ROLLING BEARING FOR EXTREMELY LOW-TEMPERATURE ENVIRONMENT

摘要

Provided is a rolling bearing for an extremely low-temperature environment having an elastic expanding/contracting mechanism in which: spherical-surface recessed sections (4) that have the broadest possible surface in contact with adjacent balls (3) are provided to both side surfaces in a plurality of separator-type cage pieces (A) in which ring-shaped fluororesin elements are divided in the circumferential direction in the gaps between the balls (3); also provided are notched grooves (5) shaped as V grooves passing through to both axial end surfaces, and identically shaped notched grooves (6) passing through to both the inner and outer radial circumferential surfaces; and elastic reduction in the groove widths thereof is facilitated. Compression adjustment of the width of both side surfaces allows damage due to deformation of the cage pieces (A) with excessive force to be prevented, and the cage pieces (A) to be smoothly inserted into the spaces between the rolling bodies.