The Effect of Outer Ring Distortion on Wheel Bearing Friction Torque

2017 ◽  
Vol 10 (3) ◽  
pp. 786-790 ◽  
Author(s):  
Stacey Scherer
Keyword(s):  
Friction Torque ◽  
Outer Ring ◽  
Ring Distortion ◽  
Bearing Friction ◽  
Wheel Bearing

scholarly journals Bearing friction effect on cup anemometer performance modelling

2021 ◽  
Vol 2090 (1) ◽  
pp. 012101
Author(s):  
D Alfonso-Corcuera ◽  
S. Pindado ◽  
M Ogueta-Gutiérrez ◽  
A Sanz-Andrés
Keyword(s):  
Rotation Rate ◽  
Aerodynamic Drag ◽  
Aerodynamic Characteristics ◽  
Friction Torque ◽  
Performance Modelling ◽  
Friction Forces ◽  
Aerodynamic Drag Coefficient ◽  
Yaw Angle ◽  
Cup Anemometer ◽  
Bearing Friction

Abstract In the present work, the effect of the friction forces at bearings on cup anemometer performance is studied. The study is based on the classical analytical approach to cup anemometer performance (2-cup model), used in the analysis by Schrenk (1929) and Wyngaard (1981). The friction torque dependence on temperature was modelled using exponential functions fitted to the experimental results from RISØ report #1348 by Pedersen (2003). Results indicate a logical poorer performance (in terms of a lower rotation speed at the same wind velocity), with an increase of the friction. However, this decrease of the performance is affected by the aerodynamic characteristics of the cups. More precisely, results indicate that the effect of the friction is modified depending on the ratio between the maximum value of the aerodynamic drag coefficient (at 0° yaw angle) and the minimum one (at 180° yaw angle). This reveals as a possible way to increase the efficiency of the cup anemometer rotors. Besides, if the friction torque is included in the equations, a noticeable deviation of the rotation rate (0.5-1% with regard to the expected rotation rate without considering friction) is found for low temperatures.

Bearing Friction Vs. Chain Friction for Chain Drives

2013 ◽  
Vol 753-755 ◽  
pp. 1110-1113 ◽  
Author(s):  
Alina Todi-Eftimie ◽  
Radu Velicu ◽  
Radu Saulescu ◽  
Codruta Jaliu
Keyword(s):  
Internal Combustion Engine ◽  
Relative Motion ◽  
Critical Analysis ◽  
Combustion Engine ◽  
Experimental Methods ◽  
Friction Torque ◽  
Chain Transmission ◽  
A Chain ◽  
Chain Drives ◽  
Bearing Friction

This paper studies experimental methods to measure friction, which determines the wear of chain elements in relative motion from a chain transmission, used in camshaft drives for an internal combustion engine. The paper presents a critical analysis of a constructive solution realized to determine the friction torque in parallel axes transmission bearings.

Formulation of Bearing Friction Torque in Threaded Joints With Nonflat Contact

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Marco Gerini Romagnoli ◽  
Sayed A. Nassar ◽  
Joon Ha Lee
Keyword(s):  
Friction Coefficient ◽  
Contact Pressure ◽  
Test Data ◽  
Contact Geometry ◽  
Friction Torque ◽  
Tension Test ◽  
Two Dimensional ◽  
Pressure Data ◽  
Threaded Joints ◽  
Bearing Friction

Abstract A novel experimentally validated formulation is provided for the bearing friction torque component in threaded joints with spherical and conical contact geometry, by extending two-dimensional Motosh model for various scenarios of contact pressure. Data for the corresponding effective bearing friction radius is generated, using constant or sliding speed-dependent friction coefficient models. Generated bearing friction radius data are used in Motosh model for torque–tension test data to obtain the bearing friction coefficient, which is found to be reasonably comparable to published bearing friction data.

Poor Information Analysis of Rolling Bearing Friction Torque Characteristic Parameter Based on Phase Space

2011 ◽  
Vol 382 ◽  
pp. 167-171
Author(s):  
Lei Lei Gao ◽  
Xin Tao Xia
Keyword(s):  
Time Series ◽  
Phase Space ◽  
Characteristic Parameter ◽  
Rolling Bearing ◽  
Friction Torque ◽  
Point Estimation ◽  
Experimental Result ◽  
Bayesian Probability ◽  
Characteristic Parameters ◽  
Bearing Friction

The friction torque of rolling bearings belongs to an information poor system with unknown probability distributions and trends. This counteracts dynamical assessment for the characteristics of the rolling bearing friction torque as a time series. For this reason, the chaos theory is employed to recover the original dynamic characteristics of a friction torque time series by means of the phase space reconstruction theory. The dynamical Bayesian probability density function of the characteristic parameters of the friction torque is constructed by the information poor theory based on the phase space. The method for point estimation, interval estimation, and trend estimation of the characteristic parameters is proposed in this paper. The investigation shows that the error between the calculated result and the experimental result is very small.

Evaluating Thermal Performance of a PTFE-Faced Tilting Pad Thrust Bearing

2003 ◽  
Vol 125 (2) ◽  
pp. 319-324 ◽  
Author(s):  
Sergei B. Glavatskih
Keyword(s):  
Thrust Bearing ◽  
Friction Torque ◽  
Outer Diameter ◽  
Test Results ◽  
Operating Characteristics ◽  
Thrust Bearings ◽  
Ptfe Composite ◽  
Temperature Distributions ◽  
Tilting Pad ◽  
Bearing Friction

This paper compares and analyses operating characteristics of equalizing tilting pad thrust bearings with babbitt and polytetrafluoroethylene (PTFE) composite facings. Each bearing arrangement included six pads with an outer diameter of 228.6 mm and 60 percent offset. The babbitted bearing was typical of design in general use. A PTFE composite was applied instead of the babbitt to a similar bearing. Bearings were tested at different load-speed combinations in the fully flooded mode. Pad temperature distributions, collar temperatures and bearing friction torque were continuously measured. Test results show that the PTFE composite provides excellent thermal insulation so that pad thermal crowning is eliminated. PTFE-faced bearings operate with lower power loss and slightly higher collar temperatures compared to similar babbitted bearings.

Bearing Friction Torque in Bolted Joints

2005 ◽  
Vol 48 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Sayed A. Nassar ◽  
G. C. Barber ◽  
Dajun Zuo
Keyword(s):  
Friction Torque ◽  
Bolted Joints ◽  
Bearing Friction

Distortion Analysis for Outer Ring of Automotive Wheel Bearing

2012 ◽  
Vol 36 (12) ◽  
pp. 1613-1618 ◽  
Author(s):  
Seung Pyo Lee ◽  
Bong Chul Kim ◽  
In Ha Lee ◽  
Young Geol Cho ◽  
Yong Chan Kim
Keyword(s):  
Outer Ring ◽  
Distortion Analysis ◽  
Wheel Bearing

Bearing Friction Torque in Threaded Fasteners With Non-Flat Underhead Contact

2018 ◽  
Author(s):  
Sayed A. Nassar ◽  
Marco Gerini Romagnoli ◽  
Joon Ha Lee
Keyword(s):  
Friction Coefficient ◽  
Contact Pressure ◽  
Friction Torque ◽  
Sliding Speed ◽  
Friction Coefficients ◽  
Threaded Fasteners ◽  
Tension Testing ◽  
Contact Surfaces ◽  
Flat Contact ◽  
Bearing Friction

This study provides experimentally validated formulation of underhead bearing friction torque component during tightening of threaded fasteners with non-flat contact with the joint. Motosh model is utilized for spherical and conical contact surfaces for various scenarios of contact pressure. For each pressure scenario, a single non-dimensional 3-D graph is generated for the corresponding values of an effective bearing friction radius. A rotating sliding speed-dependent friction coefficient model is also investigated for its impact of the results of bearing friction radius. Torque-Tension testing is used to measure the bearing friction torque and the corresponding bearing friction coefficients using Motosh model, in which the newly formulated bearing friction radius expressions are entered. Obtained bearing friction coefficient values are then compared with those published by the threaded fastener manufacturer.

Gray Chaos Evaluation Model for Prediction of Rolling Bearing Friction Torque

2010 ◽  
Vol 38 (3) ◽  
pp. 102623 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Xia Xintao ◽  
Lv Taomei ◽  
Meng Fannian
Keyword(s):  
Evaluation Model ◽  
Rolling Bearing ◽  
Friction Torque ◽  
Bearing Friction
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