Spindle drive unit

A spindle drive unit, comprising

• a spindle having a spindle axis and an external circumferential surface,
• a nut embracing said spindle and being in threaded engagement with said spindle,
• at least one wiper assembly comprising at least one wiper member in wiping engagement with said external circumferential surface of said spindle, and
• an adapter being arranged axially between said nut and said wiper assembly,
• said nut, said wiper assembly and said adapter being formed independently from each other,
• said adapter being an annular ring member and being directly and removably fastenable to said nut at an axial end portion thereof in an axially and rotationally fixed manner,
• said nut having an internal circumferential surface at said axial end portion serving as a support seat for said adapter, said adapter having an axially projecting annular rib serving as a support projection engageable with the support seat, and said adapter having a radially and axially extending slot and a bore orthogonal to and opening to the slot, and said adapter being fastenable to said nut by an expander associated with the bore and the slot for widening the slot to expand the adapter radially outwardly go as to engage the support projection on the adapter with the support seat on the nut, whereby the adapter is frictionally retained on the nut,
• said wiper assembly being directly and removably fastenable to said adapter in an axially and rotationally fixed manner, said wiper assembly thus being indirectly and removably fastenable to said nut.