Retainer

A bearing device comprising an inner race, an outer race, a ball, and a retainer, the retainer including:

• a main body portion that is arranged between the inner race and the outer race, and forms a circular shape around a rotational center of the inner race;
• a plurality of pockets that are provided in a circumferential direction, and penetrate through the main body portion in a radial direction;
• and
• a retaining surface that faces the ball arranged in the pocket, and forms a C shape when viewed from the radial direction,
• wherein the retaining surface includes
• a C-shaped outer circumferential corner portion at which the retaining surface and an outer circumferential surface of the main body portion intersect with each other,
• a C-shaped inner circumferential corner portion at which the retaining surface and an inner circumferential surface of the main body portion intersect with each other,
• a first retaining surface arranged in a first rotational direction around the rotational center, with respect to the ball, and
• a second retaining surface arranged in a second rotational direction being an opposite direction to the first rotational direction, with respect to the ball,
• wherein the first retaining surface extends along a first spherical surface obtained by rotating a first virtual circle around a virtual line passing through the rotational center and a center of the ball,
• wherein the second retaining surface extends along a second spherical surface obtained by rotating a second virtual circle around the virtual line,
• wherein the first virtual circle and the second virtual circle are ellipses,
• wherein a center of the first virtual circle and a center of the second virtual circle are arranged at positions closer to a radial direction inner side than a virtual plane that has the virtual line as a perpendicular, and includes the center of the ball,
• wherein the outer circumferential corner portion is arranged at a position closer to a radial direction outer side than an outer circumferential contact point with which the ball is in contact, in a case where the ball relatively moves toward the radial direction outer side, and
• wherein the inner circumferential corner portion is arranged at a position closer to a radial direction inner side than an inner circumferential contact point with which the ball is in contact, in a case where the ball relatively moves toward the radial direction inner side.

A bearing device comprising an inner race, an outer race, a ball, and a retainer, the retainer including:

• a main body portion that is arranged between the inner race and the outer race, and forms a circular shape around a rotational center of the inner race;
• a plurality of pockets that are provided in a circumferential direction, and penetrate through the main body portion in a radial direction;
• and
• a retaining surface that faces the ball arranged in the pocket, and forms a C shape when viewed from the radial direction,
• wherein the retaining surface includes
• a C-shaped outer circumferential corner portion at which the retaining surface and an outer circumferential surface of the main body portion intersect with each other,
• a C-shaped inner circumferential corner portion at which the retaining surface and an inner circumferential surface of the main body portion intersect with each other,
• a first retaining surface arranged in a first rotational direction around the rotational center, with respect to the ball, and
• a second retaining surface arranged in a second rotational direction being an opposite direction to the first rotational direction, with respect to the ball,
• wherein the first retaining surface extends along a first spherical surface obtained by rotating a first virtual circle around a virtual line passing through the rotational center and a center of the ball,
• wherein the second retaining surface extends along a second spherical surface obtained by rotating a second virtual circle around the virtual line,
• wherein the first virtual circle and the second virtual circle are true circles,
• wherein radii of the first virtual circle and the second virtual circle are larger than a radius of the ball,
• wherein a center of the first virtual circle and a center of the second virtual circle are arranged at positions closer to a radial direction inner side than a virtual plane that has the virtual line as a perpendicular, and includes the center of the ball,
• wherein the center of the first virtual circle is arranged at a position closer to the second retaining surface than the virtual line, and
• wherein the center of the second virtual circle is arranged at a position closer to the first retaining surface than the virtual line.

A bearing device comprising an inner race, an outer race, a ball, and a retainer, the retainer including:

• a main body portion that is arranged between the inner race and the outer race, and forms a circular shape around a rotational center of the inner race;
• a plurality of pockets that are provided in a circumferential direction, and penetrate through the main body portion in a radial direction;
• and
• a retaining surface that faces the ball arranged in the pocket, and forms a C shape when viewed from the radial direction,
• wherein the retaining surface includes
• a C-shaped outer circumferential corner portion at which the retaining surface and an outer circumferential surface of the main body portion intersect with each other,
• a C-shaped inner circumferential corner portion at which the retaining surface and an inner circumferential surface of the main body portion intersect with each other,
• a first retaining surface arranged in a first rotational direction around the rotational center, with respect to the ball, and
• a second retaining surface arranged in a second rotational direction being an opposite direction to the first rotational direction, with respect to the ball,
• wherein the first retaining surface extends along a first spherical surface obtained by rotating a first virtual circle around a virtual line passing through the rotational center and a center of the ball,
• wherein the second retaining surface extends along a second spherical surface obtained by rotating a second virtual circle around the virtual line,
• wherein the first virtual circle and the second virtual circle are true circles,
• wherein radii of the first virtual circle and the second virtual circle are larger than a radius of the ball,
• wherein a center of the first virtual circle and a center of the second virtual circle are arranged at positions closer to a radial direction inner side than a virtual plane that has the virtual line as a perpendicular, and includes the center of the ball, and
• wherein the center of the first virtual circle and the center of the second virtual circle coincide with each other on the virtual line.