Patent ID: 7681490

Claim:
A drive device for a piston pump comprising at least one piston element of a brake system of a vehicle, by means of which device the at least one piston element is movable via an eccentric device in the longitudinal direction in a housing between a top dead center and a bottom dead center, the eccentric device having at least one noncircular eccentric element whose outer jacket face acts as a control cam for controlling the motion of the piston element, and a roller bearing device between the control cam of the eccentric element and the at least one piston element, the roller bearing device having an elasticity such that the motion of the piston element is controlled in accordance with the predefined contour of the control cam of the eccentric element, wherein the roller bearing device comprises a plurality of roller elements operatively connected via an elastic bearing cage, and an elastic outer bearing ring embracing the roller elements, the bearing ring in the installed state of the roller bearing device being disposed between the end face, oriented toward the eccentric device, of the piston element and the roller elements, and wherein the bearing ring and the bearing cage are embodied with an elasticity such that the contour of the outer bearing ring in the region of contact with the end face of the piston element corresponds to the noncircular contour of the eccentric element.