US 8,448,757 B2Granted

Electromechanical friction brake

AssigneeRobert Bosch GmbH

InventorsHerbert Vollert, Chi-Thuan Cao, Bertram Foitzik, Willi Nagel, Bernd Goetzelmann, Dirk Hofmann

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Abstract

The invention relates to an electromechanical friction brake, for example in the form of a disc brake having an electromechanical actuation device. The electric motor of the actuation device presses a frictional brake lining against a brake disc by means of a reduction gearbox and a ball ramp mechanism. The actuation device is supported by a spring washer that is pretensioned so strongly that when the disc brake is released it acts on a segment with a falling spring characteristic; that is, a spring force exerted by the spring washer on the frictional brake lining increases with increasing tension of the disc brake.

Claims18

Dependent claims

An electromechanical friction brake, comprising:

an electromechanical actuating device;
a friction brake lining configured to be pressed by the actuating device against a brake body to be braked so as to actuate the friction brake;
and
a first spring element configured to exert a force parallel to the actuating device to urge the friction brake lining in a direction of a brake actuation,
wherein the first spring element is further configured such that the force exerted by the first spring element increases as the friction brake lining moves in the direction of the brake actuation, and
wherein the actuating device has an electric motor and a ramp mechanism, the ramp mechanism being configured to convert a rotational drive motion of the electric motor into a translational motion for pressing the friction brake lining against the brake body.

3 more elements

Dependencies are inferred from the claim text.