Marine vessel and exhaust manifold for marine vessel
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorSatoshi MATSUURA
Life of this patent
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Abstract
A marine vessel includes a hull, an engine, and an exhaust manifold including four upstream exhaust holes connected to four exhaust ports, respectively, one downstream central exhaust hole defined by two central upstream exhaust holes of the four upstream exhaust holes, two downstream side exhaust holes located downstream of the four upstream exhaust holes in an exhaust flow direction and spaced from and adjacent to the downstream central exhaust hole on both sides of the downstream central exhaust hole, and a water jacket. The water jacket is located in the exhaust manifold such that cooling water flows between the downstream central exhaust hole and the downstream side exhaust holes.
Claims20
A marine vessel comprising:
- a hull;
- a four-cylinder engine in or on the hull;
- and
- an exhaust manifold connected to the four-cylinder engine and including:
- four upstream exhaust holes connected to four exhaust ports of the four-cylinder engine, respectively;
- one downstream central exhaust hole located downstream of the four upstream exhaust holes in an exhaust flow direction and defined by two central upstream exhaust holes of the four upstream exhaust holes merged together;
- two downstream side exhaust holes located downstream of the four upstream exhaust holes in the exhaust flow direction and spaced apart from and adjacent to the downstream central exhaust hole on both sides of the downstream central exhaust hole;
- and
- a water jacket extending along the exhaust flow direction to allow cooling water to flow therethrough toward the four-cylinder engine in a direction opposite to the exhaust flow direction;
- wherein
- the water jacket is configured to allow the cooling water to flow between the downstream central exhaust hole and the downstream side exhaust holes.
An exhaust manifold for a marine vessel, the exhaust manifold comprising:
- four upstream exhaust holes connected to four exhaust ports of a four-cylinder engine in or on the marine vessel, respectively;
- one downstream central exhaust hole located downstream of the four upstream exhaust holes in an exhaust flow direction and defined two central upstream exhaust holes of the four upstream exhaust holes merged together;
- two downstream side exhaust holes located downstream of the four upstream exhaust holes in the exhaust flow direction and spaced apart from and adjacent to the downstream central exhaust hole on both sides of the downstream central exhaust hole;
- and
- a water jacket extending along the exhaust flow direction to allow cooling water to flow therethrough toward the four-cylinder engine in a direction opposite to the exhaust flow direction;
- wherein
- the water jacket is configured such that the cooling water flows between the downstream central exhaust hole and the downstream side exhaust holes.
Dependencies are inferred from the claim text.