Patent · US Expired

Hydraulic brake system with hydraulic brake force boosting

US4708404A · kind A · utility

25Cited by

12References

4Claims

0Family size

Assignee

Alfred Teves GmbH · DE

Inventors

Wolfram Seibert · Darmstadt, DE
Norbert Ocvirk · Offenbach, DE
Juergen Schonlau · Eltville am Rhein, DE

Key dates

Filing date	Jan 23, 1986
Grant date	Nov 24, 1987
Priority date	—
Expiry date	Jan 23, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60T13/161
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A brake system with hydraulic brake force boosting comprises a master cylinder (1), to which the wheel brakes (36 to 39, 36' to 39') are connected, as well as of an auxiliary-pressure supply system (11, 12) and of an auxiliary-pressure control valve (10) which causes an auxiliary pressure proportional to the pedal force (F). Inserted into the pressure fluid conduits from the master cylinder (1) to the wheel brakes (36 and 39, 36' to 39') are pressure-controlled multidirectional valves (15, 15', 16, 16') which, in their initial position, provide for hydraulic communication between the master cylinder (1) and the wheel brakes. After a second switch position has been assumed, the auxiliary-pressure source (11, 12) will be connected to the wheel brakes (36 to 39, 36' to 39'), whereby dynamic braking is effected instead of the master cylinder (1).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.