Cage for radial roller bearing

A cage for a radial roller bearing, that is made into a single piece by injection molding using an axial draw mold having a pair of split molds,

• the cage comprising:
• a pair of rim sections, a plurality of column sections, a plurality of pockets and a fitting section, and provided with a non-continuous section at one location in the circumferential direction, wherein
• the pair of rim sections is incomplete ring shaped, and is provided concentric to each other with a space between them in the axial direction, with concave sections that are recessed in the radial direction and that are formed at positions of the circumferential surfaces of these rim sections that are aligned in the axial direction with the pockets, and the formation locations of these concave sections are opposite in the radial direction on both sides in the axial direction of the pockets;
• the column sections are provided intermittently in the circumferential direction and span between the rim sections;
• the pockets are provided in portions that are surrounded on four sides by the rim sections and the column sections that are adjacent in the circumferential direction;
• and
• the fitting section fits together end sections that are provided on both sides of the non-continuous section;
• the fitting section comprises:
• an inside fitting piece that is provided in the middle section in the axial direction of one of the end sections, and extends in the circumferential direction toward the other end section;
• and a pair of outside fitting pieces that are provided in separated portions on both sides in the axial direction of the other end section, and extend in the circumferential direction toward the one end section;
• and by placing the inside fitting piece in the portion between the outside fitting pieces, the inside fitting piece and the outside fitting pieces fit together in the axial direction without the inside fitting piece and the outside fitting pieces overlapping each other in the radial direction.