Page 306 - Tribology in Machine Design
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Lubrication and efficiency of involute gears 291
Case I: The coefficient of friction is constant
The first case to be considered is that of the constant friction coefficient
throughout the engagement. Integrating the equations describing the work
output, gives
The efficiency of the gears is therefore equal to
where i is the gear ratio.
The friction losses per minute are equal to
The efficiency can be written more simply and almost exactly by
considering the work input to be equal to
hence
