Shell type needle roller bearing and method of producing the same

Abstract

A method of producing a shell type needle roller bearing having a shell type outer ring whose opposite ends in the axial direction thereof are bent radially inwardly to form flanges; and a plurality of needle rollers arranged along an inner circumferential area of the outer ring. The method comprises the steps of: a) bending one end of the outer ring radially inwardly to form a flange portion on one end of the outer ring for forming the outer ring in the specified shape; b) assembling hardened/tempered needle rollers or un-hardened needle rollers into the outer ring; c) bending other end of the outer ring radially inwardly to form another flange to form a final shape of the needle roller bearing; d) performing a carbonitriding treatment to the assembled needle roller bearing; and then e) performing hardening and tempering treatments to the assembled needle roller bearing.

Dependencies are inferred from the claim text.