A collecting exhaust pipe has a contour body and partition wall members. The contour body has a pair of contour members connected with each other. The partition wall members are joined to the contour body and sandwiched between the contour members. A plurality of swelling portions, which are swelled
A collecting exhaust pipe has a contour body and partition wall members. The contour body has a pair of contour members connected with each other. The partition wall members are joined to the contour body and sandwiched between the contour members. A plurality of swelling portions, which are swelled toward the other contour member side, are formed on at least one of the contour members so as to form tubular undulations that extend continuously along a plurality of the primary exhaust pipes, and are shaped so as to join on the downstream side of the contour body on at least one outer surface of the contour body. The partition wall members extend from the upstream portion to the downstream side of the contour body, and are joined to the contour body at the location spaced from the top portions of the swelling portions.
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1. In an exhaust device for a motorcycle comprising: a plurality of primary exhaust pipes, which are respectively connected to each cylinder of a multi-cylinder engine body mounted on a body frame, anda collecting exhaust pipe, which is commonly connected to the downstream end portion of the primary
1. In an exhaust device for a motorcycle comprising: a plurality of primary exhaust pipes, which are respectively connected to each cylinder of a multi-cylinder engine body mounted on a body frame, anda collecting exhaust pipe, which is commonly connected to the downstream end portion of the primary exhaust pipes,wherein said collecting exhaust pipe has a contour body, which consists of a pair of contour members connected with each other so as to form therebetween an exhaust gas flow passage for circulating the exhaust gas guided from a plurality of said primary exhaust pipes,partition wall members, which are joined to said contour body while being sandwiched between a pair of said contour members so as to divide the inside of said exhaust gas flow passage into at least two,a plurality of swelling portions are formed in each of said pair of contour members, said swelling portions are swelled toward said other contour member in order to form tubular undulations having a tubular shape apparently similar to the plurality of said primary exhaust pipes and extend continuously and respectively along each of the primary exhaust pipes on at least one of outer surfaces of said contour body and,said partition wall members are joined to said contour body at a location spaced from top portions of said swelling portions and extend from the upstream portion to a downstream side of said contour body along an exhaust gas flow direction of said exhaust gas flow passage. 2. The exhaust device for the motorcycle, according to claim 1, wherein said partition wall members are welded to both of the contour members and are welded to at least one of said contour members from inside of said contour body. 3. The exhaust device for the motorcycle, according to claim 2, wherein said partition wall members are welded to one said contour members from inside of said contour body and to the other of said contour members through welding holes, which are provided in the other contour member, from outside of said contour body. 4. The exhaust device for the motorcycle, according to claim 3, wherein an entire area of the portion of the other contour member in which said welding holes are provided is formed in a flat plate shape. 5. The exhaust device for the motorcycle, according to claim 1, wherein the upstream and downstream end portions along said exhaust gas flow direction of a pair of said partition wall members are joined while forming a hollow portion between the intermediate portions of the partition wall members, anda pair of said partition wall members, which divide said exhaust gas flow passage into two branch flow passages, are joined to said contour body so as to be sandwiched between the pair of contour members. 6. The exhaust device for the motorcycle, according to claim 5, wherein the downstream ends of said pair of said partition wall members are disposed in a middle of said contour body in said exhaust gas flow direction. 7. The exhaust device for the motorcycle, according to claim 5, wherein facing surfaces of the upstream end portion and the downstream end portion of said pair of said partition wall members are formed in a flat surface shape so as to abut on each other and to be joined. 8. The exhaust device for the motorcycle, according to claim 1, wherein a downstream end portion of said collecting exhaust pipe is connected to a single exhaust muffler,an inner tube, which collects exhaust gas of said exhaust gas flow passage and guides the exhaust gas into said exhaust muffler, is inserted in a downstream end portion of said contour body, andan upstream end portion of the inner tube is joined to said contour body. 9. The exhaust device for the motorcycle, according to claim 8, wherein a boss member, which penetrates the contour body and said inner tube, is joined to the downstream end portion of said contour body and,a sensor mounting hole, whose outer end is opened outside and whose inner end is communicated into said inner tube, is formed in the boss member so that an exhaust gas sensor attached on said boss member is inserted in the sensor mounting hole. 10. The exhaust device for the motorcycle, according to claim 2, wherein the upstream and downstream end portions along said exhaust gas flow direction of a pair of said partition wall members are joined while forming a hollow portion between the intermediate portions of the partition wall members, anda pair of said partition wall members, which divide said exhaust gas flow passage into two branch flow passages, are joined to said contour body so as to be sandwiched between the pair of contour members. 11. The exhaust device for the motorcycle, according to claim 10, wherein the downstream ends of said pair of said partition wall members are disposed in a middle of said contour body in said exhaust gas flow direction. 12. The exhaust device for the motorcycle, according to claim 10, wherein facing surfaces of the upstream end portion and the downstream end portion of said pair of said partition wall members are formed in a flat surface shape so as to abut on each other and to be joined. 13. The exhaust device for the motorcycle, according to claim 11, wherein facing surfaces of the upstream end portion and the downstream end portion of said pair of said partition wall members are formed in a flat surface shape so as to abut on each other and to be joined. 14. The exhaust device for the motorcycle, according to claim 3, wherein the upstream and downstream end portions along said exhaust gas flow direction of a pair of said partition wall members are joined while forming a hollow portion between the intermediate portions of the partition wall members, anda pair of said partition wall members, which divide said exhaust gas flow passage into two branch flow passages, are joined to said contour body so as to be sandwiched between the pair of contour members. 15. The exhaust device for the motorcycle, according to claim 14, wherein the downstream ends of said pair of said partition wall members are disposed in a middle of said contour body in said exhaust gas flow direction. 16. The exhaust device for the motorcycle, according to claim 14, wherein facing surfaces of the upstream end portion and the downstream end portion of said pair of said partition wall members are formed in a flat surface shape so as to abut on each other and to be joined. 17. The exhaust device for the motorcycle, according to claim 15, wherein facing surfaces of the upstream end portion and the downstream end portion of said pair of said partition wall members are formed in a flat surface shape so as to abut on each other and to be joined. 18. The exhaust device for the motorcycle, according to claim 4, wherein the upstream and downstream end portions along said exhaust gas flow direction of a pair of said partition wall members are joined while forming a hollow portion between the intermediate portions of the partition wall members, anda pair of said partition wall members, which divide said exhaust gas flow passage into two branch flow passages, are joined to said contour body so as to be sandwiched between the pair of contour members. 19. The exhaust device for the motorcycle, according to claim 18, wherein the downstream ends of said pair of said partition wall members are disposed in a middle of said contour body in said exhaust gas flow direction. 20. The exhaust device for the motorcycle, according to claim 18, wherein facing surfaces of the upstream end portion and the downstream end portion of said pair of said partition wall members are formed in a flat surface shape so as to abut on each other and to be joined.
Butler Boyd L., Thin boom tube exhaust pipes, method of sheet metal construction thereof, and exhaust systems which utilize such exhaust pipes for increased ground clearance on race cars.
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