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Title:
HYDRAULIC DEVICE
Document Type and Number:
Japanese Patent JP2004263645
Kind Code:
A
Abstract:

To provide a hydraulic device allowing stable pushing.

The hydraulic device has a hydraulic pump 1 that is driven by an electric motor 6 and is rotatable in both directions, and both ports 14 and 16 of a hydraulic cylinder 12 are connected to both ports 2 and 4 of the hydraulic pump 1 via a pair of flow channels 8 and 10, respectively. In a pushing state of the hydraulic cylinder 12, a throttle 32 is disposed in a leak flow channel 30 communicating the flow channel 10 on the high pressure side of the pair of flow channels 8 and 10 to the low pressure side. The hydraulic device has a position control circuit 38 for controlling the electric motor 6 based on a position detected by a movement detecting sensor 34 for detecting movement by the hydraulic cylinder 12, a pressure control circuit 40 for controlling the electric motor 6 based on the pressure of the flow channel 10 on the high pressure side detected by a pressure sensor 36, and a switching circuit 42 for switching the control by the position control circuit 38 to that by the pressure control circuit 40.


Inventors:
YOGO TERUAKI
Application Number:
JP2003056259A
Publication Date:
September 24, 2004
Filing Date:
March 03, 2003
Export Citation:
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Assignee:
OPTON KK
International Classes:
F04B49/06; F15B9/09; F15B21/08; (IPC1-7): F04B49/06
Domestic Patent References:
JPH11156412A1999-06-15
JPH10331803A1998-12-15
JPS58102807A1983-06-18
JPS5416634A1979-02-07
JP2000264034A2000-09-26
JPH09174300A1997-07-08
JPH0238020A1990-02-07
JPS6323002A1988-01-30
JPH08145007A1996-06-04
JPH09128023A1997-05-16
Attorney, Agent or Firm:
Tsutomu Adachi