Transient analysis of isothermal elastohydrodynamic circular point contacts

Transient elastohydrodynamic point contact analysis using a new coupled differential deflection method Part 2: results

The paper presents results obtained using a transient analysis technique for point contact elastohydrodynamic lubrication (EHL) problems based on a formulation that effectively couples the elastic and hydrodynamic equations. Results are presented for transverse ground surfaces in an elliptical contact that show severe ®lm thinning at the transverse limits of the contact area. This thinning is c...

Elastohydrodynamic Grease Lubrication Theory and Numerical Solution in Line Contacts

In this paper, film thickness and pressure distribution of EHL in line contacts for four kinds of greases and one type of oil are calculated under a series of rolling velocities by wing an inverse solution method. The Herschel-Bulkley model is wed for the rheological characteristics of the grease. Based on the theoretical analysis and numerical calculation, the following influences on film thic...

Transient elastohydrodynamic point contact analysis using a new coupled differential deflection method Part 1: theory and validation

The paper presents a transient analysis technique for point contact elastohydrodynamic (EHL) lubrication problems using coupled elastic and hydrodynamic equations. Full coupling is made possible by use of a novel differential de ̄ection formulation. The way in which the differential de ̄ection is incorporated into the overall solution method for a point contact is discussed. A range of spatial an...

A Transient Mixed Elastohydrodynamic Lubrication Model for Spur Gear Pairs

In this study, a transient, non-Newtonian, mixed elastohydrodynamic lubrication (EHL) model of involute spur gear tooth contacts is proposed. Unlike the contact between two cylindrical rollers, spur gear contacts experience a number of time-varying contact parameters including the normal load, radii of curvature, surface velocities, and slide-toroll ratio. The proposed EHL model is designed to ...

Analysis of thermal conductance of ballistic point contacts