Electric Water Pump

Abstract

An electric water pump may include a stator generating a magnetic field, a rotor rotated by the magnetic field, a pump cover, a body having a volute chamber with the pump chamber, a stator chamber and a rotor chamber, the stator being mounted in the stator chamber and the rotor being mounted in the rotor chamber, a shaft fixed to the rotor, an impeller fixed to the shaft in the volute chamber, a driver case mounted at a rear end of the body and having a rear surface opened backward and formed of a driver chamber therein, and a driver mounted in the driver chamber and applying a control signal to the stator, wherein the case surface is provided with an insert portion protruded forward from an external circumference thereof and inserted in a rear end portion of the body, and a fixing groove in which the insert portion is inserted.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims priority to Korean Patent Application No. 10-2009-0112234 filed on Nov. 19, 2009, the entire contents of which is incorporated herein for all purposes by this reference.BACKGROUND OF THE PRESENT INVENTION[0002]1. Field of the Present Invention[0003]The present invention relates to an electric water pump. More particularly, the present invention relates to an electric water pump having improved performance and durability.[0004]2. Description of Related Art[0005]Generally, a water pump circulates coolant to an engine and a heater in order to cool the engine and heat a cabin. The coolant flowing out from the water pump circulates through and exchanges heat with the engine, the heater, or the radiator, and flows back in the water pump. Such a water pump is largely divided into a mechanical water pump and an electric water pump.[0006]The mechanical water pump is connected to a pulley fixed to a crankshaft of the e...

AI Technical Summary

Benefits of technology

[0010]Various aspects of the present invention are directed to provide an electric water pump having advantages of improved performance and durability.

[0013]A first bearing may be disposed between the shaft and the front surface of the body in order to reduce rotational friction of the shaft, wherein the rotor is formed in an unsymmetrical shape so as to generate thrust toward the front surface of the body.

[0014]A cup may be mounted between the first bearing and the rotor on the shaft in order to prevent interference and collision of the shaft and the first bearing by the thrust, and a thrust ring is mounted between the cup and the first bearing for smooth rotation of the shaft, wherein the cup is made of a rubber material and the thrust ring is made of a ceramic material.

[0015]A second bearing may be disposed between a rear end portion of the shaft and the front surface of the driver case in order to reduce the rotational friction of the shaft, wherein the second bearing is disposed between a step portion of the shaft at a rear side thereof and the front surface of the driver case in order to reduce the rotational friction of the shaft.

[0021]The rotor case may be made of a bulk mold compound including a potassium family that has a low coefficient of contraction, wherein a first bearing is disposed between the shaft and the front surface of the body in order to reduce rotational friction of the shaft and wherein a cup is mounted between the first bearing and the rotor on the shaft in order to prevent interference and collision of the shaft and the first bearing by a thrust, and a thrust ring is mounted between the cup and the first bearing for smooth rotation of the shaft.

Problems solved by technology

However, if the engine speed is increased, fuel consumption of a vehicle also increases.

Images