Robert Boschgmbh

Ewald Huebl

Heinz Siegel

Klaus Mueller

Edgar Schmitt

Roland Benzinger

Martin Jordan

Manfred Himmelsbach

Walter Steinhauser

Erhard Ellendt

Rolf Igelmann

A brake booster for a pressure-fluid-actuated, and in particular hydraulic, brake system equipped with both ABS and traction control has a servo piston that is controllable by a brake pedal, and an additional piston that is controllable via a magnetic valve assembly in traction control operation; to control a brake pressure in the brake system, both pistons act via a pressure rod upon the brake piston of a master brake cylinder. For the sake of a short structural length of the brake booster, the additional piston is embodied as an annular piston, which coaxially surrounds the pressure rod and is sealed off from it, and which rests on a radially protruding driver element of the pressure rod in order to displace it.

Brake booster

A brake system with traction control, having a master brake cylinder for at least one brake circuit and having a brake booster is proposed. By operation of a pump, servo pressure is fed into the brake booster via a pressure connection provided on the brake booster, and the servo pressure reaches a pressure reservoir through a bore provided on the brake booster. From there, given a corresponding open passage position of magnetic valves, the servo pressure, via a supply line, reaches the pressure cylinder present in the brake booster, and in the pressure cylinder there is a valve slide that, via a servo piston, actuates a pressure rod leading to the master brake cylinder.

Brake system

A brake system including an apparatus for limiting drive slip at drivable vehicle wheels by feeding brake pressure into wheel brakes associated with these vehicle wheels. The brake pressure is generated in a pressure modulator having a spring-loaded stepped piston including a primary piston. The primary piston can be acted upon by pressure fuid from a supply container by a motor which drives a pump. A secondary piston of the stepped piston effects the brake pressure and feeds it via a valve assembly into a brake line extending between the master brake cylinder of the brake system and a wheel brake. The brake pressure can be diminished by controlling the drive motor of the pump. The pump is embodied with reversible pumping directions, and the pressure fluid flows through it both during a working stroke and a return stroke of the stepped piston. The valve assembly is actuatable by the stepped piston as a function of the position thereof. The apparatus uses the pump drive alone in order to generate brake pressure, and uses the position of the stepped piston to actuate the valve assembly. This makes it possible to dispense with magnetic valves.

Hydraulic brake system with reversible pump for traction control

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Schwieberdingen, Germany

Ewald Huebl