Tribology in Machine Design Episode 1 docx

[...]... bearings of a steam turbine are further examples in this respect Thus, it can be safely concluded that tribodesign is an obvious, and even indispensible, branch of machine design and, therefore, of mechanical engineering in general In any attempt to integrate tribology and tribodesign into mechanical engineering and machine design, it is advantageous to start by visualizing 2 Tribology in machine design. .. certain general principles, typical for machine design, are also applicable in tribodesign However, there are certain principles that are specific to tribodesign, but still hardly known amongst machine designers It is hoped that this book will encourage designers to take advantage of the results, concepts and knowledge offered by tribology 1. 2 Tribological problems in machine design The view that tribology, ... failure The loading conditions of cams are never steady and this fact should also be considered at the design stage 10 Tribology in machine design 1. 2.5 Friction drives Friction drives, which are being used increasingly in infinitely variable gears, are the converse of hypoid gears in so far as it is the intention that two smooth machine elements should roll together without sliding, whilst being able to... practical aim of tribology lies in its successful application to machine design The most appropriate form of this application is tribodesign, which is regarded here as a branch of machine design concerning all machine elements where friction, lubrication and wear play a significant part In its most advanced form, tribodesign can be integrated into machine design to the extent of leading to novel and... bearing 1. 1 Specific principles of tribodesign Two principles, specific to tribodesign, that is, the principle of preventing contact between rubbing surfaces, and the equally important principle of regarding lubricant films as machine elements and, accordingly, lubricants as engineering materials, can be distinguished In its most general form the principle of contact prevention is also taken to embody inhibiting,... tribology 1. 2 Tribological problems in machine design The view that tribology, in general, and tribodesign, in particular, are intrinsic parts of machine design can be further reinforced by a brief review of tribological problems encountered in the most common machine elements 1. 2 .1 Plain sliding bearings When a journal bearing operates in the hydrodynamic regime of lubrication, a hydrodynamic film develops... design the engineering task of mechanical engineers in general, and of machine designers in particular The task of a mechanical engineer consists of the control, by any suitable means, of flows of force, energy and matter, including any combination and interaction of these different kinds of flow Conversion from one form of energy to another may also result in kinetic energy, which in turn involves motion... book will be found helpful in applying the principles of tribology to the design of the machine elements commonly found in mechanical devices and systems It is designed to supplement the Engineering Science Data Unit (ESDU) series in tribology (well known to practising engineers), emphasizing the basic principles, giving the background and explaining the rationale of the practical procedures that are... that will not only be useful to practising designers, researchers and postgraduate students, but will also find an essential place in libraries catering for engineering students on degree courses in universities and polytechnics It is rather surprising that, in most mechanical engineering courses, tribology or at least the application of tribology to machine design - is not a compulsory subject This... higher kinematic pairs, rolling contact bearings and surface damage of machine elements The concept of tribodesign is introduced in Chapter 1 Chapter 2 is devoted to a brief discussion of the basic principles of tribology, including some new concepts and models of lubricated wear and friction under complex kinematic conditions Elements of contact mechanics, presented in Chapter 3, are confined to the . of tribodesign 1 1 .1. Specific principles of tribodesign 4 1. 2. Tribological problems in machine design 6 1. 2 .1. Plain sliding bearings 6 1. 2.2. Rolling contact bearings 7 1. 2.3. . journal bearing design 217 5.9 .1. Bearing fit 218 5.9.2. Grooving 219 5.9.3. Clearance 219 5.9.4. Bearing materials 220 5 .10 . Selection and design of thrust bearings 2 21 5 .10 .1. Tilting-pad. lubricated sliding bearings 12 1 4.9 .1. Axially loaded bearings 12 3 4.9.2. Pivot and collar bearings 12 4 4 .10 . Drives utilizing friction force 12 7 4 .10 .1. Belt drive 12 8 4 .10 .2. Mechanism