1. Muhannad Al_Waily_Machines Systems Design
Clutch and Break
Rim types with internal expanding shoes
Rim types with external contracting shoes
Band and block band types
Disk or axial types
Cone types
Miscellaneous types
Friction Materials
High and reproducible coefficient of friction
Imperviousness to environmental conditions, such as moisture
The ability to withstand temperatures, together with good thermal conductivity and diffusivity, as well as high specific heat capacity
Good resiliency
High resistance to wear, scoring, and galling
Compatible with the environment
Flexibility

2. Muhannad Al_Waily_Machines Systems Design

3. Frictional-Contact Axial Clutches
Muhannad Al_Waily_Machines Systems Design
Frictional-Contact Axial Clutches
Uniform Wear
Uniform Pressure
Uniform Wear
Uniform Pressure

4. Cone Clutches and Brakes
Muhannad Al_Waily_Machines Systems Design
Cone Clutches and Brakes
Uniform Wear
Uniform Pressure
Uniform Wear
Uniform Pressure

5. Muhannad Al_Waily_Machines Systems Design
Disk Brakes
Uniform Wear
Uniform Pressure
Uniform Wear

6. Circular (Button or Puck) Pad Caliper Brake
Muhannad Al_Waily_Machines Systems Design
Uniform Pressure
Circular (Button or Puck) Pad Caliper Brake

7. Internal Expanding Rim Clutches and Brakes
Muhannad Al_Waily_Machines Systems Design
Internal Expanding Rim Clutches and Brakes
The pressure distribution is sinusoidal with respect to the angle ' '
If the shoe is short, as shown in figure (a), the largest pressure on the shoe is ' pa ' occurring at the end of the shoe ' 2 '
If the shoe is long, as shown in figure (b), the largest pressure on the shoes is ' pa ' occurring at ' a = 900 '

8. Force and torque for counterclockwise rotation the actuating force is
Muhannad Al_Waily_Machines Systems Design
Force and torque
for counterclockwise rotation the actuating force is

9. Short-Shoe External Drum Brakes
Muhannad Al_Waily_Machines Systems Design
Short-Shoe External Drum Brakes
External Contracting Rim Clutches and Brakes
Long-Shoe External Drum Brakes
Short-Shoe External Drum Brakes
If the angle ' ' subtended by the arc of contact between shoe and drum is small (> about 450)

10. Long-Shoe External Drum Brakes
Muhannad Al_Waily_Machines Systems Design
Long-Shoe External Drum Brakes
If the rotation is counterclockwise

11. The pivot is symmetrically located
Muhannad Al_Waily_Machines Systems Design
The pivot is symmetrically located
The wear
The radial wear
Symmetry means (1=2)
because of symmetry
The torque

12. Band-Type Clutches and Brakes
Muhannad Al_Waily_Machines Systems Design
Band-Type Clutches and Brakes
forces in the vertical direction F F1 F2
F+dF
forces in the horizontal direction
The normal force ' dN '
The torque

13. For Differential Band Brake
Muhannad Al_Waily_Machines Systems Design ,
For simple band brake
For Differential Band Brake

14. Band and Block-Type Clutches and Brakes
Muhannad Al_Waily_Machines Systems Design
Band and Block-Type Clutches and Brakes

15. Muhannad Al_Waily_Machines Systems Design
forces in the vertical and horizontal direction
The torque