JPH0393632U

JPH0393632U -

Info

Publication number: JPH0393632U
Application number: JP181290U
Authority: JP
Priority date: 1990-01-11
Filing date: 1990-01-11
Publication date: 1991-09-25
Anticipated expiration: 2005-01-11
Also published as: JPH0720427Y2

Description

[Brief explanation of drawings]

第１図は本考案が適用されたシユー間隙自動調
節機構を備えたドラムブレーキの一例を示す図で
あつて、要部を示す正面図である。第２図は第１
図の−視断面の要部を拡大して示す図である
。第３図は第２図において調節部材の回動に伴つ
て引張コイルスプリングが伸張させられた状態を
示す図である。第４図は従来のシユー間隙自動調
節機構を備えたドラムブレーキの要部を示す図で
あつて、第２図に相当する図である。１２，１４……ブレーキシユー、１８……シユ
ーウエブ、２８……パーキングレバー、４０……
調節部材、４４……引張コイルスプリング、４６
……コイル部、５４……板面。 FIG. 1 is a diagram showing an example of a drum brake equipped with an automatic shoe gap adjustment mechanism to which the present invention is applied, and is a front view showing the main parts. Figure 2 is the first
FIG. 2 is an enlarged view showing a main part of a cross-section viewed from - in the figure. 3 is a diagram showing a state in which the tension coil spring is expanded as the adjustment member rotates in FIG. 2; FIG. FIG. 4 is a diagram showing essential parts of a conventional drum brake equipped with an automatic shoe gap adjustment mechanism, and corresponds to FIG. 2. 12, 14... Brake shoe, 18... Shoe web, 28... Parking lever, 40...
Adjustment member, 44...Tension coil spring, 46
...Coil part, 54...Plate surface.

Claims

[Scope of Claim for Utility Model Registration] A pair of brake shoes having an arc-shaped and plate-like shoe web, and one of the pair of brake shoes is rotatably provided and is rotated by the parking brake operating force. a parking lever that opens the pair of brake shoes relative to each other based on the above, an adjusting member rotatably provided on the one brake shoe and rotated as the parking lever rotates, and a coil. and is stretched between the one brake shoe and the adjustment member, and urges the tension member in a rotational direction opposite to the brake operating direction of the parking lever;
When braking is not applied, at least a portion of the coil portion is located on the plate surface of the shew web of the one brake shoe, and when the parking brake is applied, the coil portion is positioned on the plate surface of the shew web as the adjustment member rotates. a tension coil spring that is stretched while being pressed so that a part of the coil portion located on the plate surface of the shew web is moved inward from the inner peripheral edge of the shew web; In a drum brake equipped with an automatic shoe gap adjustment mechanism of a type that automatically adjusts a shoe gap based on rotation, when the coil portion of the tension coil spring expands due to braking of the parking brake, one of the brake shoes By forming the part of the shew web that can be moved inward from the inner circumferential edge of the shew web to have a smaller diameter than the part that is positioned on the plate surface of the shew web even when the shew web is extended, the parking brake of the coil part can be applied. A drum equipped with an automatic show gap adjustment mechanism, characterized in that a predetermined gap is formed between a portion of the show web that is moved further inward than the inner circumferential edge of the show web and a plate surface of the show web when braking is not applied. brake.