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1 兩軸相距80cm,一軸上裝50齒之正齒輪,周節為62.8mm,外接相配合之另一輪之轉速為250rpm,則50齒之輪轉速為
A 100rpm
B 200rpm
C 150rpm
D 250rpm

Pc=p×M

62.8=p×M

M=20(mm)

C=RA+RB

800=20×50/2+20×TB/2

TB=30

NBNATATB

250NA5030

NA=150(rpm)