Exhaust device for motorcycle

摘要

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.

主权项

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, and a 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.