JPS63112962U

JPS63112962U -

Info

Publication number: JPS63112962U
Application number: JP540087U
Authority: JP
Priority date: 1987-01-16
Filing date: 1987-01-16
Publication date: 1988-07-20

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例である液圧制御装置
の正面断面図である。第２図は上記液圧制御装置
を備えた液圧ブレーキ装置を概略的に示す系統図
である。第３図は上記液圧制御装置の制御特性を
示すグラフである。１０：マスタシリンダ、３２：リヤブレーキシ
リンダ、３４：プロポーシヨニングバルブ（ＰＶ
）、３５：後輪荷重検知機構、３６：液圧制御シ
リンダ、３８：増圧器、５０：バルブピストン、
５２：弁子、５４：弁座部材、５６：開閉弁、５
８：圧縮コイルスプリング、６０：マスタシリン
ダ側液圧室、６２：リヤブレーキシリンダ側液圧
室、７２：棒ばね、８０：制御ピストン、８２：
制御液圧室、９０：増圧ピストン、９２：大径部
、９４：中径部、１０８：開閉弁、１１０：ボー
ル。 FIG. 1 is a front sectional view of a hydraulic pressure control device that is an embodiment of the present invention. FIG. 2 is a system diagram schematically showing a hydraulic brake device equipped with the above-mentioned hydraulic pressure control device. FIG. 3 is a graph showing the control characteristics of the hydraulic pressure control device. 10: Master cylinder, 32: Rear brake cylinder, 34: Proportioning valve (PV
), 35: Rear wheel load detection mechanism, 36: Hydraulic pressure control cylinder, 38: Pressure intensifier, 50: Valve piston,
52: Valve element, 54: Valve seat member, 56: Open/close valve, 5
8: Compression coil spring, 60: Master cylinder side hydraulic pressure chamber, 62: Rear brake cylinder side hydraulic pressure chamber, 72: Rod spring, 80: Control piston, 82:
Control hydraulic pressure chamber, 90: pressure increasing piston, 92: large diameter section, 94: medium diameter section, 108: opening/closing valve, 110: ball.

Claims

[Scope of Claim for Utility Model Registration] A proportioning valve that is installed in a fluid passage connecting a master cylinder and a rear brake cylinder of an automobile hydraulic brake system to reduce master cylinder fluid pressure and transmit it to the rear brake cylinder. , a rear wheel load detection device that has a load member that is displaced in accordance with changes in rear wheel load, detects the rear wheel load, and applies a biasing force corresponding to the load to the valve piston of the proportioning valve by the load member. In the brake fluid pressure control device for an automobile, the control piston is actuated by the fluid pressure of the proportioning valve to apply a force in a direction to block the fluid passage to the valve piston of the proportioning valve. a proportioning valve that starts operating after the piston starts depressurizing operation, and a pressure intensifier that increases the master cylinder hydraulic pressure and supplies it to the control hydraulic pressure chamber at a position opposite to the rear wheel load detection mechanism; and the product of the pressure increase rate of the pressure intensifier and the pressure receiving area of the control piston with respect to the control hydraulic pressure chamber is the master cylinder hydraulic pressure of the valve piston in the state where the liquid passage is blocked. Further, the pressure increasing piston of the pressure intensifier is provided with a communication passage passing through it in the axial direction and an on-off valve for opening and closing the communication passage, and a valve that passes through the valve piston and has one end. providing a rod whose other end abuts the valve element of the on-off valve and the other end abuts on the load member, and the rod normally opens the on-off valve to prevent the pressure booster from exerting a pressure increasing action; A brake fluid pressure control device for an automobile, characterized in that when the load member is separated from the valve piston, an on-off valve is allowed to close, thereby causing a pressure intensifier to perform a pressure increasing action.