Iav

Gears muaj ntau heev nyob rau hauv txhua yam kis tau tus mob, xws li gearboxes, qhov twg gears mesh nrog rau lwm yam sib xws gears hloov ceev, torque, thiab kev taw qhia. Gears feem ntau yog siv rau kev sib kis (vaj huam sib luag) lossis rau kev tawm suab. Peb tsuas yog muab precision hnub iav iav, planetary iav (Epicyclic gearing), thiab iav siv hauv tsheb sib txawv, thiab lwm yam.