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Machine design slide 19

# Machine design slide 19 - March30th,2011...

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ENGR 3220 – Machine Design ENGR 3220 – Machine Design March 30 March 30 th th , 2011 , 2011 Band Band     Brakes, Flywheels and Belts Brakes, Flywheels and Belts

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Band-Type Clutches and Brakes φ f e P P = 2 1 Force balance: Maximum Pressure bD P p a 1 2 =
Example 1 The brake shown in the figure has a coefficient of friction of 0.30 and is to operate using a maximum force F of 400 N. If the band width is 50 mm, find the braking torque.

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Energy Considerations ) ( 2 ) ( 2 1 2 2 1 2 1 I I I I E + - = ϖ ϖ When the rotating members of a machine are caused to stop by means of a brake, the kinetic energy of rotation must be absorbed by the brake. This energy appears in the brake in the form of heat. In the mechanical system in Figure (a), if inertias I 1 and I 2 have initial angular velocity ω 1 and ω 2 , during the clutch operation both angular velocity change and eventually becomes equal, the total energy dissipated will be:
Temperature Rise - = - - = t WC A h T T T T m C E T p CR p exp 1

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Machine design slide 19 - March30th,2011...

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