Motorcycle engine exhaust system
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKazuhiko Nomura, Satoru Ichikawa
Life of this patent
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Abstract
A motor cycle includes a frame, a front and rear wheel, and an engine mounted to the frame which has at least two exhaust pipes. A muffler is mounted to the frame beneath the engine, and both exhaust pipes discharge into the muffler. At least one tailpipe exhausts from the muffler. The silencing volume of the muffler can enable a shorter-than-usual tailpipe to be used, which need not interfere with access to the rear wheel axle.
Claims21
An engine exhaust system for a motorcycle of the type having a frame, a front and rear wheel mounted to said frame, a V type engine with at least two cylinders arranged to form a "V", and arranged forwardly and rearwardly relative to one another, said exhaust system comprising:
- a muffler mounted to said frame underneath said engine, said muffler having an expansion chamber, a forward exhaust pipe extending from the forwardmost cylinder forwardly and downwardly to discharge into said expansion chamber, a rearward exhaust pipe extending from the rearwardmost cylinder downwardly to discharge into said expansion chamber, and a tailpipe having a volume and a dimension of length, exhausting from said muffler, said forward exhaust pipe and tailpipe, where they respectively enter and leave said muffler, being substantially coaxial, said rearward exhaust pipe passing downwardly rearwardly of said engine and forwardly of said rear wall.
An engine exhaust system for a motorcycle of the type having a frame, a front and rear wheel mounted to said frame, said rear wheel being mounted to said frame by a pair of laterally spaced-apart rearwardly extending arms which are pivoted to said frame by a pivot, a V type engine with at least two cylinders arranged to form a "V", and arranged forwardly and rearwardly relative to one another, said exhaust system comprising:
- a muffler mounted to said frame underneath said engine, said muffler having an expansion chamber, a forward exhaust pipe extending from the forwardmost cylinder forwardly and downwardly to discharge into said expansion chamber, a rearward exhaust pipe extending from the rearwardmost cylinder downwardly between said rearwardly extending arms, rearwardly of said pivot and forwardly of said rear wheel, to discharge into said expansion chamber, and a tailpipe having a volume and dimension of length, exhausting from said muffler.
In combination with a motorcycle of the type having a frame portion, a front wheel dirigibly supported by said frame, a V-type engine supported by said frame with its crankshaft axis extending transversely to said frame, trailing arm means pivotally connected to said frame for pivotal movement about a transversely extending pivot axis, and a rear wheel journaled by said trailing arm means, an exhaust system comprising an exhaust device extending transversely across said frame for substantially the entire width of said frame and juxtaposed at a level below that of said engine and in proximity to said trailing arm pivot axis, a front bank exhaust pipe extending from the front bank of said engine downwardly and terminating in said exhaust device, a rear bank exhaust pipe extending downwardly into said exhaust device, said rear bank exhaust pipe being positioned ahead of the said rear wheel, and a tailpipe discharging rearwardly from said exhaust device.
Dependencies are inferred from the claim text.