Patent ID: 8786981
Filing Date: 2014-07-22
Classification: F16C,G11B,Y10T

Abstract:
1. A bearing device comprising: a shaft; and a pair of rolling bearing portions that are arranged side by side in an axial direction of the shaft, wherein the pair of rolling bearing portions each include an inner ring that is arranged coaxially with a central axis of the shaft; an outer ring that surrounds the inner ring from an outer side of the shaft in a radial direction; and a plurality of rolling elements that are rollably retained between the inner ring and the outer ring, wherein when a separation distance between an innermost portion of the rolling elements in the radial direction and the central axis is defined as a first separation distance and a separation distance between an outermost portion of the rolling elements in the radial direction and the central axis is defined as a second separation distance, the inner rings of the pair of rolling bearing portions each include an inner ring rolling surface formed so that the external radius of an inner end portion in the axial direction is smaller than the first separation distance and formed so as to have an external radius that becomes larger than the first separation distance from an inner side toward an outer side in the axial direction, and the outer rings of the pair of rolling bearing portions each include an outer ring rolling surface formed so that the internal radius of an outer end portion in the axial direction is larger than the second separation distance and formed so as to have an internal radius that becomes smaller than the second separation distance from the outer side toward inner side in the axial direction, and wherein the outer rings of the pair of rolling bearing portions are formed integrally with each other.