Hydraulic brake system

US4754605A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventors

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

Key dates

• Filing date: Mar 12, 1986
• Grant date: Jul 5, 1988
• Expiry date: Mar 12, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/446
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hydraulic brake system comprising a pedal-operated brake booster (5), which is connected with the master cylinder (3) and includes an auxiliary pressure supply system (13), a booster piston (4), and a booster chamber (7) wherein an auxiliary pressure is established which is proportional to the foot pressure (F). The hydraulic brake system is provided with wheel brakes (14,15,16,17) connected to the master cylinder (3), a filling stage cylinder (18) is provided which displaceably houses a two-stage piston (20). A pressure chamber (21) is arranged in front of the large stage (83) of the two-stage piston (20) and a filling chamber (22) is arranged in front of the small stage (84) of the two-stage piston (20). In this arrangement, the filling chamber (22) communicates with one of the working chambers (26) of the master cylinder (3) and/or a brake line (28) by way of a pressure line (25). The booster piston (4) plunges into an annular chamber ( 65) arranged between the master cylinder (3) and the brake booster (5). The annular chamber (65) communicates with the pressure chamber( 21) of the filling stage cylinder (18), on the one hand, and with the supply reservoir (55), on the other h…