Patent ID: 6276764
Filing Date: 2001-08-21
Classification: B60T,F16K,Y10S

Abstract:
A solenoid valve for an anti-lock brake system having a modulator comprising:a magnetic core mounted in a bore formed on said modulator, with a plunger hole formed vertically passing through the interior of said magnetic core;a valve seat disposed below said magnetic core in said bore, with an invariable orifice formed at the inner middle portion of said valve seat, an inlet passage formed below said invariable orifice, and an outlet passage formed above said invariable orifice, wherein the lower end of said valve seat is fixed to the bottom surface of said bore, and in this state the upper end of said valve seat is spaced a given distance away from the lower end of said magnetic core to form an oil outlet therebetween;a plunger movably mounted in said plunger hole, with a ball formed at the lower end of said plunger for opening and closing the upper end of said invariable orifice;a piston movably mounted at the periphery of said valve seat, with a variable orifice formed passing through one side of the upper portion of said piston, wherein said piston comprises:a first projection formed at a middle portion of the periphery of said piston, the front end of which is disposed adjacent to the inner periphery of said bore; anda second projection formed at the lower end of said piston and disposed near the bottom of said bore, the length of said second projection being shorter than said first projection; anda lip seal provided between said first and second projections for preventing oil from flowing to said outlet passage through said piston.