Daimler-benz Ag

Daimler Chrysler Ag

Mercedes-benz Aktiengesellschaft

Emil Naumann

Nikolaus Schefcsik

Erich Beck

Hans-Georg Riedel

Manfred Minning

Herbert Klemmer

Ernst Senft

Ullrich Uhl

Joseph Wese

A brake unit has a brake application device, a brake disc with a friction surface and a brake shoe with a friction lining which, during the actuation of the brake unit, acts by an application force Fs of the brake shoe on the friction surface of the brake disc. The friction surface of the brake disc is formed from a ceramic/metal composite material. A control device controls the application force Fs of the brake shoe during a braking procedure such that a defined braking torque results as a function of the application force. The brake shoe application force is increased by an increase in pressure such that an essentially linearly varying braking torque results. The invention also relates to a brake unit for carrying out this method by use of an electrohydraulic control device.

Method and apparatus for producing linear braking torque

In disc brakes, disturbing noises, such as whistling or squealing, occurring during braking operations can be prevented if the brake shoe, to be pressed against a brake disc by a pressure member, for example a hydraulically actuated piston, is taken along in the circumferential direction of the latter as soon as the brake shoe comes into contact with the brake disc, and is laid against bearing faces of a brake anchor plate. Accordingly, the pressure member is provided, on its end face facing the brake shoe, a pressing element which projects beyond the end face, is transversely movable to a limited extent and returns automatically to its initial position again, and which is arranged in the pressure member so as to be axially displaceable counter to a return force which, in the event of mutual contact between the pressing element and brake shoe, is lower than the pressing force of the pressure member.

Disc brake with ring-shaped pressing element

An adjusting device is disclosed for the brake shoes of inside shoe brakes. The adjusting device includes two levers which are articulated on a carrier at a lateral distance from one another. The levers each engage on one of two adjacent brake shoe ends and are jointly in engagement with a frustoconical endpiece of an actuating member guided rotatably on the carrier in a threaded bore provided between the levers and extending in parallel with a brake drum axis. During the rotation of the actuating member for the adjustment of the brake shoes, the two levers are pivoted in directions opposite to one another, being supported respectively on one of two mutually opposite edges of the brake-shoe webs so as to surround these. The adjusting device is merely attached by its levers on to the brake shoe webs so it can also execute self-reinforcing floating movements of the brake shoes in dual servo-brakes.

Adjusting device for the brake shoes of inside shoe brakes

An adjusting device for automatically compensating for cable strand elongation in a vehicle parking brake utilizes a rotatable disc cam having a circumferential edge which spirals radially out to effect a displacement of a cable yoke in a cable tensioning direction as slack develops in a cable strand of the parking brake. The disc cam is tensioned by a torsion spring, the entire device having a small number of parts and high operational reliability even when dirty.

Adjusting device for a vehicle parking brake

Growing community of inventors

Reichenbach, Germany

Emil Naumann