A roller has a circular disk body having means defining a center aperture disposed in the center thereof and means defining a plurality of retaining groove opening into the circumference of the center aperture and extending parallel to the axis of said center aperture to define bearing roller races, each the retaining groove having a nearly major arc in section effective to retain bearing rollers in the retaining grooves; a plurality of bearing rollers disposed in said retaining grooves; and a shaft inserted through the center aperture in contact with the bearing rollers.
A composite rolling and sliding bearing comprising an outer and inner ring and a plurality of intermediate bearing elements arranged therebetween. Each of the bearing elements is provided on one side with a convexedly formed face adapted to slide and roll against one ring and on the opposing side with suitable means for tilting or rocking the element with respect to the other ring.
