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US 6,543,223 B2Granted
Drive device
AssigneeFesto AG & Co.
InventorsGünther Muschong, Kurt Stoll
Life of this patent
Estimating the term…
Abstract
A drive device comprising a closed hydraulic circuit which has a hydraulic drive adapted to be actuated by hydraulic medium and has a hydraulic pump responsible for the supply and removal of the hydraulic medium to and from the hydraulic drive. For the operation of the hydraulic pump an electric motor is provided. The activation of the hydraulic drive is controlled by the operational state of the hydraulic pump.
Claims35
A drive device comprising a closed hydraulic circuit, which includes a hydraulic drive able to be actuated by hydraulic medium and a hydraulic pump causing the supply and removal of such hydraulic medium in relation to the hydraulic drive, and furthermore an electric motor for operation of the hydraulic pump, activation of the hydraulic drive being dependent on the operational state of the hydraulic pump;
- wherein said hydraulic drive includes at least one drive piston drivingly coupled with a force output part, said drive piston dividing two working chambers in a fluid tight manner from one another, said working chambers being connected by way of a respective hydraulic circuit with the hydraulic pump, the supply of hydraulic fluid to the one working chamber taking place with the simultaneous escape of hydraulic fluid from the other working chamber;
- and
- wherein said two hydraulic circuits comprise an overridable check valve, which normally allows flow of fluid from the hydraulic pump to the hydraulic drive and prevents flow in the opposite direction, each check valve being able to be overridden by a pressure maintained in the respectively other hydraulic circuit by the hydraulic pump in order to render possible fluid flow from the hydraulic drive back to the hydraulic pump.
A drive device having at least one closed hydraulic circuit, said at least one closed hydraulic circuit comprising:
- a hydraulic drive able to be actuated by a hydraulic medium;
- a hydraulic pump causing the supply and removal of such hydraulic medium in relation to the hydraulic drive;
- wherein said hydraulic drive includes at least one drive piston drivingly coupled with a force output part, said drive piston dividing two working chambers in a fluid tight manner from one another, said working chambers being connected by way of a respective hydraulic circuit with the hydraulic pump, the supply of hydraulic fluid to the one working chamber taking place with the simultaneous escape of hydraulic fluid from the other working chamber;
- an electric motor for operation of the hydraulic pump, activation of the hydraulic drive being dependent on the operational state of the hydraulic pump;
- a biasing valve which only opens up the fluid connection from the respective working chamber to the hydraulic pump when and as long as a predetermined opening pressure obtains in the output working chamber;
- and
- a setting means for setting an adjustable leading value for the opening pressure.
4 more elements
A drive device having at least one closed hydraulic circuit, said at least one closed hydraulic circuit comprising:
- a hydraulic drive able to be actuated by a hydraulic medium;
- a hydraulic pump causing the supply and removal of such hydraulic medium in relation to the hydraulic drive;
- wherein said hydraulic drive includes at least one drive piston drivingly coupled with a force output part, said drive piston dividing two working chambers in a fluid tight manner from one another, said working chambers being connected by way of a respective hydraulic circuit with the hydraulic pump, the supply of hydraulic fluid to the one working chamber taking place with the simultaneous escape of hydraulic fluid from the other working chamber;
- an electric motor for operation of the hydraulic pump, activation of the hydraulic drive being dependent on the operational state of the hydraulic pump;
- a biasing valve which only opens up the fluid connection from the respective working chamber to the hydraulic pump when and as long as a predetermined opening pressure obtains in the output working chamber;
- and
- wherein said two hydraulic circuits comprise an overridable check valve, which normally allows flow of fluid from the hydraulic pump to the hydraulic drive and prevents flow in the opposite direction, each check valve being able to be overridden by a pressure maintained in the respectively other hydraulic circuit by the hydraulic pump in order to render possible fluid flow from the hydraulic drive, back to the hydraulic pump and wherein a relevant hydraulic circuit the overridable check valve, and the biasing valve are connected in series.
4 more elements
A drive device having at least one closed hydraulic circuit, said at least one closed hydraulic circuit comprising:
- a hydraulic drive able to be actuated by a hydraulic medium;
- a hydraulic pump causing the supply and removal of such hydraulic medium in relation to the hydraulic drive;
- wherein said hydraulic drive includes at least one drive piston drivingly coupled with a force output part, said drive piston dividing two working chambers in a fluid tight manner from one another, said working chambers being connected by way of a respective hydraulic circuit with the hydraulic pump, the supply of hydraulic fluid to the one working chamber taking place with the simultaneous escape of hydraulic fluid from the other working chamber;
- an electric motor for operation of the hydraulic pump, activation of the hydraulic drive being dependent on the operational state of the hydraulic pump;
- a adjustable biasing valve which only opens up the fluid connection from the respective working chamber to the hydraulic pump when and as long as a predetermined opening pressure obtains in the output working chamber;
- and
- wherein a check valve adapted to open toward the hydraulic drive and to close in the opposite direction is connected in parallel to each biasing valve.
4 more elements
A drive device having at least one closed hydraulic circuit, said at least one closed hydraulic circuit comprising:
- a hydraulic drive able to be actuated by a hydraulic medium;
- a hydraulic pump causing the supply and removal of such hydraulic medium in relation to the hydraulic drive;
- wherein said hydraulic drive includes at least one drive piston drivingly coupled with a force output part, said drive piston dividing two working chambers in a fluid tight manner from one another, said working chambers being connected by way of a respective hydraulic circuit with the hydraulic pump, the supply of hydraulic fluid to the one working chamber taking place with the simultaneous escape of hydraulic fluid from the other working chamber;
- an electric motor for operation of the hydraulic pump, activation of the hydraulic drive being dependent on the operational state of the hydraulic pump,
- a biasing valve which only opens up the fluid connection from the respective working chamber to the hydraulic pump when and as long as a predetermined opening pressure obtains in the output working chamber;
- and
- a setting means for setting an adjustable leading value for the opening pressure;
- and
- a pivoting clamping arm, wherein a force output part is connecting to said clamping arm and moves said clamping arm in a driving manner to form a toggle clamping device.
6 more elements
Dependencies are inferred from the claim text.