Pressure limiting valve with uncoupled valve closing body and tappet
US5190362A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Jul 8, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7928
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pressure limiting valve has a valve closing member (ball), which is subjected to a hydraulic opening force and is indirectly subjected to a closing force generated by a compression spring which avoids hysteresis that impairs the switching behavior of the pressure limiting valve. A tappet, which passes through a sealing ring and is exposed to a control pressure, is also capable of acting in a closing manner upon the pressure limiting valve. When there is no operative control pressure, the tappet is pushed back by the opening of the pressure limiting valve and is retained in this position by frictional forces brought about by a sealing ring. The switching plays of the pressure limiting valve are free of frictional forces. The pressure limiting valve is suitable for use in hydraulic motor vehicle brake systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.