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Variations in the friction coefficient versus R x2 /R x1 with different loads for n i = 1,000 r/min. (A) w = 160 N, (B) w = 360 N, and (C) w = 560 N.
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The roller end/rib contact of tapered roller bearings significantly affects lubricating condition and power loss. To improve the lubrication performance of the inner ring rib and the large end of the roller in tapered roller bearings used in railway coaches, based on the structural analysis of the inner rib and the large end of the roller and consi...
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Citations
... Dormois et al. [16] presented a study of the spinning influence on film thickness and friction in EHL circular contacts under isothermal and fully flooded conditions. Based on the structural analysis of the inner rib and the large end of the roller and considering the spin-slide effects between the rib and the large end of the roller, a thermal elastohydrodynamic lubrication model with a Carreau rheological model was established in a tapered roller bearing [17]. ...
An optical interference test rig with spinning elastohydrodynamic lubrication (EHL) was established to investigate the spinning lubrication performance under different oil-supply conditions. Variations in the shape and thickness of the film versus the velocity, the load, and the spinning factor under fully flooded lubrication were discussed, and the effects of the inlet-starvation position and oil-supply quantity were analyzed. The results show that the symmetry for the classical horseshoe shape does not exist under both spinning–rolling and spinning–sliding EHL conditions. Different from spinning–rolling, a dimple is generated more easily under the spinning–sliding condition. The dimple is related to the load and the speed. The effects of the inlet-starvation position on spinning EHL are different. When the inlet starvation is on the low-speed side of the contact, that is, proximal to the center of rotation, the inlet-starvation position extends from the proximal side to the center of rotation to the distal side to the center of rotation, i.e., the high-speed side of the contact, which is starved easily. When the starvation happens on the high-speed side, i.e., distal to the center of rotation, the starvation at this position becomes much more severe, and lubrication failure and a risk of wear will occur. In addition, the effects of oil-supply quantity on spinning EHL are important.
... Diameter deviation was crucial in determining maximum sliding friction, especially under light loads. Liu et al. (2023) [29] developed a thermal EHL (TEHL) model using a shear-thinning fluid (Carreau model) to analyze TRB geometries. They compared two rib geometries: tapered and spherical, for their coefficient-of-friction (COF) variations. ...
The investigation in this article focuses on the rolling resistance torque and thermal inlet shear factor in tapered roller bearings (TRBs) through systematic experiments using a modular test setup. TRBs typically operate under Elastohydrodynamic Lubrication (EHL) conditions. At sufficiently high speeds, the majority of rolling friction is due to a significant shift of the pressure centre in the EHL contact. While at lower speeds, sliding friction in the roller-rib contact becomes dominant, which operates under mixed lubrication conditions. Limited literature exists on the impact of inlet shear heating on effective lubricant temperature (Tin_c) and rolling friction in TRBs. To fill this gap, experimental measurements of the total frictional torque under axial loading at different speeds and oil temperatures are performed. With existing models for different friction contributions described in the literature, the rolling resistance due to EHL has been determined for various operating conditions. The effects of dimension-less speed (U), material (G), and load (W) parameters have also been investigated. Under fully flooded conditions, it was observed that the influence of material (G) and load (W) parameters on rolling friction is minor, while the impact of velocity (U) is significant. In the context of rolling resistance, the heating due to shear of the lubricant in the inlet zone plays a significant role. For higher rotational velocities, the estimated rotational torque reduction resulting from inlet shear heating was found to be approximately 6–8%.
In order to quantify the relationship between the total frictional heat and the absorbed heat by the oil film in the herringbone gear transmission, this paper investigates the lubrication status and thermal characteristics of the tooth meshing point under the fuel injection condition. Firstly, the contact analysis of the herringbone gears is carried out, studying the variation pattern of the maximum pressure, highest temperature rise, and minimum film thickness of different oil films at various mesh points along the meshing line. Secondly, the friction coefficient and frictional power for the meshing points on the tooth surface are calculated to determine the ratio of oil film pressure to total pressure distribution. This completes the allocation of frictional power for the meshing points of the driving and driven gears. Finally, by comparing the total heat generated by frictional shear with the heat absorbed by the oil film, the numerical relationship between the two can be quantified.
