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Deep groove ball bearing and bearing device

A deep groove ball bearing has an inner ring, an outer ring and a plurality of balls located between the inner ring and the outer ring. A profile deformation quantity of a raceway groove of the inner ring and a profile deformation quantity of the outer ring are limited to values at which the maximum surface pressure values of them are each 1.6 GPa or smaller.

1. A deep groove ball bearing comprising: an inner ring; an outer ring; and a plurality of balls located between the inner ring and the outer ring, wherein a profile deformation quantity i (mm) of a raceway groove of the inner ring and a profile deformation quantity o (mm) of a raceway groove of the outer ring are defined by the following equations (1) and (2) 5 iQ36(1Ei)2(1.0003+0.5968RxiRyi){1.5227+0.6023ln(RyiRxi)}RxiRyiRxi+Ryi wherein 1Ei=12(1-vi2Ei+1-va2Ea) Rxi=Da2dm-Da cos dm Ryi=riDa2ri-Da cos =ri+ro-(Da+c/2)ri+ro-Da(1) oQ89(1Eo)2(1.0003+0.5968RxoRyo){1.5227+0.6023ln(RyoRxo)}RxoRyoRxo+Ryo wherein 1Eo=12(1-vo2Eo+1-va2Ea) Rxo=Da2dm+Da cos dm Ryo=roDa2ro-Da cos =ri+ro-(Da+c/2)ri+ro-Da(2) where dm: pitch circle diameter (mm) Da: ball diameter (mm) c: diameter clearance (mm) ri: radius (mm) of the raceway groove of the inner ring ro: radius (mm) of the raceway groove of the outer ring Ei: Youngs modulus of the inner ring i: Poissons ratio of the inner ring Eo: Youngs modulus of the outer ring o: Poissons ratio of the outer ring Ea: Youngs modulus of the ball a: Poissons ratio of the ball

2. The deep groove ball bearing according to claim 1, wherein the pitch circle diameter of said bearing is 21 mm or smaller.

3. A deep groove ball bearing comprising: an inner ring; an outer ring; and a plurality of balls located between the inner ring and the outer ring, wherein a pitch circle diameter of said bearing is 21 mm or smaller, and a profile deformation quantity of a raceway groove of the inner ring is 2 m or smaller.

4. The deep groove ball bearing according to claim 3, wherein the pitch circle diameter of said bearing is 5.5 mm to 7.5 mm, and the profile deformation quantity of the raceway groove of the inner ring is 1.5 m or smaller.

5. The deep groove ball bearing according to claim 3, wherein the pitch circle diameter of said bearing is 4.0 mm to 5.5 mm, and the profile deformation quantity of the raceway groove of the inner ring is 1 m or smaller.

6. A bearing device using said deep groove ball bearing as defined in claim 1, wherein said bearing has an internal clearance when said bearing stands alone, and said bearing is assembled into said bearing device while being pre-loaded.

7. A bearing device using said deep groove ball bearing as defined in claim 3, wherein said bearing has an internal clearance when said bearing stands alone, and said bearing is assembled into said bearing device while being pre-loaded.

8. The bearing device according to claim 6, wherein said bearing device is used in the business machine, AV home use device, and HDD device.

9. The bearing device according to claim 7, wherein said bearing device is used in the business machine, AV home use device, and HDD device.