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US 6,582,128 B2Granted
Ball bearing and bearing device
AssigneeNsk Ltd.
InventorsYuji Nakano, Shinichi Natsumeda, Yoshiyuki Tsuruga
Life of this patent
Estimating the term…
Abstract
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.
Claims9
A 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 Δi (mm) of a raceway groove of the inner ring and a profile deformation quantity Δo (mm) of a raceway groove of the outer ring are defined by the following equations (1) and (2) Δ i ≦ 36 ( 1 Ei ′ ) 2 ( 1.0003 + 0.5968 Rxi Ryi ) { 1.5227 + 0.6023 ln ( Ryi Rxi ) } Rxi · Ryi Rxi + Ryi wherein 1 Ei ′ = 1 2 ( 1 - vi 2 Ei + 1 - va 2 Ea ) Rxi = Da 2 × dm - Da cos α dm Ryi = ri · Da 2 ri - Da cos α = ri + ro - ( Da + c / 2 ) ri + ro - Da ( 1 ) Δ o ≦ 89 ( 1 Eo ′ ) 2 ( 1.0003 + 0.5968 Rxo Ryo ) { 1.5227 + 0.6023 ln ( Ryo Rxo ) } Rxo · Ryo Rxo + Ryo wherein 1 Eo ′ = 1 2 ( 1 - vo 2 Eo + 1 - va 2 Ea ) Rxo = Da 2 × dm + Da cos α dm Ryo = ro · Da 2 ro - Da cos α = 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:
- Young's modulus of the inner ring
- νi:
- Poisson's ratio of the inner ring
- Eo:
- Young's modulus of the outer ring
- νo:
- Poisson's ratio of the outer ring
- Ea:
- Young's modulus of the ball
- νa:
- Poisson's ratio of the ball.
23 more elements
A 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 μm or smaller.
Dependencies are inferred from the claim text.