Chapter 16
Clutches, Brakes,
Couplings, and Flywheels
Lecture Slides
The McGraw-Hill Companies 2012
Chapter Outline
Shigleys Mechanical Engineering Design
Model of Clutch
Shigleys Mechanical Engineering Design
Fig. 161
Friction Analysis of a Doorstop
Shigleys Mechanical Engineering Design Fig. 162
Friction Analysis of a Doorstop
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Fig. 162
Friction Analysis of a Doorstop
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Friction Analysis of a Doorstop
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Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
Example 161
Shigleys Mechanical Engineering Design
An Internal Expanding Centrifugal-acting Rim Clutch
Shigleys Mechanical Engineering Design Fig. 163
Internal Friction Shoe Geometry
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Fig. 164
Internal Friction Shoe Geometry
Shigleys Mechanical Engineering Design Fig. 165
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 = 90
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Fig. 166
Force Analysis
Shigleys Mechanical Engineering Design Fig. 167
Force Analysis
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Self-locking condition
Force Analysis
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Force Analysis
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Example 162
Shigleys Mechanical Engineering Design
Fig. 168
Example 162
Shigleys Mechanical Engineering Design
Example 162
Shigleys Mechanical Engineering Design
Example 162
Shigleys Mechanical Engineering Design
Example 162
Shigleys Mechanical Engineering Design
Example 162
Shigleys Mechanical Engineering Design
Example 162
Shigleys Mechanical Engineering Design
Example 162
Shigleys Mechanical Engineering Design Fig. 169
An External Contracting Clutch-Brake
Shigleys Mechanical Engineering Design Fig. 1610
Notation of External Contracting Shoes
Shigleys Mechanical Engineering Design Fig. 1611
Force Analysis for External Contracting Shoes
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Force Analysis for External Contracting Shoes
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For counterclockwise rotation:
Brake with Symmetrical Pivoted Shoe
Shigleys Mechanical Engineering Design Fig. 1612
Wear and Pressure with Symmetrical Pivoted Shoe
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Fig. 1612b
Force Analysis with Symmetrical Pivoted Shoe
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Force Analysis with Symmetrical Pivoted Shoe
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Notation for Band-Type Clutches and Brakes
Shigleys Mechanical Engineering Design Fig. 1613
Force Analysis for Brake Band
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Force Analysis for Brake Band
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Frictional-Contact Axial Single-Plate Clutch
Shigleys Mechanical Engineering Design Fig. 1614
Frictional-Contact Axial Multi-Plate Clutch
Shigleys Mechanical Engineering Design Fig. 1615
Geometry of Disk Friction Member
Shigleys Mechanical Engineering Design Fig. 1616
Uniform Wear
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Uniform Pressure
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Comparison of Uniform Wear with Uniform Pressure
Shigleys Mechanical Engineering Design Fig. 1617
Automotive Disk Brake
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Fig. 1618
Geometry of Contact Area of Annular-Pad Brake
Shigleys Mechanical Engineering Design Fig. 1619
Analysis of Annular-Pad Brake
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Uniform Wear
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Uniform Pressure
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Example 163
Shigleys Mechanical Engineering Design
Example 163
Shigleys Mechanical Engineering Design
Example 163
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Geometry of Circular Pad Caliper Brake
Shigleys Mechanical Engineering Design Fig. 1620
Analysis of Circular Pad Caliper Brake
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Example 164
Shigleys Mechanical Engineering Design
Example 164
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Cone Clutch
Shigleys Mechanical Engineering Design Fig. 1621
Contact Area of Cone Clutch
Shigleys Mechanical Engineering Design Fig. 1622
Uniform Wear
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Uniform Pressure
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Energy Considerations
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Energy Considerations
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Temperature Rise
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Newtons Cooling Model
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Effect of Braking on Temperature
Shigleys Mechanical Engineering Design Fig. 1623
Rate of Heat Transfer
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Heat-Transfer Coefficient in Still Air
Shigleys Mechanical Engineering Design Fig. 1624a
Ventilation Factors
Shigleys Mechanical Engineering Design Fig. 1624b
Energy Analysis
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Example 165
Shigleys Mechanical Engineering Design
Example 165
Shigleys Mechanical Engineering Design
Example 165
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Area of Friction Material for Average Braking Power
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Characteristics of Friction Materials
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Table 163
Some Properties of Brake Linings
Shigleys Mechanical Engineering Design Table 164
Friction Materials for Clutches
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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
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Square-jaw Clutch
Fig. 1625a
Overload Release Clutch
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Fig. 1625b
Shaft Couplings
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Fig. 1626
Flywheels
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Hypothetical Flywheel Case
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Fig. 1627
Kinetic Energy
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Engine Torque for One Cylinder Cycle
Shigleys Mechanical Engineering Design Fig. 1628
Coefficient of Speed Fluctuation, Cs
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Energy Change
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Example 166
Shigleys Mechanical Engineering Design
Example 166
Shigleys Mechanical Engineering Design
Table 166
Example 166
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Punch-Press Torque Demand
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Fig. 1629
Punch-Press Analysis
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Induction Motor Characteristics
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Induction Motor Characteristics
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Deceleration:
Acceleration:
Induction Motor Characteristics
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