Cov iav helicallub pinion shaftua lub luag haujlwm tseem ceeb hauv kev ua haujlwm zoo ntawm cov gearboxes helical, feem ntau siv hauv kev lag luam xws li tsheb, kev tsim hluav taws xob, thiab kev tsim khoom. Cov iav helical muaj cov hniav inclined ntawm lub kaum sab xis, uas tso cai rau kev sib kis fais fab du thiab ntsiag to dua piv rau cov iav ncaj.
Lub pinion shaft, ib lub iav me dua hauv lub gearbox, sib txuas nrog lub iav loj dua lossis cov iav teeb tsa. Qhov kev teeb tsa no muab kev sib kis torque siab dua nrog kev co thiab suab nrov tsawg dua. Nws tus qauv tsim ua kom muaj kev faib khoom zoo dua thoob plaws ntau cov hniav, ua kom lub zog ntawm lub iav system ruaj khov.
Cov ntaub ntawv xws li hlau sib xyaw lossis hlau uas tau ua los ntawm cov khoom siv tawv feem ntau siv rau cov pinion shafts kom tiv taus cov khoom hnyav thiab kev hnav. Tsis tas li ntawd, cov shafts no tau dhau los ntawm kev siv tshuab ua kom raug thiab kev kho cua sov kom ntseeg tau tias muaj kev sib dhos zoo thiab lub neej ua haujlwm ntev.