Hydraulic unit and method for providing a pressurized hydraulic fluid
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Abstract
An hydraulic unit provides a pressurized hydraulic fluid at an outlet. The unit has an electric motor and a pump operated by the motor for generating pressure. A reservoir having a variable compensation volume stores the hydraulic fluid primed by the pump in a gas-free manner. The hydraulic fluid is especially pressurized in order to safely and reliably guarantee that the hydraulic fluid is gas-free. The inventive design allows for the safe and operationally reliable use of the hydraulic unit even at high acceleration values. The hydraulic unit is especially adapted for use in an industrial robot.
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Citations
43 Claims
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1-20. -20. (canceled)
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21. An hydraulic unit for providing a pressurized hydraulic fluid at an outlet, comprising:
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an electric motor;
at least one pump for pressure generation driven by said electric motor;
a storage space configured with a variable compensating volume; and
an amount of the hydraulic fluid enclosed free of gas in said storage space and fluidically connected to a suction side of said at least one pump. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method of providing a pressurized hydraulic fluid, which comprises:
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providing an hydraulic unit and driving a pump of the hydraulic unit for pressure generation with an electric motor;
supplying the pump with hydraulic fluid from a storage space having a variable compensating volume, wherein the hydraulic fluid is stored in the compensating volume free of gas.
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Specification