By William C. Orthwein
With ease amassing a variety of formulation, analytical equipment, and graphs for the layout and choice of a wide selection of brakes and clutches within the car, plane, farming, and production industries, this useful reference simplifies calculations, acquaints engineers with an expansive variety of purposes, and assists within the collection of parameters for particular layout demanding situations.
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Extra info for Clutches and Brakes - Design and Selection
These friction materials may operate either dry or wet (oil) and ﬁnd applications from tension control in manufacturing processes through overhead cranes, hoists, and industrial brakes and clutches and in farm and garden tractors. Some or all of the following materials, and others, that are now necessary to produce a lining having a high friction coeﬃcient may be embedded in the resin binders used . Copyright © 2004 Marcel Dekker, Inc. Friction Materials Cyanamid Mica Glass ﬁbers Vermiculite Graphite 11 Barite Rubber dust Cellulose Petroleum coke Wollastonite Collan Alumina Acrylic ﬁbers Because some of these materials have been classiﬁed as hazardous by one or both of the Occupational Safety and Health Administration (OSHA) or the American Conference of Governmental Industrial Hygienists (ACGIH) organizations, dust in the vicinity of their use and storage must be removed by vacuuming or by a dust suppressant according to the time schedules of one or both of OSHA and ACGIH.
Drum brake eﬃciency may be measured in terms of the ratio of the torque produced by the brake itself to the torque required to activate the brake, also known as the shoe factor; namely, T T ¼ M a Mp F Mf ð2-2Þ Brake eﬃciency is generally not a design factor in the analysis of drum brakes because it is dependent on too many factors [f1, f2, r/R, A, w, and (sin f)max] Copyright © 2004 Marcel Dekker, Inc. 40 Chapter 3 FIGURE 6 Geometry for calculating the moment due to pressure about point A for an internal shoe brake.
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. They are especially desirable in the last-mentioned application because their action can be made automatic without additional controls. I. DERIVATION OF EQUATIONS Figure 2 shows the quantities involved in the derivation of the force relations used in the design of a band brake. Consistent with the direction of rotation of the drum, indicated by N, the forces acting on an element of the band are as illustrated in the lower right section of Figure 2.