Adjuster strut

Details Adjuster strut Adjuster strut

F - Mech Eng,Light,Heat,Weapons

16

D

F16D 65/56 (2006.01)

Patent

CA 2390408

Opposite ends (11, 35) of strut (10) engage opposed shoes of a drum brake. During braking, strut (10) is free to lengthen to compensate for brake lining wear. Leaf spring (24) pressing against neck (29) of nut (27) tends to extend strut (10), however this extension is opposed by the engagement of foot (40) of arm (37) with axially disposed face (32) of nut (27). Due to a resilient pivoting action of, and oblique positioning of, arm (37) with respect to cam teeth (31) on face (32) such extension forces are converted into turning of nut (27), leading to axial extension of screw (33) and thus extension of strut (10). Reverse rotation of nut (27) upon release of braking is opposed by frictional contact between it and leaf spring (24).

Les extrémités opposées (11, 35) d'une contrefiche (10) sont accouplées aux patins opposés d'un frein à tambour. Lors du freinage, la contrefiche (10) a la possibilité de s'allonger pour compenser l'usure de la garniture de frein. Un ressort à lames (24) qui prend appui sur le col (29) d'un boulon (27) tend à allonger la contrefiche (10) à l'encontre de la force résultant de l'accouplement de la base (40) du bras (37) avec la surface axialement opposée (32) du boulon (27). En raison d'une action de pivotement élastique du bras (37), et du positionnement oblique de ce dernier, par rapport aux dents obliques (31) présentes sur la surface (32), les forces d'allongement se transforment en des forces faisant tourner le boulon (27), ce qui conduit à l'allongement axial de la vis (33) et donc à l'allongement de la contrefiche (10). Lors du desserrage du frein, le contact de frottement entre le boulon et le ressort à lames (24) s'oppose à la rotation inverse du boulon (27).

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