Tribology in Machine Design potx

[...]... 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. .. 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... 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, ... 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, not... 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 may be regarded as a major cause of the time-lag between the publication of new findings in 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... 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... 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... application in industry A further reason for this time-lag is the fact that too many tribologists fail to present their results and ideas in terms of principles and concepts that are directly accessible and appealing to the design engineer It is hoped that the procedures and techniques of analysis explained in this book will be found helpful in applying the principles of tribology to the design of the machine. .. motion, is indeed one of the most basic concepts of engineering, especially of engineering design The term tribology, apart from its conveniently collective character describing the field of friction, lubrication and wear, could also be used to coin a new word - tribodesign It should not be overlooked, however, that the term tribology is not all-inclusive In fact, it does not include various kinds of . 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 . visualizing 2 Tribology in machine design the engineering task of mechanical engineers in general, and of machine designers in particular. The task of a mechanical engineer consists of. concept 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.