Hydraulic pressure control device and vehicle brake device using the same

A hydraulic pressure control device comprising a housing formed with an input port, an output port and a discharge port, and a proportional pressure control valve and a hydraulic pressure generator mounted in said housing, said proportional pressure control valve having a spool valve and a return spring for biasing said spool valve, said spool valve bringing said output port into communication with said discharge port in a non-operated state, bearing hydraulic pressure on its opposed pressure-bearing surfaces having a difference in area, and moving to a balance point where the sum of the hydraulic pressure and the force of said return spring balances with an external force applied opposite thereto to change over connections of said output port to said input port and said discharge port, adjust the degree of opening of fluid passages, and adjust the hydraulic pressure at said output port to a value corresponding to the external force, said hydraulic pressure generator combined with said proportional pressure control valve, said hydraulic pressure generator comprising a first piston receiving brake pedal force as the external force, a second piston receiving the brake pedal force from said first piston through a first spring, and a fluid chamber formed between said first piston and said second piston, said hydraulic pressure generator discharging brake fluid through an output port,

• said hydraulic pressure control device further comprising a second spring abutting an end of said second piston opposite an end of said second piston abutting said first spring, said second spring converting movement of said second piston to a load and transmitting force to said spool valve, and said hydraulic pressure generator, said second spring and said proportional pressure control valve are arranged in series in this order.