Meshing Dissimilar Pressure Angles 1

[ZCHSC]

I am dealing with a Chinese supplier / gear designer whose proposal for a geartrain includes several pairs of meshing spur gears with dissimilar diametral pitches and dissimilar pressure angles. I have found no reference in Dudley's Gear Handbook, our company's internal references, my college textbooks, or online, that discuss any methods for designing gears to run on each other with different pressure angles. This flies in the face of everything I've learned about gearing, and the language barrier between us is making a fundamental explanation difficult.

These gears will be powdered metal, so nonstandard pressure angles and diametral pitches are not uncommon, but non-matching DP and PA for a pair of meshing gears is something that blows my mind. Can anyone provide some insight into this??

 

[dimjim]

I have a feeling that this 10.2 dp was actually 10.16dp making it a 2.5 Module Gear in its first or original design. Probably a round up error was made at some point in the translation.

 

[mfgenggear]

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