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In case of lightly loaded radial ball bearings, failure mechanisms other than fatigue such as smearing of raceways due to increased frictional torque and vibrations often prevail. Hence, attempts have been made herein for reducing the frictional torque and minimizing the vibrations of a radial deep groove ball bearing employing surface textures at the inner race. Nanosecond pulsed laser was used to create texture (involving micro-dimples having different dimple area density) on the inner race of test bearings. Using an in-house developed test rig, frictional torque and vibrational parameters were measured at different speeds and light loads (i.e. in vicinity of 0.01C, where C is dynamic load capacity of radial ball bearing). Significant reduction in frictional torque and overall vibrations were found in the presence of micro-dimples on inner race at light loads irrespective of operating speeds. Even without satisfying the minimum load needed criteria for the satisfactory operation, substantial reduction in smearing marks was found on the races of textured ball bearings in comparison to conventional cases.


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An exploration of frictional and vibrational behaviors of textured deep groove ball bearing in the vicinity of requisite minimum load

Show Author's information K. E. Ch. VIDYASAGAR1,2R. K. PANDEY3Dinesh KALYANASUNDARAM1,4( )
Center for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
Department of Biomedical Engineering, College of Engineering, Osmania University, Telangana 500007, India
Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
Department of Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India

Abstract

In case of lightly loaded radial ball bearings, failure mechanisms other than fatigue such as smearing of raceways due to increased frictional torque and vibrations often prevail. Hence, attempts have been made herein for reducing the frictional torque and minimizing the vibrations of a radial deep groove ball bearing employing surface textures at the inner race. Nanosecond pulsed laser was used to create texture (involving micro-dimples having different dimple area density) on the inner race of test bearings. Using an in-house developed test rig, frictional torque and vibrational parameters were measured at different speeds and light loads (i.e. in vicinity of 0.01C, where C is dynamic load capacity of radial ball bearing). Significant reduction in frictional torque and overall vibrations were found in the presence of micro-dimples on inner race at light loads irrespective of operating speeds. Even without satisfying the minimum load needed criteria for the satisfactory operation, substantial reduction in smearing marks was found on the races of textured ball bearings in comparison to conventional cases.

Keywords: vibration, ball bearing, textured inner race, grease lubricated, frictional torque

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Publication history

Received: 28 August 2020
Revised: 23 December 2020
Accepted: 22 January 2021
Published: 17 March 2021
Issue date: December 2021

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© The author(s) 2021

Acknowledgements

Authors acknowledge and thank the management of Indian Institute of Technology (IIT) Delhi for allowing to use the various experimental and measuring facilities. Moreover, the first author thanks the management of Osmania University, India, for sponsoring him to pursue his Ph.D. programme at IIT Delhi under quality improvement program (QIP) scheme.

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