Pneumatic brake booster with reduced response force
US6272969A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | May 10, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/565
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pneumatic brake booster (10) has a booster housing (12), the interior of which is subdivided by at least one movable wall (22) into a vacuum chamber (24) and a working chamber (26). Projecting into the booster housing (12) is a control valve (28) which, after a response force acting counter to its operating direction has been overcome, controls a pneumatic pressure difference acting upon the movable wall (22). The control valve (28) is operable both by means of a mechanical input element (36) and, independently thereof, by means of an electromagnetic arrangement (48) comprising a coil (58) and an armature (50), which are displaceable relative to one another along the operating direction. To reduce the response force which has to be overcome by a user, a device for detecting an operation of the control valve (28) effected by means of the mechanical input element (36) is provided which, once such an operation has been detected, during said operation prompts an energizing of the electromagnetic arrangement (48) of an intensity sufficient to reduce the response force of the control valve (28) yet not increase the braking force provided by the brake booster in accordance with the oper…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.