By William C. Orthwein
With ease accumulating quite a few formulation, analytical tools, and graphs for the layout and choice of a wide selection of brakes and clutches within the car, airplane, farming, and production industries, this convenient reference simplifies calculations, acquaints engineers with an expansive diversity of functions, and assists within the number of parameters for particular layout demanding situations.
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Additional info for Clutches and Brakes - Design and Selection
1-10Þ f2 f1 ðR cos f sin f À r sin fÞdf FIGURE 4 Geometry involved in calculating moment Mf about pivot point A. Copyright © 2004 Marcel Dekker, Inc. Externally and Internally Pivoted Shoe Brakes Integration of equation (1-10) yields Apmax wr Mf ¼ ½Rðcos 2f1 À cos 2f2 ÞÀ 4rðcos f1 À cos f2 Þ 4ðsin fÞmax 37 ð1-11Þ Here the quantity enclosed by the square brackets determines the algebraic sign of Mf and may cause it to be zero. The physical signiﬁcance of the algebraic sign for nonzero values of moment Mf depends upon the direction of rotation N of the drum.
SAE Handbook, 2003. Ludema, K. C. (1996). Friction, Wear, Lubrication. Boca Raton, FL: CRC Press. Engineering Plastics. , Westboro, MA. , Kawakami S. (1982). Eﬀects of various ﬁllers on the friction and wear of Polytetraﬂuoroethylene-based composites. Wear 79: 221–234. Anderson, J. C. (1986). The wear and friction of commercial polymers and composites. , ed. Friction and Wear of Polymer Composites. Composite Materials, Series 1. New York: Elsevier, pp. 329–362. Rabinowicz, Ernest. (1955). Friction and Wear of Materials.
Copyright © 2004 Marcel Dekker, Inc. 2 Band Brakes Band brakes are simpler and less expensive than most other braking devices, with shoe brakes, as perhaps their nearest rival. Because of their simplicity, they may be produced easily by most equipment manufacturers without having to purchase special equipment and without having to use foundry or forging facilities. Only the lining must be purchased from outside sources. Band brakes are used in many applications such as in automatic transmissions (Figure 1) and as backstops (Figure 5—devices designed to prevent reversal of rotation), for bucket conveyors, hoists, and similar equipment.