Brake booster with high kick-off emergency valve
US6912850B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2001 |
| Grant date | Jul 5, 2005 |
| Priority date | — |
| Expiry date | Apr 27, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/573
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A braking device for a motor vehicle, including a master cylinder (2) with a primary piston (3) subjected to an actuating force of an input force exerted by a manual operating member (4) and a boost force exerted by a booster (6) coupled to the manual operating member (4) and an emergency assist valve (VA). Valve (VA) comprises: a reaction piston (19) sliding in a bore (20) of the primary piston (3) and urged toward a position of rest by by an elastic return member (22); a rapid piston (32) having a cross section smaller than the reaction piston (19) and sliding in a sealed manner in a bore (31) of a bushing (30) in bore (200; and a ratio control (27) actuated by a plunger distributor (10) driven by the manual operating member (4). The elastic return member (22) is arranged outside of the primary piston (3) and a transmission element (T) is provided to transmit a return force of the elastic return member (22) to the reaction piston (19).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.