摘要:

Wide use of EHL principles in the field of bearing lubrication has been restricted by the unavailability of the geometry data needed for full solution of the EHL film thickness equations. A project to find an approximate, and yet accurate, equation for rolling element bearings which requires only geometry data available in bearing catalogues resulted in a simple equation containing only the bearing outside diameter.

ISSN:0569-8197    

DOI:10.1080/05698198108983007

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The Murch and Wilson thermal EHL analysis is used together with data on commercial mineral and synthetic lubricants to develop simple charts from which thermal correction factors can be determined for rolling element bearings and gears.

ISSN:0569-8197    

DOI:10.1080/05698198108983008

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The adhesive wear process was analyzed microscopically by successive observations in the SEM. Fractographic analysis of the transferred fragment was also conducted. Two modes of adhesive transfer were identified.

ISSN:0569-8197    

DOI:10.1080/05698198108983009

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The influence of the thickness and structure of thermally produced aluminum oxides on the microscopic frictional response of aluminum auto body sheet alloys 6010-T4, 6009-T4, and 2036-T4 has been investigated. A variety of oxide thicknesses and structures were produced through variation of exposure temperature and quench medium. Coefficients of friction for the surfaces were subsequently determined using a tool steel slider under three conditions of lubrication: unlubricated sliding, lubrication with oil-based DG4247, and lubrication with water-based DA4251.

ISSN:0569-8197    

DOI:10.1080/05698198108983010

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

An explicit expression for the pressure function in the lubricating film of an arbitrary narrow bearing configuration is derived using matched asymptotics and boundary layers to satisfy inlet and outlet pressure conditions. A simple analytical expression for the load-carrying capacity in narrow slider bearings is presented and agreement with accurate numerical results is discussed. A mathematical evidence is provided to show that load-carrying capacity in slider bearings is almost independent of the actual shape of the lubricating film.Presented at the 35th Annual Meeting in Anahelm, California, May 5–8, 1980

ISSN:0569-8197    

DOI:10.1080/05698198108983011

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

To obtain a better understanding of how bonded solid-lubricant film lubricate and wear (in general), the tribological properties of polyimide-bonded graphite fluoride films were studied (in specific). A pin-on-disk type of testing apparatus was used; but in addition to sliding a hemispherically tipped rider, a rider with a 0.95-mm-diameter flat area was slid against the film. This was done so that a lower, less variable contact stress could be achieved. Two stages (regimes) of lubrication were found to occur. In the first, the film supported the load and the lubricating mechanism consisted of the shear of a thin surface layer (of the film) between the rider and the bulk of the film. The second occurred after the bonded film had worn to the substrate, and consisted of the shear of very thin lubricant film between the rider and flat plateaus generated on the metallic substrate asperities. The film wear mechanism was found to be strongly dependent on contact stress.Presented at the 35th Annual Meeting in Anaheim, California, May 5–8, 1980

ISSN:0569-8197    

DOI:10.1080/05698198108983012

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

It is well known that the valve-stem seal has been used for the valve-stem application of automotive engines, and influences the lubricating status between the valve stem and a valve guide. The valve-stem seals are important in controlling consumption of lubricating oil for engines and in preventing air pollution.

ISSN:0569-8197    

DOI:10.1080/05698198108983013

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The use of “high-water” or “95/5” hydraulic fluids is expanding from limited utilization in very special equipment to broader applications in general industrial hydraulic equipment. The fluids contain 95- to 99-percent water and have essentially the viscosity of water. Since hydraulic equipment is designed for use with fluids having an oil-like viscosity, the performance of hydraulic equipment will be affected by the use of high-water fluids.

ISSN:0569-8197    

DOI:10.1080/05698198108983014

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A new type of hydraulic fluid, the high-water type, is being developed for use in industrial equipment which is currently using oil or oil-like fluids. In order to determine which factors affect the flow properties of high-water hydraulic fluids, a series of solutions ranging in viscosity from that of a water-glycol fluid (55 mPa·s or 250 SUS) to that of a high-water fluid (3 mPa·s or 35 SUS) was formulated by varying the amount of thickening agent. From flow rates of these fluids at known pressure and viscosity, the efficiency (percent loss of flow) was calculated. As would be expected, internal leakage from the high-pressure side of the pump to the low-pressure side was much greater with the 3 mPa·s fluids than with the 50 mPa·s fluids. Increasing the pump size increased pump efficiency at a given viscosity.

ISSN:0569-8197    

DOI:10.1080/05698198108983015

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A relationship between the pressure-viscosity coefficient of a liquid lubricant and the ambient pressure densities and viscosities at two or more temperatures has been derived. The emphasis was to derive a relationship based on fundamental properties of a liquid lubricant rather than to propose an empirical correlation. This relationship is then tested in representative lubricants by comparing the calculated values with experimental values.Presented at the 35th Annual Meeting in Anaheim, California, May 5–8, 1980

ISSN:0569-8197    

DOI:10.1080/05698198108983016

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor