STRUCTURE OF SLEWING RING BEARING

摘要

A slewing ring bearing has an outer ring having first and second circumferential grooves parallelly formed in the inner circumferential surface of the outer ring, an inner ring provided on the inner side of the outer ring and having first and second circumferential grooves parallelly formed in the outer circumferential surface of the inner ring so as to correspond to the first and second circumferential grooves of the outer ring, a first rolling body row provided in the first circumferential groove of the outer ring and the first circumferential groove of the inner ring, and a second rolling body row provided in the second circumferential groove of the outer ring and the second circumferential groove of the inner ring. The inner ring rotates relative to the outer ring in the opposite direction to the outer ring with the first rolling body row and the second rolling body row in between. A first preload to the rolling bodies of the first rolling body row is greater than a second preload to the rolling bodies of the second rolling body row.