KR100993710B1 - a muffler for a vehicle - Google Patents

Abstract

The present invention relates to a car main silencer that can realize a sporty sound while optimizing the position of the baffle and the position of the resonance chamber, while increasing the initial oscillation booming and reducing the oscillation booming at constant speed,

Conventional automotive main silencers were only concerned with lowering low frequency and high frequency airflow by simply changing pipe paths, and increasing back pressure to reduce idle and low frequency booming. There was a problem that caused adverse effects,

A main body; Four baffles spaced apart from the inside of the main body; Five chambers provided at the front and the rear of each baffle; An inlet pipe installed at an upper portion of one side of the main body; A first outlet pipe and a second outlet pipe respectively installed at one lower side and the other center of the main body; The intermediate pipe is installed on the same horizontal line as the inlet pipe and has one end located in the first chamber and the other end passing through the second chamber located in the third chamber. The chamber achieves sporty sound characterized by an intermediate pipe acting as a neck and acting as a Helmholtz resonator, while reducing back pressure to increase engine power, increasing initial oscillation booming, and Interval oscillation booming can be reduced, resulting in cost savings through simplified structure, reduced capacity, and elimination of double tubes.

Main Silencer, Sporty Sound, Chamber, Inlet Pipe, Outlet Pipe, Middle Pipe, Baffle, Punching Hole, Glass Wool

Description

Automotive muffler {a muffler for a vehicle}

The present invention relates to a main silencer for automobiles, and more particularly, to optimize the position of the baffle, the position of the resonance chamber, and the like to achieve sporty sound while increasing initial oscillation booming and reducing oscillation booming at constant speed.

In general, the main car silencer of the prior art was interested only in lowering the low frequency and high frequency airflow by simply changing the pipe path, and increasing the back pressure to reduce the idle and the low frequency booming. There was a problem that causes adverse effects such as.

Therefore, in the sports car, it is desirable to realize sporty sound instead of simply reducing noise.

The sporty sound in the above is subjective and needs to be objective, and the sound table must be cleared to make the sporty tone clear for objectification.

1 and 2 are graphs for establishing a target sound of a sports car model based on the result of listening evaluation.

As shown in Fig. 1 and Fig. 2, the sound propelled in the vehicle model related to the present invention is made to increase the oscillation booming (˜3,000 RPM) to about 100 dBC, and the propulsion below 3,000 RPM is promoted to 100 dBC or less.

3 is a block diagram of a main silencer capable of implementing sporty sound.

The main silencer shown in FIG. 3 is configured to reduce engine noise while canceling along various flow paths through a plurality of baffles and pipes.

In general, sporty sound has a large booming, so it is disadvantageous to external noise, and a double tube is added to the outer tube to improve the noise.

In addition, in order to reduce cost recently, it is necessary to minimize the main silencer capacity as long as it satisfies the vibration / noise (NVH) and the back pressure.

The present invention has been made in view of the above-described conventional situation, and the object thereof is to increase the engine output by reducing the back pressure and increasing the initial oscillation booming and reducing the constant speed oscillation booming. It is to provide a silencer.

Car main silencer of the present invention for achieving the above object; Four baffles spaced apart from the inside of the main body; Five chambers provided at the front and the rear of each baffle; An inlet pipe installed at an upper portion of one side of the main body; A first outlet pipe and a second outlet pipe respectively installed at one lower side and the other center of the main body; The intermediate pipe is installed on the same horizontal line as the inlet pipe and has one end located in the first chamber and the other end passing through the second chamber located in the third chamber.

In the present invention, the inlet end of the inlet pipe, the inlet end of the first outlet pipe, the inlet end of the second outlet pipe, and one end of the intermediate pipe are located in the third chamber in the center of the main body, and one end of the intermediate pipe is located. The first chamber serves as a Helmholtz resonator with an intermediate pipe acting as a neck.

The glass chamber is filled in the second chamber through which the second outlet pipe and the intermediate pipe pass, and the fifth chamber through which the inlet pipe and the first outlet pipe pass, respectively, and the passage through the fifth chamber and the second outlet of the first outlet pipe. Perforations are provided in the second chamber passage portion of the pipe.

According to the present invention, it is possible to increase the engine power (for example, 4 to 5 PS) by reducing the back pressure (for example, reducing about 10 KPa) while implementing sporty sound.

In addition, the initial oscillation boom can be increased, the constant speed oscillation boom can be reduced, and the cost reduction can be realized by simplifying the structure, reducing the capacity, and eliminating the double tube.

Hereinafter, the specific technical details of the present invention will be described in more detail with reference to the accompanying drawings.

4 is a block diagram of an embodiment of the present invention.

Automotive main silencer 100 of the present invention and the main body 10; Four baffles (21) (22) (23) (24) spaced apart from the inside of the main body (10); Five chambers (31) (32) (33) (34) (35) provided in front of and behind the respective baffles (21) (22) (23) (24); An inlet pipe 40 installed on one side of the main body 10; A first outlet pipe 51 and a second outlet pipe 52 respectively installed at one lower side and the other center of the main body 10; The intermediate pipe 70 is installed on the same horizontal line as the inlet pipe 40 and has one end located in the first chamber 31 and the other end passing through the second chamber 32 located in the third chamber 33. Consists of;

In the present invention, the outlet end portion of the inlet pipe 40 and the inlet end portion of the first outlet pipe 51, which are installed at one upper part and one lower part of the main body 10, and the second outlet provided at the other center of the main body 10. The inlet end of the pipe 52 and one end of the intermediate pipe 70 installed in the second chamber 32 are both located in the third chamber 33 in the center of the main body 10, and the inlet pipe 40 The exhaust gas flowing out of the furnace outlet end flows in the outlet pipes 41 and 42 after being expanded in the third chamber 33.

Therefore, in the main silencer 100 of the vehicle of the present invention, it is possible to expect the effect of increasing the oscillation booming and reducing the back pressure by simplifying the exhaust gas discharge path. (For example, increasing the initial oscillation booming 10dBC and reducing the back pressure 10KPa)

In the present invention, the first chamber 31 in which one end of the intermediate pipe 70 is positioned serves as a Helmholtz resonator with the intermediate pipe 70 serving as a neck, which is a constant engine speed section (for example, at constant speed driving). Boomering in the 2000 ~ 3000RPM section is reduced. (Prevention of excessive boomering when driving for a long time in the constant speed section of the highway, etc.)

In the present invention, the second chamber 32 through which the second outlet pipe 52 and the intermediate pipe 70 pass, and the fifth chamber 35 through which the inlet pipe 40 and the first outlet pipe 51 pass. The glass wool 60 (G / WOOL) is filled, respectively, and the perforations 51a and 52a are respectively provided in the fifth chamber passage portion of the first outlet pipe 51 and the second chamber passage portion of the second outlet pipe 52, respectively. ), It is possible to reduce the high frequency and increase the exhaust discharge sound linearity.

In the present invention, the exhaust gas flowing into the third chamber 33 through the inlet pipe 40 is expanded and discharged to the outside through each of the outlet pipes 51 and 52.

In general, if the oscillating boom is too large when driving at a constant speed of a vehicle (for example, 80 to 100 km / h, 2000 to 3000 RPM), the driver may feel fatigue, so this section needs to reduce the booming. 40) Improving booming by making a resonance chamber using the intermediate pipe 70 on the opposite side.

Important matters above, in the path where the inlet pipe 40 extends to the third chamber 33 in the resonance chamber, the intermediate chamber 70 is installed in the same path as the path of the inlet pipe 40 so that the first chamber 31 can be used. It should be noted that a resonance chamber must exist, and the applicant of the present invention has confirmed through several experiments that there is no effect even if such a resonance chamber is placed on another path.

In the present invention, the perforated portions 51a and 52b are provided in the outlet pipes 51 and 52, respectively, and the second chamber 32 and the fifth chamber through which the outlet pipes 51 and 52 pass. 35 is filled with a glass wool (G / WOOL) to remove the high-frequency sound, thereby providing a booming bass rather than a light, unpleasant sound.

5 is a graph showing the noise level according to the engine speed of an embodiment of the present invention.

In the present invention, as shown in Fig. 5, the initial oscillation boom can be increased (for example, from 92dBC to 2,500 RPM based on 103dBC).

In addition, by reducing the oscillation booming in the constant speed driving section, it is possible to alleviate driver fatigue during the constant speed driving.

In addition, lower back pressure can increase the power output and reduce costs by simplifying the structure, reducing the capacity and eliminating double tubes.

6 shows a vehicle evaluation graph of the present invention.

In the present invention, as shown in Fig. 6, the intake air discharge sound increased by about 3 dB in the region of 3000 RPM or more after optimization, and the exhaust air discharge sound was close to 103 dB of the target TARGET.

The present invention described above is not limited to the above-described embodiments and drawings, and various permutations, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

1 and 2 are graphs for establishing a target sound of a sports car model based on a hearing evaluation result

3 is a configuration diagram of a main silencer capable of implementing sporty sound

4 is a block diagram of one embodiment of the present invention

5 is a graph showing the noise level according to the engine speed of an embodiment of the present invention

6 is a real vehicle evaluation graph of the present invention

<Explanation of Signs of Major Parts of Drawings>

100: main silencer

10: main body

21, 22, 23, 24: baffles

31, 32, 33, 34, 35: chamber

40: inlet pipe

51, 52: outlet pipe

51a, 52a: punching part

60 glass wool

70: middle pipe

Claims (4)

delete A main body; Four baffles spaced apart from the inside of the main body; Five chambers provided at the front and the rear of each baffle; An inlet pipe installed at an upper portion of one side of the main body; A first outlet pipe and a second outlet pipe respectively installed at one lower side and the other center of the main body; In the main silencer for automobiles, which is installed on the same horizontal line as the inlet pipe, one end is located in the first chamber and the other end passing through the second chamber is located in the third chamber. The inlet end of the inlet pipe, the inlet end of the first outlet pipe, the inlet end of the second outlet pipe, and one end of the intermediate pipe are located in the third chamber of the inner center of the main body, the first chamber of which one end of the intermediate pipe is located The main silencer for automobiles, characterized in that the middle pipe acts as a neck and serves as a Helmholtz resonator. 3. The main silencer for automobiles according to claim 2, wherein glass wool is filled in a second chamber through which the second outlet pipe and the intermediate pipe pass, and a fifth chamber through which the inlet pipe and the first outlet pipe pass. 4. The main silencer for automobile according to claim 3, wherein perforations are provided in the fifth chamber passage portion of the first outlet pipe and the second chamber passage portion of the second outlet pipe, respectively.

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