Retaining piece structure

A structure of a retaining piece which is interposed between each two adjacent rolling elements in a row, the structure comprising concave surfaces at both side surfaces of said retaining piece in an axial direction of said row, each of said concave surfaces being in contact with a spherical surface of an adjacent rolling element, wherein each of said concave surfaces is configured such that as at least one of a wearing or yielding of the contact portion of said concave surface with the rolling element progress, said concave surface increases a contact area thereof with said adjacent rolling element.

A structure of a retaining piece which is interposed between each two adjacent rolling elements in a row, the structure comprising concave surfaces at both side surfaces of said retaining piece in an axial direction of said row, each of said concave surfaces being in contact with a spherical surface of an adjacent rolling element, wherein each of said concave surfaces includes:

• a linear contact portion to be in contact with said adjacent rolling element, which is located in the vicinity of an outer peripheral edge thereof;
• and
• a curved surface having a radius of curvature approximate to that of said adjacent rolling element, which is located on an inner side of said linear contact portion.

A structure of a retaining piece which is interposed between each two adjacent rolling elements in a row, the structure comprising concave surfaces at both side surfaces of said retaining piece in an axial direction of said row, each of said concave surface being in contact with a spherical surface of a adjacent rolling element, wherein a gate portion is provided in said concave surface.

A structure of a retaining piece which is interposed between each two adjacent rolling elements in a row, the structure comprising concave surfaces at both side surfaces of said retaining piece in an axial direction of said row, each of said concave surfaces being in contact with a spherical surface of a adjacent rolling element, wherein each of said concave surface comprises a holder portion which holds an ejector pin used in a process of molding said retaining piece.

A structure of a retaining piece which is interposed between each two adjacent rolling elements in a row, the structure comprising:

• concave surfaces at both side surfaces of said retaining piece in an axial direction of said row, being in contact with a spherical surface of a adjacent rolling element;
• a parting line set on an outer peripheral surface of said retaining piece, and
• at least one of a recess or a tapered portion provided in the vicinity of said parting line on said outer peripheral surface.