Abstract: A water pump for a vehicle may include a water pump housing, a water pump drive shaft, a bearing, a first rotation plate connected to one end of the water pump drive shaft, a first magnet mounted on one surface of the first rotation plate, an impeller rotation shaft coaxially disposed with the water pump drive shaft, an impeller bearing rotatably enclosing an exterior circumference of the impeller rotation shaft, a second rotation plate connected to one end of the impeller bearing, a second magnet mounted on one surface of the second rotation plate, and an impeller connected to the other end of the impeller bearing, wherein the one surface of the first rotation plate and the one surface of the second rotation plate may be disposed apart from and face each other, and facing poles of the first and second magnets may be different from each other.

Abstract: A drain system of a water pump for a vehicle according to an exemplary embodiment of the present invention may include: a drain hole formed at a water pump housing, wherein coolant having leaked from the water pump passes the drain hole; a drain chamber formed in the water pump housing and providing a space communicated with the drain hole; a drain plug disposed in the drain chamber and collecting the coolant passing the drain hole; and a plug penetration hole penetrating the drain plug so as to communicate an inside of the drain plug to an outside of the water pump housing, wherein a part of the coolant collected in the drain plug may be vaporized and be exhausted to the outside of the water pump housing through the plug penetration hole.

Abstract: An engine cooling system for a vehicle may include a cooling unit that circulates coolant through a cooling line connecting a water jacket, a water pump, and a radiator of an engine to cool the engine, and a sub-cooling unit that selectively circulates coolant through a sub-cooling line connecting the engine with a refrigerator so as to cool the engine.

Abstract: A water pump for a vehicle may include a water pump housing, a water pump drive shaft, a bearing, a first rotation plate connected to one end of the water pump drive shaft, a first magnet mounted on one surface of the first rotation plate, an impeller rotation shaft coaxially disposed with the water pump drive shaft, an impeller bearing rotatably enclosing an exterior circumference of the impeller rotation shaft, a second rotation plate connected to one end of the impeller bearing, a second magnet mounted on one surface of the second rotation plate, and an impeller connected to the other end of the impeller bearing, wherein the one surface of the first rotation plate and the one surface of the second rotation plate may be disposed apart from and face each other, and facing poles of the first and second magnets may be different from each other.

Abstract: A drain system of a water pump for a vehicle according to an exemplary embodiment of the present invention may include: a drain hole formed at a water pump housing, wherein coolant having leaked from the water pump passes the drain hole; a drain chamber formed in the water pump housing and providing a space communicated with the drain hole; a drain plug disposed in the drain chamber and collecting the coolant passing the drain hole; and a plug penetration hole penetrating the drain plug so as to communicate an inside of the drain plug to an outside of the water pump housing, wherein a part of the coolant collected in the drain plug may be vaporized and be exhausted to the outside of the water pump housing through the plug penetration hole.