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US 2013/0074487 A1Published application
Drive system having at least one hydraulic actuator
AssigneeHydac Electronic GmbH
InventorsFrank Herold, Kai Remus, Frank Kattler
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AssigneeHydac Electronic GmbH
InventorsFrank Herold, Kai Remus, Frank Kattler
Estimating the term…
The invention relates to a drive system having at least one hydraulic actuator (2), which is supplied with pressure medium (4) by means of at least one pressure-medium pump (3) in a main circuit, the pressure-medium pump (3) being a rotational-speed-controlled pressure-medium pump that is driven by a motor (5) at a variable rotational speed and a controlled torque, said drive system being characterized in that leakage fluid (7) that escapes from a displacement chamber (6) of the pressure-medium pump (3) is discharged through a fluid-conducting connection (8) having at least one check valve (9, 16), and the at least one check valve (9, 16) is installed in the fluid-conducting connection (8) in such a way that the check valve prevents pressure medium from flowing back out of the main circuit into the displacement chamber (6) or another interior chamber of the pressure-medium pump (3) and feeds leakage fluid (7) into the main circuit of the drive system (1) when there is a slight excess pressure.
A drive system having at least one hydraulic actuator (2), which is supplied with a pressure medium (4) by means of at least one pressure medium pump (3) in a main circuit, wherein the pressure medium pump (3) is a speed-controlled pressure medium pump, which is driven by a motor (5) at a variable speed and a controlled torque, characterized in that the leakage fluid (7), escaping from a displacement chamber (6) of the pressure medium pump (3), is discharged through a fluid-conducting connection (8) having at least one check valve (9, 16), and that the at least one check valve (9, 16) is installed in the fluid-conducting connection (8) in such a way that the check valve prevents the pressure medium from flowing back out of the main circuit into the displacement chamber (6) or another interior chamber of the pressure medium pump (3) and feeds the leakage fluid (7) into the main circuit of the drive system (1) when there is a slight excess pressure.
Dependencies are inferred from the claim text.