Patent ID: 8303461

Claim:
A machine element, comprising: at least one rotationally symmetrical section formed from a first hollow substantially U-shaped element as viewed in longitudinal cross-section, which has a linearly extending cylindrical sidewall with a first end and a second end extending parallel to a longitudinal axis of the machine element, and a closed convex base, as viewed in cross-section from a horizontal axis of the machine element, extending from the a first end of the first sidewall and crossing the longitudinal axis of the machine element; and a second hollow substantially U-shaped element as viewed in longitudinal cross-section, which has a linearly extending cylindrical sidewall with a first end and a second end extending parallel to the longitudinal axis of the machine element, and a closed convex base, as viewed in cross-section from the horizontal axis of the machine element, extending from the first end of the first the first substantially U-shaped element and the second substantially U-shaped element are connected axially together at the second ends of the sidewalk of first and second substantially U-shaped elements so as to enclose a single cavity extending between the first substantially U-shaped element and the second substantially U-shaped element.