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CLUTCHES AND BRAKES 8.6
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FIGURE 8.2 Schematic drawing of an axial clutch; A, driving member; B, driven shaft; C, friction plates; D, driven plate; E, pressure plate.
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the drive direction causes the spring to tighten down on the hubs. Torque is then transmitted. But rotation in the opposite direction opens the spring, and no torque is transmitted. A magnetic clutch (Sec. 8.8) uses magnetic forces to couple the rotating members or to provide the actuating force for a friction clutch. Fluid couplings may make use of a hydraulic oil or a quantity of heat-treated steel shot. In the dry-fluid coupling, torque is developed when the steel shot is thrown centrifugally to the outside housing (keyed to the input shaft) as the input
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FIGURE 8.3 Schematic drawing of a radial clutch built within a gear; A, gear, the driving member; B, driven shaft; C, friction plate; D, pressure plate; E, movable sleeve; F, toggle link.This type of clutch can also be made within a V-belt sheave.
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CLUTCHES AND BRAKES
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FIGURE 8.4 Schematic drawing of a cone clutch; A, driving member; B, driven shaft; C, movable sleeve.
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shaft begins to rotate. At the design speed the shot is solidly packed, and the housing and rotor lock together. Control Methods. Mechanical control is achieved by linkages or by balls or rollers working over cams or wedges. The actuating force can be supplied manually or by solenoid, electric motor, air cylinder, or hydraulic ram. Electrical control of friction or tooth clutches often involves engaging the clutch electrically and releasing it by spring force. Thus the clutch is fail-safe: If power fails, the clutch is disengaged automatically. But where shafts are coupled for much longer periods than they are uncoupled, the opposite arrangement may be used: spring force to engage, electromagnetic force to disengage. Pneumatic, or hydraulic, control is accomplished in several ways. Actuating pistons may be used either to move the actuating linkage or to directly apply a normal force between frictional surfaces. In other designs an inflatable tube or bladder is used to apply the engagement force. Such designs permit close control of torque level. Automatic control of clutches implies that they react to predetermined conditions rather than simply respond to an external command. Hydraulic couplings and eddycurrent clutches both have torque regulated by the slip. Centrifugal clutches (Fig. 8.6) use speed to control torque.
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8.1.2 Selecting Clutches A starting point is a selection table constructed by Proctor [8.5] and reproduced here as Table 8.1. Four additional tables in Proctor s article also are useful for preliminary decisions. Designers will have to consult the manufacturers before making final decisions.
8.1.3 Types of Brakes Physically, brakes and clutches are often nearly indistinguishable. If two shafts initially at different speeds are connected by a device to bring them to the same speed,
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CLUTCHES AND BRAKES 8.8
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FIGURE 8.5 Overrunning clutches. (a) Roller-ramp clutch; springs are often used between the rollers and the stops. (b) Portion of a Formsprag clutch. Rockers or sprags, acting as cams, are pushed outward by garter springs at both ends of the prismatic sprags. (c) Torsion spring winds up when the clutch is in drive and grips both hubs. Largertorque loads can be carried by making the springs of rectangular-section wire.
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