SPEED REDUCTION SENSITIVE BRAKING LIQUID CONTROLLER FOR CAR

PURPOSE:To achieve optimal liquid pressure irrespectively of the stepping speed by placng a variable orifice to be enlarged in accordance to the flow speed of braking liquid at predetermined position in liquid pressure path thereby decreasing the restriction effect as the stepping speed of brake pedal increases. CONSTITUTION:It is comprised of P valve 34 having a differential piston 36 and a valve seat 38 to be arranged at the left of a stepped inner hole 12 of a housing 10, a control piston 50 arranged in a partition wall member 40 provided in the central portion of the inner hole 12 and a speed reduction sensitive valve 42 having an inertia ball 44 and a valve seat 46 to be arranged at the right of the inner hole 12. Here a variable orifice 84 is placed in a path 82 conducting between a liquid chamber 70 for containing the inertia ball 44 of said valve 42 and a liquid chamber 72 formed in said member 40 with said piston 50. Said variable orifice 84 is constructed of a tubular rubber resilient member and enlarged in accordance to the flow speed of braking liquid flowing from the liquid chamber 70 toward liquid chamber 72.