Improved coil spring for overrunning spring clutches

Details Improved coil spring for overrunning spring clutches Improved coil spring for overrunning spring clutches

F - Mech Eng,Light,Heat,Weapons

16

D

F16D 41/20 (2006.01)

Patent

CA 2268833

A coil spring (50) for use in an overrunning spring clutch assembly having a central arbor (16) for centering and supporting the coil spring (50) in an overrunning operating mode. The coil spring (50) includes teaser coils (52) disposed at each end thereof, central coils (54) disposed intermediate the teaser coils (52), and transition coils (56) disposed between and adjoining the teaser coils (52) and the central coils (54). The coil spring (50) is characterized by each of the transition coils (56) having an interface surface (56IS) being substantially complementary to a corresponding external bearing surface (16ES) defined by the central arbor (16) of the spring clutch assembly. Such substantially complementary relationship limits the radial deflection of the transition coils (56) in the overrunning operating mode, thereby reducing vibratory bending stresses in the coil spring (50).

Cette invention concerne un ressort hélicoïdal (50) destiné à être utilisé dans un ensemble embrayage à roue libre à ressort comprenant un arbre central (16) qui sert à centrer et à supporter le ressort hélicoïdal 850) dans un mode de fonctionnement à roue libre. Le ressort hélicoïdal (50) comporte des spires d'amorce (52) disposées à chacune de ses extrémités, des spires centrales (50) disposées entre les spires d'amorce (52) et des spires de transition (56) disposées contre les spires d'amorces et entre ces dernières et les spires centrales (54). Le ressort hélicoïdal (50) se caractérise par le fait que chaque spire de transition ncomporte une surface (56IS) d'interface qui est sensiblement complémentaire à une surface (16ES) de support externe correspondante définie par l'arbre central (16) de l'ensemble embrayage à ressort. Cette relation sensiblement complémentaire limite la déflexion radiale des spires de transition (56) dans le mode de fonctionnement à roue libre, ceci ayant pour effet de réduire les contraintes de flexion vibratoires dans le ressort hélicoïdal (50).

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