Patent ID: 9133863
Filing Date: 2015-09-15
Classification: B60T,F15B

Abstract:
1. A hydraulic control device of an antilock brake system comprising: a body which includes an inlet port and an outlet port, and a cylinder of an internal space formed therein; a piston which is movably installed in the cylinder formed in the body so as to open and close a flow path between the inlet port and the outlet port; a stopper which is integrally fixed to one end of the piston to limit a moving range of the piston by a stopper moving space defined inside of the body; a spring which presses the stopper to apply a restoring force to the piston; and a control bolt which is installed in one end of the body to control the restoring force of the spring, wherein the piston includes an opening and closing ring for selectively preventing a flow of a fluid therethrough and a sealing ring for sealing the fluid, which are placed on an outer periphery thereof, the body includes an inlet flow path which has a cross section smaller than that of the cylinder and is formed on a piston head side of the other end portion of the piston to communicate with the inlet port, and a stepped piston seat is formed on an upper end of the cylinder, the cylinder includes a first gap communicated with the inlet flow path and a second gap communicated with the first gap and the outlet port, which are formed on an upper periphery thereof, the piston includes a piston head groove formed on the upper periphery thereof, and configured to allow the first gap to communicate with the inlet flow path, the piston head is seated on the piston seat under the condition that there is no fluid supplied through the inlet port or a fluid pressure applied thereto is lower than a restoring force of the spring, and when the opening and closing ring contacts with a limit projection formed in the body facing the piston between the first gap and the second gap, the flow of the fluid therebetween is prevented.