摘要:

AbstractAn elastorheodynamic analysis and a numercial solution are presented for grease film thicknesses in rolling point contacts for fully flooded, isothermal and steady state conditions. The contact surfaces are smooth and a grease four‐parameter rheological model is considered. A modified Reynolds equation is established and a complete numerical solution, including surface deformations, piezoviscous, and compressional effects is give

ISSN:0954-0075    

DOI:10.1002/ls.3010020402

出版商:John Wiley&Sons, Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractThis paper reviews the use of copper deactivators and iron corrosion inhibitors in lubricating oils. The auto‐oxidation process is described in terms of initiation and chain propagation, branching and termination, and the primary and secondary oxidation inhibitors are described. Copper deactivators and corrosion inhibitors nature and action are discussed, and the paper also examines the applications for these additive

ISSN:0954-0075    

DOI:10.1002/ls.3010020403

出版商:John Wiley&Sons, Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractThe application of advanced multilevel techniques to the solution of the EHL line contact problem has resulted in a multilevel solver of complexity O(n In n). The reduction in computing time thus obtained enables the use of large numbers of nodes and allows detailed study of the pressure spike. Both occurrence and height of the spike as a function of the governing parameters were studied. The parameter range where a pressure spike can be expected, and the results of spike height calculations, are presented.

ISSN:0954-0075    

DOI:10.1002/ls.3010020404

出版商:John Wiley&Sons, Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractThe anti‐wear action of zinc dithiophosphate (ZDDP), extensively used in engine oils, is here studied by analysis of wear particles generated during a friction test between two ferrous substrates. It is known in this case that the interfacial film is complex, and contains elements from surfaces, environment and degradation products of the additive. This paper deals with the presence and the form of sulphur species in the constitution of this film. Analytical Transmission Electron Microscopy (TEM, STEM, EDS and EELS filtered images) of particles shows that sulphur is in the form of small crystallites of iron sulphide Fe7S8, embedded in an amorphous phosphate matrix. Wear tests performed at different normal loads show the variation of the P/S ratio in the particles. The results are discusse

ISSN:0954-0075    

DOI:10.1002/ls.3010020405

出版商:John Wiley&Sons, Ltd    

年代:1990

数据来源: WILEY

ISSN:0954-0075    

DOI:10.1002/ls.3010020401

出版商:John Wiley&Sons, Ltd    

年代:1990

数据来源: WILEY