Patent ID: 7811141
Filing Date: 2010-10-12
Classification: B63H

Abstract:
1. A boat propulsion unit comprising: an engine; a propeller driven by the engine; a variable speed mechanism portion arranged to transmit a driving force generated by the engine to the propeller such that a speed of the driving force is changed by at least a low reduction ratio and a high reduction ratio; a first housing arranged to house the variable speed mechanism portion; an oil tank provided on an outside of the first housing and arranged to retain oil to be supplied to the first housing; and an oil lubrication route arranged to supply oil in the oil tank to the first housing and to collect the oil supplied to the first housing in the oil tank; wherein the engine includes a drive shaft arranged to transmit a driving force, and the oil tank is disposed on at least one of two areas separated by a plane that includes an axis of the drive shaft and extends in a moving direction of a boat.