| 摘要 |
<p>The invention provides a power transmission device in which the switching mechanism and control operation can be simplified. Regions of a first sprag (4) and a second sprag (5) on the side of an inner race (2) are retained by an inner retainer (6), and regions of the first sprag (4) and the second sprag (5) on the side of an outer race (3) are retained by an outer retainer (7). Different directions are established for the relative rotation in which the first sprag (4) engages the inner race (2) and the outer race (3), and the relative rotation in which the second sprag (5) engages the inner and outer races, whereby the inner retainer (6) and the outer retainer (7) are caused to move relative to each other about an axial center O by a load imparting device (20), and either the first sprag (4) or the second sprag (5) can be made to engage the inner race (2) and the outer race (3). The combined retention of the first sprag (4) and the second sprag (5) by the inner retainer (6) and the outer retainer (7) actuates the load imparting device (20) to allow the power transmission direction to be switched all at once, resulting in a simpler switching mechanism and control operation.</p> |
