Pneumatic brake booster of the tandem type
US5154106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1991 |
| Grant date | Oct 13, 1992 |
| Priority date | — |
| Expiry date | Jun 17, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/569
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pneumatic brake booster of the tandem type for the brake boosting of motor vehicles, comprises a movable hub (15) driving a push rod (11) by of a reaction disk (17), a closed containment composed of a front shell (1) on the same side as the master cylinder and of a rear shell (3) on the same side as the actuating pedal, which define a front chamber and a rear chamber separated by a separating element (5) having an annular partition (9), and a front piston (25) and a rear piston (35) respectively arranged coaxially in the front and rear chambers. These chambers are themselves respectively divided by a sealing diaphragm (27, 37) fixed to each of the pistons (25, 35), in order to define, within each of these, a sub-chamber of constant pressure (21, 31) and a sub-chamber of variable pressure (23, 33), the pistons (25, 35) being movable in the axial direction under the effect of the differences in the pressures prevailing between the sub-chambers of each chamber. The annual partition (9) of the separating element (5) is simply put in place and bears on the bottom of the rear shell (3) of the containment, and the pistons (25, 35) are fixed to one another and to the movable hub (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.