Relation Among Bearing Preload, Rigidity and Bearing Life

1.      Background

Most customers would like to know the expected rigidity and bearing life before finally choosing TPI bearings. For such circumstances, TPI provides a unique application to evaluate customer' s needs.

Endurance Running-in Test (Duration, Condition, Performance)

1.      Temperature Rise Test

Bearing TypeHS014CE1

Bearing ArrangementDTBT (<< >>)

Rotating Speed10000 RPM

ResultTPI bearings had lower temperature rise rather than the other competitors.

Precision Bearings Application Case Study (2)

1.      Background

Bearing Type7017AD/7015C

Bearing ArrangementDBT/DB (<>> / <>)

Rotating Speed5000 RPM

PhenomenonNoise was found at 4000RPM during running-in test.


Precision Bearings Application Case Study (1)

1.      Background

        Bearing Type7008C/7006C

        Spindle TypeSpindle of honing machine

        Bearing ArrangementDB/DB (<> / <>)

        Rotating Speed6000 RPM

        PhenomenonTemp. rise became over high during running-in test in factory.

Indentations from Particles Causes and Countermeasures
  • How:

    1. Solid contaminants can be introduced into a bearing via the seals or lubricant.
Bearings for spindles with P2 running accuracy
To achieve better manufacturing precision and lower spindle vibration, bearing running accuracy is the key point.
Electrical pitting Causes and Countermeasures
  • How:

    1. Grease isolate the O/R、I/R and ball after uniform distribution in the bearing, but under some circumstance electric potential difference would cumulative, the current force to pass O/R and I/R instantaneous when it reach critical value, cause the spark inside the bearing, make the surface of raceway and rolling elements into molten state, it is electrical pitting.
Fretting Corrosion Causes and Countermeasures
  • Fretting corrosion:

    1. A special wear process that occurs at the contact area between raceways and balls under load or impact and in the presence of repeated relative surface motion load, resulting in lubricant failed (as shown below).
Corrosion cause by varnish and Countermeasures
  • How

    1. When heat and RH are high, the bearing would rust after grease absorb corrosion gas that varnish volatilization inside the motor.

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