Patent ID: 7967511

Claim:
A slewing ring, comprising: an outer ring ( 1 ), in which a load rolling groove ( 10 ) and a no-load rolling groove ( 11 ) for a large number of balls ( 4 ) are arranged along a circumferential direction of an inner peripheral surface of the outer ring ( 1 ) in parallel to each other; an inner ring ( 2 ), which is provided inside the outer ring, and in which a load rolling groove ( 20 ) and a no-load rolling groove ( 21 ) for the large number of balls ( 4 ) are arranged along a circumferential direction of an outer peripheral surface of the inner ring ( 2 ) in parallel to each other; and a plurality of ball-retaining blocks ( 3 ), which are provided in a gap between the outer ring ( 1 ) and the inner ring ( 2 ), are provided between the outer ring and the inner ring through the large number of balls rolling in the load rolling grooves, and causes the large number balls ( 4 ) to circulate in an endless manner between the load rolling groove ( 10 ) of the outer ring and the no-load rolling groove ( 21 ) of the inner ring and between the no-load rolling groove ( 11 ) of the outer ring and the load rolling groove ( 20 ) of the inner ring.