Back to results
US 5,476,031 AGranted
Hydraulic setting device
AssigneeRobert Bosch GmbH
InventorsHelmut Rembold, Martin Muller
Life of this patent
Estimating the term…
Abstract
The hydraulic setting device (10) has a differential cylinder (11) whose pressure spaces (14, 18) can each be acted upon by a pump (17). The pressure conduits (15) and (19) between the pump and the two pressure spaces (14) and (18) are connected to a control valve (31) by means of control conduits (29) and (33). A part pressure can be set in the pressure spaces (14) and (18) by spilling pressure medium by corresponding activation of the control valve.
Claims7
A hydraulic setting device, comprising a hydraulic pump;
- a differential cylinder having a differential piston subdividing said cylinder into two pressure spaces;
- an electromagnetically actuated control valve arranged so that in each of said pressure spaces in said differential cylinder a part pressure is set by a partial spilling of pressure medium via said electromagnetically actuated control valve which part pressure can be varied as a function of certain criteria by corresponding activation of said control valve while hold pressures which are very much smaller than adjustment pressures are set in the case of a stationary position of said differential piston;
- and two conduit devices including a first conduit device emerging from said hydraulic pump and opening into a first pressure space of said pressure spaces and a second conduit device emerging from said hydraulic pump and opening into a second pressure space of said pressure spaces, said electromagnetically actuated control valve being connected between said two conduit devices, said control valve in a stationary position of said differential piston being pulse controlled so that a respective one of said pressure spaces acting against a return force of the hydraulic setting device at said differential piston is filled with such a pressure that a pressure force built in said one pressure space at said differential piston is equal to a return force acting on said differential piston.
A hydraulic setting device, comprising a hydraulic pump;
- a differential cylinder having a differential piston subdividing said cylinder into two pressure spaces;
- an electromagnetically actuated control valve arranged so that in each of said pressure spaces in said differential cylinder a part pressure is set by a partial spilling of pressure medium via said electromagnetically actuated control valve which part pressure can be varied as a function of certain criteria by corresponding activation of said control valve while hold pressures which are very much smaller than adjustment pressures are set in the case of a stationary position of said differential piston;
- and two conduit devices including a first conduit device emerging from said hydraulic pump and opening into a first pressure space of said pressure spaces and a second conduit device emerging from said hydraulic pump and opening into a second pressure space of said pressure spaces, said electromagnetically actuated control valve being connected between said two conduit devices;
- and a shut-off valve arranged in each of said pressure conduit devices, said shut-off valve in one of said pressure conduit devices being controlled by a pressure in the other of said pressure conduit devices.
1 more element
A hydraulic setting device, comprising a hydraulic pump;
- a differential cylinder having a differential piston subdividing said cylinder into two pressure spaces;
- an electromagnetically actuated control valve arranged so that in each of said pressure spaces in said differential cylinder a part pressure is set by a partial spilling of pressure medium via said electromagnetically actuated control valve which part pressure can be varied as a function of certain criteria by corresponding activation of said control valve while hold pressures which are very much smaller than adjustment pressures are set in the case of a stationary position of said differential piston;
- and two conduit devices including a first conduit device emerging from said hydraulic pump and opening into a first pressure space of said pressure spaces and a second conduit device emerging from said hydraulic pump and opening into a second pressure space of said pressure spaces, said electromagnetically actuated control valve being connected between said two conduit devices;
- and a shut-off valve arranged in each of said pressure conduit devices, said shut-off valve in one of said pressure conduit devices being controlled by a pressure in the other of said pressure conduit devices;
- and a throttle arranged in each of said pressure conduit devices.
2 more elements
Dependencies are inferred from the claim text.