Marine propulsion device

Abstract

A marine propulsion device includes a motor including an output shaft, a drive shaft extending in a vertical direction of the marine propulsion device, and a cooling device. The motor is disposed so that an extension direction of the output shaft is a direction perpendicular to the vertical direction. The cooling device includes an intake port taking water outside the marine propulsion device into the marine propulsion device, a motor water jacket provided in the motor and cooling the motor, a water pump disposed below the motor and sending water taken into the marine propulsion device from the intake port to the motor water jacket as cooling water, and a first cooling water passage connecting a discharge port of the water pump to an inlet port of the motor water jacket.

What is claimed is: 
     
         1 . A marine propulsion device comprising:
 a motor including an output shaft;   a drive shaft extending in a vertical direction of the marine propulsion device;   a first transmission mechanism configured to transmit a rotation of the output shaft of the motor to the drive shaft,   a propeller shaft;   a second transmission mechanism configured to transmit a rotation of the drive shaft to the propeller shaft;   a propeller; and   a cooling device, wherein   the motor is disposed so that an extension direction of the output shaft is a direction perpendicular to the vertical direction,   the first transmission mechanism is disposed in front of the motor,   the second transmission mechanism is disposed below the first transmission mechanism,   the drive shaft extends between the first transmission mechanism and the second transmission mechanism,   the propeller shaft extends rearward from the second transmission mechanism,   the propeller is provided in a rear part of the propeller shaft, and   the cooling device includes
 an intake port configured to take water outside the marine propulsion device into the marine propulsion device, 
 a motor water jacket provided in the motor and configured to cool the motor, 
 a water pump disposed below the motor and configured to send water taken into the marine propulsion device from the intake port to the motor water jacket as cooling water, and 
 a first cooling water passage connecting a discharge port of the water pump to an inlet port of the motor water jacket. 
   
     
     
         2 . The marine propulsion device according to  claim 1 , wherein
 an impeller of the water pump is attached to the drive shaft, and   the inlet port of the motor water jacket is disposed at a lower part of a front part of the motor.   
     
     
         3 . The marine propulsion device according to  claim 1 , further comprising:
 a transmission mechanism housing covering the first transmission mechanism; and   a drive shaft housing disposed below the transmission mechanism housing and covering an upper part of the drive shaft, wherein   the motor is mounted on the drive shaft housing,   the cooling device includes
 a transmission mechanism cooling portion configured to cool the first transmission mechanism using cooling water, and 
 a second cooling water passage branched from the first cooling water passage and connecting the first cooling water passage to the transmission mechanism cooling portion, and 
   the water pump, the transmission mechanism cooling portion, the first cooling water passage, and the second cooling water passage are provided in the drive shaft housing.   
     
     
         4 . The marine propulsion device according to  claim 1 , further comprising:
 an inverter configured to control driving of the motor, wherein   the inverter is mounted on the motor, and   the cooling device includes
 an inverter water jacket provided in the inverter and configured to cool the inverter, and 
 a third cooling water passage connecting an outlet port of the motor water jacket to an inlet port of the inverter water jacket. 
   
     
     
         5 . The marine propulsion device according to  claim 4 , wherein
 the inverter is disposed above the motor,   the outlet port of the motor water jacket is disposed at an upper part of the motor, and   the inlet port of the inverter water jacket is disposed at a lower part of the inverter.   
     
     
         6 . The marine propulsion device according to  claim 5 , wherein the inverter water jacket is disposed at the lower part of the inverter. 
     
     
         7 . The marine propulsion device according to  claim 4 , wherein an outlet port of the inverter water jacket is disposed at a lower part of the inverter. 
     
     
         8 . The marine propulsion device according to  claim 4 , wherein
 the cooling device includes
 a drain port configured to discharge cooling water from inside of the marine propulsion device to outside of the marine propulsion device, and 
 a fourth cooling water passage connected to an outlet port of the inverter water jacket and configured to flow cooling water flowing out of the outlet port of the inverter water jacket toward the drain port, and 
   the fourth cooling water passage passes a position outside the motor and away from the motor.   
     
     
         9 . The marine propulsion device according to  claim 4 , wherein the cooling device includes a valve configured to change an amount of cooling water flowing out of the inverter water jacket according to a temperature of cooling water flowed in the inverter water jacket. 
     
     
         10 . The marine propulsion device according to  claim 1 , wherein the extension direction of the output shaft of the motor is a front-rear direction of the marine propulsion device.