| 摘要 |
A free wheel unit including a drive unit with an outer surface forming an inner race and having an annular groove in the axial center thereof in which is disposed an expandable split bearing ring, a driven unit or outer race provided with a plurality of circumferentially arranged ramped recesses in each of which is disposed a roller, the rollers being biased radially outward into engagement with the ramped recesses by the expandable split bearing ring, the split bearing ring providing friction contact to rotate the rollers down the ramped recesses into engagement with the inner race to effectively lock the driven unit to the drive unit when the latter is rotated in one direction and to rotate the rollers out of engagement with the inner race when the drive unit is rotated in the opposite direction to place the driven unit in a free wheeling condition relative to the inner drive unit.
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