Hydrostatic drive system
US5931078A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1997 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Apr 18, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/75
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydrostatic drive system has a demand-responsive pump and at least one hydraulic circuit or consumer connected to it. Each consumer can be actuated by a directional control valve which acts as a throttle in intermediate positions. For the distribution of the delivery flow independently of the load, a pressure-maintaining valve is located upstream of the directional control valve. The pressure-maintaining valve can be controlled by a differential signal formed from a load pressure signal and a delivery pressure signal. The load pressure signal to the pressure-maintaining valve of the consumer can be changed by the output signal of a pressure reducing valve. One control surface of the pressure-maintaining valve can be pressurized with the output-side pressure of the pressure reducing valve which is located in a load pressure line. The output pressure of the pressure reducing valve can be adjusted by a spring and a variable control pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.