Locking synchronizer for a gear transmission of a motor vehicle

A locking synchronizer for a gear transmission of a motor vehicle, having loose and fixed gears, with shift sleeve means that are non-rotatably mounted on guide sleeve means and axially displaceable with tensioning of snap ring means, said shift sleeve means having shift teeth for engaging corresponding shift teeth on a loose gear and a conical surface directed radially inward for cooperation with an outer cone of a synchronizing ring means, said synchronizing ring means being equipped with a plurality of claws, distributed symmetrically around the inner circumference of the synchronizing ring means and projecting radially inward, said claws being engageable with broad gaps between said shift teeth of the loose gear, said synchronizing ring means being rotatable to a limited extent in said gaps between said loose gear shift teeth, wherein:

• said claws of said synchronizing ring means have conical inner circumferential surfaces for radially tensioning the snap ring means during a lengthwise displacement of said synchronizing ring means, and
• wherein said snap ring means is guided in radially outwardly open annular groove means in the loose gear for movement only in a radial direction while preventing axial movement of said snap ring means.