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Chapter 16
Clutches, Brakes,
Couplings, and Flywheels
Lecture Slides
The McGraw-Hill Companies © 2012
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Chapter Outline
Shigley’s Mechanical Engineering Design
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Model of Clutch
Shigley’s Mechanical Engineering Design
Fig. 16–1
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Friction Analysis of a Doorstop
Shigley’s Mechanical Engineering Design Fig. 16–2
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Friction Analysis of a Doorstop
Shigley’s Mechanical Engineering Design
Fig. 16–2
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Friction Analysis of a Doorstop
Shigley’s Mechanical Engineering Design
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Friction Analysis of a Doorstop
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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Example 16–1
Shigley’s Mechanical Engineering Design
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An Internal Expanding Centrifugal-acting Rim Clutch
Shigley’s Mechanical Engineering Design Fig. 16–3
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Internal Friction Shoe Geometry
Shigley’s Mechanical Engineering Design
Fig. 16–4
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Internal Friction Shoe Geometry
Shigley’s Mechanical Engineering Design Fig. 16–5
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Pressure Distribution Characteristics
Pressure distribution is sinusoidal
For short shoe, as in (a), the
largest pressure on the shoe is pa
at the end of the shoe
For long shoe, as in (b), the
largest pressure is pa at qa = 90º
Shigley’s Mechanical Engineering Design
Fig. 16–6
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Force Analysis
Shigley’s Mechanical Engineering Design Fig. 16–7
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Force Analysis
Shigley’s Mechanical Engineering Design
Self-locking condition
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Force Analysis
Shigley’s Mechanical Engineering Design
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Force Analysis
Shigley’s Mechanical Engineering Design
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Example 16–2
Shigley’s Mechanical Engineering Design
Fig. 16–8
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Example 16–2
Shigley’s Mechanical Engineering Design
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Example 16–2
Shigley’s Mechanical Engineering Design
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Example 16–2
Shigley’s Mechanical Engineering Design
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Example 16–2
Shigley’s Mechanical Engineering Design
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Example 16–2
Shigley’s Mechanical Engineering Design
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Example 16–2
Shigley’s Mechanical Engineering Design
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Example 16–2
Shigley’s Mechanical Engineering Design Fig. 16–9
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An External Contracting Clutch-Brake
Shigley’s Mechanical Engineering Design Fig. 16–10
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Notation of External Contracting Shoes
Shigley’s Mechanical Engineering Design Fig. 16–11
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Force Analysis for External Contracting Shoes
Shigley’s Mechanical Engineering Design
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Force Analysis for External Contracting Shoes
Shigley’s Mechanical Engineering Design
For counterclockwise rotation:
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Brake with Symmetrical Pivoted Shoe
Shigley’s Mechanical Engineering Design Fig. 16–12
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Wear and Pressure with Symmetrical Pivoted Shoe
Shigley’s Mechanical Engineering Design
Fig. 16–12b
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Force Analysis with Symmetrical Pivoted Shoe
Shigley’s Mechanical Engineering Design
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Force Analysis with Symmetrical Pivoted Shoe
Shigley’s Mechanical Engineering Design
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Notation for Band-Type Clutches and Brakes
Shigley’s Mechanical Engineering Design Fig. 16–13
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Force Analysis for Brake Band
Shigley’s Mechanical Engineering Design
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Force Analysis for Brake Band
Shigley’s Mechanical Engineering Design
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Frictional-Contact Axial Single-Plate Clutch
Shigley’s Mechanical Engineering Design Fig. 16–14
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Frictional-Contact Axial Multi-Plate Clutch
Shigley’s Mechanical Engineering Design Fig. 16–15
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Geometry of Disk Friction Member
Shigley’s Mechanical Engineering Design Fig. 16–16
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Uniform Wear
Shigley’s Mechanical Engineering Design
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Uniform Pressure
Shigley’s Mechanical Engineering Design
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Comparison of Uniform Wear with Uniform Pressure
Shigley’s Mechanical Engineering Design Fig. 16–17
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Automotive Disk Brake
Shigley’s Mechanical Engineering Design
Fig. 16–18
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Geometry of Contact Area of Annular-Pad Brake
Shigley’s Mechanical Engineering Design Fig. 16–19
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Analysis of Annular-Pad Brake
Shigley’s Mechanical Engineering Design
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Uniform Wear
Shigley’s Mechanical Engineering Design
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Uniform Pressure
Shigley’s Mechanical Engineering Design
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Example 16–3
Shigley’s Mechanical Engineering Design
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Example 16–3
Shigley’s Mechanical Engineering Design
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Example 16–3
Shigley’s Mechanical Engineering Design
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Geometry of Circular Pad Caliper Brake
Shigley’s Mechanical Engineering Design Fig. 16–20
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Analysis of Circular Pad Caliper Brake
Shigley’s Mechanical Engineering Design
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Example 16–4
Shigley’s Mechanical Engineering Design
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Example 16–4
Shigley’s Mechanical Engineering Design
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Cone Clutch
Shigley’s Mechanical Engineering Design Fig. 16–21
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Contact Area of Cone Clutch
Shigley’s Mechanical Engineering Design Fig. 16–22
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Uniform Wear
Shigley’s Mechanical Engineering Design
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Uniform Pressure
Shigley’s Mechanical Engineering Design
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Energy Considerations
Shigley’s Mechanical Engineering Design
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Energy Considerations
Shigley’s Mechanical Engineering Design
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Temperature Rise
Shigley’s Mechanical Engineering Design
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Newton’s Cooling Model
Shigley’s Mechanical Engineering Design
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Effect of Braking on Temperature
Shigley’s Mechanical Engineering Design Fig. 16–23
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Rate of Heat Transfer
Shigley’s Mechanical Engineering Design
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Heat-Transfer Coefficient in Still Air
Shigley’s Mechanical Engineering Design Fig. 16–24a
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Ventilation Factors
Shigley’s Mechanical Engineering Design Fig. 16–24b
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Energy Analysis
Shigley’s Mechanical Engineering Design
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Example 16–5
Shigley’s Mechanical Engineering Design
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Example 16–5
Shigley’s Mechanical Engineering Design
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Example 16–5
Shigley’s Mechanical Engineering Design
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Area of Friction Material for Average Braking Power
Shigley’s Mechanical Engineering Design
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Characteristics of Friction Materials
Shigley’s Mechanical Engineering Design
Table 16–3
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Some Properties of Brake Linings
Shigley’s Mechanical Engineering Design Table 16–4
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Friction Materials for Clutches
Shigley’s Mechanical Engineering Design
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Positive-Contact Clutches
Characteristics of positive-
contact clutches
◦ No slip
◦ No heat generated
◦ Cannot be engaged at high
speeds
◦ Sometimes cannot be
engaged when both shafts are
at rest
◦ Engagement is accompanied
by shock
Shigley’s Mechanical Engineering Design
Square-jaw Clutch
Fig. 16–25a
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Overload Release Clutch
Shigley’s Mechanical Engineering Design
Fig. 16–25b
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Shaft Couplings
Shigley’s Mechanical Engineering Design
Fig. 16–26
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Flywheels
Shigley’s Mechanical Engineering Design
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Hypothetical Flywheel Case
Shigley’s Mechanical Engineering Design
Fig. 16–27
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Kinetic Energy
Shigley’s Mechanical Engineering Design
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Engine Torque for One Cylinder Cycle
Shigley’s Mechanical Engineering Design Fig. 16–28
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Coefficient of Speed Fluctuation, Cs
Shigley’s Mechanical Engineering Design
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Energy Change
Shigley’s Mechanical Engineering Design
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Example 16–6
Shigley’s Mechanical Engineering Design
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Example 16–6
Shigley’s Mechanical Engineering Design
Table 16–6
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Example 16–6
Shigley’s Mechanical Engineering Design
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Punch-Press Torque Demand
Shigley’s Mechanical Engineering Design
Fig. 16–29
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Punch-Press Analysis
Shigley’s Mechanical Engineering Design
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Induction Motor Characteristics
Shigley’s Mechanical Engineering Design
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Induction Motor Characteristics
Shigley’s Mechanical Engineering Design
Deceleration:
Acceleration:
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Induction Motor Characteristics
Shigley’s Mechanical Engineering Design