In one aspect, the invention is directed to a decoupler assembly for use between a rotating member such as an alternator shaft and a belt or other endless drive member that is used to drive the rotating member. The decoupler assembly includes a pulley, a hub and an isolator spring that is preferably a coiled, torsion spring. The two ends of the spring are engageable with, at least indirectly, the pulley and the hub for the transfer of torque therebetween. At least one of the ends of the spring engages an engagement structure (on either the pulley or the hub) that includes a helical axial shoulder and a driver wall. The spring transfers torque in one direction through the driver wall (e.g. when the pulley overruns the hub), but the spring end is not fixedly connected to the driver wall. As a result, when the hub overruns the pulley, there is relative rotation between the spring and whichever of the hub and pulley it is not fixedly connected to. Accordingly, there is relatively rotation between the spring end and the engagement structure (i.e. the helical axial shoulder and the driver wall). This causes the spring end to separate from the driver wall and to ride up the helical axial shoulder. This causes the spring to compress axially. The coils of the spring have a selected amount of spacing so that the spring can be compressed by a selected amount axially. This sets the amount of relative rotation (and therefore the amount of overrun) that is available between the pulley and the hub in that situation (e.g. in the situation when the hub overruns the pulley).
DECOUPLER ASSEMBLY HAVING LIMITED OVERRUNNING CAPABILITY
MECANISME DE DECOUPLAGE A CAPACITE DE DETOURNEMENT LIMITE
2018-04-03
Patent
Electronic Resource
English
DECOUPLER ASSEMBLY HAVING LIMITED OVERRUNNING CAPABILITY
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