US Patent 7490708 Automatic traction enhancement for a transaxle

A bidirectional overrunning clutch comprising an input gear, a pair of hubs, and a roller assembly is provided. Each hub is engaged to an end of one of a pair of shaft segments of a primary drive axle. The roller assembly is disposed within the input gear and about at least a portion of each hub. The roller assembly includes rollers disposed within recesses of the roller assembly. The roller assembly also includes a spring extending from the roller assembly to exert frictional forces between the roller assembly and the hubs. In operation, rotation of the input gear causes rotation of the roller assembly. Thereafter, rotation of the roller assembly causes rotation of the hubs via the engagements between the rollers and the hubs.