Shifting assembly for shifting the reverse gear of a variable speed gearwheel transmission and variable speed gearwheel transmission

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 having a second clutch tooth array (7) associated with the reverse-gear gearwheel (4);
• the first and the second clutch tooth arrays (5, 7) being brought into engagement with one another when engaging a reverse gear;
• a synchronizer ring (8) having a friction surface being associated with the reverse-gear gearwheel (4), and the synchronizer ring (8) co-operating with a counterpart friction surface (16) during a synchronization process;
• the synchronizer ring (8) and the reverse-gear gearwheel (4) being rotatable relative to one another, by a limited angular amount in a circumferential direction, 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) prevents the first and the second clutch tooth arrays (5, 7) from engaging with one another by positive interlock means.

A shifting assembly (1) in combination with a variable-speed gearwheel transmission, the shifting assembly for shifting a reverse gear of the 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 having a second clutch tooth array (7) associated with the reverse-gear gearwheel (4);
• the first and the second clutch tooth arrays (5, 7) are brought into engagement with one another for engaging the reverse gear;
• a synchronizer ring (8) having a friction surface being associated with the reverse-gear gearwheel (4), and the synchronizer ring (8) co-operating with a counterpart friction surface (16) during a synchronization process;
• the synchronizer ring (8) and the reverse-gear gearwheel (4) being rotatable relative to one another, by a limited angular amount in a circumferential direction, between a blocked position and a through-connection position;
• at least one stressing element (14) being arranged between the synchronizer ring (8) and the reverse-gear gearwheel (4) and being actively connected to 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) prevents the first and the second clutch tooth arrays (5, 7) from being forced into engagement with one another by positive interlock means.

A shifting assembly (1) for shifting the reverse gear of a variable-speed gearwheel transmission, the shifting assembly comprising:

• a clutch body (6) being connected in a rotationally fixed manner to a transmission shaft (2) and comprising a second tooth array (7);
• a reverse-gear gearwheel (4) comprising a first tooth array (5) and being rotatably supported and axially slidable on a transmission shaft (2) between a disengaged position and an engaged position, and the first tooth array (5) engaging with the second tooth array (7) when the reverse-gear gearwheel (4) is in the engaged position;
• a synchronizer ring (8) being associated with the reverse-gear gearwheel (4) and having a friction surface which co-operates with a counterpart friction surface (16) during a synchronization process;
• the synchronizer ring (8) and the reverse-gear gearwheel (4) being rotatable relative to one another, by a limited angular amount in a circumferential direction, between a blocked position and a through-connection position;
• at least one stressing element (14) being axially arranged between the synchronizer ring (8) and the reverse-gear gearwheel (4) and actively connected to the synchronizer ring (8) and the reverse-gear gearwheel (4) such 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) prevents engagement of the first and the second tooth arrays (5, 7) with one another by positive interlock means.