Regulating device for pump pressure and pump volumetric flow rate, having concentric control slide valves
AssigneeRobert Bosch GmbH
InventorAndreas Apperger
Life of this patent
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Abstract
A regulating device for use with a pump that has a hydraulically adjustable displacement volume, wherein the regulating device includes an inflow port, a return flow port, an actuating port, a control port, a first control slide valve, and a second control slide valve. The first control slide valve is linearly movable with respect to a center axis, the first control slide valve defining first and second orifices, which are adjustable jointly and in opposite directions. The second control slide valve is linearly movable and defines third and fourth orifices, which are adjustable jointly and in opposite directions. The second control slide valve is accommodated in a linearly movable manner within the first control slide valve.
Claims14
A regulating device for use with a pump that has a hydraulically adjustable displacement volume, the regulating device comprising:
- an inflow port;
- a return flow port;
- an actuating port;
- a control port;
- a first control slide valve, which is linearly movable with respect to a center axis, the first control slide valve defining a first orifice and a second orifice, the first and second orifices being adjustable jointly and in opposite directions;
- a linearly movable second control slide valve, said second control slide valve defining a third orifice and a fourth orifice, the third and fourth orifices being adjustable jointly and in opposite directions;
- a fifth orifice;
- and
- a sixth orifice,
- wherein the second control slide valve is accommodated in a linearly movable manner within the first control slide valve,
- wherein a first fluid flow path runs from the actuating pressure port, via the fifth orifice, onward via a control region, onward via the sixth orifice, to the return flow port,
- wherein a second fluid flow path runs from the actuating pressure port, via the second orifice, onward via the control region, onward via the fourth orifice, to the return flow port, and
- wherein the control region is formed, at least in some sections, by a cavity within the second control slide valve.
A regulating device for use with a pump that has a hydraulically adjustable displacement volume, the regulating device comprising:
- an inflow port;
- a return flow port;
- an actuating port;
- a control port;
- a first control slide valve, which is linearly movable with respect to a center axis, the first control slide valve defining a first orifice and a second orifice, the first and second orifices being adjustable jointly and in opposite directions;
- and
- a linearly movable second control slide valve, said second control slide valve defining a third orifice and a fourth orifice, the third and fourth orifices being adjustable jointly and in opposite directions,
- wherein the second control slide valve is accommodated in a linearly movable manner within the first control slide valve, and
- wherein:
- the first control slide valve is configured such that a pressure at the inflow port is regulatable to a first predefined value, and/or
- the second control slide valve is configured such that a difference between the pressure at the inflow port and a pressure at the control port is regulatable to a second predefined value.
Dependencies are inferred from the claim text.