| 主权项 |
1. An uncoupling device, particularly for universal joint transmissions, comprising:
a cylindrical casing, which is integral with a fork of a universal joint, comprising a plurality of radial slots provided on the inner circumferential surface of the casing; a pawl supporting cage, which is integral with a rotation shaft, comprising a plurality of radial seats, and is accommodated rotatably within the casing; a plurality of pawls adapted to be accommodated in the radial seats of the cage, the pawls being radially movable within the radial seats, each one comprising a foot that is interposed between two plates adapted to push radially outward the pawls, and a head that is adapted to engage in the radial slots of the casing, the pawls being adapted to pass from a coupling configuration, in which the heads are coupled in the radial slots, in order to transmit torque and power between the casing that is integral with the fork of the universal joint and the cage that is integral with the rotation shaft, to an uncoupling configuration, in which the heads are released from the radial slots and slide circumferentially on the inner circumferential surface of the casing, in order to uncouple the transmission of torque and power between the casing and the cage, further comprising an annular element, which can move axially between a retracted position and an advanced position, the annular element comprising a plurality of tongues that protrude axially and are aligned axially with the radial slots, and means for the axial movement of the annular element, in the coupling configuration, the annular element being in the retracted position, the radial slots being occupied by the heads of the pawls, in the uncoupling configuration the axial movement means of the annular element actuating the transition of the annular element from the advanced position to the retracted position and vice versa, in the advanced position, the tongues occupying the radial slots of the casing, left free by the pawls. |
