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US 8,312,716 B2Granted
Hydraulic drive system
AssigneeLiebherr-Machines Bulte SA
InventorsMichael Deeken, Volker Gliniorz
Life of this patent
Estimating the term…
Abstract
The present invention relates to a hydraulic drive system having a pressure-regulated hydraulic pump for the provision of a system pressure and having a secondarily regulated hydraulic motor. In accordance with the invention, a control is provided which sets the desired system pressure during operation in dependence on an operating parameter of the hydraulic motor.
Claims19
A hydraulic drive system comprising:
- a pressure-regulated hydraulic pump, the pressure-regulated hydraulic pump effective to provide a system pressure;
- a secondarily regulated hydraulic motor in communication with the pressure-regulated hydraulic pump;
- and
- a control in communication with the pressure-regulated hydraulic pump and the secondarily regulated hydraulic motor, the control effective to monitor at least one operating parameter of the hydraulic motor, increase the system pressure for the pressure-regulated hydraulic pump when the at least one operating parameter indicates a need for increased system pressure and decrease the system pressure for the pressure-regulated hydraulic pump when the at least one operating parameter indicates a need for decreased system pressure, set the desired system pressure to at least two different pressure stages, and to change from a normal pressure stage to a high pressure stage when the adjustment angle of the adjustable secondarily regulated hydraulic motor reaches a maximum adjustment angle in a displacement direction.
1 more element
A hydraulic drive system comprising:
- a pressure-regulated hydraulic pump for the provision of a system pressure;
- and
- a secondarily regulated hydraulic motor, wherein
- a control is provided which sets the desired system pressure during operation in dependence on an operating parameter of the hydraulic motor;
- and further comprising
- at least one high pressure store connected or connectable to the hydraulic circuit of the hydraulic pump and the hydraulic motor;
- and
- at least two high pressure stores alternately connectable to the hydraulic circuit by the control.
5 more elements
A hydraulic drive system comprising:
- a pressure-regulated hydraulic pump, the pressure-regulated hydraulic pump effective to provide a system pressure;
- a secondarily regulated hydraulic motor in communication with the pressure-regulated hydraulic pump;
- and
- a control in communication with the pressure-regulated hydraulic pump and the secondarily regulated hydraulic motor, the control effective to monitor at least one operating parameter of the hydraulic motor, increase the system pressure for the pressure-regulated hydraulic pump when the at least one operating parameter indicates a need for increased system pressure and decrease the system pressure for the pressure-regulated hydraulic pump when the at least one operating parameter indicates a need for decreased system pressure, set the desired system pressure to at least two different pressure stages, and change from a high pressure stage to a normal pressure stage when the adjustment angle of the adjustable secondarily regulated hydraulic motor falls below a specific value.
1 more element
Dependencies are inferred from the claim text.