Parallel move gear transmission meshing efficiency is researched based on the definition of efficiency.According to parallel move gear kinematic characteristic

the meshing point efficiency functions on internal and external parallel move gear mechanism which act respectively as speed reducing or increasing during the zone

divide by the pitch point

before the pitch point and after the pitch point are presented.It’s proved that the functions are continuous in the whole meshing zone.Considering two instance of meshing zone inside and outside pitch point

internal and exterior parallel move gear mechanism meshing efficiency calculating formula

both acting as speed reducing and increasing

are achieved based on midpoint’s principle of continuous function integrating.It’s proved both theoretically and experimentally that the formula is authentic.It’s useful to study the efficiency of parallel move gear mechanism.