Evaluation of Lubricants for High-Temperature Ball Bearing Applications

1968 ◽  
Vol 90 (1) ◽  
pp. 106-112 ◽  
Author(s):  
R. J. Parker ◽  
E. N. Bamberger ◽  
E. V. Zaretsky

Several lubricants that are considered candidates for ball bearing applications in the temperature range of 500 to 700 deg F were investigated in full-scale ball bearings and in a rolling-contact fatigue rig. Bearing endurance tests indicate that a synthetic paraffinic oil with an antiwear additive can perform beyond catalog rating at temperatures up to 600 deg F in a low oxygen environment. In a rolling-contact fatigue tester, this synthetic paraffinic oil exhibited at least twice the fatigue life at the 10 percent level of a fluorocarbon and a polyphenyl ether. Based on bearing race groove appearance, elasto-hydrodynamic lubrication was apparent at outer-race temperatures up to 700 deg F.

1996 ◽  
Vol 118 (2) ◽  
pp. 434-442 ◽  
Author(s):  
J. R. Miner ◽  
J. Dell ◽  
A. T. Galbato ◽  
M. A. Ragen

Results of an Advanced Research Projects Agency (ARPA) sponsored project to demonstrate the operational benefits of incorporating advanced structural ceramic ball elements into the F117-PW-100 aircraft gas turbine engine high rotor thrust bearings is described. This program consists of design, fabrication, and experimental evaluation of candidate hybrid ball bearing designs in Pratt & Whitney and MRC Bearings test facilities. The bearing design criteria and development test conditions utilized for the project are compatible with the requirements of the F117-PW-100 engine system application. Two hybrid bearing designs were produced by analytically varying internal geometry features such as M-50 race curvatures and contact angles to optimize for the modulus of elasticity of the ceramic balls. CERBEC grade NBD 200 silicon nitride ceramic balls (1 1/8 in. size) demonstrated integrity and a quadruple rolling contact fatigue life improvement versus state-of-the-art M-50 steel balls in single ball test rigs. Thermal performance data obtained in full-scale bearing rig performance testing with 178 mm size hybrid and all-steel baseline bearings shows comparable characteristics. The hybrid bearing displayed a distinct survivability benefit in bearing liquid lubricant starvation testing. Two dozen hybrid bearings will be fabricated for full-scale bearing rig endurance tests to be conducted in 1995–1996 as a prerequisite to validation in operating F117-PW-100 engines in 1996–1997.


Author(s):  
D Nélias ◽  
T Yoshioka

This paper describes a deep groove ball-bearing analysis which has been developed to simulate acoustic emission occurring during ball-bearing operation. The computer simulation is useful to clarify experimental research on rolling contact fatigue initiation using the acoustic emission technique. Results show the ability of the method to detect and to locate a subsurface defect, due to rolling contact fatigue, before the rolling bearing failure occurs. The subsurface defect can be accurately located within the inner ring of a deep groove ball-bearing operating under radial load.


Wear ◽  
2011 ◽  
Vol 271 (5-6) ◽  
pp. 720-733 ◽  
Author(s):  
Robbie Balcombe ◽  
Mark T. Fowell ◽  
Andrew V. Olver ◽  
Stathis Ioannides ◽  
Daniele Dini

2019 ◽  
Vol 14 (4) ◽  
pp. 163-172
Author(s):  
Takumi Fujita ◽  
Naoya Hasegawa ◽  
Naoya Kamura ◽  
Toshihiko Sasaki

Author(s):  
J. R. Miner ◽  
J. Dell ◽  
A. T. Galbato ◽  
M. A. Ragen

Results of an Advanced Research Projects Agency (ARPA) sponsored project to demonstrate the operational benefits of incorporating advanced structural ceramic ball elements into the F117–PW–100 aircraft gas turbine engine high rotor thrust bearings is described. This program consists of design, fabrication and experimental evaluation of candidate hybrid ball bearing designs in Pratt & Whitney and MRC Bearings test facilities. The bearing design criteria and development test conditions utilized for the project are compatible with the requirements of the F117–PW–100 engine system application. Two hybrid bearing designs were produced by analytically varying internal geometry features such as M–50 race curvatures and contact angles to optimize for the modulus of elasticity of the ceramic balls. One–and–one–eighth inch size CERBEC grade NBD 200 silicon nitride ceramic balls demonstrated integrity and a quadruple rolling contact fatigue life improvement versus state–of–the–art M–50 steel balls in single ball test rigs. Thermal performance data obtained in full scale bearing rig performance testing with one–hundred–seventy–eight millimeter size hybrid and all–steel baseline bearings shows comparable characteristics. The hybrid bearing displayed a distinct survivability benefit in bearing liquid lubricant starvation testing. Two dozen hybrid bearings will be fabricated for full–scale bearing rig endurance tests to be conducted in 1995–1996 as a prerequisite to validation in operating F117–PW–100 engines in 1996–1997.


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