Abstract: A large open-center roller bearing consisting of single or multiple outer and inner rings with rollers rolling over races between the rings, wherein one ring can accommodate an ultrasonic probe and the other ring has a contact surface. The object is to provide a bearing that can be simply and reliably tested by ultrasound. One or more contact surfaces (19, 24, and 25) extend around one or more of the outer surfaces of the ring (2 or 3) being tested.

Abstract: To provide a center-free large rolling bearing in which firstly the ready standby bearing is not subjected to the full operating load during operation of the first bearing and secondly after failure of the first bearing the standby bearing can be used in simple and economic manner, in a center-free large rolling bearing in double constructional form having three bearing races (1, 2, 3), two of which are rotatable independently of each other and with respect to the third, and arranged therebetween rolling element rows (4, 5, 6, 7, 8, 9) for rotational connection of two components (11, 13), a center race (1) being fixedly connectable to a first component (11) and an outer race (2) or an inner race (3) fixedly connectable to a second component (13), it is proposed that the center race (1) consists of a plurality of sub-races (15, 16), that the outer race (2) connected to the second component (13) likewise consists of a plurality of sub-races (20, 21) and a parting line (22) of said outer race is disposed substan

Abstract: A safety mounting for large antifriction bearings comprises rolling members disposed at a first bearing ring, a second bearing ring engages the rolling members, and a combined attachment and retainer provision is disposed at the first bearing ring and positively locks the second bearing ring. The attachment aspect of the provision provides for mounting of connecting constructions to the bearing ring. These safety mountings are particularly suited for large antifriction bearings at excavators, dredgers and cranes. The combined attachment and retainer provision allows to save material, space and time.