Keeb Kwm Kev Loj Hlob Ntawm Bearings

Daim ntawv thaum ntxov ntawm linear motion bearings yog muab ib kab ntawm cov ntoo rods nyob rau hauv ib kab ntawm pry daim hlau. Niaj hnub nimno linear motion bearings siv tib lub hauv paus ntsiab lus ua haujlwm, tab sis qee zaum cov khoom siv es tsis txhob chais. Qhov yooj yim tshaj plaws ntawm cov kabmob teb yog lub tes tsho bearing, uas tsuas yog ib lub tes tsho sandwiched ntawm lub log thiab qag. Qhov kev tsim no tau hloov tom qab los ntawm cov kabmob dov, uas hloov cov txheej txheem qub nrog ntau lub cylindrical rollers, txhua qhov dov lub luag haujlwm 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 ntawm Lake Nami hauv tebchaws Ltalis: lub pob ntoo tau siv los txhawb lub rooj sib hloov. Nws tau hais tias Leonardo da Vinci tau piav qhia txog hom pob bearing nyob ib ncig ntawm 1500. Ib qho ntawm ntau yam tseem ceeb ntawm cov pob bearings yog tias lawv tuaj yeem sib tsoo nrog ib leeg, 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 muab cov lus piav qhia ntxov tshaj plaws ntawm "cage mounted ball" pob bearings. Thaum kawg ntawm lub xyoo pua 17th, C. Warlow los ntawm Askiv tau tsim thiab tsim cov pob bearings, uas tau muab tso rau ntawm lub tsheb xa ntawv rau kev sim siv, thiab P. Tsim nyog los ntawm Askiv tau txais daim ntawv pov thawj rau pob bearings. Qhov ua tau zoo tshaj plaws dov bearing nrog lub tawb tau tsim los ntawm watchmaker John Harrison hauv 1760 los ua H3 teev meter. Thaum kawg ntawm lub xyoo pua 18th, HR Hertz los ntawm lub teb chaws Yelemees luam tawm ib daim ntawv ntawm kev sib cuag kev ntxhov siab nyob rau hauv pob bearings. Raws li lub hauv paus ntawm Hertz qhov kev ua tiav, R. Strerbeck los ntawm lub teb chaws Yelemees thiab A. Palmgren los ntawm Sweden tau ua ntau yam kev sim, pab txhawb rau kev tsim cov kev xav ntawm kev tsim thiab kev qaug zog lub neej suav rau dov bearings. Tom qab ntawd, NP Petrov ntawm Russia tau siv Newton txoj cai viscosity los xam cov kabmob sib txhuam. Thawj patent rau pob groove tau txais los ntawm Philip Vaughn ntawm Carson hauv 1794.
Nyob rau xyoo 1883, Friedrich Fisher tau thov kom siv cov tshuab tsim khoom tsim nyog los zom cov pob steel ntawm tib qhov loj thiab qhov tseeb roundness, tso lub hauv paus ntawm kev lag luam bearing. O. Reynolds los ntawm UK tau ua qhov kev ntsuam xyuas lej ntawm Thor qhov kev tshawb pom thiab muab los ntawm Reynolds equation, tso lub hauv paus rau txoj kev xav ntawm hydrodynamic lubrication.