Kupera ndi kugayamagiya ozunguliraMa seti a ma gearbox a helical ndi njira yosamala kwambiri yomwe imafuna kulondola komanso ukatswiri. Ntchito yovutayi imaphatikizapo kugwiritsa ntchito makina apamwamba kuti apange ndikukonza mano a ma gear, kuonetsetsa kuti akugwirizana bwino. Kapangidwe ka helical sikuti kamangowonjezera mphamvu yotumizira komanso kumachepetsa kukangana ndi phokoso. Mwa kupukutidwa ndi kupukutidwa mwamphamvu, ma seti a ma gear amakhala olimba komanso ogwira ntchito bwino, zomwe zimapangitsa kuti akhale abwino kwambiri pakugwiritsa ntchito ma torque ambiri komanso magwiridwe antchito osalala.
Makampani khumi apamwamba ku China, zida ndi antchito 1200, zidapeza zinthu 31 zopangidwa ndi ma patent 9. Zipangizo zopangira zapamwamba, zida zotenthetsera, ndi zida zowunikira.