Retainer cage and bearing device

A retainer cage comprising:

• a plurality of retaining portions disposed between an inner ring and an outer ring of a bearing device, the retaining portions provided at equal intervals in a circumferential direction around an axis of the inner ring;
• and
• a plurality of retaining portion joints connecting the retaining portions to each other,
• wherein the retaining portion includes:
• a bottom wall extending in the circumferential direction;
• and
• a pair of facing walls extending in axial directions parallel to the axis from both ends of the bottom wall in the circumferential direction,
• a space between the pair of facing walls forms a pocket in which a ball is disposed,
• a thickness of the retaining portion joint in a radial direction is smaller than a thickness of the facing wall in the radial direction when viewed in the axial directions, and
• when viewed in the axial directions, a central portion of the retaining portion joint in the radial direction is disposed to be shifted inward in the radial direction or outward in the radial direction with respect to a virtual circle passing through a center of each ball.

A retainer cage comprising:

• a plurality of retaining portions disposed between an inner ring and an outer ring of a bearing device, the retaining portions provided at equal intervals in a circumferential direction around an axis of the inner ring;
• and
• a plurality of retaining portion joints connecting the retaining portions to each other,
• wherein the retaining portion includes:
• a bottom wall extending in the circumferential direction;
• and
• a pair of facing walls extending in axial directions parallel to the axis from both ends of the bottom wall in the circumferential direction,
• a space between the pair of facing walls forms a pocket in which a ball is disposed, and
• the retaining portion joint is bent.