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Title:
HYDRAULIC PUMP WITH BUILT-IN ELECTRIC MOTOR
Document Type and Number:
Japanese Patent JP2000303949
Kind Code:
A
Abstract:

To simultaneously perform cooling of an electric motor and contamination prevent of working oil by forming a housing of a hydraulic pump with a built-in electric motor as a metallic cylinder as an electric motor frame where a stator of the electric motor is installed inside, and separating the motor side space in the cylinder by a seal mechanism.

A housing is formed by a metallic cylinder 1 and end plates 2, 3, and a rotator 5 of an electric motor and a rotor 6 of a pump unit are respectively fixed on a rotating shaft 4 born by both end plates 2, 3 in the housing. A stator 7 of the electric motor is fixed in a position corresponding to the rotator 5 on the inner surface of the metallic cylinder 1, and further a case 8 of the pump unit is fixed to the front side end plate 2 to surround the rotor 6. The motor side space in the metallic cylinder 1 is separated from the space in the case 8 of the pump unit by an oil seal 9 as a seal mechanism mounted on the rotating shaft 4 in the tail end part of the case 8 of the pump unit to form the atmospheric space.


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Inventors:
HIRANO KENICHI
HASHIMOTO TOSHIO
KITAMURA TAKESHI
Application Number:
JP11488299A
Publication Date:
October 31, 2000
Filing Date:
April 22, 1999
Export Citation:
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Assignee:
YUKEN KOGYO CO LTD
International Classes:
F04B1/20; F04B9/00; F04B17/03; F04B23/02; F04B53/00; F04B53/08; F04B53/16; (IPC1-7): F04B1/20; F04B9/00; F04B53/00; F04B53/08; F04B23/02
Domestic Patent References:
JPS57198391A1982-12-04
JPH10164793A1998-06-19
JPH08103052A1996-04-16
JPS6394084A1988-04-25
JPS53146301A1978-12-20
JPS6121885U1986-02-08
JPS61122386U1986-08-01
JPH04244602A1992-09-01
JPH0469730U1992-06-19
JPH03127084U1991-12-20
JPH1182287A1999-03-26
JPH03107282U1991-11-05
JPH0717982U1995-03-31
JPH06215956A1994-08-05
JPH0821357A1996-01-23
Attorney, Agent or Firm:
Masatoshi Sato (1 person outside)



 
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