# FME_Ch18

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Category: Education

fluid mechanic

## Presentation Transcript

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Chapter 18: Brakes and Clutches Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life. Marcus Aurelius, Roman Emperor

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Figure 18.1 Five types of brake and clutch. (a) internal, expanding rim type; (b) external contracting rim type; (c) band brake; (d) thrust disk; (e) cone disk. Brake and Clutch Types

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Figure 18.2 Thrust disk clutch surface with various radii. Figure 18.3 Effect of radius ratio on dimensionless torque for uniform pressure and uniform wear models. Thrust Disk

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Properties of Common Friction Materials Table 18.1 Representative properties of contacting materials operating dry.

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Table 18.2 Coefficient of friction for contacting materials operating in oil. Friction for Wet Clutch Materials

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Figure 18.4 Forces acting on elements of cone clutch. Cone Clutch

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Short-Shoe Brake Figure 18.5 Block, or short-shoe brake, with two configurations.

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Example 18.3 Figure 18.6 Short-shoe brake used in Example 18.3.

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Figure 18.7 Long-shoe, internal, expanding rim brake with two shoes. Long-Shoe, Internal Expanding Rim Brake

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Figure 18.8 Forces and dimensions of long-shoe, internal, expanding rim brake. Forces and Dimensions

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Example 18.4 Figure 18.9 Four-long-shoe, internal expanding rim brakes used in Example 18.4.

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Long-Shoe, External, Contracting Rim Brake Figure 18.10 Forces and dimensions of long-shoe, external, contracting rim brake.

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Pivot-Shoe Brake Figure 18.11 Symmetrically loaded pivot-shoe brake.

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Figure 18.12 Band brake. (a) Forces acting on band; (b) forces acting on element. Band Brake

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Example 18.7 Figure 18.13 Band brake used in Example 18.7.

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Capacities of Brake and Clutch Materials Table 18.3 Product of contact pressure and sliding velocity for brakes and clutches.

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Hydraulic Crane Brake Case Study Figure 18.14 Hoist line brake for mobile hydraulic crane. The cross-section of brake with relevant dimensions is given.