| 摘要 |
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. The solenoid valve includes a coil assembly disposed within a yoke to create an electromagnetic field using electric current applied, an armature disposed through a central axis of the yoke, the armature being slidable along the central axis by the electromagnetic field, a plunger coupled to the armature, a magnetic core provided with an invariable orifice opened and closed by the plunger to selectively communicate the fluid intake passage with the fluid exhaust passage, one end of the magnetic core being forcedly fitted in a bore of the modulator block, and a piston slidably disposed under the magnetic core to contact or move away from the invariable orifice formed in the magnetic core according to a brake mode, the piston being provided with a variable orifice which comes to communicate with the invariable orifice when the piston contacts the invariable orifice, a diameter of the variable orifice being smaller than that of the invariable orifice.
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