摘要:

An analytical solution to the problem of the lubrication of slider blocks of fixed wedge angle and finite width is presented. The method of solution is by the separation of variables which yields results conveniently shown in curve form illustrating the various slider properties. The analysis is not encumbered by the requirement of numerical or graphical methods of evaluation as in the case of Michell, and is similar in nature to the solutions of Muskat, Morgan, and Meres wherein explicit analytical expressions are derived for the slider characteristics. The solutions appear in the form of convergent series.

ISSN:0569-8197    

DOI:10.1080/05698195808972335

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

The effect of recess size on the pressure, flow and power requirements of several hydrostatic bearing configurations is described in terms of dimensionless coefficients called performance factors. Performance factors are determined analytically for a circular hydrostatic thrust bearing with a circular recess (for which there is a known solution), compared graphically with the electric analog solutions for this bearing and found to be in excellent agreement. The electric analog approach is also used to determine the performance factors of several other bearing configurations for which there are no known solutions. These data are presented in the form of dimensionless curves. It was found that for a given bearing configuration, there is a particular recess size which will give minimum supply pump power. Where limiting factors, such as, pump output pressure and/or flow do not dominate, it is suggested that bearings be designed to operate at the minimum pump power point.Presented at American Society of Lubrication Engineers Annual Meeting, held in Cleveland, April, 1958.

ISSN:0569-8197    

DOI:10.1080/05698195808972336

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

In a previous paper (6) it was shown that a viscosity gradient across an oil film allowed a hydrodynamic load to be carried between contra rotating discs. If there is a temperature (and viscosity) gradient, not only through the oil film but also in the direction of motion, a considerable load can be borne. The equations are set up and solved numerically giving coefficient for oil film thickness and friction. The oil film thickness is comparable (three quarters) of that carried by Michell pads. The computed results are applied to the parallel surface thrust bearing described by Fogg (2) in 1946 and shown to give tolerable agreement with the experimental findings.Contributed to the American Society of Lubrication Engineers by the author.

ISSN:0569-8197    

DOI:10.1080/05698195808972337

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

The theory for the thermal wedge thrust pad is given assuming (a) all the heat is taken away by the oil and (b) the viscosity is constant across the thickness of the film.

ISSN:0569-8197    

DOI:10.1080/05698195808972338

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

High temperatures impose special problems on the operation of high speed axially loaded ball bearings. Among these are fatigue, lubricant deposits, and aggravated friction and surface damage at areas of metal contact. This paper is concerned only with the friction and surface damage aspects of the problem. Since a small scale bearing was to be used in the experimental work, an analysis was made of spinning, one of the major friction sources, and the small-scale operating conditions were chosen to give ball-to-race surface temperatures approaching, as near as practical, the corresponding temperatures for full-scale bearings.

ISSN:0569-8197    

DOI:10.1080/05698195808972339

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

Two separate investigations were conducted to determine the effect of lubricants on the fatigue life of M-1 tool steel balls in the rolling contact fatigue spin rig. In the first investigation four paraffinic mineral oils with viscosities of 5 to 113 centistokes at the 100F test temperature were used. Longer life was obtained with more viscous oil, life varying approximately as the 0.2 power of lubricant viscosity. In the second investigation of methyl silicone, a paraffinic mineral oil, a sebacate, a water base glycol and an adipate, each of which had a viscosity of about 10 centistokes at the 100F test temperature, were used. The 10 per cent life was about 40 times as great with the silicone (best) as with the adipate (poorest). The life results correlated fairly well with the pressure viscosity characteristics as estimated from lubricants of the same base stocks.Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Cleveland, Ohio, April, 1958.

ISSN:0569-8197    

DOI:10.1080/05698195808972340

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

The boundary friction properties of the lubricated system of steel sliding on lead-base babbitt were investigated as a phase of the Association of American Railroads' sponsored project on freight car hot boxes. A friction pendulum was developed for determining the coefficients of boundary friction as a function of temperature with the specified metals lubricated with various lube oil additive blends.

ISSN:0569-8197    

DOI:10.1080/05698195808972341

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

The effects of temperature on the lubricity of a number of lubricants are studied. An apparatus designed to study lubricants under boundary conditions, with provisions for varying temperature, load, and speed, is described. Sharp transitions from smooth sliding to severe galling and seizure are observed at a specific temperature which is characteristic of the lubricant and the test conditions. These “failure temperatures” are useful in understanding the lubrication mechanism and in predicting lubricant performance.Presented as an American Society of Lubrication Engineers per at the Lubrication Conference held in Atlantic City, N.J., October, 1956.

ISSN:0569-8197    

DOI:10.1080/05698195808972342

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

To determine the effect of hardness on fretting wear, tests of AISI 4340 steel were made in an oil bath using a new machine designed to make fretting corrosion tests with a wide range of parameters. Hardness values from 258 to 743 Vickers were tested, the hardest specimen having a nitrided surface. The fretting action used, 0.005 in. reciprocating motion at pressures from 430 psi to 5840 psi, produced much less fretting than similar tests in air, with little or no oxide products resulting. The galled areas were measured for depth of pit and height of deposit with the results indicating some small effects due to hardness up to 460 Vickers. The nitrided specimens, however, produced smaller fretted areas and the roughening of their surfaces was shallow.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Atlantic City, N.J., October, 1956.

ISSN:0569-8197    

DOI:10.1080/05698195808972343

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

A test program was undertaken to determine the relative resistance to wear and galling of a variety of wrought and cast nickel-base alloys. Testing was done using a breakdown technique with a sliding velocity of 512 ft per min. at the contact surfaces. The results showed that none of the wrought alloys tested were outstanding in their behavior when self-mated. However, mating with dissimilar alloys containing hard phases or soft phases possessing lubricating qualities effected substantial improvements in many instances. The use of chromium, molybdenum disulfide or sulfurized protective coatings was found to be feasible for inhibiting galling as long as their limitations were understood.Presented at the Annual Meeting of the American Society of Lubrication Engineers held in Detroit, Mich., April, 1957.

ISSN:0569-8197    

DOI:10.1080/05698195808972344

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor