Hydraulic pump unloader
US4911615A · kind A · utility
9Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1989 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Jan 24, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7762
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An unloader device for controlling the output of a hydraulic pump, for example, in a constant pressure-type motor vehicle braking circuit. Delivery to hydraulic accumulators in the circuit is halted by a resilient seal defining an annulus forming part of the inlet fluid flow path to the pump and to which the pump delivery pressure is applied to expand the seal in the sense to close the annulus, by a valve operable when the delivery pressure reaches a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.