Engine cooling apparatus
An engine cooling apparatus configured to circulate cooling water between an engine and a radiator is provided. A cylinder is provided on an upper part of a crankcase in the engine and the radiator is configured to radiate heat of the cooling water that has passed through the engine. The engine cooling apparatus includes a water pump configured to eject cooling water toward the engine, and a thermostat configured to send cooling water to the radiator in response to a cooling water temperature. The water pump is attached to the crankcase from an outside in a vehicle width direction. The thermostat is attached to the water pump from an inside in the vehicle width direction. The thermostat overlaps the crankcase in a front view of the engine.
1. An engine cooling apparatus configured to circulate cooling water between an engine and a radiator, wherein a cylinder is provided on an upper part of a crankcase in the engine and the radiator is configured to radiate heat of the cooling water that has passed through the engine, the engine cooling apparatus comprising:
a water pump configured to eject cooling water toward the engine; and
a thermostat configured to send cooling water to the radiator in response to a cooling water temperature, wherein
the water pump is attached to the crankcase from an outside in a vehicle width direction,
the thermostat is attached to the water pump from an inside in the vehicle width direction,
the thermostat overlaps the crankcase in a front view of the engine,
the water pump includes an impeller configured to pump cooling water,
the thermostat is positioned inside the impeller in the vehicle width direction,
the radiator is positioned in front of the cylinder, and
the thermostat is positioned above the impeller and between the radiator and the impeller.
2. The engine cooling apparatus according to claim 1 , wherein
the water pump includes a water pump case in which one surface thereof is opened and a water pump cover that covers an opening of the water pump case, and the water pump case is attached to the crankcase, and
a part of the water pump cover protrudes in a direction perpendicular to the vehicle width direction with respect to the water pump case, to form a thermostat case that houses the thermostat.
3. The engine cooling apparatus according to claim 2 , further comprising:
a thermostat cover that covers a housing chamber of the thermostat and is attached to the thermostat case, and
a pipe for pipe joint is-formed at the thermostat cover,
wherein an inclination of the pipe is parallel to an inclination of an exhaust pipe extending downward from the cylinder, and a tip end of the pipe is directed to an outside in the vehicle width direction.
4. The engine cooling apparatus according to claim 1 , further comprising:
a radiator pipe extending from the radiator and connected to the water pump from above the engine, an oil cooler pipe extending from an oil cooler and connected to the water pump from below the engine, and a bypass pipe that bypasses the radiator and connected to the water pump from behind the engine.
5. The engine cooling apparatus according to claim 1 , wherein
the water pump includes a water pump case,
the water pump case is provided with an ejection port through which the cooling water is fed into the crank case, and
the ejection port and the thermostat are arranged in the front-rear direction of the engine at substantially the same height.
6. The engine cooling apparatus according to claim 5 , further comprising:
a thermostat cover that covers a housing chamber of the thermostat and is attached to the water pump from the inside in the vehicle width direction, and
an outlet pipe that returns from the radiator to the water pup is connected to the thermostat cover,
wherein the ejection port is disposed at a rear side of the thermostat cover in a side view of the engine.