JPH0462934U

JPH0462934U -

Info

Publication number: JPH0462934U
Application number: JP10499490U
Authority: JP
Priority date: 1990-10-04
Filing date: 1990-10-04
Publication date: 1992-05-28

Description

[Brief explanation of the drawing]

第１図は本考案が適用された回転ドラムを備え
たドラムブレーキの一例を示す断面図である。第
２図は第１図の要部拡大図であつて、回転ドラム
の開口側端部とバツキングプレートとの間が閉じ
られた状態を示す図である。第３図は環状部材に
作用する遠心力に基づいて回転ドラムの開口側端
部とバツキングプレートとの間が開かれた状態の
一例を示す図であつて、第２図に対応する図であ
る。第４図はバイメタルの変形に基づいて回転ド
ラムの開口側端部とバツキングプレートとの間が
あ開かれた状態の一例を示す図であつて、第２図
に対応する図である。第５図は従来のドラムブレ
ーキの要部を示す図であつて、第２図に対応する
図である。１０……回転ドラム、１６……周壁、３０……
バツキグプレート、｛４２……バイメタル、４８
……環状部材｝開閉弁手段。 FIG. 1 is a sectional view showing an example of a drum brake equipped with a rotating drum to which the present invention is applied. FIG. 2 is an enlarged view of the main part of FIG. 1, showing a state in which the space between the open end of the rotary drum and the backing plate is closed. FIG. 3 is a diagram corresponding to FIG. 2, showing an example of a state in which the opening side end of the rotating drum and the bucking plate are opened based on the centrifugal force acting on the annular member. be. FIG. 4 is a view corresponding to FIG. 2, showing an example of a state in which a gap is opened between the opening side end of the rotating drum and the bucking plate based on the deformation of the bimetal. FIG. 5 is a diagram showing the main parts of a conventional drum brake, and corresponds to FIG. 2. 10... Rotating drum, 16... Peripheral wall, 30...
Batsukig plate, {42...bimetal, 48
...Annular member} Opening/closing valve means.

Claims

[Claims for Utility Model Registration] A cylindrical shape with a bottom and a circumferential wall, rotatable around an axis, and a position disposed close to and facing the open end of the circumferential wall. In a rotating drum for a drum brake in which the opening side of the peripheral wall is covered by a fixed backing plate, when the rotational speed of the rotating drum is below a predetermined value and the temperature of the surrounding wall is below a predetermined temperature, the opening side of the surrounding wall is covered with a fixed backing plate. The gap between the end portion and the bucking plate is closed over the entire circumference, but when the rotational speed of the rotating drum exceeds the predetermined value and/or the temperature of the circumferential wall exceeds the predetermined temperature, the circumferential wall A rotary drum for a drum brake, characterized in that an opening/closing valve means for opening between an opening side end of the drum and the bucking plate is provided on the peripheral wall.