Patent ID: 9260172
Filing Date: 2016-02-16
CPC Classification: B63H,F01N,F01P,F02B,Y02T

Claim Text:
1. An outboard motor comprising: an engine; an exhaust passage that guides an exhaust generated in the engine; a catalyst disposed inside the exhaust passage and that purifies the exhaust flowing inside the exhaust passage; a cooling water passage including at least a portion disposed at a periphery of the catalyst and that guides cooling water that cools the exhaust passage; a water pump disposed lower than the catalyst and that supplies water outside the outboard motor as the cooling water to the cooling water passage via a water inlet that opens at an outer surface of the outboard motor; a vent hole disposed higher than the catalyst and that connects an interior of the cooling water passage to an exterior of the cooling water passage; and a restriction valve that allows a fluid to flow from the interior of the cooling water passage to the exterior of the cooling water passage via the vent hole and that restricts the flow of the fluid from the exterior of the cooling water passage to the interior of the cooling water passage via the vent hole; wherein the restriction valve restricts the flow of fluid from the exterior of the cooling water passage to the interior of the cooling water passage at a flow rate smaller than the restriction valve allows the flow of fluid from the interior of the cooling water passage to the exterior of the cooling water passage.