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BEARINGS AND LUBRICATION
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On the other hand, lubrication may be used to modify friction but not specifically to reduce it. Certain composite brake materials may incorporate graphite or molybdenum disulfide, whose presence is designed to ensure steady or consistent levels of friction. The additives are clearly lubricants, and it would be pedantic to assert that their use in brake materials is not lubrication. This introduction is intended only to generate an open-minded approach to the processes of lubrication and to the selection of lubricants. In practice, the vast majority of systems are still lubricated by conventional oils or greases or by equally ancient but less conventional solid lubricants. It is when some aspect of the system makes the use of these simple lubricants difficult or unsatisfactory that the wider interpretation of lubrication may offer solutions. In addition to their primary function of reducing or controlling friction, lubricants are usually expected to reduce wear and perhaps also to reduce heat or corrosion. In terms of volume, the most important types of lubricant are still the liquids (oils) and semiliquids (greases). Solid lubricants have been rapidly increasing in importance since about 1950, especially for environmental conditions which are too severe for oils and greases. Gases can be used as lubricants in much the same way as liquids, but as is explained later, the low viscosities of gases increase the difficulties of bearing design and construction.
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20.2 SELECTION OF LUBRICANT TYPE
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A useful first principle in selecting a type of lubrication is to choose the simplest technique which will work satisfactorily. In very many cases this will mean inserting a small quantity of oil or grease in the component on initial assembly; this is almost never replaced or refilled. Typical examples are door locks, hinges, car-window winders, switches, clocks, and watches. This simple system is likely to be unsatisfactory if the loads or speeds are high or if the service life is long and continuous. Then it becomes necessary to choose the lubricant with care and often to use a replenishment system. The two main factors in selecting the type of lubricant are the speed and the load. If the speed is high, then the amount of frictional heating tends to be high, and lowviscosity lubricants will give lower viscous friction and better heat transfer. If the loads are high, then low-viscosity lubricants will tend to be expelled from the contact. This situation is summarized in Fig. 20.1. It is difficult to give precise guidance about the load and speed limits for the various lubricant types, because of the effects of geometry, environment, and variations within each type, but Fig. 20.2 gives some approximate limits. Some other property of the system will sometimes restrict the choice of lubricant type. For example, in watches or instrument mechanisms, any lubricant type could meet the load and speed requirements, but because of the need for low friction, it is normal to use a very low-viscosity oil. However, for open gears, wire ropes, or chains, the FIGURE 20.1 Effect of speed and load major problem is to prevent the lubricant on choice of lubricant type. (From Ref. from being thrown off the moving parts, and [20.1].)
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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FIGURE 20.2 Speed and load limitations for different types of lubricants. (From Ref. [20.2].)
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it is necessary to use a tacky bituminous oil or grease having special adhesive properties. In an existing system the geometry may restrict the choice of lubricant type. Thus, an unsealed rolling bearing may have to be lubricated with grease because oil would not be retained in the bearing. But where the lubrication requirements are difficult or particularly important, it will usually be essential to first choose the lubricant type and then design a suitable system for that lubricant. Some very expensive mistakes have been made, even in high technology such as aerospace engineering, where systems that could not be lubricated have been designed and built.
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