Nissin Kogyo Co., Ltd.

Joichi Nakano

Isao Matsuno

Yoshinobu Mizusaki

In a proportional booster valve V, a primary reaction piston and a secondary reaction piston are provided between a control piston which faces at one end thereof toward a control pressure chamber into which hydraulic pressure outputted from a primary master cylinder is inputted a boost pressure chambers connected to secondary master cylinders, the primary reaction piston being adapted to transmit at all times to the control piston a reaction force corresponding to hydraulic pressure of the boost pressure chamber the secondary reaction piston being adapted to transmit to the control piston a reaction force corresponding to the hydraulic pressure of the boost pressure chamber as the hydraulic pressure of the boost pressure chamber exceeds a set hydraulic pressure.

Hydraulic brake booster

A hydraulic brake booster includes a primary master cylinder M , a hydraulic power source , a fluid tank and proportional booster valves Vf, Vr for boosting an output hydraulic pressure from the primary master cylinder M proportionally so as to supply the hydraulic pressure so boosted to wheel brakes Bfa, Bfb, Bra, Brb, the proportional booster valves being constructed as a spool type proportional booster valve.

Growing community of inventors

Nagano, Japan

Joichi Nakano