Monthly Archives: Feb 2019

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White Paper 4 – Speed of Bearings

Speed of Bearings

  • Limiting Speed of Bearings

 The rotation of the rolling bearings is limited to certain limits. During operating condition the increase in speed of the bearing also led to the increase of temperature because of the friction. The maximum speed at which bearing can be operated continuously without failure and excessive heat generation, such speed can be determined by the formula called as limiting speed of the bearings. The factors which affect the limiting speed of the bearings are, bearing type and size, cage form and material, applied load, lubrication method, and heat dissipation method including design of the bearing’s surroundings.

The limiting speeds can be given as C/P ≥ 12.5 and Fa /Fr ≤ 0.25 for the bearings of standard design and subjected to normal loads.

Different lubricants are used for different operating speed. Lubricants used for the high speed have different characteristics. When the limiting speeds increases to more than 70 % of the bearing limiting speed special type of oil or lubricants should be used, else contact NIBL.

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White Paper – Speed of Bearings

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White Paper 3 – Friction in Bearings

Friction in Bearings

Rolling bearings are called anti-friction bearing. They have high loading capacity and exhibit very low rolling friction torques.   The friction torques are similar or lower than ideally designed plain bearing operating under conditions of thick film lubrication.  Rolling bearing has low starting torques.

  • Friction component and influence factor

 

The idling friction is depends on the quantity of lubricant, operating speed, viscosity of lubricant during operation, seal and operating conditions in which bearing is running.

The bearing friction torque Mr = F. f. (d/2) or

The bearing friction torque Mr = F. fm. (Dm/2)

  • Mr = Friction torque (N mm)
  • F = Radial (or axial load) (N)
  • f = coefficient of friction of rolling bearing.
  • fm = coefficient of friction of rolling bearing based on mean diameter
  • d = Diameter of the bore of the bearing (Shaft diameter)(mm)
  • D = Outside diameter of the bearing (mm)
  • Dm = (d+D)/2 (mm)

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White Paper – Friction in Bearings

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