Patent ID: 6558209
Filing Date: 2003-05-06
Classification: B63H,Y02T

Abstract:
A boat drive system comprising:a transmission unit adapted to be mounted to a boat hull; a propeller shaft connected to the transmission unit to be driven thereby; a coupling member mounted for rotation with the propeller shaft and including a first rotation transmission structure disposed on an end of the coupling member facing away from the transmission unit; an auxiliary drive unit for driving the propeller shaft comprising: a housing mounted for movement relative to the transmission unit in a direction parallel to a longitudinal axis of the propeller shaft, an auxiliary motor mounted on the housing, a drive wheel rotatably mounted to the housing and operably connected to the auxiliary motor to be driven thereby, the drive wheel being hollow, with the propeller shaft extending therethrough, the drive wheel including a second rotation transmission structure facing the first rotation transmission structure, and an actuating mechanism for moving the auxiliary drive unit parallel to the axis selectively toward and away from the transmission unit, to bring the first and second rotation transmitting structures into and out of rotation transmitting connection.