Actuating drive for a rail guide of a longitudinal adjustment of a motor vehicle seat

摘要

An actuating drive for a rail guide of a longitudinal adjustment of a motor vehicle seat has a rotational drive, which has an output shaft (70), and a transmission, which has a spindle nut (54), which is rotationally connected to the output shaft (70) and which has a spindle (52). The spindle (52) has a spindle thread, with which the spindle nut (54) is engaged. The spindle (52) is curved in a circular radius of curvature (42). The radius of curvature (42) is between 1,500 and 3,000 mm. The spindle nut (54) is a straight nut.

主权项

1. A motor vehicle seat comprising:
a seat frame; a seat region; a backrest; an actuating drive of a longitudinal adjustment mechanism, the actuating drive comprising a rotary drive unit having an output shaft and a gear unit comprising a spindle nut rotationally connected to the output shaft, the spindle nut has an axial length of less than 20 mm, and a spindle comprising a spindle thread with which the spindle nut is in engagement, the spindle being curved in a circular radius of curvature between 1,500 and 3,000 mm and the spindle nut being a straight nut; and a rail guide comprising at least one pair of rails having a floor rail, a seat rail and balls disposed between the pair of rails, the rails of the pair of rails being displaceable relative to each other along a displacement path in a longitudinal direction, which is substantially parallel to an x-axis, the seat rail comprising fastening bolts for fastening the seat frame to be disposed above the pair of rails, the floor rail and the seat rail each being curved with the same circular radius of curvature as the spindle, a center of curvature being located on a side of the pair of rails facing away from the seat frame, and the spindle being non-rotatably connected to the floor rail, wherein the seat frame is connected to the fastening bolts, wherein the floor rail and the seat rail delimit a channel-shaped cavity accessible only in an x-direction, corresponding to a vehicle travel direction, and the spindle is located in the cavity, and a center of curvature of the radius of curvature is located on a plane that is parallel to an x-z-plane.