This document discusses different types of friction in machine elements including clutches, belt drives, pivots, and brakes. It describes clutches as mechanical devices that engage and disengage power transmission between driving and driven shafts. It also outlines different types of belts used to transmit power between shafts over longer distances, including flat, V-belts, and ropes. Finally, it lists common types of brakes such as block, band, and internal expanding brakes which slow or stop motion by applying frictional resistance.

1. FRICTION IN
MACHINE ELEMENTS
UNIT-5

2. .

3. Types

4. SCREW JACK FRICTION
.

5. CLUTCH
FRICTION

6. INTRODUCTION -clutch
• A clutch is a mechanical device that engages
and disengages the power transmission,
especially from driving shaft to driven shaft.

7. TYPES

8. SINGLE PLATE CLUTCH

10. BELT AND ROPE DRIVES

11. • Power can be transmitted from one shaft to
another shaft either by flexible or non
flexible type of machine elements.
• Flexible : belts, ropes and chains
• Non flexible: cam, gears, clutches, coupling
• When the distance between the shaft is
large, then belt, ropes or chain are used.
• For smaller distance gear are used

12. CLASSIFICATION OF DRIVES

13. TYPES OF BELTS
• Flat belt
• V- belt
• Ropes (or circular belts)

14. OPEN BELT DRIVE

15. CROSSED OR TWISTED BELT DRIVE

16. COMPOUND BELT DRIVE

17. OPEN BELT DRIVE
WITH
SINGLE IDLER PULLEYS

18. PIVOT AND COLLAR
FRICTION

19. Bearing Surfaces

20. Types of Pivot Bearing

21. Collars

22. BRAKES

23. BRAKES
• It’s a mechanical device by means of which
motion of a body is retarded for slowing down
(or) to bring it to rest by applying artificial
frictional resistance

24. Types
1. Block Brakes
2. Band Brakes
3. Block &Band Brakes
4. Internal Expanding Brakes