Bibliography: p. 27.
|Series||Transactions of Machine Elements Division, Lund Technical University|
|LC Classifications||TJ1075 J6|
|The Physical Object|
|Pagination||27 p. :|
|Number of Pages||27|
Jacobson, B. O., , “Elasto-Solidifying Lubrication of Spherical Surfaces,” ASME Paper No. Lub 6. Jacobson, B. O., , “On the Lubrication of Heavily Loaded Cylindrical Surfaces Considering Surface Deformations and Solidification of Cited by: Contact of bodies occurs in all interfaces transmitting force or motion, or both. The Hertzian contact (Hertz , ) is referred to the frictionless contact between two cal contact is a special case of the Hertz contact, which is between two spheres, or between a sphere and the surface . The paper presents a numerical solution for the elastohydrodynamic lubrication of low modulus point contacts which is broadly equivalent to the theory of Grubin for materials of high elastic modulus. The theoretical results obtained for the variation of minimum film thickness using this approach are therefore expected to apply to conditions of Cited by: Poor lubrication. This article focuses on bearing failures associated with lubrication problems. Avoiding Lubricant Failures. Bearings fail for many reasons, but improper lubrication is at the top of the list, according to a variety of studies: Improper lubrication: 40 to 50 percent. Improper mounting: 25 to 30 percent. Other causes.
The relationships between the surface fatigue crack length, 2 a, and the ratio of the number of cycles to the number of cycles to failure, N/N f, in Ti-6Al-7Nb and Ti-6Al-4V ELI with an equiaxed α structure are shown in Fig. (Akahori et al., ) The number of cycles required for the first observation of an initial fatigue crack by light microscope is defined as the short fatigue crack. HMSO (), Wear resistant surfaces in engineering – A guide to their production properties and selection, Department of Trade and Industry, Her Majesty’s Stationary Office, London. Hutchings, I. M. (), Tribology – Friction and wear of engineering materials, Edward Arnold, London. Be careful in selecting lubrication, however, since different lubricants are often incompatible. You may order housed units pre-lubricated with a specified lubrication. When you receive a bearing or housed unit shipment, do not remove products from their packaging until they are ready for mounting so they do not become corroded or contaminated. Jacobson, B. () "Elasto-Solidifying Lubrication of Spherical Surfaces." American Society of Mechanical Engineers Paper No. LUB Jacobson, B. () "On the Lubrication of Heavily Loaded Cylindrical Surfaces Considering Surface Deformations and Solidification of the Lubricant," J. Lubr. Technol., 95(3), —
8 TIMKEN BEARING DAMAGE ANALSIS WITH LUBRICATION REFERENCE GUIDE The Timken Company Fig. 8. This photo, taken with a microscope, shows a debris contamination bruise on a bearing race. A corresponding surface map of the dent is shown in Fig. 9. Fig. 6. Hard particles caused contamination bruising on this spherical roller bearing. Fig. 5. The roughness of the wearing surfaces is an important consideration in EHD lubrication. Roughness is defined as the arithmetic average of the distance between the high and low points of a surface, and is sometimes called the centerline average (CLA). Pressure Lubrication •Characteristic: •Surfaces separated by films of molecular dimensions •Film Thickness: •About microinch •Examples: •Heavily loaded gears, diesel engine ring on liner at TDC, valve trains •Wear: •High during running in period —then becomes. ning accuracy, cage material, lubrication, heat dissipation and design of the bearing. It is therefore advisable to contact SKF Applications Engineering for advice. For enclosed and open bearings using grease lubrication, additional parameters have to be considered such as lubrication of cage guiding surfaces.