S-cam for drum brake

F - Mech Eng,Light,Heat,Weapons – 16 – D

Patent

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Details

F16D 51/28 (2006.01) F16D 65/14 (2006.01) F16D 65/22 (2006.01)

Patent

CA 2102991

An S-cam assembly (33) is disclosed for expanding internal shoe brakes of the type comprising a pair of pivotally mounted brake shoes (17) located within a brake drum (11), each brake shoe carrying a cam follower (31). The assembly comprises an S-cam member (35) comprising a pair of substantially identical working portions (37), each working portion defining a working surface(39) and defining a nominal lift circle having a diameter D1. Each working portion includes a ramp member (43) pivotable about a pin (47) from a retracted position (FIG. 2) in which a ramp surface (51) is disposed within the nominal lift circle. Each ramp member has an extended position (FIG. 5) in which the ramp surface is disposed outward of the nominal lift circle and in engagement with the adjacent cam follower (31) and defining a larger lift circle having a diameter D2. The substantially increased reserve lift is accomplished without increasing the minimum installation diameter of the S-cam assembly.

Ensemble de came en S (33) pour écarter les freins à sabot internes du type comprenant des sabots de frein montés de manière à pivoter (17) situées à l'intérieur d'un tambour de frein (11), chaque sabot de frein comprenant un excentrique (31). L'ensemble comprend un élément de came en S (35) comprenant deux parties de fonctionnement essentiellement identiques (37), chaque partie définissant une surface de fonctionnement (39) et définissant un cercle de déplacement limite ayant un diamètre D1. Chaque partie de fonctionnement inclut un excentrique (43) pivotant autour d'une tige (47) depuis une position rétractée (FIG. 2) dans laquelle une surface d'excentrique (51) est placée à l'intérieur du cercle de déplacement limite. Chaque excentrique comprend une position prolongée (FIG. 5) dans laquelle la surface d'excentrique est placée à l'extérieur du cercle de déplacement et engagée avec le galet suiveur contigu (31) et définissant une cercle de déplacement plus large ayant un diamètre D2. Le déplacement de réserve essentiellement augmenté est accompli sans augmenter le diamètre d'installation minimum de l'ensemble de came en S.

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