| 摘要 |
The invention relates to a gear engagement device for an automatic transmission maintained in a mechanism case (11) standing against a clutch housing (10), comprising an electric motor, at least one reduction stage for the rotational movement of the electric motor between two rotating parts followed by a stage for converting the rotational movement of an axially immobilized nut (21) into a translational movement of a drive shaft (20) for a gear engaging fork (30) immobilized in rotation, characterised in that the nut (21) moves the drive shaft (20) in translation via at least one pin (26) transverse to the shaft, which is guided both in a radial housing of the nut (21) and on the shaft (20), while being maintained between those two parts in one of two helical guide threads (21b, 20b) 180° opposite one another. |
