Patent ID: 8342307

Claim:
A synchronizing ring for a synchronizing apparatus of a switchable gear changing transmission, comprising: a conical ring body comprising an inner friction surface and an outer installation surface which respectively bound the ring body radially in a peripheral direction and extend conically at a pre-determinable friction angle about an axial synchronizing ring axis of the synchronizing ring, wherein the ring body is bounded in the axial direction at a largest cone diameter by a gear wheel surface with a gear wheel extending substantially perpendicular to the synchronizing ring axis and is bounded at a smallest cone diameter by an additional surface, a recess provided at the additional surface of the synchronizing ring, configured for a lug provided on an inner ring to extend into the recess to thereby fix the inner ring against rotation with respect to the synchronizing ring, and a protrusion provided at the additional surface of the synchronizing ring, wherein the protrusion is configured to extend into an undercut provided at the inner ring in the installed state, wherein the protrusion is dimensioned to be fully accommodated within the undercut and not extend beyond the undercut in any of the axial, radial, or circumferential directions of the synchronizing ring.