CN109899132A - Exhaust pipe preprocessor and vehicle - Google Patents
Exhaust pipe preprocessor and vehicle Download PDFInfo
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- CN109899132A CN109899132A CN201711311452.1A CN201711311452A CN109899132A CN 109899132 A CN109899132 A CN 109899132A CN 201711311452 A CN201711311452 A CN 201711311452A CN 109899132 A CN109899132 A CN 109899132A
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- Prior art keywords
- exhaust pipe
- pipe
- exhaust
- cylinder
- air inlet
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The present invention relates to a kind of exhaust pipe preprocessor and vehicles.Vehicle includes vehicle frame, vehicle frame is equipped with exhaust system, exhaust system includes exhaust pipe preprocessor, exhaust pipe preprocessor includes cylinder, cylinder is equipped with air inlet and more than two exhaust pipes arranged side by side, bridge pipe is equipped between at least two exhaust pipes, link position of the bridge pipe on two exhaust pipes is staggered along exhaust pipe extending direction, for being superimposed the minus phase for the sound wave propagated in the positive phase for the sound wave propagated in one of exhaust pipe and another exhaust pipe.The case where compared to single exhaust pipe is arranged, the sectional area of the single exhaust pipe of twin exhaust pipes is opposite to be reduced, so that acoustics transmitting loss be made to increase；Bridge pipe makes the positive and negative Phase Stacking for the sound wave propagated in two exhaust pipes simultaneously, to a certain extent reduces the amplitude of sound wave, and sound wave, which is weakened, even offsets, to greatly improve the low frequency acoustical absorptivity of exhaust pipe preprocessor.
Description
Technical field
The present invention relates to a kind of exhaust pipe preprocessor and vehicles.
Background technique
Oversize vehicle matches diesel engine mostly, and diesel engine is for gasoline engine or other power sources, tool
Have the advantages that output power, the thermal efficiency are high, but the disadvantage big there is also radiated noise, especially exhaust pipe preprocessor radiate
Low-frequency noise it is very big, and this low-frequency noise is absorbed sound or sound insulation means can not be eliminated well with conventional.
Authorization Notice No. is 204419325 U of CN, discloses one in the Chinese patent that authorized announcement date is 2015.06.24
Kind twin exhaust pipes silencer, including muffler cylinder, muffler front end are equipped with stem end plate, and rear end is equipped with tail portion end plate, stem
End plate and tail portion end plate are bolted on muffler cylinder, connection air inlet pipe at stem end plate central, on the end plate of tail portion
If there are two exhaust pipe, cylinder is interior to be equipped with partition, composition diffuser casing in space in the cylinder of plate front end, in the cylinder of partition rear end
Filled with filtering sponge, air inlet pipe surface is equipped with several sound attenuation holes in diffuser casing.
The twin exhaust pipes silencer that above-mentioned patent is related to can play Noise Reduction to a certain extent, but make an uproar for low frequency
Sound still cannot be eliminated well, and acoustical absorptivity is still poor.It is, therefore, desirable to provide after a kind of preferable exhaust pipe of noise elimination effect
Processor is bigger than normal to solve the problems, such as above-mentioned low-frequency noise.
Summary of the invention
The purpose of the present invention is to provide a kind of exhaust pipe preprocessors that can be effectively reduced low-frequency noise；Of the invention
Purpose, which also resides in, provides a kind of vehicle using this exhaust pipe preprocessor.
To achieve the above object, exhaust pipe preprocessor of the invention adopts the following technical scheme that
Technical solution 1: exhaust pipe preprocessor, including cylinder, more than two rows that cylinder is equipped with air inlet and is arranged side by side
Tracheae, bridge pipe is equipped between at least two exhaust pipes, and link position of the bridge pipe on two exhaust pipes extends along exhaust pipe
Direction is staggered, with the sound wave propagated in the positive phase and another exhaust pipe for making the sound wave propagated in one of exhaust pipe
Minus phase superposition.The utility model has the advantages that gas is entered in cylinder by air inlet, and is discharged from two exhaust pipes, compared in cylinder tail
The case where single exhaust pipe is arranged in end, and the sectional area of the single exhaust pipe of two exhaust pipes is opposite to be reduced, cylinder sectional area not
Divergence ratio increases in the case where change, so that acoustics transmitting loss be made to increase；Bridge pipe makes the sound propagated in two exhaust pipes simultaneously
The positive and negative Phase Stacking of wave to a certain extent reduces the amplitude of sound wave, and sound wave, which is weakened, even offsets, to substantially mention
The low frequency acoustical absorptivity of exhaust pipe preprocessor is risen.
Technical solution 2: on the basis of technical solution 1, link position of the bridge pipe on two exhaust pipes is along row
The distance that tracheae extending direction is staggered can be such that the positive and negative phase for the sound wave propagated in two exhaust pipes is superimposed completely.Beneficial to effect
Fruit: when the positive and negative phase of two column sound waves is superimposed completely, the amplitude of two column sound waves is all reduced to zero, and sound wave is weakened degree and reaches
To maximum, so that the noise of some specific frequencies be made to be eliminated.
Technical solution 3: on the basis of technical solution 1, the bridge pipe is S-shaped.
Technical solution 4: the catalyst carrier for handling Tail Gas is equipped on the basis of technical solution 1, in cylinder.
The utility model has the advantages that Tail Gas and catalyst is made to react to be converted into innocuous gas, environmental pollution is avoided.
Technical solution 5: on the basis of technical solution 4, the catalyst carrier is honeycomb.The utility model has the advantages that honeycomb
Structure is conducive to the gas contact more uniform with catalyst, to keep the Tail Gas in gas as much as possible and catalyst
It comes into contact in a large area and reacts, guarantee purification Tail Gas as much as possible.
Technical solution 6: on the basis of technical solution 4, the sectional area of air inlet is less than cylinder lumen sectional area, catalyst
There is on the extending direction of cylinder certain distance between carrier and air inlet and form inlet end expansion cavity in cylinder.It is beneficial
Effect: when gas enters inlet end expansion cavity from air inlet, since air inlet section product is less than the sectional area of inlet end expansion cavity,
So as to eliminate part high-frequency noise.
Technical solution 7: on the basis of technical solution 6, being provided with the air inlet pipe through barrel on cylinder, air inlet pipe it is outer
Port constitutes the air inlet, and air inlet pipe is equipped with the air hole of connection its inner cavity and inlet end expansion cavity.The utility model has the advantages that gas
Enter inlet end expansion cavity from air hole, for opposite air inlet, the section of the sectional area of air hole than inlet end expansion cavity
Product is much smaller, and the variation for keeping sectional area ascending becomes apparent from, more preferable to the erasure effect of high-frequency noise.
Technical solution 8: on the basis of technical solution 5, in the extending direction of cylinder between catalyst carrier and exhaust pipe
It is upper that there is certain distance and form tail end in cylinder and rectify expansion cavity.The utility model has the advantages that gas is from the honeycomb in catalyst carrier
Hole enters tail end rectification expansion cavity, since honeycomb hole sectional area is less than the sectional area of tail end rectification expansion cavity, so as to further
Noise reduction processing is carried out to the high frequency noise not being eliminated.
Technical solution 9: it on the basis of technical solution 8, is additionally provided in tail end rectification expansion cavity close to one end of exhaust pipe
Noise elimination cotton.The utility model has the advantages that noise elimination cotton can further strengthen noise elimination effect.
Technical solution 10: on the basis of technical solution 7-9 any one, the cylinder be it is cylindric, air inlet pipe is located at
Cylinder one end and along cylinder radial direction extend, exhaust pipe along cylinder axial direction extend.The utility model has the advantages that being propagated through noise
It meets with obstruction in journey, changes direction, propagation path is elongated, to weaken noise to a certain extent.
Technical solution 11: on the basis of technical solution 1-9 any one, the exhaust pipe preprocessor further includes control
Module.
Vehicle of the invention adopts the following technical scheme that
Technical solution 1: vehicle includes vehicle frame, and vehicle frame is equipped with exhaust system, and exhaust system includes exhaust pipe preprocessor, exhaust
Pipe preprocessor includes cylinder, and cylinder is equipped with air inlet and more than two exhaust pipes arranged side by side, at least two exhaust pipes
Between be equipped with bridge pipe, link position of the bridge pipe on two exhaust pipes be staggered along exhaust pipe extending direction, for making it
In the minus phase of the positive phase of sound wave propagated in an exhaust pipe and the sound wave propagated in another exhaust pipe be superimposed.Beneficial to effect
Fruit: gas is entered in cylinder by air inlet, and is discharged from two exhaust pipes, compared to the feelings that single exhaust pipe is arranged in cylinder tail end
Condition, the sectional area of the single exhaust pipe of two exhaust pipes is opposite to be reduced, and in the case where cylinder sectional area is constant, divergence ratio increases,
To make acoustics transmitting loss increase；Bridge pipe makes the positive and negative Phase Stacking for the sound wave propagated in two exhaust pipes simultaneously, one
Determine to make in degree the amplitude of sound wave to reduce, sound wave, which is weakened, even offsets, to greatly improve the low of exhaust pipe preprocessor
Frequency acoustical absorptivity.
Technical solution 2: on the basis of technical solution 1, link position of the bridge pipe on two exhaust pipes is along row
The distance that tracheae extending direction is staggered can be such that the positive and negative phase for the sound wave propagated in two exhaust pipes is superimposed completely.Beneficial to effect
Fruit: when the positive and negative phase of two column sound waves is superimposed completely, the amplitude of two column sound waves is all reduced to zero, and sound wave is weakened degree and reaches
To maximum, so that the noise of some specific frequencies be made to be eliminated.
Technical solution 3: on the basis of technical solution 1, the bridge pipe is S-shaped.
Technical solution 4: the catalyst carrier for handling Tail Gas is equipped on the basis of technical solution 1, in cylinder.
The utility model has the advantages that Tail Gas and catalyst is made to react to be converted into innocuous gas, environmental pollution is avoided.
Technical solution 5: on the basis of technical solution 4, the catalyst carrier is honeycomb.The utility model has the advantages that honeycomb
Structure is conducive to the gas contact more uniform with catalyst, to keep the Tail Gas in gas as much as possible and catalyst
It comes into contact in a large area and reacts, guarantee purification Tail Gas as much as possible.
Technical solution 6: on the basis of technical solution 4, the sectional area of air inlet is less than cylinder lumen sectional area, catalyst
There is on the extending direction of cylinder certain distance between carrier and air inlet and form inlet end expansion cavity in cylinder.It is beneficial
Effect: when gas enters inlet end expansion cavity from air inlet, since air inlet section product is less than the sectional area of inlet end expansion cavity,
So as to eliminate part high-frequency noise.
Technical solution 7: on the basis of technical solution 6, being provided with the air inlet pipe through barrel on cylinder, air inlet pipe it is outer
Port constitutes the air inlet, and air inlet pipe is equipped with the air hole of connection its inner cavity and inlet end expansion cavity.The utility model has the advantages that gas
Enter inlet end expansion cavity from air hole, for opposite air inlet, the section of the sectional area of air hole than inlet end expansion cavity
Product is much smaller, and the variation for keeping sectional area ascending becomes apparent from, more preferable to the erasure effect of high-frequency noise.
Technical solution 8: on the basis of technical solution 5, in the extending direction of cylinder between catalyst carrier and exhaust pipe
It is upper that there is certain distance and form tail end in cylinder and rectify expansion cavity.The utility model has the advantages that gas is from the honeycomb in catalyst carrier
Hole enters tail end rectification expansion cavity, since honeycomb hole sectional area is less than the sectional area of tail end rectification expansion cavity, so as to further
Noise reduction processing is carried out to the high frequency noise not being eliminated.
Technical solution 9: it on the basis of technical solution 8, is additionally provided in tail end rectification expansion cavity close to one end of exhaust pipe
Noise elimination cotton.The utility model has the advantages that noise elimination cotton can further strengthen noise elimination effect.
Technical solution 10: on the basis of technical solution 7-9 any one, the cylinder be it is cylindric, air inlet pipe is located at
Cylinder one end and along cylinder radial direction extend, exhaust pipe along cylinder axial direction extend.The utility model has the advantages that being propagated through noise
It meets with obstruction in journey, changes direction, propagation path is elongated, to weaken noise to a certain extent.
Technical solution 11: on the basis of technical solution 1-9 any one, the exhaust pipe preprocessor further includes control
Module.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the exhaust pipe preprocessor in the specific embodiment of vehicle of the invention；
Fig. 2 is the main view of Fig. 1；
Fig. 3 is the sectional view along A-A of Fig. 2；
In figure: 1, cylinder；2, control module；3, air inlet pipe；31, air inlet；4, exhaust pipe；5, bridge pipe；6, catalyst carrier；
7, inlet end expansion cavity；8, tail end rectifies expansion cavity；9, noise elimination cotton.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
The specific embodiment 1 of vehicle of the invention, including vehicle frame, vehicle frame are equipped with exhaust system, and exhaust system includes row
Tracheae preprocessor, as shown in Figure 1 to Figure 3, exhaust pipe preprocessor include a cylindrical barrel 1, close on 1 side of cylinder
One end end is connected with air inlet pipe 3, and air inlet pipe 3 extends along 1 radial direction of cylinder, and the external port of air inlet pipe 3 forms air inlet
31, air inlet pipe 3 protrudes into the part in cylinder 1 equipped with air hole, and one end that at this moment air inlet pipe 3 protrudes into cylinder 1 can be closed, make
Gas passes through from air hole completely, can not also close, and passes through gas from end opening and air hole；Cylinder 1 is another
End is set side by side there are two exhaust pipe 4, and exhaust pipe 4 extends along 1 axial direction of cylinder, passes through S-shaped bridge pipe between two exhaust pipes 4
5 connections；Cylinder 1 is also connected with control module 2.The cellular catalyst carrier for handling Tail Gas is equipped in cylinder 1
6, honeycomb structure is conducive to the gas contact more uniform with catalyst, to keep the Tail Gas in gas as much as possible
It comes into contact in a large area and reacts to be converted into innocuous gas with catalyst, to avoid environmental pollution.Catalyst carrier 6 is by cylinder
It is divided into left and right two chambers inside body 1, since 3 sectional area of air inlet pipe is less than cylinder lumen sectional area, catalyst carrier 6 and air inlet
There is on the extending direction of cylinder 1 certain distance between pipe 3 and form inlet end expansion cavity 7 in cylinder 1, part is high in this way
Frequency noise is eliminated；Catalyst carrier 6 is honeycomb, since the sectional area of honeycomb hole is less than cylinder lumen sectional area, catalyst
There is on the extending direction of cylinder 1 certain distance between carrier 6 and exhaust pipe 4 and form tail end rectification expansion in cylinder 1
Chamber 8, so as to further be eliminated to the high frequency noise not being eliminated.Tail end rectifies in expansion cavity 8 close to the one of exhaust pipe 4
End is additionally provided with noise elimination cotton 9, to further strengthen erasure effect.
In use process, the air hole that tail gas passes through in air inlet pipe 3 first enters inlet end expansion cavity 7, during this
Part high-frequency noise is eliminated；Then the gas in inlet end expansion cavity 7 passes through cellular catalyst carrier 6 after over commutation,
Tail Gas and catalyst react and are converted into innocuous gas during this；The gas of catalyst carrier 6 is passed through later
Expansion cavity 8 is rectified into tail end, noise elimination cotton 9 is passed through after over commutation, exhaust pipe 4 is finally entered and is discharged.Gas is entering tail
Before end rectification expansion cavity 8, part high-frequency noise has been eliminated；Two exhaust pipes 4, which are arranged, can make gas that more smooth, phase be discharged
Reduce than the case where single exhaust pipe is arranged in 1 tail end of cylinder, the sectional area of the single exhaust pipe of twin exhaust pipes is opposite, in cylinder
Divergence ratio increases in the case that 1 sectional area is constant, so that acoustics transmitting loss be made to increase；By calculating, bridge pipe 5 is rationally designed
Link position on two exhaust pipes 4 makes the two positive and negative Phase Stackings of column sound wave propagated in two exhaust pipes 4, in certain journey
Reduce the amplitude of each column sound wave on degree, noise is weakened；Design can be further accurately calculated, two column sound waves are being propagated through
Positive and negative phase is superimposed completely in journey, and amplitude is all reduced to zero after such two column sound wave superposition, and noise is weakened degree and reaches most
Greatly, so that some lower noises of specific frequency be made to be eliminated, the low frequency noise generated when vehicle operation is significantly reduced.
Embodiment 2: be in place of the difference of embodiment 1, exhaust pipe set there are three or four or five etc., and at least two
Bridge pipe is equipped between a exhaust pipe.
Embodiment 3: being in place of the difference of embodiment 1, and link position of the bridge pipe on two exhaust pipes is along exhaust
The distance that pipe extending direction is staggered is superimposed the positive and negative phase for the sound wave propagated in two exhaust pipes not exclusively.
Embodiment 4: being in place of the difference of embodiment 1, and the bridge pipe is linear type.
Embodiment 5: being in place of the difference of embodiment 1, and catalyst carrier is not set in cylinder, and such case is suitable for not
The gas to contain hazardous substance.
Embodiment 6: being in place of the difference of embodiment 1, and catalyst carrier is the layer structure of relative spacing setting.
Embodiment 7: being in place of the difference of embodiment 1, and the sectional area of air inlet is equal to cylinder lumen sectional area.
Embodiment 8: it is in place of the difference of embodiment 1, inlet pipe connection is provided on cylinder, corresponds to air inlet in cylinder
Air inlet perforated pipe is provided at connecting tube, gas can enter inlet end expansion cavity from the perforation on air inlet perforated pipe；Or into
The air hole of connection its inner cavity and inlet end expansion cavity is not set on tracheae, it is such the disadvantage is that gas enters air inlet from air inlet pipe
When holding expansion cavity, since air inlet pipe sectional area and the sectional area difference of inlet end expansion cavity are little, to make disappearing for high frequency noise
Audio fruit is unobvious.
Embodiment 9: being in place of the difference of embodiment 1, and air inlet pipe and exhaust pipe are respectively provided at cylinder both ends, all along cylinder
Body axial direction extends；Or air inlet pipe and exhaust pipe are all located on cylinder side, are extended along cylinder radial direction.
The specific embodiment of exhaust pipe preprocessor of the invention with after the exhaust pipe in the embodiment of above-mentioned vehicle
The specific embodiment for managing device is identical, and details are not described herein again.
Claims (10)
1. exhaust pipe preprocessor, including cylinder, cylinder is equipped with air inlet and more than two exhaust pipes arranged side by side, special
Sign is that bridge pipe is equipped between at least two exhaust pipes, and link position of the bridge pipe on two exhaust pipes extends along exhaust pipe
Direction is staggered, with the sound wave propagated in the positive phase and another exhaust pipe for making the sound wave propagated in one of exhaust pipe
Minus phase superposition.
2. exhaust pipe preprocessor according to claim 1, characterized in that company of the bridge pipe on two exhaust pipes
The positive and negative phase for connecing the sound wave that position can make to propagate in two exhaust pipes along the distance that exhaust pipe extending direction is staggered is completely folded
Add.
3. exhaust pipe preprocessor according to claim 1, characterized in that the bridge pipe is S-shaped.
4. exhaust pipe preprocessor according to claim 1, characterized in that be equipped in cylinder for handling Tail Gas
Catalyst carrier.
5. exhaust pipe preprocessor according to claim 4, characterized in that the catalyst carrier is honeycomb.
6. exhaust pipe preprocessor according to claim 4, characterized in that the sectional area of air inlet is cut less than cylinder lumen
Area has certain distance on the extending direction of cylinder and forms inlet end in cylinder between catalyst carrier and air inlet
Expansion cavity.
7. exhaust pipe preprocessor according to claim 6, characterized in that be provided with the air inlet through barrel on cylinder
Pipe, the external port of air inlet pipe constitute the air inlet, and air inlet pipe is equipped with the air hole of connection its inner cavity and inlet end expansion cavity.
8. exhaust pipe preprocessor according to claim 5, characterized in that in cylinder between catalyst carrier and exhaust pipe
Extending direction on have certain distance and in cylinder formed tail end rectify expansion cavity.
9. exhaust pipe preprocessor according to claim 8, characterized in that tail end rectifies in expansion cavity close to exhaust pipe
One end is additionally provided with noise elimination cotton.
10. vehicle, including vehicle frame, vehicle frame is equipped with exhaust system, and exhaust system includes exhaust pipe preprocessor, after exhaust pipe
Reason device includes cylinder, and cylinder is equipped with air inlet and more than two exhaust pipes arranged side by side, characterized in that at least two exhausts
Bridge pipe is equipped between pipe, link position of the bridge pipe on two exhaust pipes is staggered along exhaust pipe extending direction, for making
The minus phase for the sound wave propagated in the positive phase for the sound wave propagated in one of exhaust pipe and another exhaust pipe is superimposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711311452.1A CN109899132A (en) | 2017-12-11 | 2017-12-11 | Exhaust pipe preprocessor and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711311452.1A CN109899132A (en) | 2017-12-11 | 2017-12-11 | Exhaust pipe preprocessor and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109899132A true CN109899132A (en) | 2019-06-18 |
Family
ID=66942732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711311452.1A Pending CN109899132A (en) | 2017-12-11 | 2017-12-11 | Exhaust pipe preprocessor and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109899132A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3776364A (en) * | 1972-04-28 | 1973-12-04 | Donaldson Co Inc | Noise reduction apparatus and method |
| GB8516446D0 (en) * | 1984-07-05 | 1985-07-31 | Shelburne Inc | Exhaust systems for i c engines |
| JPS6143217A (en) * | 1984-08-03 | 1986-03-01 | Honda Motor Co Ltd | Exhaust device of two-cycle engine |
| JPH0299711A (en) * | 1988-10-04 | 1990-04-11 | Nissan Motor Co Ltd | Muffler |
| CN103114888A (en) * | 2013-02-01 | 2013-05-22 | 郑州宇通客车股份有限公司 | Noise elimination unit of silencer and silencer using noise elimination unit |
| US20140376733A1 (en) * | 2013-06-25 | 2014-12-25 | Eberspächer Exhaust Technology GmbH & Co. KG | System for influencing exhaust noise in a multi-flow exhaust system |
| CN204419325U (en) * | 2015-01-20 | 2015-06-24 | 江西江隆汽车消声器有限公司 | A kind of twin exhaust pipes silencing apparatus |
| CN105164381A (en) * | 2013-06-05 | 2015-12-16 | 宝马股份公司 | Exhaust gas system for an internal combustion engine and method for operating the exhaust gas system |
| CN207795343U (en) * | 2017-12-11 | 2018-08-31 | 郑州宇通客车股份有限公司 | A kind of exhaust pipe preprocessor and vehicle |
-
2017
- 2017-12-11 CN CN201711311452.1A patent/CN109899132A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3776364A (en) * | 1972-04-28 | 1973-12-04 | Donaldson Co Inc | Noise reduction apparatus and method |
| GB8516446D0 (en) * | 1984-07-05 | 1985-07-31 | Shelburne Inc | Exhaust systems for i c engines |
| JPS6143217A (en) * | 1984-08-03 | 1986-03-01 | Honda Motor Co Ltd | Exhaust device of two-cycle engine |
| JPH0299711A (en) * | 1988-10-04 | 1990-04-11 | Nissan Motor Co Ltd | Muffler |
| CN103114888A (en) * | 2013-02-01 | 2013-05-22 | 郑州宇通客车股份有限公司 | Noise elimination unit of silencer and silencer using noise elimination unit |
| CN105164381A (en) * | 2013-06-05 | 2015-12-16 | 宝马股份公司 | Exhaust gas system for an internal combustion engine and method for operating the exhaust gas system |
| US20140376733A1 (en) * | 2013-06-25 | 2014-12-25 | Eberspächer Exhaust Technology GmbH & Co. KG | System for influencing exhaust noise in a multi-flow exhaust system |
| CN204419325U (en) * | 2015-01-20 | 2015-06-24 | 江西江隆汽车消声器有限公司 | A kind of twin exhaust pipes silencing apparatus |
| CN207795343U (en) * | 2017-12-11 | 2018-08-31 | 郑州宇通客车股份有限公司 | A kind of exhaust pipe preprocessor and vehicle |
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