I-gear shaft forgings ngokwemilo ye-axis, i-shaft inokwahlulwa ibe yi-crankshaft kunye ne-shaft eqondileyo iindidi ezimbini. Ngokomthamo wokuthwala we-shaft, inokwahlulwa kwakhona ibe:
(1) Ishafu ejikelezayo, xa isebenza, ithwala zombini umzuzu wokugoba kunye netorque. Yeyona shaft ixhaphakileyo koomatshini, njengeshafti kwizinciphisi ezahlukeneyo.
(2) i-mandrel, esetyenziselwa ukuxhasa iindawo ezijikelezayo kuphela zithwala umzuzu wokugoba kwaye ungadluliseli i-torque, ujikelezo oluthile lwe-mandrel, njenge-shaft yesithuthi sikaloliwe, enye i-mandrel ayijikelezi, njenge-pulley shaft exhasayo, njl.
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