Relation between transverse pressure angle & normal pressure angle for helical gears

Q.  Which among the following relations is used to relate transverse pressure angle and normal pressure angle for helical gears?

where Φn =  normal pressure angle &  Φt = transverse pressure angle
- Published on 06 Aug 15

a. cos α = tan Φn / tan Φt
b. cos α = tan Φn x tan Φt
c. cos α = tan Φt / tan Φn
d. None of the above

ANSWER: cos α = tan Φn / tan Φt

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