Patent ID: 8627734

Claim:
A prestressing unit, comprising: a first ramp disk having a front side with a first annular face and a back side and a second ramp disk having a front side with a second annular face and a back side, the second annular face facing the first annular face, the first ramp disk having a plurality of first ramp contours projecting outward from the first annular face toward the second annular face and forming depressions opposite the first ramp contours on the back side of the first ramp disk, and the second ramp disk having a plurality of second ramp contours projecting outward from the second annular face toward the first annular face and forming depressions opposite the second ramp contours on the back side of the second ramp disk; each of the first ramp contours and second ramp contours forming running faces, and cylindrical rolling bodies arranged between the first ramp contours and the second ramp contours, such that the rolling bodies rise and/or fall on the running faces of the first ramp contours and the second ramp contours when the first ramp disk and second ramp disk pivot relative to each other about an axis; and wherein the running faces are inclined relative to a plane of the first annular face and a plane of the second annular face in a radial direction.