Nissan Motor Company Limited

Rhythm Motor Parts Mfg., Co., Ltd.

Rhythm Motor Parts Manufacturing Company Limited

Shinkichi Kadota

Tsuyoshi Yamase

Hydraulic pressure control valve for automobile brake mechanism

A free piston is reciprocally disposed within a first plunger unit associated with one of two circuits which plunger also houses a poppet valve actuatable by the free piston. A second plunger is reciprocally received in one end of the first plunger unit and also has a poppet valve actuatable by the free piston. The second plunger is biased toward the first by an actuator piston/spring arrangement subject to control by a valve responsive to vehicular deceleration. During pressure modulation the free piston reciprocates back and forth rapidly, opening and closing each of the poppet valves. Upon failure of one of the dual circuits both of the plungers shift in the same direction causing one poppet valve to remain open and prevent pressure modulation. Upon failure of the other circuit, the pressure transmitted by the arrangement markedly increases to produce the necessary deceleration to close a deceleration sensitive valve and induce modulation. Further, the lack of bias on one end of the free piston elevates the modulation point at which the other poppet valve begins modulation whereby an adequately high pressure is discharged.

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Hamamatsu, Japan

Shinkichi Kadota