Load sensing pump control for a variable displacement pump
US5876185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1996 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Nov 20, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2205/16
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable displacement pump has a discharge passage and a displacement controller disposed to decrease pump displacement in response to an increasing pressure signal and to increase pump displacement in response to a decreasing pressure signal. A load sensing pump control for the pump includes a displacement control valve having an input port connected to the discharge passage and a signal port connected to the displacement controller. A valve spool controls communication between the input and signal ports and is biased in a direction to block the inlet port from the signal port by a spring. The spool has a differential area for exerting a force against the spool in opposition to the spring force proportional to the pump discharge pressure entering the valve through the input port. A variable force can be selectively exerted against the spool in opposition to the spring force to change the displacement of the pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.