Patent ID: 9694887
Date: 2017-07-04
CPC Classifications: B63H

Claim:
1. A ship propulsion device comprising: a rear propeller fixed to a drive shaft; a front propeller rotatably supported by the drive shaft in front of the rear propeller; a counter rotation unit configured to reverse rotating direction of the drive shaft and transmit reversed rotation to the front propeller; a motor configured to rotate the drive shaft; a housing configured to extend downward from a hull and surround the counter rotation unit and the motor; a second cylindrical lining attached to a front surface of a hub of the rear propeller for sealing between the hub of the rear propeller and the hub of the front propeller; and a second cylindrical sealing member installed to a rear surface of the front propeller so as to come into contact with an outer surface of the second lining; and a support ring interposed between the hub of the rear propeller and a rear thrust bearing provided at a rear of the hub of the front propeller.