Patent ID: 8944696
Filing Date: 2015-02-03
Classification: F16C

Abstract:
1. A cage for a radial roller bearing, which is made by axial draw molding of synthetic resin that uses a mold comprising a pair of split molds, comprising: a pair of rim sections that are circular ring shaped and that are concentric with each other, being separated by an interval in an axial direction; a plurality of column sections that are intermittently provided in a circumferential direction and span between the rim sections; and a plurality of pockets that are provided in portions that are surrounded on four sides by the rim sections and column sections that are adjacent in the circumferential direction, wherein outer-diameter side concave sections that are recessed inward in a radial direction are provided at a plurality of locations on outer circumferential surfaces of the rim sections in portions that are aligned in the axial direction with the pockets, and inner-diameter side concave sections that are recessed outward in the radial direction are provided at a plurality of locations on inner circumferential surfaces of the rim sections in portions that are aligned in the axial direction with the pockets and that have a phase in the circumferential direction that is different than a phase in the circumferential direction of the outer-diameter side concave sections, wherein the phase in the circumferential direction of the outer-diameter side concave sections and the phase in the circumferential direction of the inner-diameter side concave sections differ between one rim section and the other rim section of the rim sections, and the outer-diameter concave sections and the inner-diameter concave sections are arranged one at a time in portions of the rim sections that are located on both sides in the axial direction of the pockets, wherein each of the rim sections is an incomplete ring shape having a cut in one location in the circumferential direction, and by expanding widths of the cuts in the circumferential direction, it is possible to elastically expand diameters of the rim sections, and in the one rim section and the other rim section, phases of the cuts virtually coincide in the circumferential direction, wherein an elastic connecting section that can elastically deform in the circumferential direction is provided to span between end sections of the rim sections and the plurality of column sections on both sides of the cuts that can move apart from or toward each other in the circumferential direction, and wherein one end section of both end sections in the circumferential direction on both sides of the cut in one rim section that face each other, and the end section on the opposite side in the circumferential direction for the one end section of both end sections in the circumferential direction on both sides of the cut in the other rim section that face each other are connected together by the elastic connecting section.