust gas by rotating the porous body 40 having directionality in a specific direction. That is, by adjusting the angle between the flow path direction of the porous body 40 and the flow direction of the exhaust gas, the flow resistance received by the exhaust gas can be adjusted, and accordingly the differential pressure of the exhaust gas can be adjusted.

The silencer provided in this way can primarily control the flow of the exhaust gas by adjusting the volume of the inner space 10s of the body 10 by linear movement of the discharge unit 30, and in addition, has a directionality. The flow of the exhaust gas can be more effectively controlled by the rotation of the porous body 40. Since the noise is generated by the flow of the exhaust gas, the noise generated by the exhaust gas can be reduced by controlling the flow rate and pressure by controlling the flow of the exhaust gas.

Meanwhile, according to the present invention, the linear movement of the discharge unit 30 and the rotation of the porous body 40 may be organically combined with each other. That is, in a state in which power is not applied as in one embodiment of the present invention, the discharge unit 30 is located at the reference position, the porous body 40 is located at the first position S1, and the power applied to the silencer is increased. Accordingly, the discharge unit 30 may gradually move in the opposite direction of the approaching direction, and the porous body 40 may also be rotated to the second position S2.

Through this, it is possible to effectively reduce noise caused by exhaust gas while varying the noise characteristics of the silencer while minimizing power consumption.

Although the present invention has been described above by way of limited examples and drawings, the present invention is not limited by this, and is described below by the person skilled in the art to which the present invention pertains, and the technical idea of the present invention. Various implementations are possible within the equal scope of the claims to be made.

10: body
10s: interior space
20: inlet
21: outer end of the inlet
22: inner end of the inlet
23: connecting end of the inlet
30: discharge unit
31: outer end of the discharge section
32: inner end of the discharge section
33: outlet end connection
34: push part
40: porous body
40h: porous passage
41: rotating shaft
50: elastic member
60: driving unit
A1: Reference direction of porous body
D1: Movement distance of the discharge part
S1, S2: 1st, 2nd position
F: Flow direction of exhaust gas
θ: angle of rotation of the porous body
θs: Passage angle of porous body
θ1: first angle
θ2: second angle

Claims (9)

body;
An inlet provided at one end of the body and providing a path through which exhaust gas flows into the interior space of the body; And
It is provided on the other end of the body, and includes an exhaust portion for providing a path for the exhaust gas is discharged to the outside of the body
When it is said that the moving part is movably installed on the other end of the inlet part and the outlet part, which is fixed to one end of the body, and the other end which is the opposite end of the one end of the body to which the fixing part is fixed,
The moving part is inserted into the body through the opening formed at the other end of the body, and is installed so as to be able to move linearly in the opposite direction to the approaching direction and the approaching direction approaching the fixing part,
As the moving part moves linearly, the volume of the internal space of the body changes, and the differential pressure of the exhaust gas is controlled, a variable silencer for a vehicle. The method according to claim 1,
The inner end of the fixing portion and the inner end of the moving portion are disposed to face each other and spaced apart,
As the moving part is linearly moved, a separation distance between the inner end of the fixing part and the inner end of the moving part is adjusted, and the exhaust gas discharged from the inner end of the fixing part to the inner space of the body is inside the moving part. A variable silencer for a vehicle, in which the shortest distance traveled to enter the vehicle is variable. The method according to claim 2,
In order to control the flow of the exhaust gas, it is rotatably installed in the separation space between the inner end of the fixed portion and the inner end of the moving portion, and further includes a porous body having a flow path having a direction in a specific direction,
The porous body,
Based on the shortest distance direction corresponding to the shortest distance from the inner end of the fixing part to the inner end of the moving part, the first position where the shortest distance direction and the specific direction of the porous body form a first angle, and the shortest distance The direction and the specific direction of the porous body are moved between the second positions forming the second angle, and the second angle is an angle greater than the first angle,
When the separation distance between the inner end of the fixing portion and the inner end of the moving portion is minimal, the porous body is located in the first position, and the separation distance between the inner end of the fixing portion and the inner end of the moving portion is maximum, A variable silencer for a vehicle, wherein the porous body is provided to be located in the second position. The method according to claim 3,
In order to elastically support the porous body to the second position, further comprising an elastic member installed inside the body,
The variable silencer for a vehicle, as the moving part moves in the approach direction, the inner end of the moving part pushes the porous body, and the porous body is rotated from the second position to the first position. The method according to claim 4,
Based on when the porous body is positioned at the second position, the cross-sectional area of the porous body perpendicular to the approach direction is larger than the flow path cross-sectional area of the inner end of the fixing part and wider than the flow path cross-section of the inner end of the moving part. , Vehicle variable silencer. The method according to claim 4,
The rotating shaft of the porous body is located closer to the opposite end than one end of the porous body connected to the elastic member,
The inner end of the moving part, the variable silencer for a vehicle, by pushing a portion of the porous body between the rotating shaft of the porous body and the elastic member, so that the porous body is rotated. The method according to claim 6,
The moving part includes, at an inner end adjacent to the porous body, a push portion protruding toward the porous body and contacting the porous body when the moving portion moves in the approach direction, wherein the porous body is rotated to the first position when A variable silencer for a vehicle, provided so as not to be disturbed by a moving part. The method according to claim 4,
The elastic member, one end is fixed to the fixing portion, the other end is fixed to the moving portion, the central portion is connected to the porous body, a variable silencer for a vehicle. The method according to claim 1,
And a driving unit providing a driving force for linearly moving the moving unit.

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