Braking assistance pneumatic servomotor with improved valve
US6067891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/569
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pneumatic brake booster for providing braking assistance. The brake booster has an envelope (10) with an axis of symmetry (X-X') separated sealingly by at least one movable partition (12) to define at least a first chamber (14) connected permanently to a source of low pressure and at least a second chamber (16). The second chamber (16) being selectively connected to the first chamber (14) or a source of high pressure through a three way valve structure actuated by a control rod (30). The control rod (30) being capable of bearing, through the intermediary of a front face of a plunger (28) and a reaction disc (50) with a rear face of a thrust rod (48). The plunger (28) sliding in a bore (26) in the movable partition (12). The three way valve further including a valve member (36) disposed in a tubular rear part (22) of the movable partition (12) and co-operating through an annular front face (40) with a first valve seat (28a) formed on the plunger (28) and with a second valve seat (20a,20b) formed on the movable partition (12). The tubular part (22) having a space (35) located between the first (40) and second (20a,20b) valve seats and communicating with at least one radial passage …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.