Abstract: The invention is based on an antifriction bearing, in particular an angular ball bearing, comprising two bearing rings (12a-e, 14a-e) and a plurality of rolling elements (16a-e), which are arranged between the bearing rings (12a-e, 14a-e) and held by means of a bearing cage (18a-e), and comprising at least one sensor unit (20a-e), which includes at least one sensor (22a-e) provided at least for the detection of vibrations within the antifiction bearing (10a-e). It is provided that said at least one sensor (22a-e) is arranged in the region of a contact angle (24a-e) within one of the bearing rings (12a-e, 14a-e).

Abstract: A bearing system, which may be used particularly for hot-air valves, comprising a fixed roller bearing and a floating roller bearing is provided wherein a spherical shape of the inner raceways of each bearing, a spherical shape of the rollers of each bearing, a spherical shape of the fixed bearing's outer raceway and a cylindrical shape of the floating bearing's outer raceway may enable the bearing system to compensate for all mechanically and thermally induced deflections and linear expansion of a valve's shaft relative to the valve's housing, thus reducing a risk of shortening the useful lifetime of either the fixed roller bearing or the floating roller bearing.