Thermal Non-Newtonian EHL Analysis of Rib-Roller End Contact in Tapered Roller Bearings

1995 ◽  
Vol 117 (4) ◽  
pp. 646-654 ◽  
Author(s):  
Xiaofei Jiang ◽  
Pat Lam Wong ◽  
Zhiming Zhang
Keyword(s):  
Film Thickness ◽  
Surface Temperature ◽  
Thermal Effects ◽  
Friction Torque ◽  
Curvature Radius ◽  
Roller Bearings ◽  
Tapered Roller ◽  
Tapered Roller Bearings ◽  
Full Consideration ◽  
Newtonian Behavior

An EHL approach to the rib-roller end contact in tapered roller bearings has been achieved by taking into account the non-Newtonian behavior of lubricants and thermal effects and with full consideration of the peculiar geometrical and kinematic conditions. Two kinds of geometrical configurations of rib and roller end were investigated: tapered rib/spherical roller end and spherical rib/spherical roller end. Optimal ratios of curvature radius of roller end to rib face were deduced. The film thickness, friction torque, lubricant temperature, and surface temperature at various speeds and loads were calculated.

Effects of Defect on Roller-Raceway Contact State and Friction Torque of Tapered Roller Bearings

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
Yuwei Liu ◽  
Wei Kang ◽  
Yongsheng Zhu ◽  
Ke Yan ◽  
Jun Hong
Keyword(s):  
Pressure Distribution ◽  
Contact Pressure ◽  
Friction Torque ◽  
Contact Pressure Distribution ◽  
Contact State ◽  
Rotating Speed ◽  
Roller Bearings ◽  
Pressure Peak ◽  
Tapered Roller ◽  
Tapered Roller Bearings

Abstract The occurrence of defects is unavoidable during the service of tapered roller bearings (TRBs). Unfortunately, there is little information available in the literature about the mechanisms of effects of the defect on roller-raceways’ contact states and friction torque of tapered roller bearings. The present study first analyzed contact states of roller-raceways and roller-flange under the defective condition. A defected TRBs’ model was then established to obtain the contact load and corresponding contact pressure distribution between each roller and raceway, on the basis of which the friction torque of defected TRBs was evaluated. The results show that defects in the raceway edge induce a large contact pressure peak and uneven contact pressure distribution between roller and raceways. The defects presented on the outer raceway will cause a decrease in the friction torque of TRBs, and the decrement of friction torque is related to the external load and rotating speed of TRBs.

scholarly journals Geometrical Optimization of the EHL Roller Face/Rib Contact for Energy Efficiency in Tapered Roller Bearings

Lubricants ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 67
Author(s):  
Sven Wirsching ◽  
Max Marian ◽  
Marcel Bartz ◽  
Thomas Stahl ◽  
Sandro Wartzack
Keyword(s):  
Energy Efficiency ◽  
Carrying Capacity ◽  
Tribological Behavior ◽  
Large Radius ◽  
Load Carrying Capacity ◽  
Statistical Design Of Experiments ◽  
Roller Bearings ◽  
Load Carrying ◽  
Tapered Roller ◽  
Tapered Roller Bearings

In the context of targeted improvements in energy efficiency, secondary rolling bearing contacts are gaining relevance. As such, the elastohydrodynamically lubricated (EHL) roller face/rib contact of tapered roller bearings significantly affects power losses. Consequently, this contribution aimed at numerical optimization of the pairing’s macro-geometric parameters. The latter were sampled by a statistical design of experiments (DoE) and the tribological behavior was predicted by means of EHL contact simulations. For each of the geometric pairings considered, a database was generated. Key target variables such as pressure, lubricant gap and friction were approximated by a meta-model of optimal prognosis (MOP) and optimization was carried out using an evolutionary algorithm (EA). It was shown that the tribological behavior was mainly determined by the basic geometric pairing and the radii while eccentricity was of subordinate role. Furthermore, there was a trade-off between high load carrying capacity and low frictional losses. Thereby, spherical or toroidal geometries on the roller end face featuring a large radius paired with a tapered rib geometry were found to be advantageous in terms of low friction. For larger lubricant film heights and load carrying capacity, spherical or toroidal roller on toroidal rib geometries with medium radii were favorable.

Tandem tapered roller bearings no-load torque loss in a rear axle gear transmission

2021 ◽  
Vol 157 ◽  
pp. 106876
Author(s):  
Justino A.O. Cruz ◽  
Pedro M.T. Marques ◽  
Jorge H.O. Seabra ◽  
Ramiro C. Martins
Keyword(s):  
Rear Axle ◽  
Gear Transmission ◽  
Load Torque ◽  
Roller Bearings ◽  
Torque Loss ◽  
Tapered Roller ◽  
Tapered Roller Bearings

scholarly journals In-Process Measurement for the Process Control of the Real-Time Manufacturing of Tapered Roller Bearings

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1371 ◽  
Author(s):  
Francisco Brosed ◽  
A. Zaera ◽  
Emilio Padilla ◽  
Fernando Cebrián ◽  
Juan Aguilar
Keyword(s):  
Real Time ◽  
Measurement Procedure ◽  
Axial Loads ◽  
Machining Processes ◽  
Process Measurement ◽  
Roller Bearings ◽  
Tapered Roller ◽  
Environmental Process ◽  
Tapered Roller Bearings ◽  
Component Assembly

Tapered roller bearings can accommodate high radial loads as well as high axial loads. The manufacturing process consists of machining processes for ring and component assembly. In this contribution, the parameters of influence on the measurement procedure were studied. These parameters of influence were classified as environmental, process, and machine parameters. The main objective of this work was to optimize the process using real-time measurements, which required the study of the influence of several parameters on the measurement uncertainty and how to correct their effects.

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