JPH0170670U

JPH0170670U -

Info

Publication number: JPH0170670U
Application number: JP1987167608U
Authority: JP
Priority date: 1987-10-30
Filing date: 1987-10-30
Publication date: 1989-05-11

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例である液圧ブレーキ
装置の系統図である。第２図はその液圧ブレーキ
装置により制御されるマスタシリンダ液圧とリヤ
ブレーキシリンダ液圧との関係を示すグラフであ
る。第３図は従来の液圧ブレーキ装置の系統図で
ある。１０：ブレーキペダル、１１：液圧ブースタ、
１２：マスタシリンダ、２６：左後輪、２８：右
後輪、３０，３２：リヤホイールシリンダ、３４
：パワー圧室、３６：アキユムレータ、３８：リ
ザーバ、４６：プロポーシヨンバルブ、４８：ア
ンチスキツド装置、５２：バルブ本体、６４：バ
ルブピストン、７６：第一液圧室、８２：第二液
圧室、８４：第一受圧面、８６：第二受圧面、９
８：開閉弁、１１０：制御ピストン、１１６：制
御液圧室、１２２：スプリング、１２８：電磁方
向切換弁、１３２：制御回路、１３４：回転セン
サ。 FIG. 1 is a system diagram of a hydraulic brake device which is an embodiment of the present invention. FIG. 2 is a graph showing the relationship between the master cylinder hydraulic pressure and the rear brake cylinder hydraulic pressure controlled by the hydraulic brake device. FIG. 3 is a system diagram of a conventional hydraulic brake device. 10: Brake pedal, 11: Hydraulic pressure booster,
12: Master cylinder, 26: Left rear wheel, 28: Right rear wheel, 30, 32: Rear wheel cylinder, 34
: Power pressure chamber, 36: Accumulator, 38: Reservoir, 46: Proportion valve, 48: Anti-skid device, 52: Valve body, 64: Valve piston, 76: First hydraulic pressure chamber, 82: Second hydraulic pressure chamber, 84: First pressure receiving surface, 86: Second pressure receiving surface, 9
8: Open/close valve, 110: Control piston, 116: Control hydraulic chamber, 122: Spring, 128: Electromagnetic directional control valve, 132: Control circuit, 134: Rotation sensor.

Claims

[Claims for Utility Model Registration] (a) A hydraulic booster that has a power piston operated by the power pressure of a power pressure chamber and that doubles the operating force applied to the brake operating member and transmits it to the master cylinder. (b) is slidably disposed within the valve body, receives the hydraulic pressure of the master cylinder on a first pressure receiving surface, and receives the brake cylinder of the rear wheel on a second pressure receiving surface having a larger area than the first pressure receiving surface. a valve piston that receives hydraulic pressure; an on-off valve that allows or blocks the flow of brake fluid from the master cylinder to the brake cylinder based on the movement of the valve piston; and an on-off valve that is provided closer to the master cylinder than the on-off valve. , a first hydraulic pressure chamber that applies the hydraulic pressure of the master cylinder to the first pressure receiving surface; and a first hydraulic chamber that is provided closer to the rear wheel than the on-off valve and that applies the hydraulic pressure of the brake cylinder to the second pressure receiving surface. a second hydraulic chamber;
a proportioning valve having a biasing means for biasing the valve piston in a direction in which the opening/closing valve opens, and reducing the pressure of brake fluid supplied from the master cylinder at a constant ratio and supplying the brake fluid to the brake cylinder; (c) a control piston that is slidably disposed within the cylinder, operates in response to hydraulic pressure in a control hydraulic pressure chamber, and applies a control force to the valve piston in a direction opposite to the biasing force of the biasing means; a switching valve that is provided between the control hydraulic pressure chamber, the hydraulic pressure source, and the reservoir and selectively communicates the control hydraulic pressure chamber with the hydraulic pressure source and the reservoir; In the hydraulic brake system, the switching valve is connected to a power pressure chamber of the hydraulic pressure booster, and the power pressure chamber is connected to the hydraulic pressure source. A hydraulic brake device characterized by: