Synchronizer of transmission for vehicles

摘要

A synchronizer of transmission for vehicles such as an automobile has a double-mesh prevention member for permitting only one fork shaft to engage with a shift-and-select lever shaft. The gap in the engaging portion between the double-mesh prevention member and one of the forward fork shafts is selected to be greater than that between the double-mesh prevention member and the other forward fork shaft. When the shift-and-select lever shaft is operated for shifting to the reverse position, the forward fork shaft is moved by a distance corresponding to the difference in the size between the gaps mentioned above so that the synchronizer for forward transmission is put into effect to attain a synchronization between the input shaft and the output shaft.