Kuv puas tuaj yeem sib xyaw cov kua dej los ntawm cov tuam ntxhab sib txawv?
Hom dej nres thiab lawv cov yam ntxwv
Tam sim no, cov khoom siv dav siv ntau tshaj plaws yog cais raws li tus qauv ntawm US Department of Transportation (Department of Transportation). Luv luv rau DOT.
Raws li kev faib tawm no, ntau dua 95% ntawm tag nrho cov tsheb niaj hnub no siv ib qho ntawm cov kua hauv qab no:
- DOT-3;
- DOT-4 thiab nws cov kev hloov kho;
- DOT-5;
- DOT-5.1.
Cov kua dej hauv tsev "Neva" (zoo ib yam li muaj pes tsawg leeg rau DOT-3, feem ntau yog hloov kho nrog cov khoom ntxiv uas ua rau kom qhov chaw khov), "Rosa" (analogous rau DOT-4) thiab cov zoo li tau dhau los ua tsawg dua. Yog vim li cas rau qhov no yog qhov yuav luag universal hloov ntawm Lavxias teb sab manufacturers rau labeling raws li American tus qauv.
Ua tib zoo xav txog cov yam ntxwv tseem ceeb thiab thaj tsam ntawm cov dej nres saum toj no.
- DOT-3. Cov kua dej tsis tu ncua glycol. Nws yog tsuas yog siv nyob rau hauv txawv teb chaws tsheb tshaj 15-20 xyoo thiab nyob rau hauv VAZ classics. Muaj hygroscopicity siab (muaj peev xwm khaws cov dej hauv ntim). Qhov kub ntawm cov kua tshiab yog kwv yees li 205 ° C. Tom qab sib sau ntau tshaj 3,5% dej ntawm tag nrho cov kua ntim, lub boiling point poob mus txog 140 ° C. Cwj pwm nruj heev rau qee yam yas thiab roj hmab.
- DOT-4. Siv nyob rau hauv cov tsheb tshiab. Lub hauv paus yog polyglycol. Nws muaj kev tiv thaiv ntau dua rau kev nqus dej los ntawm ib puag ncig. Ntawd yog, nws kav ntev me ntsis (qhov nruab nrab, rau rau lub hlis lossis ib xyoos). Txawm li cas los xij, cov tshuaj ntxiv uas txo cov hygroscopicity thiab qib tshuaj aggression me ntsis thickened cov kua no. Ntawm -40 ° C, viscosity siab dua me ntsis dua lwm cov dej DOT. Qhov kub ntawm cov kua "qhuav" yog 230 ° C. Cov dej noo (ntau tshaj 3,5%) txo qhov kub ntawm 155 ° C.
- DOT-5. silicone kua. Tsis nqus dej noo los ntawm ib puag ncig. Qee qhov tsub zuj zuj ntawm noo noo yog ua tau nyob rau hauv daim ntawv ntawm condensate. Txawm li cas los xij, dej tsis sib xyaw nrog silicone puag thiab precipitates (uas tuaj yeem ua rau tsis zoo). DOT-5 kua yog chemically nruab nrab. Boils ntawm qhov kub tsis qis dua 260 ° C. Nws muaj fluidity zoo ntawm qhov kub thiab txias.
- DOT-5.1. Hloov kho rau cov tsheb ua si (los yog tsheb tshiab) glycol muaj pes tsawg leeg. Cov kua muaj viscosity tsawg heev. Nws tsuas yog boil tom qab dhau 260 ° C taw tes (ntawm 3,5% av noo, lub boiling point poob mus rau 180 ° C). Nws muaj kev tiv thaiv zoo rau qhov kub thiab txias.
Ob lub kua dej kawg tsuas yog siv yog tias qhov no raug txiav txim siab los ntawm lub tsheb cov lus qhia ua haujlwm. Cov kua dej no tuaj yeem cuam tshuam rau cov neeg tsav tsheb qub, qhov uas tsis tshua muaj viscosity tuaj yeem ua rau lub cev ua haujlwm tsis zoo thiab ua rau nres caliper thiab piston leaks.
Miscibility ntawm nres kua los ntawm ntau manufacturers
Tam sim ntawd hais txog qhov tseem ceeb: tag nrho cov kev xav ntawm cov dej nres, tshwj tsis yog rau DOT-5, tuaj yeem sib xyaw ua ke, tsis hais cov chaw tsim khoom. Nws yog cov chav kawm uas tseem ceeb, tsis yog cov chaw tsim khoom.
Variants nrog ntau lub hauv paus yog categorically incompatible nrog ib leeg. Thaum sib tov silicone (DOT-5) thiab glycol bases (lwm txoj kev xaiv), fractionation yuav tshwm sim nrog rau tag nrho cov tshwm sim. Vim lub heterogeneity, cov kua yuav hnov txawv txawv thaum rhuab thiab txias. Qhov tshwm sim ntawm kev tsim cov roj ntsaws hauv zos yuav nce ntau zaus.
Cov kua dej DOT-3, DOT-4 thiab DOT-5.1 tuaj yeem sib xyaw ua ke ib ntus. Tsuas yog nco ntsoov xyuas seb cov kua dej no puas tsim los ua haujlwm nrog ABS yog tias koj muaj lub kaw lus no. Yuav tsis muaj qhov tshwm sim tseem ceeb. Txawm li cas los xij, qhov no tuaj yeem ua tau tsuas yog hauv cov xwm txheej hnyav thiab rau lub sijhawm luv luv. Thiab tsuas yog thaum cov kua xav tau tsis muaj rau ib qho laj thawj lossis lwm qhov. Tab sis yog tias koj lub tsheb siv DOT-4 nres cov kua dej los ntawm lub Hoobkas, thiab nws muaj peev xwm yuav nws, koj yuav tsum tsis txhob txuag thiab coj pheej yig dua DOT-3. Nyob rau hauv lub sij hawm ntev, qhov no yuav ua rau kom ceev kev puas tsuaj ntawm lub kaw lus kaw lus lossis teeb meem hauv ABS system.
Tsis tas li, koj tsis tas yuav yuav qhov kim DOT-5.1 yog tias lub kaw lus tsis tsim rau nws. Nws tsis tsim nyog. Kev tsim roj av thiab nres nres tam sim ntawd yuav tsis tshwm sim yog tias lub kaw lus zoo. Txawm li cas los xij, qhov sib txawv ntawm yuav luag 2 zaug hauv qhov kub thiab txias viscosity tuaj yeem ua rau lub zog nres. Qhov no tshwm sim li cas? Ntawm qhov kub tsis zoo, roj hmab seals poob lawv elasticity. Ntawm cov tsheb tsim rau DOT-3 lossis DOT-4, cov kua kuj thickens proportionally. Thiab ib tug tuab "brake", yog hais tias nws ntws los ntawm cov muab hardened seals, ces nyob rau hauv ib tug me me npaum li cas. Yog tias koj sau cov viscosity tsawg DOT-5.1, ces nyob rau lub caij ntuj no koj yuav tsum tau npaj rau nws cov to. Tshwj xeeb tshaj yog nyob rau hauv hnyav frosts.
Ntau yam kev hloov kho ntawm DOT-4 (DOT-4.5, DOT-4+, thiab lwm yam) tuaj yeem sib xyaw ua ke yam tsis muaj kev txwv. Nyob rau hauv xws li ib tug tseem ceeb qhov teeb meem raws li cov muaj pes tsawg leeg ntawm tus brake kua, tag nrho cov manufacturers nruj me ntsis raws li cov qauv. Yog tias nws tau sau rau ntawm lub kaus poom tias nws yog DOT-4, tom qab ntawd, nrog kev zam me me, cov khoom sib xyaw yuav muaj cov khoom qub, tsis hais cov chaw tsim khoom. Thiab qhov sib txawv ntawm cov tshuaj muaj pes tsawg leeg yuav tsum tsis txhob cuam tshuam kev sib raug zoo ntawm txhua txoj kev.
