Observation of Lubricant Replenishment under Cyclic Loading

doi:10.3901/JME.2024.03.203

Abstract

Abstract: Using the ball-on-disc single contact optical thin film measurement apparatus, the lubricant replenishment and lubrication states under cyclic loading are observed. The results show that if the rolling element running distance in the loading/unloading process is larger than the circumference of the track, the instant contact width will be inconstant with the existing track width. In consequence, the lubrication state in the loading process is better to some extent than that of the unloading case. Moreover, the lubrication state under cyclic loading is superior to the steady case, mainly due to the lubricant replenishment under capillary and surface tension effects. The lubricant replenishment can be improved due to an increase in the contact radius variation gradient, causing the film thickness to rebound at the end of unloading.

Key words: cyclic loading, lubrication replenishment, lubrication state, starvation, optical interferometry

CLC Number:

TH117

JIN Xuyang, LI Xinming, LIU Yao, YANG Ping, GUO Feng, GAO Junbin. Observation of Lubricant Replenishment under Cyclic Loading[J]. Journal of Mechanical Engineering, 2024, 60(3): 203-213.

References

[1] LIANG H, GUO D, LUO J. Experimental investigation of lubrication film starvation of polyalphaolef in oil at high speeds[J]. Tribology Letters, 2014, 56(3):491-500.
[2] WIKSTRÖM V, HÖGLUND E. Starting and steady-state friction torque of grease-lubricated rolling element bearings at low temperatures-Part I:A parameter study[J]. Tribology Transactions, 1996, 39(3):517-526.
[3] LI X M, GUO F, POLL G, et al. On the grease film evolution in rolling EHL contacts[J]. Friction, 2021, 9(1):179-190.
[4] POLL G, LI X M, BADER N, et al. Starved lubrication in rolling contacts-A Review[J]. Bearing World Journal, 2019, 4:69-81.
[5] LI X M, GUO F, WONG P L, et al. Regulation of lubricant supply by wettability gradient in rolling EHL contacts[J]. Tribology International, 2018, 120:565-574.
[6] LIU C L, GUO F, WONG P L, et al. Tribological behaviour of surfaces with stepped wettability under limited lubricant supply[J]. Tribology International, 2020, 141:105880.
[7] 李哲,刘成龙,李超,等.条状润湿表面对面接触限量润滑油膜的影响研究[J].摩擦学学报, 2020, 40(5):601-607. LI Zhe, LIU Chenglong, LI Chao, et al. Influence of strip-shaped wet surface on lubrication films in slider-on-disc conformal contact under limited lubricant supply[J]. Tribology, 2020, 40(5):601-607.
[8] 韩露娟,郭峰,栗心明,等.硬脂酸界面修饰对油膜润滑影响的试验研究[J].机械工程学报, 2022, 58(9):182-189. HAN Lujuan, GUO Feng, LI Xinming, et al. Effect of interface modification of stearic acid on oil film lubrication[J]. Journal of Mechanical Engineering, 2022, 58(9):182-189.
[9] LIU C L, GUO F, WONG P L, et al. Laser pattern-induced unidirectional lubricant flow for lubrication track replenishment[J]. Friction, 2021, 10:1234-1244.
[10] 李书义,郭峰,栗心明.弹流接触单液滴润滑特性分析[J].机械工程学报, 2018, 54(3):95-100. LI Shuyi, GUO Feng, LI Xinming. Analysis of lubrication characteristic of single droplet in the elastohydrodynamic lubrication contact[J]. Journal of Mechanical Engineering, 2018, 54(3):95-100.
[11] FISCHER D, GOELDEL S V, JACOBS G, et al. Numerical investigation of effects on replenishment in rolling point contacts using CFD simulations[J]. Tribology International, 2021, 157(2):106858.
[12] 刘文哲,栗心明,金旭阳,等.定量供油下近接触区油池形态试验观察[J].摩擦学学报, 2022, 42(3):532-540. LIU Wenzhe, LI Xinming, JIN Xuyang, et al. Observation of near-contact oil reservoir patterns under single-charging amount[J]. Tribology, 2022, 42(3):532-540.
[13] 刘文哲,栗心明,杨萍,等.定量定时供油方式下润滑剂分布及润滑状态试验观察[J/OL].(2022-03-07).摩擦学学报, 2022. https://kns.cnki.net/kcms/detail/62.1095. O₄.20220303.2011.002.html. LIU Wenzhe, LI Xinming, YANG Ping, et al. Observation of lubricant distribution and lubrication state under regular and quantitative oil supply[J/OL].(2022-03-07). Tribology, 2022. https://kns.cnki.net/kcms/detail/62.1095. O₄.20220303.2011.002.html.
[14] 栗心明,周广运,郭峰,等.异向卷吸作用下润滑剂回填增强效应试验研究[J].机械工程学报, 2020, 56(17):225-232. LI Xinming, ZHOU Guangyun, GUO Feng, et al. Experimental investigation into enhancement of lubricant replenishment induce by angled entrainment[J]. Journal of Mechanical Engineering, 2020, 56(17):225-232.
[15] 周广运,栗心明,郭峰,等.表面速度异向条件下定量脂润滑特性试验观察[J].摩擦学学报, 2019, 39(5):635-642. ZHOU Guangyun, LI Xinming, GUO Feng, et al. Experimental observation of single-charging grease lubrication with different directions of surface motion[J]. Tribology, 2019, 39(5):635-642.
[16] 江楠,栗心明,杨萍,等.滑滚条件下定量润滑状态与润滑剂回填效应试验观察[J].摩擦学学报, 2021, 41(1):9-16. JIANG Nan, LI Xinming, YANG Ping, et al. Observation of lubrication state and lubricant replenishment under sliding-rolling motions with single-charging amount[J]. Tribology, 2021, 41(1):9-16.
[17] 李桂枝,白清华,栗心明,等.定量供油下球-环/球-盘接触形式润滑特性对比[J].摩擦学学报, 2022, 42(4):700-708. LI Guizhi, BAI Qinghua, LI Xinming, et al. Comparison of lubrication characteristics of ball-on-ring/ball-on-disk contact form[J]. Tribology, 2022, 42(4):700-708.
[18] 刘海超,郭峰,赵国磊.润滑膜厚测量的双色光干涉强度调制方法[J].摩擦学学报, 2015, 35(3):282-287. LIU Haichao, GUO Feng, ZHAO Guolei. A dichromatic interference intensity modulation approach to lubricating film thickness measurement[J]. Tribology, 2015, 35(3):282-287.
[19] WEDEVEN L, EVANS D, CAMERON A. Optical analysis of ball bearing starvation[J]. ASME Journal of Tribology, 1971, 93:349-363.
[20] ZHU D, WEN S Z. A full numerical solution for the thermoelastohydrodynamic problem in elliptical contacts[J]. ASME Journal of Tribology, 1984, 106(2):246-254.
[21] DAMIENS B, LUBRECHT A, CANN P M E. Lubrication regimes in rolling element bearings[J]. Tribology and Interface Engineering Series, 2001, 39:295-301.