Propulsion device for ship and ship having the same

Abstract

Disclosed are a propulsion device for a ship and a ship having same. The propulsion device, according to an embodiment of the present invention, comprises: a rear propeller fixed to a first driveshaft; a front propeller positioned in front of the rear propeller and supported rotably on the first driveshaft; a counter rotation device, which penetrates the hull, and which counter-rotates the front propeller and the rear propeller on the basis of the rotation of a second driveshaft, which is installed perpendicular to the first driveshaft; and a housing installed so as to envelope the second driveshaft and the counter rotation device.

1 . A ship propulsion device comprising:
 a rear propeller fixed to a first drive shaft;   a front propeller rotatably supported by the first drive shaft in front of the rear propeller;   a counter rotation unit configured to cause counter rotation of the front propeller and the rear propeller based on rotation of a second drive shaft which penetrates a hull and is installed perpendicular to the first drive shaft; and   a housing configured to surround the second drive shaft and the counter rotation unit.   
     
     
         2 . The device according to  claim 1 , wherein the counter rotation unit includes a driving bevel gear fixed to the second drive shaft, a first driven bevel gear fixed to a hub of the front propeller, and a second driven bevel gear fixed to the first drive shaft, and
 wherein the counter rotation unit transmits rotation of the driving bevel gear to the first driven bevel gear and the second driven bevel gear to cause counter rotation of the front propeller and the rear propeller.   
     
     
         3 . The device according to  claim 2 , wherein the counter rotation unit further includes an intermediate bevel gear tooth-engaged between the first driven bevel gear and the second driven bevel gear. 
     
     
         4 . The device according to  claim 3 , wherein the counter rotation unit further includes a shaft of an intermediate bevel gear, the shaft extending in a direction crossing the first drive shaft to support the intermediate bevel gear. 
     
     
         5 . The device according to  claim 4 , wherein a bearing is provided between the intermediate bevel gear and the intermediate bevel gear shaft supporting the intermediate bevel gear for smooth rotation of the intermediate bevel gear. 
     
     
         6 . The device according to  claim 1 , further comprising:
 a first cylindrical lining attached to a front surface of a hub of the front propeller for sealing between the hub of the front propeller and a rear surface of the housing surrounding the second drive shaft; and   a first cylindrical sealing member installed to the rear surface of the housing so as to come into contact with an outer surface of the first lining.   
     
     
         7 . The device according to  claim 1 , further comprising:
 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 a 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.   
     
     
         8 . A ship propulsion device rotatably installed to a hull, the device comprising:
 a first drive shaft;   a rear propeller fixed to the first drive shaft;   a front propeller rotatably supported by the first drive shaft in front of the rear propeller;   a second drive shaft extending from the hull, the second drive shaft being installed perpendicular to the first drive shaft; and   a counter rotation unit configured to transmit rotational force of the second drive shaft to the front propeller and the first drive shaft so as to enable reversed rotation of the front propeller and the first drive shaft.   
     
     
         9 . The device according to  claim 8 , further comprising a housing installed to surround the second drive shaft and the counter rotation unit, the housing being configured to rotatably support the first drive shaft. 
     
     
         10 . The device according to  claim 9 , further comprising:
 a first cylindrical lining attached to a front surface of a hub of the front propeller for sealing between the hub of the front propeller and a rear surface of the housing surrounding the second drive shaft;   a first cylindrical sealing member installed to the rear surface of the housing so as to come into contact with an outer surface of the first lining;   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.   
     
     
         11 . The device according to  claim 8 , wherein the counter rotation unit includes a driving bevel gear fixed to the second drive shaft, a first driven bevel gear fixed to the hub of the front propeller, and a second driven bevel gear fixed to the first drive shaft, and
 wherein the counter rotation unit transmits rotation of the driving bevel gear to the first driven bevel gear and the second driven bevel gear to cause counter rotation of the front propeller and the rear propeller.   
     
     
         12 . A ship including a ship propulsion device according to  claim 1 .