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1. (WO2018099634) BRAKE MASTER CYLINDER, BRAKING SYSTEM

Pub. No.:    WO/2018/099634    International Application No.:    PCT/EP2017/075310
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Fri Oct 06 01:59:59 CEST 2017
IPC: B60T 11/236
F15B 15/14
F16J 15/3236
Applicants: ROBERT BOSCH GMBH
Inventors: HANSMANN, Simon
FOERCH, Dirk
KISTNER, Matthias
YVONET, Florent
SPROCQ, Raynald
ANDERSON, Chris
Title: BRAKE MASTER CYLINDER, BRAKING SYSTEM
Abstract:
The invention relates to a brake master cylinder (2) for a braking system (1) of a motor vehicle, comprising a hydraulic cylinder (4) having a plurality of hydraulic connections, in which cylinder at least one hydraulic piston (5, 6) is mounted such that the hydraulic piston can be displaced axially in an actuating direction and in a relief direction, wherein the hydraulic piston (5, 6) is displaceable in the actuating direction counter to the force of a spring element (7, 8), wherein the hydraulic piston (5, 6) has at least one lateral wall opening (30), which, in at least one sliding position, opens into an inner chamber of the hydraulic cylinder (4). According to the invention, the lateral wall opening (30) is assigned an elastically deformable sealing ring (32), which on the inside is fixed to the hydraulic piston (5) and on the outside is preloaded against the hydraulic cylinder (4) by the inherent elasticity of the sealing ring, and which is formed in such a way that, during a displacement of the hydraulic piston (5) in the actuating direction, the sealing ring is detached from the hydraulic cylinder (4) and, during a displacement of the hydraulic piston (5) in the relief direction, bears on the hydraulic cylinder (4).