Patent ID: 9132815
Filing Date: 2015-09-15
Classification: B60T

Abstract:
1. A brake actuation unit for actuating a ‘brake-by-wire’ type brake system for a motor vehicle comprising: a brake booster operable via a brake pedal mounted on a shaft and via an electronic control unit depending on a request from a driver, with an element provided to decouple a force-transmitting connection between the brake pedal and the brake booster in the ‘brake-by-wire’ operating mode; a detector for detecting a deceleration request of the driver; a pedal travel simulator which interacts with the brake pedal and which allows a resetting force acting on the brake pedal to be simulated in the ‘brake-by-wire’ operating mode independently of the actuation of the brake booster, and which can be connected in the ‘brake-by-wire’ operating mode when the force-transmitting connection between the brake pedal and the brake booster is decoupled and can be disconnected outside the ‘brake-by-wire’ operating mode, with the pedal travel simulator being formed of at least one simulator spring, which is operatively arranged between a force-transmitting member connected to the brake pedal and a simulator housing which is mounted on the shaft by two bearings, wherein the simulator housing includes a cylindrical area for the accommodation of the two bearings, and wherein the force transmission between the brake pedal and the simulator spring is carried out by way of a friction member, the friction member compresses the simulator spring and at the same time the friction member slides along a friction surface arranged in the simulator housing, thereby generating a friction force which is additional to the simulator spring force in order to produce a hysteresis and in which one end of the simulator spring is mounted in the friction member.