Abstract: The present invention relates to a longitudinal seat adjustment unit (2), comprising a drive device (22), two rails (40) each with at least one spindle (42), which are arranged parallel to a longitudinal axis (X) and so as to be spaced apart from each other, and two drive trains (24) that can be driven by the drive device (22), wherein each of the drive trains (24) has a first transmission unit (31) and a second transmission unit (32), and the second transmission unit (32) is coupled to the drive device (22) via the first transmission unit (31), and wherein the second transmission unit (32) of the respective propulsion train (24) is coupled to one of the rails (40) in order to generate a propulsion in the longitudinal axis (X).

Abstract: A planet carrier of a planetary gearbox has a first contact surface and a second contact surface. The first contact surface and/or the second contact surface are divided by a connecting straight line running through the planet carrier axis of rotation and the planet gear axis of rotation into a first contact surface portion and a second contact surface portion. The first contact surface portion encloses a first angle with the connecting straight line, the second contact surface portion encloses a second angle with the connecting straight line, the first angle and the second angle lie in a plane perpendicular to the planet carrier axis of rotation, and the first angle and the second angle are unequal and at least one of the angles is greater than 90°. The invention further relates to a planetary gearbox having a planet carrier of this kind and at least one planet gear.

Abstract: A longitudinal adjustment unit of a seat, particularly of a seat in a motor vehicle can include a housing with a through-hole arranged along a longitudinal axis and having a first spindle opening and a second spindle opening, a spindle that can be guided through the through-hole along the longitudinal axis through the housing, a spindle nut, and a screw driving the spindle nut and supported in the housing via a bearing located on both sides. The spindle nut can be supported in the housing in the longitudinal axis so that it can be rotated bidirectionally and axially. Also, at least one fastener can be provided, through which the spindle is connected to the spindle nut in a torque-free manner.

Abstract: A longitudinal adjustment unit of a seat, particularly of a seat in a motor vehicle can include a housing with a through-hole arranged along a longitudinal axis and having a first spindle opening and a second spindle opening, a spindle that can be guided through the through-hole along the longitudinal axis through the housing, a spindle nut, and a screw driving the spindle nut and supported in the housing via a bearing located on both sides. The spindle nut can be supported in the housing in the longitudinal axis so that it can be rotated bidirectionally and axially. Also, at least one fastener can be provided, through which the spindle is connected to the spindle nut in a torque-free manner.