Abstract: A synchronizing apparatus for transmissions and a method of manufacturing a synchronizing member therefore are disclosed. The synchronizing member is adapted to be shifted along a shift direction during gearshift. The synchronizing member has teeth protruding from a synchronizing member surface. The teeth have a trapezoidal cross-section along a direction perpendicular to the shift direction and are configured with a tip along the shift direction. A front apex line of the tip projects under a first angle (.phi.) from the synchronizing member surface. The tip is constituted by two inclined front surfaces extending on both sides of the apex line. The front surfaces intersect under a second angle (.gamma.) in an upper tooth surface. For making the second angle (.gamma.) as small as possible the front surfaces are provided with an upper section canted away from the tip.

Abstract: A gearbox-transmission, especially for power vehicles, with synchronized reverse gear, an intermediate-gearwheel providing for the reversal of direction consists of two loose-gearwheels located on the same axis which is beside the input and output shafts, of which the one loose gearwheel engages the input-shaft via a loose-gearwheel and the fixed-gearwheel of one forward-gear, and the other engages the output-shaft via the loose-gearwheel and the fixed-gearwheel of another forward-gear. The two reverse gear loose-gearwheels are connectable with each other by means of a shift-clutch. In this way no additional gearwheels are needed on the input- and output-shaft for the reverse-gear so that the structural length of such a transmission can correspondingly be reduced.