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77
approximation in calculation of efficiency of gear trains, if more
pertinent data are not available.
The chart values include loss for ball or roller bearings.
2. Equivalent System Concept
Tooth mesh loss of a pair of gears in a planetary train depends upon
the same factors as for pair of gears with fixed centers. Here, also, it can
be assumed that the loss in engagement is proportional to the product of
the tangential force at the pitch circle of the driving gear and the
velocity of engagement:
F
v
L
∆
=
(5)
Ratio of Numbers of Teeth (pinion/gear)
Fig. 1 — Efficiency losses from sliding friction between a pair of full-
depth 20-degree spur gears of British standard form. Losses vary negligibly
for different tooth forms and pressure angles
Efficiency Loss (per cent)
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