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.

CHAPTER 20GEARING 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.



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.



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

• Hence




SPUR GEAR



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.


How to construct a base circle





Worm Gear

For non parallel and non intersecting shaft



Bevel Gear (For intersecting shaft)




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.

Documents

spur gear slide

yaqub slide

intersecting shaft slide

base circle slide

bevel gear

worm gear

anther parallel shaft

pressure angle