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.
JPH11156412A | 1999-06-15 | |||
JPH10331803A | 1998-12-15 | |||
JPS58102807A | 1983-06-18 | |||
JPS5416634A | 1979-02-07 | |||
JP2000264034A | 2000-09-26 | |||
JPH09174300A | 1997-07-08 | |||
JPH0238020A | 1990-02-07 | |||
JPS6323002A | 1988-01-30 | |||
JPH08145007A | 1996-06-04 | |||
JPH09128023A | 1997-05-16 |