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Table 2

Test conditions.

Ball and roller material Martensitic Steel ANSI 52100
Roller diameter 18 mm Applied load 35 kN
Roller length 26 mm Maximum Hertz contact stress 5.3 GPa
Roller hardness 62 HRC Roller rotating speed 4100 rpm
Roller surface roughens Ra 0.08 µm Lubricant Shell Turbo 32, mineral oil
Ball diameter 20 mm Lubrication method Circulation, stirring in the oil bath
Ball hardness 58–62 HRC Oil temperature 48±1 °C (outer ring)
Ball surface roughens Ra 0.02 µm Lubricant film thickness 0.209 µm
Lubrication parameter λ = 3, kappa∼2.5 (EHL full film) Maximum testing period 200 h

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