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.

scholarly journals Lubrication of High-Speed, Large Bore Tapered-Roller Bearings

1978 ◽  
Vol 100 (1) ◽  
pp. 31-38 ◽  
Author(s):  
R. J. Parker ◽  
H. R. Signer
Keyword(s):  
Flow Rate ◽  
Power Loss ◽  
High Speed ◽  
Roller Bearing ◽  
Inlet Temperature ◽  
Shaft Speed ◽  
Roller Bearings ◽  
Lubricant Flow ◽  
Tapered Roller ◽  
Tapered Roller Bearings

The performance of 120.65-mm- (4.75-in.-) bore tapered-roller bearings was investigated at shaft speeds up to 15,000 rpm (1.81 × 106 DN). Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rate, and lubricant inlet temperature. Lubricant was supplied either by jets or by a combination of holes through the cone directly to the cone-rib contact and jets at the roller small-end side. Cone-rib lubrication significantly improved high-speed tapered-roller bearing performance, yielding lower cone-face temperatures and lower power loss and allowing lower lubricant flow rates for a given speed condition. Bearing temperatures increased with increased shaft speed and decreased with increased lubricant flow rate. Bearing power loss increased with increased shaft speed and increased lubricant flow rate.

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.

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.

Finite Element Analysis of Cartridge Tapered Roller Bearing of Freight Wagon

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
Parbant Singh ◽  
S.P. Harsha
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Roller Bearing ◽  
Element Analysis ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Standard Design ◽  
Rail Industry ◽  
Tapered Roller ◽  
Tapered Roller Bearings

Freight trains run under high service loads during consignment loading and operation so tapered roller bearings are ideally suited to wheel bearing applications. The tapered roller bearings used in the railway industry are of a standard design fixed by the American Association of Railroads regulations. Nowadays rail industry improves the train operating speeds, which means that failure of a bearing will result into a derailment, affecting human lives, network disruption, and damage to the railroad, unplanned maintenance costs, and generating fear in general public about rail transport. So the rail industry has focused on the improvement in maintenance work and improvement in component design. This paper discusses the results of finite element analysis and model analysis of Cartridge Tapered Roller bearing (CTRB). Solid modelling of CTRB has been done using solid works. The CTRB is then discretized using ANSYS software and 3D hexahedral solid elements are used to mesh the components. The effect of vibration modes on the dynamic behaviour and stability of wagon is described. Frequencies up to a range of 100 Hz are considered for mode shapes.

Vibrational Characteristics of Tapered Roller Bearing Cages

2000 ◽  
Author(s):  
J. A. Karloff ◽  
W. N. Weins ◽  
R. C. Arnold
Keyword(s):  
Roller Bearing ◽  
Main Function ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Railway Industry ◽  
Load Carrying ◽  
Modeling Software ◽  
Vibrational Characteristics ◽  
Tapered Roller ◽  
Tapered Roller Bearings

Abstract One of the important components of a tapered roller bearing is the cage. The main function of the cage during operation is to maintain roller spacing. Although being one of the more complicated parts of a tapered roller bearing, historically, very little specific engineering has been published to provide a design basis for the tapered roller bearing cage. This work analyzed specifically, the cages from tapered roller bearings as used in the railway industry. As the load carrying requirements for railcars have increased, the size of bearing has also increased. Although cage dimensions have increased with bearing size, little specific engineering has been published to document the effect the change in size has on the durability of the larger cages. Testing was conducted to determine the amount of stress induced on the cage due to the vibration environment of a tapered roller bearing used in rail service. Cages evaluated were steel cages from 6 ½ × 12 and 7 × 12 tapered roller bearings and a plastic cage from a 6 ½ × 12 bearing. The natural frequencies of the cages were determined and then compared to the exciting frequencies of the bearings. Vibrations, internal and external to the bearing were measured at various simulated train speeds. The magnitude and frequencies of these excitation vibrations were input into the finite element modeling software, ALGOR®, to find the response of the cage. It was found that the stresses generated in the small end cage pocket of larger 7 × 12 steel cages were as much as twice that of the 6 ½ × 12 steel cages. The stress generated at the pocket of the 6 ½ × 12 plastic cage was smaller than the 6 ½ × 12 steel cage.

scholarly journals On the Measurement of Roller Skew of Tapered Roller Bearings

2012 ◽  
Vol 217-219 ◽  
pp. 2328-2331 ◽  
Author(s):  
Abiodun Falodi ◽  
Yong K. Chen ◽  
Martin Caspall ◽  
Brian Earthrowl ◽  
David Dell
Keyword(s):  
Roller Bearing ◽  
Radial Load ◽  
Double Row ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Variable Reluctance ◽  
Bearing Life ◽  
Tapered Roller ◽  
Tapered Roller Bearings ◽  
New System

Roller skew in roller bearings can cause heat generation and reduce bearing life. Therefore, design to minimise its occurrence is essential in bearing development. This study investigated the roller skew of a double row tapered roller bearing under various running conditions. A new system of measurement using two differential variable reluctance transducers (DVRT) was developed. It is evident that the roller skew of the double row tapered roller bearing can be measured. The shaft rotational speed has a significant effect on roller skew but the radial load has little effect.

The Radial and Axial Stiffnesses of Tapered Roller Bearings Under Combined Load

1996 ◽  
Vol 118 (1) ◽  
pp. 257-263 ◽  
Author(s):  
H. Zantopulos
Keyword(s):  
Roller Bearing ◽  
Axial Loads ◽  
Tapered Roller Bearing ◽  
Single Row ◽  
Combined Load ◽  
Roller Bearings ◽  
Tapered Roller ◽  
Tapered Roller Bearings

Equations and their derivations for finding the radial and axial stiffnesses of a single-row tapered roller bearing, assuming a rigid shaft and housing, are given for any case of combined radial and axial loads. This method is extended to include the two-row bearing under certain conditions. Also presented are tables to facilitate these calculations.

Tracking of Spall Deterioration on Tapered Roller Bearings

2015 ◽  
Author(s):  
Amy Gonzalez ◽  
Constantine Tarawneh ◽  
Ping Hu ◽  
Joseph A. Turner ◽  
Brent M. Wilson
Keyword(s):  
Roller Bearing ◽  
Surface Region ◽  
Near Surface ◽  
Tapered Roller Bearing ◽  
University Of Texas ◽  
Roller Bearings ◽  
Life Tests ◽  
Tapered Roller ◽  
Tapered Roller Bearings ◽  
Original Size

Fatigue spall initiation is one of the major modes of premature bearing failure. The spall initiation is often exacerbated by the presence of impurities in the near-surface region (∼400 μm) of the bearing raceways. Once a spall initiates, it can propagate rapidly, leading to abnormal bearing operation and possible catastrophic failure if not detected early. Testing performed at the University of Texas-Pan American (UTPA) has focused on ultrasonically scanned tapered roller bearings found to have inclusion content within 400 μm of the surface of the raceways. These bearings undergo accelerated service life tests in which spall initiation is detected and tracked over time while documenting spall growth. The work presented here provides several study cases that document the spall initiation and propagation on ultrasonically scanned tapered roller bearing components. Results show that spalls generally initiate on locations corresponding to sites of subsurface inclusions, and they grow many times their original size within relatively short operating periods. The study also shows that spalls tend to initiate and propagate at a faster rate on bearing cups (outer rings) than on cones (inner rings).

scholarly journals Endurance Tests With Large-Bore Tapered-Roller Bearings to 2.2 Million DN

1982 ◽  
Vol 104 (3) ◽  
pp. 293-298 ◽  
Author(s):  
R. J. Parker ◽  
H. R. Signer ◽  
S. I. Pinel
Keyword(s):  
High Speed ◽  
Roller Bearings ◽  
Standard Design ◽  
Endurance Tests ◽  
Life Tests ◽  
Tapered Roller ◽  
High Speed Design ◽  
Tapered Roller Bearings ◽  
Hoop Stresses ◽  
Thrust Load

Endurance life tests were run with standard design and optimized high-speed design 120.65-mm- (4.750-in.-) bore tapered-roller bearings at shaft speeds of 12,500 and 18,500 rpm, respectively. Standard design bearings of vacuum melted AISI 4320 and CBS-1000M, and high-speed design bearings of CBS-1000M and through-hardened AISI M-50 were run under heavy combined radial and thrust load until fatigue failure or until a preset cutoff time of 1100 hours was reached. Standard design bearings made from CBS 1000M material ran to a 10-percent life approximately six times rated catalog life. Twelve identical bearings of AISI 4320 material ran to ten times rated calalog life without failure. Cracking and fracture of the cones of AISI M-50 high-speed design bearings occurred at 18,500 rpm due to high tensile hoop stresses. Four CBS 1000M high-speed design bearings ran to twenty-four times rated catalog life without any spalling, cracking or fracture failures.

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.

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