Patent ID: 9133879
Filing Date: 2015-09-15
Classification: F16C

Abstract:
1. A turning bearing comprising: an outer ring provided on an inside circular surface thereof with two rows of radially inward grooved races located radially inward of the outer ring, each radially inward grooved race having a V-shape in a transverse cross-section, an inner ring provided on an outside circular surface thereof with two rows of radially outward grooved races located radially outward of the inner ring, each radially outward grooved race having a V-shape in a transverse cross-section, the radially outward grooved races of the inner ring lying in opposition to the radially inward grooved races of the outer ring, a plurality of rollers lying in raceways defined between the radially inward grooved races and the radially outward grooved races to circulate through the raceways while bearing loads as the outer ring and the inner ring rotate relative to each other, and a plurality of separators lying in the raceways in an arrangement interposed between the rollers adjoining each other, wherein the radially inward grooved races on the outer ring each have a race surface lying widthwise outwards of the outer ring to come into rolling contact with circular rolling surfaces of the rollers and a guide part lying widthwise inwards of the outer ring to bear one of axially opposite ends of the rollers in a sliding manner while turning relative to the one of the axially opposite ends of the rollers, wherein the radially outward grooved races on the inner ring each have a race surface lying widthwise inwards of the inner ring to come into rolling contact with the circular rolling surfaces of the rollers and a guide part lying widthwise outwards of the inner ring to bear other of axially opposite ends of the rollers in a sliding manner while turning relative to the other of the axially opposite ends of the rollers, wherein the guide parts in the radially inward grooved races and the radially outward grooved races include guide surfaces each of which is provided on either of the radially inward grooved races of the outer ring and the radially outward grooved races of the inner ring to guide the axially opposite ends of the rollers, and relief sides reaching bottoms of the radially inward grooved races and the radially outward grooved races, wherein the inside circular surface of the outer ring lying on a side of the race surface is more biased radially inwards toward an axial center of the bearing than the inside circular surface lying on the side of the guide surface so that the inside circular surface on the outer ring is staggered or different in level on opposite sides of the radially inward grooved race to make the race surface larger than an effective contact length of the circular rolling surfaces of the rollers and correspondingly make a length of the guide part in widthwise dimension smaller than the race surface, and wherein the outside circular surface of the inner ring lying on the side of the race surface is more biased radially outwards away from the axial center of the bearing than the outside circular surface lying on the side of the guide surface, so that the outside circular surface on the inner ring is staggered or different in level on opposite sides of the radially outward grooved race to make the race surface larger than the effective contact length of the circular rolling surface of the roller and correspondingly make a length of the guide part in widthwise dimension smaller than race surface, and wherein a loading hole to charge or incorporate the rollers with the separators into the raceway is provided in either of the outer ring and the inner ring, and an opening edge of the loading hole exposed to the raceway lies across an overall width of the race surface and the relief side in the guide part, but apart away from the guide surface.