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Gears

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A gear is a mechanical device that transmits rotary motion by changing the magnitude and line of action of the effort force.

The effort force can be expressed as

F = W (r 1 r2.. r n ) / (R 1 R2.. R n )                                     (1)

where

F = effort force (N, lb f )

W = load force or weight (N, lb f )

r = gear wheel inside diameter (m, in)

R = gear wheel outside diameter (m, in)

Example - Gear Transmission and Effort Force

The effort force in a gear transmission with three wheels:

  • wheel 1 : r 1 = 0.05, R 1 = 0.12
  • wheel 2 : r2= 0.06, R2= 0.13
  • wheel 3 : r 3 = 0.07, R 3 = 0.14

and a weight load of 1000 N can be calculated as

F = W (r 1 r2r n ) / (R 1 R2R n )

= (1000 N) ((0.05 m) (0.06 m) (0.07 m)) / ((0.12 m) (0.13 m) (0.14 m))

= 96 N

= 0.1 kN

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