JPS59172840U

JPS59172840U - Drum brake operating gap automatic adjustment device

Info

Publication number: JPS59172840U
Application number: JP6811383U
Authority: JP
Inventors: 公廣鈴木
Original assignee: 豊生ブレ−キ工業株式会社
Priority date: 1983-05-07
Filing date: 1983-05-07
Publication date: 1984-11-19

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図は本考案の一実施例が適用されたドラムブレーキ
の正面図である。第２図及び第３図はそれぞれ第１図の
実施例の要部拡大図である。第４図乃至第７図はそれぞ
れ本考案の他の実施例を示す図である。１０：バッキングプレート、１２．１４：ホイールシリ
ンダ、１６．１８ニブレーキシユー、２４：回転ドラム
、２６：内周面、４０．　４２：リターンスプリング、
４４．　４５．　７０．　８２：掛止部材（第２係合部
材）、４６．４７．７２．８３：調節部材（第１係合部
材）、４８．　８０．　８４：掛止歯（第２の係合歯Ｌ
５２：調節歯（第１の係合歯）　、５６，７４：ねじり
コイルスプリング（スプリング）、８６：掛止部材（第
２保合部材、スプリング）。 −１０１？１ □二第５図６７Ｂ４）６FIG. 1 is a front view of a drum brake to which an embodiment of the present invention is applied. 2 and 3 are enlarged views of essential parts of the embodiment shown in FIG. 1, respectively. FIGS. 4 to 7 are diagrams showing other embodiments of the present invention, respectively. 10: Backing plate, 12.14: Wheel cylinder, 16.18 Brake shoe, 24: Rotating drum, 26: Inner peripheral surface, 40. 42: Return spring,
44. 45. 70. 82: Latching member (second engagement member), 46.47.72.83: Adjustment member (first engagement member), 48. 80. 84: Latch tooth (second engaging tooth L
52: Adjustment tooth (first engagement tooth), 56, 74: Torsion coil spring (spring), 86: Latching member (second retaining member, spring). -101? 1 □2 Figure 5 67B 4)6

Claims

[Claims for Utility Model Registration] A brake shoe attached to a backing plate, a wheel cylinder that abuts one end of the brake shoe and presses the brake shoe against the inner peripheral surface of a rotating drum, and a wheel cylinder that presses the brake shoe against the inner peripheral surface of a rotating drum; In a drum brake equipped with a return spring biased in a direction away from an inner circumferential surface, an automatic operating gap adjustment device that automatically adjusts an operating gap between the brake shoe and the inner circumferential surface, comprising: 1st
a first retaining member and a second retaining tooth attached to one and the other of the brake shoe and backing plate, respectively, and the retaining teeth are capable of engaging and disengaging. a spring that urges the first and second engagement members in a direction toward each other to engage the first and second engagement teeth; , and the shapes of the first engaging tooth and the second engaging tooth allow movement in a direction approaching the inner circumferential surface of the brake shoe, and the amount of movement of the brake shoe is within a certain dimension A. In the following cases, the brake shoe is prevented from moving in the opposite direction at the original locking position, and if the amount of movement exceeds the fixed dimension A, the brake shoe is stopped at the new locking position shifted by one pitch. An automatic operating gap adjustment device for a drum brake, characterized in that it is formed to prevent movement in the opposite direction beyond a certain dimension B, which is shorter than dimension A.