Abearingyog atshuab elementuas txwv tus txheeb ze zog rau tsuas yog qhov xav tau, thiab txokev sib txhuamnruab nrabtxav qhov chaw. Kev tsim ntawm cov kabmob tuaj yeem, piv txwv li, muab pub dawbkab tawmtxav ntawm qhov txav los yog dawbrotation nyob ib ncig ntawm lub axis ruaj; los yog, nws yuavtiv thaivib tsab ntawv tsa suab los ntawm kev tswj covcov duabntawmib txwm muaj zoguas dais ntawm qhov txav. Feem ntau cov bearings pab txhawb txoj kev xav tau los ntawm kev sib txhuam kom tsawg. Bearings raug faib dav raws li hom kev ua haujlwm, cov lus tsa suab tso cai, lossis rau cov lus qhia ntawm cov loads (forces) siv rau qhov chaw.
Txog tam sim no, feem ntau cov kabmob yog covdawb bearing, ib tug bearing uas siv qhov chaw hauv kev sib cuag, feem ntau nrog aroj nplua nyeemxws li roj los yog graphite. Ib tug dawb bearing tej zaum yuav los yog yuav tsis yogtsis paub meejntaus ntawv. Tej zaum nws yuav tsis muaj dab tsi ntau tshaj li qhovbearing ntontawm ib lub qhov nrog ib tug ncej hla nws, los yog ntawm ib tug planar nto uasdaislwm tus (nyob rau hauv cov ntaub ntawv no, tsis yog ib tug discrete ntaus ntawv); los yog nws yuav yog ib txheej ntawmbearing hlautog twg los fused rau lub substrate (semi-discrete) los yog nyob rau hauv daim ntawv ntawm ib tug cais lub tes tsho (discrete). Nrog rau cov lubrication uas tsim nyog, cov bearings dawb feem ntau muab tag nrho qhov tseeb, lub neej, thiab kev sib txhuam ntawm tus nqi tsawg. Yog li ntawd, lawv tau siv dav heev.
Txawm li cas los xij, muaj ntau daim ntawv thov uas muaj cov kabmob uas tsim nyog tuaj yeem txhim kho kev ua tau zoo, raug, kev pabcuam sijhawm, kev ntseeg siab, kev ua haujlwm ceev, qhov loj me, qhov hnyav, thiab cov nqi ntawm kev yuav khoom thiab kev ua haujlwm ntawm cov tshuab.
Yog li, muaj ntau hom bearings, nrog rau qhov sib txawv, cov khoom siv, lubrication, lub hauv paus ntsiab lus ntawm kev ua haujlwm, thiab lwm yam.
Muaj tsawg kawg yog 6 hom kabmob,[14]txhua tus ua haujlwm ntawm cov ntsiab cai sib txawv:
Plain bearing, muaj ib tug ncej rotating nyob rau hauv ib lub qhov. Muaj ntau ntau yam tshwj xeeb: bushing,phau ntawv bearing, lub tes tsho bearing, phom bearing,composite bearing;
Rolling-element bearing, nyob rau hauv uas dov ntsiab muab tso rau nruab nrab ntawm txoj siav thiab nyob ruaj ruaj haiv neeg tiv thaiv zawv zawg kev sib txhuam. Muaj ob hom loj:
Pob bearing, nyob rau hauv uas cov ntsiab lus dov yog spherical pob;
Cov menyuam bearing, nyob rau hauv uas cov ntsiab lus dov yog cylindrical, taper lossis spherical rollers;
Jewel bearing, ib tug dawb bearing nyob rau hauv uas ib tug ntawm cov kabmob nto yog ua los ntawm ib tug ultrahard glassy jewel khoom xws lisapphiretxo kev sib txhuam thiab hnav;
Kua dej bearing, ib qho kev sib cuag tsis sib cuag uas cov load txhawb nqa los ntawm cov pa roj lossis kua (piv txwv lihuab cua bearing);
Sib nqus bearing, nyob rau hauv uas lub load yog txhawb los ntawm amagnetic teb;
Flexure bearing, nyob rau hauv uas cov lus tsa suab yog txhawb los ntawm ib tug load caij uas khoov.