..., there is a concern that the transmission efficiency may decrease due to oil churning resistance in the traction portion and the bearings, windage associated with the rollers, and rolling viscous resistance in the traction portion. However, accurate transmission efficiency at high rotational speeds has not been...

... design of experiments surface response methodology root mean square bearings diagnostics rolling rolling-element bearings Rolling bearing assembly is among the notable significant elements of equipment and is essential to the operation of rotating machinery to be adept to support the moving...

... 02 2023 25 04 2023 bearings elastohydrodynamic lubrication films grease lubrication lubricants rolling National Natural Science Foundation of China 10.13039/501100001809 51875298 Natural Science Foundation of Shandong Province 10.13039/501100007129 ZR2019MEE040...

...Ken Takahashi; Takafumi Nagatomo The calculating method for fatigue life of rolling bearings is based on the theory of Lundberg and Palmgren. The rated life is determined from the ratio of the dynamic load rating of the bearing to the dynamic equivalent load. However, in actual applications...

... in the load free zone. For the MC clearance, the polyamide cage showed better behavior (less roller and rolling set slip tendency) than the brass cage contrasting the results obtained earlier under the EC clearance. It is concluded that the polyamide cage deforms under the unsymmetrical loading of the EC...

... of ASME for publication in the J ournal of T ribology . 12 02 2022 25 07 2022 28 07 2022 10 11 2022 bearings rolling rolling element bearings sliding Rolling element bearings are an essential component in mechanical power train systems [ 1 ] to support a shaft...

... lubrication rolling tribological systems Due to increasing demand for reductions in carbon dioxide emissions, many conventional vehicles are expected to be replaced by hybrid, electric, or fuel-cell vehicles. Motor miniaturization is important for reducing vehicle weight and maximizing occupant...

... is practicable. The results indicate that the axial stiffness of the rolling bearing is the lowest among those of the four components, meaning that the axial stiffness of the system is dominant by the rolling bearing. In this case, it is an effective means to improve the axial stiffness of the system...

... for measurement of the power losses of rolling-element bearings. Sets of measurements taken by using the same example ball bearings are compared with those predicted by the model to assess its accuracy in predicting mechanical power loss of a ball bearing within wide ranges of axial and radial forces. Email...

...Zhuang Chen; Guanci Chen The motions between the ball and raceway in a ball bearing involve rolling, gyroscopic, and spin slide. These complex motions result in the serious distribution of the friction force. Based on the contact mechanics in tribology, the friction force greatly affects stress...

.... , Zhang , H. , and Wang , Z. , 2011 , “ Experimental Research on the Dynamic Stiffness of Rolling Guide’s Joint ,” Mach. Des. Manuf. , 49 ( 12 ), pp. 115 – 117 . [5] Kai , Y. , Fukuta , M. , Matsubara , A. , and Kono , D. , 2013 , “ Dynamic Characteristics of Ultra...

...Nguyen Hoa Ngan; Philippe Bocher The objective of this research is to conduct a finite element analysis to better understand the effects of induction hardening on rolling contact fatigue (RCF). The finite element analysis was developed in three-dimensional to estimate the maximal loading...

..., while the ball was made from rubber and the disk was from optical glass. The contact was lubricated by glycerol and polyglycol to examine the effect of fluid viscosity. The measurements were conducted under pure rolling and rolling/sliding conditions. The entrainment speed varied from 10 to 400 mm/s...

... bearings Rolling Seals Wear and leakage increase dramatically when the mechanical seals run under severe conditions. Enhancing the performance of mechanical seals is of great significance to high durability and reliability of modern machines. The approach of designing specific structures...

...Jian Wang; Qingliang Wang; Xiao Zhang; Dekun Zhang The coupled impact and rolling wear behavior of the medium-manganese austenitic steel (Mn8) were studied by comparison with the traditional Hadfield (Mn13) steel. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), and transmission...

... applied to rolling friction control under various external magnetic strengths is conducted. To accomplish this, the rolling friction property of an elastomer on a rigid plate is analyzed. Then, MREs are prepared, and a rolling friction tester is designed to evaluate the changes in the rolling friction...

... for publication in the J OURNAL OF T RIBOLOGY . Manuscript received January 11, 2016; final manuscript received July 18, 2016; published online March 17, 2017. Assoc. Editor: Jordan Liu. 11 01 2016 18 07 2016 Bearing design Contact Elastohydrodynamic lubrication Rolling Tribological...

... are conducted. Tests are performed at low speeds and various loading conditions. Friction sources are decoupled and examined separately in order to fully understand effect of each component on friction torque of the slewing bearing. Therefore, friction caused by rolling motion and friction caused by two...

...Andreas Draganis A theoretical and computational framework for the analysis of fully transient, thermomechanically coupled, frictional rolling contact based on an arbitrary Lagrangian–Eulerian (ALE) kinematical description is presented. In particular, a computationally efficient methodology...

... contacts. In many cases, debris dents appear with shoulders raised above the original surface. Material piling-up this way causes high-pressure spikes when dents are over-rolled by an element such as a ball in a rolling bearing. This study introduces an approximate analytical method based on the so-called...