Water-cooled outboard marine engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKouji Yasuda, Hideaki Takada, Yoshihiko Fukuda, Mitsuharu Tanaka
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Abstract
In a water-cooled outboard marine engine, a heat transfer portion is provided in an exit passage located between an outlet end of a cylinder water jacket and a cooling water outlet passage at a position upstream of the thermostat valve. Thus, when the thermostat valve has opened and the cooling water expelled from the water jacket via the thermostat valve has been replaced by freshly introduced cooling water, the heat transfer portion having a certain heat capacity warms the freshly introduced cooling water so that the rapid change in the cooling water temperature at the thermostat valve and the resulting hunting of the thermostat valve can be avoided.
Claims6
Cooling water passage arrangement for a water-cooled marine engine, comprising:
- a cylinder block including a water jacket;
- a water inlet passage having a first end submerged in a surrounding body of water and a second end communicating with said water jacket;
- a water pump provided in association with said water inlet passage;
- a water outlet passage having a first end communicating with said water jacket and a second end communicating with a water outlet port;
- a thermostat valve provided in an exit passage defined between an outlet end of said water jacket and an inlet end of said water outlet passage;
- and
- a heat transfer portion provided in said exit passage upstream of said thermostat valve.
Dependencies are inferred from the claim text.