JP5543423B2 - Exhaust pipe structure of internal combustion engine - Google Patents

Exhaust pipe structure of internal combustion engine Download PDF

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JP5543423B2
JP5543423B2 JP2011275286A JP2011275286A JP5543423B2 JP 5543423 B2 JP5543423 B2 JP 5543423B2 JP 2011275286 A JP2011275286 A JP 2011275286A JP 2011275286 A JP2011275286 A JP 2011275286A JP 5543423 B2 JP5543423 B2 JP 5543423B2
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exhaust pipe
internal combustion
combustion engine
cylinder
pipe structure
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JP2013124637A (en
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登章 永田
紘也 中澤
博 栗原
循生 加茂
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Honda Motor Co Ltd
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Description

本発明は、内燃機関に取付けられる排気管取付部が補強された内燃機関の排気管構造に関する。   The present invention relates to an exhaust pipe structure of an internal combustion engine in which an exhaust pipe mounting portion attached to the internal combustion engine is reinforced.

内燃機関に排気管を取付ける構造として、排気管の上流端にフランジ部を設け、このフランジ部を内燃機関の排気口にボルト・ナット等で締結することが一般に行われている。
このような内燃機関の排気管構造として、排気管にフランジ金具が溶接され、このフランジ金具が内燃機関の排気ポートに接続されるものが知られている(例えば、特許文献1参照)。
上記のフランジ金具は、内燃機関側にねじ止めされるフランジ本体と、このフランジ本体から一体に突出する筒部とを備え、筒部の突出端縁と排気管を構成するパイプ材の端部とが溶接されている。筒部の突出端縁は、側面視で上縁が下縁よりも突出した傾斜面形状に形成されるため、筒部の突出端縁とパイプ材の外周面との溶接線が長くなり、筒部とパイプ材との結合強度を高めている。
As a structure for attaching an exhaust pipe to an internal combustion engine, generally, a flange portion is provided at an upstream end of the exhaust pipe, and this flange portion is fastened to an exhaust port of the internal combustion engine with a bolt, a nut or the like.
As such an exhaust pipe structure of an internal combustion engine, there is known one in which a flange fitting is welded to the exhaust pipe and this flange fitting is connected to an exhaust port of the internal combustion engine (see, for example, Patent Document 1).
The flange fitting includes a flange main body screwed to the internal combustion engine side, and a cylindrical portion protruding integrally from the flange main body, and a protruding end edge of the cylindrical portion and an end portion of the pipe material constituting the exhaust pipe, Are welded. Since the protruding end edge of the tube portion is formed in an inclined surface shape with the upper edge protruding from the lower edge in a side view, the weld line between the protruding end edge of the tube portion and the outer peripheral surface of the pipe material becomes longer, and the tube The joint strength between the pipe and the pipe is increased.

特開平5−133224号公報JP-A-5-133224

特許文献1では、筒部の上縁及び下縁が、内燃機関のシリンダ軸線に沿って並んでいるので、シリンダ軸線方向に発生する内燃機関の振動によって、特に、大きく突出した上縁部分に応力が集中するという課題がある。
本発明は、上述した事情を鑑みてなされたものであり、その目的は、排気管上流端の応力集中を防止することが可能な内燃機関の排気管構造を提供することにある。
In Patent Document 1, since the upper edge and the lower edge of the cylindrical portion are arranged along the cylinder axis of the internal combustion engine, stress is particularly generated in the upper edge portion that protrudes greatly due to the vibration of the internal combustion engine that occurs in the cylinder axis direction. There is a problem of concentration.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an exhaust pipe structure for an internal combustion engine that can prevent stress concentration at the upstream end of the exhaust pipe.

上述した課題を解決するため、本発明は、内燃機関(27)に接続される排気管(46)が、管状の排気管本体(85)と、この排気管本体(85)の上流端に取付けられる筒部(86)と、この筒部(86)に設けられて前記内燃機関(27)側の取付部(77)に接続されるフランジ部(87)とを備え、前記筒部(86)は該筒部(86)の軸線(86E)に対して傾斜した傾斜端面(86b)を有し、この傾斜端面(86b)が前記排気管本体(85)の外周面(85d)に接合される内燃機関の排気管構造において、前記傾斜端面(86b)で最も突出する最突出部(86c)と最も後退する最後退部(86d)とを、前記フランジ部(87)における前記内燃機関(27)側の取付部(77)への接合面(87c)に直交する方向から見たときに、前記最突出部(86c)と前記最後退部(86d)とを通る仮想線(97)が、前記内燃機関(27)のシリンダ軸線(75)に対して傾斜していることを特徴とする。   In order to solve the above-described problems, the present invention is configured such that an exhaust pipe (46) connected to an internal combustion engine (27) is attached to a tubular exhaust pipe main body (85) and an upstream end of the exhaust pipe main body (85). And a flange portion (87) provided on the cylinder portion (86) and connected to the mounting portion (77) on the internal combustion engine (27) side, the cylinder portion (86). Has an inclined end surface (86b) inclined with respect to the axis (86E) of the cylindrical portion (86), and the inclined end surface (86b) is joined to the outer peripheral surface (85d) of the exhaust pipe body (85). In the exhaust pipe structure of the internal combustion engine, the most protruding portion (86c) that protrudes most at the inclined end surface (86b) and the most retracted portion (86d) that retracts most are the internal combustion engine (27) in the flange portion (87). Direction orthogonal to the joint surface (87c) to the side mounting part (77) When viewed from above, an imaginary line (97) passing through the most projecting portion (86c) and the last retracted portion (86d) is inclined with respect to the cylinder axis (75) of the internal combustion engine (27). It is characterized by that.

この構成によれば、シリンダ軸線に対して傾斜端面の最突出部と最後退部とを通る仮想線を傾斜させることで、シリンダ軸線が延びる方向の筒部周位置に対して最突出部と最後退部とをずらして配置することができ、シリンダ軸線の延びる方向に排気管が振動したときに、傾斜端面の最突出部に応力が集中するのを防ぐことができる上、上記振動を傾斜端面における最突出部と最後退部とを繋ぐ傾斜部で受けるようにすることで応力を効率良く分散させることができる。従って、傾斜端面形状により筒部と排気管本体との接合強度を高めながら筒部の最突出部での応力集中を防ぐことができる。   According to this configuration, by tilting the imaginary line that passes through the most protruding portion and the most retracted portion of the inclined end surface with respect to the cylinder axis, the most protruding portion and the last protruding portion with respect to the cylindrical portion circumferential position in the direction in which the cylinder axis extends. When the exhaust pipe vibrates in the direction in which the cylinder axis extends, the stress can be prevented from concentrating on the most protruding portion of the inclined end face, and the vibration is applied to the inclined end face. The stress can be efficiently dispersed by receiving at the inclined portion connecting the most projecting portion and the most retracted portion. Therefore, it is possible to prevent stress concentration at the most projecting portion of the cylindrical portion while increasing the bonding strength between the cylindrical portion and the exhaust pipe main body due to the inclined end surface shape.

上記構成において、前記排気管本体(85)は、その上流端から下流側へ離れた位置に屈曲部(85b)を備え、この屈曲部(85b)の外周側寄りに前記筒部(86)の最突出部(86c)が設けられていても良い。この構成によれば、屈曲部の外周側寄りでは、屈曲部と最突出部とが干渉しにくくなるため、最突出部を長く確保することができ、この結果、排気管本体と筒部との溶接線を長くすることができ、排気管本体と筒部との接合強度をより高めることができるとともに接合部の応力分散効果を高めることができる。
また、上記構成において、前記排気管本体(85)は、前記筒部(86)内を貫通しつつ嵌合するとともに、前記筒部(86)は、前記フランジ部(87)内を貫通しつつ嵌合するようにしても良い。この構成によれば、排気管本体の上流端の広範囲を筒部とフランジ部とで強固に補強することができる。
In the above configuration, the exhaust pipe main body (85) includes a bent portion (85b) at a position away from the upstream end to the downstream side, and the cylindrical portion (86) is located closer to the outer peripheral side of the bent portion (85b). The most protruding part (86c) may be provided. According to this configuration, the bent portion and the most protruding portion are less likely to interfere with each other near the outer peripheral side of the bent portion, so that the most protruding portion can be secured long. The weld line can be lengthened, the joint strength between the exhaust pipe main body and the tube part can be further increased, and the stress dispersion effect of the joint part can be enhanced.
In the above configuration, the exhaust pipe main body (85) is fitted while penetrating through the cylindrical portion (86), and the cylindrical portion (86) is penetrating through the flange portion (87). You may make it fit. According to this configuration, a wide range of the upstream end of the exhaust pipe main body can be reinforced with the cylinder portion and the flange portion.

また、上記構成において、前記フランジ部(87)と前記筒部(86)の傾斜端面(86b)との間に、前記筒部(86)の外周面(86g)と接合される環状の補強部材(88)が設けられるようにしても良い。この構成によれば、補強部材を筒部の外周面に接合して筒部を補強することができる。
また、上記構成において、前記補強部材(88)は、周方向に複数に分割され、前記補強部材(88)と前記筒部(86)、及び前記補強部材(88)の分割部(88a)同士がそれぞれ溶接されるようにしても良い。この構成によれば、補強部材を分割することで、分割部の筒部への密着性を向上させることができ、補強効果を高めることができて、筒部をより一層強固に補強することができる。
Moreover, in the said structure, the annular reinforcement member joined with the outer peripheral surface (86g) of the said cylinder part (86) between the said flange part (87) and the inclination end surface (86b) of the said cylinder part (86). (88) may be provided. According to this structure, a reinforcement member can be joined to the outer peripheral surface of a cylinder part, and a cylinder part can be reinforced.
Moreover, the said structure WHEREIN: The said reinforcement member (88) is divided | segmented into multiple in the circumferential direction, The division part (88a) of the said reinforcement member (88), the said cylinder part (86), and the said reinforcement member (88) is mutually. May be welded to each other. According to this configuration, by dividing the reinforcing member, it is possible to improve the adhesion of the divided portion to the cylindrical portion, to enhance the reinforcing effect, and to reinforce the cylindrical portion more firmly. it can.

また、上記構成において、前記フランジ部(87)は、前記補強部材(88)側の面(87d)が前記筒部(86)の外周面(86g)に溶接されるようにしても良い。この構成によれば、補強部材と筒部の外周面との接合部に、フランジ部の補強部材側の面と筒部の外周面との接合部を近接させることで、剛性の高い部分が接近することになり、フランジ部と補強部材との間の筒部の剛性を高めることができる。
また、上記構成において、前記フランジ部(87)は、略ひし形に形成され、このひし形の対向する2つの頂部を通る直線(103)上に前記筒部(86)の最突出部(86c)及び最後退部(86d)が位置するようにしても良い。この構成によれば、筒部にフランジ部を取付ける際に、最突出部及び最後退部の位置を基準にして筒部に対してフランジ部を容易に位置決めすることができ、組付性を向上させることができる。
Moreover, the said structure WHEREIN: As for the said flange part (87), you may make it the surface (87d) by the side of the said reinforcing member (88) weld to the outer peripheral surface (86g) of the said cylinder part (86). According to this configuration, a portion having high rigidity approaches a joint portion between the reinforcing member and the outer peripheral surface of the cylindrical portion by bringing the joint portion between the reinforcing member side surface of the flange portion and the outer peripheral surface of the cylindrical portion closer. As a result, the rigidity of the cylindrical portion between the flange portion and the reinforcing member can be increased.
Further, in the above configuration, the flange portion (87) is formed in a substantially rhombus shape, and the most projecting portion (86c) of the cylindrical portion (86) and a straight line (103) passing through two opposing top portions of the rhombus, The last retracting part (86d) may be located. According to this configuration, when attaching the flange portion to the cylindrical portion, the flange portion can be easily positioned with respect to the cylindrical portion with reference to the positions of the most protruding portion and the most retracted portion, and the assembling property is improved. Can be made.

また、上記構成において、前記シリンダ軸線(75)は、車両前後方向に延び且つ略水平になるように前傾し、前記排気管(46)が前記内燃機関(27)から車体後方へ延び、前記筒部(86)の最突出部(86c)は前記排気管本体(85)の前側に位置するようにしても良い。この構成によれば、排気管が内燃機関から車体後方へ延びているので、排気管本体とこの排気管本体の前側に位置する最突出部とが干渉しにくくなるため、最突出部を長く確保することができ、排気管本体と筒部との接合強度を高めることができるとともに接合部の応力分散効果を高めることができる。
また、上記構成において、前記排気管(46)は、車幅方向一側に配置されるマフラ(47)に接続され、前記筒部(86)の最突出部(86c)は、前記筒部(86)の最後退部(86d)よりも前記車幅方向一側に配置されても良い。この構成によれば、マフラ側から排気管に作用する振動や外力に対して、その振動や外力の方向とずれた位置に最突出部が配置されるため、最突出部への応力集中を防ぐことができる。
In the above configuration, the cylinder axis (75) extends in the vehicle longitudinal direction and tilts forward so as to be substantially horizontal, the exhaust pipe (46) extends from the internal combustion engine (27) to the rear of the vehicle body, and The most projecting portion (86c) of the tube portion (86) may be positioned on the front side of the exhaust pipe body (85). According to this configuration, since the exhaust pipe extends from the internal combustion engine to the rear of the vehicle body, the exhaust pipe body and the most projecting portion located on the front side of the exhaust pipe body are less likely to interfere with each other. It is possible to increase the bonding strength between the exhaust pipe main body and the cylindrical portion and to increase the stress dispersion effect of the bonding portion.
In the above configuration, the exhaust pipe (46) is connected to a muffler (47) disposed on one side in the vehicle width direction, and the most projecting portion (86c) of the cylinder portion (86) is connected to the cylinder portion ( 86) may be disposed on the one side in the vehicle width direction from the last retracted portion (86d). According to this configuration, since the most protruding portion is disposed at a position shifted from the direction of the vibration or external force with respect to the vibration or external force acting on the exhaust pipe from the muffler side, stress concentration on the most protruding portion is prevented. be able to.

本発明は、傾斜端面で最も突出する最突出部と最も後退する最後退部とを、フランジ部における内燃機関側の取付部への接合面に直交する方向から見たときに、最突出部と最後退部とを通る仮想線が、内燃機関のシリンダ軸線に対して傾斜しているので、シリンダ軸線が延びる方向の筒部周位置に対して最突出部と最後退部とをずらして配置することができ、シリンダ軸線の延びる方向に排気管が振動したときに、傾斜端面の最突出部に応力が集中するのを防ぐことができる上、上記振動を傾斜端面における最突出部と最後退部とを繋ぐ傾斜部で受けるようにすることで応力を効率良く分散させることができる。従って、傾斜端面形状により筒部と排気管本体との接合強度を高めながら筒部の最突出部での応力集中を防ぐことができる。   The present invention, when viewed from the direction orthogonal to the joint surface to the mounting portion on the internal combustion engine side in the flange portion, the most protruding portion that protrudes most at the inclined end surface and the most retracted portion that retracts most, Since the imaginary line passing through the last retracted part is inclined with respect to the cylinder axis of the internal combustion engine, the most projecting part and the last retracted part are arranged so as to be shifted with respect to the cylindrical part circumferential position in the direction in which the cylinder axis extends. When the exhaust pipe vibrates in the direction in which the cylinder axis extends, stress can be prevented from concentrating on the most protruding portion of the inclined end surface, and the vibration can be The stress can be efficiently dispersed by receiving it at the inclined portion connecting the two. Therefore, it is possible to prevent stress concentration at the most projecting portion of the cylindrical portion while increasing the bonding strength between the cylindrical portion and the exhaust pipe main body due to the inclined end surface shape.

また、排気管本体は、その上流端から下流側へ離れた位置に屈曲部を備え、この屈曲部の外周側寄りに筒部の最突出部が設けられているので、排気管本体の屈曲部と最突出部とが干渉しにくくなるため、最突出部を長く確保することができ、この結果、排気管本体と筒部との溶接線を長くすることができて、排気管本体と筒部との接合強度を高めることができるとともに接合部の応力分散効果を高めることができる。
また、排気管本体は、筒部内を貫通しつつ嵌合するとともに、筒部は、フランジ部内を貫通しつつ嵌合するので、排気管本体の上流端の広範囲を筒部とフランジ部とで強固に補強することができる。
Further, the exhaust pipe body includes a bent portion at a position away from the upstream end to the downstream side, and the most protruding portion of the cylindrical portion is provided near the outer peripheral side of the bent portion. And the most projecting portion are less likely to interfere with each other, so that the most projecting portion can be secured long. As a result, the weld line between the exhaust pipe body and the cylinder portion can be lengthened, and the exhaust pipe body and the cylinder portion The joint strength can be increased and the stress dispersion effect of the joint can be enhanced.
In addition, the exhaust pipe body is fitted while penetrating the inside of the cylinder part, and the cylinder part is fitted while penetrating the inside of the flange part, so that a wide range of the upstream end of the exhaust pipe body is firmly formed by the cylinder part and the flange part. Can be reinforced.

また、フランジ部と筒部の傾斜端面との間に、筒部の外周面と接合される環状の補強部材が設けられるので、補強部材を筒部の外周面に接合して筒部を補強することができる。
また、補強部材は、周方向に複数に分割され、補強部材と筒部、及び補強部材の分割部同士がそれぞれ溶接されるので、分割部の筒部への密着性を向上させることができ、補強効果を高めることができて、筒部をより一層強固に補強することができる。
Moreover, since the annular reinforcement member joined with the outer peripheral surface of a cylinder part is provided between a flange part and the inclination end surface of a cylinder part, a reinforcement member is joined to the outer peripheral surface of a cylinder part, and a cylinder part is reinforced. be able to.
Further, the reinforcing member is divided into a plurality in the circumferential direction, and the reinforcing member and the cylindrical portion, and the divided portions of the reinforcing member are welded to each other, so that the adhesion of the divided portion to the cylindrical portion can be improved, A reinforcement effect can be heightened and a cylinder part can be reinforced more firmly.

また、フランジ部は、補強部材側の面が筒部の外周面に溶接されるので、補強部材と筒部の外周面との接合部に、フランジ部の補強部材側の面と筒部の外周面との接合部を近接させることで、剛性の高い部分が接近することになり、フランジ部と補強部材との間の筒部の剛性を高めることができる。
また、フランジ部は、略ひし形に形成され、このひし形の対向する2つの頂部を通る直線上に筒部の最突出部及び最後退部が位置するので、筒部にフランジ部を取付ける際に、最突出部及び最後退部の位置を基準にして筒部に対してフランジ部を容易に位置決めすることができ、組付性を向上させることができる。
In addition, since the flange portion is welded to the outer peripheral surface of the cylindrical portion, the flange member surface is welded to the outer peripheral surface of the cylindrical portion and the reinforcing member side surface of the flange portion and the outer periphery of the cylindrical portion. By bringing the joint portion with the surface close to each other, a portion having high rigidity approaches, and the rigidity of the cylindrical portion between the flange portion and the reinforcing member can be increased.
Moreover, since the flange part is formed in a substantially rhombus, and the most projecting part and the last retracted part of the cylinder part are located on a straight line passing through two opposing tops of the rhombus, when attaching the flange part to the cylinder part, The flange portion can be easily positioned with respect to the tube portion on the basis of the positions of the most protruding portion and the most retracted portion, and the assembling property can be improved.

また、シリンダ軸線は、車両前後方向に延び且つ略水平になるように前傾し、排気管が内燃機関から車体後方へ延び、筒部の最突出部は排気管本体の前側に位置するので、排気管本体が内燃機関から屈曲して車体後方へ延びることで、排気管本体とこの排気管本体の前側に位置する最突出部とが干渉しにくくなるため、最突出部を長く確保することができ、排気管本体と筒部との接合強度を高めることができるとともに接合部の応力分散効果を高めることができる。
また、排気管は、車幅方向一側に配置されるマフラに接続され、筒部の最突出部は、筒部の最後退部よりも車幅方向一側に配置されるので、マフラ側からの排気管に作用する振動や外力に対して、その振動や外力の方向とずれた位置に最突出部が配置されるため、最突出部への応力集中を防ぐことができる。
Also, the cylinder axis extends in the vehicle longitudinal direction and tilts forward so as to be substantially horizontal, the exhaust pipe extends from the internal combustion engine to the rear of the vehicle body, and the most projecting part of the cylinder part is located on the front side of the exhaust pipe body. Since the exhaust pipe body is bent from the internal combustion engine and extends toward the rear of the vehicle body, the exhaust pipe body and the most projecting portion located on the front side of the exhaust pipe body are less likely to interfere with each other. In addition, it is possible to increase the bonding strength between the exhaust pipe main body and the cylinder portion and to increase the stress dispersion effect of the bonding portion.
Further, the exhaust pipe is connected to a muffler disposed on one side in the vehicle width direction, and the most projecting portion of the tubular portion is disposed on the one side in the vehicle width direction from the last retracted portion of the tubular portion. With respect to vibration and external force acting on the exhaust pipe, the most protruding portion is disposed at a position deviated from the direction of the vibration or external force, so stress concentration on the most protruding portion can be prevented.

本発明の実施形態を適用した自動二輪車を示す左側面図である。1 is a left side view showing a motorcycle to which an embodiment of the present invention is applied. 自動二輪車の後部を示す左側面図である。Fig. 3 is a left side view showing a rear part of the motorcycle. 排気装置の要部を示す左側面図である。It is a left view which shows the principal part of an exhaust apparatus. 自動二輪車の下部を示す正面図である。It is a front view which shows the lower part of a motorcycle. 図2の5矢視図である。FIG. 5 is a view taken in the direction of arrow 5 in FIG. 2. 排気管を示す下面図である。It is a bottom view which shows an exhaust pipe. 排気管の要部を示す説明図である。It is explanatory drawing which shows the principal part of an exhaust pipe. 排気管取付部の組付要領を示す作用図である。It is an effect | action figure which shows the assembly | attachment point of an exhaust pipe attachment part.

以下、図面を参照して本発明の一実施の形態について説明する。なお、説明中、前後左右および上下といった方向の記載は、特に記載がなければ車体に対する方向と同一とする。また、各図に示す符号FRは車体前方を示し、符号UPは車体上方を示し、符号LEは車体左方を示している。
図1は、本発明の実施形態を適用した自動二輪車10を示す左側面図である。
自動二輪車10は、骨格となる車体フレーム11が、その前端部に設けられたヘッドパイプ12と、このヘッドパイプ12から下方斜め後方に延びるメインフレーム13と、このメインフレーム13の下部から左右の後方そして後方斜め上方に延びる左右一対のアンダーフレーム14,14(手前側の符号14のみ図示)と、これらのアンダーフレーム14,14の後端部に取付けられて後方斜め上方に延びるリヤフレーム16とから構成され、ヘッドパイプ12に操舵自在にフロントフォーク21が取付けられ、このフロントフォーク21の下端に車軸22を介して前輪23が回転自在に取付けられ、フロントフォーク21の上端部にバーハンドル24が取付けられ、アンダーフレーム14,14にリンク26を介してエンジン27及び無段変速機28からなるパワーユニット30が上下揺動自在に取付けられ、無段変速機28の後端部に回転自在に後輪31が取付けられ、リヤフレーム16及び無段変速機28のそれぞれにリヤクッションユニット32が渡して取付けられ、リヤフレーム16の上部にタンデムシート33が取付けられ、車体フレーム11の側方及びフロントフォーク21の前方が車体カバー34で覆われたスクータ型車両である。
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description, descriptions of directions such as front and rear, right and left and up and down are the same as directions with respect to the vehicle body unless otherwise specified. Further, in each figure, the symbol FR indicates the front of the vehicle body, the symbol UP indicates the upper side of the vehicle body, and the symbol LE indicates the left side of the vehicle body.
FIG. 1 is a left side view showing a motorcycle 10 to which an embodiment of the present invention is applied.
The motorcycle 10 has a body frame 11 serving as a skeleton, a head pipe 12 provided at a front end portion thereof, a main frame 13 extending obliquely rearwardly downward from the head pipe 12, and a left and right rear side from a lower portion of the main frame 13. Then, a pair of left and right underframes 14 and 14 (only reference numeral 14 on the front side is shown) extending obliquely rearward and upward, and a rear frame 16 attached to the rear end portion of these underframes 14 and 14 and extending obliquely rearward and upward. The front fork 21 is configured to be steerable to the head pipe 12, the front wheel 23 is rotatably mounted to the lower end of the front fork 21 via the axle 22, and the bar handle 24 is mounted to the upper end of the front fork 21. The engine 27 and the non-frame are connected to the underframes 14 and 14 via links 26. A power unit 30 composed of a transmission 28 is mounted so as to be swingable up and down, and a rear wheel 31 is rotatably mounted on a rear end portion of the continuously variable transmission 28. A rear cushion is provided on each of the rear frame 16 and the continuously variable transmission 28. This is a scooter type vehicle in which a unit 32 is mounted and mounted, a tandem seat 33 is mounted on the upper portion of the rear frame 16, and the side of the vehicle body frame 11 and the front of the front fork 21 are covered with a vehicle body cover 34.

エンジン27は、前方にほぼ水平に突出するシリンダ部37を備え、このシリンダ部37の上部に吸気装置41、下部に排気装置42がそれぞれ接続されている。
吸気装置41は、パワーユニット30の上部に取付けられたエアクリーナ44を備え、排気装置42は、シリンダ部37のシリンダヘッドに接続された排気管46と、この排気管の後端に接続されたマフラ47とからなる。
車体カバー34は、フロントフォーク21の前方を覆うフロントカバー51と、このフロントカバー51の側部から後方に連続して延びる左右のフロントサイドカバー52,52(手前側の符号52のみ図示)と、これらのフロントサイドカバー52,52の後縁を左右に接続するとともにヘッドパイプ12の後方を覆うインナーカバー53と、このインナーカバー53から後方及び下方に連続するように延びて乗員の足載せ部を形成するフロアステップ54と、このフロアステップ54の両側縁から下方を覆う左右のアンダーカバー56,56(手前側の符号56のみ図示)と、フロアステップ54の後方でタンデムシート33の両側部の下方を覆う左右のリヤサイドカバー57,57(手前側の符号57のみ図示)とからなる。
ここで、符号61はメータバイザ、62はバックミラー、63は前輪23の上方を覆うフロントフェンダ、64はサイドスタンド、66はタンデムシート33の後部に乗車した同乗者が掴むグラブレール、67はリヤコンビネーションランプ、68は後輪31の上方を覆うリヤフェンダである。
The engine 27 includes a cylinder portion 37 that projects substantially horizontally forward, and an intake device 41 is connected to the upper portion of the cylinder portion 37 and an exhaust device 42 is connected to the lower portion.
The intake device 41 includes an air cleaner 44 attached to the upper portion of the power unit 30, and the exhaust device 42 includes an exhaust pipe 46 connected to the cylinder head of the cylinder portion 37 and a muffler 47 connected to the rear end of the exhaust pipe. It consists of.
The vehicle body cover 34 includes a front cover 51 covering the front of the front fork 21, left and right front side covers 52, 52 (only the reference numeral 52 on the front side is shown) extending continuously from the side of the front cover 51 to the rear, An inner cover 53 that connects the rear edges of the front side covers 52, 52 to the left and right and covers the rear of the head pipe 12, and extends from the inner cover 53 so as to be continuous rearward and downward, so The floor step 54 to be formed, the left and right under covers 56, 56 (only the reference numeral 56 on the near side is shown) covering the lower side from both side edges of the floor step 54, and the lower side of the tandem seat 33 behind the floor step 54 Left and right rear side covers 57, 57 (only the reference numeral 57 on the front side is shown).
Here, reference numeral 61 is a meter visor, 62 is a rearview mirror, 63 is a front fender that covers the upper side of the front wheel 23, 64 is a side stand, 66 is a grab rail gripped by a passenger who rides on the rear part of the tandem seat 33, and 67 is a rear combination lamp. , 68 is a rear fender that covers the upper portion of the rear wheel 31.

図2は、自動二輪車10の後部を示す左側面図である。
パワーユニット30の前部を構成するエンジン27は、クランクケース71と、このクランクケース71の前端に取付けられたシリンダブロック72と、このシリンダブロック72の前端に取付けられたシリンダヘッド73と、このシリンダヘッド73の前端の開口を覆うヘッドカバー74とを備え、上記シリンダブロック72、シリンダヘッド73及びヘッドカバー74は、シリンダ部37を構成する部品である。
シリンダブロック72は、内部にピストンを移動自在に収容するシリンダボアが形成され、このシリンダボアの軸線をシリンダ軸線75とすると、シリンダ軸線75はほぼ水平に車体前後方向に延びている。
シリンダヘッド73は、その下部に排気ガスを排出する排気口77を備える。排気口77は、その先端部に排気管46の上流端に設けられた排気管取付部81を締結するための一対のスタッドボルト(不図示)が設けられている。
排気管46は、シリンダヘッド73に締結された排気管取付部81から下方に延び、そして車体後側へ屈曲し、後方斜め上方に延びてマフラ47に接続されている。
FIG. 2 is a left side view showing the rear part of the motorcycle 10.
The engine 27 constituting the front portion of the power unit 30 includes a crankcase 71, a cylinder block 72 attached to the front end of the crankcase 71, a cylinder head 73 attached to the front end of the cylinder block 72, and the cylinder head. The cylinder block 72, the cylinder head 73, and the head cover 74 are components constituting the cylinder portion 37.
The cylinder block 72 has a cylinder bore in which a piston is movably accommodated. If the axis of the cylinder bore is a cylinder axis 75, the cylinder axis 75 extends substantially horizontally in the longitudinal direction of the vehicle body.
The cylinder head 73 includes an exhaust port 77 for discharging exhaust gas at a lower portion thereof. The exhaust port 77 is provided with a pair of stud bolts (not shown) for fastening an exhaust pipe mounting portion 81 provided at the upstream end of the exhaust pipe 46 at the tip thereof.
The exhaust pipe 46 extends downward from an exhaust pipe mounting portion 81 fastened to the cylinder head 73, bends toward the rear side of the vehicle body, extends obliquely rearward and upward, and is connected to the muffler 47.

図3は、排気装置42の要部を示す左側面図であり、図2に示した排気装置42を抜書きした図である。
排気管46は、管状の排気管本体85と、この排気管本体85の上流端の外周面に嵌合された筒部86と、この筒部86の外周面に取付けられた板状のフランジ部87及び環状の補強部材88とからなり、排気管本体85の上流端、筒部86、フランジ部87及び補強部材88は、排気管取付部81を構成している。
排気管本体85は、その端面85aが筒部86を貫通して筒部86の一端面86aから外部に突出し、排気管取付部81から下方に離れた位置に、ほぼ直角に車体後方へ屈曲する屈曲部85bを有する。
FIG. 3 is a left side view showing a main part of the exhaust device 42, and is a diagram in which the exhaust device 42 shown in FIG. 2 is extracted.
The exhaust pipe 46 includes a tubular exhaust pipe main body 85, a cylindrical portion 86 fitted to the outer peripheral surface of the upstream end of the exhaust pipe main body 85, and a plate-like flange portion attached to the outer peripheral surface of the cylindrical portion 86. 87 and an annular reinforcing member 88, and the upstream end of the exhaust pipe main body 85, the cylinder part 86, the flange part 87 and the reinforcing member 88 constitute an exhaust pipe attachment part 81.
The exhaust pipe main body 85 has an end surface 85a that penetrates the cylindrical portion 86 and protrudes from the one end surface 86a of the cylindrical portion 86 to the outside, and bends to the rear of the vehicle body at a substantially right angle at a position away from the exhaust pipe mounting portion 81. It has a bent portion 85b.

筒部86は、排気管本体85の上流端を補強する部材であり、その他端面が傾斜した傾斜端面86bとなっている。傾斜端面86bは、筒を斜めに切断したときと同様な楕円形又は楕円形に近い形状を成す部分であり、傾斜端面86bにおいて、下方に最も突出する部分が最突出部86c、最も上方に位置する部分が最後退部86dであり、最突出部86cは排気管本体85の車体前方側、詳しくは最も車体前方側よりやや後方に位置し、最後退部86dは排気管本体85の車体後方側、詳しくは最も車体後方側よりやや前方に位置している。また、最突出部86cは、排気管本体85の屈曲部85bにおける外周部85f寄りに設けられている。屈曲部85bの上方の排気管本体85は、曲げ加工時にわずかに車体後方に屈曲していることがあり、最突出部86cを排気管本体85の前側に設けることで、排気管本体85に筒部86が組み付けられた状態での最突出部86cと排気管本体85の前側との当りを弱める又は無くすことができ、組付性の向上と応力低減とを図ることができる。なお、符号85gは屈曲部85bの内周部である。
このような傾斜端面86bを設けることで、筒をその長手方向に直交する方向に切断して端面を円形又は円形に近い形状に形成した場合に比べて、傾斜端面86bと排気管本体85の外周面とを連続溶接する際の溶接線を長くすることができ、排気管本体85と筒部86との接合強度を高めることができる。
The cylindrical portion 86 is a member that reinforces the upstream end of the exhaust pipe main body 85, and has an inclined end surface 86b whose other end surface is inclined. The inclined end surface 86b is a portion having an elliptical shape or a shape close to an elliptical shape similar to that obtained when the tube is cut obliquely, and the portion of the inclined end surface 86b that protrudes most downward is the most protruding portion 86c, and is positioned most upward. The most retracted portion 86d is located at the front side of the exhaust pipe main body 85, more specifically, slightly rearward from the front side of the vehicle body, and the last retracted portion 86d is the rear side of the exhaust pipe main body 85. Specifically, it is located slightly forward from the rear side of the vehicle body. Further, the most projecting portion 86 c is provided near the outer peripheral portion 85 f of the bent portion 85 b of the exhaust pipe main body 85. The exhaust pipe main body 85 above the bent portion 85b may be bent slightly toward the rear of the vehicle body during bending, and the exhaust pipe main body 85 is provided with the most protruding portion 86c on the front side of the exhaust pipe main body 85. The contact between the most protruding portion 86c and the front side of the exhaust pipe main body 85 in a state where the portion 86 is assembled can be weakened or eliminated, and the assembling property can be improved and the stress can be reduced. Reference numeral 85g denotes an inner peripheral portion of the bent portion 85b.
By providing such an inclined end surface 86b, the outer periphery of the inclined end surface 86b and the exhaust pipe main body 85 is compared with the case where the end surface is formed in a circular shape or a shape close to a circle by cutting the tube in a direction perpendicular to the longitudinal direction. The weld line when continuously welding the surfaces can be lengthened, and the joining strength between the exhaust pipe main body 85 and the cylindrical portion 86 can be increased.

フランジ部87は、筒部86の一端面86a寄りに取付けられた部材である。
補強部材88は、周方向に2分割された筒状部材で、断面が半円の分割部88a,88aからなり、フランジ部87と傾斜端面86bとの間の筒部86に取付けられ、筒部86を補強している。仮に、周方向に分割していない補強部材を使用すると、筒部86及び補強部材のそれぞれの真円度のばらつきによって、筒部86に補強部材を嵌合させたときに隙間が生じ、密着しない状態で接合される場合があり、接合強度が低下するおそれがある。これに対して、補強部材88を2分割に分割することで、上記真円度にばらつきがある場合でも、筒部86と各分割部88aとの密着性が良くなり、接合強度を高めることができる。
以上のように、排気管取付部81は、筒部86及び補強部材88で補強されることで、エンジン振動に対する強度が高められ、耐久性が確保されている。
The flange portion 87 is a member attached near the one end face 86 a of the cylindrical portion 86.
The reinforcing member 88 is a cylindrical member that is divided into two in the circumferential direction. The reinforcing member 88 includes divided portions 88a and 88a having a semicircular cross section. The reinforcing member 88 is attached to the cylindrical portion 86 between the flange portion 87 and the inclined end surface 86b. 86 is reinforced. If a reinforcing member that is not divided in the circumferential direction is used, a gap occurs when the reinforcing member is fitted to the cylindrical portion 86 due to variations in roundness of the cylindrical portion 86 and the reinforcing member, and does not adhere to each other. May be joined in a state, and the joining strength may be reduced. On the other hand, by dividing the reinforcing member 88 into two parts, even when the roundness varies, the adhesion between the cylindrical part 86 and each divided part 88a is improved, and the bonding strength is increased. it can.
As described above, the exhaust pipe attachment portion 81 is reinforced by the cylindrical portion 86 and the reinforcing member 88, whereby the strength against engine vibration is increased and durability is ensured.

図4は、自動二輪車10の下部を示す正面図である。
排気管46は、シリンダヘッド73の排気口77から下方に延び、そして屈曲して車体右方へ延び、車体右側方に配置されたマフラ47に接続されている。
排気管取付部81の最突出部86cは、筒部86の軸線86Eよりも右側に位置している。
排気管取付部81のシリンダヘッド73への組付けは、シリンダヘッド73の排気口77に設けられた一対のスタッドボルトに、フランジ部87に形成された一対のボルト挿通穴87a,87a(図7(B)参照)を嵌合し、これら一対のスタッドボルトにそれぞれナット91をねじ込み、これらのナット91,91でフランジ部87を締め込むことで行われる。なお、符号92はパワーユニット30の下部に取付けられたメインスタンドである。
FIG. 4 is a front view showing the lower part of the motorcycle 10.
The exhaust pipe 46 extends downward from the exhaust port 77 of the cylinder head 73, bends and extends to the right side of the vehicle body, and is connected to a muffler 47 disposed on the right side of the vehicle body.
The most protruding portion 86 c of the exhaust pipe mounting portion 81 is located on the right side of the axis 86 </ b> E of the cylindrical portion 86.
The exhaust pipe mounting portion 81 is assembled to the cylinder head 73 by attaching a pair of bolt insertion holes 87a, 87a (see FIG. 7) formed in the flange portion 87 to a pair of stud bolts provided in the exhaust port 77 of the cylinder head 73. (See (B)), the nut 91 is screwed into each of the pair of stud bolts, and the flange portion 87 is tightened with the nuts 91 and 91. Reference numeral 92 denotes a main stand attached to the lower part of the power unit 30.

図5は、図2の5矢視図であり、筒部86の軸線86Eの延びる方向、即ち、フランジ部87におけるエンジン27の排気口77への接合面である上面87c(図7(A)参照)に直交する方向から見た図である。
自動二輪車10のパワーユニット30は、後輪31の車体前方に配置されたエンジン27と、エンジン27から後輪31の左側方まで延びる無段変速機28とからなり、パワーユニット30の右側部にマフラ支持ステー98が取付けられ、このマフラ支持ステー98で後輪31の右側方に配置されたマフラ47が支持されている。
排気管46は、シリンダヘッド73に取付けられた排気管取付部81から車体後方斜め右方に屈曲しながら延びてマフラ47の先端部に接続されている。図中の符号95は、排気管46において、排気管取付部81(詳しくは、筒部86の軸線86E)とマフラ47への接続部の車幅方向中央(詳しくは、排気管本体85の後端部85hの軸線85Jとマフラ47の先端面47aとが交わる位置)とを通る直線、100は前輪23(図1参照)及び後輪31のそれぞれの幅の中央を通って車体前後方向に延びる車体中心線である。
5 is a view taken in the direction of the arrow 5 in FIG. 2, and is an upper surface 87c (FIG. 7A) which is a direction in which the axis 86E of the cylindrical portion 86 extends, that is, a joint surface of the flange portion 87 to the exhaust port 77 of the engine 27. It is the figure seen from the direction orthogonal to reference.
The power unit 30 of the motorcycle 10 includes an engine 27 disposed in front of the rear wheel 31 and a continuously variable transmission 28 extending from the engine 27 to the left side of the rear wheel 31. A muffler is supported on the right side of the power unit 30. A stay 98 is attached, and a muffler 47 disposed on the right side of the rear wheel 31 is supported by the muffler support stay 98.
The exhaust pipe 46 extends from the exhaust pipe attachment portion 81 attached to the cylinder head 73 while being bent obliquely to the right rear of the vehicle body, and is connected to the tip portion of the muffler 47. In the exhaust pipe 46, reference numeral 95 in the figure denotes the exhaust pipe mounting portion 81 (specifically, the axis 86 </ b> E of the cylindrical portion 86) and the center in the vehicle width direction of the connecting portion to the muffler 47 (specifically, the rear of the exhaust pipe main body 85 A straight line 100 passing through the axis 85J of the end portion 85h and the position where the tip surface 47a of the muffler 47 intersects, and 100 extends in the longitudinal direction of the vehicle body through the center of each width of the front wheel 23 (see FIG. 1) and the rear wheel 31. It is the car body center line.

図6は、排気管46を示す下面図であり、図5に示した排気管46とマフラ47の一部とを抜書きした図である。なお、図中では、筒部86の最突出部86c及び最後退部86dの位置の理解を容易にするために最突出部86c及び最後退部86dに黒丸又は破線の白丸を付けている。
直線95とシリンダ軸線75となす角度を角度θ1とする。
排気管取付部81の最突出部86cと最後退部86dとを通る仮想線を97とすると、仮想線97は、シリンダ軸線75に対して角度θ2だけ傾斜している。即ち、最突出部86cと最後退部86dとは、シリンダ軸線75の延びる方向に並んでおらず、また、最突出部86cは、筒部86の最も車体前側の部分よりやや後側で且つ右側にずれている。
FIG. 6 is a bottom view showing the exhaust pipe 46, and is a diagram in which the exhaust pipe 46 and a part of the muffler 47 shown in FIG. In the drawing, in order to facilitate understanding of the positions of the most projecting portion 86c and the most retracted portion 86d of the cylindrical portion 86, the most projecting portion 86c and the most retracted portion 86d are marked with black circles or white circles with broken lines.
An angle between the straight line 95 and the cylinder axis 75 is an angle θ1.
Assuming that a virtual line passing through the most projecting portion 86c and the most retracted portion 86d of the exhaust pipe mounting portion 81 is 97, the virtual line 97 is inclined with respect to the cylinder axis 75 by an angle θ2. That is, the most projecting portion 86c and the most retracted portion 86d are not aligned in the direction in which the cylinder axis 75 extends, and the most projecting portion 86c is slightly rearward and more rightward than the most front portion of the cylinder portion 86. It is shifted to.

ここで仮に、仮想線97がシリンダ軸線75と平行になっている場合には、最突出部86cと最後退部86dとが車体前後方向に並ぶことになり、シリンダ軸線75の延びる車体前後方向にエンジン27が振動すると、これに伴ってエンジン27と排気管46とに車体前後方向の相対移動が発生し、排気管取付部81に車体前後方向の曲げ力が作用する。この結果、筒部86の最も車体前側に位置する最突出部86c、詳しくは最突出部86cと排気管本体85の外周面との接合部に大きな曲げ力が作用してこの部分に応力が集中することになる。これを防ぐために、本実施形態では、仮想線97をシリンダ軸線75に対して傾斜させ、最突出部86cを筒部86の最も車体前側からずらすことで、最突出部86cに大きな曲げ力が作用しないようにして最突出部86cでの応力集中を防いでいる。傾斜端面86bのうちで最も車体前側に位置する部分は傾斜した面なので、応力が集中せず分散しやすい。   Here, if the virtual line 97 is parallel to the cylinder axis 75, the most projecting portion 86c and the most retracted portion 86d are aligned in the vehicle body front-rear direction, so that the cylinder axis 75 extends in the vehicle front-rear direction. When the engine 27 vibrates, a relative movement in the longitudinal direction of the vehicle body occurs between the engine 27 and the exhaust pipe 46, and a bending force in the longitudinal direction of the vehicle body acts on the exhaust pipe mounting portion 81. As a result, a large bending force acts on the most projecting portion 86c located on the most front side of the vehicle body of the cylinder portion 86, more specifically, the joint portion between the most projecting portion 86c and the outer peripheral surface of the exhaust pipe body 85, and stress is concentrated on this portion. Will do. In order to prevent this, in this embodiment, the imaginary line 97 is inclined with respect to the cylinder axis line 75, and the most projecting portion 86c is shifted from the front side of the body of the cylinder portion 86, so that a large bending force acts on the most projecting portion 86c. In this way, stress concentration at the most protruding portion 86c is prevented. Since the portion of the inclined end face 86b located closest to the front of the vehicle body is an inclined surface, stress is not concentrated and is easily dispersed.

また、排気管取付部81には、車体右側に位置するマフラ47側から直線95に沿ってエンジン振動や車体振動による引張力や圧縮力が作用するが、最後退部86dよりも最突出部86cは車体右側に位置するので、最突出部86cは上記引張力や圧縮力の方向から外れているため、この点からも最突出部86cに曲げ力が作用しにくくなり、応力集中しにくくなっている。
シリンダ軸線75は、車体中心線100に対して左側にオフセット量δ1だけオフセットして設けられ、また、筒部86の軸線86E(黒丸で示す部分)は、シリンダ軸線75に対して右側にオフセット量δ2だけオフセットして設けられている。
Further, the exhaust pipe mounting portion 81 is subjected to a tensile force or a compressive force due to engine vibration or vehicle body vibration along a straight line 95 from the muffler 47 side located on the right side of the vehicle body, but the most projecting portion 86c than the last retracted portion 86d. Is located on the right side of the vehicle body, so that the most projecting portion 86c deviates from the direction of the tensile force or compression force. From this point as well, bending force is less likely to act on the most projecting portion 86c, and stress concentration is less likely to occur. Yes.
The cylinder axis 75 is provided offset to the left by an offset amount δ1 with respect to the vehicle body center line 100, and the axis 86E (portion indicated by a black circle) of the cylinder 86 is offset to the right with respect to the cylinder axis 75. The offset is provided by δ2.

図7は、排気管46の要部を示す説明図であり、図7(A)は排気管46の要部の側面図、図7(B)は図7(A)のB矢視図、図7(C)は図7(A)のC矢視図、図7(D)は図7(C)のD矢視図(ただし、排気管本体85は省略)である。
図7(A)に示すように、排気管46は、排気管取付部81の下流側(マフラ47(図6参照)側)の排気管本体85に、ほぼ直角に屈曲する屈曲部85bが形成されている。
フランジ部87は、板状の部材であり、板の上面87cが排気口77(図4参照)に接合される接合面となる。
補強部材88は、2つの分割部88a,88aからなり、これらの分割部88a,88aの2つの合せ部88b,88b(手前側の符号88bのみ図示)は、周方向で180°間隔で設けられ、最突出部86c及び最後退部86dのそれぞれの位置に合うように設けられている。このように、最突出部86c及び最後退部86dに合せ部88b,88bをそれぞれ合わせるようにすることで、最突出部86c及び最後退部86dの位置を基準にして筒部86に分割部88a,88aを容易に組み付けることができる。
FIG. 7 is an explanatory view showing the main part of the exhaust pipe 46, FIG. 7 (A) is a side view of the main part of the exhaust pipe 46, FIG. 7 (B) is a view as seen from the arrow B in FIG. FIG. 7C is a view taken in the direction of arrow C in FIG. 7A, and FIG. 7D is a view taken in the direction of arrow D in FIG. 7C (however, the exhaust pipe body 85 is omitted).
As shown in FIG. 7A, the exhaust pipe 46 is formed with a bent portion 85b that is bent substantially at right angles to the exhaust pipe main body 85 on the downstream side (the muffler 47 (see FIG. 6) side) of the exhaust pipe mounting portion 81. Has been.
The flange portion 87 is a plate-like member, and the upper surface 87c of the plate serves as a joint surface joined to the exhaust port 77 (see FIG. 4).
The reinforcing member 88 includes two divided portions 88a and 88a, and two mating portions 88b and 88b (only the reference numeral 88b on the front side is shown) of these divided portions 88a and 88a are provided at intervals of 180 ° in the circumferential direction. The most protruding portion 86c and the most retracted portion 86d are provided so as to match the respective positions. In this way, by aligning the mating portions 88b and 88b with the most projecting portion 86c and the most retracted portion 86d, respectively, the dividing portion 88a is formed on the cylindrical portion 86 with reference to the positions of the most projecting portion 86c and the most retracted portion 86d. , 88a can be easily assembled.

図7(B)に示すように、フランジ部87は、略ひし形に形成され、ひし形の2本の対角線のうち、長い対角線に重なるように設けられた中心線102上にはシリンダヘッド73(図5参照)側のスタッドボルトを通す一対のボルト挿通穴87a,87aが開けられ、短い対角線に重なるように設けられた中心線103上には筒部86の最突出部86c及び最後退部86dが配置されている。中心線103は仮想線97に一致し、中心線102と中心線103とは直交している。   As shown in FIG. 7B, the flange portion 87 is formed in a substantially rhombus shape, and a cylinder head 73 (see FIG. 7) is formed on a center line 102 provided so as to overlap a long diagonal line of the two diagonal lines of the rhombus. 5)) A pair of bolt insertion holes 87a, 87a through which the stud bolts on the side are passed are opened, and on the center line 103 provided so as to overlap the short diagonal line, the most projecting portion 86c and the most backward retracting portion 86d of the cylindrical portion 86 are formed. Has been placed. The center line 103 coincides with the virtual line 97, and the center line 102 and the center line 103 are orthogonal to each other.

最突出部86c及び最後退部86dを通る中心線103は、シリンダ軸線75に対して角度θ2だけ傾斜し、シリンダ軸線75と平行で筒部86の軸線86Eを通る直線105から外れた位置に最突出部86cが設けられている。即ち、直線105と傾斜端面86bとが交差する部分(筒部86の周方向の位置)は、傾斜端面86bの最突出部86cと最後退部86dとを除いた傾斜部86p,86qであり、これらのシリンダ軸線75が延びる方向の筒部86の周方向の位置に対して最突出部86cと最後退部86dとがずれて配置されている。   The center line 103 passing through the most projecting portion 86c and the most retracted portion 86d is inclined at an angle θ2 with respect to the cylinder axis 75, and is at a position away from a straight line 105 that is parallel to the cylinder axis 75 and passes through the axis 86E of the cylinder portion 86. A protruding portion 86c is provided. That is, the portion where the straight line 105 and the inclined end surface 86b intersect (the position in the circumferential direction of the cylindrical portion 86) is the inclined portions 86p and 86q excluding the most protruding portion 86c and the last retracted portion 86d of the inclined end surface 86b. The most projecting portion 86c and the most retracted portion 86d are displaced from the circumferential position of the cylindrical portion 86 in the direction in which the cylinder axis 75 extends.

図7(C),(D)に示すように、筒部86の傾斜端面86bは、筒部材を斜めに一直線状に切断して全体が一つの平面に含まれるように形成された部分であり、筒部86の軸線86Eに対して角度θ3だけ傾斜している。
傾斜端面86bと筒部86の外周面86g及び内周面86hとが交差する部分には楕円86M,86Nが形成される。例えば、一方の楕円86Nでは107が長軸、108が短軸となり、長軸107の延長上に最突出部86c及び最後退部86dが位置している。
As shown in FIGS. 7C and 7D, the inclined end surface 86b of the cylindrical portion 86 is a portion formed by cutting the cylindrical member obliquely in a straight line so that the whole is included in one plane. The cylinder portion 86 is inclined by an angle θ3 with respect to the axis 86E.
Ellipses 86M and 86N are formed at portions where the inclined end surface 86b intersects the outer peripheral surface 86g and the inner peripheral surface 86h of the cylindrical portion 86. For example, in one ellipse 86N, 107 is the long axis and 108 is the short axis, and the most projecting portion 86c and the most retracted portion 86d are located on the extension of the long shaft 107.

図8は、排気管取付部81の組付要領を示す作用図であり、図8(A)は筒部86の組付けを説明する作用図、図8(B)は補強部材88の組付けを説明する作用図、図8(C)はフランジ部87の組付けを説明する作用図である。
図8(A)に示すように、排気管本体85の外周面85dに筒部86を嵌合させる。このとき、排気管本体85は、筒部86を貫通し、筒部86の一端面86aから端面85aがわずかに突出するようにする。
そして、筒部86の傾斜端面86bと排気管本体85の外周面85dとを例えばアーク放電を利用して連続すみ肉溶接にて接合する。
FIGS. 8A and 8B are operation diagrams showing the assembly procedure of the exhaust pipe mounting portion 81. FIG. 8A is an operation diagram for explaining the assembly of the cylindrical portion 86, and FIG. FIG. 8C is an operation diagram for explaining the assembly of the flange portion 87.
As shown in FIG. 8A, the cylindrical portion 86 is fitted to the outer peripheral surface 85 d of the exhaust pipe main body 85. At this time, the exhaust pipe main body 85 penetrates the tube portion 86 so that the end surface 85a slightly protrudes from the one end surface 86a of the tube portion 86.
And the inclined end surface 86b of the cylinder part 86 and the outer peripheral surface 85d of the exhaust pipe main body 85 are joined by continuous fillet welding using, for example, arc discharge.

次に、図8(B)に示すように、2つ割りの補強部材88の各分割部88aを筒部86の外周面86gに当て、まず、2つの分割部88a,88aの傾斜端面86bとは反対側のそれぞれの一端面88c,88c(手前側の符号88cのみ図示)と筒部86の外周面86gとを連続すみ肉溶接にて接合する。その後、例えば、分割部88a同士の接合面2か所にI形開先(溝)を形成し、開先溶接により分割部88a同士を接合する。分割部88a同士を接合した部分は合せ部88b,88b(図7(A)参照。一方の符号88bのみ示す。)となる。   Next, as shown in FIG. 8B, each divided portion 88a of the split reinforcing member 88 is applied to the outer peripheral surface 86g of the cylindrical portion 86. First, the inclined end surfaces 86b of the two divided portions 88a and 88a Are joined to the opposite end surfaces 88c, 88c (only the reference numeral 88c on the near side is shown) and the outer peripheral surface 86g of the cylindrical portion 86 by continuous fillet welding. Thereafter, for example, I-shaped grooves (grooves) are formed at two joint surfaces of the divided portions 88a, and the divided portions 88a are joined by groove welding. The portions where the divided portions 88a are joined together are the matching portions 88b and 88b (see FIG. 7A), where only one symbol 88b is shown).

次に、図8(C)に示すように、フランジ部87の中央に開けられた嵌合面(不図示)を筒部86に一端面86a側から嵌合させる。このとき、筒部86がフランジ部87を貫通し、筒部86の一端面86aをフランジ部87から外部に突出させるようにするとともにフランジ部87と補強部材88との距離を所定範囲内に保つ。そして、フランジ部87の補強部材88側の下面87dと筒部86の外周面86gとを連続すみ肉溶接で接合する。これで、排気管取付部81の組付けが完了する。
上記のように、フランジ部87と補強部材88とは接近しているため、補強部材88と筒部86との溶接部に、フランジ部87と筒部86との溶接部が隣接するので、補強部材88、筒部86及びフランジ部87が一体的になり、補強部材88、フランジ部87間の筒部86の強度を向上させることができる。この結果、排気管取付部81の強度をより一層高めることができる。
Next, as shown in FIG. 8C, a fitting surface (not shown) opened at the center of the flange portion 87 is fitted to the cylindrical portion 86 from the one end face 86a side. At this time, the cylindrical portion 86 penetrates the flange portion 87 so that one end face 86a of the cylindrical portion 86 protrudes outside from the flange portion 87, and the distance between the flange portion 87 and the reinforcing member 88 is kept within a predetermined range. . And the lower surface 87d by the side of the reinforcement member 88 of the flange part 87 and the outer peripheral surface 86g of the cylinder part 86 are joined by continuous fillet welding. This completes the assembly of the exhaust pipe mounting portion 81.
As described above, since the flange portion 87 and the reinforcing member 88 are close to each other, the welded portion between the flange portion 87 and the tubular portion 86 is adjacent to the welded portion between the reinforcing member 88 and the tubular portion 86, so that the reinforcement is performed. The member 88, the cylindrical portion 86, and the flange portion 87 are integrated, and the strength of the cylindrical portion 86 between the reinforcing member 88 and the flange portion 87 can be improved. As a result, the strength of the exhaust pipe attachment portion 81 can be further increased.

以上の図2、図3、図6、図7(B),(D)に示したように、エンジン27に接続される排気管46が、管状の排気管本体85と、この排気管本体85の上流端に取付けられる筒部86と、この筒部86に設けられてエンジン27側の取付部としての排気口77に接続されるフランジ部87とを備え、筒部86は該筒部86の軸線86Eに対して傾斜した傾斜端面86bを有し、この傾斜端面86bが排気管本体85の外周面85dに接合される内燃機関の排気管構造において、傾斜端面86bで最も突出する最突出部86cと最も後退する最後退部86dとを、フランジ部87におけるエンジン27側の排気口77への接合面としての上面87cに直交する方向から見たときに、最突出部86cと最後退部86dとを通る仮想線97が、エンジン27のシリンダ軸線75に対して傾斜しているので、シリンダ軸線75が延びる方向の筒部86の周位置に対して最突出部86cと最後退部86dとをずらして配置することができ、シリンダ軸線75の延びる方向に排気管46が振動したときに、傾斜端面86bの最突出部86cに応力が集中するのを防ぐことができる上、上記振動を傾斜端面86bにおける最突出部86cと最後退部86dとを繋ぐ傾斜部86pで受けるようにすることで応力を効率良く分散させることができる。従って、傾斜端面86bの形状により筒部86と排気管本体85との接合強度を高めながら筒部86の最突出部86cでの応力集中を防ぐことができる。   As shown in FIGS. 2, 3, 6, 7 (B), and (D), the exhaust pipe 46 connected to the engine 27 includes a tubular exhaust pipe main body 85 and the exhaust pipe main body 85. And a flange portion 87 provided on the cylinder portion 86 and connected to an exhaust port 77 as an attachment portion on the engine 27 side. In the exhaust pipe structure of the internal combustion engine having an inclined end face 86b inclined with respect to the axis 86E, and this inclined end face 86b is joined to the outer peripheral face 85d of the exhaust pipe main body 85, the most protruding portion 86c that protrudes most at the inclined end face 86b. And the most retracted portion 86d that is most retracted when viewed from a direction orthogonal to the upper surface 87c as a joint surface to the exhaust port 77 on the engine 27 side in the flange portion 87, An imaginary line 97 passing through Since it is inclined with respect to the cylinder axis 75 of the engine 27, the most projecting portion 86c and the most retracted portion 86d can be shifted from the circumferential position of the cylindrical portion 86 in the direction in which the cylinder axis 75 extends. When the exhaust pipe 46 vibrates in the direction in which the cylinder axis 75 extends, it is possible to prevent stress from concentrating on the most protruding portion 86c of the inclined end surface 86b, and the vibration is applied to the most protruding portion 86c on the inclined end surface 86b. The stress can be efficiently dispersed by receiving at the inclined portion 86p connecting the retracted portion 86d. Therefore, stress concentration at the most projecting portion 86c of the cylindrical portion 86 can be prevented while increasing the bonding strength between the cylindrical portion 86 and the exhaust pipe main body 85 due to the shape of the inclined end face 86b.

また、図3に示したように、排気管本体85は、その上流端から下流側へ離れた位置に屈曲部85bを備え、この屈曲部85bの外周側(外周部85f)寄りに筒部86の最突出部86cが設けられているので、屈曲部85bの外周側寄りでは、屈曲部85bと最突出部86cとが干渉しにくくなるため、最突出部86cを長く確保することができ、この結果、排気管本体85と筒部86との溶接線を長くすることができ、排気管本体85と筒部86との接合強度をより高めることができるとともに接合部の応力分散効果を高めることができる。   Further, as shown in FIG. 3, the exhaust pipe main body 85 includes a bent portion 85b at a position away from the upstream end to the downstream side, and a cylindrical portion 86 near the outer peripheral side (outer peripheral portion 85f) of the bent portion 85b. Since the most protruding portion 86c is provided near the outer peripheral side of the bent portion 85b, the bent portion 85b and the most protruded portion 86c are less likely to interfere with each other. As a result, the weld line between the exhaust pipe main body 85 and the cylindrical portion 86 can be lengthened, the joint strength between the exhaust pipe main body 85 and the cylindrical portion 86 can be further increased, and the stress dispersion effect of the joint portion can be enhanced. it can.

また、図7(A)〜(C)、図8に示したように、排気管本体85は、筒部86内を貫通しつつ嵌合するとともに、筒部86は、フランジ部87内を貫通しつつ嵌合するので、排気管本体85の上流端の広範囲を筒部86とフランジ部87とで強固に補強することができる。
また、フランジ部87と筒部86の傾斜端面86bとの間に、筒部86の外周面86gと接合される環状の補強部材88が設けられるので、補強部材88を筒部86の外周面86gに接合して筒部86を補強することができる。
また、補強部材88は、周方向に複数に分割され、補強部材88と筒部86、及び補強部材88の分割部88a同士がそれぞれ溶接されるので、補強部材88を分割することで、分割部88aの筒部86への密着性を向上させることができ、補強効果を高めることができて、筒部86をより一層強固に補強することができる。
Further, as shown in FIGS. 7A to 7C and FIG. 8, the exhaust pipe body 85 is fitted while penetrating the inside of the cylindrical portion 86, and the cylindrical portion 86 penetrates the inside of the flange portion 87. Since the fitting is performed while the exhaust pipe main body 85 is fitted, a wide range of the upstream end of the exhaust pipe body 85 can be firmly reinforced by the cylindrical portion 86 and the flange portion 87.
Further, since the annular reinforcing member 88 joined to the outer peripheral surface 86g of the cylindrical portion 86 is provided between the flange portion 87 and the inclined end surface 86b of the cylindrical portion 86, the reinforcing member 88 is connected to the outer peripheral surface 86g of the cylindrical portion 86. It is possible to reinforce the cylindrical portion 86 by joining them.
Further, the reinforcing member 88 is divided into a plurality in the circumferential direction, and the reinforcing member 88, the tubular portion 86, and the divided portions 88a of the reinforcing member 88 are welded to each other. The adhesion of the 88a to the cylindrical portion 86 can be improved, the reinforcing effect can be enhanced, and the cylindrical portion 86 can be further reinforced.

また、図8(C)に示したように、フランジ部87は、補強部材88側の面としての下面87dが筒部86の外周面86gに溶接されるので、補強部材88と筒部86の外周面86gとの接合部に、フランジ部87の補強部材88側の下面87dと筒部86の外周面86gとの接合部を近接させることで、剛性の高い部分が接近することになり、フランジ部87と補強部材88との間の筒部86の剛性を高めることができる。
また、図7(B)に示したように、フランジ部87は、略ひし形に形成され、このひし形の対向する2つの頂部を通る直線としての中心線103上に筒部86の最突出部86c及び最後退部86dが位置するので、筒部86にフランジ部87を取付ける際に、最突出部86c及び最後退部86dの位置を基準にして筒部86に対してフランジ部87を容易に位置決めすることができ、組付性を向上させることができる。
Further, as shown in FIG. 8C, the flange portion 87 has a lower surface 87 d as a surface on the reinforcing member 88 side welded to the outer peripheral surface 86 g of the cylindrical portion 86. By bringing the lower surface 87d on the reinforcing member 88 side of the flange portion 87 and the outer peripheral surface 86g of the cylindrical portion 86 close to the joint portion with the outer peripheral surface 86g, a portion having high rigidity comes close to the flange portion 87g. The rigidity of the cylindrical portion 86 between the portion 87 and the reinforcing member 88 can be increased.
Further, as shown in FIG. 7B, the flange portion 87 is formed in a substantially rhombus shape, and the most projecting portion 86c of the cylindrical portion 86 on the center line 103 as a straight line passing through two opposing top portions of the rhombus. Since the most retracted portion 86d is located, when the flange portion 87 is attached to the tube portion 86, the flange portion 87 is easily positioned with respect to the tube portion 86 with reference to the positions of the most protruding portion 86c and the most retracted portion 86d. It is possible to improve the assembly.

また、図2に示したように、シリンダ軸線75は、車両前後方向に延び且つ略水平になるように前傾し、排気管46がエンジン27から車体後方へ延び、筒部86の最突出部86cは排気管本体85の前側に位置するので、排気管46がエンジン27から車体後方へ延びているので、排気管本体85とこの排気管本体85の前側に位置する最突出部86cとが干渉しにくくなるため、最突出部86cを長く確保することができ、排気管本体85と筒部86との接合強度を高めることができるとともに接合部の応力分散効果を高めることができる。
また、図5に示したように、排気管46は、車幅方向一側(車体右側)に配置されるマフラ47に接続され、筒部86の最突出部86cは、筒部86の最後退部86dよりも車幅方向一側(車体右側)に配置されているので、マフラ47側から排気管46に作用する振動や外力に対して、その振動や外力の方向とずれた位置に最突出部86cが配置されるため、最突出部86cへの応力集中を防ぐことができる。
Further, as shown in FIG. 2, the cylinder axis 75 extends in the vehicle front-rear direction and tilts forward so as to be substantially horizontal, and the exhaust pipe 46 extends from the engine 27 to the rear of the vehicle body. Since 86c is located on the front side of the exhaust pipe body 85, the exhaust pipe 46 extends from the engine 27 toward the rear of the vehicle body, so that the exhaust pipe body 85 and the most protruding portion 86c located on the front side of the exhaust pipe body 85 interfere with each other. Therefore, it is possible to secure the longest protruding portion 86c, increase the bonding strength between the exhaust pipe main body 85 and the cylindrical portion 86, and increase the stress dispersion effect of the bonding portion.
Further, as shown in FIG. 5, the exhaust pipe 46 is connected to the muffler 47 disposed on one side in the vehicle width direction (the right side of the vehicle body), and the most projecting portion 86 c of the cylindrical portion 86 is the last retracted portion of the cylindrical portion 86. Since it is arranged on one side in the vehicle width direction (right side of the vehicle body) with respect to the portion 86d, the vibration or external force acting on the exhaust pipe 46 from the muffler 47 side protrudes to the position shifted from the direction of the vibration or external force Since the portion 86c is arranged, stress concentration on the most protruding portion 86c can be prevented.

上述した実施形態は、あくまでも本発明の一態様を示すものであり、本発明の主旨を逸脱しない範囲で任意に変形及び応用が可能である。
例えば、上記実施形態において、図7(A)に示したように、補強部材88を周方向に2分割したが、これに限らず、3分割、4分割など複数に分割しても良い。
また、図7(B)に示したように、フランジ部87において、中心線103上に筒部86の最突出部86c及び最後退部86dを配置したが、これに限らず、中心線102上に最突出部86c及び最後退部86dを配置しても良い。
The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.
For example, in the above embodiment, as shown in FIG. 7A, the reinforcing member 88 is divided into two in the circumferential direction. However, the reinforcing member 88 is not limited to this and may be divided into a plurality of parts such as three or four.
Further, as shown in FIG. 7B, in the flange portion 87, the most projecting portion 86c and the most retracted portion 86d of the cylindrical portion 86 are arranged on the center line 103. The most projecting portion 86c and the most retracted portion 86d may be disposed on the left side.

本実施形態の排気管取付部81は、振動に対して特に配慮すべき単気筒エンジンや車体フレームに上下揺動自在に支持されるユニットスイング式のパワーユニットに適用可能である。
また、上記実施形態では、スクータ型の自動二輪車10に本発明を適用する場合を説明したが、これに限らず、他の形式の自動二輪車や、自動二輪車以外も含む鞍乗り型車両にも適用可能である。なお、鞍乗り型車両とは、車体に跨って乗車する車両全般を含み、自動二輪車(原動機付き自転車も含む)のみならず、ATV(不整地走行車両)に分類される三輪車両や四輪車両を含む車両である。
The exhaust pipe mounting portion 81 of this embodiment can be applied to a single-cylinder engine and a unit swing type power unit that is supported by a vehicle body frame so as to be swingable up and down.
In the above embodiment, the case where the present invention is applied to the scooter type motorcycle 10 has been described. However, the present invention is not limited to this, and the present invention is also applicable to other types of motorcycles and saddle-type vehicles including other than motorcycles. Is possible. The saddle-ride type vehicle includes all vehicles that ride on the vehicle body, and includes not only motorcycles (including bicycles with motors) but also three-wheeled vehicles and four-wheeled vehicles classified as ATVs (rough terrain vehicles). It is a vehicle including.

27 エンジン(内燃機関)
46 排気管
75 シリンダ軸線
77 排気口(内燃機関の取付部)
85 排気管本体
85b 屈曲部
85d 外周面
86 筒部
86b 傾斜端面
86c 最突出部
86d 最後退部
86E 軸線
86g 外周面
87 フランジ部
87c 上面(接合面)
87d 下面(補強部材側の面)
88a 分割部
97 仮想線
103 中心線(直線)
27 Engine (Internal combustion engine)
46 Exhaust pipe 75 Cylinder axis 77 Exhaust port (mounting part of internal combustion engine)
85 Exhaust pipe main body 85b Bent portion 85d Outer peripheral surface 86 Tube portion 86b Inclined end surface 86c Most protruding portion 86d Last retracted portion 86E Axis 86g Outer peripheral surface 87 Flange portion 87c Upper surface (joint surface)
87d bottom surface (surface on the reinforcing member side)
88a Dividing part 97 Virtual line 103 Center line (straight line)

Claims (9)

内燃機関(27)に接続される排気管(46)が、管状の排気管本体(85)と、この排気管本体(85)の上流端に取付けられる筒部(86)と、この筒部(86)に設けられて前記内燃機関(27)側の取付部(77)に接続されるフランジ部(87)とを備え、前記筒部(86)は該筒部(86)の軸線(86E)に対して傾斜した傾斜端面(86b)を有し、この傾斜端面(86b)が前記排気管本体(85)の外周面(85d)に接合される内燃機関の排気管構造において、前記傾斜端面(86b)で最も突出する最突出部(86c)と最も後退する最後退部(86d)とを、前記フランジ部(87)における前記内燃機関(27)側の取付部(77)への接合面(87c)に直交する方向から見たときに、前記最突出部(86c)と前記最後退部(86d)とを通る仮想線(97)が、前記内燃機関(27)のシリンダ軸線(75)に対して傾斜していることを特徴とする内燃機関の排気管構造。   An exhaust pipe (46) connected to the internal combustion engine (27) includes a tubular exhaust pipe main body (85), a cylindrical part (86) attached to an upstream end of the exhaust pipe main body (85), and the cylindrical part ( 86) and a flange portion (87) connected to the mounting portion (77) on the internal combustion engine (27) side, and the cylinder portion (86) is an axis (86E) of the cylinder portion (86). In the exhaust pipe structure of an internal combustion engine in which the inclined end surface (86b) is joined to the outer peripheral surface (85d) of the exhaust pipe body (85). 86b), the most projecting portion (86c) that protrudes most and the most retracted portion (86d) that retreats most are connected to the mounting portion (77) on the internal combustion engine (27) side in the flange portion (87). 87c) when viewed from the direction orthogonal to the most protruding portion (86c). Exhaust pipe structure of the virtual line (97) is an internal combustion engine, characterized in that is inclined with respect to the cylinder axis (75) of the internal combustion engine (27) to the passing through the rearmost portion (86d) and. 前記排気管本体(85)は、その上流端から下流側へ離れた位置に屈曲部(85b)を備え、この屈曲部(85b)の外周側寄りに前記筒部(86)の最突出部(86c)が設けられていることを特徴とする請求項1に記載の内燃機関の排気管構造。   The exhaust pipe main body (85) includes a bent portion (85b) at a position away from the upstream end to the downstream side, and the most protruding portion of the cylindrical portion (86) ( 86. The exhaust pipe structure for an internal combustion engine according to claim 1, wherein 86c) is provided. 前記排気管本体(85)は、前記筒部(86)内を貫通しつつ嵌合するとともに、前記筒部(86)は、前記フランジ部(87)内を貫通しつつ嵌合することを特徴とする請求項1又は2に記載の内燃機関の排気管構造。   The exhaust pipe body (85) is fitted while passing through the inside of the cylindrical portion (86), and the cylindrical portion (86) is fitted while passing through the flange portion (87). An exhaust pipe structure for an internal combustion engine according to claim 1 or 2. 前記フランジ部(87)と前記筒部(86)の傾斜端面(86b)との間に、前記筒部(86)の外周面(86g)と接合される環状の補強部材(88)が設けられていることを特徴とする請求項1乃至3のいずれか一項に記載の内燃機関の排気管構造。   Between the flange portion (87) and the inclined end surface (86b) of the cylindrical portion (86), an annular reinforcing member (88) joined to the outer peripheral surface (86g) of the cylindrical portion (86) is provided. The exhaust pipe structure for an internal combustion engine according to any one of claims 1 to 3, wherein the exhaust pipe structure is provided. 前記補強部材(88)は、周方向に複数に分割され、前記補強部材(88)と前記筒部(86)、及び前記補強部材(88)の分割部(88a)同士がそれぞれ溶接されていることを特徴とする請求項4に記載の内燃機関の排気管構造。   The reinforcing member (88) is divided into a plurality in the circumferential direction, and the reinforcing member (88), the tubular portion (86), and the divided portions (88a) of the reinforcing member (88) are welded to each other. The exhaust pipe structure for an internal combustion engine according to claim 4. 前記フランジ部(87)は、前記補強部材(88)側の面(87d)が前記筒部(86)の外周面(86g)に溶接されていることを特徴とする請求項4又は請求項5に記載の内燃機関の排気管構造。   The said flange part (87) has the surface (87d) by the side of the said reinforcement member (88) welded to the outer peripheral surface (86g) of the said cylinder part (86), The Claim 4 or Claim 5 characterized by the above-mentioned. 2. An exhaust pipe structure for an internal combustion engine according to 1. 前記フランジ部(87)は、略ひし形に形成され、このひし形の対向する2つの頂部を通る直線(103)上に前記筒部(86)の最突出部(86c)及び最後退部(86d)が位置することを特徴とする請求項1乃至6のいずれか一項記載の内燃機関の排気管構造。   The flange portion (87) is formed in a substantially rhombus shape, and the most projecting portion (86c) and the last retracted portion (86d) of the cylindrical portion (86) on a straight line (103) passing through two opposing top portions of the rhombus shape. The exhaust pipe structure for an internal combustion engine according to any one of claims 1 to 6, wherein 前記シリンダ軸線(75)は、車両前後方向に延び且つ略水平になるように前傾し、前記排気管(46)が前記内燃機関(27)から車体後方へ延び、前記筒部(86)の最突出部(86c)は前記排気管本体(85)の前側に位置することを特徴とする請求項1乃至7のいずれか一項に記載の内燃機関の排気管構造。   The cylinder axis (75) extends in the vehicle longitudinal direction and tilts forward so as to be substantially horizontal, the exhaust pipe (46) extends from the internal combustion engine (27) to the rear of the vehicle body, and the cylinder portion (86) The exhaust pipe structure for an internal combustion engine according to any one of claims 1 to 7, wherein the most projecting portion (86c) is located in front of the exhaust pipe main body (85). 前記排気管(46)は、車幅方向一側に配置されるマフラ(47)に接続され、前記筒部(86)の最突出部(86c)は、前記筒部(86)の最後退部(86d)よりも前記車幅方向一側に配置されていることを特徴とする請求項1乃至8のいずれか一項に記載の内燃機関の排気管構造。   The exhaust pipe (46) is connected to a muffler (47) disposed on one side in the vehicle width direction, and the most projecting part (86c) of the cylinder part (86) is the last retracted part of the cylinder part (86). The exhaust pipe structure for an internal combustion engine according to any one of claims 1 to 8, wherein the exhaust pipe structure is disposed on one side in the vehicle width direction with respect to (86d).
JP2011275286A 2011-12-16 2011-12-16 Exhaust pipe structure of internal combustion engine Active JP5543423B2 (en)

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JPS53213U (en) * 1976-06-21 1978-01-05
JPS57203814A (en) * 1981-06-09 1982-12-14 Yamaha Motor Co Ltd Exhaust device for two cycle engine
JPH027222Y2 (en) * 1987-07-13 1990-02-21
JPH05133224A (en) * 1991-04-19 1993-05-28 Yamaha Motor Co Ltd Exhaust pipe of engine
JPH094784A (en) * 1995-06-20 1997-01-07 Toho Rayon Co Ltd Coupling structure of hollow pipe and coupling method

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