KR101993833B1 - Reduced noise car muffler - Google Patents

Abstract

The present invention relates to a vehicle muffler which drastically reduces exhaust noises, increases a flow rate to improve exhaust force when discharging exhaust gas generated from an engine to the outside, and prevents the generated exhaust gas from being stagnant in the engine to increase the entire output of the engine. Accordingly, the present invention comprises: an exhaust pipe (210) which comprises a vortex generation part (211) formed at an introducing side of exhaust gas, a laminar flow generation part (212) formed at a discharging side of the exhaust gas, and a through hole (213) formed between the vortex generation part (211) and the laminar flow generation part (212), wherein a spiral wing (211a) protrudes from an inner side of the vortex generation part (211) and a straight line wing (212a) protrudes from an inner side of the laminar flow generation part (212); a housing (220) which has a hollow cylindrical structure, has through holes on both sides thereof to enable the exhaust pipe (210) to penetrate therethrough, has inside filled with a sound absorbing material (230), and has a double pipe structure equipped with a hollow part (224) formed by an outer wall (220a) and an inner wall (220b); and an impact attenuation part (240) which has a cylindrical structure, is in connection with and fixed with a through hole (220c) provided on an outer side of the housing (220), and attenuates sudden impacts.

Description

[0001] The present invention relates to a muffler for a vehicle having reduced noise,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler constituting an exhaust system of a vehicle, and more particularly, to a muffler constituting an exhaust system of a vehicle, It is possible to improve the engine performance by increasing the output by reducing the load of the exhaust stroke of the engine according to the outflow of exhaust gas at a rapid rate, and it is possible to improve the engine performance by significantly reducing the shift noise and vibration at the time of shifting, To a muffler for a vehicle in which noise is reduced so that an excellent ride feeling can be felt

2. Description of the Related Art Generally, a vehicle is composed of various driving devices such as an engine, a suspension device, a body frame, a steering device and the like. Particularly, the engine is driven by suction, compression, expansion (explosion) .

Here, in the course of the expansion stroke of the engine, a certain amount of exhaust gas is generated, and the generated exhaust gas is discharged by the exhaust stroke. As a device for discharging such exhaust gas to the outside, a catalytic converter and a muffler are used.

In the process of exhausting the exhaust gas generated from the engine to the outside as described above, carbon monoxide, hydrocarbons and nitrogen oxides are reduced by the catalyst and introduced into the muffler in a reduced state

1 is a cross-sectional view of a conventional muffler.

As shown in the drawing, the conventional muffler comprises a muffler body 10 partitioned by a partition plate 11 to form a plurality of compartment chambers 12a, 12b and 12c, one end connected to an exhaust pipe of the exhaust system, An intake pipe 13 communicating with a central partitioning chamber 12b between the downstream and upstream chambers and an exhaust pipe 13 communicating with the upstream partitioning chamber 12c at one end and extending outside the muffler body 10 at the other end 14) and at least one communication pipe (15) for guiding the exhaust gas provided from the intake pipe (13) to be circulated in the compartment chamber in the muffler body (10) and finally discharged through the exhaust pipe do.

The conventional muffler configured as described above circulates through each of the compartment chambers through the communication pipe 15 to reduce noise through sound absorption and resonance, and finally to the outside through the exhaust pipe 14.

However, in the muffler according to the related art, when the accelerator pedal is depressed to accelerate the vehicle, the exhausting power and the exhaust amount of the exhaust gas are instantaneously increased. At this time, the exhaust gas is exhausted from the partitioning chamber 12c to the exhaust pipe 14 The lag phenomenon occurs in the compartment chambers 12a and 12c due to the instantaneous increase of the exhaust power and the exhaust amount.

Such a rack phenomenon usually occurs at the time of shifting or during a rapid acceleration, which can not smoothly exhaust the exhaust gas, deteriorates the exhaust gas pressure and exhaust power, resulting in a loss of the overall engine output, There is a problem that the driver feels uncomfortable due to the shifting noise and vibration at the point of time and the resonance sound at the time of acceleration, thereby deteriorating the ride quality.

Published Patent Publication No. 1998-083532 (published on Dec. 5, 1998)

The present invention significantly reduces exhaust noise and improves the exhaust power by increasing the flow rate of exhaust gas generated from the engine to the outside and prevents the generated exhaust gas from stagnating inside the engine to increase the overall engine output I want to have it.

A muffler for a vehicle having reduced noise according to the present invention includes a vortex generating part formed on a side to which exhaust gas flows, a laminar flow generating part formed on a side from which exhaust gas is discharged, and a through hole formed between the vortex generating part and the laminar flow generating part; The exhaust pipe has a cylindrical hollow structure. On both sides of the exhaust pipe, a through hole is formed through the exhaust pipe. A sound absorbing material is filled in the exhaust pipe. And a shock absorber having a cylindrical structure and being connected to the vent hole provided on the outer surface of the housing and being damped by an abrupt impact.

Further, the housing has a sound insulating plate formed on the hollow portion formed by the outer wall and the inner wall; The sound insulating plate is a truss structure that resonates and attenuates an incident sound wave to form a unit cavity portion in which a light weight and a high strength are maintained, and a spring is mounted on the upper and lower surfaces of the unit cavity portion to attenuate vibration and noise .

The impact damper has a cylindrical structure, a case communicating with a vent hole formed on an outer surface of the housing, and a communicating hole formed in an upper portion thereof, a partition plate partitioning the case upwardly and downwardly, A first expansion plate which is made of a resilient material and which is fixed to an inner wall on the lower side of the case to form a first hydraulic pressure chamber; and a second expansion valve which is made of an elastic material capable of expanding and contracting, And a second expansion plate for forming the second expansion plate.

The muffler for a vehicle with reduced noise according to the present invention significantly reduces exhaust noise, improves the exhaust power, prevents the exhaust gas from stagnating inside the engine, thereby enhancing the overall engine output. In addition, I have.

1 is a sectional view of a conventional muffler;
2 is a cross-sectional view of a muffler of the present invention.
3 is a cross-sectional view of the vortex forming part of the present invention.
4 is a cross-sectional view of the laminar flow forming portion of the present invention.
5 is an enlarged sectional view of the outer wall of the housing of the present invention.
6 is an enlarged cross-sectional view of an impact shock attenuator according to the present invention.
7 is a front view and a partially enlarged cross-sectional view of the vibration damping portion of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, the size, line thickness, and the like of the components shown in the drawings to be referred to for describing the present invention may be exaggerated somewhat for convenience of understanding.

The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the entire contents of this specification.

Also, in this application, the terms " comprises, " " having ", and the like refer to the presence of a particular number, step, operation, component, But do not preclude the presence or addition of a feature, a number, a step, an operation, an element, a component, or a combination thereof.

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely.

Therefore, it is intended that the present invention covers the modifications and variations of this form, and that the embodiments herein be described in detail in the specification. It is to be understood, however, that the appended claims are intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention, and that the singular forms " Includes plural representation unless expressly stated otherwise.

In the following description, well-known functions or constructions are not described in order to obscure the subject matter of the present invention

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

Fig. 2 is a cross-sectional view of the muffler according to the present invention, Fig. 3 is a transverse sectional view of the vortex forming part of the present invention, Fig. 4 is a transverse sectional view of the laminar flow forming part of the present invention, to be.

The muffler 200 of the present invention is roughly divided into an exhaust pipe 210, a housing 220, a sound damper 230, and an impact damper 240.

The exhaust pipe 210 has a vortex generating portion 211 on the side where exhaust gas is introduced and a laminar flow generating portion 212 on the side where the exhaust gas is discharged. And a linear vane 212a protrudes from the inner surface of the laminar flow generating portion 212. The laminar flow generating portion 211 has a laminar flow generating portion 211 and a laminar flow generating portion 212, (Not shown).

The vortex generating unit 211 increases the flow rate of the exhaust gas generated from the engine to the outside to improve the exhaust power and prevents the generated exhaust gas from stagnating inside the engine, It has the ability to increase,

The laminar flow generating portion 212 is configured to receive the exhaust pressure toward the inner wall of the exhaust pipe 210 when the vortex generating portion 211 finishes the rotation of the exhaust gas flow at the end portion thereof, The direction of the exhaust gas is changed linearly by the provided straight wing 212a to disperse the exhaust pressure acting on the inner wall of the exhaust pipe 210 from the vortex generating unit 211, And to reduce the noise and smooth exhaust of the exhaust gas

The through hole 213 serves to dissipate noise generated as the flow rate increases at the end of the vortex generation section 211 to the interior of the housing 220 to cancel the noise.

That is, the feature of this embodiment resides in the straight blade 212a provided on the inner surface of the laminar flow generating portion 212, which is a structure capable of quickly converting vortex into laminar flow.

The housing 220 has a hollow cylindrical structure and through holes through which the exhaust pipe 210 penetrates are formed at both sides of the housing 220 so that the exhaust pipe 210 is fitted and coupled. (230) is filled to attenuate the noise.

A body of the housing 220 has a double pipe structure having a hollow portion 224 formed by an outer wall 220a and an inner wall 220b and a sound insulating plate 221 is formed in the hollow portion 224 . (See Fig. 5)

The sound-absorbing plate 221 has a truss structure. The unit cavity 221a formed by the sound-absorbing plate of the truss structure reflects the incident sound wave generated from the noise source to the sound-absorbing plate 221, Resonance to attenuate it, so that the sound insulation performance is improved.

A spring 223 is mounted on the upper and lower surfaces of the unit cavity 221a to further reduce vibrations and noise applied to the housing 220.

In addition, since the sound insulating plate 221 is formed in the shape of a partition wall constituted by a triangular unit space of a truss structure, the sound insulating plate 221 having a triangular structure can not easily be deformed due to impact or vibration, The housing 220 can be formed as a double tube having inner and outer walls so that the weight of the housing 220 can be reduced while the overall weight of the housing 220 can be reduced and high strength can be maintained.

Since the sound damper 230 has a structure in which the aramid fiber and the glass fiber are woven together, the structure of the ventilation hole through which the exhaust gas can pass can be maintained and heat resistance can be obtained by the exhaust pressure generated from the muffler, And also has the function of maintaining the effect of sound insulation and sound absorption.

6, the impact damper 240 has a cylindrical structure and is fixed in communication with the vent hole 220c provided on the outer surface of the housing 220, It acts to attenuate the impact.

The impact damper 240 is divided into a case 241, a partition plate 242, a first expansion plate 243 and a second expansion plate 244.

The case 241 has a cylindrical structure and communicates with the vent hole 220c formed on the outer surface of the housing 220 so that the exhaust gas can be introduced through the vent hole 220c, And a hole 241a is formed to communicate with the outside air.

The partition plate 242 is divided into a first and a second fluid pressure chamber S1 and a second fluid pressure chamber S2 which will be described later and divides the case 241 upward and downward and a channel 242a is formed at the center, The fluid can be moved between the first hydraulic chamber S1 and the second hydraulic chamber S2.

The first expansion plate 243 is made of a material capable of expanding and contracting due to elasticity and restoring force and is fixed to the inner wall on the lower side of the case 241 to form a first hydraulic pressure chamber S1.

The second expansion plate 244 is made of a material capable of expanding and contracting due to elasticity and restoring force and is fixed to the inner wall on the upper side of the case 241 to form the second fluid pressure chamber S2.

When the accelerator pedal is depressed in order to rapidly accelerate the vehicle, the exhaust power and the exhaust amount of the exhaust gas are instantaneously increased. As the exhaust amount is increased, The exhaust gas rapidly flows into the housing from the through holes 213 of the exhaust pipe 210 formed therein to generate noise and vibration. In this embodiment, the exhaust gas rapidly flows into the case through the vent hole 220c, The fluid in the first fluid pressure chamber S1 flows through the fluid path 242a into the second fluid pressure chamber 241 through the second fluid pressure chamber 241. When the inflowing exhaust gas pressurizes and expands the first expansion plate 243, S2, and inflates the second expansion plate 244. As shown in Fig.

Since the first expansion plate 243 expands in conjunction with the pressure of the exhaust gas thus rapidly flowing, the fluid moves from the first fluid pressure chamber S1 to the second fluid pressure chamber S2 through the flow path 242a Since the impact and noise are attenuated by the fluid resistance, noise and vibration of the muffler are minimized by the acceleration of the sudden vehicle.

Hereinafter, the vibration damping unit according to the second embodiment of the present invention will be described.

7 is a front view and a partially enlarged cross-sectional view of the vibration damping portion of the present invention.

As shown in the figure, the vibration damping unit 250 is provided between the body B of the vehicle and the muffler 200, and serves to damp vibration, noise due to running of the vehicle, vibration due to exhaust gas, and noise.

The vibration damping part 250 is divided into a case 251, a moving plate 252, a supporting plate 253, an elastic body 254 and a buffer space 255.

The case 251 is made of a metal or a high strength plastic material, and has a hollow cylindrical or rectangular box shape, and one side thereof is fixed to the housing 220 of the muffler. The moving plate 252 fixed to the body B serving as a vehicle body is fitted and inserted into a through hole formed in the upper surface of the case 251 so as to be slidable.

The moving plate 252 is fixed to the body B as a vehicle body and a groove is formed on the outer surface of the moving plate 252. A seal ring 252a is inserted into the groove, Thereby keeping the inner surface of the sealing member 251 in a sealed state.

Further, a groove is formed in the bottom surface of the moving plate 252, and an elastic body 254 to be described later is engaged.

The support plate 253 is protruded to the inside of the case 251 and forms a buffer space 255 to be described later. The support plate 253 has a micropore 253a formed at the center of the support plate 253, A groove is formed on the upper surface, and an elastic body 254 to be described later is engaged.

The elastic member 254 is coupled between a groove formed on the bottom surface of the moving plate 242 and a groove formed on the upper surface of the supporting plate 243 to elastically support the moving plate 242.

The buffer space 245 is a space formed by a support plate 253 that divides the case 251 upward and downward, and a through hole 251a is formed on the outer surface thereof.

As to the operation of the vibration damping unit 250,

A slight vibration due to the road surface or engine exhaust is transmitted to the moving plate 252 while the moving plate 252 is supported by the elastic body 254 so that the elastic body 254 is elastically deformed and restored, Lt; / RTI >

This slight vibration causes the elastic restoring force of the elastic body 254 to attenuate.

The vibration of the vehicle due to the sudden braking or rapid acceleration causes the moving plate 252 to descend and compress the air. The compressed air is discharged through the fine holes 253a provided in the support plate 253, The fluid is discharged through the through hole 251a formed in the outer surface of the buffer space 255. Therefore, when the air is compressed and discharged into the fine holes 253a, the buffer spaces 255 and the through holes 251a, So that vibration and noise of the vehicle can be minimized.

INDUSTRIAL APPLICABILITY As described above, the present invention significantly reduces exhaust noise, improves exhaust power, prevents the exhaust gas from stagnating inside the engine, thereby enhancing the overall engine output and attenuating vibration of the muffler.

200: muffler 210: exhaust pipe
211: vortex generating part 211a:
212: a laminar flow generating section 212a: a straight blade
220: housing 220a: outer wall
220b: inner wall 220c:
221: sound insulating plate 221a: unit cavity portion
222: protruding rod 223: spring
224: hollow part 230: sound absorbing material
240: Impact damping part 241: Case
241a: communication hole 242: partition plate
242a: a flow path 242a: a flow path
243: first expansion plate 244: second expansion plate
250: vibration damping unit 251: case
251a: through hole 252: moving plate
252a: seal ring 253:
253a: fine hole 254: elastic body
255: Buffer space B: Body
S1: first hydraulic chamber S2: second hydraulic chamber

Claims (3)

A laminar flow generation section 212 formed on the side from which the exhaust gas is discharged and a laminar flow generation section 212 formed between the vortex generation section 211 and the laminar flow generation section 212 );
A spiral blade 211a is protruded on the inner surface of the vortex generating part 211 and an exhaust pipe 210 having a straight vane 212a protruded on the inner surface of the laminar flow generating part 212,
And a hollow portion 224 formed by the outer wall 220a and the inner wall 220b is provided on both sides of the hollow pipe 224. The hollow pipe 224 has a hollow portion through which the exhaust pipe 210 passes, A housing 220 having a structure of a double tube,
And a shock absorber (240) having a cylindrical structure and fixed to the vent hole (220c) provided on the outer surface of the housing (220c) to attenuate a sudden impact. The method according to claim 1,
The housing 220 is formed with a sound insulating plate 221 on a hollow portion 224 formed by the outer wall 220a and the inner wall 220b;
The sound insulating plate 221 is a truss structure that resonates and attenuates incident sound waves to form a unit cavity 221a in which a lightweight and high strength is maintained. A spring 223 is provided on the upper and lower surfaces inside the unit cavity 221a And the vibration and noise are attenuated. The method according to claim 2,
The impact damping unit 240,
A case 241 having a cylindrical structure and communicating with a vent hole 220c formed on an outer surface of the housing 220 and having a communication hole 241a formed in an upper portion thereof,
A partition plate 242 partitioning the case 241 upward and downward, a passage 242a formed at the center thereof,
A first expansion plate 243 made of an elastic material capable of expanding and contracting and fixed to the inner wall on the lower side of the case 241 to form a first hydraulic pressure chamber S1,
And a second expansion plate (244) made of an elastic material capable of expanding and contracting and being fixed to an inner wall on the upper side of the case (241) to form a second fluid pressure chamber (S2). The muffler .

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