Patent ID: 8690624
Filing Date: 2014-04-08
Classification: B63H,F01N

Abstract:
1. A vessel propulsion apparatus comprising: an engine including a crankshaft rotatable around a crank axis extending in a vertical direction; a first exhaust passage including an upward guiding portion that guides exhaust generated by the engine upward; a second exhaust passage that is disposed at a downstream side relative to the first exhaust passage and guides the exhaust generated by the engine; an exhaust outlet that discharges the exhaust guided by the second exhaust passage underwater; and a communication passage that communicates the first exhaust passage and the second exhaust passage with each other and includes a first upstream end opening at the first exhaust passage, a second downstream end disposed below the first upstream end and opening at the second exhaust passage, and an expanded portion disposed at a height in between the first upstream end and the second downstream end and being more expanded than the first upstream end and the second downstream end.