1. CHAPTER 20 GEARING AND CAMS INSTRUCTOR: M.YAQUB

2. ME 210: Gear: week#13 20.1 Gears Gears are used to transmit power and rotating or reciprocating motion from one machine part to another. Few gears are given in the next slide.

3. ME 210: Gear: week#13

4. 20.2 Spur Gear (For Parallel shaft) A friction wheel can be used to transmit power from one shaft to anther parallel shaft. It may have slip and a large pressure is required to avoid the slip. If teeth are provided on the surface, pressure can be reduces and no slip. It become a spur gear.

5. ME 210: Gear: week#13

6. Linear velocity = (pi) D n, it must be same for both gear to avoid relative motion. Hence

7. ME 210: Gear: week#13

9. SPUR GEAR

10. ME 210: Gear: week#13

11. 20.4 The shape of the tooth For minimum noise and smooth operation, the curved surface of the tooth profile must be a definite geometric form, the most common is involute profile. Pressure angle is important usually two pressure angle, 14.5 and 20 degree.

12. ME 210: Gear: week#13 How to construct a base circle

13. ME 210: Gear: week#13

17. Worm Gear For non parallel and non intersecting shaft

18. ME 210: Gear: week#13

19. Bevel Gear (For intersecting shaft)

20. ME 210: Gear: week#13