JP2002070524A - Catalyst muffler - Google Patents
Catalyst mufflerInfo
- Publication number
- JP2002070524A JP2002070524A JP2000252875A JP2000252875A JP2002070524A JP 2002070524 A JP2002070524 A JP 2002070524A JP 2000252875 A JP2000252875 A JP 2000252875A JP 2000252875 A JP2000252875 A JP 2000252875A JP 2002070524 A JP2002070524 A JP 2002070524A
- Authority
- JP
- Japan
- Prior art keywords
- outlet
- inlet
- catalyst
- silencer
- muffler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、車両の排気系等
に装着される触媒マフラに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst muffler mounted on an exhaust system of a vehicle.
【0002】[0002]
【従来の技術】従来の触媒マフラとして例えば図5に示
すようなものがある。同図のものは、中央に触媒部1を
設け、入口側空間部2及び出口側空間部3を介して入口
消音室4と出口消音室5とを設けた触媒マフラ6におい
て、入口消音室4は筒状のシェル7の一端を閉塞する第
一端壁8と通過口9を有する第一仕切壁10との間に排
出口11を有する排気流入管12を設ける一方、出口消
音室5は筒状のシェル7の他端を閉塞する第二端壁13
と消音管14を取付ける第二仕切壁15を設け、同一長
さの数個の消音管14を第二仕切壁15に取付け、入口
孔16を有する排出管17を設ける構成となっていた。2. Description of the Related Art As a conventional catalyst muffler, for example, there is one as shown in FIG. In the catalyst muffler 6 shown in the figure, a catalyst section 1 is provided at the center, and an inlet muffler 4 and an outlet muffler 5 are provided via an inlet space 2 and an outlet space 3. Provides an exhaust inlet pipe 12 having an outlet 11 between a first end wall 8 closing one end of a cylindrical shell 7 and a first partition wall 10 having a passage 9, while the outlet silencer 5 is End wall 13 for closing the other end of the shell 7
And a second partition wall 15 for mounting the muffler tube 14, several muffler tubes 14 of the same length are attached to the second partition wall 15, and a discharge pipe 17 having an inlet hole 16 is provided.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、実際に
は以下に説明する技術課題があった。すなわち、上述し
た従来の触媒マフラにあっては、消音効果が顕著である
出口消音室に取付けられる複数の消音管が同一長さであ
るために特定の周波数の騒音に対する消音しか得られ
ず、幅広い周波数に対する消音効果が不十分であるとい
う問題があった。However, there are actually the following technical problems. That is, in the above-described conventional catalyst muffler, since the plurality of mufflers attached to the exit muffler chamber, in which the muffling effect is remarkable, have the same length, only muffling for noise of a specific frequency can be obtained, and a wide range is obtained. There is a problem that the silencing effect on the frequency is insufficient.
【0004】従来のマフラの長さは大きくても1m以内
である。このような大きさで、干渉を利用してマフラの
騒音低減を図ろうとしても、位相差を1m、温度を50
0℃前後として消音できる周波数は280Hz前後であ
り、騒音寄与率の高い爆発一次成分の消音域には達しな
い。また、特に、マフラ本体に触媒が配置される触媒マ
フラにおいて、干渉を利用した騒音低減は、従来マフラ
に比べてさらに制約されることになる。The length of a conventional muffler is at most 1 m or less. With such a size, even if an attempt is made to reduce muffler noise using interference, the phase difference is 1 m and the temperature is 50 m.
The frequency that can be silenced at about 0 ° C. is about 280 Hz, and does not reach the muffling range of the explosion primary component having a high noise contribution rate. In particular, in a catalyst muffler in which a catalyst is disposed in a muffler body, noise reduction using interference is further restricted as compared with a conventional muffler.
【0005】この発明は、以上の問題点を解決するもの
であって、その目的は、出口消音室により、幅広い周波
数にわたって、特に爆発成分周波数領域の消音効果が得
られる触媒マフラを提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a catalyst muffler capable of obtaining a noise reduction effect over a wide frequency range, particularly in an explosive component frequency range, by an outlet noise reduction chamber. is there.
【0006】[0006]
【課題を解決するための手段】前記目的を達成するため
に、この発明の請求項1の触媒マフラは、中央に触媒部
を設け、該触媒部の入口側及び出口側にそれぞれ入口空
間部及び出口空間部を介して入口消音室と出口消音室を
設けた触媒マフラにおいて、前記入口消音室または出口
消音室は、筒状のシェルを閉塞する仕切壁に長消音管と
短消音管とを取付けてなることを特徴とする。長消音管
及び短消音管の本数は、単数又は複数のいずれであって
もよい。以上の構成によれば、出口側消音室は筒状のシ
ェルの他端を閉塞する第二端壁と消音管を取付ける第二
仕切壁と通過口を有する第三仕切壁を設け、消音管を取
付ける第二仕切壁と通過口を有する第三仕切壁の間に長
さの相違する消音管を取付たので、異なる周波数の騒音
を低下することができ幅広い音域の消音を行うことがで
きる。In order to achieve the above object, a catalyst muffler according to a first aspect of the present invention is provided with a catalyst section in the center, and an inlet space section and an inlet space section at an inlet side and an outlet side of the catalyst section, respectively. In a catalyst muffler provided with an inlet silencer and an outlet silencer via an outlet space, the inlet silencer or the outlet silencer has a long silencer and a short silencer attached to a partition wall closing a cylindrical shell. It is characterized by becoming. The number of long silence tubes and short silence tubes may be singular or plural. According to the above configuration, the outlet-side silencing chamber is provided with a second end wall closing the other end of the cylindrical shell, a second dividing wall for attaching the silencing tube, and a third dividing wall having a passage opening, and the silencing tube is provided. Since the muffler tubes having different lengths are mounted between the second partition wall to be mounted and the third partition wall having the passage opening, noises of different frequencies can be reduced and a wide range of sound can be muffled.
【0007】また、請求項2の触媒マフラは、中央に触
媒部を設け、該触媒部の入口側及び出口側にそれぞれ入
口空間部及び出口空間部を介して入口消音室と出口消音
室を設けた触媒マフラにおいて、前記入口消音室または
出口消音室は、筒状のシェルを閉塞する仕切壁に長消音
管を取り付けるとともに孔を形成してなることを特徴と
する。孔の個数は、単数又は複数のいずれであってもよ
い。この発明によれば、構造が簡単でしかも異なる周波
数の騒音を低下することができ幅広い音域の消音を行う
ことができる。In the catalyst muffler according to a second aspect of the present invention, a catalyst section is provided in the center, and an inlet silencer and an outlet silencer are provided on the inlet side and the outlet side of the catalyst section via an inlet space and an outlet space, respectively. In the catalyst muffler, the inlet silencer or the outlet silencer is characterized in that a long silencer is attached to a partition wall closing a cylindrical shell and a hole is formed. The number of holes may be singular or plural. ADVANTAGE OF THE INVENTION According to this invention, a structure is simple and the noise of a different frequency can be reduced, and a wide sound range can be silenced.
【0008】[0008]
【発明の実施の形態】以下、この発明の好適な第1の実
施の形態を図1を用いて詳細に説明する。同図に示され
ているように、触媒マフラ20は、中央に触媒部21を
設けるとともに、触媒部21の入口側及び出口側のそれ
ぞれに入口空間部22及び出口空間部23を介して入口
消音室24及び出口消音室25を設けてなっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first preferred embodiment of the present invention will be described in detail with reference to FIG. As shown in the drawing, the catalyst muffler 20 has a catalyst section 21 in the center, and has an inlet silencer via an inlet space section 22 and an outlet space section 23 on the inlet side and the outlet side of the catalyst section 21 respectively. A chamber 24 and an exit silencer 25 are provided.
【0009】入口消音室24は、筒状のシェル26の一
端を閉塞する第一端壁27と、入口消音室24及び入口
空間部22を区画し通過口28を有する第一仕切壁29
との間に、周囲に入口消音室24に開口する複数の排出
口30を有する排気流入管31を、第一端壁27を貫通
し、かつ端面を第一仕切壁29に突き当てて設けてな
る。The inlet silencer 24 has a first end wall 27 for closing one end of a cylindrical shell 26 and a first partition wall 29 for partitioning the inlet silencer 24 and the inlet space 22 and having a passage 28.
An exhaust inflow pipe 31 having a plurality of outlets 30 that open to the inlet silencer 24 around the first end wall 27 and is provided with the end face abutting against the first partition wall 29. Become.
【0010】一方、出口消音室25は、筒状のシェル3
2の他端を閉塞する第二端壁33と、出口空間部23及
び出口消音室25を区画し複数の消音管34が貫通して
取り付けられる第二仕切壁35と、第二端壁33及び第
二仕切壁35の間に設けられ多孔板からなる第三仕切壁
37とを備えている。消音管34は、例えば同心状に等
角度間隔で4本設けられ、すべての一端は出口空間部2
3に開口し、その他端は、長消音管38(例えば図1中
で下部に位置するもの)が第二端壁33に突き当てら
れ、短消音管39(例えば図1中で上部に位置するも
の)が第三仕切壁37に取り付けられた状態で閉塞して
いる。第三仕切壁37の適宜位置には通過口36が形成
されている。On the other hand, the outlet silencing chamber 25 is provided with a cylindrical shell 3.
A second end wall 33 that closes the other end of the second end wall, a second partition wall 35 that divides the outlet space 23 and the outlet muffler chamber 25, and through which a plurality of mufflers 34 penetrates, and a second end wall 33; A third partition wall 37 provided between the second partition walls 35 and made of a perforated plate. For example, four silencers 34 are provided concentrically at equal angular intervals, and all ends thereof are provided at the outlet space 2.
3, the other end of which has a long sound deadening tube 38 (e.g., one located at the bottom in FIG. 1) abutted against the second end wall 33, and a short sound deadening tube 39 (e.g., located at the top in FIG. 1). Is closed on the third partition wall 37. A passage port 36 is formed at an appropriate position on the third partition wall 37.
【0011】長消音管38は短消音管39の約2倍の長
さを有し(短消音管39の長さは長消音管38の1/2
〜2/3程度であることが好ましい)、長消音管38は
第二端壁33と第三仕切壁37との間の空間に連通する
複数の開口を有し、短消音管39は第二及び第三仕切壁
35,37の間の空間に連通する複数の開口を有してい
る。そして、第三仕切壁37及び第二端壁33を貫通し
第二仕切壁35に端面が突き当たるように排出管41が
設けられ、排出管41は第二及び第三仕切壁35,37
の間の空間に連通する複数の開口を有している。The long sound deadening tube 38 has a length approximately twice that of the short sound deadening tube 39 (the length of the short sound deadening tube 39 is 1 / of that of the long sound deadening tube 38).
長), the long sound deadening tube 38 has a plurality of openings communicating with the space between the second end wall 33 and the third partitioning wall 37, and the short sound deadening tube 39 has the second sound deadening tube 39. And a plurality of openings communicating with a space between the third partition walls 35 and 37. A discharge pipe 41 is provided so as to penetrate the third partition wall 37 and the second end wall 33 so that the end face abuts on the second partition wall 35, and the discharge pipe 41 is formed of the second and third partition walls 35 and 37.
Has a plurality of openings communicating with the space between the two.
【0012】以上の構成において、エンジンから排出さ
れた騒音を伴う排気ガスは排気流入管31から排出口3
0を経て入口消音室24へ入るときに共鳴や拡張などの
消音効果により消音が行われて第一仕切壁29の通過口
28から入口空間部22へ入る。入口空間部22でほぼ
均一になった排気ガスの流れが、触媒部21の触媒で浄
化されて出口空間部23を経て、出口消音室25の長消
音管38又は短消音管39を通過し、出口孔40を有す
る排出管41から大気中へ放出する際、音波の伝播距離
を変えることにより、振動位相をずらして消音すること
ができ、特に、低い周波数においても騒音低減を可能に
することができる。In the above configuration, the exhaust gas accompanied by noise discharged from the engine is discharged from the exhaust inlet pipe 31 to the outlet 3.
When the vehicle enters the inlet muffling chamber 24 through 0, the muffling is performed by a muffling effect such as resonance or expansion, and the sound enters the entrance space 22 through the passage 28 of the first partition wall 29. The flow of the exhaust gas that has become substantially uniform in the inlet space 22 is purified by the catalyst of the catalyst unit 21, passes through the outlet space 23, passes through the long muffler tube 38 or the short muffler tube 39 of the outlet muffler 25, By changing the propagation distance of the sound wave when releasing the air from the discharge pipe 41 having the outlet hole 40 into the atmosphere, the vibration phase can be shifted and the sound can be silenced. In particular, the noise can be reduced even at a low frequency. it can.
【0013】図3,4はエンジンでの実験結果を示す。
図3に周波数と騒音レベルの関係を、また図4にエンジ
ン回転数と騒音レベルの関係を示す。図3から明らかな
ように、周波数70Hzから200Hz付近の低い周波
数域において従来品よりも本発明品のほうが騒音レベル
が低下していることが示されており、またエンジン回転
数ではどのエンジン回転でも従来品より本発明品のほう
が騒音レベルが優れていることが示されている。3 and 4 show the results of experiments on the engine.
FIG. 3 shows the relationship between frequency and noise level, and FIG. 4 shows the relationship between engine speed and noise level. As is clear from FIG. 3, it is shown that the noise level of the product of the present invention is lower than that of the conventional product in the low frequency range around the frequency of 70 Hz to 200 Hz. It is shown that the product of the present invention has a better noise level than the conventional product.
【0014】次に、この発明の好適な第2の実施の形態
を図2を用いて詳細に説明する。但し、第1の実施の形
態と実質的に同じ部分には、同一符号を付して説明を省
略する。本実施の形態では、第二仕切壁35に短消音管
39を取付ける代わりに第二仕切壁35に異なる大きさ
の孔42,43を複数(多数あることが好ましい)開け
ることにより、この孔42,43から出口消音室25へ
拡張するそれぞれの拡張の仕方の差による消音効果の差
を利用することによって幅広い音域の消音を行ってい
る。Next, a second preferred embodiment of the present invention will be described in detail with reference to FIG. However, portions substantially the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, a plurality of (preferably many) holes 42 and 43 having different sizes are formed in the second partition wall 35 instead of attaching the short muffler tube 39 to the second partition wall 35. , 43 to the exit muffling chamber 25, the wide range of sound can be muffled by utilizing the difference in muffling effect due to the difference in the way of expansion.
【0015】以上の各実施形態において、長消音管38
及び短消音管39に形成される開口は多数であることが
好ましく、また、長消音管38に形成される開口の合計
面積と短消音管39に形成される開口の合計面積とは同
じであることが望ましい。In each of the above embodiments, the long sound deadening tube 38
It is preferable that the number of openings formed in the short muffler tube 39 is large, and the total area of the openings formed in the long muffler tube 38 is the same as the total area of the openings formed in the short muffler tube 39. It is desirable.
【0016】[0016]
【発明の効果】以上説明したように、本発明によれば、
入口消音室または出口消音室は、筒状のシェルを閉塞す
る仕切壁に長消音管と短消音管とを取付けてなるので、
音波の伝播距離を変えることにより、振動位相をずらし
て消音することができる。また、他の発明によれば、筒
状のシェルを閉塞する仕切壁に長消音管を取り付けると
ともに孔を形成してなるので、前述の効果が得られるほ
か、As described above, according to the present invention,
Since the inlet silencer or the outlet silencer consists of a long silencer and a short silencer attached to a partition that closes off the cylindrical shell,
By changing the propagation distance of the sound wave, the vibration phase can be shifted to muffle the sound. According to another aspect of the present invention, since the long silencer is attached to the partition wall that closes the cylindrical shell and the hole is formed, the above-described effects can be obtained.
【図1】この発明による第1の実施の形態における触媒
マフラの断面図である。FIG. 1 is a sectional view of a catalyst muffler according to a first embodiment of the present invention.
【図2】この発明の第2の実施の形態における触媒マフ
ラの断面図である。FIG. 2 is a sectional view of a catalyst muffler according to a second embodiment of the present invention.
【図3】第1の実施の形態の触媒マフラを用いた実験結
果のグラフを示す図である。FIG. 3 is a diagram showing a graph of an experimental result using the catalyst muffler of the first embodiment.
【図4】第1の実施の形態の触媒マフラを用いた実験結
果のグラフを示す図である。FIG. 4 is a diagram showing a graph of an experimental result using the catalyst muffler of the first embodiment.
【図5】従来の触媒マフラの断面図である。FIG. 5 is a cross-sectional view of a conventional catalyst muffler.
21 触媒部 24 入口消音室 25 出口消音室 32 シェル 33 第二端壁 35 第二仕切壁 36 通過口 37 第三仕切壁 38 長消音管 39 短消音管 40 出口孔 41 排出管 21 Catalyst section 24 Inlet silencer chamber 25 Outlet silencer chamber 32 Shell 33 Second end wall 35 Second partition wall 36 Passage port 37 Third partition wall 38 Long muffler tube 39 Short muffler tube 40 Exit hole 41 Discharge tube
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3G004 AA01 BA06 CA06 DA09 3G091 AA02 AB01 BA00 GA06 HA05 HB01 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G004 AA01 BA06 CA06 DA09 3G091 AA02 AB01 BA00 GA06 HA05 HB01
Claims (2)
及び出口側にそれぞれ入口空間部及び出口空間部を介し
て入口消音室と出口消音室を設けた触媒マフラにおい
て、前記入口消音室または出口消音室は、筒状のシェル
を閉塞する仕切壁に長消音管と短消音管とを取付けてな
ることを特徴とする触媒マフラ。1. A catalyst muffler having a catalyst section in the center and an inlet silencer and an outlet silencer provided at an inlet side and an outlet side of the catalyst section via an inlet space and an outlet space, respectively. A catalyst muffler characterized in that the chamber or the outlet silencer comprises a long silencer and a short silencer attached to a partition wall closing a cylindrical shell.
及び出口側にそれぞれ入口空間部及び出口空間部を介し
て入口消音室と出口消音室を設けた触媒マフラにおい
て、前記入口消音室または出口消音室は、筒状のシェル
を閉塞する仕切壁に長消音管を取り付けるとともに孔を
形成してなることを特徴とする触媒マフラ。2. A catalyst muffler in which a catalyst section is provided in the center and an inlet silencer and an outlet silencer are provided at an inlet side and an outlet side of the catalyst section via an inlet space and an outlet space, respectively. A catalyst muffler characterized in that the chamber or the outlet silencer has a long silencer tube attached to a partition wall closing a cylindrical shell and a hole is formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000252875A JP4505114B2 (en) | 2000-08-23 | 2000-08-23 | Catalyst muffler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000252875A JP4505114B2 (en) | 2000-08-23 | 2000-08-23 | Catalyst muffler |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2002070524A true JP2002070524A (en) | 2002-03-08 |
JP4505114B2 JP4505114B2 (en) | 2010-07-21 |
Family
ID=18742054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000252875A Expired - Lifetime JP4505114B2 (en) | 2000-08-23 | 2000-08-23 | Catalyst muffler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4505114B2 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006207531A (en) * | 2005-01-31 | 2006-08-10 | Ishikawajima Harima Heavy Ind Co Ltd | Muffler integrated type denitration device, internal combustion engine provided with denitration device and power generation system provided with internal combustion engine |
JP2006336496A (en) * | 2005-05-31 | 2006-12-14 | Tokyo Roki Co Ltd | Exhaust emission control muffler for diesel engine |
JP2007002817A (en) * | 2005-06-27 | 2007-01-11 | Kawasaki Heavy Ind Ltd | Exhaust system with catalyst and motorcycle having the same |
DE102008022081A1 (en) * | 2008-05-05 | 2009-11-12 | J. Eberspächer GmbH & Co. KG | Exhaust gas treatment device |
JP2010071183A (en) * | 2008-09-18 | 2010-04-02 | Yanmar Co Ltd | Exhaust emission control device |
KR100956123B1 (en) | 2008-06-11 | 2010-05-07 | 세종공업 주식회사 | Muffler within catalyst converter |
JP2011174466A (en) * | 2010-02-24 | 2011-09-08 | J Eberspecher Gmbh & Co Kg | Exhaust gas treatment device |
US8763375B2 (en) | 2010-08-19 | 2014-07-01 | J. Eberspaecher Gmbh & Co. Kg | Exhaust gas cleaning device, exhaust system, removal method |
US9222392B2 (en) | 2010-04-15 | 2015-12-29 | Eberspaecher Exhaust Technology Gmbh & Co. Kg | Exhaust gas treatment device |
JP2016205243A (en) * | 2015-04-23 | 2016-12-08 | 本田技研工業株式会社 | Exhaust device |
CN110454258A (en) * | 2019-07-09 | 2019-11-15 | 南京航空航天大学 | A kind of automobile-used single cylinder diesel engine exhausting silencer |
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JPS55180909U (en) * | 1979-06-13 | 1980-12-26 | ||
JPS5833716U (en) * | 1981-08-31 | 1983-03-04 | 日野自動車株式会社 | Silencer |
JPH10115215A (en) * | 1996-10-08 | 1998-05-06 | Tokyo Roki Kk | Catalyst exhausting system for internal combustion engine |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006207531A (en) * | 2005-01-31 | 2006-08-10 | Ishikawajima Harima Heavy Ind Co Ltd | Muffler integrated type denitration device, internal combustion engine provided with denitration device and power generation system provided with internal combustion engine |
JP4533802B2 (en) * | 2005-05-31 | 2010-09-01 | 東京濾器株式会社 | Exhaust gas purification muffler for diesel engine |
JP2006336496A (en) * | 2005-05-31 | 2006-12-14 | Tokyo Roki Co Ltd | Exhaust emission control muffler for diesel engine |
JP2007002817A (en) * | 2005-06-27 | 2007-01-11 | Kawasaki Heavy Ind Ltd | Exhaust system with catalyst and motorcycle having the same |
JP4568644B2 (en) * | 2005-06-27 | 2010-10-27 | 川崎重工業株式会社 | Exhaust device with catalyst and motorcycle equipped with the same |
DE102008022081A1 (en) * | 2008-05-05 | 2009-11-12 | J. Eberspächer GmbH & Co. KG | Exhaust gas treatment device |
US8336301B2 (en) | 2008-05-05 | 2012-12-25 | J. Eberspaecher Gmbh & Co. Kg | Exhaust gas treatment unit |
KR100956123B1 (en) | 2008-06-11 | 2010-05-07 | 세종공업 주식회사 | Muffler within catalyst converter |
JP2010071183A (en) * | 2008-09-18 | 2010-04-02 | Yanmar Co Ltd | Exhaust emission control device |
JP2011174466A (en) * | 2010-02-24 | 2011-09-08 | J Eberspecher Gmbh & Co Kg | Exhaust gas treatment device |
US9222392B2 (en) | 2010-04-15 | 2015-12-29 | Eberspaecher Exhaust Technology Gmbh & Co. Kg | Exhaust gas treatment device |
US8763375B2 (en) | 2010-08-19 | 2014-07-01 | J. Eberspaecher Gmbh & Co. Kg | Exhaust gas cleaning device, exhaust system, removal method |
JP2016205243A (en) * | 2015-04-23 | 2016-12-08 | 本田技研工業株式会社 | Exhaust device |
CN110454258A (en) * | 2019-07-09 | 2019-11-15 | 南京航空航天大学 | A kind of automobile-used single cylinder diesel engine exhausting silencer |
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