Spindle drive for a closure element of a motor vehicle

A spindle drive for a closing element of a motor vehicle, with a spindle-nut gear for performing linear drive movements of the spindle drive between a retracted position and an extended position, wherein a spindle-side drive portion of the spindle drive has a spindle of the spindle-nut gear, wherein a nut-side drive portion of the spindle drive has a spindle nut of the spindle-nut gear, wherein the two drive portions are each connected to a drive connection, for coupling to the motor vehicle, wherein a spindle drive housing with an inner tube and an outer tube is provided, wherein the inner tube runs telescopically in the outer tube, wherein the outer tube or the inner tube has an annular sealing arrangement which is circumferential to the geometric spindle axis and slides along the respective other tube of the spindle drive housing during performance of drive movements,

• wherein the sealing arrangement has a first axial ring portion and, axially adjacent thereto relative to the geometric spindle axis, a second axial ring portion which is movably, connected to the first axial ring portion, and that on performance of drive movements, the second axial ring portion is radially displaceable, relative to the first axial ring portion between a sealing position in which a sealing effect of the sealing arrangement is greatest, and a lift-off position in which the sealing effect of the sealing arrangement is less than in the sealing position.