JP2005320896A - Exhaust manifold - Google Patents

Exhaust manifold Download PDF

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JP2005320896A
JP2005320896A JP2004138835A JP2004138835A JP2005320896A JP 2005320896 A JP2005320896 A JP 2005320896A JP 2004138835 A JP2004138835 A JP 2004138835A JP 2004138835 A JP2004138835 A JP 2004138835A JP 2005320896 A JP2005320896 A JP 2005320896A
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shell member
branch pipe
exhaust
pipe
inner shell
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JP4515816B2 (en
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Takayuki Yoshida
隆行 吉田
Yoshiaki Kawai
良紀 川合
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Futaba Industrial Co Ltd
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Futaba Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust manifold capable of obtaining reliability with a simple structure. <P>SOLUTION: An exhaust pipe 102 is connected to a collecting pipe part 24 collecting a first - a fourth branch pipe part 20 - 23 connected to each exhaust port of a multi cylinder internal combustion engine, and exhaust gas discharged from an exhaust port is sent to the exhaust pipe 102. An outer shell member 4 having the first - the fourth branch pipe parts and the collecting pipe pat 24 formed thereon is provided and an inner shell member 28 is provided inside of the collecting pipe part 24 to form a double structure. The inner shell member 28 is provided with connection pipe parts 32 - 34 to be inserted in the branch pipe parts 20, 22, 23, 25 and ribs 36 - 38 touching an inner circumference of the outer shell member 4 are formed on an outer circumference of the connecting pipe parts 32 - 34 over whole circumference. Also, the inner shell member 28 is provided with an upper part 28a and a lower pat 28b. The upper part 28a and the lower part 28b are mated to form a hollow shape and a mating section is fixed by caulking. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、多気筒内燃機関の各排気ポートから排気される排気ガスを集合させて排気管に送る排気マニホールドに関する。   The present invention relates to an exhaust manifold that collects exhaust gases exhausted from exhaust ports of a multi-cylinder internal combustion engine and sends them to an exhaust pipe.

従来より、材質・板厚等により信頼性を向上させて排気マニホールドの高耐熱化を図ると、重量が重くなり、熱容量が大きくなる。そのため、内燃機関の始動時に排気ガスが冷却されて、排気ガス浄化用触媒による浄化作用が十分に得られない。近年の世界的な環境問題に対し、排気規制は一段と強化されており、そこで、特許文献１にあるように、内燃機関の各排気ポートに接続される枝管と、枝管を集合させた集合管とを更に外殻部材により覆い、二重構造として、空気層でもって排気ガスを保温するようにしていた。
特開平１０−８９０６３号公報 Conventionally, increasing the heat resistance of the exhaust manifold by improving the reliability by the material, plate thickness, etc., increases the weight and heat capacity. Therefore, the exhaust gas is cooled when the internal combustion engine is started, and the purification action by the exhaust gas purification catalyst cannot be sufficiently obtained. With respect to recent global environmental problems, exhaust regulations have been further strengthened. Therefore, as disclosed in Patent Document 1, branch pipes connected to each exhaust port of an internal combustion engine and a set in which branch pipes are assembled. The pipe is further covered with an outer shell member to form a double structure to keep the exhaust gas warm with an air layer.
JP-A-10-89063

しかしながら、こうした従来のものでは、枝管から集合管まで二重構造としているので、構造が複雑になるという問題があった。
本発明の課題は、簡単な構造で、信頼性を得ることができる排気マニホールドを提供することにある。 However, these conventional devices have a double structure from the branch pipe to the collecting pipe, and there is a problem that the structure becomes complicated.
An object of the present invention is to provide an exhaust manifold capable of obtaining reliability with a simple structure.

かかる課題を達成すべく、本発明は課題を解決するため次の手段を取った。即ち、
多気筒内燃機関の各排気ポートに接続された枝管部を集合させた集合管部に排気管を接続し、各前記排気ポートから排気される排気ガスを前記排気管に送る排気マニホールドにおいて、
前記枝管部と前記集合管部とが形成された外殻部材を備えると共に、前記集合管部内に内殻部材を設けて二重構造としたことを特徴とする排気マニホールドがそれである。 In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In an exhaust manifold that connects an exhaust pipe to a collecting pipe part that aggregates branch pipe parts connected to each exhaust port of a multi-cylinder internal combustion engine, and sends exhaust gas exhausted from each exhaust port to the exhaust pipe,
The exhaust manifold includes an outer shell member in which the branch pipe part and the collecting pipe part are formed, and an inner shell member is provided in the collecting pipe part to form a double structure.

前記内殻部材には、前記枝管部内に挿入される接続管部を設け、前記接続管部の外周には、前記外殻部材の内周に接触するリブを全周にわたって形成するとよい。また、前記内殻部材は、アッパ部とロア部とを備え、前記アッパ部と前記ロア部とを突き合わせて中空状に形成すると共に、前記突き合わせ箇所をカシメにより固定するとよい。   The inner shell member may be provided with a connecting pipe portion to be inserted into the branch pipe portion, and a rib contacting the inner periphery of the outer shell member may be formed on the outer periphery of the connecting pipe portion over the entire circumference. The inner shell member may include an upper portion and a lower portion, and the upper portion and the lower portion may be abutted to form a hollow shape, and the abutting portion may be fixed by caulking.

本発明の排気マニホールドは、集合管部に内殻部材を設けて二重構造としたので、簡単な構造で、信頼性を得ることができるという効果を奏する。   Since the exhaust manifold of the present invention has a double structure by providing the inner shell member in the collecting pipe portion, there is an effect that reliability can be obtained with a simple structure.

以下本発明を実施するための最良の形態を図面に基づいて詳細に説明する。
図１に示すように、１は排気マニホールドで、本実施形態では、４気筒の内燃機関１００に用いられるものである。図４に示すように、内燃機関１００は第１から第４気筒♯１〜♯４に連通した第１から第４排気ポートＰ１〜Ｐ４を備えている。本実施形態では、第１気筒♯１、第３気筒♯３、第４気筒♯４、第２気筒♯２の順に点火される。 The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
As shown in FIG. 1, reference numeral 1 denotes an exhaust manifold, which is used in a four-cylinder internal combustion engine 100 in this embodiment. As shown in FIG. 4, the internal combustion engine 100 includes first to fourth exhaust ports P1 to P4 communicating with the first to fourth cylinders # 1 to # 4. In the present embodiment, ignition is performed in the order of the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4, and the second cylinder # 2.

排気マニホールド１は、大フランジ２、外殻部材４、小フランジ６を備え、大フランジ２には、第１から第４排気ポートＰ１〜Ｐ４に対応した４個の貫通孔８〜１１が穿設されている。また、大フランジ２を内燃機関１００に図示しないボルトにより取り付けるための複数の取付孔１２〜１９が形成されている（図１参照）。小フランジ６には、下流側の排気管１０２が接続される（図３参照）。   The exhaust manifold 1 includes a large flange 2, an outer shell member 4, and a small flange 6. The large flange 2 has four through holes 8 to 11 corresponding to the first to fourth exhaust ports P1 to P4. Has been. A plurality of attachment holes 12 to 19 for attaching the large flange 2 to the internal combustion engine 100 with bolts (not shown) are formed (see FIG. 1). A downstream exhaust pipe 102 is connected to the small flange 6 (see FIG. 3).

外殻部材４は、第１から第４枝管部２０〜２３と、集合管部２４とを備え、第１枝管部２０は第１排気ポートＰ１に連通する貫通孔８に挿入・固定されている。また、第２枝管部２１は第２排気ポートＰ２に連通する貫通孔９に挿入・固定され、第３枝管部２２は第３排気ポートＰ３に連通する貫通孔１０に挿入・固定され、第４枝管部２３は第４排気ポートＰ４に連通する貫通孔１１に挿入・固定されている。第１枝管部２０は第２枝管部２１と合流される合流枝管部２５に接続され、合流枝管部２５が集合管部２４に集合されると共に、第３枝管部２２、第４枝管部２３が集合管部２４に集合されている。   The outer shell member 4 includes first to fourth branch pipe portions 20 to 23 and a collecting pipe portion 24, and the first branch pipe portion 20 is inserted and fixed in the through hole 8 communicating with the first exhaust port P1. ing. The second branch pipe portion 21 is inserted / fixed into the through hole 9 communicating with the second exhaust port P2, and the third branch pipe portion 22 is inserted / fixed into the through hole 10 communicated with the third exhaust port P3. The fourth branch pipe portion 23 is inserted and fixed in the through-hole 11 communicating with the fourth exhaust port P4. The first branch pipe part 20 is connected to a joining branch pipe part 25 joined with the second branch pipe part 21, and the joining branch pipe part 25 is gathered in the collecting pipe part 24, and the third branch pipe part 22, Four branch pipe parts 23 are gathered in the collecting pipe part 24.

外殻部材４は、アッパ部４ａとロア部４ｂとを備え、アッパ部４ａとロア部４ｂとを突き合わせて内部を中空に形成、いわゆる最中構造に形成して、第１から第４枝管部２０〜２３と集合管部２４とを形成している。外殻部材４の集合管部２４には接続外管２６が接続されており、接続外管２６には小フランジ６が取り付けられている。   The outer shell member 4 includes an upper portion 4a and a lower portion 4b. The upper portion 4a and the lower portion 4b are abutted to form a hollow interior, so-called a middle structure, and the first to fourth branch pipes. The parts 20 to 23 and the collecting pipe part 24 are formed. A connecting outer pipe 26 is connected to the collecting pipe portion 24 of the outer shell member 4, and a small flange 6 is attached to the connecting outer pipe 26.

外殻部材４の集合管部２４内には、内殻部材２８が設けられており、内殻部材２８はアッパ部２８ａとロア部２８ｂとを備えている。アッパ部２８ａとロア部２８ｂとを突き合わせて内部を中空に形成、いわゆる最中構造に形成されており、外殻部材４の内周面と内殻部材２８の外周面との間には、空間３０が内殻部材２８の全外周面にわたって形成されている。   An inner shell member 28 is provided in the collecting pipe portion 24 of the outer shell member 4, and the inner shell member 28 includes an upper portion 28a and a lower portion 28b. The upper portion 28a and the lower portion 28b are abutted to form a hollow interior, that is, a so-called middle structure, and there is a space between the inner peripheral surface of the outer shell member 4 and the outer peripheral surface of the inner shell member 28. 30 is formed over the entire outer peripheral surface of the inner shell member 28.

内殻部材２８は、外殻部材４の集合管部２４の全域にわたる大きさに形成されると共に、更に、内殻部材２８には、合流枝管部２５、第３枝管部２２、第４枝管部２３に挿入される接続管部３２〜３４が形成されている。各接続管部３２〜３４の外周には、径方向外側に半円弧状に突出されたリブ３６〜３８が形成されている。   The inner shell member 28 is formed to have a size over the entire area of the collecting pipe portion 24 of the outer shell member 4, and the inner shell member 28 further includes a merging branch pipe portion 25, a third branch pipe portion 22, a fourth branch pipe portion. Connection pipe parts 32 to 34 to be inserted into the branch pipe part 23 are formed. Ribs 36 to 38 are formed on the outer peripheries of the connecting pipe portions 32 to 34 so as to protrude radially outward in a semicircular arc shape.

各リブ３６〜３８は、それぞれ合流枝管部２５、第３枝管部２２、第４枝管部２３の内周に締め代を持って接触するように形成されている。本実施形態では、合流枝管部２５、第３枝管部２２、第４枝管部２３は、集合管部２４側が径方向に膨らまされて形成されており、この膨らまされた合流枝管部２５、第３枝管部２２、第４枝管部２３の内径よりも、各リブ３６〜３８の外径を少し大きく形成して、内殻部材２８を集合管部２４に収納する際に、各リブ３６〜３８が弾性変形されて、接触するように形成されている。この接触により、空間３０と合流枝管部２５、第３枝管部２２、第４枝管部２３との連通を遮断するように形成されている。   Each of the ribs 36 to 38 is formed so as to come into contact with the inner periphery of the merging branch pipe part 25, the third branch pipe part 22, and the fourth branch pipe part 23 with an interference. In this embodiment, the merging branch pipe part 25, the third branch pipe part 22, and the fourth branch pipe part 23 are formed by radially inflating the collecting pipe part 24 side, and this swelled merging branch pipe part 25, when the outer diameter of each of the ribs 36 to 38 is slightly larger than the inner diameter of the third branch pipe part 22 and the fourth branch pipe part 23, and when the inner shell member 28 is stored in the collecting pipe part 24, Each rib 36-38 is elastically deformed and formed so as to contact. By this contact, the communication between the space 30 and the merge branch pipe part 25, the third branch pipe part 22, and the fourth branch pipe part 23 is blocked.

また、各接続管部３２〜３４は、各リブ３６〜３８を合流枝管部２５、第３枝管部２２、第４枝管部２３内に挿入できる程度の長さに形成されており、各接続管部３２〜３４は、それぞれ合流枝管部２５、第３枝管部２２、第４枝管部２３内で開口されている。各接続管部３２〜３４の内径は、合流枝管部２５、第３枝管部２２、第４枝管部２３の内径とほぼ等しく形成するのが好ましい。   Moreover, each connection pipe part 32-34 is formed in the length which can insert each rib 36-38 in the merge branch pipe part 25, the 3rd branch pipe part 22, and the 4th branch pipe part 23, The connection pipe parts 32 to 34 are opened in the merge branch pipe part 25, the third branch pipe part 22, and the fourth branch pipe part 23, respectively. It is preferable that the inner diameters of the connection pipe portions 32 to 34 are formed to be approximately equal to the inner diameters of the merge branch pipe portion 25, the third branch pipe portion 22, and the fourth branch pipe portion 23.

内殻部材２８のアッパ部２８ａとロア部２８ｂとは、図５に示すように、突き合わせ箇所がカシメにより一体に固定されている。即ち、アッパ部２８ａの外周に耳部４０を形成し、ロア部２８ｂの外周に形成された耳部４２を折り曲げて、アッパ部２８ａの耳部４０を挟み込むようにしてカシメている。   The upper portion 28a and the lower portion 28b of the inner shell member 28 are integrally fixed by caulking as shown in FIG. That is, the ear portion 40 is formed on the outer periphery of the upper portion 28a, the ear portion 42 formed on the outer periphery of the lower portion 28b is bent, and the ear portion 40 of the upper portion 28a is sandwiched.

一方、接続外管２６内には、接続内管４４が同軸上に配置されており、接続内管４４は内殻部材２８に挿入されて、内殻部材２８の内部と接続されている。接続内管４４は、外周に装着されたワイヤメッシュ等の支持部材４６を介して、接続外管２６に支持されている。   On the other hand, a connection inner tube 44 is coaxially arranged in the connection outer tube 26, and the connection inner tube 44 is inserted into the inner shell member 28 and connected to the inside of the inner shell member 28. The connection inner tube 44 is supported by the connection outer tube 26 via a support member 46 such as a wire mesh mounted on the outer periphery.

次に、前述した本実施形態の排気マニホールドの作動について説明する。
まず、内燃機関１００の運転に伴って、第１から第４排気ポートＰ１〜Ｐ４から排気ガスが排出される。排出された排気ガスは、第１から第４枝管部２０〜２３から排気マニホールド１内に流入し、第１から第４枝管部２０〜２３から内殻部材２８内に導かれ、内殻部材２８から接続内管４４を介して、下流側の排気管１０２に流出する。 Next, the operation of the exhaust manifold of the present embodiment described above will be described.
First, as the internal combustion engine 100 is operated, exhaust gas is discharged from the first to fourth exhaust ports P1 to P4. The discharged exhaust gas flows into the exhaust manifold 1 from the first to fourth branch pipe portions 20 to 23, and is led into the inner shell member 28 from the first to fourth branch pipe portions 20 to 23, and the inner shell. It flows out from the member 28 to the exhaust pipe 102 on the downstream side through the connection inner pipe 44.

内燃機関１００では、第１気筒♯１、第３気筒♯３、第４気筒♯４、第２気筒♯２の順に点火されるので、排気ガスは第１枝管部２０、第３枝管部２２、第４枝管部２３、第２枝管部２１の順序で、流入する。第１枝管部２０に流入した第１気筒♯１からの排気ガスは、合流枝管部２５、接続管部３２から内殻部材２８内に流入し、内殻部材２８から接続内管４４を通り、下流側の排気管１０２に流出する。第３枝管部２２に流入した第３気筒♯３からの排気ガスは、接続管部３３から内殻部材２８内に流入し、内殻部材２８から接続内管４４を通り、下流側の排気管１０２に流出する。   In the internal combustion engine 100, the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4, and the second cylinder # 2 are ignited in this order, so that the exhaust gas is in the first branch pipe section 20 and the third branch pipe section. 22, the 4th branch pipe part 23, and the 2nd branch pipe part 21 flow in order. The exhaust gas from the first cylinder # 1 that has flowed into the first branch pipe portion 20 flows into the inner shell member 28 from the merging branch pipe portion 25 and the connection pipe portion 32, and passes through the connection inner pipe 44 from the inner shell member 28. And flows out to the exhaust pipe 102 on the downstream side. The exhaust gas from the third cylinder # 3 that has flowed into the third branch pipe portion 22 flows into the inner shell member 28 from the connection pipe portion 33, passes through the connection inner pipe 44 from the inner shell member 28, and is exhausted downstream. It flows out to the tube 102.

第４枝管部２３に流入した第４気筒♯４からの排気ガスは、接続管部３４から内殻部材２８内に流入し、内殻部材２８から接続内管４４を通り、下流側の排気管１０２に流出する。第２枝管部２１に流入した第２気筒♯２からの排気ガスは、合流枝管部２５、接続管部３２から内殻部材２８内に流入し、内殻部材２８から接続内管４４を通り、下流側の排気管１０２に流出する。これが、内燃機関１００の運転に伴って順に繰り返される。   The exhaust gas from the fourth cylinder # 4 that has flowed into the fourth branch pipe portion 23 flows into the inner shell member 28 from the connection pipe portion 34, passes through the connection inner pipe 44 from the inner shell member 28, and is exhausted downstream. It flows out to the tube 102. The exhaust gas from the second cylinder # 2 that has flowed into the second branch pipe portion 21 flows into the inner shell member 28 from the merging branch pipe portion 25 and the connection pipe portion 32, and passes through the connection inner pipe 44 from the inner shell member 28. And flows out to the exhaust pipe 102 on the downstream side. This is repeated in order as the internal combustion engine 100 is operated.

このように、第１〜第４気筒♯１〜♯４からの排気ガスは、第１〜第４枝管部２０〜２３をそれぞれ個別に通り、各接続管部３２〜３４を介して内殻部材２８内に流入して、内殻部材２８内で集合される。各第１〜第４枝管部２０〜２３では、排気ガスが個別に通るので、各第１〜第４枝管部２０〜２３では間欠的に排気ガスが通り、各第１〜第４枝管部２０〜２３の温度上昇は少なく、各第１〜第４枝管部２０〜２３の表面温度は高温になりにくい。   As described above, the exhaust gas from the first to fourth cylinders # 1 to # 4 individually passes through the first to fourth branch pipe portions 20 to 23 and passes through the connecting pipe portions 32 to 34, respectively. It flows into the member 28 and is assembled in the inner shell member 28. Since the exhaust gas individually passes through each of the first to fourth branch pipe portions 20 to 23, the exhaust gas passes intermittently through each of the first to fourth branch pipe portions 20 to 23, and the first to fourth branches. The temperature rise of the pipe parts 20-23 is small, and the surface temperature of each 1st-4th branch pipe part 20-23 does not become high temperature easily.

これに対して、内殻部材２８では、各第１〜第４枝管部２０〜２３からの排気ガスが集合されるので、排気ガスが連続的に流入する。集合管部２４と内殻部材２８とにより二重構造となっており、空間３０により断熱が図られるので、外殻部材４の集合管部２４の表面温度が高温になることが防止される。   On the other hand, in the inner shell member 28, the exhaust gas from each of the first to fourth branch pipe portions 20-23 is collected, so that the exhaust gas flows continuously. Since the collecting pipe portion 24 and the inner shell member 28 form a double structure and heat insulation is achieved by the space 30, it is possible to prevent the surface temperature of the collecting pipe portion 24 of the outer shell member 4 from becoming high.

従って、外殻部材４は、その材質を耐熱性の低い材料で形成することができ、また、その板厚を薄くすることもでき、コストを低減できる。また、内殻部材２８を設けているので、集合管部２４が高温となるのを防止でき、信頼性が向上し、内殻部材２８は集合管部２４に設け、各第１〜第４枝管部２０〜２３には設けていないので、構造が簡単になり、製造も容易である。   Therefore, the outer shell member 4 can be formed of a material having low heat resistance, and the thickness of the outer shell member 4 can be reduced, thereby reducing the cost. Further, since the inner shell member 28 is provided, it is possible to prevent the temperature of the collecting pipe portion 24 from being increased, and the reliability is improved. Since the pipe portions 20 to 23 are not provided, the structure is simplified and the manufacture is easy.

また、外殻部材４のアッパ部４ａとロア部４ｂとを突き合わせて、内部に内殻部材２８を収納する組立作業で、リブ３６〜３８により、第１〜第４枝管部２０〜２３に流入する排気ガスが空間３０へ流入するのを規制できるので、製造が容易である。リブ３６〜３８はプレス加工により形成できるので、リブ３６〜３８の製造も容易である。更に、内殻部材２８は、アッパ部２８ａとロア部２８ｂとを突き合わせて、カシメにより固定しているので、全周を溶接等により突き合わせるよりも、簡単に構成できる。   In addition, the upper shell 4a and the lower shell 4b of the outer shell member 4 are brought into contact with each other, and the inner shell member 28 is accommodated therein, so that the first to fourth branch pipe portions 20-23 are formed by ribs 36-38. Since the inflowing exhaust gas can be restricted from flowing into the space 30, manufacturing is easy. Since the ribs 36 to 38 can be formed by pressing, the ribs 36 to 38 can be easily manufactured. Further, since the inner shell member 28 is abutted against the upper portion 28a and the lower portion 28b and fixed by caulking, the inner shell member 28 can be configured more easily than the entire periphery is abutted by welding or the like.

以上本発明はこの様な実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲において種々なる態様で実施し得る。   The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

本発明の一実施形態としての排気マニホールドの正面図である。It is a front view of the exhaust manifold as one embodiment of the present invention. 本実施形態の排気マニホールドの平面図である。It is a top view of the exhaust manifold of this embodiment. 本実施形態の排気マニホールドの側面図である。It is a side view of the exhaust manifold of this embodiment. 図１のＡＡ断面図である。It is AA sectional drawing of FIG. 図１のＢＢ断面図である。It is BB sectional drawing of FIG.

符号の説明Explanation of symbols

１…排気マニホールド ２…大フランジ
４…外殻部材 ６…小フランジ
２０…第１枝管部 ２１…第２枝管部
２２…第３枝管部 ２３…第４枝管部
２４…集合管部 ２５…合流枝管部
２６…接続外管 ２８…内殻部材
３０…空間 ３２〜３４…接続管部
３６〜３８…リブ ４４…接続内管
１００…内燃機関 １０２…排気管 DESCRIPTION OF SYMBOLS 1 ... Exhaust manifold 2 ... Large flange 4 ... Outer shell member 6 ... Small flange 20 ... 1st branch pipe part 21 ... 2nd branch pipe part 22 ... 3rd branch pipe part 23 ... 4th branch pipe part 24 ... Collecting pipe part 25 ... Junction branch pipe part 26 ... Connection outer pipe 28 ... Inner shell member 30 ... Space 32-34 ... Connection pipe part 36-38 ... Rib 44 ... Connection inner pipe 100 ... Internal combustion engine 102 ... Exhaust pipe

Claims (3)

多気筒内燃機関の各排気ポートに接続された枝管部を集合させた集合管部に排気管を接続し、各前記排気ポートから排気される排気ガスを前記排気管に送る排気マニホールドにおいて、
前記枝管部と前記集合管部とが形成された外殻部材を備えると共に、前記集合管部内に内殻部材を設けて二重構造としたことを特徴とする排気マニホールド。 In an exhaust manifold that connects an exhaust pipe to a collecting pipe part that aggregates branch pipe parts connected to each exhaust port of a multi-cylinder internal combustion engine, and sends exhaust gas exhausted from each exhaust port to the exhaust pipe,
An exhaust manifold comprising an outer shell member in which the branch pipe part and the collecting pipe part are formed, and an inner shell member provided in the collecting pipe part to form a double structure. 前記内殻部材には、前記枝管部内に挿入される接続管部を設け、前記接続管部の外周には、前記外殻部材の内周に接触するリブを全周にわたって形成したことを特徴とする請求項１に記載の排気マニホールド。 The inner shell member is provided with a connecting pipe portion to be inserted into the branch pipe portion, and a rib contacting the inner periphery of the outer shell member is formed on the entire outer periphery of the connecting pipe portion. The exhaust manifold according to claim 1. 前記内殻部材は、アッパ部とロア部とを備え、前記アッパ部と前記ロア部とを突き合わせて中空状に形成すると共に、前記突き合わせ箇所をカシメにより固定したことを特徴とする請求項１又は請求項２に記載の排気マニホールド。
2. The inner shell member includes an upper portion and a lower portion, the upper portion and the lower portion are abutted to form a hollow shape, and the abutting portion is fixed by caulking. The exhaust manifold according to claim 2.
JP2004138835A 2004-05-07 2004-05-07 Exhaust manifold Expired - Fee Related JP4515816B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010048114A (en) * 2008-08-20 2010-03-04 Honda Motor Co Ltd Exhaust structure of internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0166424U (en) * 1987-10-22 1989-04-27
JPH08277995A (en) * 1995-04-05 1996-10-22 Nissan Motor Co Ltd Double exhaust pipe
JPH09125948A (en) * 1995-10-31 1997-05-13 Toshiomi Hayashi Method for assembling exhaust-system piping of engine and its assembled structure
JPH10115220A (en) * 1996-10-09 1998-05-06 Honda Motor Co Ltd Exhaust manifold for multicylinder internal combustion engine
JPH10252457A (en) * 1997-03-17 1998-09-22 Yutaka Giken Co Ltd Exhaust manifold for four cylinder engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0166424U (en) * 1987-10-22 1989-04-27
JPH08277995A (en) * 1995-04-05 1996-10-22 Nissan Motor Co Ltd Double exhaust pipe
JPH09125948A (en) * 1995-10-31 1997-05-13 Toshiomi Hayashi Method for assembling exhaust-system piping of engine and its assembled structure
JPH10115220A (en) * 1996-10-09 1998-05-06 Honda Motor Co Ltd Exhaust manifold for multicylinder internal combustion engine
JPH10252457A (en) * 1997-03-17 1998-09-22 Yutaka Giken Co Ltd Exhaust manifold for four cylinder engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010048114A (en) * 2008-08-20 2010-03-04 Honda Motor Co Ltd Exhaust structure of internal combustion engine

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