The main purpose of this type of grouping is to enable very high reduction ratios to be achieved, while optimizing overall dimensions and mass. The structural diagram (figure
15
) applies to both a gearbox and a speed multiplier, with :
N
m0
/N
s0
= i
r
or N
s0
/N
m0
= i
m
with i > 1
If each elementary gearbox has a transmission ratio of value u
i
...
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