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US 2006/0068658 A1Published application
Engine exhaust system
AssigneeYamaha Marine Kabushiki Kaisha
InventorHaruo Okamoto
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AssigneeYamaha Marine Kabushiki Kaisha
InventorHaruo Okamoto
Estimating the term…
An engine exhaust system has an exhaust gas passage and a coolant passage. The coolant passage surrounds at least a portion of the exhaust passage. The system is also equipped with an exhaust conduit, which mixes exhaust gases and coolant and then releases the mixture outside of a watercraft. A perforated plate has an array of holes. A central portion of the perforated plate is curved and projects downstream within the exhaust conduit. This curved central portion enables the exhaust gas and the coolant to mix after passing through the perforated plate. A guide tube is positioned downstream of the perforated plate, so that the exhaust gases pass through the guide tube after passing through the holes of the perforated plate. The coolant passes through outer holes of the perforated plate and then passes around the circumference of the guide tube and is ultimately mixed with the exhaust gases.
An engine exhaust system comprising an exhaust conduit having an exhaust gas passage for exhaust gas discharged from an engine and a coolant passage for a coolant that has cooled the engine, the coolant passage surrounding a portion of the exhaust gas passage, the exhaust gas passage extending downstream of an outlet of the coolant passage, a perforated plate having an array of holes and being positioned within the exhaust gas passage at a location generally corresponding to the outlet of the coolant passage.
An exhaust system for a watercraft having an engine, the exhaust system comprising an exhaust conduit having an exhaust gas passage through which exhaust gases discharged from the engine pass and a cooling water passage through which cooling water that has cooled the engine passes, a junction is configured to merge the exhaust gases and the cooling water, and a perforated plate being positioned between the junction and the exhaust gas passage such that exhaust gases pass through the perforated plate before being mixed with the cooling water at the junction.
An exhaust system for a marine engine, the exhaust system comprising an exhaust conduit, the exhaust conduit having a first end and a second end, the first end of the exhaust conduit comprising multiple runners that are adapted to be connected to a cylinder head of the marine engine, the second end of the exhaust conduit comprising an outlet that is adapted to be secured to a water lock by a connection conduit, the exhaust conduit comprising an outer member and an inner member, an inner surface of the inner member defining an exhaust passage, a coolant passage being defined between an outer surface of the inner member and an inner surface of the outer member, and a perforated plate being positioned over at least a portion of the exhaust passage proximate the outlet of the exhaust conduit such that at least a portion of the exhaust gases passing through the exhaust conduit must flow through the perforated plate.
Dependencies are inferred from the claim text.