JPH0226967U

JPH0226967U -

Info

Publication number: JPH0226967U
Application number: JP10550888U
Authority: JP
Priority date: 1988-08-10
Filing date: 1988-08-10
Publication date: 1990-02-21

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す概略構成図、
第２図は第１図に示した制御弁の拡大断面図であ
る。符号の説明、１１……マスタシリンダ、１２ａ
……ホイールシリンダ、１３ａ……車輪、２０…
…コントロールユニツト、２１ａ……給排切換弁
、２２……リザーバ、２３……液圧ポンプ、２６
，２７……チエツク弁、３１……ボデイ、３１ａ
……第１ポート、３１ｂ……第２ポート、３１ｃ
……第３ポート、３１ｅ……シート、３１ｅ１…
…切欠、３２……ピストン、３３……弁体、３４
……スプリング、４１，４３，４４……管路（供
給路）、４８……管路（還流路）、Ｖ１……制御
弁。 FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is an enlarged sectional view of the control valve shown in FIG. 1. Explanation of symbols, 11...Master cylinder, 12a
...Wheel cylinder, 13a...Wheel, 20...
...control unit, 21a...supply/exhaust switching valve, 22...reservoir, 23...hydraulic pump, 26
, 27...Check valve, 31...Body, 31a
...First port, 31b...Second port, 31c
...Third port, 31e... Seat, 31e1...
... Notch, 32 ... Piston, 33 ... Valve body, 34
...Spring, 41, 43, 44... Pipe line (supply line), 48... Pipe line (reflux line), V1... Control valve.

Claims

[Scope of utility model registration request]

When the brake fluid pressure circuit connecting the master cylinder and the wheel cylinder is switched in response to a signal from the control unit that detects the skid state of the wheel, the wheel cylinder is connected to the reservoir or the master cylinder. A supply/discharge switching valve is provided which controls the hydraulic pressure applied to the cylinder, and communicates the master cylinder and the wheel cylinder when not in operation, and cuts off communication between the wheel cylinder and the reservoir, and also controls the hydraulic pressure from the control unit. For anti-skid, the discharge port of a hydraulic pump that operates in response to a signal to suck in and discharge hydraulic fluid in the reservoir is connected to a supply path connecting the master cylinder and the supply/discharge switching valve through a reflux path. In the hydraulic pressure control device, a check valve that allows flow toward the supply path and prevents reverse flow is interposed in the return path, and a control valve is provided in the passage connecting the supply/discharge switching valve and the wheel cylinder. The control valve is provided with a first port connected to the supply/discharge switching valve, a second port connected to the hydraulic pump side of the check valve of the recirculation path, and a seat at the inner end thereof. a body having a third port connected to the wheel cylinder; and a first liquid chamber assembled within the body so as to be movable forward and backward relative to the seat by a predetermined amount, with the seat and the first port opening on the seat side. a piston that forms a second liquid chamber in the back of which the second port opens; and a piston that is provided on the seat side of the piston and is seated on the seat when the piston moves forward to the seat. The control valve is configured to include a valve body that forms a restriction between the first port and the third port, and a spring that biases the valve body and the piston toward the second liquid chamber, and the piston is attached to the control valve. 1. A hydraulic pressure control device for anti-skid, characterized in that a second check valve is provided which allows flow from the third port side to the first port side and prevents reverse flow when the hydraulic pressure control device is in the forward movement position.