A BALANCER SHAFT ASSEMBLY WITH REDUCED STRESS CONCENTRATION IN CRITICAL AREAS THEREOF.

摘要

Balancer shaft assembly comprising a balancer shaft with stepped diameter and provided with a gear on one side; the balancer mass attached to the gear and a bolt for balancer shaft assembly; wherein the balancer shaft is configured with stepped outer diameter with a fillet for supporting and retaining the inner race of the bearing thereof; the bolt threads extending deep and long inside and having thread-end away from the fillet of the stepped small diameter for shifting the stress concentration zone away from the fillet. The balancer shaft effectively decouples the bolt engagement region from the fillet, eliminates stretching of the balancer shaft first smaller diameter and uniformly distributes the major principal stress developed on the balancer shaft assembly and relieves the first smaller diameter step from the axial bolt load acting thereon. Figure 5.