US 4,750,790 AGranted

Anti-lock hydraulic brake system for vehicles with bypass line and relieving device

AssigneeAlfred Teves GmbH

InventorHans-Christof Klein

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Abstract

An anti-lock hydraulic brake system for vehicles incorporating a master cylinder (21) and wheel brakes, (30, 31) connected to the master cylinder (21) through connecting lines (32, 34), as well as an anti-lock apparatus having sensors for the associated wheel brakes (30, 31) by which, in the event of excessive deceleration of a vehicle wheel, the wheel brake will be disconnected from the master cylinder (21) by a valve (11) and will be connected to a relieving device. The relieving device is composed of a slave cylinder (1), whose piston (2) is in operative engagement with a movable wall of an actuating device operating with vacuum, which movable wall is displaceable to assume a control position in opposition to the force of a resilient element, for example a steel spring, the piston chamber (44) in front of the piston (2) being connected via a by-pass line (35) which contains a valve (23) with the brake line (32, 34) communicating with the intermdeiate chamber (45) of a separating valve ( 11). The valve member (12) of the separating valve (11) is actuatable by the piston (2), while the pressure in the cylinder chamber of the vacuum cylinder housing is variable through a valve so that the movable wall is movable to and fro together with the piston (2).

Claims6

Dependent claims

An anti-lock hydraulic brake system for an automotive vehicle having vehicle wheels and wheel brakes, said system comprising, in combination:

a master cylinder having a working chamber connected to said wheel brakes;
a pressure relieving device including a vacuum cylinder and an adjacent slave cylinder, said cylinders operatively coupled together by a piston rod extending between said cylinders;
said slave cylinder including a piston chamber for receiving a piston connected to said piston rod, said slave cylinder including an inlet chamber connected to said working chamber, and said slave cylinder including an intermediate chamber located between said piston chamber and inlet chamber and being connected to said wheel brakes;
a by-pass line connected between said piston chamber and intermediate chamber, said by-pass line having a one-way valve connected therein permitting fluid flow from said intermediate chamber to said piston chamber;
a normally closed valve connected across said one-way valve to by-pass said one-way valve when said normally closed valve is actuated into its open position;
and,
a separating valve including a valve seat and a valve member, said separating valve connecting said inlet and intermediate chambers of said slave cylinder when said piston is translated toward said valve member and closing the connection between said inlet and intermediate chambers when said piston is translated away from said valve member.

4 more elements

Dependencies are inferred from the claim text.