| 摘要 |
A brake group (2) for a transmission between a drive shaft and a driven shaft, comprising: a frame (3); elastic means (4); a first friction surface (5) which is solidly constrained to the frame (3); a second friction surface (6); a first member (7), rotatable with respect to a first rotation axis (A) and connectable to a driven shaft such as to draw the driven shaft in rotation; a second member (8), connectable to a drive shaft such as to be drawn in rotation thereby about the first rotation axis (A); the first member (7) and the second member (8) being further couplable by clutch, such that: the second member (8) can transmit drive to the first member (7); and a variation in relative angular velocity thereof corresponds to a variation in relative distance thereof. The first member (7) can slide along a parallel direction to the first rotation axis (A); the elastic means (4) act on the first member (7) such as to guarantee clutching coupling of the first member (7) with the second member (8); the first member (7) bears the second friction surface (6). The brake group is configured such that when the angular velocity of the second member (8) diminishes with respect to the angular velocity of the first member (7), the first member (7) slides along the parallel direction to the first rotation axis (A) until the second friction surface (6) presses against the first friction surface (5) in order to determine the braking of the first member (7). |
