Abstract: An anti-lock brake system includes a wheel cylinder, a master cylinder for supplying brake pressure to the wheel cylinder, a modulator having a fluid intake passage communicating with the master cylinder and a fluid exhaust passage communicating with the wheel cylinder, and a solenoid valve mounted within the modulator to control hydraulic pressure supplied from the master cylinder to the wheel cylinder.

Abstract: A solenoid valve for an anti-lock brake system is disclosed in which two orifices and oil passages are formed utilizing a valve seat and a piston. The solenoid valve includes a magnetic core (130) mounted in a bore (101) formed on a modulator (100), a plunger (140) movably mounted in the magnetic core (130), a valve seat (150) disposed below the magnetic core (130) in the bore (101), and a piston (200) movably mounted at the periphery of the valve seat (150). The valve seat (150) has an invariable orifice (320) formed at the inner middle portion of the valve seat, an inlet and outlet passages (300) and (310) formed below and above the invariable orifice (320), respectively. The piston (200) has a variable orifice (340) formed passing through one side of the upper portion of the piston. A lip seal (400) is provided between the outer periphery of the piston (200).

Abstract: A solenoid valve for an anti-lock brake system is disclosed which has two orifices and oil passages formed a magnetic core so that at the slip mode the amount of hydraulic oil transmitted to a wheel sylinder can be varied, its structure is simplified and its manufacture is facilitated. The solenoid valve includes a magnetic core 130 inserted into a bore 101 in a modulator 100 which has an inlet and outlet passages 300 and 310 and an invariable orifice 320, a plunger 140 installed in the magnetic core 130, and a piston 200A installed in the inlet passage 300. The piston 200A has an eccentric hole 202 formed vertically passing through its interior and a groove 203 on its top surface, thus forming a variable orifice 340 along with a lower end of the invariable orifice 320. The magnetic core 130 has a through hole 330 formed slanting upward. A lip seal 400 is formed between the outer periphery of the magnetic core 130 and the bore 101.

Abstract: There is disclosed a solenoid-supporting device for an antilock brake system by which the vibration and noise created from solenoid valves are attenuated and the heat generated from the solenoid valves are effectively radiated. The solenoid-supporting device comprises: a base plate contacting the bottom surface of a modulator block; a plurality of penetration holes formed at the base plate in order that valve bodies pass through the penetration holes and are combined with solenoids; and a plurality of elastic members which are made by extending from the base plate around the respective penetration holes in order to urge the solenoids to the ECU housing.