Electrically driven, retractable rudder propeller including a step-down gear unit

Abstract

A driving device for a ship is described, including a rudder propeller with a propeller shaft and with a vertical shaft which drives the propeller shaft via an angular gear unit and which is rotatable and driven by an electric driving motor, and including a lifting device for moving the rudder propeller between a retracted position within the ship and a deployed operating position outside the ship.

1 . A driving device for a ship, comprising:
 a rudder propeller comprising a propeller shaft and a vertical shaft which drives the propeller shaft via an angular gear unit and which is rotatable and driven by an electric driving motor; a lifting device for moving the rudder propeller between a retracted position within the ship and a deployed operating position outside the ship; and a step-down gear unit is provided between the electric driving motor and the vertical shaft.   
     
     
         2 . The driving device of  claim 1 , wherein the step-down gear unit is configured as a spur gear with a vertical spur gear axis. 
     
     
         3 . The driving device of  claim 1 , wherein the electric driving motor drives a drive shaft which is fitted axially parallel to the vertical shaft. 
     
     
         4 . The driving device of  claim 3 , wherein the electric driving motor is fitted below the step-down gear unit. 
     
     
         5 . The driving device of  claim 1 , wherein the electric driving motor and the step-down gear unit can be moved by the lifting device together with the rudder propeller. 
     
     
         6 . The driving device of  claim 1 , wherein the electric driving motor and the step-down gear unit are positioned inside the ship. 
     
     
         7 . The driving device of  claim 1 , wherein the electric driving motor is positioned fixed inside the ship, while the step-down gear unit moves, using the lifting device, together with the rudder propeller and a clutch is provided between the electric driving motor and the step-down gear unit with which the electric driving motor next to the rudder propeller moved into operational position can be coupled up with the step-down gear unit. 
     
     
         8 . The driving device of  claim 1 , wherein the vertical shaft next to the electric driving motor can be driven with an additional driving motor. 
     
     
         9 . The driving device of  claim 1 , wherein the electric driving motor can be operated as a generator.