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Chapter 16 Clutches, Brakes, Couplings, and Flywheels Lecture Slides The McGraw-Hill Companies © 2012

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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

Shigleys Mechanical Engineering Design

Fig. 162

Friction Analysis of a Doorstop

Shigleys Mechanical Engineering Design

Friction Analysis of a Doorstop

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

Example 161

Shigleys Mechanical Engineering Design

An Internal Expanding Centrifugal-acting Rim Clutch

Shigleys Mechanical Engineering Design Fig. 163

Internal Friction Shoe Geometry

Shigleys Mechanical Engineering Design

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

Shigleys Mechanical Engineering Design

Fig. 166

Force Analysis

Shigleys Mechanical Engineering Design Fig. 167

Force Analysis

Shigleys Mechanical Engineering Design

Self-locking condition

Force Analysis

Shigleys Mechanical Engineering Design

Force Analysis

Shigleys Mechanical Engineering Design

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

Shigleys Mechanical Engineering Design

Force Analysis for External Contracting Shoes

Shigleys Mechanical Engineering Design

For counterclockwise rotation:

Brake with Symmetrical Pivoted Shoe

Shigleys Mechanical Engineering Design Fig. 1612

Wear and Pressure with Symmetrical Pivoted Shoe

Shigleys Mechanical Engineering Design

Fig. 1612b

Force Analysis with Symmetrical Pivoted Shoe

Shigleys Mechanical Engineering Design

Force Analysis with Symmetrical Pivoted Shoe

Shigleys Mechanical Engineering Design

Notation for Band-Type Clutches and Brakes

Shigleys Mechanical Engineering Design Fig. 1613

Force Analysis for Brake Band

Shigleys Mechanical Engineering Design

Force Analysis for Brake Band

Shigleys Mechanical Engineering Design

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

Shigleys Mechanical Engineering Design

Uniform Pressure

Shigleys Mechanical Engineering Design

Comparison of Uniform Wear with Uniform Pressure

Shigleys Mechanical Engineering Design Fig. 1617

Automotive Disk Brake

Shigleys Mechanical Engineering Design

Fig. 1618

Geometry of Contact Area of Annular-Pad Brake

Shigleys Mechanical Engineering Design Fig. 1619

Analysis of Annular-Pad Brake

Shigleys Mechanical Engineering Design

Uniform Wear

Shigleys Mechanical Engineering Design

Uniform Pressure

Shigleys Mechanical Engineering Design

Example 163

Shigleys Mechanical Engineering Design

Example 163

Shigleys Mechanical Engineering Design

Example 163

Shigleys Mechanical Engineering Design

Geometry of Circular Pad Caliper Brake

Shigleys Mechanical Engineering Design Fig. 1620

Analysis of Circular Pad Caliper Brake

Shigleys Mechanical Engineering Design

Example 164

Shigleys Mechanical Engineering Design

Example 164

Shigleys Mechanical Engineering Design

Cone Clutch

Shigleys Mechanical Engineering Design Fig. 1621

Contact Area of Cone Clutch

Shigleys Mechanical Engineering Design Fig. 1622

Uniform Wear

Shigleys Mechanical Engineering Design

Uniform Pressure

Shigleys Mechanical Engineering Design

Energy Considerations

Shigleys Mechanical Engineering Design

Energy Considerations

Shigleys Mechanical Engineering Design

Temperature Rise

Shigleys Mechanical Engineering Design

Newtons Cooling Model

Shigleys Mechanical Engineering Design

Effect of Braking on Temperature

Shigleys Mechanical Engineering Design Fig. 1623

Rate of Heat Transfer

Shigleys Mechanical Engineering Design

Heat-Transfer Coefficient in Still Air

Shigleys Mechanical Engineering Design Fig. 1624a

Ventilation Factors

Shigleys Mechanical Engineering Design Fig. 1624b

Energy Analysis

Shigleys Mechanical Engineering Design

Example 165

Shigleys Mechanical Engineering Design

Example 165

Shigleys Mechanical Engineering Design

Example 165

Shigleys Mechanical Engineering Design

Area of Friction Material for Average Braking Power

Shigleys Mechanical Engineering Design

Characteristics of Friction Materials

Shigleys Mechanical Engineering Design

Table 163

Some Properties of Brake Linings

Shigleys Mechanical Engineering Design Table 164

Friction Materials for Clutches

Shigleys Mechanical Engineering Design

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

Shigleys Mechanical Engineering Design

Square-jaw Clutch

Fig. 1625a

Shigleys Mechanical Engineering Design

Fig. 1625b

Shaft Couplings

Shigleys Mechanical Engineering Design

Fig. 1626

Flywheels

Shigleys Mechanical Engineering Design

Hypothetical Flywheel Case

Shigleys Mechanical Engineering Design

Fig. 1627

Kinetic Energy

Shigleys Mechanical Engineering Design

Engine Torque for One Cylinder Cycle

Shigleys Mechanical Engineering Design Fig. 1628

Coefficient of Speed Fluctuation, Cs

Shigleys Mechanical Engineering Design

Energy Change

Shigleys Mechanical Engineering Design

Example 166

Shigleys Mechanical Engineering Design

Example 166

Shigleys Mechanical Engineering Design

Table 166

Example 166

Shigleys Mechanical Engineering Design

Punch-Press Torque Demand

Shigleys Mechanical Engineering Design

Fig. 1629

Punch-Press Analysis

Shigleys Mechanical Engineering Design

Induction Motor Characteristics

Shigleys Mechanical Engineering Design

Induction Motor Characteristics

Shigleys Mechanical Engineering Design

Deceleration:

Acceleration:

Induction Motor Characteristics

Shigleys Mechanical Engineering Design

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