SYNCHRONIZING DEVICE WITH ASYMMETRICAL TOOTHING

摘要

In a synchronizing device (22) for shift clutches, specially of selector transmissions (2) for motor vehicles, having at least one pair of wheels of which the gearwheel coaxial with a sliding sleeve (28) has a clutch body (46) with outer tooth (48) which by axial displacement of the sliding sleeve (28), non-rotatably connected with a shaft (8) via a synchronizer body (24) and having an inner tooth (26), can be switched in and off the power flow. A synchronizer ring (50) has in peripheral direction a form-locking connection with the sliding sleeve (28) and a frictional-engagement connection with the clutch body (46) and has blocking surfaces (62, 74) for the sliding sleeve (28) which upon each relative rotation between clutch body (46) and sliding sleeve (28) prevent in the end positions defined by the form-locking connection between synchronizer ring (28) and sliding sleeve (28) an engagement of the inner tooth (26) of the sliding sleeve (28) with the outer tooth (48) of the clutch body (46) and allow the engagement only when synchronous rotational speed is attained during rotation of synchronizer ring (50) and clutch body (46). The downshift blocking surface (56) on the inner tooth (26) of the sliding sleeve (28) has an axial extension (58) smaller than the axial extension (60) of the upshift blocking surface (54).