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All About Gear

To transmit motion between two shafts. or a shaft and a slide.


Sliding motion between Gears tooth surfaces.


Omega = Angular Velocity (rad/s)

Omega1*Radius1 = Omega2*Radius2


Practical limit for Velocity Ratio...

for Spur Gears = 6

for Helical Gears = 10

for higher ratios, two or more Gear Pairs are used.


Parallel Shafts:


Spur Gears - since Line Contact, 

    - Sudden application of load, 

    - high impact stresses, 

    - excessive noise at high speeds.


Helical Gears - starts with a point contact and extends along a diagonal line across the teeth - low impact stresses, reduction in noise. 


Spur Rack (infinite diameter), Pinion, Gear





External Gear, Internal Gear


External Pinion, External Gear => One rotates in CW, One rotates in CCW

External Pinion, Internal Gear => Both rotate in same direction



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