Slip joint of a synchronization unit for transmissions

A sliding sleeve of a synchronizing unit, said sliding sleeve comprising inward directed teeth (2) formed on an inner periphery of the sliding sleeve, said sliding sleeve (1) having the following features:

• contours of the inward directed teeth (2) when projected in longitudinal direction are identical,
• flanks of the teeth (2) extend longitudinally of a central axis of the sliding sleeve (1),
• the inward directed teeth (2) mesh with an outer toothing (4) of a synchronizer body (3) that receives the sliding sleeve (1) for longitudinal displacement,
• the inward directed teeth (2) are arranged with a uniform pitch on the periphery,
• at least one further inward directed tooth (11) is arranged between the inward directed teeth (2), said further inward directed tooth (11) comprising at least one recess (11a) that is made at least in the inward pointing free end (11c) of the tooth (11) and extends toward the base of the tooth,
• in place of at least one outward directed tooth of the outer toothing (4), a longitudinal groove (7) or a radially inward extending reception is arranged opposite the recess (11a) on the synchronizer body (3), and
• at least one detent element (8) or locking element cooperating with the recess (11a) is guided in the longitudinal groove (7) or in the reception,
• characterized in that the recess (11a) is formed by a plastic displacement of material out of the inward directed tooth (11), and the displaced material (11b) extends, at least on one side of the tooth (11) as viewed in peripheral direction, beyond the contour of flank (11d) and into a gap (12), and, when the sliding sleeve (1) is being pushed onto the synchronizer body (3), the material (11b) extending into the gap (12) forms a barrier against a pushing-in of an outward directed tooth (4) into the gap (12).