2-POSITION 3-WAY SOLENOID VALVE, MODULATOR AND ANTI-LOCK BRAKE SYSTEM WITH THE VALVE

摘要

A 2-position 3-way solenoid valve having first, second and third ports and first and second chambers. The first chamber is communicated with the first port and the second chamber is communicated with the second and third ports. The chambers are partitioned by a barrier wall and are communicated with each other by an opening formed to the barrier wall. In response to a valveactuated signal, a spool is moved in lengthwise direction, so that the opening and the third port are opened alternatively. When the third port is closed, the hydraulic pressure generated from a hydraulic pump is supplied to a brake wheel cylinder through the first and second ports to increase braking pressure. When the opening is closed, the hydraulic pressure within the brake wheel cylinder is decreased through the second and third ports to decrease braking pressure.