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US 4,999,999 AGranted
Exhaust gas control device for motorcycles
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsNaohisa Takahashi, Yoshitsugu Hiraguchi
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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsNaohisa Takahashi, Yoshitsugu Hiraguchi
Estimating the term…
A number of embodiments of exhaust control devices particularly adapted for use with motorcycles and wherein the exhaust control device is designed to be positioned beneath the engine transmission assembly of the motorcycle and which offer a compact configuration. In each embodiment, the expansion device is formed of a fabricated member from sheet metal stampings. The exhaust device comprises an inlet or collector section an expansion chamber and an outlet. In some embodiments, both the inlet collector section conduits are formed from joined stampings and the expansion chamber is formed from joined stampings and in other embodiments only the expansion chamber is formed from joined stampings and the inlet conduits of the collector section are formed from formed tubular members. In all embodiments, an exhaust control valve is positioned in the expansion chamber for controlling the pulses existent in the inlet conduits of the collector section and the exhaust pipes so as to improve performance through out the entire engine load and speed ranges.
An exhaust control device for an internal combustion engine comprised of a plurality of exhaust pipes extending from exhaust ports of the engine, said device being comprised of an expansion chamber, a collector section comprised of a plurality of inlet conduits each adapted to communicate with an inlet end of a respective one of said exhaust pipes and having outlet ends disposed in side by side relationship with said expansion chamber, and an exhaust control means supported within said expansion chamber and cooperating with said conduit outlet ends for controlling the effective area thereof to control the transmission of exhaust pulses within said inlet conduits, the improvement comprising said exhaust device being fabricated of formed sheet members.
An exhaust control device for an internal combustion engine comprises a plurality of exhaust pipes extending from exhaust ports of the engine, said device being comprised of an expansion chamber, a collector section comprised of a plurality of inlet conduits each adapted to communicate with an inlet end of a respective one of said exhaust pipes and having outlet ends disposed in side by side relationship with said expansion chamber, and an exhaust control means supported within said expansion chamber and cooperating with said conduit outlet ends for controlling the effective area thereof to control the transmission of exhaust pulses within said inlet conduits, the improvement comprising said expansion chamber being formed with a generally rectangular inlet opening, said inlet conduit outlet ends being rectangular and received in abutting side by side relation in said expansion chamber inlet opening and affixed thereto.
Dependencies are inferred from the claim text.