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US 6,474,872 B2Granted
Ball bearing
AssigneeNsk Ltd.
InventorsToru Takamizawa, Mamoru Aoki, Takayuki Miyagawa, Hiroshi Ishiwada, Hirotoshi Aramaki
Life of this patent
Estimating the term…
Abstract
In the ball bearing, the ratio of the radius of curvature of an inner race raceway 4 to the outside diameter of balls 8, 8 is set in the range of 0.51 to 0.54. Also, the ratio of the radius of curvature of an outer race raceway 6 to the outside diameter of balls 8, 8 is set in the range of 0.54 to 0.56. Further, an interior geometric clearance c is set at 13 μm or less. Thanks to these specifications, the balls 8, 8 can be prevented from running up onto the edge of the outer race raceway 6.
Claims3
A ball bearing, comprising:
- an inner race including on the outer peripheral surface thereof an inner race raceway having an arc-shaped section;
- an outer race including on the inner peripheral surface thereof an outer race raceway having an arc-shaped section;
- a plurality of balls rollably interposed between said inner race raceway and said outer race raceway;
- and,
- a retainer for rotatably holding said balls;
- wherein the ratio ri/D8 of the radius of curvature ri of said inner race raceway to the outside diameter D8 of said balls is set in the range from 0.51 to 0.54,
- the ratio re/D8 of the radius of curvature re of said outer race raceway to the outside diameter D8 of said balls is set in the range from 0.54 to 0.56, and
- an interior geometric clearance c is set at 13 μm or less, said interior geometric clearance c being a value satisfying an equation of:
- c=D6−D4−2D8, where D4 is the diameter of the inner race raceway, D8 is the outside diameter of the balls, and D6 is the diameter of the outer race raceway.
6 more elements
A ball bearing, comprising:
- an inner race including on the outer peripheral surface thereof an inner race raceway having an arc-shaped section;
- an outer race including on the inner peripheral surface thereof an outer race raceway having an arc-shaped section;
- a plurality of balls rollably interposed between said inner race raceway and said outer race raceway;
- and,
- a retainer for rotatably holding said balls;
- wherein the ratio ri/D8 of the radius of curvature ri of said inner race raceway to the outside diameter D8 of said balls is set at 0.51 or more,
- the ratio re/D8 of the radius of curvature re of said outer race raceway to the outside diameter D8 of said balls is set at 0.54 or more,
- said ratios ri/D8 and re/D8 are respectively set in the range that can satisfy an equation of:
- 0.647×(re/D8)0.385≦(ri/D8)≦0.662×(re/D8)0.385,
- where ri is the radius of curvature of said inner race raceway, re is the radius of curvature of said outer race raceway, and D8 is the outside diameter of the balls, and
- an interior geometric clearance c is set in the range that can satisfy the relationship 0.003<(c/D8)<0.01, said interior geometric clearance c being a value satisfying an equation of:
- c=D6−D4−2D8,
- where D6 is the diameter of the outer race raceway, D4 is the diameter of the inner race raceway, and D8 is the outside diameter of the balls.
10 more elements
Dependencies are inferred from the claim text.