Iav mechanisms yog siv los xa cov lus tsa suab thiab lub zog nruab nrab ntawm ob lub shafts thiab yog cov khoom siv dav siv ntau tshaj plaws. Lawv ua tiav cov kev xav tau ntawm kev sib kis los ntawm meshing ntawm iav hniav. Yog li ntawd, piv nrog cov neeg kho tshuab kis tau tus mob xws li kev sib txhuam lub log thiab rubeys, lawv cov txiaj ntsig tseem ceeb yog: kev sib kis ruaj khov, kev lag luam txhim khu kev qha, kev ua haujlwm siab, kev pab lub neej ntev, thiab ntau yam kev siv diameters, circumferential speeds, thiab lub zog.
Cov iav cylindrical yog ib hom iav tseem ceeb hauv cov iav iav thiab kuj yog cov iav zoo tshaj plaws. Raws li cov kev taw qhia ntawm cov hniav, cylindrical zog yuav muab faib ua spur gears, helical gears, thiab herringbone gears.
