Patent ID: 8579385
Filing Date: 2013-11-12
Classification: B60T

Abstract:
1. A brake system for a vehicle, comprising: a master cylinder; at least one brake circuit; at least one wheel brake; and a fluid control unit configured to modulate brake pressure at the at least one wheel brake and including a switchover valve, an intake valve, a recirculating pump, and a slide valve for each brake circuit in the at least one brake circuit, wherein the slide valve, is positioned in a suction line between the recirculating pump and the master cylinder, wherein the slide valve limits an effective pressure on a suction side of the recirculating pump to a predeterminable maximum pressure value, wherein the slide valve includes (i) a master cylinder connection, (ii) a pump connection, (iii) a pressure relieved connection, (iv) a longitudinally movable stepped piston defining a piston bore, (v) an adjusting spring, and (vi) a housing defining a sealing seat, wherein the stepped piston is subjected to a spring force from the adjusting spring that urges the stepped piston into an outset position in which a fluid communication between the master cylinder connection and the pump connection, via the piston bore, is completely open, wherein the stepped piston includes (i) a first region toward the pressure relieved connection that has a first diameter, (ii) a second region toward the pump connection that has a second diameter, which is greater than the first diameter, and (iii) a transition region interposed between the first region and the second region that has a frustoconical shape defining a sealing cone, and wherein the sealing cone fits complementarily into the sealing seat to enable the sealing cone to seal against the sealing seat.