Patent ID: 8087958

Claim:
A boat propulsion system comprising: a drive bevel gear fixed on a lower end of a drive shaft arranged to rotate in one direction; a forwarding bevel gear and a reversing bevel gear rotatably fitted on a propeller shaft and meshing together with the drive bevel gear; a dog clutch mounted on the propeller shaft and rotatable with the propeller shaft, arranged to move in an axial direction of the propeller shaft, and meshes together with the forwarding bevel gear or the reversing bevel gear to rotate the propeller shaft; and a forwarding side buffer member; wherein the propeller shaft is arranged to contact with the forwarding bevel gear via the forwarding side buffer member; the forwarding side buffer member includes at least an elastic member that is arranged to be elastically deformed between the propeller shaft and the forwarding bevel gear; and the forwarding side buffer member is in direct contact with the forwarding bevel gear.