Nsk Corporation

Fusasuke Gotoh

Hiroshi Ishiguro

Toshihisa Ohata

Naoki Fukuda

A retainer for a ball bearing formed in a generally annular shape and having a plurality of pockets arranged in a circumferential direction, respectively, to rollably hold a plurality of balls along a pitch circle, respectively, the pockets each having an inner peripheral surface comprising a radially inner section which is located inward of the pitch circle of the balls in the radial direction of the retainer, and has an inner diameter larger than the diameter of the balls, such that the gap between the radially inner section of the inner peripheral surface of the pockets and the rolling surface of the balls gradually increases toward the opening of the pockets on the inner side in the radial direction of the retainer, and that the maximum inscribing circle of the opening of the pockets on the outer side in the radial direction of the retainer has a diameter smaller than the diameter of the balls.

Ball bearing

In a rolling bearing structured such that a plurality of rolling elements are respectively held between inner and outer rings by a retainer, grease is sealed in by a seal, a rotary body with the outer ring fitted therewith and a shaft with the inner ring fitted therewith can be connected together by a clutch mechanism and, when the rotary body and shaft are connected together by the clutch mechanism, the rolling bearing can be used on receiving a rotation load while the relative rotation between the inner and outer rings is zero, an initial radial clearance between the inner and outer rings is set such that a bearing effective clearance when the present rolling bearing is incorporated into between the rotary body and shaft can provide a positive value.

Rolling bearing

Ball Bearing

The radius of curvature r , r of the cross-sectional shape of an inner ring raceway is made smaller at a central portion and larger at end portions . A contact ellipse at the end portions is made small by increasing the radius of curvature r of the end portions to thereby secure an allowable moment load. In contrast with this, an angular gap is reduced by reducing the radius of curvature r of the central portion

Single row deep groove radial ball bearing

The radius of curvature r , r of the cross-sectional shape of an inner ring raceway lid is made smaller at a central portion and larger at end portions . A contact ellipse at the end portions is made small by increasing the radius of curvature r of the end portions to thereby secure an allowable moment load. In contrast with this, an angular gap is reduced by reducing the radius of curvature r of the central portion

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Fujisawa, Japan

Fusasuke Gotoh