US 2016/0101767 A1Published application

Electrohydraulic Servo Brake

AssigneeRobert Bosch GmbH

InventorsCarole Charpentier, Antony Auguste, Bastien Cagnac

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Abstract

An electrohydraulic servo brake includes a master brake cylinder, which is controlled by a push rod. The push rod is configured to be actuated by a first auxiliary piston via a reaction disk. A plunger piston presses on the reaction disk. An end of the push rod is connected to the first auxiliary piston by a connection apparatus. The connection apparatus includes a rest for a rated compression spring, which rest is rigidly connected to the push rod, and a central piston, which rests against the reaction disk along an axis and is surrounded by a second auxiliary piston, which is placed against the reaction disk and is moved by the spring and is held in an end position by the central piston. The second auxiliary piston is configured to recede in relation to the central piston rigidly connected to the push rod.

Claims5

Dependent claims

An electrohydraulic servo brake comprising:

a first auxiliary piston;
an electric motor configured to drive the first auxiliary piston;
a reaction disc;
a push rod including an end portion connected to the first auxiliary piston by a connection apparatus including (i) a support securely connected to the push rod for a tared pressure spring, (ii) a central piston in abutment in accordance with an axis against the reaction disc and securely connected to the push rod, and (iii) a second auxiliary piston configured to surround the central piston by being placed against the reaction disc in a state pushed by the tared pressure spring and retained in an end position by the central piston, and the second auxiliary piston configured to move backward with respect to the central piston;
a main brake cylinder controlled by the push rod and configured to be actuated by the auxiliary piston via the reaction disc;
a control rod connected to a brake pedal;
a plunger piston configured to extend through the first auxiliary piston and to press on a portion of the reaction disc by being connected to the control rod;
and
a detector configured to detect movement of the control rod in order to actuate the electric motor.

6 more elements

Dependencies are inferred from the claim text.