Hydraulic brake system

US4703978A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventors

• Juan Belart · Walldorf, DE
• Wolfram Seibert · Darmstadt, DE
• Norbert Ocvirk · Offenbach, DE

Key dates

• Filing date: Jan 24, 1986
• Grant date: Nov 3, 1987
• Expiry date: Jan 24, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/565
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hydraulic brake system comprises a pedal-actuated tandem generator cylinder (3), an auxiliary-pressure supply system with electromotively driven pump (8) and pressure fluid supply reservoir (31) and an auxiliary-pressure control valve (7, 67). The tandem generator cylinder (3) is provided with a bore (24) extending wherethrough is an actuating rod (25, 72) which acts upon a primary piston (4, 68) and whose end remote from the primary piston (4, 68) cooperates with an initial-pressure piston (16) or a vacuum brake power booster (84) slidably supported in the bore (24) and being in turn coupled with the brake pedal (19) by way of a piston rod (17, 86). An annular piston (26) is displaceably arranged in the bore (24) between the primary piston (4, 68) and the initial-pressure piston (16) or, respectively, the force-output member (74) of the booster (84). The annular piston subdivides the space between the primary piston (4, 68) and the initial-pressure piston (16 ) or the force-output member (74) into two chambers (59 and 44), the one thereof communicating with a feed tank (6) of the tandem generator cylinder (3), while the other one is connected to the pressure-fluid supply reservo…