Shaft ya nyongolotsi, yomwe imadziwikanso kuti screw ya nyongolotsi, ndi chipangizo chomwe chimagwiritsidwa ntchito poyendetsa kayendedwe kozungulira pakati pa shaft ziwiri zosafanana. Chimakhala ndi ndodo yozungulira yokhala ndi mzere wozungulira kapena ulusi pamwamba pake.zida za nyongolotsiKumbali inayi, ndi mtundu wa giya womwe umafanana ndi sikuru, wokhala ndi m'mbali mwake muli mano omwe amalumikizana ndi mzere wozungulira wa shaft ya nyongolotsi kuti isamutse mphamvu.
Pamene shaft ya nyongolotsi ikuzungulira, mphuno yozungulira imasuntha giya la nyongolotsi, lomwe limasuntha makina olumikizidwa. Njirayi imapereka mphamvu yotumizira mphamvu zambiri, zomwe zimapangitsa kuti ikhale yoyenera ntchito zomwe zimafuna kuyenda mwamphamvu komanso pang'onopang'ono, monga makina a zaulimi.
Ubwino umodzi wogwiritsa ntchito shaft ya nyongolotsi ndi zida za nyongolotsi mu gearbox yaulimi ndi kuthekera kwawo kuchepetsa phokoso ndi kugwedezeka. Izi zili choncho chifukwa cha kapangidwe kake kapadera komwe kamalola kuti makina aziyenda bwino komanso mofanana. Izi zimapangitsa kuti makinawo asawonongeke kwambiri, zomwe zimapangitsa kuti nthawi yake yogwira ntchito ikhale yayitali komanso kuchepetsa ndalama zolipirira kukonza.
Ubwino wina ndi kuthekera kwawo kuwonjezera mphamvu yotumizira mphamvu. Ngodya ya spiral groove pa shaft ya worm imatsimikizira chiŵerengero cha magiya, zomwe zikutanthauza kuti makinawo akhoza kupangidwa mwapadera kuti alole liwiro linalake kapena kutulutsa mphamvu. Kuwonjezeka kwa mphamvu kumeneku kumapangitsa kuti mafuta azigwiritsidwa ntchito bwino komanso kuchepetsa kugwiritsa ntchito mphamvu, zomwe pamapeto pake zimapangitsa kuti pakhale ndalama zambiri.
Pomaliza, kugwiritsa ntchito shaft ya nyongolotsi ndi zida za nyongolotsi mu gearbox yaulimi kumachita gawo lofunika kwambiri pamakina aulimi ogwira ntchito bwino komanso ogwira mtima. Kapangidwe kawo kapadera kamalola kuti ntchito ikhale chete komanso yosalala pamene ikupereka mphamvu yowonjezereka yotumizira mphamvu, zomwe pamapeto pake zimapangitsa kuti ulimi ukhale wokhazikika komanso wopindulitsa.