Kugaya ndi kupera wazida za helicalma seti a ma helical gearbox ndi njira yosamala yomwe imafuna kulondola komanso ukadaulo. Ntchito yovutayi imaphatikizapo kugwiritsa ntchito makina apamwamba kwambiri kuti apange ndi kuyeretsa mano a magiya, kuonetsetsa kuti akugwirizana bwino kwambiri. Kapangidwe ka helical sikungowonjezera kufalikira kwa mphamvu komanso kumachepetsa kukangana ndi phokoso. Pochita mphero molimbika ndikupera, ma seti a zida amakwaniritsa kulimba komanso kuchita bwino, kuwapangitsa kukhala abwino kwa mapulogalamu omwe amafunikira torque yayikulu komanso kugwira ntchito bwino.
Makampani khumi apamwamba kwambiri ku China, okhala ndi antchito a 1200, adapeza zinthu zonse za 31 ndi ma patent 9. Zida zopangira zapamwamba, zida zopangira kutentha, zida zoyendera.