JPS58182026U

JPS58182026U - Automatic adjustment device for hydraulically operated drum brakes

Info

Publication number: JPS58182026U
Application number: JP8005682U
Authority: JP
Inventors: 出沢　功; 福沢　源一郎
Original assignee: 日信工業株式会社
Priority date: 1982-05-31
Filing date: 1982-05-31
Publication date: 1983-12-05
Also published as: JPS6121622Y2

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例を示すドラムブレーキの要
部縦断全体正面図、第２図は第１図の■−■線拡線断大
断面図３図は本考案の第２実施例を示す、第２図と同様
の断面図である。Ａ・・・自動調整装置、２．２′・・・ホイールシリン
ダ、３．　３’・・・ブレーキシュー、４・・・シリン
ダ本、体（第１部材）、５・・・油圧室、６・・・ピス
トン（第２部材）、１０．１０’、・・・戻しばね、１
５・・・当接面、１６・・・調節ナツト、１７・・・ば
ね、１８・・・調節杆、１９・・・早ねじ、２０・・・
クラッチ体、２１・・・クラッチ孔、２２・・・クラッ
チ面、２３・・・シール部材、２４・・・自動調整解除
室。Fig. 1 is a front view of the main parts of a drum brake showing a first embodiment of the present invention, and Fig. 2 is an enlarged cross-sectional view taken along the line ■-■ in Fig. 1. Fig. 3 is a second embodiment of the present invention. FIG. 2 is a cross-sectional view similar to FIG. 2, showing an example; A...Automatic adjustment device, 2.2'...Wheel cylinder, 3. 3'... Brake shoe, 4... Cylinder body, body (first member), 5... Hydraulic chamber, 6... Piston (second member), 10.10',... Return spring ,1
5... Contact surface, 16... Adjustment nut, 17... Spring, 18... Adjustment rod, 19... Quick screw, 20...
Clutch body, 21...Clutch hole, 22...Clutch surface, 23...Seal member, 24...Automatic adjustment release chamber.

Claims

[Scope of utility model registration request]

First and second members defining a hydraulic chamber of a wheel cylinder are disposed so as to be non-rotatable and slidable relative to each other, and a brake shoe is actuated by a separating action of the two members due to the hydraulic pressure supplied to the hydraulic chamber. 2 automatic adjustment devices for a hydraulically operated drum brake, wherein the first and second
an adjustment nut that is non-rotatably supported by one of the members and is separably abutted against a contact surface provided on the one member; and the adjustment nut is biased toward the contact side with the contact surface. an adjusting rod that is screwed into the adjusting nut via a quick screw; and a spring that is fixed to one end of the adjusting rod and is rotatable in a clutch hole provided in the other of the first and second members. The clutch body is fitted into the clutch hole and cooperates with a clutch surface formed on the back wall of the clutch hole, and the sealing member is fitted into the other member to separate the clutch surface and the hydraulic chamber, The clutch body generates friction with the clutch surface when it is thrust toward the clutch surface by the hydraulic pressure of a certain value or more in the hydraulic chamber and when it receives thrust toward the clutch surface by the return spring of the brake shoe. An automatic adjustment release chamber facing the outer end surface of the clutch body is provided adjacent to the clutch hole, and the automatic adjustment release chamber allows the clutch body to be connected to the clutch body.
An automatic adjustment device for a hydraulically operated drum brake, characterized in that a pressing operation can be performed to disengage from the clutch surface.