Patent · US Expired

Brake system with hydraulic brake force boosting and pedal travel simulator

US4730877A · kind A · utility

41Cited by

11References

6Claims

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	Jul 10, 1986
Grant date	Mar 15, 1988
Priority date	—
Expiry date	Jul 10, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60T17/02
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A brake system with hydraulic force boosting comprises a master cylinder (1) and an auxiliary pressure supply system including a hydraulic pump (10), the driving motor (M) of which is actuated when the brake is applied. The pressure in the working chambers (18,19) of the master cylinder (1) results in the re-switching of valve arrangements (2,3) with the result that the controlled auxiliary pressure is applied to the wheel brakes (4-7) in lieu of the master cylinder pressure (1). For pedal travel simulation, a hydraulic cylinder (37) is connected to a work chamber (19), with the piston (38) of the hydraulic cylinder being displaceable against a restoring spring (39) and against the controlled auxiliary pressure. A pressure-controlled multidirectional valve (40) provides for a connection of the auxiliary pressure source.

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