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CLUTCHES AND BRAKES 8.3
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CLUTCHES AND BRAKES
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Actuating force (band brake), lb (N) Brake drum radius, in (m) Radius to point on disk, in (m) Radius to center of pressure, in (m) Tire-rolling radius, in (m) Reaction force (drum brake), lb (N) Radius to rim of centrifugal brake, in (m) Effective friction radius, in (m) Inside radius, in (m) Outside radius, in (m) Total stopping distance, ft (m) Initial tension, lb (n) Stops per hour Web thickness, mils (mm) Combined delay time for driver reaction and brake system reaction, s Total stopping time, s Torque; nominal torque, lb ft (N m) Temperature of surrounding air, F ( C) Disk temperature, F ( C) Temperature rise, F ( C) Design torque, lb ft (N m) Load torque, lb ft (N m) Maximum torque, lb ft (N m) Prime mover torque, lb ft (N m) Rubbing velocity, ft/s (m/s) Initial velocity, ft/s (m/s) Final velocity, ft/s (m/s) Web velocity, ft/s (m/s) Web tension per unit thickness and unit width, lb/(mil in) [N/(mm m)] Vehicle weight, lb (N) Cone angle, deg Multiplier for circular disk brake pads Angular position of actuation force, deg Angle of wrap, deg Angular position, deg Starting position of brake shoe lining, deg Ending position of brake shoe lining, deg Shaft speed, rad/s Engagement speed, rad/s Initial shaft speed, rad/s
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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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CLUTCHES AND BRAKES 8.4
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Final shaft speed, rad/s Initial shaft speed on load side of clutch, rad/s Initial shaft speed on prime-mover side of clutch, rad/s
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This chapter begins with an introduction to brakes and clutches, the various types and their applications. The problem of energy dissipation and temperature rise is discussed along with the proper selection of friction materials. Design methods are presented for almost every type of brake and clutch. A discussion of the actuation problems of brakes and clutches, including electromagnetic devices, is also presented.
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8.1 TYPES, USES, ADVANTAGES, AND CHARACTERISTICS
8.1.1 Types of Clutches The characteristic use of a clutch is to connect two shafts rotating at different speeds and bring the output shaft up to the speed of the input shaft smoothly and gradually. Classifying clutches is done by distinguishing (1) the physical principle used to transmit torque from one member to another and (2) the means by which the members are engaged or by which their relative speed is controlled. Here, we classify clutches as follows: 1. Engagement or actuation method a. Mechanical b. Pneumatic c. Hydraulic d. Electrical e. Automatic 2. Basic operating principle a. Positive contact (1) Square jaw (2) Spiral jaw (3) Toothed b. Friction (1) Axial (2) Radial (3) Cone c. Overrunning (1) Roller (2) Sprag (3) Wrap-spring d. Magnetic (1) Magnetic particle (2) Hysteresis (3) Eddy current e. Fluid coupling (1) Dry fluid (2) Hydraulic
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.
CLUTCHES AND BRAKES 8.5
CLUTCHES AND BRAKES
Coupling Methods. Positive-contact clutches have interlocking engaging surfaces to form a rigid mechanical junction. Three types of positive-contact clutches are shown in Fig. 8.1. Frictional clutches are used most frequently. Two opposing surfaces are forced into firm frictional contact. Figures 8.2, 8.3, and 8.4 show axial, radial, and cone types. Overrunning clutches are used when two members are to run freely relative to each other in one direction but are to lock in the other. Roller, sprag, and wrapspring types are shown in Fig. 8.5. In the roller-ramp clutch (Fig. 8.5a), the members are locked together when the rollers (or balls) ride on a race with a slight cam profile. Eccentric cams are pinched between concentric races in the sprag-type clutches (Fig. 8.5b). And in the basic wrap-spring clutch (Fig. 8.5c), the spring s inside diameter is slightly smaller than the outside diameters of the input and output hubs. When the spring is forced over the two hubs, rotation of the input hub in
FIGURE 8.1 Positive-contact clutches. (a) Square-jaw the square teeth lock into recesses in the facing plate; (b) spiral-jaw the sloping teeth allow smoother engagement and one-way drive; (c) toothed-clutch engagement is made by the radial teeth.
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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