Abstract: A double roller cage for a double-row cylinder roller bearing, with a central ring part (1) from which webs (2, 3) protrude axially on both sides, wherein the webs (2; 3) of one side in each case form a row of bearings (4; 5) together with the rolling bodies arranged therein, wherein every two adjacent webs (2; 3) of a row of bearings (4; 5) delimit a receiving pocket (6; 7) for a rolling body, and in which, at least in one row of bearings (5), the webs (3) are designed so as to taper in the circumferential direction for a radial filling of the receiving pockets (7) with the rolling bearings. So that the double roller cage has satisfactory running behavior and is relatively simple and cost-effective to produce, recesses (12, 12?, 13, 14, 16) are formed on the other of the two rows of bearings (4; 5) in order to produce a symmetrical mass distribution between the two rows of bearings (4; 5).

Abstract: An anti-friction bearing, including a bearing ring (2), a bearing cage (5) for receiving at least one rolling body (4), a power supply unit (8) which is configured as a claw pole generator, wherein the claw pole generator (8) includes a first claw ring (10) with a sequence of first claws (11) and a second claw ring (12) which is offset in the circumferential direction of the bearing ring (2) and has a sequence of second claws, wherein the two claw rings (10, 12) surround an induction coil (9) encircling in the circumferential direction of the bearing ring (2), wherein the claws (11) of the two claw rings (10, 12) form, with a sequence of magnetic poles (14) encircling in the circumferential direction, magnetic circuits which surround the induction coil (9).

Abstract: A bearing, in particular rolling contact bearing (1), having a first bearing ring (2), a second bearing ring (3) and an energy production unit (8) designed as a claw pole generator, wherein the claw pole generator (8) includes a first claw ring (10) with a sequence of first claws (11) and a second claw ring (12) which is offset in the revolving direction of the axis of rotation (6) and has a sequence of second claws, wherein the two claw rings (10, 12) surround an induction coil (9) encircling the axis of rotation (6), wherein the claws (11) of the two claw rings (10, 12) together with a sequence of magnetic poles (14) encircling the axis of rotation (6) form magnetic circuits surrounding the induction coil (9).