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Transmission Ratio
The transmission ratio is the relationship of the amount of gear-teeth, the diameter and the torque from the driven- to the driving wheels. The RPM is exactly the opposite. The overall transmission ratio is
created by multiplying the individual ratios.
Any possible intermediate gears (reverse gear) only change the direction of rotation. |
Ratio from the number of teeth |
z2 i = z1 |
z2 = z1 · i | z2 z1 =
i |
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Ratio from diameters |
d2 i = d1 |
d2 = d1 · i | d2 d1 =
i |
Ratio from rotary speeds |
n1 i = n2 |
n1 = n2 · i | n1 n2 =
i |
Overall ratio in general
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iges = i1 · i2 · i3 | iges i1 = i2 · i3 |
Overall ratio from the number of teeth, diameters |
z2·z4·z6 iges = z1·z3·z5 |
d2·d4·d6 iges = d
1·d3·d5 |
Overall ratio from torques |
ME iges =
MA | ME = MA · iges | ME MA = iges |
Overall ratio from rotary speeds |
nA iges =
nE | nA = nE·iges | nA nE = iges |
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