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

2. Chapter Outline
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3. Model of Clutch
Fig. 16–1
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4. Friction Analysis of a Doorstop
Fig. 16–2
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5. Friction Analysis of a Doorstop
Fig. 16–2
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6. Friction Analysis of a Doorstop
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7. Friction Analysis of a Doorstop
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8. Example 16–1
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9. Example 16–1
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10. Example 16–1
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11. Example 16–1
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12. Example 16–1
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13. Example 16–1
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14. Example 16–1
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15. Example 16–1
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16. Example 16–1
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17. An Internal Expanding Centrifugal-acting Rim Clutch
Fig. 16–3
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18. Internal Friction Shoe Geometry
Fig. 16–4
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19. Internal Friction Shoe Geometry
Fig. 16–5
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20. 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
Fig. 16–6
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21. Force Analysis
Fig. 16–7
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22. Self-locking condition
Force Analysis
Self-locking condition
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23. Force Analysis
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24. Force Analysis
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25. Example 16–2
Fig. 16–8
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26. Example 16–2
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27. Example 16–2
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28. Example 16–2
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29. Example 16–2
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30. Example 16–2
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31. Example 16–2
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32. Example 16–2
Fig. 16–9
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33. An External Contracting Clutch-Brake
Fig. 16–10
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34. Notation of External Contracting Shoes
Fig. 16–11
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35. Force Analysis for External Contracting Shoes
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36. Force Analysis for External Contracting Shoes
For counterclockwise rotation:
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37. Brake with Symmetrical Pivoted Shoe
Fig. 16–12
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38. Wear and Pressure with Symmetrical Pivoted Shoe
Fig. 16–12b
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39. Force Analysis with Symmetrical Pivoted Shoe
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40. Force Analysis with Symmetrical Pivoted Shoe
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41. Notation for Band-Type Clutches and Brakes
Fig. 16–13
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42. Force Analysis for Brake Band
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43. Force Analysis for Brake Band
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44. Frictional-Contact Axial Single-Plate Clutch
Fig. 16–14
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45. Frictional-Contact Axial Multi-Plate Clutch
Fig. 16–15
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46. Geometry of Disk Friction Member
Fig. 16–16
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47. Uniform Wear
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48. Uniform Pressure
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49. Comparison of Uniform Wear with Uniform Pressure
Fig. 16–17
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50. Automotive Disk Brake Fig. 16–18
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51. Geometry of Contact Area of Annular-Pad Brake
Fig. 16–19
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52. Analysis of Annular-Pad Brake
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53. Uniform Wear
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54. Uniform Pressure
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55. Example 16–3
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56. Example 16–3
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57. Example 16–3
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58. Geometry of Circular Pad Caliper Brake
Fig. 16–20
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59. Analysis of Circular Pad Caliper Brake
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60. Example 16–4
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61. Example 16–4
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62. Cone Clutch
Fig. 16–21
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63. Contact Area of Cone Clutch
Fig. 16–22
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64. Uniform Wear
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65. Uniform Pressure
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66. Energy Considerations
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67. Energy Considerations
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68. Temperature Rise
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69. Newton’s Cooling Model
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70. Effect of Braking on Temperature
Fig. 16–23
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71. Rate of Heat Transfer
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72. Heat-Transfer Coefficient in Still Air
Fig. 16–24a
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73. Ventilation Factors Fig. 16–24b
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74. Energy Analysis
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75. Example 16–5
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76. Example 16–5
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77. Example 16–5
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78. Area of Friction Material for Average Braking Power
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79. Characteristics of Friction Materials
Table 16–3
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80. Some Properties of Brake Linings
Table 16–4
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81. Friction Materials for Clutches
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82. 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
Square-jaw Clutch
Fig. 16–25a
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83. Overload Release Clutch
Fig. 16–25b
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84. Shaft Couplings
Fig. 16–26
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85. Flywheels
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86. Hypothetical Flywheel Case
Fig. 16–27
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87. Kinetic Energy
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88. Engine Torque for One Cylinder Cycle
Fig. 16–28
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89. Coefficient of Speed Fluctuation, Cs
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90. Energy Change
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91. Example 16–6
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92. Example 16–6
Table 16–6
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93. Example 16–6
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94. Punch-Press Torque Demand
Fig. 16–29
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95. Punch-Press Analysis
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96. Induction Motor Characteristics
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97. Induction Motor Characteristics
Acceleration:
Deceleration:
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98. Induction Motor Characteristics
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