Patent ID: 8197145
Filing Date: 2012-06-12
Classification: F16C

Abstract:
1. A revolving joint comprising: at least one rolling contact bearing and an electromotive drive unit; the rolling contact bearing includes at least one row of rolling bodies arranged around a rotational axis of the joint, at least one running track driven by the drive unit and the rolling bodies are in contact with the at least one track; at least a surface of the running track in contact with the rolling bodies is described by a number of surface lines adjacent and parallel to one another with profiles which are each wave-shaped in the circumferential direction and which therefore deviate from an imaginary ideal profile and the track surface encircles the rotational axis of the joint and is entirely in the form of a circular curve; the joint is configured and operable so that it generates a measurable running noise at the electromotively driven revolving joint, the noise being measured as air-borne sound and has sound pressure levels with values of at most 72 dB(A); the profiles of the surface lines are each described by waves which follow one another in an alternating manner in the circumferential direction and thereby repeatedly intersect the particular ideal profile; the maximum value of all of waviness amplitudes between a wave crest and a wave trough of any desired number of periods of a measuring range on one of the surface lines in each case corresponds at maximum to a quotient of the constant 0.33 in mm/min and of the rotational speed of the driven running track in rpm; and the measuring range is defined by the nominal size of the curve length along the running track between the respective contacts with the running track of two rolling bodies of a row of rolling bodies that follow one another in the circumferential direction.