Mpira wakunja wozungulira ndi wosiyana kwambiri ndi mpira wakuzama wa groove, womwe umadziwika kuti m'mimba mwake mwa mphete yake yakunja ndi yozungulira ndipo imatha kuyikidwa pamalo ozungulira ozungulira a mpando wonyamulira kuti azisewera pawokha. kugwirizanitsa udindo.

Ngakhale kuti ntchito yake yoyambira iyenera kukhala yofanana ndi mayendedwe a mpira wakuya, koma chifukwa mayendedwe awa amagwiritsidwa ntchito kwambiri pamakina ovuta, kuyika ndi kuyika kwake sizolondola mokwanira, nsonga ya shaft ndi dzenje lapampando sizikugwirizana bwino, kapena mtengowo ndi wautali komanso wopindika.Pankhani ya magiredi akuluakulu, ndipo kulondola kwake sikuli kokwanira, ndipo zomangira zina zimakhala zovutirapo, momwe magwiridwe antchito amagwirira ntchito amachepetsedwa pang'ono chifukwa cha mayendedwe ozama a mpira wamtundu womwewo.Mwachitsanzo, mpira wozungulira wakunja wokhala ndi waya wapamwamba umagwiritsidwa ntchito ngati shaft yosalimba komanso yopatuka.Mtundu woterewu umakhala ndi mphete zosindikizira mbali zonse ziwiri kuti dothi lisalowe mwamphamvu.Amadzazidwa ndi mafuta oyenerera pafakitale ndipo safunikira kutsukidwa asanaikidwe.Palibe mafuta owonjezera omwe amafunikira, pamene wononga pamwamba pa mapeto otuluka a mphete yamkati yamkati imangiriridwa pa shaft.Mtengo wa axial wololedwa suyenera kupitirira 20% ya katundu wovotera.

Kachitidwe ka mpira wozungulira wakunja wokhala ndi manja owoneka bwino amafanana ndi akunja ozungulira okhala ndi waya wapamwamba, kupatula kuti waya wapamwamba suli pa mphete yamkati koma pamanja.Bowo lamkati la mpira wakunja wozungulira wokhala ndi dzenje lopindika ndi dzenje lopangidwa ndi 1:12 taper, lomwe limatha kukhazikitsidwa mwachindunji pamtengo wopindika, kapena kuyikidwa pa shaft ya kuwala popanda phewa pogwiritsa ntchito chitsamba chokhazikika, ndipo chivundikirocho chikhoza kusinthidwa bwino.