Arolling-element bearing, tseem hu ua rolling bearing, yog cov kabmob uas nqa cov khoom thauj los ntawm kev tso cov khoom dov (xws li cov pob lossis cov menyuam) ntawm ob lub nplhaib sib tw hu ua kev sib tw. Kev sib txheeb ntawm cov kev sib tw ua rau cov ntsiab lus dov dov nrog me ntsis dov tsis kam thiab nrog me ntsis zawv zawg.
Ib qho ntawm qhov ntxov tshaj plaws thiab paub zoo tshaj plaws rolling-element bearings yog cov cav ntoo nteg rau hauv av nrog lub pob zeb loj loj rau saum. Raws li lub pob zeb rub, cov cav yob raws hauv av nrog me ntsis zawv zawg kev sib txhuam. Raws li txhua lub log tawm sab nraub qaum, nws tau txav mus rau pem hauv ntej qhov twg lub thaiv ces yob rau nws. Nws muaj peev xwm ua tau raws li qhov kev coj tus kheej los ntawm kev tso ob peb cwj mem los yog xaum rau ntawm lub rooj thiab muab ib qho khoom tso rau saum lawv. Saib "bearings" kom paub ntau ntxiv txog keeb kwm kev loj hlob ntawm bearings.
Rolling element rotary bearing siv lub ncej hauv qhov loj dua, thiab lub tog raj kheej hu ua "rollers" nruj nreem kaw qhov chaw nruab nrab ntawm cov ncej thiab lub qhov. Raws li tus ncej tig, txhua tus menyuam ua raws li cov cav hauv qhov piv txwv saum toj no. Txawm li cas los xij, txij li cov kabmob yog puag ncig, cov chais yeej tsis poob tawm hauv qab lub load.
Rolling-element bearings muaj qhov zoo ntawm kev lag luam zoo ntawm tus nqi, qhov loj me, qhov hnyav, nqa peev xwm, durability, raug, kev sib txhuam, thiab lwm yam. Lwm cov qauv tsim cov kabmob feem ntau zoo dua ntawm ib tus cwj pwm tshwj xeeb, tab sis tsis zoo nyob rau hauv feem ntau lwm yam cwj pwm, txawm hais tias cov kua dej muaj peev xwm qee zaum ua tau zoo ntawm kev nqa lub peev xwm, durability, raug, kev sib txhuam, kev sib hloov thiab qee zaum tus nqi. Tsuas yog cov bearings nkaus xwb yog siv dav li dov-element bearings. Cov khoom siv kho tshuab uas lawv tau siv dav yog - tsheb, kev lag luam, marine, thiab aerospace kev siv. Lawv yog cov khoom tsim nyog rau cov cuab yeej siv niaj hnub no. Rolling element bearing yog tsim los ntawm lub hauv paus ruaj khov uas tau tsim ntau txhiab xyoo. Lub tswvyim tau tshwm sim nyob rau hauv nws daim ntawv tseem ceeb nyob rau hauv Roman lub sij hawm; Tom qab lub sij hawm ntev tsis muaj zog nyob rau hauv Nruab Nrab Hnub nyoog, nws tau rov ua dua thaum lub sij hawm Renaissance los ntawm Leonardo da Vinci, tsim tsis tu ncua nyob rau hauv lub xyoo pua xya thiab kaum yim.
