Patent ID: 9260171
Filing Date: 2016-02-16
CPC Classification: B63H,F01N,F02F,Y02T

Claim Text:
1. A vessel propulsion apparatus comprising: an engine including a plurality of combustion chambers in which a mixed gas of air and fuel is combusted; a catalyst that purifies an exhaust generated in the plurality of combustion chambers; an exhaust passage including a plurality of exhaust ports respectively connected to the plurality of combustion chambers, an exhaust collecting passage connected to each of the plurality of exhaust ports, and a catalyst housing passage connected to the exhaust collecting passage and that guides the exhaust, discharged from the plurality of combustion chambers into the exhaust collecting passage via the plurality of exhaust ports, to the catalyst housed in the catalyst housing passage; a water pump that takes water outside the vessel propulsion apparatus as cooling water into an interior of the vessel propulsion apparatus; and a cooling water passage including an upstream water passage that guides the cooling water taken into the interior of the vessel propulsion apparatus by the water pump and a first parallel water passage and a second parallel water passage that are connected in series to the upstream water passage and connected in parallel to each other, the cooling water passage supplying the cooling water from the upstream water passage to each of the first parallel water passage and the second parallel water passage to cool the catalyst housing passage by the first parallel water passage being disposed along the catalyst housing passage and to cool the exhaust collecting passage by the second parallel water passage being disposed along the exhaust collecting passage.