Parking brake assembly with wear adjustment for heavy road...

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

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F16D 65/18 (2006.01) F16D 65/14 (2006.01) F16D 65/54 (2006.01)

Patent

CA 2426189

In a disc brake (10) having a disc (16) and a brake shoe (82) movable towards and away from a friction surface (86) provided on one face of the disc (16), there is provided a parking brake (22a/22b) having a pushing member (44a/44b) for moving the brake shoe (82) towards and away from the friction surface (86) of the disc (16). The parking brake (22a/22b) further includes a cam (36a/36b) displacaeable between a first position in which the cam (36a/36b) forces the pushing member (44a/44b) against a biasing force acting thereon to maintain the brake shoe (82) in friction engagement with the disc (16) and a second position in which the pushing member (44a/44b) is free to move in a direction away from the disc (16) to release the brake shoe (82) from the friction surface (86) of the disc (16). A piston and cylinder arragement (28) is provided to displace the cam (36a/36b) between its first and second position.

L'invention concerne un frein de stationnement (22a/22b) comprenant un élément de pression (44a/44b) permettant d'écarter et de rapprocher un patin de frein (82) par rapport à une surface de friction (86) d'un disque (16), utilisé sur un frein à disque (10) se composant d'un disque (16) et d'un patin de frein (82) pouvant être écarté ou rapproché par rapport à une surface de friction (86) située sur une face du disque (16). Ce frein de stationnement (22a/22b) comprend également une came (36a/36b) pouvant être déplacée entre une première position dans laquelle elle exerce une force sur l'élément de pression (44a/44b), opposée à une force de contrainte agissant sur ce dernier, pour maintenir le patin de frein (82) en contact de friction avec le disque (16), et une seconde position dans laquelle l'élément de pression (44a/44b) peut s'écarter librement du disque (16) pour libérer le patin de frein (82) par rapport à la surface de friction (86) du disque (16). Un arrangement formé par un piston et un cylindre (28) permet de déplacer la came (36a/36b) entre la première et la seconde position.

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