CN102392719A

CN102392719A - Automobile silencer

Info

Publication number: CN102392719A
Application number: CN2011103896671A
Authority: CN
Inventors: 赵文芳; 杜潇; 瞿尚胜; 陶忆
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2011-11-30
Filing date: 2011-11-30
Publication date: 2012-03-28

Abstract

The invention discloses an automobile silencer. A silencer chamber is composed of a front end cover, a shell and a back end cover and can be divided into front, middle and back chambers by a front partition plate and a back partition plate; an air suction pipe can be inserted from the front end cover, penetrates through the front chamber and the front partition plate and then enters the middle chamber; an inner air suction pipe penetrates through the middle chamber and the back chamber from the front chamber, is connected with an exhaust tail pipe and exports gas from the front chamber, thus the high-frequency noise of the engine can be eliminated by virtue of the long tail pipe effect.

Description

A kind of automotive muffler

Technical field

The present invention relates to automobile exhaust system, be specifically related to a kind of automotive muffler.

Background technique

Automotive muffler is a key components and parts that is used for reducing the automobile engine to exhaust noise, and it is to form expansion cavity, the isostructural reactive muffler of resonant cavity through cylindrical shell, dividing plate, end cap, perforated pipe, is arranged in after the back axle.Through adding the cotton dissipative muffler that forms of noise reduction, be arranged in before the back axle high frequency and low-frequency noise that dissipative muffler and reactive muffler are eliminated engine combustion respectively and produced.But under the bigger situation of motor import/exhaust mass flow rate, influenced by the automobile chassis spatial arrangement, dissipative muffler can not meet the demands separately, can't eliminate the automobile high-frequency noise fully, needs the auxiliary elimination of accomplishing high-frequency noise of other structure.

Summary of the invention

The present invention to solve just under the bigger situation of import/exhaust mass flow rate, the problem of high-frequency noise through at long breathing pipe of rear muffler set inside, forms the long-tail tube effect with tailpipe, helps to eliminate the high-frequency noise problem.

For solving the problems of the technologies described above, the present invention takes following technological scheme:

A kind of automotive muffler, it forms noise elimination cavity by front cover, housing and rear end cover, and three chambeies before, during and after by preceding dividing plate and rear bulkhead noise elimination cavity being separated into are evenly equipped with aperture on preceding dividing plate and the rear bulkhead; Suction tude inserts from front cover, passes ante-chamber and preceding dividing plate and gets into lumen, has aperture on the tube wall of that part of pipe of suction tude in ante-chamber and lumen; Said tailpipe picks out from back cavity, is filled with the noise reduction cotton in the back cavity; It is characterized in that: an interior steam outlet pipe passes lumen and back cavity backward from ante-chamber, is connected with tailpipe, derives gas from ante-chamber, eliminates the motor high-frequency noise through the long-tail tube effect; Have aperture on the tube wall of that part of pipe of steam outlet pipe in back cavity in said.

The silencing apparatus that adopts the present invention to propose, air-flow directly gets into second chamber from suction tude, and then flows to first chamber through the aperture on the dividing plate, arranges to atmosphere from the interior steam outlet pipe in first chamber.Because interior steam outlet pipe is worn to the 3rd chamber from first chamber, pipeline is longer, is connected with tailpipe in addition, forms the acoustic wave filter structure with long-tail tube effect, helps to eliminate the high-frequency noise problem.

Description of drawings

Fig. 1 is the structural representation of this silencing apparatus.

Among the figure, 1, the external admission pipe, 2, front cover, 3, housing, 4, preceding dividing plate, 5, interior steam outlet pipe, 6, rear bulkhead, 7, noise reduction is cotton, 8, rear end cover, 9, tailpipe, 10, interior suction tude.

Embodiment

Below in conjunction with accompanying drawing the present invention is described further:

Referring to Fig. 1, form noise elimination cavity by front cover 2, housing 3 and rear end cover 8, three chambeies before, during and after preceding dividing plate 4 is separated into noise elimination cavity with rear bulkhead 6 are evenly equipped with aperture on preceding dividing plate 4 and the rear bulkhead 6.

Suction tude inserts from front cover 2; Pass ante-chamber and preceding dividing plate 4 entering lumens; Suction tude is divided into external admission pipe 1 and 10 two sections of interior suction tude; External admission pipe 1 is fixed on silencing apparatus end cap 2 and the preceding dividing plate 4 with the mode of interior suction tude 10 through reducing and welding, has aperture on the tube wall of interior suction tude 10.

Interior steam outlet pipe 5 passes lumen and back cavity backward from ante-chamber, is connected with the tailpipe 9 in back cavity outlet port, has aperture on the tube wall of that part of pipe of interior steam outlet pipe 5 in back cavity.Interior steam outlet pipe 5 is fixed on the rear end cover 8 with the mode of tailpipe 9 through reducing and welding.

High back is low before the interior steam outlet pipe 5, is in tilted layout, and the bending of tail end L type becomes horizontal arrangement, and external admission pipe 1 is horizontal arrangement with 10 of interior suction tude, and in lumen, interior suction tude 10 is positioned at steam outlet pipe 5 belows.Layout more helps gas flow like this.

Noise reduction cotton 7 modes through filling are placed in rear bulkhead 6 and the rear end cover 8 formed cavitys.

In the suction tude 10, in the cavity that preceding dividing plate 4 and rear bulkhead 6 form, amplify then in engine exhaust is entered into by external admission pipe 1, form expansion cavity, be used for the spent gas energy and reduce noise; Small part of gas penetrates in the noise reduction cotton 7 through the aperture on the rear bulkhead 6, and when sound wave passed through these materials, acoustic energy was absorbed by porous material and is transformed into heat energy, thereby reduced noise; The overwhelming majority enters between the ante-chamber that is formed by front cover 2 and preceding dividing plate 4 through the aperture on the preceding dividing plate 4, forms countless expansion cavities, reduces gas noise once more; All gas imports in the atmosphere through interior steam outlet pipe 5 tailpipe 9 of flowing through again at last then, eliminates the engine exhaust energy once more through the long-tail tube effect, finally successfully eliminates engine noise.

Claims

1. automotive muffler, it forms noise elimination cavity by front cover (2), housing (3) and rear end cover (8), three chambeies before, during and after by preceding dividing plate (4) and rear bulkhead (6) noise elimination cavity being separated into, preceding dividing plate and rear bulkhead are evenly equipped with aperture; Suction tude inserts from front cover, passes ante-chamber and preceding dividing plate and gets into lumen, has aperture on the tube wall of that part of pipe of suction tude in ante-chamber and lumen; Said tailpipe (9) picks out from back cavity, is filled with noise reduction cotton (7) in the back cavity;

It is characterized in that: an interior steam outlet pipe (5) passes lumen and back cavity backward from ante-chamber, is connected with tailpipe, derives gas from ante-chamber, eliminates the motor high-frequency noise through the long-tail tube effect; Have aperture on the tube wall of that part of pipe of steam outlet pipe in back cavity in said.

2. automotive muffler according to claim 1 is characterized in that the preceding high back of said interior steam outlet pipe is low, is in tilted layout.

3. automotive muffler according to claim 2 is characterized in that the tail end L type bending of said interior steam outlet pipe, becomes horizontal arrangement.

4. according to claim 1,2 or 3 described automotive mufflers, it is characterized in that said suction tude is divided into (10) two sections of external admission pipe (1) and interior suction tude, external admission pipe and interior suction tude are fixed through the mode of reducing and welding at the front cover place.

5. according to claim 1,2 or 3 described automotive mufflers, it is characterized in that said suction tude is horizontal arrangement.

6. according to claim 1,2 or 3 described automotive mufflers, it is characterized in that in lumen that suction tude is positioned at the steam outlet pipe below.