Ship propulsion machine

Abstract

A ship propulsion machine includes a first and second power sources for rotating a propeller, an intake port, a first cooling water supply passage connecting the intake port to the first power source, a pump that sends water flowed into the first cooling water supply passage from outside of the ship propulsion machine via the intake port toward the first power source as cooling water, a drain port, a first cooling water discharge passage connecting the first power source to the drain port a heat exchanger, a cooling medium circulation passage that circulates a cooling medium between the second power source and the heat exchanger, a second cooling water supply passage branched from the first cooling water supply passage and connecting the first cooling water supply passage to the heat exchanger, and a second cooling water discharge passage connecting the heat exchanger to the drain port.

What is claimed is: 
     
         1 . A ship propulsion machine for propelling a boat, the ship propulsion machine comprising:
 a first power source for rotating a propeller;   a second power source for rotating the propeller;   an intake port;   a first cooling water supply passage connecting the intake port to the first power source;   a pump configured to send water flowed into the first cooling water supply passage from outside of the ship propulsion machine via the intake port toward the first power source as cooling water;   a drain port;   a first cooling water discharge passage connecting the first power source to the drain port;   a heat exchanger;   a cooling medium circulation passage configured to circulate a cooling medium between the second power source and the heat exchanger;   a second cooling water supply passage branched from the first cooling water supply passage and connecting the first cooling water supply passage to the heat exchanger; and   a second cooling water discharge passage connecting the heat exchanger to the drain port.   
     
     
         2 . The ship propulsion machine according to  claim 1 , further comprising:
 a valve configured to control inflow of the cooling water from the first cooling water supply passage to the second cooling water supply passage.   
     
     
         3 . The ship propulsion machine according to  claim 1 , further comprising:
 a flow rate control valve configured to control a flow rate of the cooling water in the first cooling water supply passage based on a temperature of the cooling water after cooling the first power source; and   a pressure valve configured to control an amount of the cooling water flowing from the first cooling water supply passage into the second cooling water supply passage based on a pressure of the cooling water in the first cooling water supply passage, wherein   the flow rate control valve controls the flow rate of the cooling water in the first cooling water supply passage so that the flow rate of the cooling water in the first cooling water supply passage increases as the temperature of the cooling water after cooling the first power source rises, and   the pressure valve controls the amount of the cooling water flowing from the first cooling water supply passage to the second cooling water supply passage so that the amount of the cooling water flowing from the first cooling water supply passage to the second cooling water supply passage decreases as the pressure of the cooling water in the first cooling water supply passage increases.   
     
     
         4 . The ship propulsion machine according to  claim 1 , further comprising:
 a motor as the second power source; and   an inverter configured to control driving of the motor, wherein   the cooling medium circulation passage is a passage that circulates the cooling medium between the motor and the inverter and the heat exchanger.   
     
     
         5 . The ship propulsion machine according to  claim 1 , further comprising:
 a degassing tank configured to separate gas contained in the cooling medium that circulates in the cooling medium circulation passage.   
     
     
         6 . A ship propulsion machine for propelling a boat, the ship propulsion machine comprising:
 a first power source for rotating a propeller;   a second power source for rotating the propeller;   an intake port;   a first cooling water supply passage connecting the intake port to the first power source;   a pump configured to send water flowed into the first cooling water supply passage from outside of the ship propulsion machine via the intake port toward the first power source as cooling water;   a drain port;   a first cooling water discharge passage connecting the first power source to the drain port;   a second cooling water supply passage branched from the first cooling water supply passage and connecting the first cooling water supply passage to the second power source; and   a second cooling water discharge passage connecting the second power source to the drain port.   
     
     
         7 . The ship propulsion machine according to  claim 6 , further comprising:
 a valve configured to control inflow of the cooling water from the first cooling water supply passage to the second cooling water supply passage.   
     
     
         8 . The ship propulsion machine according to  claim 6 , further comprising:
 a flow rate control valve configured to control a flow rate of the cooling water in the first cooling water supply passage based on a temperature of the cooling water after cooling the first power source; and   a pressure valve configured to control an amount of the cooling water flowing from the first cooling water supply passage into the second cooling water supply passage based on a pressure of the cooling water in the first cooling water supply passage, wherein   the flow rate control valve controls the flow rate of the cooling water in the first cooling water supply passage so that the flow rate of the cooling water in the first cooling water supply passage increases as the temperature of the cooling water after cooling the first power source rises, and   the pressure valve controls the amount of the cooling water flowing from the first cooling water supply passage to the second cooling water supply passage so that the amount of the cooling water flowing from the first cooling water supply passage to the second cooling water supply passage decreases as the pressure of the cooling water in the first cooling water supply passage increases.   
     
     
         9 . The ship propulsion machine according to  claim 6 , further comprising:
 a motor as the second power source; and   an inverter configured to control driving of the motor, wherein   the second cooling water supply passage is a passage connecting the first cooling water supply passage to the motor and the inverter, and   the second cooling water discharge passage is a passage connecting the motor and the inverter to the drain port.