Patent ID: 7896626

Claim:
An electric pump using an inner-rotor type, brushless DC motor, wherein a casing of the electric pump is formed by a pump casing and a main casing; a sensor-stator assembly is disposed in a space between a side wall portion of the main casing and a can and is sealed with resin; a first elastic seal member is disposed, in a fluid-tight and compressed manner, between the can and the main casing; a second elastic seal member is disposed, in a fluid-tight and compressed manner, between the pump casing and the main casing; the pump casing and the main casing are fixed together; and wherein a shaft support portion is provided at a bottom plate portion of the main casing in such a manner that the shaft support portion projects toward the center of the interior of the main casing; a support shaft portion of a shaft is fixed and cantilevered to a blind hole formed in the shaft support portion; and a bearing is provided on a slide shaft portion of the shaft; wherein impeller vanes are integrally provided on a rotor main body of the inner-rotor type, brushless DC motor and a vent hole is formed in the rotor main body, the vent hole penetrating the rotor main body in a direction parallel to the shaft to provide fluid communication from a space behind said rotor main body to a space in front of said rotor main body; wherein an annular projection is provided on the interior side of the bottom plate portion; wherein the can has a wall thickness and elasticity such that the can is configured to press the first and second elastic seal members for establishing fluid tightness, and to press and hold the sensor-stator assembly; and wherein a press portion is formed at one end of the can, having three continuously formed surfaces including a first surface, a second surface and a third surface; the first surface being guided by means of the projection of the bottom plate portion, the second surface being pressed against a first the first elastic seal member for attaining fluid tightness, and the third surface abutting the inner surface of the bottom plate portion.