KR910007632B1

KR910007632B1 - Muffler for automobile

Info

Publication number: KR910007632B1
Application number: KR1019890001880A
Authority: KR
Inventors: 박광수; 김명렬
Original assignee: 현대자동차 주식회사; 이양섭; 세종공업 주식회사; 박세종
Priority date: 1989-02-17
Filing date: 1989-02-17
Publication date: 1991-09-28
Also published as: KR900013179A

Abstract

The muffler with low back-pressure and in connection with the exhaust system, improves the engine performance. The muffler (3) comprises first resonance chamber (5), expansion chamber (6), second resonance chamber (7), third resonance chamber (8), which are divided by partitions (4),(4'),(4"); parallel exhaust pipes (9) ,(9') at the partitions (4'),(4"), and connection with outlet pipes (10),(10'); U-shaped exhaust pipe (11), for generating low back pressure, connected with the outer inlet pipe (12). The lengths of side branches (l1),(l2) elongated from respective exhaust pipes (9),(9') and U-shaped pipe (11) in expansion chamber (6), have a quarter of sound frequency.

Description

Automotive Silencer

제1도는 본 발명의 일부를 절결한 사시도.1 is a perspective view of a part of the present invention cut out.

제2도는 본 발명의 종단면 구성도.2 is a longitudinal cross-sectional view of the present invention.

제3도는 본 발명의 실시 상태도.3 is an exemplary embodiment of the present invention.

제4도는 종래 소음장치의 종단면 구성도.4 is a longitudinal cross-sectional view of a conventional silencer.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

3 : 소음기 4, 4', 4" : 칸막이(BAFFLE)3: Silencer 4, 4 ', 4 ": Partition

5 : 제1공명실 6 : 팽창실5: first resonance chamber 6: expansion chamber

7 : 제2공명실 8 : 제3공명실7: 2nd resonance room 8: 3rd resonance room

9, 9" : 배기파이프 11 : U자형 배기파이프9, 9 ": exhaust pipe 11: U-shaped exhaust pipe

본 발명은 각종 자동차의 배기라인 후미에 연결 설치하여 사용하는 소음장치에 관한 것으로, 특히 저배압으로 엔진출력을 향상되게 한 자동차용 소음장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a silencer for use in connection to the exhaust line of various automobiles, and more particularly to a vehicle silencer for improving engine output at low back pressure.

일반적으로, 자동차 엔진 내부에서 연소된 배기가스는 배기밸브와 배기라인을 통해서 대기중으로 방출되는데, 그 속도가 거의 음속에 가깝고 고압이기 때문에 바로 대기중으로 방출시 급격히 팽창하면서 격렬한 폭발음을 발생시키게 된다.In general, exhaust gas combusted inside an automobile engine is released into the atmosphere through an exhaust valve and an exhaust line. Since the velocity is almost near the speed of sound and high pressure, the exhaust gas rapidly expands and generates a violent explosion sound when released into the atmosphere.

따라서 엔진내부에서 연소한 배기가스를 배기라인을 통해 외부로 방출시킬 때 발생하는 폭발음을 감소시키기 위한 수단으로 소음기를 설치하는 것이다.Therefore, the silencer is installed as a means for reducing the explosion sound generated when the exhaust gas combusted in the engine is discharged to the outside through the exhaust line.

종래의 소음기는 도면 제4도에서 보는 바와 같이, 엔진의 폭발음을 발생케하는 배기가스가 배기관(a)으로 들어와서 팽창실(K)에서 음압이 팽창되고, 이는 다시 배기 유도관(b),(c)을 통하여 팽창실(l),(j)에서 팽창한 후, 배기출구관(d)을 통하여 배기가스와 소음이 대기로 방출되는 것이다.The conventional silencer, as shown in Figure 4, the exhaust gas for generating the explosion sound of the engine enters the exhaust pipe (a) and expands the sound pressure in the expansion chamber (K), which in turn exhaust exhaust pipe (b), After expansion in the expansion chambers (l) and (j) through (c), exhaust gas and noise are discharged to the atmosphere through the exhaust outlet pipe (d).

그러나, 이와 같은 소음장치는 배기가스의 원활한 흐름을 방해하여 음에너지를 마찰 또는 열에너지로 변환시켜 소음을 저감되게 한 것이므로, 배기가스의 흐름이 당연히 원활하지 못하였고, 이로인해 배기압력이 높아지게 되면 상대적으로 엔진출력은 저하되는 등의 문제점이 발생하는 것이었다.However, since the silencer prevents the smooth flow of the exhaust gas and converts the sound energy into friction or heat energy to reduce the noise, the flow of the exhaust gas is naturally not smooth, and when the exhaust pressure is high, As a result, problems such as deterioration of the engine output occurred.

본 발명은 소음장치에 관하여 상기와 같은 문제점을 해결하려는 것으로서, 저배압을 위해 U자형 파이프를 설치하여 배기가스의 원활한 흐름을 유도하였으며, 그 상부에는 배기파이프 2개를 나란히 설치하여 기류소음(Flow noise) 저감 및 저배압을 유도시킴으로서 엔진의 출력증대를 꾀할 수 있도록 함에 그 목적이 있는 것이다.The present invention is to solve the problems described above with respect to the silencer, to install a U-shaped pipe for low back pressure to induce a smooth flow of the exhaust gas, the upper side of the exhaust pipe by installing two exhaust pipes (Flow The purpose is to increase the engine output by inducing noise reduction and low back pressure.

이하, 본 발명을 첨부도면과 관련한 일실시예에 따라 상세히 설명하면 다음과 같다.Hereinafter, described in detail according to an embodiment of the present invention with reference to the accompanying drawings.

제1도는 본 고안의 일부절결사시도로서, 자동차(1)엔진내부에서 연소된 배기가스를 대기중으로 방출시키는 배기라인(2)상에 설치된 소음기(3)에 있어서, 소음기(3) 내면에 칸막이(4),(4'),(4")를 설치하여 제1공명실(5), 팽창실(6), 제2공명실(7), 제3공명실(8)순으로 구획되게 하고, 칸막이(4),(4")에는 배기파이프(9),(9")를 나란히 설치하여 그 일단을 팽창실(6)에 도출되도록 옆분지관(SIDE BRANCH)(ι₂)이 형성되게 하고, 타단은 소음기(3)외부로 도출시켜 출구관(10),(10')이 되게 하며, 그 직하도는 다시 U자형 배기파이프(11)를 설치하되, 일단을 팽창실(6)에 도출시켜 옆분지관(SIDE BRANCH)(ι₂)이 형성되게 하고, 타단은 소음기(3)외부로 도출시켜 입구관(12)이 되게 구성한 것이다.1 is a partial cutaway perspective view of the present invention, in the silencer (3) installed on the exhaust line (2) for releasing the exhaust gas burned in the engine (1) inside the atmosphere, the partition on the inner surface of the silencer (3) (4), (4 '), (4 ") are installed so that they are partitioned in order of first resonance chamber (5), expansion chamber (6), second resonance chamber (7), and third resonance chamber (8). In the partitions 4 and 4 ", exhaust pipes 9 and 9" are installed side by side to form side branch pipes ι ₂ so that one end thereof is led to the expansion chamber 6, , The other end is drawn out to the outside of the silencer (3) to be the outlet pipe (10), (10 '), the straightness of the U-shaped exhaust pipe 11 is installed again, one end is led to the expansion chamber (6) Side branch pipe (SIDE BRANCH) (ι ₂ ) is formed, the other end is configured to be drawn out the silencer (3) to the inlet pipe (12).

도면중 미설명부호 13은 공명홀(Resonace hole)을 도시한 것이다.Reference numeral 13 in the drawings shows a resonance hole (Resonace hole).

이와같이 구성된 본 발명은 자동차(1)엔진의 폭발음과 연소된 배기가스가 소음기(3)내에 설치된 U자형 배기파이프(11)의 입구관(12)을 통하여 들어오게 되면, 팽창실(6)에서 확장된 후, 다시 배기 파이프(9)(9')를 통하여 출구관(10)(10')으로 나가 대기중으로 방출되어지는 것이다.The present invention configured as described above expands in the expansion chamber 6 when the explosion sound of the engine of the automobile 1 and the combusted exhaust gas enter through the inlet pipe 12 of the U-shaped exhaust pipe 11 installed in the silencer 3. After that, it exits through the exhaust pipes 9 and 9 'to the outlet pipes 10 and 10' and is released into the atmosphere.

이를 좀더 구체적으로 설명하면, U자형 배기파이프(11)에서 나온 엔진폭발음은 팽창실(6)에서 확장되어 1차적으로 에너지가 감소되고, 다시 제1공명실(5)과 공명홀(13)이 형성된 제2공명실(7), 제3공명실(8)에서 문제가 되는 주파수(저주파수)를 감쇄시키게 되는데, 이때 공명주파수 f는 다음과 같은 계산식에 의해서 성립되어지는 것으로, 즉,

인데, 여기서 c : 음속, n : 경부갯수, Sp : 경부단면적, v : 공명실의 체적, ιp : 공명관의 유효길이(=ι+βα or t+βα), ι : 공명관 길이, t : 경부두께, a : 공명관반경, β : 1.6 또는

또는

로 표시되는바, 이는 주로 저주파수를 감쇄시키기 위한 것이며, 또한 U자형 배기파이프(11)가 팽창실(6)에 도출되는 옆분지관(SIDE BRANCE)(ι₁)과 배기파이프(9),(9')가 팽창실(6)에 도출되는 옆분지관(SIDE BRANCE)(ι₂)는 다음과 같은 계산식에 의해 성립되어지는 것으로,In more detail, the engine explosion sound emitted from the U-shaped exhaust pipe 11 is expanded in the expansion chamber 6 to primarily reduce energy, and again the first resonance chamber 5 and the resonance hole 13 Attenuated frequencies (low frequencies) in the second resonance chamber 7 and the third resonance chamber 8 formed are reduced, where the resonance frequency f is established by the following equation, that is,

Where c is the speed of sound, n is the number of necks, Sp is the area of the neck, v is the volume of the resonance chamber, ιp is the effective length of the resonance tube (= ι + βα or t + βα), ι is the length of the neck, and , a: resonance radius, β: 1.6 or

or

This is mainly to attenuate the low frequency, and also the side branch pipe (SIDE BRANCE) (ι ₁ ) and the exhaust pipe (9), (9) from which the U-shaped exhaust pipe (11) is led to the expansion chamber (6). SIDE BRANCE (ι ₂ ), where ') is derived from the expansion chamber 6, is established by the following equation,

여기서 ι : 옆분지관(SIDE BRANCE)길이, π : 문제주파수의 파장으로 표시되는바, 이는 소음감소를 극대화시키기 위한 것이다.Where ι is the length of the side branch, π is the wavelength of the problem frequency, and this is to maximize noise reduction.

이상과 같은 본 발명은 옆분지관(SIDE BRANCE)(ι₁)(ι₂)를 주파수의 파장에 따라 적절히 배치하였으므로, 소음을 효과적으로 감쇄되게 하였으며, 소음기 내면에 팽창실 및 다수의 공명실을 형성하여 엔진폭 발음을 적절히 감소되게 하고, 특히 저배압을 위해서 U자형 배기파이프를 설치하여 배기가스의 원활한 흐름을 유도시키되, 2개의 배기출구관으로 방출시키므로서 기류소음 저감 및 저배압이 이루어지게하여 엔진의 출력증대를 꾀하게 되는 등의 효과가 있는 매우 유용한 발명인 것이다.In the present invention as described above, since the side branch pipe (SIDE BRANCE) (ι ₁ ) (ι ₂ ) is properly disposed according to the wavelength of the frequency, the noise is effectively attenuated, and an expansion chamber and a plurality of resonance chambers are formed on the inner surface of the silencer. In order to reduce the engine sounding properly, install a U-shaped exhaust pipe for low back pressure, and induce a smooth flow of the exhaust gas, and discharge it to two exhaust outlet pipes to reduce the airflow noise and low back pressure It is a very useful invention that has the effect of increasing the output of the.

Claims

Partitions 4, 4 ', and 4 "are provided on the inner surface of the silencer 3 so that the first resonance chamber 5, the expansion chamber 6, the second resonance chamber 7, and the third resonance chamber ( 8) and the exhaust pipes 9 and 9 'are installed side by side in the partitions 4' and 4 "so that the outlet pipes 10 and 10 'are provided outside the silencer 3. And a U-shaped exhaust pipe (11) directly underneath it to draw the other end to the outside of the silencer (3) to form an inlet pipe (12).

A side branch pipe (ι ₂ ) according to claim 1, wherein one end of the exhaust pipes (9) and (9 ') provided in the partitions (4') and (4 ") is led out to the expansion chamber (6). And draw one end of the U-shaped exhaust pipe 11 directly below the expansion chamber 6 to be a side branch pipe ι ₁ , but the side branch pipe ι ₁ . Vehicle silencer, characterized in that (ι ₂ ) is configured to be 1/4 of the frequency.