DISPOSITIF DE CHANGEMENT AUTOMATIQUE POUR BOITE DE VITESSES A TRAINS EPICYCLOIDAUX EQUIPES DE MOYENS D'INTERDICTION DU SERRAGE D'UN EMBRAYAGE ET/OU D'UN FREIN DE MARCHE ARRIERE

摘要

In an automatic shift of an epicyclic change-speed gear, engagement of a reverse gear brake used to shift to reverse gear is blocked until a forward gear clutch used to shift at least one forward gear is disengaged by using the working pressure of the forward gear clutch as a blocking pressure to stress a blocking control element acting upon the valve used for engaging the reverse gear brake.