Longitudinal adjusting device for vehicle seat, with motor, upper and lower rails and three transmission mechanisms

摘要

The adjusting device has a motor (1), an upper rail (9) on the seat, a lower rail (22) on the floor, a first transmission mechanism (5) to transfer motor torque to a transmission shaft (3), a reducing transmission (29) acting on a first shaft (11), a second transmission mechanism (19) between the first shaft and a second one (17), and a third transmission mechanism (28) to adjust the relative position of the rails.