Outboard motor
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKimitaka Saruwatari, Katsumi Ochiai, Toshio Suzuki
Life of this patent
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Abstract
An outboard motor includes a cooling water passage that guides cooling water to cool an exhaust passage and a cylinder unit. A cooling water intake port draws external cooling water into the cooling water passage. A water pump draws cooling water into the cooling water intake port and supplies the cooling water to the cooling water passage. A thermostat is arranged in the cooling water passage downstream of the catalytic converter and the cylinder unit. A first bypass passage is connected to a first connecting section provided on the cooling water passage. The first connecting section is provided along the cooling water passage at a position farther downstream than the catalytic converter and farther upstream than the thermostat.
Claims20
An outboard motor comprising:
- an engine including a cylinder unit;
- an exhaust passage arranged to guide exhaust gas discharged from the cylinder unit to underneath the engine;
- a catalytic converter provided in the exhaust passage;
- a cooling water passage arranged to guide cooling water to cool the exhaust passage and the cylinder unit;
- a cooling water intake port arranged to draw the cooling water into the cooling water passage;
- a water pump arranged to draw the cooling water from the cooling water intake port and supply the cooling water to the cooling water passage;
- a thermostat arranged farther downstream along the cooling water passage than the catalytic converter and the cylinder unit;
- and
- a first bypass passage connected to a first connecting section in the cooling water passage at a position farther downstream than the catalytic converter and farther upstream than the thermostat.
Dependencies are inferred from the claim text.