CHAPTER 20 GEARING AND CAMS INSTRUCTOR M YAQUB

CHAPTER 20 GEARING AND CAMS INSTRUCTOR: M. YAQUB 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. ME 210: Gear: week#13

ME 210: Gear: week#13

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. ME 210: Gear: week#13

ME 210: Gear: week#13

• Linear velocity = (pi) D n, it must be same for both gear to avoid relative motion. • Hence ME 210: Gear: week#13

ME 210: Gear: week#13

ME 210: Gear: week#13

SPUR GEAR ME 210: Gear: week#13

ME 210: Gear: week#13

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. ME 210: Gear: week#13

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

ME 210: Gear: week#13

ME 210: Gear: week#13

ME 210: Gear: week#13

ME 210: Gear: week#13

Worm Gear For non parallel and non intersecting shaft ME 210: Gear: week#13

ME 210: Gear: week#13

Bevel Gear (For intersecting shaft) ME 210: Gear: week#13

ME 210: Gear: week#13

ME 210: Gear: week#13

ME 210: Gear: week#13