Patent ID: 6524008
Filing Date: 2003-02-25
Classification: F16C

Abstract:
A ball bearing comprising:an outer ring including on the inner peripheral surface thereof an outer ring raceway having an arc-shaped section; an inner ring including on the outer peripheral surface thereof an inner ring raceway having an arc-shaped section; and a plurality of balls respectively interposed rollably between said outer and inner ring raceways, wherein, where the outside diameter of said outer ring is expressed as D, the inside diameter of said inner ring is expressed as d, the pitch circle diameter of said respective balls is expressed as Dp, the following equations (1), (2), (3) and (4) can be satisfied: x=Db/{Dâˆ’d)/2},â€ƒâ€ƒ(1) y=Dp/{D+d)/2},â€ƒâ€ƒ(2) x&gE;0.3,â€ƒâ€ƒ(3) andy<1.0,â€ƒâ€ƒ(4) andfurther wherein, where the diameter of said respective balls is expressed as Db, the radius of curvature of the section shape of said outer ring raceway is expressed as Ro, and the radius of curvature of the section shape of said inner ring raceway is expressed as Ri, the following equations (5) and (6) can be satisfied: 0.530.65,â€ƒâ€ƒ(5) and0.520.65,â€ƒâ€ƒ(6) andfurther wherein the diameter of an inner ring raceway whose maximum circumferential stress provides 294 MPa (30 kgf/mm2) under the condition that, in case where d is in the range 6-10 mm, the interference of said inner ring is 11 &mgr;m and in case where d is in the range of more than 10 mm up to 18 mm, the interference of said inner ring is 12 &mgr;m, is expressed as Di, the following equation (7) can be satisfied: y&gE;{Dâˆ’d)/(D+d)}x+2Di/(D+d)â€ƒâ€ƒ(7).