Geometrical values for standard cylindrical spur gears
Base circle－ db、rb
Tip circle－ da、ra
Root circle－ df、rf
Toot thickness－ sk
Space width－ ek
Pitch－ pk= sk +ek
Reference circle－－Basic circle for calculation
With standard module and pressure angle
Symbols： d、r、s、e，p= s+e
Addendumha Dedendum hf
Tooth depth h= ha+hf
Face width－ B
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