Reduction One-Way Clutch: Operation

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The reduction one-way clutch outer race (reduction sun gear) rotates clockwise (seen from the side cover) freely, but the sprags rise to lock the rotation when the outer race tries to rotate counterclockwise.
The reduction one-way clutch locks the counterclockwise rotation of the reduction sun gear
NOTE: All direction of rotation are viewed from the side cover.

Fig 1: Identifying Reduction One-Way Clutch Operation
Courtesy of MAZDA MOTORS CORP.