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Title:
ELECTRIC PUMP
Document Type and Number:
Japanese Patent JP2005273648
Kind Code:
A
Abstract:

To provide an electric pump equipped with inscribed-type pump, and capable of increasing a life span.

The electric oil pump 10 comprises a stator 13 in which a core 14 being enwound by a coil 15 is embedded; a cylindrical permanent magnet 17 having a central axis being identical to that of the core 14, and positioned so as to face an inner peripheral side of the core 14; a cylindrical back yoke 16 fixed to an inner peripheral surface of the permanent magnet 17; an outer rotor 20 fixed to an inner peripheral surface of the back yoke 16; and an inner rotor 20 journaled while having a central axis A, which is eccentric from a central axis of the core 14. An inscribed-type pump is composed of the outer rotor 18 and the inner rotor 20. The inner peripheral surface of the back yoke 16 has a slide surface 16a projecting out in an axial direction to the outer rotor 18, and a housing 12 is equipped with a convex portion 12a having an identical central axis to that of the core 14. The back yoke 16 is journaled by an outer peripheral surface of the convex portion 12a on the slide surface 16a.


Inventors:
Ikegawa, Atsutoshi
Nakayoshi, Hideki
Application Number:
JP2004000357000
Publication Date:
October 06, 2005
Filing Date:
December 09, 2004
Export Citation:
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Assignee:
AISIN SEIKI CO LTD
International Classes:
F04C2/08; F04C2/10; F04C11/00; F04C15/00; (IPC1-7): F04C15/00; F04C2/10
Domestic Patent References:
JPS60149892A
JPH0663123A
JPH0842482A
JPS6081488A
JPH11343983A
JPH02277983A
JPS59167465A