Mpira wanthawi zonse umakhala ndi mipikisano yamkati ndi yakunja, zinthu zingapo zozungulira zomwe zimalekanitsidwa ndi chonyamulira, ndipo, nthawi zambiri, zishango ndi/kapena zosindikizira zomwe zimapangidwira kuti zisungidwe ndi mafuta. Akayika, mpikisano wamkati nthawi zambiri umakanikizidwa pang'ono. shaft ndi mpikisano wakunja womwe umachitikira m'nyumba.Mapangidwe amapezeka kuti azitha kunyamula katundu woyengedwa bwino wa ma radial, katundu wa axial (thrust), komanso katundu wophatikizika wa radial ndi axial.

Mapiritsi a mpira akufotokozedwa kuti ali ndi mfundo;ndiko kuti, mpira uliwonse umalumikizana ndi mpikisano mu kagawo kakang'ono kwambiri - mfundo, m'malingaliro.Ma bearings amapangidwa kotero kuti kupunduka pang'ono komwe mpira kumapanga pamene ukudutsa ndi kutuluka m'dera la katundu sikudutsa malo okolola;mpira wosatulutsidwa umabwerera ku mawonekedwe ake oyambirira.Mapiritsi a mpira alibe moyo wopanda malire.Pamapeto pake, amalephera chifukwa cha kutopa, kutaya thupi, kapena zifukwa zina zilizonse.Amapangidwa paziwerengero zokhala ndi moyo wothandiza pomwe chiwerengero china chikuyembekezeka kulephera pambuyo pa kusinthika kokhazikika.

Opanga amapereka mizere yozungulira mzere umodzi mumindandanda inayi pamitundu yosiyanasiyana yoboola.Angular contact bearings amapangidwa kuti athe kupirira kukweza kwa axial mbali imodzi ndipo amatha kuwirikiza kawiri kuti athe kunyamula mayendedwe awiri.

Kukhazikika kwa shaft ndi kunyamula zimagwira ntchito yofunika kwambiri pakubala moyo.Pakuwongolera molakwika kwapamwamba, mayendedwe odziyimira okha amagwiritsidwa ntchito.

Pofuna kuonjezera mphamvu ya ma radial-load, chonyamulira chonyamula chimachotsedwa ndipo malo pakati pa mafuko amadzaza ndi mipira yambiri yomwe ingagwirizane nayo-chomwe chimatchedwa kudzaza kwathunthu.Kuvala mu ma bearings awa ndikokwera kwambiri kuposa omwe amagwiritsa ntchito zonyamulira chifukwa chopaka pakati pa zinthu zolumikizirana.
M'magawo ovuta omwe kutha kwa shaft kumakhala kodetsa nkhawa - zopota za zida zamakina, mwachitsanzo - ma bearings amatha kulowetsedwa kuti alandire chilolezo chilichonse pagulu lomwe laloledwa kale.