JPH0437244B2 - - Google Patents
Info
- Publication number
- JPH0437244B2 JPH0437244B2 JP59097310A JP9731084A JPH0437244B2 JP H0437244 B2 JPH0437244 B2 JP H0437244B2 JP 59097310 A JP59097310 A JP 59097310A JP 9731084 A JP9731084 A JP 9731084A JP H0437244 B2 JPH0437244 B2 JP H0437244B2
- Authority
- JP
- Japan
- Prior art keywords
- absorbing material
- sound
- sound absorbing
- tube
- inner tube
- 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.)
- Expired - Lifetime
Links
- 239000011358 absorbing material Substances 0.000 claims description 33
- 230000000694 effects Effects 0.000 description 8
- 230000003584 silencer Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 4
- 230000030279 gene silencing Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001743 silencing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
- F01N1/006—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages comprising at least one perforated tube extending from inlet to outlet of the silencer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/023—Helmholtz resonators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/15—Plurality of resonance or dead chambers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、エンジンの消音器特に吸音素子とし
て吸音材を用いた消音器に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a muffler for an engine, and particularly to a muffler using a sound absorbing material as a sound absorbing element.
吸音材を用いた消音器は、いろいろな消音素子
の中でも最も効果的な素子の一つとして利用され
るが、多孔パンチング管などの通気性を有する内
管に太い空洞外管をかぶせ、その内外管間にグラ
スウールやロツクウールなどの吸音材を充填した
ものが一般である。
Silencers using sound-absorbing materials are used as one of the most effective of various sound-absorbing elements, but they are made by covering an air permeable inner tube such as a perforated tube with a thick hollow outer tube, and then Generally, the space between the tubes is filled with sound absorbing material such as glass wool or rock wool.
その場合、吸音材は一定厚さのマツト状に形成
したものを内管に巻きつけ、またはバインダを添
加して焼付け成形したものを内外の管の間の空洞
に充填した構成であるため、その吸音材が飛散し
て機能を低下し消音器の耐久性に問題がある。
In this case, the sound-absorbing material consists of a pine-shaped material of a certain thickness that is wrapped around the inner tube, or a material that is baked and molded with a binder added and filled into the cavity between the inner and outer tubes. The sound absorbing material scatters, reducing its functionality and causing problems with the durability of the silencer.
その原因としては、工作誤差等により吸音材の
充填が十分均一に行われ難い。吸音材の密度にも
ともとバラツキがある。振動等でガタを生じて内
外の管との間に〓間ができ排気の流れに巻き込ま
れる。また高速の排気流が作用する。これ等の諸
点が相互に関連し合つて吸音材を細分飛散させる
ものである。 The reason for this is that it is difficult to fill the sound absorbing material sufficiently uniformly due to machining errors and the like. There are variations in the density of sound-absorbing materials. Vibration causes looseness, creating a gap between the inner and outer pipes and getting caught up in the exhaust flow. A high-speed exhaust flow also comes into play. These various points interrelate to cause the sound absorbing material to be dispersed finely.
本発明は、上記吸音材を充填した式の従来の消
音器における不具合を解決することを目的として
提案されたもので、下記の構成としたことを特徴
とする。
The present invention was proposed for the purpose of solving the problems of the conventional silencer filled with the above-mentioned sound absorbing material, and is characterized by the following configuration.
通気性を有する内管に吸音材を巻きつけまたは
嵌合し、その上に編組管をかぶせて押圧保持させ
て吸音素子を構成し、その吸音素子の周囲に空洞
管をかぶせ、内管に対する吸音材取付範囲外の一
方の側において内管に設けた小開口を通じて、内
管内の主排気通路とその外側の空洞とを連通させ
たものである。 A sound-absorbing material is wrapped or fitted around a breathable inner tube, a braided tube is placed over it and held under pressure to form a sound-absorbing element, and a hollow tube is placed around the sound-absorbing element to absorb sound from the inner tube. The main exhaust passage inside the inner tube communicates with the cavity outside the inner tube through a small opening provided in the inner tube on one side outside the area where the material is attached.
上記のように吸音材を編組管によつて押圧保持
させると、細い線で編まれた編組管は軸方向にも
円周方向にもたわみ性を持つているので、吸音材
の密度・巻層間の間〓、内管との間〓等に不均一
があれば、その間〓等を押しつぶすように圧縮し
て保持するので、間〓がなく各部均一な密度の吸
音材層を形成する。
When the sound-absorbing material is pressed and held by the braided tube as described above, the braided tube made of thin wires has flexibility in both the axial and circumferential directions, so the density of the sound-absorbing material and the distance between the winding layers If there is any non-uniformity between the inner pipe and the inner tube, the space between the inner pipe and the like is compressed and held, so that there is no gap and a sound absorbing material layer with a uniform density is formed in each part.
また、内管内の主排気通路と空洞管の空間とが
吸音材取付範囲外の一方の側で内管に設けた小開
口を経て連通しているので、吸音効果にによる消
音に、更に反射効果と共鳴効果による消音作用が
加わり、また吸音材を透過してきた音波と小開口
から入つてきた音波が空洞内で干渉しあうと共
に、その小開口から空洞に入つた音波は吸音材に
も吸収されるもので、広範囲の音が消音される。 In addition, the main exhaust passage in the inner tube and the space in the hollow tube communicate through a small opening in the inner tube on one side outside the area where the sound-absorbing material is installed, so in addition to the sound absorption effect, there is also a reflection effect. In addition, the sound waves that have passed through the sound-absorbing material and the sound waves that have entered through the small openings interfere with each other within the cavity, and the sound waves that have entered the cavity through the small openings are also absorbed by the sound-absorbing material. This will muffle a wide range of sounds.
第１図において、１はパンチング内管、２はそ
の管１の外周面に巻きつけた吸音材、３は吸音材
を押圧的に保持する編組管である。
In FIG. 1, 1 is a punched inner tube, 2 is a sound absorbing material wrapped around the outer peripheral surface of the tube 1, and 3 is a braided tube that presses and holds the sound absorbing material.
組立て順序としては、マツト状の吸音材２をパ
ンチング内管１に所要厚さに巻きつけ、または焼
付成形した吸音材２を嵌合し、スチールワイヤ・
耐熱性糸・フアイバーグラス長繊維等の線材によ
る網代編み管３を吸音材２にかぶせ、軸方向に引
張つてその管径を縮めて吸音材２を十分に押圧し
た状態で、編組管３の両端部３ａを絞つて内管１
に溶接・接着等の手段で固定する。 The assembly order is to wrap the pine-shaped sound absorbing material 2 around the punched inner tube 1 to the required thickness, fit the baked sound absorbing material 2, and then attach the steel wire.
A mesh braided tube 3 made of a wire material such as heat-resistant yarn or fiberglass filament is placed over the sound absorbing material 2, and pulled in the axial direction to shorten the tube diameter and press the sound absorbing material 2 sufficiently. Squeeze the part 3a and insert the inner tube 1.
Fixed by welding, gluing, etc.
あるいは第２図のように締付け力を調整しなが
ら吸音材２の上に編み込むこともできる。そして
第３図のように編組線ａの素線ｂの数の増減、あ
るいは編目ｃの大小等で編組管３の通気性を調整
することができる。 Alternatively, it can be woven onto the sound absorbing material 2 while adjusting the tightening force as shown in FIG. As shown in FIG. 3, the air permeability of the braided tube 3 can be adjusted by increasing or decreasing the number of strands b of the braided wire a or by changing the size of the stitches c.
４は上記のように構成した吸音素子にかぶせた
空洞管で、その吸音材取付範囲Ｌより外方におい
て絞り口部４１を内管１の外周面に溶接等で固着
している。 Reference numeral 4 denotes a hollow tube that is placed over the sound absorbing element configured as described above, and a throttle opening 41 is fixed to the outer circumferential surface of the inner tube 1 by welding or the like on the outside of the sound absorbing material attachment range L.
６は上記の吸音材取付範囲Ｌ外の一方の側にお
いて内管１に設けた小開口で、空洞管４内の空洞
５を内管１内の主排気通路に連通させて、上記小
開口６を咽喉穴、空洞５を共鳴室としている。 Reference numeral 6 denotes a small opening provided in the inner tube 1 on one side outside the above-mentioned sound-absorbing material installation range L, and allows the cavity 5 in the hollow tube 4 to communicate with the main exhaust passage in the inner tube 1. is the throat hole, and cavity 5 is the resonance chamber.
本発明の消音器はそれだけでも使用できるが、
自動車用エンジン等に付設する場合は他の消音素
子と組み合わせるのが好ましい。 Although the silencer of the present invention can be used by itself,
When attached to an automobile engine, etc., it is preferable to combine it with other silencing elements.
第４図は、共鳴室８を中にしてその前後に第一
膨張室９，第二膨張室１０を備え、第二膨張室１
０，共鳴室８を貫通して第一膨張室９に開口する
排気導入管１，共鳴室８を貫通して第一膨張室９
と第二膨張室１０を通じさせる結合管７，共鳴室
８，第一膨張室９を貫いて第二膨張室１０を器外
に開放させる排出管１、および共鳴室８と第二膨
張室１０間の共鳴用咽喉管１１をそれぞれ設けた
形式の消音器に本発明の消音器を組み合わせた一
実施例で、第二膨張室１０すなわち最終膨張室に
開口している排出管１の一部にパンチング穴を設
けて内管とし、その部分に本発明の消音器を構成
したものである。 In FIG. 4, a resonance chamber 8 is provided, and a first expansion chamber 9 and a second expansion chamber 10 are provided before and after the resonance chamber 8.
0. Exhaust introduction pipe 1 that penetrates the resonance chamber 8 and opens into the first expansion chamber 9. Passes through the resonance chamber 8 and opens into the first expansion chamber 9.
and a connecting pipe 7 that communicates the second expansion chamber 10 with the resonance chamber 8, a discharge pipe 1 that passes through the resonance chamber 8 and the first expansion chamber 9 and opens the second expansion chamber 10 to the outside of the device, and between the resonance chamber 8 and the second expansion chamber 10. This is an embodiment in which the muffler of the present invention is combined with a muffler of the type in which resonance throat pipes 11 are respectively provided, and a part of the discharge pipe 1 opening into the second expansion chamber 10, that is, the final expansion chamber is punched. A hole is provided to form an inner tube, and the silencer of the present invention is constructed in that portion.
この第４図の構成の消音器においては、咽喉管
１１および共鳴室８による従来の単純共鳴作用、
並びに排気の膨張収縮の繰り返しによる音波の干
渉作用に、本発明の消音器による前記の特有の共
鳴その他の消音作用が加わり、極めて広域の周波
数帯域の消音が可能である。 In the silencer having the configuration shown in FIG. 4, the conventional simple resonance effect by the throat tube 11 and the resonance chamber 8,
In addition, the above-mentioned unique resonance and other silencing effects of the muffler of the present invention are added to the sound wave interference effect caused by the repeated expansion and contraction of the exhaust gas, making it possible to muffle noise in an extremely wide frequency band.
本発明の消音器は上記の構成であるから、吸音
材は編組管によつて〓間なく各部均一な密度で押
圧保持され、吸音材が細分されて飛散し吸音機能
を低下することがない。
Since the silencer of the present invention has the above-mentioned structure, the sound absorbing material is pressed and held at uniform density in each part by the braided tube, and the sound absorbing material is not fragmented and scattered and the sound absorbing function is not deteriorated.
吸音材・編組管の〓間を通つて空洞管内に排気
が入り、空洞管が反射効果を有すると同時に、内
管の小開口を咽喉穴、空洞管内を共鳴室として共
鳴効果を併有するので、高周波から低周波まで広
い範囲の音域に対して有効に作用する消音器が簡
単に得られる。 Exhaust air enters the hollow tube through the space between the sound-absorbing material and the braided tube, and the hollow tube has a reflection effect. At the same time, the small opening of the inner tube is used as a throat hole, and the inside of the hollow tube is used as a resonant chamber, so it has a resonance effect. A muffler that effectively acts on a wide range of sound from high frequencies to low frequencies can be easily obtained.
第１図は本発明消音器の縦断側面図、第２図は
編組管の形成要領を示す側面図、第３図は編組管
の一部の拡大図、第４図は本発明の消音器を他の
消音素子に組み込んだ実施例の縦断側面図。
１は通気性内管、２は吸音材、３は編組管、４
は空洞管、５は空洞、６は小開口。
Fig. 1 is a vertical sectional side view of the silencer of the present invention, Fig. 2 is a side view showing the procedure for forming the braided pipe, Fig. 3 is an enlarged view of a part of the braided pipe, and Fig. 4 is the silencer of the present invention. FIG. 7 is a vertical cross-sectional side view of an embodiment incorporated into another silencing element. 1 is a breathable inner tube, 2 is a sound absorbing material, 3 is a braided tube, 4
is a hollow tube, 5 is a cavity, and 6 is a small opening.
Claims (1)
は嵌合し、その上に編組管をかぶせて押圧保持さ
せて吸音素子を構成し、その吸音素子の周囲に空
洞管をかぶせ、内管に対する吸音材取付範囲外の
一方の側において内管に設けた小開口を通じて、
内管内の主排気通路とその外側の空洞とを連通さ
せたことを特徴とする消音器。1. A sound absorbing material is wrapped or fitted around a breathable inner pipe, a braided pipe is placed over the sound absorbing material and held under pressure to form a sound absorbing element, and a hollow pipe is placed around the sound absorbing element to form a sound absorbing material. Through a small opening in the inner tube on one side outside the area where the sound absorbing material is installed,
A muffler characterized in that a main exhaust passage in an inner pipe communicates with a cavity outside the main exhaust passage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9731084A JPS60240816A (en) | 1984-05-15 | 1984-05-15 | Muffler |
| US06/667,720 US4580656A (en) | 1984-04-06 | 1984-11-02 | Absorbent retainer for absorbent type muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9731084A JPS60240816A (en) | 1984-05-15 | 1984-05-15 | Muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60240816A JPS60240816A (en) | 1985-11-29 |
| JPH0437244B2 true JPH0437244B2 (en) | 1992-06-18 |
Family
ID=14188913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9731084A Granted JPS60240816A (en) | 1984-04-06 | 1984-05-15 | Muffler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60240816A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7092810B2 (en) | 2020-02-12 | 2022-06-28 | フタバ産業株式会社 | Silencer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS528731B2 (en) * | 1972-07-12 | 1977-03-11 | ||
| JPS5419470U (en) * | 1977-07-11 | 1979-02-07 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5444109Y2 (en) * | 1975-07-07 | 1979-12-19 | ||
| JPS569049Y2 (en) * | 1976-04-13 | 1981-02-27 |
-
1984
- 1984-05-15 JP JP9731084A patent/JPS60240816A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS528731B2 (en) * | 1972-07-12 | 1977-03-11 | ||
| JPS5419470U (en) * | 1977-07-11 | 1979-02-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60240816A (en) | 1985-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |