JP4582476B2 - Silencer - Google Patents

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JP4582476B2
JP4582476B2 JP2004382251A JP2004382251A JP4582476B2 JP 4582476 B2 JP4582476 B2 JP 4582476B2 JP 2004382251 A JP2004382251 A JP 2004382251A JP 2004382251 A JP2004382251 A JP 2004382251A JP 4582476 B2 JP4582476 B2 JP 4582476B2
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pipe
silencer
section
flat cross
casing
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JP2006152996A (en
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篤 木全
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Sango Co Ltd
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Sango Co Ltd
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Description

本発明は内燃機関を搭載した車両などの排気系に設けられる消音器に関する。The present invention relates to a silencer provided in an exhaust system of a vehicle or the like equipped with an internal combustion engine.

従来、内燃機関を搭載した車両などの排気系には、排気騒音を低減する目的で消音器が設けられている。消音器は、例えば、放射音を抑制するために外筒を2層以上に形成した筒状体の両開口端に端板を接合したケーシング内に、仕切板やインナパイプなどの消音要素を収容して形成されている。このような消音器は車両の床下に配置されるが、スペースの関係上、消音器のケーシングの中心軸方向が車両の幅方向になるように配置されることがあった。また、このような場合、ケーシング内に断面の径方向に第1パイプと中心軸方向に第2パイプとを設け、それぞれのパイプに上流側排気管と下流側排気管とを接続するケースが多くあった。(特許文献1参照)
特開平9−303133号公報
Conventionally, a silencer is provided in an exhaust system of a vehicle or the like equipped with an internal combustion engine for the purpose of reducing exhaust noise. A silencer, for example, contains a silencing element such as a partition plate or an inner pipe in a casing in which end plates are joined to both open ends of a cylindrical body formed of two or more outer cylinders to suppress radiated sound. Is formed. Such a silencer is disposed under the floor of the vehicle. However, due to space limitations, the center axis direction of the silencer casing may be disposed in the vehicle width direction. In such a case, there are many cases in which a first pipe in the radial direction of the cross section and a second pipe in the central axis direction are provided in the casing, and an upstream exhaust pipe and a downstream exhaust pipe are connected to each pipe. there were. (See Patent Document 1)
JP-A-9-303133

近時、車室内のスペースを大きくしつつも車両の地上高を確保するために、より扁平な断面を備えた消音器が採用される傾向にある。また一方で、消音器内に設けられ排気ガスが流通するパイプは背圧性能の面からある程度の径以上のものが必要とされている。Recently, in order to secure the ground clearance of the vehicle while increasing the space in the vehicle interior, a silencer having a flatter section tends to be employed. On the other hand, a pipe provided in the silencer and through which exhaust gas flows is required to have a diameter larger than a certain diameter from the viewpoint of back pressure performance.

したがって、上記した従来の消音器のように、第1パイプを消音器の端部に設けて第2パイプと交差しないように配置する必要があった。このため、上流側排気管を第1パイプに接続するためには、余分な排気管の取り回しが必要とされ、スペースやコストの面で問題が生じることがあった。また、第1パイプと第2パイプとが交差しないように配置する必要があるために、消音器の設計自由度が低く、消音性能の面で問題を生じることがあった。Therefore, like the conventional silencer described above, the first pipe must be provided at the end of the silencer so as not to intersect the second pipe. For this reason, in order to connect the upstream side exhaust pipe to the first pipe, it is necessary to handle an extra exhaust pipe, which may cause problems in terms of space and cost. In addition, since it is necessary to arrange the first pipe and the second pipe so as not to intersect with each other, the design freedom of the silencer is low, and there is a problem in terms of the silencing performance.

前記の課題を解決するために、請求項1記載の発明は、中心軸方向に扁平断面を備えた筒状のケーシングと、扁平断面の長径と略一致するように設けられた第1パイプと、中心軸方向に設けられた第2パイプとを備えた消音器において、前記第1パイプと前記第2パイプとが交差するように配設するとともに、前記第1パイプと前記第2パイプのどちらか一方の交差部近傍を扁平断面に形成し、かつ扁平断面に形成した側に下流側排気管を接続したことを特徴とする消音器である。In order to solve the above-mentioned problem, the invention according to claim 1 includes a cylindrical casing having a flat cross section in the central axis direction, a first pipe provided so as to substantially coincide with the long diameter of the flat cross section, In a silencer including a second pipe provided in a central axis direction, the first pipe and the second pipe are disposed so as to intersect with each other, and either the first pipe or the second pipe is disposed. The silencer is characterized in that one intersection is formed in a flat cross section and a downstream exhaust pipe is connected to the side formed in the flat cross section .

本発明によれば、背圧の増加を伴うことなく消音器をより扁平断面にすることができ、車両の地上高を高く設定することができる。その際に、第1パイプを消音器の軸方向で任意な位置に設定可能なため、スペースやコストの面で効果を発揮することができる。また、消音器の設計自由度を高くすることができ、消音性能の面で効果を発揮することができる。According to the present invention , the silencer can have a more flat cross section without increasing back pressure, and the ground clearance of the vehicle can be set high. At that time, since the first pipe can be set at an arbitrary position in the axial direction of the silencer, an effect can be exhibited in terms of space and cost. Further, the design freedom of the silencer can be increased, and the effect can be exhibited in terms of the silencing performance.

さらに、背圧の上昇を抑制することができるとともに、異音を抑制することができる。 Furthermore , an increase in back pressure can be suppressed and abnormal noise can be suppressed.

本発明を実施するための最良の形態を図1に示す一実施例に基づいて説明する。The best mode for carrying out the present invention will be described based on an embodiment shown in FIG .

図1は、一実施例の消音器1を示すもので、(a)平面断面図、(b)は(a)におけるA−A線断面図、(c)は(a)におけるB−B線断面図である。FIG. 1 shows a silencer 1 according to an embodiment , where (a) a plan sectional view, (b) is a sectional view taken along line AA in (a), and (c) is a sectional view taken along line BB in (a). It is sectional drawing.

消音器1のケーシング2は、金属製の板材を2層の筒状に形成した筒状体3に両開口端3b,3cを閉塞するように端板4,5が接合されて形成されている。筒状体3は長径Xと短径Yを備えた扁平な楕円断面に形成されている。ケーシング2内は複数の貫通孔8aを備えた仕切板8により2つの消音室13,14に区画されている。The casing 2 of the silencer 1 is formed by joining end plates 4 and 5 to a cylindrical body 3 in which a metal plate is formed in a two-layered cylinder so as to close both open ends 3b and 3c. . The cylindrical body 3 is formed in a flat elliptical cross section having a major axis X and a minor axis Y. The inside of the casing 2 is partitioned into two sound deadening chambers 13 and 14 by a partition plate 8 having a plurality of through holes 8a.

第1パイプとして上流側排気管Jと接続するためのインレットパイプ6が、ケーシング2の楕円断面の長径Xと略一致するように、筒状体3に形成された開口部3aを挿通して筒状体3を横断するように設けられている。インレットパイプ6のケーシング2内の開口端6bはキャップ9により閉塞されるとともに、インレットパイプ6の側面には消音室14と連通可能な複数の小孔11が設けられている。キャップ9は筒状体3の開口部3aと対向する位置に固着されている。なお、筒状体3の開口部3aの外周には補強部材10が設けられて耐久性の向上が図られている。The inlet pipe 6 for connecting to the upstream side exhaust pipe J as the first pipe is inserted through the opening 3 a formed in the cylindrical body 3 so as to substantially coincide with the major axis X of the elliptical cross section of the casing 2. It is provided so as to cross the body 3. The opening end 6 b in the casing 2 of the inlet pipe 6 is closed by a cap 9, and a plurality of small holes 11 that can communicate with the sound deadening chamber 14 are provided on the side surface of the inlet pipe 6. The cap 9 is fixed at a position facing the opening 3 a of the cylindrical body 3. In addition, the reinforcement member 10 is provided in the outer periphery of the opening part 3a of the cylindrical body 3, and the improvement of durability is achieved.

第2パイプとして下流側排気管Kと接続するためのアウトレットパイプ7が、ケーシング2の中心軸方向Zと略平行に、端板4に形成された開口部4aを挿通して設けられている。アウトレットパイプ7は仕切板8を貫通して消音室13に開口するように設けられるとともに、アウトレットパイプ7の側面には消音室14と連通可能な複数の小孔12が設けられている。An outlet pipe 7 for connecting to the downstream side exhaust pipe K as a second pipe is provided through the opening 4 a formed in the end plate 4 substantially parallel to the central axis direction Z of the casing 2. The outlet pipe 7 is provided so as to pass through the partition plate 8 and open to the silencing chamber 13, and a plurality of small holes 12 that can communicate with the silencing chamber 14 are provided on the side surface of the outlet pipe 7.

上述のようにインレットパイプ6とアウトレットパイプ7は交差するように設けられるとともに、アウトレットパイプ7の交差部近傍7aはインレットパイプ6と接触しないように扁平断面に形成されている。また、インレットパイプ6とアウトレットパイプ7の両者に設けられた小孔11,12はそれぞれの交差部近傍6a,7aを除いて設けられている。As described above, the inlet pipe 6 and the outlet pipe 7 are provided so as to intersect with each other, and the vicinity 7a of the outlet pipe 7 is formed in a flat cross section so as not to contact the inlet pipe 6. Further, the small holes 11 and 12 provided in both the inlet pipe 6 and the outlet pipe 7 are provided except for the vicinity of the intersections 6a and 7a.

上流側排気管Jを流通してきた排気ガスはインレットパイプ6に設けられた小孔11から消音室14に流入する。排気ガスは仕切板8に設けられた貫通孔8aを通って消音室13に流入し、アウトレットパイプ7の開口端7bからアウトレットパイプ7を通った後に、下流側排気管Kへ導かれる。なお、一部の排気ガスは消音室14から小孔12を通って直接アウトレットパイプ7に導かれる。The exhaust gas flowing through the upstream side exhaust pipe J flows into the muffler chamber 14 from the small hole 11 provided in the inlet pipe 6. The exhaust gas flows into the sound deadening chamber 13 through a through hole 8 a provided in the partition plate 8, passes through the outlet pipe 7 from the opening end 7 b of the outlet pipe 7, and is then guided to the downstream exhaust pipe K. A part of the exhaust gas is led directly from the sound deadening chamber 14 through the small hole 12 to the outlet pipe 7.

上記のようにインレットパイプ6がケーシング2の楕円断面の長径方向Xと略一致するとともに、筒状体3を横断するように設けられているために、消音器をバランスよく支持することが可能である。このため、消音器の振動を小さくすることができ耐久性の向上や車室内に伝達するこもり音の低減に効果を発揮する。また、本実施例1においては下流側排気管Kが接続されるアウトレットパイプ7の交差部近傍7aを扁平断面に形成したことにより、背圧の上昇と異音の発生を抑制することができる。Since the inlet pipe 6 substantially coincides with the major axis direction X of the elliptical cross section of the casing 2 as described above and is provided so as to cross the cylindrical body 3, the silencer can be supported in a well-balanced manner. is there. For this reason, the vibration of the silencer can be reduced, and the effect of improving the durability and reducing the hum sound transmitted to the vehicle interior is exhibited. Moreover, in the present Example 1, since the cross-section vicinity 7a of the outlet pipe 7 to which the downstream exhaust pipe K is connected is formed in a flat cross section, an increase in back pressure and generation of abnormal noise can be suppressed.

インレットパイプ6およびアウトレットパイプ7の径を一定径以上確保し、背圧の上昇を抑制した上で消音器をより扁平断面にすることができるため、車両の地上高を高くすることができる。その際にインレットパイプ6を消音器の軸方向で任意な位置に設定可能なため、スペースやコストの面で効果を発揮することができる。また、消音器の設計自由度を高くすることができ、消音性能の面で効果を発揮することができる。さらに、インレットパイプ6およびアウトレットパイプ7の交差部近傍6a,7aを除いて小孔11,12を設けているために、異音の発生を抑制することができる。Since the diameter of the inlet pipe 6 and the outlet pipe 7 can be secured to a certain diameter or more and the silencer can be made to have a flatter cross section while suppressing the increase in back pressure, the ground clearance of the vehicle can be increased. At that time, since the inlet pipe 6 can be set at an arbitrary position in the axial direction of the silencer, an effect can be exhibited in terms of space and cost. Further, the design freedom of the silencer can be increased, and the effect can be exhibited in terms of the silencing performance. Further, since the small holes 11 and 12 are provided except for the vicinity of the intersections 6a and 7a of the inlet pipe 6 and the outlet pipe 7, the generation of abnormal noise can be suppressed.

また、任意の扁平断面を備えた筒状のケーシングを採用することができる。 In addition , a cylindrical casing having an arbitrary flat cross section can be employed.

本発明の一実施例の消音器を示すもので(a)はその平面断面図、(b)は(a)におけるA−A線断面図、(c)は(a)におけるB−B線断面図。 1 shows a silencer according to an embodiment of the present invention, in which (a) is a plan sectional view thereof, (b) is a sectional view taken along line AA in (a), and (c) is a sectional view taken along line BB in (a). Figure.

1 消音器
2 ケーシング
6 インレットパイプ(第1パイプ)
7 アウトレットパイプ(第2パイプ)
6a,7a 交差部
X 長径
Y 短径
Z 中心軸
1 Silencer 2 Casing 6 Inlet pipe (first pipe)
7 Outlet pipe (second pipe)
6a, 7a Intersection X Major axis Y Minor axis Z Center axis

Claims (1)

中心軸方向に扁平断面を備えた筒状のケーシングと、扁平断面の長径と略一致するように設けられた第1パイプと、中心軸方向に設けられた第2パイプとを備えた消音器において、前記第1パイプと前記第2パイプとが交差するように配設するとともに、前記第1パイプと前記第2パイプのどちらか一方の交差部近傍を扁平断面に形成し、かつ扁平断面に形成した側に下流側排気管を接続したことを特徴とする消音器。In a silencer comprising a cylindrical casing having a flat cross section in the central axis direction, a first pipe provided so as to substantially coincide with the long diameter of the flat cross section, and a second pipe provided in the central axis direction The first pipe and the second pipe are arranged so as to intersect with each other, and the vicinity of one of the first pipe and the second pipe is formed in a flat cross section and formed in a flat cross section. A silencer characterized in that a downstream exhaust pipe is connected to the closed side .
JP2004382251A 2004-12-01 2004-12-01 Silencer Expired - Fee Related JP4582476B2 (en)

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JP4582476B2 true JP4582476B2 (en) 2010-11-17

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5994108U (en) * 1982-12-15 1984-06-26 スズキ株式会社 internal combustion engine muffler
JPS61171816U (en) * 1985-04-12 1986-10-25
JPH0478025U (en) * 1990-11-20 1992-07-08
JPH11107769A (en) * 1997-10-06 1999-04-20 Mitsubishi Motors Corp Engine room structure for vehicle
JP2002089229A (en) * 2000-09-13 2002-03-27 Kubota Corp Muffler
JP2004285916A (en) * 2003-03-24 2004-10-14 Sakamoto Industry Co Ltd Silencer of internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5994108U (en) * 1982-12-15 1984-06-26 スズキ株式会社 internal combustion engine muffler
JPS61171816U (en) * 1985-04-12 1986-10-25
JPH0478025U (en) * 1990-11-20 1992-07-08
JPH11107769A (en) * 1997-10-06 1999-04-20 Mitsubishi Motors Corp Engine room structure for vehicle
JP2002089229A (en) * 2000-09-13 2002-03-27 Kubota Corp Muffler
JP2004285916A (en) * 2003-03-24 2004-10-14 Sakamoto Industry Co Ltd Silencer of internal combustion engine

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