Structure ya roulement .

Ba roulements ekabolamaka libosoliboso na ba roulements roulants mpe ba roulements ya pamba. Roulement roulant esalelaka ba boule ya acier to ba rouleaux mpo na ko réduire friction, esali que coefficient ya friction ezala na se ya 0.001-0.005, ekomisaka yango ebongi mpo na rotation ya likolo{10}}vitesse. Ndakisa ezali na ba roulements à billes ya rainure profonde (vitesse maximum 10.000 rpm) mpe roulements rouleaux coniques (angle de contact 10 degrés -30 degrés ). Ba roulements ya pamba esalemi na film ya lubrifiant, oyo esali que coefficient ya friction ya soki 0.01-0.1, esala que ezala approprié mpo na ba applications ya charge lourde, ya vitesse moke, lokola ba moteurs ya marine. Ba roulements à billes ya rainure profonde ezali na ba rainures continues na kati ya ba bagues ya kati mpe ya libanda, na ba boule oyo ekabolami ndenge moko na kati ya cage. Bakoki kozua charge dynamique ya jusqu'à 14 kN (par exemple, 6205 roulements), pe formule ya vie ya service ya L10=(C/P)^3. Ntango ozali kopona roulement, kanisá nzela ya charge, mbangu (ba roulements ya contact angulaire ebongi mpo na mbangu oyo eleki 20.000 rpm), mpe makambo ya zingazinga (ba environnements corrosifs esengaka ba roulements ya acier inoxydable).