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US 6,554,480 B2Granted
Single row deep groove radial ball bearing
AssigneeNsk Ltd.
InventorsHiroshi Ishiguro, Fusasuke Gotoh, Toshihisa Ohata
Life of this patent
Estimating the term…
Abstract
The radius of curvature r1, r2 of the cross-sectional shape of an inner ring raceway lid is made smaller at a central portion 19 and larger at end portions 20. A contact ellipse at the end portions is made small by increasing the radius of curvature r2 of the end portions 20 to thereby secure an allowable moment load. In contrast with this, an angular gap is reduced by reducing the radius of curvature r1 of the central portion 19.
Claims12
A single row deep groove radial ball bearing comprising:
- an inner ring having a deep groove inner ring raceway provided at an outer circumferential surface of said inner ring;
- an outer ring having a deep groove outer ring raceway provided at an inner circumferential surface of said outer ring;
- and
- a plurality of balls rotatably provided between said inner ring raceway and said outer ring raceway;
- wherein at least one of said inner ring raceway and said outer ring raceway has a cross-sectional shape in which a transversely central portion thereof is different in a radius of curvature from transverse end portions between which said transversely central portion is interposed;
- wherein transverse end edges of said portions having different radius of curvatures are made to be smoothly continuous with each other;
- wherein the radius of curvature of the transversely central portion is smaller than that of the transverse end portions;
- and
- wherein the transversely central portion has a central angle in the range of 25 to 35 degrees on each side of a center line in the transverse direction.
6 more elements
A single row deep groove radial ball bearing comprising:
- an inner ring having a deep groove inner ring raceway provided at an outer circumferential surface of said inner ring;
- an outer ring having a deep groove outer ring raceway provided at an inner circumferential surface of said outer ring;
- and
- a plurality of balls rotatably provided between said inner ring raceway and said outer ring raceway;
- wherein at least one of said inner ring raceway and said outer ring raceway has a cross-sectional shape in which a transversely central portion thereof is different in a radius of curvature from transverse end portions between which said transversely central portion is interposed;
- wherein transverse end edges of said portions having different radius of curvatures are made to be smoothly continuous with each other;
- wherein the radius of curvature of the transversely central portion is larger than that of the transverse end portions;
- wherein the transversely central portion has a central angle in the range of 25 to 35 degrees on each side of a center line in the transverse direction;
- wherein each of said transverse end portions has a central angle in the range of 25 to 35 degrees on each side of the center line in the transverse direction;
- and
- wherein the radius of curvature of the transversely central portion is set to be in the range of 53% to 55% of the outside diameter of the ball.
8 more elements
Dependencies are inferred from the claim text.