Braking assistance pneumatic servomotor with improved valve
US5848827A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Dec 15, 1998 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/57
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pneumatic brake booster for providing braking assistance. The brake booster has a housing (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 (30,130). The three way valve structure have a valve member (36,136) which cooperates through an a first annular face (40,140) with a first annular valve seat (34,134) formed on a plunger (28,128) which slides in a bore (26,126) of a piston (20,90). The annular face (40,140) of the valve member (36,136) being urged forward in the direction of the annular valve seat (34,134) by a valve spring (42,142). The three way valve structure further includes a second valve member (46,146) which cooperates through an annular face (50,150) with a second annular valve seat (44,144) formed on the plunger (28,128). The annular face (50,150) of the second valve member (46,146) being urged rearwards in the direction of the s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.