Effect of compound pit textures on the friction and wear of thrust cylindrical roller bearings under starved lubrication

Abstract

Purpose This study aims to investigate the effect of compound pit textures on the tribological properties of thrust cylindrical roller bearings (TCRBs) using several parameters, such as compound type, pit diameter, pit depth and pit area density. Design/methodology/approach The surface texture parameters of the shaft washer (WS) raceway include pit diameter (D; 100, 300 and 500 µm), pit depth (H; 10 and 20 µm) and pit area density (S; 10%, 13% and 18%). Pits were produced on the WS of the TCRBs using laser marking equipment. The friction and wear performances of compound pit-textured TCRBs under starved lubrication conditions are studied using a friction and wear test rig. The influence mechanisms of the compound pit texture on the friction and wear properties of TCRBs are discussed through real tests and discussions. Findings Compared with nontextured bearings, the average coefficient of friction (ACOFs) and wear loss of TCRBs with single/compound pit textures are reduced when rotating under starved lubrication. D has the greatest effect on the COFs curve. When D = 300 µm, H = 10 µm and S = 10%, the ACOF and wear loss are the lowest, that is, 0.0207 and 3.38 mg, respectively. Under the same lubrication conditions, compared with the nontextured bearing group, the COF and wear loss are reduced by 41.4 and 59.6%, respectively. Originality/value This study provides a useful reference for the raceways of textured TCRBs.

Effect of Internal Structure of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

“…Seat-shaped bubbles were observed in the cylindrical dimple, whereas finger-shaped bubbles were observed in the spherical and conical dimples. The ratio α was calculated using Formula (13).…”

“…These publications commonly RESEARCH note that the ability of dimples to provide the LCC has a strong influence on the lubrication characteristics. Since the pioneering works by Etsion et al [6], texturing has attracted attention for improving the lubrication performance of machine elements [7][8][9][10][11][12][13][14]. Many researchers attempted to provide optimal designs for fully and partially textured bearings in analysis based on the Reynolds equation or the Navier-Stokes equation [15][16][17].…”

Effect of composite solid lubricant coatings on the tribological performance of thrust cylindrical roller bearings

“…The friction and wear performances of TCRBs were evaluated using an 81107TN friction pair on a friction and wear test rig (MMW-1A, China), as shown in Figure 4. The aim was to investigate the interaction between coatings and solid lubricants under low-speed heavy load conditions (Wang and Zhang, 2022), the selected parameters were as follows: axial loading ¼ 3000 6 100N; rotational speed ¼ 250 RPM; and duration time ¼36,000 s. Wear track profiles were examined with an optical 3 D profiler (VK-1050, KEYENCE, Japan) after the wear test.…”