Investigation of friction and vibration performance of lithium complex grease containing nano-particles on rolling bearing

Soliman²,

et al. 2022

Lubricants

In recent years, reduced graphene oxide (rGO) received considerable interest as a lubricant nano-additive for enhancing sliding and rolling contacts. This paper investigates the tribological and dynamic behavior of ball bearings lubricated by lithium grease at different weight percentages of rGO. Full bearing tests were conducted for experimental modal analysis, vibration analysis, ultrasonic analysis, and infrared thermography. Modal analysis indicated considerable improvements of the damping ratio values up to 50% for the bearings with rGO nano-additives. These findings were confirmed by the corresponding reductions in vibrations and ultrasound levels. The steady-state temperatures of bearings running with lithium grease reached 64 °C, whereas the temperature of bearings lubricated by grease with 2 wt.% rGO measured only 27 °C. A Timken Load test was conducted on grease samples with and without rGO additives. Grease samples having 2, 3.5, and 5 wt.% rGO showed the highest OK load with an increase of 25%, 50%, and 100% as compared to values of lithium grease. For comparison, all tests were conducted on samples of the same grease blended with graphite and MWCNTs’ nano-additives. The results proved the superiority of graphene in enhancing the load-carrying capacity and damping of grease in rolling bearings.

Section: Vibration Analysis Resultsmentioning

confidence: 97%

Impact of Graphene Nano-Additives to Lithium Grease on the Dynamic and Tribological Behavior of Rolling Bearings

Soliman²,

et al. 2022

Lubricants

“…Lubrication additives can also be obtained by modifying Zn/ZnO (zinc dialkyl dithiophosphates, ZDDP) [88][89][90][91][92][93][94]. Wu et al [95] synthesized lithium complex grease (LCG) added with carbon black (C), Fe 3 O 4 , and Al 2 O 3 nanoparticles on rolling bearing and found that nanoparticles were beneficial to enhance the friction and wear performance (see Fig. 7).…”

Section: Lubricant Additivesmentioning

confidence: 99%

A review of advances in tribology in 2020–2021

Meng

et al. 2022

Friction

Around 1,000 peer-reviewed papers were selected from 3,450 articles published during 2020–2021, and reviewed as the representative advances in tribology research worldwide. The survey highlights the development in lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology, providing a show window of the achievements of recent fundamental and application researches in the field of tribology.

Proceedings of the Institution of Mechanical Engineers, Part C:

“…Attempts have been made by the researchers for achieving the effective lubrication by employing surface textures/micro-grooves on the bearing races, [4][5][6][7][8][12][13][14][15] holes and circumferentially micro-grooves on balls 16 and adding certain nano/micro particles in the lubricants. [17][18][19][20][21][22] Significant reductions in frictional torque, rise in temperature and vibration level are found with textured races of ball bearings. [4][5][6][7][8]12,15 Microhelical grooves 13 and surface textures involving dimples 14 have been created in circumferentially direction on the inner and outer races in the vicinity of contacts formed between races and balls to increase the lubricant retainability and consequently to improve the performance behaviors.…”

Section: Introductionmentioning

confidence: 99%

“…Rolling elements have also been made as carrier of lubricant by machining the shallow grooves on the balls’ surfaces and through holes in it. 16 Lubricants containing the particles of MoS 2 , 17,18 Carbon black/Fe 3 O 4 /Al 2 O 3 , 19 and nano flakes 20 have been used to explore and improve bearing life, reduce vibration and frictional torque. Nano-flakes have been used to improve the performance of ball bearings and by employing grease blended with MoS 2 , WS 2 , and hBN significant improvement in frictional torque, rise in temperature, and vibration up to 33%, 23%, and 64% respectively have been obtained.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of a radial ball bearing using a micro-groove on stationary outer race

Gouda

Tandon

Pandey

et al. 2022

For achieving improved lubrication in a radial ball bearing (BB1B 420206), a circumferential micro-groove inside the stationary outer race has been conceived based on finite element analysis to facilitate the availability of grease and to reduce the stresses at the contacts and it has been fabricated to conduct the experiments. To understand the effect of this micro-groove filled with grease on the film formation, frictional torque, and bearing dynamics, experiments were performed for measuring these variables at different operating parameters ( pH = 0.35–1.2 GPa; speed = 1.4–4.2 m/s). Capacitance based approach, load cell, and miniature accelerometer have been employed to measure the film thickness, frictional load and vibrations, respectively. The results achieved with bearings with micro-groove on outer races have been compared with bearings having the conventional races at the identical operating parameters. Reductions of 14%–41% in vibrations, up to 11.2% increase in film thickness (i.e. 11% reduction in the capacitance), and in the range of 15%–30% reduction in the frictional torque have been obtained as compared to conventional bearing cases.