Patent ID: 10247257

Abstract:
A synchronizer (10) for a gear transmission has a synchronizer body (12), which is associated to a transmission shaft, and a first and a second synchronizer ring (32, 34, 36, 38) which are associated to a first and a second transmission gear (28, 30). Furthermore, the synchronizer (10) has a sliding sleeve (26) and at least one thrust piece (18) which is shiftably arranged on the synchronizer body (12) and can exert an axial compressive force on the corresponding synchronizer ring (32, 34, 36, 38). Furthermore, the synchronizer (10) includes an elastic actuating element (20) which is active between the sliding sleeve (26) and the thrust piece (18), wherein on the sliding sleeve (26) a detent recess (50) for the neutral position as well as a release contour (54) are provided. The release contour (54) can cooperate with the actuating element (20) such that when the sliding sleeve (26) is shifted for being engaged with one of the transmission gears (28, 30), the thrust piece (18) is urged away from the corresponding synchronizer ring (32, 34, 36, 38). The release contour (54) has an axial length which is not more than twice the idle stroke of the sliding sleeve (26) between the neutral position and the position in which the corresponding synchronizer ring (32, 34, 36, 38) presses against an associated friction surface.