Nres kua. Tswb kuaj tau
Raws li kev tshawb fawb los ntawm Automotive Institute, plaub ntawm kaum DOT-4 nres cov kua dej tsis ua raws li cov qauv. Cov kua dej tsis zoo lengthens, thiab hauv qhov xwm txheej hnyav tuaj yeem ua rau lub tsheb tsis muaj peev xwm ua kom qeeb.
Lub Chaw Tshawb Fawb Cov Khoom Siv ntawm Lub Tsev Haujlwm Saib Xyuas Kev Thauj Mus Los tau sim qhov zoo ntawm DOT-4 nres cov kua dej nrov hauv khw Polish. Qhov kev soj ntsuam ua raws li kev ua tau zoo suav nrog kaum cov khoom siv tsheb nrov. Nws cov kws tshaj lij tau kuaj xyuas, suav nrog tus nqi kub kub thiab viscosity, i.e. parameters uas txiav txim siab qhov zoo ntawm cov kua.
- Cov txiaj ntsig kev sim tau pom tias plaub cov kua dej tawm ntawm kaum tsis tau raws li qhov yuav tsum tau teev tseg hauv tus qauv. Plaub cov kua dej tau pom tias qhov kub ntawm qhov kub yog qis dhau, thiab ob qho ntawm lawv yuav luag tag nrho evaporated thaum lub sij hawm kuaj thiab tsis pom kev tiv thaiv oxidation. Nyob rau hauv lawv cov ntaub ntawv, corrosion pits kuj tshwm sim nyob rau hauv cov ntaub ntawv kuaj, "hais Eva Rostek, tus thawj coj ntawm ITS Materials Research Center.
Qhov tseeb, kev siv cov kua dej tsis zoo no tuaj yeem ua rau muaj kev ncua deb thiab, hauv qhov xwm txheej hnyav, ua rau lub tsheb nres tsis tau.
Saib ntxiv: Daim ntawv tso cai tshiab
Nres dej poob nws cov khoom nrog lub hnub nyoog, yog li cov tuam txhab tsheb pom zoo kom hloov nws tsawg kawg ib zaug txhua ob mus rau peb xyoos. Txawm li cas los xij, kev tshawb fawb hauv 2014 tau pom tias 22 feem pua ntawm Cov neeg tsav tsheb Polish yeej tsis hloov nws, thiab 27 feem pua tau ua. tshuaj xyuas tsheb, nws muaj cai hloov tam sim ntawd.
- Peb yuav tsum nco ntsoov tias cov dej nres yog hygroscopic, i.e. absorbs dej los ntawm ib puag ncig. Cov dej tsawg dua, qhov siab dua qhov ntsuas kub thiab qhov ua haujlwm siab dua ntawm kev ua haujlwm. Qhov kub ntawm cov dej hauv chav kawm DOT-4 yuav tsum tsis txhob qis dua 230 ° C, thiab cov dej hauv chav kawm DOT-5 yuav tsum tsis txhob qis dua 260 ° C, qhia Eva Rostek los ntawm ITS.
Ua haujlwm zoo nrog cov kua dej zoo hauv lub cev ncav cuag lawv lub peev xwm hauv li 0,2 vib nas this. Hauv kev xyaum, qhov no txhais tau hais tias (xav tias lub tsheb khiav ntawm 100 km / h taug kev deb ntawm 27 m / s) uas braking tsis pib txog 5 meters tom qab siv lub nres. Nrog rau cov kua dej uas tsis ua raws li qhov yuav tsum tau ua, qhov kev ncua deb ntawm lub braking yuav nce mus txog 7,5 npaug, thiab lub tsheb yuav pib qeeb hauv tsuas yog 35 meters los ntawm lub sijhawm koj nias lub nres pedal!
Qhov zoo ntawm cov dej nres ncaj qha cuam tshuam rau kev nyab xeeb ntawm kev tsav tsheb, yog li thaum xaiv nws, ua raws li cov lus pom zoo ntawm cov tuam txhab tsheb thiab yuav tsuas yog ntim ntim.
Saib ntxiv: Renault Megane RS hauv peb qhov kev xeem
