摘要:

The paper presents data on the investigation of the conductivity of thin layers (10-7— 10-4m) of mineral oils and hydrocarbons between metal electrodes. Noble and commercial metals (gold, platinum, copper, aluminum) have been used. Part of lubricant conductivity of the contact of rough metal surfaces has been evaluated by computation and testing.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983049

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

End-face seals sometimes fail because the flexibly mounted face is unable to track the inevitable angular misalignment (relative to the shaft axis) of the fixed face, resulting in rubbing contact. It is important, then, that the critical amount of misalignment just to cause contact in a fully liquid-lubricated seal should be known so allowances can be made in the manufacturing and assembly tolerances.

ISSN:0569-8197    

DOI:10.1080/05698198108983050

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The present paper is primarily concerned with the synergistic effects of polar and organic sulfur compounds on the wear and surface roughness under boundary-lubrication (BL) conditions. The effects of lubricants containing the above two types of additives on the wear and the roughness of worn surface in a steel/steel sliding system have been investigated using a four-ball wear tester in air and argon atmospheres.

ISSN:0569-8197    

DOI:10.1080/05698198108983051

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The hardnesses of nitrogen-implanted steel surfaces have been measured with an abrasive wear technique capable of characterizing surface layers as thin as 25 nm. Treated steel disks and reference disks were abraded with 1–5 μm diamond, and relative wear resistances were calculated from the mass losses. Surface hardness was obtained from a relationship between wear resistance and hardness.

ISSN:0569-8197    

DOI:10.1080/05698198108983052

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The paper offers a basic investigation of magnetic-fluid sealing. The objectives aimed at quantitative relationships between the parameters of the magnetic circuit, the properties of the fluid, and the resulting Δp capacity of a single or multistage seal. The pole pieces were investigated with the aim of arriving at an optimum configuration which would yield maximum sealing capacity for a given total space. It is shown that lines of constant intensity represent to a good approximation also lines of constant pressure and thus potential interfaces for the magnetic fluid; and that maximum sealing capacity is obtained when tooth width is twice and intertooth spacing three times the clearance.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983053

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Mixtures of various proportions of a polyolester and a polyphenylether (5P4E) have been prepared and their elastohydrodynamic film thicknesses measured in a rolling point contact. It has been found that small amounts of polyolester reduce the film thickness of 5P4E far more than viscosity values would predict. One explanation for this is that the pressure-viscosity coefficient of 5P4E is very sensitive to small amounts of polyolester, and is reduced by a factor of five with only 20 percent of polyolester. This might result from the ester acting as a plasticizer in reducing the glass transition temperature of 5P4E. Alternatively, 5P4E may be behaving in a non-Newtonian fashion over the range of shear rates studied.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983054

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

It has been shown that the frictional properties of oil seals are expressed by an equation, f = Φ(μUb/Pr)1/3,where inμ, bandPrare the absolute viscosity of oil, the contact width of seal lip edge, and the total contact load of a sealing lip, respectively, under the stable condition. The proportional constant in this equation, Φ,is a function of the frictional properties, independent of a viscosity of oil and a sliding velocity. The quantityΦis related to the oil-film shape at the rubbing portion between the sealing lip of oil seals and shaft surface. The shape of the oil film is influenced by the sliding velocity of the rubbing surface because of the viscoelasticity of the rubber material forming the sealing lip. The value ofΦdepends on the velocity, decreasing with increasing velocity. Furthermore, Φdepends on the surface roughness of the shaft and sealing lip material.

ISSN:0569-8197    

DOI:10.1080/05698198108983055

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The use of ferrography to monitor the health of helicopter gearboxes undergoing fatigue substantiation trials is described. The results illustrate the sensitivity of ferrography in detecting the onset of gear fatigue and indicate that the fatigue was initiated by micropitting. This suggests that the gears were not properly lubricated under the fatigue loads.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983056

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor