...Yuko Higashitani; Sanemasa Kawabata; Marcus Björling; Andreas Almqvist In many mechanical systems, elastohydrodynamic lubrication (EHL) is apparent in the interfaces between rolling/sliding parts. Even at small slide-to-roll ratios, detailed knowledge about the oil film thickness and the traction...

... 2024 Graphical Abstract Figure smart lubricants soft-EHL core traction film thickness rheology The characteristics of a lubricated interface are notably influenced by the viscosity of the lubricant and its response to variations in shear rate, temperature, and pressure...

..., this study employs a validated explicit finite element (FE) method to evaluate the transient wheel-rail rolling/slipping contact behaviors. The contact during the traction of the wheel from both standstill status and moving status is focused. Friction and traction coefficients are the two most crucial...

.... 29 05 2013 24 11 2013 This paper addresses a largely ignored aspect pertaining to the elastohydrodynamic lubrication (EHL) traction behavior of fragile lubricants which undergo transition to glassy state at typical EHL contact zone pressures. For such lubricants, a conventional EHL...

... elastohydrodynamic lubrication point contact spinning film thickness traction non-Newtonian behavior complex kinematics shear stress distribution In numerous mechanical systems, for instance in the flange-roller end contacts in roller bearings or in variable traction drive systems, a spinning motion...

... complete rotation of the spirally grooved roller, the traction coefficient between the web and the roller changes with time due to the changing shape of the groove in the contact region, and the average traction coefficient of the circumferentially grooved roller is higher than that of the spirally grooved...

...Punit Kumar; M. M. Khonsari This paper investigates the traction behavior in heavily loaded thermo-elastohydrodynamic lubrication (EHL) line contacts using the Doolittle free-volume equation, which closely represents the experimental viscosity-pressure-temperature relationship and has recently...

... the predicted and measured results. The validity of the formula for the first-order estimation of web-roller interface problems is verified experimentally. 25 02 2004 06 10 2005 rollers (machinery) traction polymers thin films permeability manufacturing systems Continuous flexible...

...Yasuyoshi Tozaki; Akihiko Umeda; Hiroyuki Sonobe; Susumu Matsumoto; Takeshi Yoshimi; Isamu Shiotsu Traction drive makes oil film between two rollers, and power is transmitted by oil film shearing. It has the following characteristics. (1) Traction drive can be operated at low level of vibration...

... (structures) steel lubrication heat transfer traction flash temperatures heat partition non-Newtonian EHL limiting shear stress The prediction of temperatures in lubricated rolling/sliding elastohydrodynamic (EHL) contacts, such as those found between the teeth of gears...

...Brian S. Rice; Roger F. Gans, Member, ASME We studied the traction developed between a thin, flexible web and a rotating circumferentially grooved cylindrical roller. We have developed a new two-dimensional analytic model that couples air film pressure, web deflection, and asperity contact...

...Sinan Mu¨ftu¨, Associate Professor, Mem. ASME; John J. Jagodnik, Graduate Student Web traction over rollers is known to deteriorate due to air entrainment at high web speeds. In this paper, a general model is presented to predict the traction capability of an impermeable web over a smooth roller...

... force, Q , is large, the shear tractions are positive throughout. This shear traction distribution at the contact surface can be evaluated, as described by Mindlin 2 , by expressing the shear traction as the superposition of two shear tractions, q ′ and q ″ . (21) q X...

...K. J. Sharif; H. P. Evans; R. W. Snidle; J. P. Newall The paper describes the application of a full non-Newtonian, thermal elastohydrodynamic lubrication (EHL) model for the prediction of film thickness and viscous traction force in a special high speed rolling traction rig. The primary objective...

...Brian S. Rice; Kevin A. Cole; Sinan Mu¨ftu¨ The traction developed between a thin flexible web, wrapped around a non-vented, rotating cylindrical roller is studied experimentally and theoretically. A series of eight webs representing a wide range of surface roughness characteristics are traction...

...Xiaolan Ai A novel design of planetary tapered roller traction drive was described. The design eliminated the spin motion induced sliding, offering high mechanical efficiency and improved wear performance. Principles of performance calculation have been outlined. Torque and life calculations...

...Xiaolan Ai A tapered roller planetary traction drive based on a so-called zero-spin design was built for performance evaluation. The traction drive demonstrated, in many aspects, superb performance characteristics. The zero-spin design increased the torque capacity and enabled the traction drive...

...K. S. Ducotey; J. K. Good Air entrainment can become a significant problem in a web handling process line. The development of an air film between a roller and web can cause a reduction in traction. This can cause a velocity difference between the web and roller and may also cause guiding problems...

... frictional sliding with given values of the friction coefficient, materials constants, and sliding velocity, the dependence of the contact zone length on the remotely applied tractions is determined. The results indicate a decrease of the minimum applied traction required to close the gap between the bodies...

... system is solved using a modified Newton-Raphson algorithm. The traction characteristics of the web are presented for different porosity levels, asperity height, and compliance. [S0742-4787(99)00102-8] Contributed by the Tribology Division for publication in the JOURNAL OF TRIBOLOGY . Manuscript...