Pneumatic brake booster with two valves for allowing atmospheric air into a variable pressure chamber
US5056413A · kind A · utility
Inventor
Key dates
| Filing date | Jun 26, 1990 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | Jun 26, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B1/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a valve housing (30) a first and a second valve seat (32, 34) are arranged to which a common valve body (40) can be applied. In one position of an actuating member (38) the valve body (40) is lifted only from the first valve seat (32), two chambers (24, 26) of the brake booster (10) thereby being connected together and both separated from an air inlet (50). In another position of the actuating member (38) the valve body (40) is lifted from the second valve seat (34), the two chambers (24, 26) thereby being separated from each other and one of them connected to the air inlet (50). The valve assembly (28) comprises an additional venting channel (80) which opens into the chamber (26) of the brake booster (10) adapted to be connected to the air inlet (50) and is controlled by an additional valve (66, 72). The additional valve (66, 72) is adapted to be opened by a movement of the actuating member (38) which exceeds the movement necessary for lifting the valve body (40) from the second valve seat (34).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.