Hydraulic brake booster and valve member
US4281585A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1980 |
| Grant date | Aug 4, 1981 |
| Priority date | — |
| Expiry date | Jan 16, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/148
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hydraulic brake booster includes a housing which defines a pressure chamber and a piston within the housing is movable in response to pressurized fluid within the pressure chamber to effectuate a brake application. The piston encloses a storage chamber and forms a passage communicating the storage chamber with the pressure chamber. A valve member is disposed within the passage to control communication between the storage chamber and the pressure chamber. An operator actuator cooperates with a control valve to communicate pressurized fluid to the pressure chamber and a finger is actuated by the operator actuator to engage the valve member, thereby opening communication between the storage chamber and the pressure chamber. The valve member comprises a unitary assembly having a sleeve sealingly engaging the wall of the piston passage, a seat member biased into engagement with a shoulder defined by a stepped bore on the sleeve, and a stem extending through a bore on the seat member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.