Bearing keeb kwm kev loj hlob

Bearing yog ib feem tseem ceeb ntawm cov tshuab thiab khoom siv niaj hnub no. Nws lub luag haujlwm tseem ceeb yog txhawm rau txhawb nqa lub tshuab tig lub cev, txo cov kev sib txhuam coefficient thaum nws txav mus los, thiab xyuas kom meej tias nws qhov kev sib hloov raug (qhov tseeb). Daim ntawv thaum ntxov ntawm cov kab hluav taws xob cov kabmob yog tso ib kab ntawm cov ncej ntoo hauv qab ib kab ntawm daim phiaj. Niaj hnub nimno linear motion bearings siv tib lub hauv paus ntsiab lus ua haujlwm, tab sis qee zaum siv cov pob es tsis txhob chais. Qhov yooj yim tshaj plaws rotary bearing yog bushing bearing, uas tsuas yog ib tug Bush sandwiched ntawm lub log thiab lub qag. Qhov kev tsim no tom qab hloov los ntawm dov bearings, uas hloov cov thawj bushings nrog ntau cylindrical rollers. Txhua lub caij dov yog zoo li lub log sib cais.

Ib qho piv txwv ntawm cov kabmob thaum ntxov tau pom nyob rau ntawm lub nkoj Roman thaum ub ua rau xyoo 40 BC hauv Naimi Lake, Ltalis: lub pob ntoo tau siv los txhawb lub rooj sib hloov. Nws tau hais tias Leonardo da Vinci ib zaug tau piav qhia txog lub pob bearing nyob ib ncig ntawm 1500. Ntawm ntau yam tsis paub qab hau ntawm pob bearings, muaj ib qho tseem ceeb heev uas kev sib tsoo ntawm cov pob yuav ua rau muaj kev sib txhuam ntxiv. Tab sis qhov tshwm sim no tuaj yeem tiv thaiv tau los ntawm kev tso cov pob hauv cov tawb me me ib los ntawm ib qho. Nyob rau hauv lub xyoo pua 17th, Galileo tau piav qhia ntxov tshaj plaws ntawm "lub tawb pob" pob bearing. Thaum kawg ntawm lub xyoo pua 17th, British C. Wallo tau tsim thiab tsim cov pob bearings, thiab muab lawv tso rau hauv cov tsheb thauj mus los rau kev sim siv, thiab British P. Tsim nyog tau txais daim ntawv pov thawj rau pob bearings. Thawj cov kabmob dov nrog lub tawb kom muab tso rau hauv kev siv tau tsim los ntawm watchmaker John Harrison hauv xyoo 1760 los ua H3 chronograph. Thaum kawg ntawm lub xyoo pua kaum yim, German HR Hertz tau luam tawm ib daim ntawv ntawm kev sib cuag kev ntxhov siab ntawm pob bearings. Raws li lub hauv paus ntawm Hertz qhov kev ua tiav, R. Stribeck hauv lub teb chaws Yelemees, A. Palmgren hauv Sweden thiab lwm tus tau ua ntau qhov kev sim, uas tau pab txhawb kev txhim kho ntawm dov bearing tsim txoj kev xav thiab lub neej qaug zog. Tom qab ntawd, Russia tus NP Petrov tau siv Newton txoj cai lij choj ntawm viscosity los xam cov kabmob sib txhuam. Thawj patent ntawm lub pob groove tau txais los ntawm Philip Vaughan ntawm Carmarthen hauv 1794.

Xyoo 1883, Friedrich Fisher tau npaj siv cov tshuab tsim khoom tsim nyog los zom cov pob steel ntawm tib qhov loj thiab qhov tseeb roundness, uas tau tsim lub hauv paus rau kev lag luam bearing. British O. Reynolds tau ua qhov kev ntsuam xyuas lej ntawm Thor qhov kev tshawb pom thiab muab los ntawm Reynolds equation, yog li tso lub hauv paus rau hydrodynamic lubrication txoj kev xav.