b) A differential band brake as shown in Figure 2 is being considered for use with a hoistdrum. With the hoist operating at rated load, a brake torque of 4000,000 Nmm is requiredto hold the drum from slipping. Available space limits the cast-iron brake drum diameter to650 mm, with brake band contact extending over an angle of 250°. Design values for thebrake lining selected are f = 0.40, Pmax = 1.1 MPa. i.ii.III.iv.DrumBand of width, w- RotationF2Figure 2Determine 7₁ and T₂ corresponding to maximum brake torqueSelect an appropriate value of brake band widthaIf distance a (Figure 2) is 120 mm, examine the value of distances that would enablethe brake to be operated with a force F₂ of 200 N at the end of a lever of length c = 650mm.Using the linkage dimensions from part (c), evaluate the value of s that would makethe brake self-locking

Answered: Image /qna-images/answer/34ee1dd9-17fd-41f2-9f9d-4da81a682293.jpg

b) A differential band brake as shown in Figure 2 is being considered for use with a hoist drum. With the hoist operating at rated load, a brake torque of 4000,000 Nmm is required to hold the drum from slipping. Available space limits the cast-iron brake drum diameter to 650 mm, with brake band contact extending over an angle of 250°. Design values for the brake lining selected are f= 0.40, Pmax = 1.1 MPa.

b) A differential band brake as shown in Figure 2 is being considered for use with a hoist drum. With the hoist operating at rated load, a brake torque of 4000,000 Nmm is required to hold the drum from slipping. Available space limits the cast-iron brake drum diameter to 650 mm, with brake band contact extending over an angle of 250°. Design values for the brake lining selected are f= 0.40, Pmax = 1.1 MPa.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.

Question

b) A differential band brake as shown in Figure 2 is being considered for use with a hoist
drum. With the hoist operating at rated load, a brake torque of 4000,000 Nmm is required
to hold the drum from slipping. Available space limits the cast-iron brake drum diameter to
650 mm, with brake band contact extending over an angle of 250°. Design values for the
brake lining selected are f = 0.40, Pmax = 1.1 MPa.

i.
ii.
III.
iv.
Drum
Band of width, w
- Rotation
F2
Figure 2
Determine 7₁ and T₂ corresponding to maximum brake torque
Select an appropriate value of brake band width
a
If distance a (Figure 2) is 120 mm, examine the value of distances that would enable
the brake to be operated with a force F₂ of 200 N at the end of a lever of length c = 650
mm.
Using the linkage dimensions from part (c), evaluate the value of s that would make
the brake self-locking

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