Power booster with mechanical panic assist function
US6561075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2001 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Jul 12, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/57
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A power booster for a brake system including a housing having an interior and a diaphragm separating the interior of the housing into at least two chambers. A power piston is coupled for movement with the diaphragm and includes an output member. A reaction member is coupled to the power piston, and an input member is adapted to be coupled to a movable brake pedal. An air valve assembly moves between open and closed positions to selectively admit atmospheric air into at least one of the chambers. This induces an output force on the diaphragm that is transferred to the output member of the power piston. The air valve assembly includes a portion adapted to engage the reaction member in response to an input force applied to the input member and is length adjustable between the input member and the reaction member. The air valve assembly operates at a first length when an input force is applied to the input member at a first rate and the air valve assembly operates at a second length shorter than the first length when an input force is applied to the input member at a second, higher rate. This lowers the input force needed to maintain a constant output force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.