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An exhaust pipe that forms an exhaust flow channel includes a first flow channel member that forms part of the exhaust flow channel, and a second flow channel member connected in series with the first flow channel member, and forms part of the exhaust flow channel. A downstream-side end of the first

An exhaust pipe that forms an exhaust flow channel includes a first flow channel member that forms part of the exhaust flow channel, and a second flow channel member connected in series with the first flow channel member, and forms part of the exhaust flow channel. A downstream-side end of the first flow channel member is inserted into an upstream-side end of the second flow channel member. A communication channel that communicates between an inside and an outside of the exhaust pipe is formed between an outer surface of an insertion part of the first flow channel member and an inner surface of an insertion-receiving part of the second flow channel member. The insertion-receiving part is arranged to face higher than a horizontal direction.

대표청구항 ▼

1. An exhaust pipe that forms an exhaust flow channel, the exhaust pipe comprising: a first flow channel member that forms part of the exhaust flow channel; anda second flow channel member that is connected in series with the first flow channel member and forms part of the exhaust flow channel,a dow

1. An exhaust pipe that forms an exhaust flow channel, the exhaust pipe comprising: a first flow channel member that forms part of the exhaust flow channel; anda second flow channel member that is connected in series with the first flow channel member and forms part of the exhaust flow channel,a downstream-side end of the first flow channel member being inserted into an upstream-side end of the second flow channel member,a communication channel that communicates between an inside and an outside of the exhaust pipe being formed between an outer surface of an insertion part of the first flow channel member and an inner surface of an insertion-receiving part of the second flow channel member,wherein the insertion-receiving part is arranged to face higher than a horizontal direction, andwherein the exhaust flow channel is a flow channel from an upstream side opening which is an opening formed on an upstream side of a connecting part between the first flow channel member and the second flow channel member to a downstream side opening which is an opening formed on a downstream side of the connecting part between the first flow channel member and the second flow channel member, and, when a flow channel length from the upstream-side opening to the downstream-side opening is L, a leading end of the insertion part of the first flow channel member is positioned away by a length of L/6 or more from each of the upstream-side opening and the downstream-side opening. 2. An exhaust pipe according to claim 1, further comprising a mesh member provided in the communication channel, wherein the inside and outside of the exhaust pipe are in communication with each other via the mesh member. 3. An exhaust pipe according to claim 1, further comprising a cover that covers an opening of the communication channel from the outside so as not to be exposed. 4. An exhaust pipe according to claim 3, wherein the first flow channel member and the cover are formed of a single component. 5. An exhaust pipe according to claim 1, wherein the communication channel communicates between the inside and outside of the exhaust pipe via a through hole formed in the second flow channel member. 6. An exhaust pipe according to claim 1, wherein the communication channel communicates between the inside and outside of the exhaust pipe via an opening formed between a leading end of the insertion-receiving part and the outer surface of the insertion part. 7. An exhaust pipe according to claim 1, wherein the first flow channel member and the second flow channel member are joined at the insertion part and the insertion-receiving part. 8. An exhaust pipe according to claim 7, wherein the insertion-receiving part includes a reduced diameter part having a reduced inner diameter that corresponds to the outer diameter of the insertion part, and the first flow channel member and the second flow channel member are joined at the reduced diameter part. 9. An exhaust pipe according to claim 1, wherein a portion that is the upstream-side end of the second flow channel member and that includes the insertion-receiving part has a larger inner diameter than the outer diameter of the insertion part. 10. An exhaust pipe according to claim 1, wherein the insertion part is arranged such that center axes of the insertion part and of the insertion-receiving part coincide with each other. 11. An exhaust pipe according to claim 1, wherein the exhaust pipe forms an exhaust flow channel from an inside of a muffler to an exhaust gas outlet in an exhaust system for a motor vehicle. 12. An exhaust pipe according to claim 1, comprising a constricted part having a shape in which a portion in an axial direction of the first channel member is recessed radially inward over an entire circumference of the portion on an upstream side of the insertion part of the first channel member. 13. An exhaust pipe according to claim 1, comprising an expansion part having a shape in which a portion in an axial direction of the first channel member projects radially outward over an entire circumference of the portion on an upstream side of the insertion part of the first flow channel member. 14. An exhaust pipe according to claim 4, wherein the downstream-side end of the first flow channel member includes an enlarged diameter part, a folded part obtained by folding back inward a leading end of the enlarged diameter part, and a thin pipe part obtained by folding back inward the folded part, the thin pipe part is inserted into the upstream side end of the second flow channel member, the thin pipe part being formed to have a smaller outer diameter than an inner diameter of the insertion part so that a regular gap is formed between an outer circumferential surface of the thin pipe part and an inner circumferential surface of the insertion-receiving part as the communication flow channel,the folded part is formed to have a larger inner diameter than an outer diameter of the insertion-receiving part, the folded part being arranged to overlap with a leading end of the insertion-receiving part in an axial direction, thereby to function as the cover. 15. An exhaust pipe that forms an exhaust flow channel, the exhaust pipe comprising: a first flow channel member that forms part of the exhaust flow channel; anda second flow channel member that is connected in series with the first flow channel member and forms part of the exhaust flow channel,a downstream-side end of the first flow channel member being inserted into an upstream-side end of the second flow channel member,a communication channel that communicates between an inside and an outside of the exhaust pipe being formed between an outer surface of an insertion part of the first flow channel member and an inner surface of an insertion-receiving part of the second flow channel member, wherein the insertion-receiving part is arranged to face higher than a horizontal direction, anda cover that covers an opening of the communication channel from the outside so as not to be exposed, wherein the first flow channel member and the cover are formed of a single component,wherein the downstream-side end of the first flow channel member includes an enlarged diameter part, a folded part obtained by folding back inward a leading end of the enlarged diameter part, and a thin pipe part obtained by folding back inward the folded part,wherein the thin pipe part is inserted into the upstream side end of the second flow channel member, the thin pipe part being formed to have a smaller outer diameter than an inner diameter of the insertion part so that a regular gap is formed between an outer circumferential surface of the thin pipe part and an inner circumferential surface of the insertion-receiving part as the communication flow channel, andwherein the folded part is formed to have a larger inner diameter than an outer diameter of the insertion-receiving part, the folded part being arranged to overlap with a leading end of the insertion-receiving part in an axial direction, thereby to function as the cover. 16. An exhaust pipe according to claim 15, further comprising a mesh member provided in the communication channel, wherein the inside and outside of the exhaust pipe are in communication with each other via the mesh member.