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Friction-induced heating in axially loaded ball bearings
Friction-induced Heating in Axially Loaded Ball Bearings. J. 0. Schwartz, JOLT, oz Ser. F, (I) (1970) 1055112; I2 figs., 3 tables, I7 rcfs. X comparison of theoretical and experimental results on the friction-induced heating in thrust-loaded ball bearings. Using computer techniques, heat transfer and friction generation models are developed which are reasonable, since the predictions are within f ro!h of the measured values. 3. LUBRICATION
AND LUBRICANTS
Squeeze-film Characteristics in Flat Hydrostatic Bearings with Incompressible Flow. M. L. Adams and W. Shapiro, ASLE Tvans., 12 (3) (1969) 183-189; 6 figs., 4 refs. A computerised analysis was used to determine bearing squeeze-film pad performance with various compensation types, capillary, orifice and constant flow. A parametric study was made on the single recess rectangular pad with a wide range of pad geometry each combined with each of the compensation types for the complete range of static pressure ratios. The use of the hydrostatic squeeze film characteristics and design curves developed are demonstrated. Machine Tool Lubrication. A. F. Brewa, Ind. Lubrication, 22 (3) (1970) 87-91; I table. An article intended for the education of management to the importance of ensuring that production is not lost because of faulty lubrication. It review?s briefly the various types of machine tools, their components and their lubricant requirements. Lubrication in Wire Drawing. Anon., Ind. Lubrication, 22 (3) (1970) 94-95; 6 refs. A short review of some of the factors involved in drawing and the requirements of lubricants necessary. Design Philosophy-Turbine Generator Lubricating Oil Systems. J. R. Conklin, Lubrication Eng., 26 (I) (1970) 15-21; 9 figs., 2 tables, I3 refs. The design philosophy of the turbine manufacturers, oil suppliers, purification equipment manufacturers and engineers/consultants is reviewed and summarised. Trends in the design, layout and fabrication of main turbine oil reservoirs and associated equipment are examined and standards on lubricating oil systems discussed. The design of oil systems is continually undergoing subtle changes influenced by changes in turbine Wear, 16 (1970) 151-163
design, changes in oil formulation, the demand for greater rcliabilitv and the demands of nuclear energy for l&er operation. Analysis of Externally Pressurised Gas Journal Bearing. 13. C. Majumdar, J. Mech. Eng. SCL., 12 (I) (1970) I-8; 9 figs., 2 tables, 8 refs. The theoIetica1 analysis by numerical method of solution of an externally pressurised gas journal bearing with multiple supply holes is presented. The load and flow are predicted bv considering both axial and circumferential flow and are expressed in dimensionless factors for different bearing design parameters. The results are compared with the similar available approximate method. Regimes of Elastohydrodynamic Lubrication. Ii. I,. Johnson, J. Mech. Eng. Ski., 12 (I) (1970) 9-16; 3 figs., 17 refs. The different regimes of behaviour in the elastohydrodynamic lubrication of rollers are displayed on a chart whose rectangular coordinates express the influence of elasticity of the solids and variation of viscosity of the lubricant with pressure, respectively. At light loads the behaviour is rigid isoviscous. At high loads the relative importance of the factors depend upon a single parameter suggested by Archard. Approximate boundaries for the various regimes are suggested. Using available computer solutions the variations in film thickness and pressure distribution in the different regimes are examined. Influence of Film Inlet Conditions on the Performance of Fluid Film Bearings. P. B. Neal, J. Mech. Eng. Sci., 12 (2) (1970) 153-155: I fig., I table, 3 refS. A modified Reynold’s equation is derived which incorporates a variation of viscosity through the thickness of the film. Application of the equation to the case of a square taper film pad shows that variation of viscosity through the film thickness at film entry can have a very significant effect on the operating conditions. Assessment of Bearing Wear by Neutron Activation Analysis. R. Oliver, D. Gibbons, A. D. Dolton and B. Metcalfe, Tribology, 3 (2) (1970) 93-94; 3 figs. A description of a method for the rapid assessment of the wear of overlay-plated internal combustion engine bearings, based on the analysis of the irradiated lubricating oil for indium by gamma-ray spectrometry, based on a high-resolution Ge(Li) semiconductor detector. Examples of its use are given.
AND LUBRICANTS
Squeeze-film Characteristics in Flat Hydrostatic Bearings with Incompressible Flow. M. L. Adams and W. Shapiro, ASLE Tvans., 12 (3) (1969) 183-189; 6 figs., 4 refs. A computerised analysis was used to determine bearing squeeze-film pad performance with various compensation types, capillary, orifice and constant flow. A parametric study was made on the single recess rectangular pad with a wide range of pad geometry each combined with each of the compensation types for the complete range of static pressure ratios. The use of the hydrostatic squeeze film characteristics and design curves developed are demonstrated. Machine Tool Lubrication. A. F. Brewa, Ind. Lubrication, 22 (3) (1970) 87-91; I table. An article intended for the education of management to the importance of ensuring that production is not lost because of faulty lubrication. It review?s briefly the various types of machine tools, their components and their lubricant requirements. Lubrication in Wire Drawing. Anon., Ind. Lubrication, 22 (3) (1970) 94-95; 6 refs. A short review of some of the factors involved in drawing and the requirements of lubricants necessary. Design Philosophy-Turbine Generator Lubricating Oil Systems. J. R. Conklin, Lubrication Eng., 26 (I) (1970) 15-21; 9 figs., 2 tables, I3 refs. The design philosophy of the turbine manufacturers, oil suppliers, purification equipment manufacturers and engineers/consultants is reviewed and summarised. Trends in the design, layout and fabrication of main turbine oil reservoirs and associated equipment are examined and standards on lubricating oil systems discussed. The design of oil systems is continually undergoing subtle changes influenced by changes in turbine Wear, 16 (1970) 151-163
design, changes in oil formulation, the demand for greater rcliabilitv and the demands of nuclear energy for l&er operation. Analysis of Externally Pressurised Gas Journal Bearing. 13. C. Majumdar, J. Mech. Eng. SCL., 12 (I) (1970) I-8; 9 figs., 2 tables, 8 refs. The theoIetica1 analysis by numerical method of solution of an externally pressurised gas journal bearing with multiple supply holes is presented. The load and flow are predicted bv considering both axial and circumferential flow and are expressed in dimensionless factors for different bearing design parameters. The results are compared with the similar available approximate method. Regimes of Elastohydrodynamic Lubrication. Ii. I,. Johnson, J. Mech. Eng. Ski., 12 (I) (1970) 9-16; 3 figs., 17 refs. The different regimes of behaviour in the elastohydrodynamic lubrication of rollers are displayed on a chart whose rectangular coordinates express the influence of elasticity of the solids and variation of viscosity of the lubricant with pressure, respectively. At light loads the behaviour is rigid isoviscous. At high loads the relative importance of the factors depend upon a single parameter suggested by Archard. Approximate boundaries for the various regimes are suggested. Using available computer solutions the variations in film thickness and pressure distribution in the different regimes are examined. Influence of Film Inlet Conditions on the Performance of Fluid Film Bearings. P. B. Neal, J. Mech. Eng. Sci., 12 (2) (1970) 153-155: I fig., I table, 3 refS. A modified Reynold’s equation is derived which incorporates a variation of viscosity through the thickness of the film. Application of the equation to the case of a square taper film pad shows that variation of viscosity through the film thickness at film entry can have a very significant effect on the operating conditions. Assessment of Bearing Wear by Neutron Activation Analysis. R. Oliver, D. Gibbons, A. D. Dolton and B. Metcalfe, Tribology, 3 (2) (1970) 93-94; 3 figs. A description of a method for the rapid assessment of the wear of overlay-plated internal combustion engine bearings, based on the analysis of the irradiated lubricating oil for indium by gamma-ray spectrometry, based on a high-resolution Ge(Li) semiconductor detector. Examples of its use are given.