KOM-UNIT4-Gear 2

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Law of toothed gearing – Involutes and cycloidal tooth profiles –Spur Gear terminology and definitions –Gear tooth action – contact ratio – Interference and undercutting. Helical, Bevel, Worm, Rack and Pinion gears

Engineering

Circular pitch (Pc)
• It’s a distance measured along the
circumference of pitch of the pitch circle from
a point on one tooth to the corresponding on
the adjacent tooth

Classification of mechanisms – Basic kinematic concepts and definitions – Degree of freedom, Mobility – Kutzbach criterion, Gruebler’s criterion – Grashof’s Law – Kinematic inversions of four-bar chain and slider crank chains – Limit positions – Mechanical advantage – Transmission Angle – Description of some common mechanisms – Quick return mechanisms, Straight line generators, Universal Joint – rocker mechanisms.

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KOM-UNIT4-Gear 2

1. Gear Unit-4

2. Gear tooth terminology

3. Circular pitch (Pc) • It’s a distance measured along the circumference of pitch of the pitch circle from a point on one tooth to the corresponding on the adjacent tooth

4. Diameteral Pitch Pd

5. Module

6. Velocity (Speed Ratio) N1 T1 = N2T2

7. Gear Ratio

8. Contact ratio

9. Gear material

10. Gear Manufacturing

11. Gear tooth failure

12. Problem

13. Law of Gearing

14. Proof -

15. .