Ball_bearing - graph exp b o o x x R x θ-= 1 10 10 a D D r...

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Rolling-Contact Bearings Chapter 11
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Nomenclature
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Classifications Loading Radial Thrust Angular contact Rolling Element Ball Bearing Roller Bearing Cylindrical Spherical Tapered Needle
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Ball Bearings
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Roller Bearings
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Bearing Life Common Measures # of revolutions of the inner ring until the first tangible evidence of fatigue is seen # of hours of use at a standard speed until the first tangible evidence of fatigue is seen • Rating (minimum) life, L 10 Median Life
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Bearing load-life curve 1 . a FL const = 10 3 3, , ball bearings a roller bearings =
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Catalog Load Rating, C 10 F D : actual load L D : desired life L 10 : rated life 1 1 10 10 a a D D C L F L = 1 10 10 a D D L C F L = Note: L is in number of revolutions
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Weibull Distribution Curve fit for right skewed bearing life distribution • Adjustment factor, K r , should be from Weibull distribution analysis; but we will use the following
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Unformatted text preview: graph exp b o o x x R x θ -=- - 1 10 10 a D D r L C F K L = Combined Loading F a : axial thrust F r : radial load F e : eq. radial load V=1 (inner ring rotates) V=1.2 (outer ring rotates) Combined Loading • Table 11-1 1, , e a r r e a a r r r F F e VF VF F F F X Y e VF VF VF = ≤ = + e i r i a F X VF Y F = + Load Application Factor, K a • Like safety factors, increase F e before bearing selection • Table 11-5 1 10 10 a D a e r L C K F K L = Variable Loading . a F L const = 1 . a FL const = ] a a i i e total D F l F l = = ∑ i i total l f l = 1 a a e i ei F f F = ∑...
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This note was uploaded on 10/13/2010 for the course MECH 422 taught by Professor Qian during the Summer '05 term at University of Cincinnati.

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Ball_bearing - graph exp b o o x x R x θ-= 1 10 10 a D D r...

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