Cooling system for an outboard motor having both open and closed loop portions
View Patent ↗A cooling system for an outboard motor pumps water from a body of water through certain selected portions of the outboard motor and through a heat exchanger which, in turn, comprises a coolant conduit that is directed to conduct the coolant in thermal communication with various portions of the outboard motor. The engine block is cooled by a flow of the coolant and an engine head is cooled by a flow of water from the body of water. Other heat emitting devices are connected in thermal and fluid communication with the water and coolant conduits.
1. A cooling system of an outboard motor, comprising:
a water pump;
a first water conduit;
a second water conduit, said water pump being configured to draw water from a body of water in which said outboard motor is operating and induce that water to flow through said first and second water conduits;
an engine block having a plurality of cylinders formed therein;
an engine block cooling passage disposed in thermal communication with said plurality of cylinders, said engine block cooling passage having an engine block inlet and an engine block outlet;
an engine head attached to said engine block;
an engine head cooling passage disposed in thermal communication with a plurality of combustion chambers disposed within said engine head, said engine head cooling passage having an engine head inlet and an engine head outlet, said first water conduit being connected in fluid communication with said engine head cooling passage;
a heat exchanger;
a first coolant conduit, said first coolant conduit being disposed in thermal communication with said second water conduit within said heat exchanger and with said engine block cooling passage; and
a circulation pump disposed in fluid communication with said first coolant conduit.
2. The cooling system of claim 1 , wherein:
said first and second water conduits are connected in parallel with each other.
3. The cooling system of claim 1 , further comprising:
a thermostat disposed in thermal and fluid communication with said first coolant conduit.
4. The cooling system of claim 3 , further comprising:
a second coolant conduit connected in fluid communication between said thermostat and said engine block inlet, said thermostat being disposed in fluid communication between said engine block outlet and said second coolant conduit.
5. The cooling system of claim 1 , further comprising:
an oil cooler disposed in fluid and thermal communication with said first coolant conduit.
6. The cooling system of claim 1 , further comprising:
a third water conduit connected in fluid communication with said water pump and in parallel fluid communication with said first and second water conduits.
7. The cooling system of claim 6 , further comprising:
a fuel system module connected in thermal and fluid communication with said third water conduit.
8. The cooling system of claim 1 , further comprising:
a charge air cooler disposed in thermal and fluid communication with said first water conduit.
9. The cooling system of claim 1 , further comprising:
an exhaust conduit connected in exhaust gas conducting communication with said engine.
10. The cooling system of claim 9 , further comprising:
an exhaust conduit cooling passage disposed in thermal communication with said exhaust conduit and in fluid communication with said first water conduit.
11. A cooling system of an outboard motor, comprising:
a water pump;
a first water conduit;
a second water conduit, said water pump being configured to draw water from a body of water in which said outboard motor is operating and induce that water to flow through said first and second water conduits;
an engine block having a plurality of cylinders formed therein;
an engine block cooling passage disposed in thermal communication with said plurality of cylinders, said engine block cooling passage having an engine block inlet and an engine block outlet;
an engine head attached to said engine block;
an engine head cooling passage disposed in thermal communication with a plurality of combustion chambers disposed within said engine head, said engine head cooling passage having an engine head inlet and an engine head outlet, said first water conduit being connected in fluid communication with said engine head cooling passage;
a heat exchanger;
a first coolant conduit, said first coolant conduit being disposed in thermal communication with said second water conduit within said heat exchanger and with said engine block cooling passage;
a circulation pump disposed in fluid communication with said first coolant conduit;
a thermostat disposed in thermal and fluid communication with said first coolant conduit;
an exhaust conduit connected in exhaust gas conducting communication with said engine; and
an exhaust conduit cooling passage disposed in thermal communication with said exhaust conduit and in fluid communication with said first water conduit.
12. The cooling system of claim 11 , wherein:
said first and second water conduits are connected in parallel with each other.
13. The cooling system of claim 11 , further comprising:
a second coolant conduit connected in fluid communication between said thermostat and said engine block inlet, said thermostat being disposed in fluid communication between said engine block outlet and said second coolant conduit.
14. The cooling system of claim 11 , further comprising:
an oil cooler disposed in fluid and thermal communication with said first coolant conduit.
15. The cooling system of claim 11 , further comprising:
a third water conduit connected in fluid communication with said water pump and in parallel fluid communication with said first water conduit; and
a fuel system module connected in thermal and fluid communication with said third water conduit.
16. The cooling system of claim 11 , further comprising:
a charge air cooler disposed in thermal and fluid communication with said first water conduit.
17. A cooling system of an outboard motor, comprising:
a water pump;
a first water conduit;
a second water conduit, said water pump being configured to draw water from a body of water in which said outboard motor is operating and induce that water to flow through said first and second water conduits;
an engine block having a plurality of cylinders formed therein;
an engine block cooling passage disposed in thermal communication with said plurality of cylinders, said engine block cooling passage having an engine block inlet and an engine block outlet;
an engine head attached to said engine block;
an engine head cooling passage disposed in thermal communication with a plurality of combustion chambers disposed within said engine head, said engine head cooling passage having an engine head inlet and an engine head outlet, said first water conduit being connected in fluid communication with said engine head cooling passage;
a heat exchanger;
a first coolant conduit, said first coolant conduit being disposed in thermal communication with said second water conduit within said heat exchanger and with said engine block cooling passage;
a circulation pump disposed in fluid communication with said first coolant conduit;
a thermostat disposed in thermal and fluid communication with said first coolant conduit;
an exhaust conduit connected in exhaust gas conducting communication with said engine;
an exhaust conduit cooling passage disposed in thermal communication with said exhaust conduit and in fluid communication with said first water conduit;
a second coolant conduit connected in fluid communication between said thermostat and said engine block inlet, said thermostat being disposed in fluid communication between said engine block outlet and said second coolant conduit.
18. The cooling system of claim 17 , wherein:
said first and second water conduits are connected in parallel with each other.
19. The cooling system of claim 18 , further comprising:
an oil cooler disposed in fluid and thermal communication with said first coolant conduit.
20. The cooling system of claim 19 , further comprising:
a third water conduit connected in fluid communication with said water pump and in parallel fluid communication with said first and second water conduits;
a fuel system module connected in thermal and fluid communication with said third water conduit; and
a charge air cooler disposed in thermal and fluid communication with said first water conduit.