Pressure modulator for hydraulically operated vehicle brake systems - includes at least one relieving piston respectively working with shaft and electromagnetically controlled friction coupling

摘要

The relieving piston (3) reacts on two pressure chambers (1, 7) so that with the piston movement, one pressure chamber experiences a vol. increase and the other pressure chamber a redn. in vol. The relieving piston is held in its original position by a spring in the pressure chamber. If the electronic circuit identifies a risk of brake locking, the friction coupling (10) is electromagnetically excited, to produce a downward movement of the relieving piston, to increase the vol. in the pressure chamber (1). The pressure chamber (1) is used for ABS regulation and the other chamber (7) for ASR regulation. A changeover valve (4) is arranged between the pressure modulator and the wheel cylinder on one side and between the pressure modulator and the main cylinder (HZ) on the other side. The changeover valve is an electrically controlled 4/2 way valve. USE/ADVANTAGE - With simple and compact construction, can be used also for ASR as well as ABS systems or combination of both systems.