Homework Help is Here – Start Your Trial Now!
Engineering
Mechanical Engineering
A differential band brake similar to the one shown in Figure 18.17 is being considered for use with a hoist drum. With the hoist operating at rated load, a brake torque of 4000 N·m is required to hold the drum from slipping. The brake is to be designed to slip at a 15 percent overload. 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. (a) Determine forces P₁ and P2 corresponding to maximum brake torque and select an appropriate value of brake band width. (b) If distance a (Figure 18.17) is 120 mm, what value of distances would enable the brake to be operated with a force F of 200 N at the end of a lever of length c = 650 mm? (c) Using the linkage dimensions from part b, what value of coefficient of friction would make the brake self-locking? Partial Ans. b 47.97 mm s = 13.4 mm f ≥ 0.5024

A differential band brake similar to the one shown in Figure 18.17 is being considered for use with a hoist drum. With the hoist operating at rated load, a brake torque of 4000 N·m is required to hold the drum from slipping. The brake is to be designed to slip at a 15 percent overload. 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. (a) Determine forces P₁ and P2 corresponding to maximum brake torque and select an appropriate value of brake band width. (b) If distance a (Figure 18.17) is 120 mm, what value of distances would enable the brake to be operated with a force F of 200 N at the end of a lever of length c = 650 mm? (c) Using the linkage dimensions from part b, what value of coefficient of friction would make the brake self-locking? Partial Ans. b 47.97 mm s = 13.4 mm f ≥ 0.5024

Elements Of Electromagnetics
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
See similar textbooks
icon
Related questions
Question

solve for given solutions 

A differential band brake similar to the one shown in Figure 18.17 is being considered for use with a hoist drum. With the hoist operating at rated load, a brake torque of 4000 N·m is required to hold the drum from slipping. The brake is to be designed to slip at a 15 percent overload. 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. (a) Determine forces P₁ and P2 corresponding to maximum brake torque and select an appropriate value of brake band width. (b) If distance a (Figure 18.17) is 120 mm, what value of distances would enable the brake to be operated with a force F of 200 N at the end of a lever of length c = 650 mm? (c) Using the linkage dimensions from part b, what value of coefficient of friction would make the brake self-locking? Partial Ans. b 47.97 mm s = 13.4 mm f ≥ 0.5024
Transcribed Image Text:A differential band brake similar to the one shown in Figure 18.17 is being considered for use with a hoist drum. With the hoist operating at rated load, a brake torque of 4000 N·m is required to hold the drum from slipping. The brake is to be designed to slip at a 15 percent overload. 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. (a) Determine forces P₁ and P2 corresponding to maximum brake torque and select an appropriate value of brake band width. (b) If distance a (Figure 18.17) is 120 mm, what value of distances would enable the brake to be operated with a force F of 200 N at the end of a lever of length c = 650 mm? (c) Using the linkage dimensions from part b, what value of coefficient of friction would make the brake self-locking? Partial Ans. b 47.97 mm s = 13.4 mm f ≥ 0.5024
Expert Solution
steps

Step by step

Solved in 2 steps with 3 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY
SEE MORE TEXTBOOKS