Hydraulic brake booster having charging and check valves
US4121421A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1977 |
| Grant date | Oct 24, 1978 |
| Priority date | — |
| Expiry date | Jan 6, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/143
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hydraulic brake booster includes a housing defining a pressure chamber and an inlet port communicating pressurized fluid to an accumulator and the pressure chamber. The housing includes a bore which slidably receives a charging valve and sealingly receives a check valve. The charging valve sealingly engages the housing bore via a sealing ring in one position and is pressure responsive to move toward a second position abutting the check valve to open communication between the inlet port and the accumulator. A stem is slidably carried in a passage in the check valve and the stem is received in a slot in the charging valve. An operator actuator is engageable with the stem to unseat one end of the stem from the check valve so that pressurized fluid from the accumulator is communicated to the pressure chamber. Moreover, the slot on the charging valve permits communication between the inlet port and the pressure chamber when the accumulator pressure is below the pressure at the inlet port and the operator actuator is unseating the stem from the check valve. In addition, the charging valve and housing bore include substantially parallel tapered surfaces that oppose frusto conical surfac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.