摘要:

To gain further knowledge of the wear phenomena in gear tooth flexible couplings, specimens of coupling materials were tested in an apparatus which simulates service conditions. The variable test parameters were load, amplitude of motion, speed, hardness, surface geometry, and lubricant. The wear patterns that were obtained in short-duration tests on this machine duplicate those found in service. A common gear steel, SAE 4140, was chosen as a standard material, and curves of wear versus load and amplitude of motion were generated for three different hardnesses of this material in a bath of 2190 TEP oil. Further investigations were made on ways to improve the performance of this material. These included special surface treatments, different lubricants, crowning of the surfaces, and other special surface geometries. Several other materials were tested with various crowns to compare their wear properties to that of the standard. These materials included 4340 steel, aluminum bronze versus NicuAl alloy, nitrided AMS 6475, nitrided 304 stainless steel, manganese bronze, CuAlNiFe alloy and worm wheel bronze versus 4140 steel. Of the materials tested, it appears that manganese bronze (Mil-B-16522 Class 1) is the best material for dental coupling use at the conditions of these tests.Contributed by the ASLE Technical Committee on Gears and Gear Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Philadelphia, Pennsylvania, April 1961.

ISSN:0569-8197    

DOI:10.1080/05698196108972431

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

The performance of grease lubricated and unlubricated ball bearings has been examined under various conditions of atmosphere and pressure. Data showing the effect on bearing life by the substitution of “self-lubricating” retainers for standard metallic cages are also included. The tests were run in atmospheres of oxygen, nitrogen, and air, at pressures from 0.5–1 mm Hg absolute to 33 inches Hg, The majority of tests were conducted at 232 C.

ISSN:0569-8197    

DOI:10.1080/05698196108972432

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

The structural and functional components of high temperature lubrication systems are metal assemblies, lubricants and elastomeric seals. How do combinations of these effect each other under the varying conditions of temperature and atmosphere? This question is often presented to the manufacturers of seals and of lubricants. A laboratory method for determining the answer is presented here. This method exposes combinations of lubricant, metal and elastomer to varying atmospheric conditions at a constant temperature. The degrading effects of temperature alone on each component of a lubricating system are known. This work was prepared to show that the proper selection of the sealing system components can prolong the life of the system.Contributed by the ASLE Technical Committee on Seals and Packings and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Cincinnati, Ohio, April 1960.

ISSN:0569-8197    

DOI:10.1080/05698196108972433

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

The viscosity, solubility, and density of several two- and three-phase lubricants were determined experimentally in a temperature range of 80 F to 200 F and a pressure range of 50 psia to 600 psia. Equations were found which would accurately describe the viscosity and density of these lubricants at other temperatures and pressures. Micro-size particles of molybdenum disulfide were suspended in petroleum-base oil with absorbed quantities of various gases. Lubricants of 4 weight per cent gas-oil mixtures had viscosity decreases of up to 60% relative to the oil viscosity, while the oil density remained virtually unchanged.Contributed by the ASLE Technical Committee on Properties of Lubricants and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Cincinnati, Ohio, April 1960.

ISSN:0569-8197    

DOI:10.1080/05698196108972434

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

An X-ray technique is described for the measurement of the thickness and shape of thin oil films (from 5 to 50 millionths of an inch thick) formed between the rolling and rolling-sliding surfaces of hardened steel rollers as in rolling bearings and gears. The film thickness with white mineral oil, diester-base, and silicone lubricants was found to vary with temperature (viscosity), speed, and load in much the same way as expected from elasto-hydrodynamic considerations. The shape of the elastically flattened contact regions on the rollers appeared to change with rolling speed in such a way as to explain why ball bearings and gears have longer fatigue life (in revolutions) at high speed than at low speed.

ISSN:0569-8197    

DOI:10.1080/05698196108972435

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

This paper discusses lubricating oil field tests conducted in two-cycle and four-cycle engines fueled with natural gas. The main objective was achieved; i.e., high performance lubricants were developed with low ash-forming properties. In the four-cycle engine program, it was found that (a) good oil oxidation stability was a primary requirement, (b) increasing either detergent or oxidation inhibitor level reduced piston ring belt deposits, and (c) a compounded paraffinic oil was markedly superior to an equally compounded naphthenic oil. In the two-cycle engines, (a) increased detergent concentration reduced port deposits, and (b) piston head deposits correlated with the oils' ash content.Contributed by the ASLE Technical Committee on Engine Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Philadelphia, Pennsylvania, April 1961.

ISSN:0569-8197    

DOI:10.1080/05698196108972436

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

In an earlier paper it was shown that mineral oils containing high molecular weight polymer would give better lubrication characteristics (lower friction and lower wear in a V-8 automotive engine) than straight mineral oils of the same viscosity. In this paper, the effects of polymer type, molecular weight and concentration are considered.

ISSN:0569-8197    

DOI:10.1080/05698196108972437

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

Hydrodynamic lubrication of journal-type bearings was demonstrated over the temperature range of 1200–1500 F with molten-salt 130 (62 LiF-37 BeF2-1 UF4, mole %). A number of demonstration tests were performed to investigate hydrodynamic lubrication at steady-state operating conditions, the ability to stop and restart rotation of the journal, performance over a range of Sommerfeld number from 0.009 to 2.0, thermal stability of the bearing material, and bearing configurations for sustaining unidirectional and bidirectional radial loading. These tests comprise 3900 hr of operation at high temperatures. As examples of the tests, one covered a period of 1000 hr at steady-state conditions and another covered a period of 272 hr, wherein 260 start-stop operations were performed. All the test bearings and journals were constructed of a nickel-molybdenum alloy. A molten-salt bearing was applied to a vertical centrifugal pump, and performance was satisfactory following initial tests wherein it was found that the bearing was being starved.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 Cincinnati, Ohio, April 1960.

ISSN:0569-8197    

DOI:10.1080/05698196108972438

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

A numerical procedure has been developed for the calculation of the performance of non-Newtonian, polymer-thickened lubricants in finite width journal bearings. Such oils were found to act as if they had averaged “anisotropic viscosities,” i.e., different viscosities in the circumferential and side leakage directions, even though the viscosity was taken to have one definite value, a function of the resultant shear stress, at each point in the oil film. Overall, polymer oils carried less load at a given eccentricity, gave less friction and a flatter pressure distribution than mineral oils of the same low shear viscosities. By analogy with the previously calculated infinite width case, which gave similar results, it is expected that the flatter viscosity temperature slope of the polymer oils will compensate for their apparent viscosity decrease. The program has also been adapted to “natural” boundary conditions, which improve upon the delineation of the cavitation region on the inlet side of the bearing.Contributed by the ASLE Technical Committee on Lubrication Fundamentals and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Philadelphia, Pennsylvania, April 1961.

ISSN:0569-8197    

DOI:10.1080/05698196108972439

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor

摘要:

The behavior of the oil in a cavitation region is studied. Boundary conditions of the pressure distribution at the inlet and at the outlet border of such a region are given. Calculation of the power loss in a cavitated zone is demonstrated.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 Cincinnati, Ohio, April 1960.

ISSN:0569-8197    

DOI:10.1080/05698196108972440

出版商:Taylor & Francis Group    

年代:1961

数据来源: Taylor