Automatic gear change transmission with four forward ratios and one reverse established by means of four control members

摘要

1. Gear change with epicyclic trains combined with a torque converter in which a mechanism consisting of epicyclic trains and controlled connecting members (E1, E2, F1, F2) of the brake or clutch type introduces, by various combinations of the operations of these members, a variable speed ratio between an input shaft (5) from the converter (1) and an output member (20), characterized in that it also comprises a gathering train with two inputs (22, 25) and one output (24), one of the inputs (22) of which is connected to the said output member (20) of the said mechanism, the other input (25) of which is directly and constantly connected to the said input shaft (5) and the output (24) of which is connected to the output shaft (10) from the whole unit ; and in that the mechanism control system comprises an additional combination, normally not utilizable, causing locking of the output member (20) in rotation, which locking corresponds to an additional speed ratio for the output shaft without an additional controlled connecting member.