VDMA Verlag

Bearing World Journal 2019


Herunterladen
vom 24.02.2020

D. Bechev et al.: Method for the investigation of the EDM breakdown voltage of grease and oil

Method for the investigation of the EDM breakdown voltage of grease and oil on rolling bearings
Rolling bearing currents cause damage both to the bearing and to the lubricant contained therein. To prevent such damage, the influence of the lubricant in the bearing is becoming increasingly important. By analys- ing the discharge currents and the breakdown voltage in rolling bearings with lubricants of different composition, knowledge of the electrical behaviour of the system (bearing and lubricat

EDM, breakdown voltage, bearing currents


Herunterladen
vom 24.02.2020

G. Poll et al.: Starved Lubrication in Rolling Contacts-A Review

Starvation is frequently encountered in rolling element bearings. The occurrence of starvation inhibits the generation of pressure and hence results in reduction in film thickness. On the other hand, starvation is helpful to suppress rolling friction and gross skidding of rolling bearings. ...

starvation, rolling contacts, elastohydrodynamic lubrication, grease lubrication, replenishment


Herunterladen
vom 24.02.2020

M.Y. Sherif et al.: A new through-hardenable high hardenability bearing steel

A new through-hardenable high hardenability bearing steel designed by means of simultaneous optimisation of multiple responses using the desirability function approach

The current work presents a thermodynamics-based approach where the bearing steel alloy design was carried out such that several requirements, for instance high as-quenched hardness and minimum pearlite fraction, were optimised at once making use of inputs like a varying concentration of an alloying element. ...

Alloy design, desirability function, bearing steel, large size bearings


Herunterladen
vom 24.02.2020

L. Houpert: Novel analytical and numerical calculations in truncated point contact

Novel relationships are given for calculating the contact load, tilting moment and pressure distribution along the roller as a function of the contact deformation and tilting angle for non-truncated or truncated point contacts described using single crown profiles. The analytical results have been calibrated versus some numerical results obtained using a cylinder on cylinder case and an advanced model and tool that account for pressure spikes. ...

Hertzian point contact, truncated point contact, contact pressure, pressure spikes


Herunterladen
vom 24.02.2020

W. Ma et als: Numerical solution and FFT-based prediction of the hydrodynamic pressure generation

Numerical solution and FFT-based prediction of the hydrodynamic pressure generation of parallel rough surfaces
In general, the component macro-geometry (radius of curvature) determines the pressure generation and the roughness alters it somewhat. However, for parallel surfaces, the surface micro-geometry completely determines the hydrodynamic lubrication. This paper extends earlier work to numerically solve the hydrodynamic pressure generation and load carrying capacity (LCC) of surfaces ...

hydrodynamic lubrication, parallel surfaces, load carrying capacity, FFT techniques


Herunterladen
vom 24.02.2020

M. Stammler et al.: The influence of oscillation sequences on rolling bearing wear

Oscillating applications for rolling bearings include construction machinery like cranes and excavators and wind turbine pitch and yaw bearings. Due to the widespread use and the specific challenges of wind energy, oscillating applications have gained increased attention by the scientific community in the last years. In wind turbines, the amplitudes, their mean values and external loads of oscillations vary. ...

wear, oscillation, rolling bearings, pitch bearings


Herunterladen
vom 24.02.2020

S. Rizzo et al.: Dimensional stability on Fatigue Performance of Wheel Bearing Rolling Elements

Rolling bearings are critical automotive and mechanical components. For high loaded bearings, the steel rolling elements are subjected to failure having a direct impact on overall bearing fatigue life performance. Fatigue phenomena involve both rolling contact fatigue and material fatigue damage processes. ...

Bearing, RCF, Rolling elements, Dimensional stability


Herunterladen
vom 24.02.2020

T. Klenk et al.: Conductive Simmerrings

Conductive Simmerrings help prevent electrical discharge machining in modern electrical powertrains
Electric motors used in e-mobility place completely new requirements on the radial shaft seals, Simmerrings, used in these applications. In the past, research and development work has focused on reducing friction in combustion engines and driveline systems in combination with increasingly higher performance lubricants. ...

EDM electrical discharge machining, conductive nonwovens, bearing damage, impedance spectroscopy, EMI electromagnetic interference