Suzuki Kabushiki Kaisha

Satoshi Isobe

Takeshi Toyama

Keiji Imanaga

An outboard motor includes an engine holder, an engine which is disposed above the engine holder in a state of the outboard motor mounted to a hull and in which a crankshaft extends substantially perpendicularly, and an oil pan disposed below the engine holder. A drive shaft housing is disposed below the oil pan and is formed with an exhaust chamber and a water pump is driven by the drive shaft so as to pump up a cooling water. A cooling water passage is formed in the oil pan and the drive shaft housing to guide the cooling water pumped up by the water pump to the engine. A relief valve is disposed on the way of the cooling water passage so as to discharge the cooling water into the exhaust chamber.

Outboard motor

An outboard motor generally includes an engine holder, an engine disposed above the engine holder in a state of the outboard motor being mounted to a hull, an oil pan disposed below the engine holder, and a drive shaft housing disposed below the oil pan. Exhaust passages are formed in the engine holder and the oil pan and adapted to exhaust an exhaust gas from the engine into the drive shaft housing, one exhaust passage formed to the oil pan has a downstream side end opening, and an exhaust tube is provided for a bottom surface portion of the oil pan so as to align with the downstream side end opening of the one exhaust passage. The exhaust tube having a downstream side outlet positioned, in a plan view, at a substantially central portion of the drive shaft housing.

Growing community of inventors

Hamamatsu, Japan

Satoshi Isobe