CN203742711U - Automobile silencer - Google Patents
Automobile silencer Download PDFInfo
- Publication number
- CN203742711U CN203742711U CN201420121619.3U CN201420121619U CN203742711U CN 203742711 U CN203742711 U CN 203742711U CN 201420121619 U CN201420121619 U CN 201420121619U CN 203742711 U CN203742711 U CN 203742711U
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- Prior art keywords
- honeycomb duct
- noise reduction
- wing plate
- degree
- reduction chamber
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Abstract
The utility model discloses an automobile silencer. The automobile silencer comprises a rectangular silencing pot flat spread sheet. The rectangular silencing pot flat spread sheet is provided with a plurality of double-door-and-window-shaped holes. Each double-door-and-window-shaped hole comprises a rectangular sound hole formed in the silencing pot flat spread sheet. Each sound hole is provided with a cross beam. The axis of each cross beam and the connection line of the midpoints of the opposite edges of the corresponding sound hole coincide. The two sides of each cross beam are connected with a wing plate A and a wing plate B. Each sound hole is divided by the corresponding cross beam into two symmetrical through holes which are identical in area. An acute angle A is formed between each wing plate A and the silencing pot flat spread sheet. An acute angle B is formed between each wing plate B and the silencing pot flat spread sheet. The area of each wing plate A is equal to the area of the region, on the left side of the corresponding cross beam, of the corresponding sound hole. The area of each wing plate B is equal to the area of the region, on the right side of the corresponding cross beam, of the corresponding sound hole. The automobile silencer has the advantages of being simple in structure and high in anti-noise capacity.
Description
Technical field
The utility model relates to automotive silencing field, specifically: a kind of automotive muffler.
Background technique
Silencing pot end-cap assembly, as the significant components of automobile silencing, existing structure is mainly comprised of silencing pot and end cap, and wherein, silencing pot is provided with the circle of evenly arranging and crosses sound hole, and end cap is slab construction.Above-mentioned hush pipe is used in after the car of Alto, can attenuating noise, and when the original output noise of motor is 95 decibels, after the noise reduction after silencing pot end-cap assembly is processed, 73.58 decibels of its outputs, its noise is still larger.
Model utility content
Technical problem to be solved in the utility model is that a kind of automotive muffler that a kind of noise reduction value is large is set.
The technical scheme in the invention for solving the above technical problem is: a kind of automotive muffler, comprise the first noise reduction chamber connecting successively, the second noise reduction chamber, the 3rd noise reduction chamber, the termination of giving vent to anger, indoor second honeycomb duct that is provided with of the first silencing cavity, after extending into the second honeycomb duct by the first honeycomb duct, introduces the gas of eliminating the noise, the first noise reduction chamber is communicated with the second noise reduction chamber by the 3rd honeycomb duct, the second noise reduction chamber is communicated with the 3rd noise reduction chamber by the 4th honeycomb duct, the 3rd noise reduction chamber is communicated with external environment condition after running through by the 5th honeycomb duct the termination of giving vent to anger, the second honeycomb duct is the cylindrical shell that front-end and back-end are all sealed, and the second honeycomb duct is communicated with the first noise reduction chamber by being arranged on some air passing holes of self outer wall, one end that the 3rd honeycomb duct is positioned at the first noise reduction chamber is closed end, and one end that the 4th honeycomb duct and the 5th honeycomb duct are positioned at the 3rd noise reduction chamber is closed end,
The 5th honeycomb duct, the 4th honeycomb duct, equal open and flat of rectangular silencing pot after the 3rd honeycomb duct flattens, open and flat of silencing pot is provided with several two-door window openings, two-door window opening comprises the sound hole of crossing of the rectangle that is arranged on open and flat of silencing pot, cross sound hole and be provided with crossbeam, the axis of crossbeam overlaps with the line of crossing sound hole relative edge mid point, crossbeam both sides are connected with wing plate A and wing plate B, crossbeam is divided into homalographic and two symmetrical through holes by crossing sound hole, between open and flat of wing plate A and silencing pot, form acute angle A, between open and flat of wing plate B and silencing pot, form acute angle B, the area of wing plate A equals crossbeam left side and crosses sound hole region area, the area of wing plate B equals crossbeam right side and crosses sound hole region area,
The region that the 3rd honeycomb duct is provided with two-door window opening is M district, it is indoor that M district is positioned at the first silencing cavity, the region that the 4th honeycomb duct is provided with two-door window opening is N district, it is indoor that N district is positioned at the 3rd silencing cavity, the region that the 5th honeycomb duct is provided with two-door window opening is X district, it is indoor that X district is positioned at the 3rd silencing cavity, wherein the wing plate A of the 3rd honeycomb duct and wing plate B are positioned at the 3rd honeycomb duct pipe inner side, the wing plate A of the 5th honeycomb duct and wing plate B are positioned at the 5th honeycomb duct pipe inner side, and the wing plate A of the 4th honeycomb duct and wing plate B are positioned at the 4th honeycomb duct pipe inner side.
The circular noise-cancelling theory of crossing sound hole of tradition is: the structure of micropole diffusor is the straight tube of an endcapped, is drilled with a lot of apertures on tube wall.The principle of micropole diffusor is to take that the frequency spectrum of jet noise is foundation, if the gross area of maintenance spout is constant, with a lot of little spouts, replace, when the frequency spectrum of air-flow during through small holes, jet noise will be shifted to high frequency or ultra-high frequency, audible sound composition in frequency spectrum is obviously reduced, thereby reduce people's interference and injury.
Design of the present utility model is: change traditional circular hole into rectangular opening, utilize crossbeam to intercept into 2 symmetrical through holes by crossing sound hole, and utilize wing plate A and wing plate B to form sound wave obstruct break-in, between two adjacent mistake sound holes, from crossing the sound wave of sound hole outflow, under the leading role of wing plate A and wing plate B, to the adjacent sound hole direction of crossing, propagate, final mutual weakening, reaches the object of noise reduction.Under the same conditions, be that sound hole structure is different, the utility model is compared the sound hole of crossing of traditional round structure, and when the 5th honeycomb duct or the 4th honeycomb duct or the 3rd honeycomb duct are set separately, it is interval that noise reduction index of the present utility model can be controlled at 51.5-68.4 decibel.
Preferably, wing plate A and wing plate B are rectangle.
The angle of acute angle A equals 20 degree or 30 degree or 40 degree or 50 degree or 60 degree or 70 degree, and the angle of acute angle B equals 20 degree or 30 degree or 40 degree or 50 degree or 60 degree or 70 degree.
Through above-mentioned experiment, the utility model is preferred, and when the angle of acute angle A equals 30 degree, the angle of acute angle B equals 30 degree.
Preferably, the angle of acute angle A equals acute angle B.
Further, every three two-door window openings rearrange the two-door window opening group of row formula according to yi word pattern, three two-door window opening groups of row formula are not arranged and are formed the two-door window opening group of determinant according to row, the column direction of being expert at of the two-door window opening group of two row formulas separately flushes and arranges, and the two-door window opening group of row formula in the middle of being positioned at all misplaces and arranges with the two-door window opening group of row formula of both sides.
The indoor silencing board that is also provided with of the second silencing cavity, silencing board is between the 4th honeycomb duct and the 3rd honeycomb duct.
The axis angle of the axis of the 5th honeycomb duct and the 4th honeycomb duct is angle P, and span 20 degree of angle P are to 70 degree.
Through experiment, when the 5th honeycomb duct or the 4th honeycomb duct or the 3rd honeycomb duct are set separately, and when the angle of acute angle A equals 20 degree, the angle of acute angle B equals 20 while spending, noise reduction index of the present utility model can be controlled at 57.5 decibels, through experiment, when the angle of acute angle A equals 30 degree, the angle of acute angle B equals 30 while spending, noise reduction index of the present utility model can be controlled at 51.5 decibels, through experiment, when the angle of acute angle A equals 20 degree, the angle of acute angle B equals 20 while spending, noise reduction index of the present utility model can be controlled at 57 decibels, through experiment, when the angle of acute angle A equals 40 degree, the angle of acute angle B equals 40 while spending, noise reduction index of the present utility model can be controlled at 60.4 decibels, through experiment, when the angle of acute angle A equals 50 degree, the angle of acute angle B equals 50 while spending, noise reduction index of the present utility model can be controlled at 64 decibels, through experiment, when the angle of acute angle A equals 60 degree, the angle of acute angle B equals 60 while spending, noise reduction index of the present utility model can be controlled at 65.8 decibels, through experiment, when the angle of acute angle A equals 70 degree, the angle of acute angle B equals 70 while spending, noise reduction index of the present utility model can be controlled at 68.4 decibels.
Through experiment, after the 5th honeycomb duct, the first honeycomb duct, the second honeycomb duct, the first noise reduction chamber, the 3rd honeycomb duct, the second noise reduction chamber, silencing board, the 4th honeycomb duct, the 3rd noise reduction chamber, the termination of giving vent to anger are combined according to said structure, can export at 41.7-52.1 decibel interval by control noise.
To sum up, the beneficial effects of the utility model are: simple in structure, anti-noise ability is strong.
Accompanying drawing explanation
Fig. 1 is the front view for open and flat of silencing pot.
Fig. 2 is side planing figure of the present utility model.
Number in the figure is expressed as: 1, two-door window opening; 2, the two-door window opening group of row formula; 3, the two-door window opening group of determinant; 4, wing plate A; 5, wing plate B; 6, cross sound hole; 7, silencing pot is open and flat; 8, the 5th honeycomb duct; 81, the first honeycomb duct; 82, the second honeycomb duct; 83, the first noise reduction chamber; 84, the 3rd honeycomb duct; 85, the second noise reduction chamber; 86, silencing board; 87, the 4th honeycomb duct; 88, the 3rd noise reduction chamber; 89, the termination of giving vent to anger.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is done to detailed description further, but mode of execution of the present utility model is not limited to this.
Embodiment 1:
As Figure 1-Figure 2.
A kind of automotive muffler, comprise the first noise reduction chamber 83, the second noise reduction chamber 85, the 3rd noise reduction chamber 88, the termination 89 of giving vent to anger that connect successively, in the first noise reduction chamber 83, be provided with the second honeycomb duct 82, after extending into the second honeycomb duct 82 by the first honeycomb duct 81, introduces the gas of eliminating the noise, the first noise reduction chamber 83 is communicated with the second noise reduction chamber 85 by the 3rd honeycomb duct 84, the second noise reduction chamber 85 is communicated with the 3rd noise reduction chamber 88 by the 4th honeycomb duct 87, and the 3rd noise reduction chamber 88 is communicated with external environment condition after running through by the 5th honeycomb duct 8 termination 89 of giving vent to anger; The cylindrical shell that the second honeycomb duct 82 all seals for front-end and back-end, the second honeycomb duct 82 is communicated with the first noise reduction chamber 83 by being arranged on some air passing holes of self outer wall; One end that the 3rd honeycomb duct 84 is positioned at the first noise reduction chamber 83 is closed end, and one end that the 4th honeycomb duct 87 and the 5th honeycomb duct 8 are positioned at the 3rd noise reduction chamber 88 is closed end;
The 5th honeycomb duct 8, the 4th honeycomb duct 87, the 3rd honeycomb duct 84 equal open and flat 7 of rectangular silencing pots after flattening, open and flat of silencing pot is provided with several two-door window openings 1, what two-door window opening comprised the rectangle that is arranged on open and flat 7 of silencing pot crosses sound hole 6, cross sound hole 6 and be provided with crossbeam, the axis of crossbeam overlaps with the line of crossing sound hole 6 relative edge's mid points, crossbeam both sides are connected with wing plate A4 and wing plate B5, crossbeam is divided into homalographic and two symmetrical through holes by crossing sound hole 6, between open and flat of wing plate A4 and silencing pot, form acute angle A, between open and flat of wing plate B5 and silencing pot, form acute angle B, the area of wing plate A4 equals crossbeam left side and crosses sound hole 6 region areas, the area of wing plate B5 equals crossbeam right side and crosses sound hole 6 region areas.
The region that the 3rd honeycomb duct 84 is provided with two-door window opening 1 is M district, M district is positioned at the first noise reduction chamber 83, the region that the 4th honeycomb duct 87 is provided with two-door window opening 1 is N district, N district is positioned at the 3rd noise reduction chamber 88, the region that the 5th honeycomb duct 8 is provided with two-door window opening 1 is X district, X district is positioned at the 3rd noise reduction chamber 88, wherein the wing plate A4 of the 3rd honeycomb duct 84 and wing plate B5 are positioned at the 3rd honeycomb duct 84 pipe inner sides, the wing plate A4 of the 5th honeycomb duct 8 and wing plate B5 are positioned at the 5th honeycomb duct 8 pipe inner sides, the wing plate A4 of the 4th honeycomb duct 87 and wing plate B5 are positioned at the 4th honeycomb duct 87 pipe inner sides.
The noise reduction flow process of this enforcement is: gas to be eliminated the noise is input to the second honeycomb duct 82 from the first honeycomb duct 81, the cylindrical shell all sealing for front-end and back-end due to the second honeycomb duct 82, at the second honeycomb duct 82, drive for the first time and eliminate the noise and process, gas to be eliminated the noise flows to the first noise reduction chamber 83 from some air passing holes of the second honeycomb duct 82 self outer wall, wait the gas of eliminating the noise, pass through after air passing hole, sound wave is cancelled each other and is weakened, after the gas of eliminating the noise enters the first noise reduction chamber 83, after two-door window opening 1 by the 3rd honeycomb duct 84, enter the 3rd honeycomb duct 84, in dividing under effect of two-door window opening 1, the interior formation noise reduction of the 3rd honeycomb duct 84 is interval, gas to be eliminated the noise is in the interior further weakening of the 3rd honeycomb duct 84, gas to be eliminated the noise enters the second noise reduction chamber 85 by the 3rd honeycomb duct 84, at the second noise reduction chamber 85, cushion break-in, further carry out noise reduction processing, finally enter the 4th honeycomb duct 87, gas to be eliminated the noise flows to the 3rd noise reduction chamber 88 from the two-door window opening 1 of the 4th honeycomb duct 87, in the interior formation of the 3rd noise reduction chamber 88, eliminate the noise and process, gas to be eliminated the noise finally flows to the inner also discharge of the 5th honeycomb duct 8 by the two-door window opening of the 5th honeycomb duct 81 place, in the 5th honeycomb duct 8 due to the leading role of two-door window opening 1, gas to be eliminated the noise is further weakened.
The circular noise-cancelling theory of crossing sound hole of tradition is: the structure of micropole diffusor is the straight tube of an endcapped, is drilled with a lot of apertures on tube wall.The principle of micropole diffusor is to take that the frequency spectrum of jet noise is foundation, if the gross area of maintenance spout is constant, with a lot of little spouts, replace, when the frequency spectrum of air-flow during through small holes, jet noise will be shifted to high frequency or ultra-high frequency, audible sound composition in frequency spectrum is obviously reduced, thereby reduce people's interference and injury.
Design of the present utility model is: change traditional circular hole into rectangular opening, utilize crossbeam to intercept into 2 symmetrical through holes by crossing sound hole 6, and utilize wing plate A4 and wing plate B5 to form sound wave obstruct break-in, between two adjacent mistake sound holes 6, from crossing the sound wave of sound hole 6 outflows, under the leading role of wing plate A4 and wing plate B5, to the adjacent sound hole direction of crossing, propagate, final mutual weakening, reaches the object of noise reduction.Under the same conditions, be that sound hole structure is different, the utility model is compared the sound hole of crossing of traditional round structure, and when the 5th honeycomb duct 8 or the 4th honeycomb duct 87 or the 3rd honeycomb duct 84 are set separately, it is interval that noise reduction index of the present utility model can be controlled at 51.5-68.4 decibel.
Preferably, wing plate A4 and wing plate B5 are rectangle.
The angle of acute angle A equals 20 degree or 30 degree or 40 degree or 50 degree or 60 degree or 70 degree, and the angle of acute angle B equals 20 degree or 30 degree or 40 degree or 50 degree or 60 degree or 70 degree.
Through above-mentioned experiment, the utility model is preferred, and when the angle of acute angle A equals 30 degree, the angle of acute angle B equals 30 degree.
Preferably, the angle of acute angle A equals acute angle B.
Further, every three two-door window openings 1 rearrange the two-door window opening group 2 of row formula according to yi word pattern, three two-door window opening groups 2 of row formula are not arranged and are formed the two-door window opening group 3 of determinant according to row, the column direction of being expert at of the two-door window opening group 2 of two row formulas separately flushes and arranges, and the two-door window opening group 2 of row formula in the middle of being positioned at all misplaces and arranges with the two-door window opening group 2 of row formula of both sides.
Through experiment, when the 5th honeycomb duct 8 or the 4th honeycomb duct 87 or the 3rd honeycomb duct 84 are set separately, and when the angle of acute angle A equals 20 degree, the angle of acute angle B equals 20 while spending, noise reduction index of the present utility model can be controlled at 57.5 decibels, through experiment, when the angle of acute angle A equals 30 degree, the angle of acute angle B equals 30 while spending, noise reduction index of the present utility model can be controlled at 51.5 decibels, through experiment, when the angle of acute angle A equals 20 degree, the angle of acute angle B equals 20 while spending, noise reduction index of the present utility model can be controlled at 57 decibels, through experiment, when the angle of acute angle A equals 40 degree, the angle of acute angle B equals 40 while spending, noise reduction index of the present utility model can be controlled at 60.4 decibels, through experiment, when the angle of acute angle A equals 50 degree, the angle of acute angle B equals 50 while spending, noise reduction index of the present utility model can be controlled at 64 decibels, through experiment, when the angle of acute angle A equals 60 degree, the angle of acute angle B equals 60 while spending, noise reduction index of the present utility model can be controlled at 65.8 decibels, through experiment, when the angle of acute angle A equals 70 degree, the angle of acute angle B equals 70 while spending, noise reduction index of the present utility model can be controlled at 68.4 decibels.Through experiment, after the 5th honeycomb duct, the first honeycomb duct, the second honeycomb duct, the first noise reduction chamber, the 3rd honeycomb duct, the second noise reduction chamber, silencing board, the 4th honeycomb duct, the 3rd noise reduction chamber, the termination of giving vent to anger are combined according to said structure, can export at 41.7-52.1 decibel interval by control noise.
In the second noise reduction chamber 85, be also provided with silencing board 86, silencing board 86 is between the 4th honeycomb duct 87 and the 3rd honeycomb duct 84.Further reduce by 2 decibels of left and right of noise.Silencing board 86 is set simultaneously and can shortens the 3rd honeycomb duct 84 and the length of the 4th honeycomb duct 87 in the second noise reduction chamber 85, then the 3rd honeycomb duct 84 that 86 of silencing boards need to grow if do not arranged and the 4th honeycomb duct 87 are interspersed and could form the crooked reflux line of air-flow.
For the ease of exhaust, the axis angle of the axis of the 5th honeycomb duct 8 and the 4th honeycomb duct 87 is angle P, and span 20 degree of angle P are to 70 degree.
As mentioned above, can realize preferably the utility model.
Claims (7)
1. an automotive muffler, it is characterized in that, comprise the first noise reduction chamber (83) connecting successively, the second noise reduction chamber (85), the 3rd noise reduction chamber (88), the termination (89) of giving vent to anger, in the first noise reduction chamber (83), be provided with the second honeycomb duct (82), after extending into the second honeycomb duct (82) by the first honeycomb duct (81), introduces the gas of eliminating the noise, the first noise reduction chamber (83) is communicated with the second noise reduction chamber (85) by the 3rd honeycomb duct (84), the second noise reduction chamber (85) is communicated with the 3rd noise reduction chamber (88) by the 4th honeycomb duct (87), the 3rd noise reduction chamber (88) is communicated with external environment condition after running through the termination of giving vent to anger (89) by the 5th honeycomb duct (8), the cylindrical shell that the second honeycomb duct (82) all seals for front-end and back-end, the second honeycomb duct (82) is communicated with the first noise reduction chamber (83) by being arranged on some air passing holes of self outer wall, one end that the 3rd honeycomb duct (84) is positioned at the first noise reduction chamber (83) is closed end, and one end that the 4th honeycomb duct (87) and the 5th honeycomb duct (8) are positioned at the 3rd noise reduction chamber (88) is closed end,
The 5th honeycomb duct (8), the 4th honeycomb duct (87), equal rectangular open and flat of silencing pot (7) after the 3rd honeycomb duct (84) flattens, open and flat of silencing pot is provided with several two-door window openings (1), what two-door window opening comprised the rectangle that is arranged on silencing pot open and flat (7) crosses sound hole (6), cross sound hole (6) and be provided with crossbeam, the axis of crossbeam overlaps with the line of crossing sound hole (6) relative edge's mid point, crossbeam both sides are connected with wing plate A(4) and wing plate B(5), crossbeam will be crossed sound hole (6) and be divided into homalographic and two symmetrical through holes, wing plate A(4) and between open and flat of silencing pot form acute angle A, wing plate B(5) and between open and flat of silencing pot form acute angle B, wing plate A(4) area equals crossbeam left side and crosses sound hole (6) region area, wing plate B(5) area equals crossbeam right side and crosses sound hole (6) region area,
The region that the 3rd honeycomb duct (84) is provided with two-door window opening (1) is M district, M district is positioned at the first noise reduction chamber (83), the region that the 4th honeycomb duct (87) is provided with two-door window opening (1) is N district, N district is positioned at the 3rd noise reduction chamber (88), the region that the 5th honeycomb duct (8) is provided with two-door window opening (1) is X district, X district is positioned at the 3rd noise reduction chamber (88), the wing plate A(4 of the 3rd honeycomb duct (84) wherein) and wing plate B(5) be positioned at the 3rd honeycomb duct (84) pipe inner side, the wing plate A(4 of the 5th honeycomb duct (8)) and wing plate B(5) be positioned at the 5th honeycomb duct (8) pipe inner side, the wing plate A(4 of the 4th honeycomb duct (87)) and wing plate B(5) be positioned at the 4th honeycomb duct (87) pipe inner side.
2. a kind of automotive muffler according to claim 1, is characterized in that, wing plate A(4) and wing plate B(5) be rectangle.
3. a kind of automotive muffler according to claim 1, is characterized in that, the angle of acute angle A equals 20 degree or 30 degree or 40 degree or 50 degree or 60 degree or 70 degree, and the angle of acute angle B equals 20 degree or 30 degree or 40 degree or 50 degree or 60 degree or 70 degree.
4. a kind of automotive muffler according to claim 1, is characterized in that, the angle of acute angle A equals acute angle B.
5. a kind of automotive muffler according to claim 1, it is characterized in that, every three two-door window openings (1) rearrange the two-door window opening group of row formula (2) according to yi word pattern, three two-door window opening groups of row formula (2) are not arranged and are formed the two-door window opening group of determinant (3) according to row, the column direction of being expert at of the two-door window opening groups of two row formulas (2) separately flushes and arranges, and the two-door window opening group of row formula (2) in the middle of being positioned at all misplaces and arranges with the two-door window opening group of row formula (2) of both sides.
6. a kind of automotive muffler according to claim 1, is characterized in that, in the second noise reduction chamber (85), is also provided with silencing board (86), and silencing board (86) is positioned between the 4th honeycomb duct (87) and the 3rd honeycomb duct (84).
7. a kind of automotive muffler according to claim 1, is characterized in that, the axis angle of the axis of the 5th honeycomb duct (8) and the 4th honeycomb duct (87) is angle P, and span 20 degree of angle P are to 70 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121619.3U CN203742711U (en) | 2014-03-18 | 2014-03-18 | Automobile silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121619.3U CN203742711U (en) | 2014-03-18 | 2014-03-18 | Automobile silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203742711U true CN203742711U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420121619.3U Expired - Fee Related CN203742711U (en) | 2014-03-18 | 2014-03-18 | Automobile silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203742711U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153862A (en) * | 2014-03-18 | 2014-11-19 | 成都陵川常友汽车部件制造有限公司 | Low-noise automotive silencer |
-
2014
- 2014-03-18 CN CN201420121619.3U patent/CN203742711U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153862A (en) * | 2014-03-18 | 2014-11-19 | 成都陵川常友汽车部件制造有限公司 | Low-noise automotive silencer |
| CN104153862B (en) * | 2014-03-18 | 2016-07-06 | 成都陵川常友汽车部件制造有限公司 | A kind of low noise automotive muffler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20160318 |