Patent ID: 8511190

Claim:
A shifting assembly ( 1 ) for shifting a reverse gear of a variable-speed gearwheel transmission, the shifting assembly comprising: a reverse-gear gearwheel ( 4 ) arranged to rotate on a transmission shaft ( 2 ) and having a first clutch tooth array ( 5 ); a clutch body ( 6 ) connected, in a rotationally fixed manner, to the transmission shaft ( 2 ) and the clutch body ( 6 ) having a second clutch tooth array ( 7 ) which is engageable with the first clutch tooth array ( 5 ) of the reverse-gear gearwheel ( 4 ); when engaging a reverse gear, the first and the second clutch tooth arrays ( 5 , 7 ) being brought into engagement with one another; a synchronizer ring ( 8 ), supporting a friction surface ( 9 ), being associated with the reverse-gear gearwheel ( 4 ), and the friction surface ( 9 ) of the synchronizer ring ( 8 ) directly engaging with a counterpart friction surface ( 16 ) during a synchronization process, and the counterpart friction surface ( 16 ) being supported by one of a forward-gear gearwheel ( 15 ) or connected, in a rotationally fixed manner, to the transmission shaft ( 2 ); the synchronizer ring ( 8 ) and the reverse-gear gearwheel ( 4 ) being rotatable relative to one another, in a circumferential direction by a limited angular amount between a blocked position and a through-connection position; at least one stressing element ( 14 ) being located between the synchronizer ring ( 8 ) and the reverse-gear gearwheel ( 4 ) and being actively connected with the synchronizer ring ( 8 ) and the reverse-gear gearwheel ( 4 ) in such manner that the synchronizer ring ( 8 ) is pre-stressed relative to the reverse-gear gearwheel ( 4 ) in a direction of the blocked position; and in the blocked position, at least one blocking element ( 10 ) preventing the first and the second clutch tooth arrays ( 5 , 7 ) from engaging with one another by positive interlock means.