US 2011/0079472 A1Published application

Brake Actuating Device of a Vehicle

AssigneeBayerische Motoren Werke Aktiengesellschaft

InventorRoland Schmidt

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Abstract

A brake actuating device has an actuator functionally connected between a piston and a brake pedal lever. The actuator is capable of varying the path length of a force-conducting connection between the brake pedal lever and the piston of the brake cylinder via a displaceable element. A spring element acts on the brake pedal lever. The spring force varies during the variation of the path length such that a sum of the spring force and a force acting on the brake pedal lever from the brake cylinder remains essentially unchanged. The spring element is fastened with one end to the displaceable element and with the other end to the brake pedal lever with the interposition of a tensioning mechanism, which is guided by a cam track provided on the brake pedal lever. The cam track and the spring element are designed such that a displacement of the displaceable element into any possible position of the brake pedal lever does not generate a change in the pedal force at the brake pedal lever that is perceptible to the driver.

Claims8

Dependent claims

A brake actuating device for a vehicle, comprising:

a brake pedal lever operable by a driver and connectable in a force-conducting manner to a brake cylinder to actuate a piston arranged in the brake cylinder;
an actuator functionally coupleable between the piston and the brake pedal lever;
a displaceable element being displaceable by the actuator to vary a path length of the force-conducting connection between the brake pedal lever and the piston;
a spring element having a spring force that acts on the brake pedal lever, the spring force varying as a function of a variation of the path length of the force-conducting connection between the brake pedal lever and the piston such that a sum of the spring force and a brake cylinder force acting on the brake pedal lever remains essentially unchanged;
a tensioning mechanism;
a cam track provided on the brake pedal lever;
wherein one end of the spring element is connected to the displaceable element and the other end is connected to the brake pedal lever via the tensioning mechanism;
wherein the cam track is pivotable together with the brake pedal lever, the cam track and the spring element being operatively configured such that displacement of the displaceable element by way of the actuator for shortening the path length of the force-conducting connection does not generate a driver perceptible change in pedal force at the brake pedal lever.

5 more elements

Dependencies are inferred from the claim text.