Mitsuba Corporation

Mitsuba Electric Manufacturing Co., Ltd.

Bunji Honma

Yoichi Shindo

Nobuyasu Sadakata

Hideyuki Iwamoto

Akira Yomoda

An impeller for liquid pump that is capable of improving pump efficiency by modifying a shape of the impeller. An impeller is rotatably provided in a pump section of a fuel pump. A plurality of through holes are formed in the impeller so as to extend in an axial direction adjacent a circumference of a disk plate member. By doing so, a plurality of vanes and an outer-radial side ring portion are formed. An intake portion for the liquid, that is, a radial inner surface of the through hole that guides the liquid is inclined so that its rotating direction leading side is positioned to the inner-radial side, and thereby, a wider fluid guiding area is secured.

Impeller of liquid pump

A fuel pump wherein the inner cylinder 37 for forming the fuel duct 38, in the outer cylinder 14, is provided between the stator 34 and the rotor 32 of the brushless motor 12, one end portion of the inner cylinder 37 is blockaded by the holder plate 41. The contacting pipe 44 for connecting from the fuel duct 38 to the delivery duct 21 is protrudely provided at the holder plate 41, and the control circuit unit 13 of the brushless motor 12 is held thereon. A resin sealed portion 52 is formed between the outer cylinder 14 and the inner cylinder 37, and the circumference of the control circuit unit 13 in the inner cylinder 37 by a potting method. The fuel 54 is lead from the introductory duct 16 to the fuel duct 38 of the inner cylinder 37, and is delivered from the delivery duct 21 through the insides of the fuel duct 38 and the contacting pipe 44. Since the fuel 54 does not contact on the resin sealed portion 52 and the control circuit unit 13, it is possible to prevent electric corrosion, conduction and a short of the resin sealed portion 52 and the control circuit unit 13 by the fuel 54.

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Ohta, Japan

Bunji Honma