Date: 2013-08-20

INA bearings friction torque generation

INA Bearing friction torque is good or bad is also a big problem affect bearing operation. Going to tell you now is that these friction torque are influenced by what factors.
INA Bearing these factors in the end is not so big, we are in the end how to look at these factors it? These are how to affect the bearing friction torque.
(1) INA bearing dimensions and ball diameter size: bearing moment formula as follows: a coefficient of friction, P bearing load, bearing diameter, friction torque, and the bearing Dimensions proportional to, and also proportional to the diameter of the balls, because in the same ball and rolling friction case, the larger the ball diameter, the greater the moment arm, the moment of resistance greater.
(2) INA bearing ball diameter and the number of balls: the increase in the number of balls the force is reduced by the ball, the rolling torque is also reduced due to the increase in the number of balls, but at the same time, the increase in sliding friction between the ball and the holder, therefore, the sliding friction torque increases with the number of balls.
(3) groove curvature radius and bearing clearance (or contact angle): increase the radius of curvature of the inner and outer rings ditch, the ferrule and the ball contact area is reduced, the bearing rolling friction torque becomes smaller.
(4) cage structure type: Corrugated and crown-shaped cage smaller torque requirements, but easily scratched due to the crown-shaped cage assembly ball, assembly deformation is difficult to control the ball and the inner ring dual-boot, so the moment dispersed than the wave-type cage large.
(5) Processing: Ring Raceway and balls, the geometry of the roughness, roundness, waviness error moment size. The frictional torque is greatly increased with the decrease of the surface roughness.
(6) Lubricants: the larger the influence of the kind and amount of the lubricant on the frictional torque. Oil lubrication and grease lubrication, viscosity resistance, bearing friction torque can vary several times. Typically, the viscosity of the lubricant at a low temperature is large, so the period of cold starting friction torque to be larger.
(7) load and speed: torque requirements of INA bearings typically used for load occasions, radial load, the greater the average friction torque. The higher the speed of the bearing, the friction torque greater.

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