Synchro-mesh type gear transmission

A synchro-mesh gear transmission of the type having a clutch hub which is rigidly mounted on an output power shaft, the clutch hub being provided with axial slots in which springs are axially inserted, the springs being arranged so as to urge a synchronizer ring against a conically tapered surface of a driven shift gear, the driven shift gear being mounted on the output power shaft so as to be rotatable with respect to the output power shaft, the synchronizer ring thereby exerting a frictional resistance against rotation of the driven shift gear, the driven shift gear being selectively coupled to the clutch hub by a sleeve member which is in constant meshing engagement with the clutch hub, the transmission being characterized in that there is further provided at least one guide member means in the form of a cylindrical sleeve which is held immobile in one of the axial slots in the clutch hub, one of the springs being inserted in said guide member means, so that said guide member means supports the spring therein against deformation in response to a rotational motion of the sychronizer ring.