| 摘要 |
<p>A freewheel coupling comprises two hubs (1, 2), the one with rolling elements (3) distributed around a circumference coaxial with the axis of rotation, the other with corresponding notches (4), and at least one ring (5) occupying a seating (7) formed coaxially in one hub (2) and establishing a coaxial annular race (10) with radial slots (12) through which to insert bolts (11) projecting radially from the ring, the ring (5) itself incorporating frontal teeth (13) insertable in corresponding sockets (14) afforded by the face of the opposite hub (1); the axial dimension of the teeth (13) is such that when the rolling elements (3) and the teeth (13) are unseated from the notches (4) and the sockets (14), and the ring (5) is locked in a given position by a detent and plunger mechanism (52, 9), the teeth can re-engage the sockets (14) and draw the ring (5) back into synchronous rotation only if the driving hub (2) is rotated in the direction opposite to that of normal operation. <IMAGE></p> |
