JPS6071738U

JPS6071738U - disc brake

Info

Publication number: JPS6071738U
Application number: JP16365083U
Authority: JP
Inventors: 志水　英敏; 堀江　光行
Original assignee: トヨタ自動車株式会社
Priority date: 1983-10-22
Filing date: 1983-10-22
Publication date: 1985-05-21

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来のディスクブレーキにおける液圧と入力に
対する制動トルクの比との関係をグラフにして示す図で
ある。第２図は本考案の一実施例であるディスクブレー
キを示す平面断面図である。第３図は第２図に示したデ
ィスクブレーキにおけるマスクシリンダ液圧と第一およ
び第二の液圧シリンダの液圧との関係をグラフにして示
す図であり、第４図は同ディスクブレーキにおけるマス
クシリンダ液圧と入力に対する制動トルクの比との関係
をグラフにして示す図である。第５図は゛本考案の別の
実施例であるディスクブレーキの減圧弁を示す平面断面
図であり、第６図は第５図に示す減圧弁を備えたディス
クブレーキにおけるマスクシリンダ液性と第一および第
二の液圧シリンダの液圧との関係をグラフにして示す図
である。１０：ディスクロータ、１２：トルク受は部材、１４：
インナパッド、１６：アウタパッド、１８．２０：摩擦
材、２２，２４：裏板、５０：ピストン（第一ピストン
）、５２：ピストン（第二ピストン）、５４：第一液圧
シリンダ、５６：第二液圧シリンダ、６４：第一摩擦材
、６６：第二摩擦材、７２，１１０：減圧弁、８２，１
１４：ハウジング、８４，１１２：バルブピストン、９
２：開閉弁、９４ニスプリング。FIG. 1 is a graph showing the relationship between hydraulic pressure and the ratio of braking torque to input in a conventional disc brake. FIG. 2 is a plan sectional view showing a disc brake which is an embodiment of the present invention. FIG. 3 is a graph showing the relationship between the mask cylinder hydraulic pressure and the hydraulic pressure of the first and second hydraulic cylinders in the disc brake shown in FIG. 2, and FIG. FIG. 7 is a graph showing the relationship between mask cylinder hydraulic pressure and the ratio of braking torque to input. FIG. 5 is a plan sectional view showing a pressure reducing valve for a disc brake which is another embodiment of the present invention, and FIG. It is a graph showing the relationship between the pressure and the hydraulic pressure of the second hydraulic cylinder. 10: Disc rotor, 12: Torque receiver is a member, 14:
Inner pad, 16: Outer pad, 18.20: Friction material, 22, 24: Back plate, 50: Piston (first piston), 52: Piston (second piston), 54: First hydraulic cylinder, 56: First Two hydraulic cylinders, 64: first friction material, 66: second friction material, 72, 110: pressure reducing valve, 82, 1
14: Housing, 84, 112: Valve piston, 9
2: Open/close valve, 94 spring.

Claims

[Scope of Claim for Utility Model Registration] A brake pad having a rotating disc rotor having a friction surface, a friction material facing the friction surface of the disc rotor, and a back plate fixed to the back side of the friction material, and the brake pad. Two torque receivers are installed in parallel on one side of the disc rotor and are movable in a direction perpendicular to the friction surface of the disc rotor. Each torque receiver is actuated by hydraulic pressure and acts on the back plate of the brake pad, thereby increasing the brake force. A disc brake comprising a first hydraulic cylinder and a second hydraulic cylinder each having a first piston and a second piston that press a pad against a friction surface of a disc rotor, wherein the first piston of the brake pad causes the first piston of the disc rotor to press the disc rotor. The friction coefficient of the friction material on the side pressed against the friction surface is lower than the friction coefficient of the friction material on the side pressed by the second piston, and at least a liquid A disc brake characterized in that a pressure reducing valve is provided for reducing the hydraulic pressure supplied to the first hydraulic cylinder and supplying the reduced hydraulic pressure to the second hydraulic cylinder while the pressure is lower than a certain value.