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inexpensive to manufacture and assemble have a natural tendency to maintain a moderate and reasonably equable temperature have a high stiffness especially for ultra-precision applications There are many ways of categorizing the available types of bearings that are widely used, one of which is to classify them, based on the principle of operation, into rolling element, hydrodynamic, hydrostatic, aerodynamic and aerostatic bearings Some of these types of bearings are widely used in machines, while others may be limited in applications In this particular chapter, rolling element bearings are described in detail along with hydrodynamic and hydrostatic bearings, whereas gas bearings are described in the following chapter Each type of bearing can be classified according to the type of loading Bearings may be used to support radial loads, thrust loads or even combined loads depending on their construction Rolling element bearings and hydrodynamic bearings are widely used in conventional machines and in some precision machines On the other hand, hydrostatic bearings and aerostatic bearings are usually employed in precision and ultra-precision applications as they have desirable characteristics associated with a better stiffness accuracy and tolerance At present, aerodynamic bearings are still at the stage of development and are only used in laboratories The main problem associated with aerostatic bearings is its low load-carrying ability [3] The characteristics of each type of bearing will be discussed in the following sections, and a comprehensive comparison will be given in 7



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(7-51b)

Fig. 3-21.

The rolling element bearing is believed to have been invented at around the same time as the wheel Early bearings were made from either wood or leather and were lubricated with animal fat At that time, bearings were used in a manner similar to the bearing systems in modern day cars The technology essentially begins with the development of lubrication and rolling elements that are used in moving heavy stones, building blocks and carvings, water-raising equipment and windmills [1] The progress and development over the years as a result of exacting technology and sophisticated science has led to a significant improvement in the precision of bearings [1]





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In order to clearly understand the idea behind rolling element bearings, the definition of friction is first presented Friction is the resistance to relative motion of contacting bodies The measurement of friction, usually defined as the coefficient of friction, is a ratio of the tangential force required to initiate or sustain relative motion to the normal force that presses the surfaces together There are two types of frictions, namely, sliding friction and rolling friction as shown in Figure 61 Generally, rolling friction is less than sliding friction, and this became the principle behind rolling element bearings Other terms that may be used to describe this class of bearings are rolling-contact bearings, antifriction bearings and rolling bearings [4] Other bearing types with sleeves and journals utilize sliding friction, but they usually have an additional layer of lubricant

The mechanical advantage generated by two gears is the ratio of the number of teeth on the output gear A to the teeth on the input gear B: MA A : B MA A B 3-11

Fig 61: Friction in contact between two surfaces [5]

Since the number of teeth is directly related to the gear s circumference, MA Cout Cin 3-12

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In rolling element bearings, the shaft and outer members are separated by balls or rollers Since the contact areas are small and the stresses are high, the loaded parts of rolling element bearings are normally made of hard and high-strength materials, superior to those of the shaft and the outer member The parts are usually finished to extremely fine tolerances Although also known as antifriction bearings, these bearings are not completely frictionless The design of the rolling element bearing is usually associated with achieving the desired load capacity and life for the available space The essential parts of a rolling element bearing are illustrated with the aid of a ball bearing shown in Figure 62 The rolling elements in this case are the balls that rotate freely between the inner ring and the outer ring The inner ring is usually fixed rigidly to a rotating shaft, whereas the outer ring is fixed to a support A cage, a separator also known as retainer to hold the balls in position to avoid rubbing contact is also present Rolling element bearings without cages are available where the annulus is packed with the maximum number of rolling elements This type of bearing tends to have a higher load capacity but lower speed limits Lubricants such as grease or oil may be used together with the rolling element bearings Due to the difficulty associated with lubricating rolling element bearings, certain rolling element bearings may be lubricated with a thick layer of grease and sealed [1]

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