Propulsion apparatus for underwater driving

Abstract

A propulsion apparatus for underwater driving comprising a driving unit housing having a motor embedded therein. A propulsion unit housing connected to the driving unit housing, having a plurality of inlet holes formed therein in a radius direction, and having a driving shaft for rotating a propeller using power received from the propeller and the motor.

1 . A propulsion apparatus for underwater driving, comprising:
 a driving unit housing having a motor embedded therein;   a propulsion unit housing connected to the driving unit housing, having a plurality of inlet holes formed therein in a radius direction, and comprising a propeller and a driving shaft for rotating the propeller;   a motor supplying power to the driving shaft and comprising:
 a stator having a coil wound on a core; and 
 a rotator having a permanent magnet, wherein one end of the driving shaft is integrally fixed to the rotator through a center of the rotator; 
   a separation diaphragm separating the rotator and the stator;   a diaphragm bracket supporting the separation diaphragm fixed thereto, and being fixed to the driving unit housing so that an air gap is provided between the separation diaphragm and the rotator; and   wherein the end of the driving shaft remains spaced apart from the separation diaphragm, and part of one side of the rotator is concaved so that a space S is formed between the separation diaphragm, the driving shaft, and the rotator.   
     
     
         2 . The propulsion apparatus of  claim 1 , wherein the air gap is 0.5 to 1.5 mm. 
     
     
         3 . The propulsion apparatus of  claim 1 , wherein an orifice is formed on the rotator and configured to discharge water introduced into the space S to a space outside the rotator on an opposite side to the separation diaphragm. 
     
     
         4 . The propulsion apparatus of  claim 1 , wherein a surface of the rotator is subject to waterproof coating. 
     
     
         5 . The propulsion apparatus of  claim 1 , wherein the driving shaft is rotated and supported by a pair of front and rear bearings and integrally fixed to the rotator through a center of the rotator, and the stator is separated from the driving shaft.