MECANISMO PARA SELECCIONAR RELACIONES DE TRANSMISION

摘要

A vehicle transmission with parallel input, output and idler shafts each provided with first and second gear wheels. The first gear wheels on the input and output shafts are in constant mesh and the first gear wheel on the idler shaft meshes with the input shaft first gear wheel alone, while the second gear wheels on the input and output shaft are in constant mesh and the second gear wheel on the idler shaft meshes with the output shaft second gear wheel alone. A synchromesh clutch unit selectively connects the input shaft first and second gear wheels with the input shaft and a nonsynchromesh clutch unit selectively connects the output shaft first and second gear wheels with the output shaft to obtain a number of different output shaft ratios. The control means for the transmission is arranged to ensure that the non-synchromesh clutch unit is engaged before the synchromesh clutch unit on the selection of each output shaft ratio.