Hydraulic brake booster with integral accumulator
US4217758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1978 |
| Grant date | Aug 19, 1980 |
| Priority date | — |
| Expiry date | Nov 20, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/148
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hydraulic brake booster is disclosed which includes an integral accumulator to provide a fluid pressure source for emergency failsafe braking. The accumulator includes a bore defined within the booster housing, and a piston slidably mounted in the bore which divides the latter into a pair of fluid compartments between opposite ends of the piston and corresponding ends of the bore. One of the compartments is communicated to the booster inlet port so that the compartment is charged with fluid pressure whenever the pressure level at the inlet port is above some predetermined low value. In one embodiment of the invention, the other compartment is communicated to the fluid pressure reservoir, and a relief valve is carried within the piston which controls flow of fluid between the two compartments. In the other embodiment of the invention, the relief valve is installed in the passage communicating the inlet port to the one compartment, so that when the fluid pressure level in the one compartment reaches a predetermined value, the one compartment is vented to the inlet port. Therefore, when the pressure level in the one compartment reaches some predetermined, relatively high value, the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.