Nsk Corporation

Keita Itagaki

Kazuto Kobayashi

Yuuki Mizushima

Soutarou Gunjima

In a manufacturing process of a corrugated cage, an intermediate assemblyis configured by press-fitting each of press-fitting portionsandrespectively provided in base end portions of rod portionsandof rivetsandinto each of through-holesandof a cage elementon one side, and nitriding treatment is performed on the intermediate assembly. An axial dimension X of each of the press-fitting portionsandis made smaller than an axial dimension Y of each of the through-holesand(X&#x3c;Y). In this way, portions which do not come into close contact with each other are provided in axial portions of the inner peripheral surface of each of the through-holesandand the outer peripheral surface of each of the rod portionsand, and thus a nitrided layer is formed on each of these portions which do not come into close contact with each other.

Method of manufacturing corrugated cage and corrugated cage

Characteristics of joint sections using rivetsthat join flat sectionsof a pair of cage elements are improved regardless of differences in the volumes of the rivets. A head sectionand a crimped sectionof a rivetcomprise flange sectionsand convex sections. The inside surfaces of the flange sectionspress against the outside surfaces of the flat sections. The convex sectionshave a truncated cone shape with the maximum diameter being on the flange sectionside. The diameter dof the apex of the convex sectionsis equal to or less than the inner diameter Rof circular holes, and the outer diameter Dof the flange sectionsis equal to or greater than the outer diameter Dof the bottom section of the convex sections. Furthermore, the amount of protrusion Lthat the flange sectionsprotrude from the convex sectionsis equal to or less than two times the thickness Tin the axial direction of the flange sections

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Fujisawa, Japan

Keita Itagaki