Outboard engine

Abstract

There are included: a motor contained in a top cover; a vertical shaft that is rotationally driven by the motor, the vertical shaft being contained in an extension casing; and a propeller that is rotationally driven by the vertical shaft, the propeller being provided at a gear casing, wherein a heat exchanging part is provided inside a front portion of the gear casing, and inside the heat exchanging part, there are formed an inflow-side oil channel and an outflow-side oil channel that cooling oil for cooling the motor flows through.

What is claimed is: 
     
         1 . An outboard engine comprising:
 a motor contained in a top cover; a vertical shaft that is rotationally driven by the motor, the vertical shaft being contained in an extension casing; and a propeller that is rotationally driven by the vertical shaft, the propeller being provided at a gear casing, wherein   a heat exchanging part is provided inside a front portion of the gear casing, and   inside the heat exchanging part, an oil channel is formed that cooling oil for cooling the motor flows through.   
     
     
         2 . The outboard engine according to  claim 1 , wherein
 a tubular oil channel member is provided in the heat exchanging part,   in the oil channel member, an inflow-side oil channel is formed that allows the cooling oil fed from the motor to flow through, and   between an inner surface of the heat exchanging part and an outer surface of the oil channel member, an outflow-side oil channel is formed that returns the cooling oil to the motor.   
     
     
         3 . The outboard engine according to  claim 2 , wherein a part of the oil channel member is in contact with an inner surface of the heat exchanging part. 
     
     
         4 . The outboard engine according to  claim 2 , wherein the heat exchanging part is formed into a shape that meets an outer shape of the oil channel member. 
     
     
         5 . The outboard engine according to  claim 1 , wherein there are formed inside the heat exchanging part a plurality of inflow-side oil channels that allow the cooling oil fed from the motor to flow through and a plurality of outflow-side oil channels that return the cooling oil to the motor.