Tsav chav tsev iav (Helical Gear Set) rau EV kis tau tus mob, Helical iav yog cylindrical iav hniav uas xa torque los ntawm ib tug ncej mus rau lwm tus.Nws yog qhov yooj yim, ua tau zoo thiab compact, ua rau lawv muaj kev xaiv nrov rau ntau daim ntawv thov.
Hom iav no yog tsim los tiv thaiv lub siab torque thiab kev kub ceev ntawm kev siv tsheb fais fab thiab feem ntau yog ua los ntawm cov khoom siv siab heev xws li hlau alloy lossis lwm yam hlau ruaj khov.