Marine vessel and exhaust manifold for marine vessel
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorSatoshi Matsuura
Life of this patent
Estimating the term…
Abstract
A marine vessel includes a hull, an engine, and an exhaust manifold including four upstream exhaust channels connected to four exhaust ports, respectively, one downstream central exhaust channel defined by two central upstream exhaust channels of the four upstream exhaust channels, two downstream side exhaust channels located downstream of the four upstream exhaust channels in an exhaust flow direction and spaced from and adjacent to the downstream central exhaust channel on both sides of the downstream central exhaust channel, and a water jacket. The water jacket is located in the exhaust manifold such that cooling water flows between the downstream central exhaust channel and the downstream side exhaust channels.
Claims20
A marine vessel comprising:
- a hull;
- a four-cylinder engine in or on the hull;
- and
- an exhaust manifold configured to convey exhaust gas from the four-cylinder engine in an exhaust flow direction, the exhaust manifold including:
- four upstream exhaust channels respectively connected to four exhaust ports of the four-cylinder engine, the four upstream exhaust channels including two upstream side exhaust channels, and two upstream central exhaust channels located between the two upstream side exhaust channels;
- a downstream central exhaust channel located downstream of a merging region of the two upstream central exhaust channels;
- two downstream side exhaust channels respectively located downstream of the two upstream side exhaust channels so as to be respectively spaced apart from and adjacent to the downstream central exhaust channel on opposite sides of the downstream central exhaust channel;
- and
- a water jacket extending along the exhaust channels so as to enable cooling water to flow toward the four-cylinder engine in a direction opposite to the exhaust flow direction;
- wherein
- the water jacket is configured to enable the cooling water to flow between the downstream central exhaust channel and the two downstream side exhaust channels.
An exhaust manifold for a conveying exhaust gas of a marine vessel in an exhaust flow direction, the exhaust manifold comprising:
- four upstream exhaust channels respectively connected to four exhaust ports of a four-cylinder engine in or on the marine vessel so as to convey the exhaust gas from the four-cylinder engine, the four upstream exhaust channels including two upstream side exhaust channels, and two upstream central exhaust channels located between the two upstream side exhaust channels;
- a downstream central exhaust channel located downstream of a merging region of the two upstream central exhaust channels;
- two downstream side exhaust channels respectively located downstream of the two upstream side exhaust channels so as to be respectively spaced apart from and adjacent to the downstream central exhaust channel on opposite sides of the downstream central exhaust channel;
- and
- a water jacket extending along the exhaust channels so as to enable cooling water to flow toward the four-cylinder engine in a direction opposite to the exhaust flow direction;
- wherein
- the water jacket is configured to enable the cooling water to flow between the downstream central exhaust channel and the two downstream side exhaust channels.
Dependencies are inferred from the claim text.