Analysis of Tapered Roller Bearings Considering High Speed and Combined Loading

1976 ◽  
Vol 98 (4) ◽  
pp. 564-572 ◽  
Author(s):  
J. Y. Liu
Keyword(s):  
High Speed ◽  
Analytical Study ◽  
Roller Bearing ◽  
Combined Loading ◽  
Sliding Velocity ◽  
Friction Forces ◽  
Tapered Roller Bearing ◽  
Rolling Contacts ◽  
Tapered Roller ◽  
Tapered Roller Bearings

This paper presents an analytical study of the load distribution in a tapered roller bearing operating at a high speed and under combined loading. The friction forces at the rolling contacts and the cage forces are not considered. A numerical example showing, among other things, the effects of misalignment and speed on the bearing fatigue life and the sliding velocity at the flange contact is given.

scholarly journals Performance of Computer-Optimized Tapered-Roller Bearings to 2.4 Million DN

1981 ◽  
Vol 103 (1) ◽  
pp. 13-20 ◽  
Author(s):  
R. J. Parker ◽  
S. I. Pinel ◽  
H. R. Signer
Keyword(s):  
Heat Generation ◽  
High Speed ◽  
Roller Bearing ◽  
Inlet Temperature ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Operation Temperature ◽  
Tapered Roller ◽  
High Speed Design ◽  
Tapered Roller Bearings

The performance of 120.65-mm (4.75-in.) bore high-speed design tapered roller bearings was investigated at shaft speeds of 20,000 rpm (2.4 million DN) under combined thrust and radial load. The test bearings design was computer optimized for high-speed operation. Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rates, and lubricant inlet temperature. The high-speed design tapered roller bearing operated successfully at shaft speeds up to 20,000 rpm under heavy thrust and radial loads. Bearing temperatures and heat generation with the high-speed design bearing were significantly less than those of a modified standard bearing tested previously. Cup cooling was effective in decreasing the high cup temperatures to levels equal to the cone temperature.

Simulationsgestütze Auslegung eines Hochdrehzahl-Kegelrollenlagers/Simulation Based Design of a High-Speed Tapered Roller Bearing

Konstruktion ◽  
2017 ◽  
Vol 69 (07-08) ◽  
pp. 83-90
Author(s):  
Christian Brecher ◽  
Marcel Fey ◽  
Alexander Hassis
Keyword(s):  
High Speed ◽  
Roller Bearing ◽  
Tapered Roller Bearing ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Tapered Roller

Inhalt: Übliche Kegelrollenlager zeichnen sich durch eine im Vergleich zu Spindellagern sehr hohe Steifigkeit und Tragfähigkeit aus. Gleichzeitig ist ihre Drehzahleignung deutlich geringer, was den Einsatz in Werkzeugmaschinen-Hauptspindeln zur Fräsbearbeitung in den meisten Fällen ausschließt. Mit dem hier vorgestellten zweistufigen Verfahren wird ein Kegelrollenlager für den Betrieb bei hohen Drehzahlen ausgelegt. Im ersten Schritt erfolgt die Auslegung der Makrogeometrie durch Lösung eines Optimierungsproblems. Zur Auslegung der Mikrogeometrie kommen in zweiten Schritt Methoden zur Kontaktberechnung und -beschreibung zur Anwendung.

Mixed Lubrication and Surface Topography of Rolling Contacts

1974 ◽  
Vol 188 (1) ◽  
pp. 461-469 ◽  
Author(s):  
R. H. Leaver ◽  
R. S. Sayles ◽  
T. R. Thomas
Keyword(s):  
Roller Bearing ◽  
Friction Torque ◽  
Axial Loads ◽  
Metallic Contact ◽  
Tapered Roller Bearing ◽  
Rolling Contacts ◽  
Intermediate Size ◽  
Tapered Roller ◽  
Meaningful Measure

Measurements of friction torque in a tapered roller bearing are made over a range of axial loads at low rotational speeds. Under these conditions considerable metallic contact between surface asperities occurs. Experimental and theoretical values of no-contact time are compared. The usually adopted ratio of calculated film thickness to gross surface r.m.s. value is shown to be a less meaningful measure of the quality of lubrication than one based on the r.m.s. after filtering out contributions due to asperities of wavelength greater than twice the Hertzian width. An analysis of the statistical properties of worn and unworn surfaces is made. Digital filtering of the power spectrum reveals differences that are not apparent in the unfiltered data. Asperities of long and very short wavelengths, compared with the Hertzian width, are shown to be little affected during running-in whilst those of intermediate size are removed.

Fatigue life of tapered roller bearing subject to angular misalignment

2015 ◽  
Vol 230 (2) ◽  
pp. 147-158 ◽  
Author(s):  
Van-Canh Tong ◽  
Seong-Wook Hong
Keyword(s):  
Fatigue Life ◽  
Substantial Reduction ◽  
Roller Bearing ◽  
Loading Conditions ◽  
Angular Misalignment ◽  
Tapered Roller Bearing ◽  
Tapered Roller ◽  
Life Analysis ◽  
Tapered Roller Bearings ◽  
Fatigue Life Analysis

Angular misalignment, defined as the tilted angle between the outer ring and inner ring, is unavoidable in most applications of tapered roller bearings (TBRs) due to many potential causes such as shaft deflection, initial mounting error, bearing geometry inaccuracy, etc. The occurrence of TRB misalignment introduces considerable changes into the contact load and the pressure between rolling elements and the raceways and, thus, greatly influences the bearing life. However, few research results are available on the effects of angular misalignment in TRBs. This paper presents the fatigue life analysis for TRBs with consideration for angular misalignment effects. To this end, a mathematical TRB model is developed to provide a comprehensive fatigue life analysis for TRBs subjected to angular misalignment. The presented model is verified by comparing the estimated fatigue lives under several loading conditions with those from a reference program. Then, the effects of angular misalignment on the fatigue life of TRBs are evaluated systematically. The simulation results show the importance of TRB alignment for the investigated TRB by demonstrating that small amount of angular misalignment leads to a substantial reduction in the fatigue life of the TRB regardless of loading conditions. The results address the necessity of misalignment effects analysis for TRBs.

Statistical Distribution of Tapered Roller Bearing Fatigue Lives at High Levels of Reliability

2005 ◽  
Author(s):  
Michael N. Kotzalas
Keyword(s):  
Weibull Distribution ◽  
Roller Bearing ◽  
Rolling Element Bearing ◽  
Mathematical Methods ◽  
Data Set ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Tapered Roller ◽  
Tapered Roller Bearings ◽  
Two Parameter

The original two-parameter Weibull distribution used for rolling element bearing fatigue tends to greatly underestimate life at high levels of reliability. This fact has been proven for through hardened ball, cylindrical and spherical roller bearings, as well as linear ball bearings, by other researchers. However, to date this has not been done with tapered roller bearings (TRB) or case carburized materials, and as such this study was conducted. First, the three-parameter Weibull distribution was utilized to create a mathematical model, and statistical data analysis methods were put into place. This algorithm was then investigated as to its ability to discern the shape of the reliability distribution using known, numerically generated, data sets for two and three-parameter Weibull distributions. After validation, an experimental data set of 9702 TRB’s, 98% of which were case carburized, was collected. Using the developed algorithm on this data set, the overall RMS error was reduced from 26.0% for the standard, two-parameter to 12.2% for the three-parameter Wiebull distribution. Also, the error at 99.9% reliability was reduced from 95.8% to 37%. However, as the results within varied from previously published values at high reliabilities, there is likely a difference in the underlying population and/or dependency on the statistical and mathematical methods utilized. Therefore, more investigation should be conducted in this area to identify the underlying variables and their effects on the results.

Prediction of Equivalent Radial Loads for Tapered Roller Bearings

1996 ◽  
Vol 118 (3) ◽  
pp. 651-656
Author(s):  
Ted E. Bailey ◽  
Robert W. Frayer
Keyword(s):  
Fatigue Life ◽  
Rolling Contact Fatigue ◽  
Roller Bearing ◽  
Contact Fatigue ◽  
Subsequent Development ◽  
Rolling Contact ◽  
Tapered Roller Bearing ◽  
Applied Loading ◽  
Tapered Roller ◽  
Tapered Roller Bearings

Calculating the fatigue life of a tapered roller bearing has become a rather straightforward exercise thanks to the accumulation of rolling contact fatigue data and the subsequent development of formulation relating applied loading to bearing fatigue life. An integral part of the prediction process is to define an equivalent radial load (EQRL) by combining a bearing’s applied radial and thrust loading into a single entity. This paper reviews currently accepted formulation and offers a potentially more accurate alternative method for estimating the EQRL of a tapered roller bearing than does the current AFBMA standard.

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