Istruktura: Say loob tan paway a singsing na sakey a malimpek a plain bearing et malimpek so kurti to, ya akakonekta ed saray bola ya asero tan sakey a kulungan. Say spherical ya desinyo na duaran singsing et mamapawala na bearing ya man-self-align ed amin ya direksion.
Prinsipyo na Panagkimey: No saray puersa ed paway so onkikiwas ed spherical bearing, saray asero a bola ed baetan na loob tan paway a singsing so mangawit ed karga, kanian say bearing et makasungdo ed radial tan axial iran puersa. Diad parehon panaon, say malimpek iran tapew na loob tan paway a singsing so mamaabuloy ed bearing ya man-self-align, ya mamawas ed friction tan wear legan na operasyon.