Author: Marshall W. Dietrich
Publisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 28

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Author: Marshall W. Dietrich
Publisher:
ISBN:
Category :
Languages : en
Pages : 16

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Book Description

Author: Dennis P. Townsend
Publisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 28

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Book Description
Elastohydrodynamic analysis and experimental speed effects on ball spinning friction coefficients and torque.

Author:
Publisher:
ISBN:
Category : Lubrication and lubricants
Languages : en
Pages : 1340

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Author: Steven T. Miller
Publisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 20

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Book Description
An experimental apparatus was designed and constructed at the NASA Lewis Research Center to study one aspect of spinning friction based on interfacial slip over the entire ball-race contact area. The apparatus is capable of measuring spinning moments of less than 0. Ol inch-pound at maximum Hertz contact stresses to over 400 000 psi, speeds to 3500 rpm, and under varying contact configurations and conditions. From the torque measurement, a coefficient of spinning friction can be calculated. The apparatus comprises a drive assembly, a dead-weight load assembly, a spherical upper test specimen, a cylindrically grooved lower test specimen of varying conformity, a lower test specimen housing assembly incorporating a hydrostatic air-bearing assembly, and a torque-measuring system. In operation, the upper test specimen is loaded against the lower test specimen through the drive shaft assembly by the dead- weight load assembly. As the drive assembly is rotated, the upper test specimen rotates against the stationary lower test specimen actuating the torque-measuring system. Preliminary tests were conducted under varying Hertz stress to 136 000-psi maximum Hertz stress at a spinning speed of 950 rpm, with a 51 percent ball-groove conformity using a polyphenyl ether (5P4E), a highly purified naphthenic mineral oil, and a di-2-ethylhexyl sebacate (MIL-7808). It was found that the coefficient of spinning friction decreased with increasing maximum Hertz stress to an intermediate stress level and had a minimum value of 0. 122, 0. 089, and 0. 050, respectively, for the lubricants listed previously.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 532

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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :

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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 426

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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1498

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Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 472

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