Spindle drive for a closure element of a motor vehicle

A spindle drive for a closure element of a motor vehicle, comprising:

• a power-train configured with a drive unit, and a spindle/spindle nut transmission having a spindle and a spindle nut arranged downstream of the drive unit,
• the power-train having a geometrical spindle axis configured in an axial direction of the powertrain, the power-train configured to move linearly between a spindle-side drive connection configured at a first end of the power-train and a spindle-nut-side drive connection configured at a second and opposite end of the power-train relative to the first end,
• a tubular casing part configured between the spindle-side drive connection and the spindle-nut-side drive connection, the tubular casing configured to extend along the spindle axis, the tubular casing part forming a receptacle, wherein the receptacle is configured to receive the drive unit, the drive unit having at least one of a drive motor unit, an intermediate transmission, an additional component and a torsion tube, the at least one of the drive motor unit, the intermediate transmission, the additional component and the torsion tube are arranged one behind the other in the axial direction and are axially secured with respect to the spindle-side drive connection within the tubular casing part, such that when mounted in the tubular casing part of the spindle drive, the at least one of the drive motor unit, the intermediate transmission, the additional component and the torsion tube are in interlocking engagement with respect to a circumferential direction.