Outboard motor and boat
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKimitaka Saruwatari, Yu Wakamizu
Life of this patent
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Abstract
An outboard motor includes an engine, a propeller shaft, a propeller attached to the propeller shaft, a transmission to transmit rotation of the engine to the propeller shaft, an upper accommodation body accommodating at least a portion of the engine, a lower accommodation body accommodating at least a portion of the propeller shaft, and a steering to cause the lower accommodation body to rotate about a steering axis with respect to the upper accommodation body. The upper accommodation body includes an upper coolant channel. The lower accommodation body includes a lower coolant channel including a coolant intake port. A communication area between the upper and lower coolant channels is changeable according to a rudder angle of the steering.
Claims14
An outboard motor comprising:
- an engine;
- a propeller shaft;
- a propeller attached to the propeller shaft;
- a transmission to transmit rotation of the engine to the propeller shaft;
- an upper accommodation body that accommodates at least a portion of the engine;
- a lower accommodation body that accommodates at least a portion of the propeller shaft;
- and
- a steering to cause the lower accommodation body to rotate about a steering axis with respect to the upper accommodation body;
- wherein
- the upper accommodation body includes an upper coolant channel;
- the lower accommodation body includes a lower coolant channel including a coolant intake port;
- the upper coolant channel communicates with the lower coolant channel along a direction perpendicular to the steering axis;
- and
- a communication area between the upper coolant channel and the lower coolant channel is changeable according to a rudder angle of the steering.
An outboard motor comprising:
- an engine;
- a propeller shaft;
- a propeller attached to the propeller shaft;
- a transmission to transmit rotation of the engine to the propeller shaft;
- an upper accommodation body that accommodates at least a portion of the engine;
- a lower accommodation body that accommodates at least a portion of the propeller shaft;
- and
- a steering to cause the lower accommodation body to rotate about a steering axis with respect to the upper accommodation body;
- wherein
- the upper accommodation body includes an upper coolant channel;
- the lower accommodation body includes a lower coolant channel including a coolant intake port;
- the upper coolant channel communicates with the lower coolant channel along a direction perpendicular to the steering axis;
- and
- a communication area between the upper coolant channel and the lower coolant channel is changeable according to a rudder angle of the steering or a speed of the engine.
Dependencies are inferred from the claim text.