Brake Pad Friction Coefficient thiab Khoom siv
Nres pads, tseem hu ua brake linings, yog cov ntaub ntawv sib txhuam uas nws lub luag haujlwm tseem ceeb yog tsim kev sib txhuam nrog lub ntsej muag ntawm lub nres nres thaum nres lub tsheb, yog li ua tiav lub zog nres. Yog li ntawd, nws yog ib qho tseem ceeb ntawm lub brake pad qauv. Qhov kev sib txhuam zoo yog qhov coefficient ntawm kev sib txhuam kev ua tau zoo ntawm cov pawm brakes thiab yog ib qho tseem ceeb qhia txog qhov zoo ntawm tus nres nres. Yog tias lub zog siv rau lub dav hlau kab rov tav txav mus rau 100kg cov khoom, lub zog sib npaug ntawm nws tus kheej qhov hnyav, piv txwv li cov coefficient ntawm kev sib txhuam ntawm cov khoom thiab hauv av yog 1, qhov coefficient ntawm kev sib txhuam ntawm lub nres nres yog dab tsi?
Lub coefficient ntawm kev sib txhuam ntawm cov brakes yog cov coefficient ntawm kev sib txhuam ntawm cov ntaub qhwv, uas muaj cov coefficient ntawm kev sib txhuam. Qhov siab dua qhov kev sib txhuam ntawm kev sib txhuam, qhov kev sib txhuam ntawm lub braking ntau dua, thiab lub tsheb tuaj yeem tau txais txiaj ntsig zoo dua los ntawm kev txo qis kev quab yuam ntawm kev txav ntawm lub siab. Nres kev ua tau zoo cuam tshuam los ntawm tus nres nres uas muaj cov coefficient ntawm kev sib txhuam uas siab dhau lossis qis dhau.
Yog tias cov coefficient ntawm kev sib txhuam loj dhau, tus nres yuav ua rau lub log tuav tshwm sim, los yog rhiab heev, kev nplij siab thiab kub tsis kam yuav tsis zoo; yog tias qhov coefficient ntawm kev sib txhuam tsawg dhau, yuav muaj qhov nres nres, uas tsis zoo, thiab nws yuav ua rau muaj kev hem thawj rau kev tsav tsheb. Kev sib txhuam coefficient ntawm cov pawm nres yog 0.3-0.4 nyob rau hauv ib txwm muaj.
Cia peb tham txog cov khoom sib txhuam ntawm cov pawm nres:
Feem ntau hais lus, cov ntaub ntawv sib txhuam ntawm cov ntaub thaiv npog muaj plaub yam tseem ceeb: cov ntaub ntawv yooj yim, cov ntaub ntawv sau, cov khoom siv ntxiv thiab cov fibers ntxiv. Qhov kev faib ua feem ntawm cov ntaub ntawv no txawv ntawm cov khoom mus rau cov khoom, nyob ntawm seb cov kev siv sib txawv thiab kev sib txhuam coefficients. Tsis tas li ntawd, cov ntaub ntawv sib txhuam siv rau cov chav sib txawv ntawm lub tsheb thiab rau cov disc nres qhov sib txawv ntawm cov khoom siv rau lub nruas nres. Rau cov brakes kev sib txhuam, kev tsim cov khoom sib txhuam yog qhov tseem ceeb dua. Tus txheeb ze proportions ntawm tus kheej cov khoom yog cuam tshuam los ntawm cov nyhuv braking, tsis kam hnav, kub tsis kam thiab lwm yam khoom ntawm lub nres nres.
Cov ntaub ntawv sib txhuam uas muaj nyob hauv khw niaj hnub no tuaj yeem muab faib ua plaub hom raws li cov khoom siv yooj yim. Asbestos, semi-metallic, low-metallic, thiab NAO ceramic formulations (ie, non-asbestos organic). Tom ntej no, peb yuav saib tshwj xeeb ntawm cov khoom sib txawv ntawm cov ntaub thaiv npog.
1. Asbestos formulation: tau raug txwv vim kev tiv thaiv ib puag ncig.
2. Semi-metallic blends: "Semi-metallic" blends siv 30-50% "hlau alloy" ua cov fiber ntau reinforcing thiab muab nws nrog ib qho tseem ceeb sib xyaw. Nws muaj qhov zoo ntawm cov cua sov kom zoo dua thiab zoo dua tshav kub attenuation. Txawm li cas los xij, vim lub siab hardness, nws yooj yim los tsim suab nrov.
3. Low-metal mix brake pads: "Low-metal" mix brake pads yog tsuas yog ua los ntawm tsawg dua 10% hlau thiab cov hlau tsis-ferrous li reinforcing fibers. Nws yog tus cwj pwm los ntawm kev nyuaj siab me ntsis, xis braking, siab braking rhiab heev thiab tsis tshua muaj suab nrov braking.
4. Ceramic formula: ceramic formula yog cov kev taw qhia tam sim no ntawm nres ncoo kev sib txhuam cov ntaub ntawv formula kev tshawb fawb thiab kev loj hlob. Ua ntej tsim cov ntaub ntawv asbestos, feem ntau yog iav fiber ntau, aramid fibers thiab lwm yam fibers (carbon, ceramic, thiab lwm yam) ua cov khoom siv ntxiv. Thiab ceramic formulations muaj zoo braking kev nplij siab, tsis tshua muaj suab nrov braking, lub neej ntev kev pab cuam, huv si thiab ntau environmentally phooj ywg. Txawm li cas los xij, vim yog cov khoom ntawm cov khoom siv nws tus kheej, lub zog nres yog qhov tsawg, feem ntau yog siv rau Japanese thiab Korean qauv. Nws tsis tsim nyog siv cov mis ntshiab ceramic rau lub cev hnyav xws li tsheb European thiab Asmeskas.
Nres pads, tseem hu ua brake linings, yog cov ntaub ntawv sib txhuam uas nws lub luag haujlwm tseem ceeb yog tsim kev sib txhuam nrog lub ntsej muag ntawm lub nres nres thaum nres lub tsheb, yog li ua tiav lub zog nres. Yog li ntawd, nws yog ib qho tseem ceeb ntawm lub brake pad qauv. Qhov kev sib txhuam zoo yog qhov coefficient ntawm kev sib txhuam kev ua tau zoo ntawm cov pawm brakes thiab yog ib qho tseem ceeb qhia txog qhov zoo ntawm tus nres nres. Yog tias lub zog siv rau lub dav hlau kab rov tav txav mus rau 100kg cov khoom, lub zog sib npaug ntawm nws tus kheej qhov hnyav, piv txwv li cov coefficient ntawm kev sib txhuam ntawm cov khoom thiab hauv av yog 1, qhov coefficient ntawm kev sib txhuam ntawm lub nres nres yog dab tsi?
Lub coefficient ntawm kev sib txhuam ntawm cov brakes yog cov coefficient ntawm kev sib txhuam ntawm cov ntaub qhwv, uas muaj cov coefficient ntawm kev sib txhuam. Qhov siab dua qhov kev sib txhuam ntawm kev sib txhuam, qhov kev sib txhuam ntawm lub braking ntau dua, thiab lub tsheb tuaj yeem tau txais txiaj ntsig zoo dua los ntawm kev txo qis kev quab yuam ntawm kev txav ntawm lub siab. Nres kev ua tau zoo cuam tshuam los ntawm tus nres nres uas muaj cov coefficient ntawm kev sib txhuam uas siab dhau lossis qis dhau.
Yog tias cov coefficient ntawm kev sib txhuam loj dhau, tus nres yuav ua rau lub log tuav tshwm sim, los yog rhiab heev, kev nplij siab thiab kub tsis kam yuav tsis zoo; yog tias qhov coefficient ntawm kev sib txhuam tsawg dhau, yuav muaj qhov nres nres, uas tsis zoo, thiab nws yuav ua rau muaj kev hem thawj rau kev tsav tsheb. Kev sib txhuam coefficient ntawm cov pawm nres yog 0.3-0.4 nyob rau hauv ib txwm muaj.
Cia peb tham txog cov khoom sib txhuam ntawm cov pawm nres:
Feem ntau hais lus, cov ntaub ntawv sib txhuam ntawm cov ntaub thaiv npog muaj plaub yam tseem ceeb: cov ntaub ntawv yooj yim, cov ntaub ntawv sau, cov khoom siv ntxiv thiab cov fibers ntxiv. Qhov kev faib ua feem ntawm cov ntaub ntawv no txawv ntawm cov khoom mus rau cov khoom, nyob ntawm seb cov kev siv sib txawv thiab kev sib txhuam coefficients. Tsis tas li ntawd, cov ntaub ntawv sib txhuam siv rau cov chav sib txawv ntawm lub tsheb thiab rau cov disc nres qhov sib txawv ntawm cov khoom siv rau lub nruas nres. Rau cov brakes kev sib txhuam, kev tsim cov khoom sib txhuam yog qhov tseem ceeb dua. Tus txheeb ze proportions ntawm tus kheej cov khoom yog cuam tshuam los ntawm cov nyhuv braking, tsis kam hnav, kub tsis kam thiab lwm yam khoom ntawm lub nres nres.
Cov ntaub ntawv sib txhuam uas muaj nyob hauv khw niaj hnub no tuaj yeem muab faib ua plaub hom raws li cov khoom siv yooj yim. Asbestos, semi-metallic, low-metallic, thiab NAO ceramic formulations (ie, non-asbestos organic). Tom ntej no, peb yuav saib tshwj xeeb ntawm cov khoom sib txawv ntawm cov ntaub thaiv npog.
1. Asbestos formulation: tau raug txwv vim kev tiv thaiv ib puag ncig.
2. Semi-metallic blends: "Semi-metallic" blends siv 30-50% "hlau alloy" ua cov fiber ntau reinforcing thiab muab nws nrog ib qho tseem ceeb sib xyaw. Nws muaj qhov zoo ntawm cov cua sov kom zoo dua thiab zoo dua tshav kub attenuation. Txawm li cas los xij, vim lub siab hardness, nws yooj yim los tsim suab nrov.
3. Low-metal mix brake pads: "Low-metal" mix brake pads yog tsuas yog ua los ntawm tsawg dua 10% hlau thiab cov hlau tsis-ferrous li reinforcing fibers. Nws yog tus cwj pwm los ntawm kev nyuaj siab me ntsis, xis braking, siab braking rhiab heev thiab tsis tshua muaj suab nrov braking.
4. Ceramic formula: ceramic formula yog cov kev taw qhia tam sim no ntawm nres ncoo kev sib txhuam cov ntaub ntawv formula kev tshawb fawb thiab kev loj hlob. Ua ntej tsim cov ntaub ntawv asbestos, feem ntau yog iav fiber ntau, aramid fibers thiab lwm yam fibers (carbon, ceramic, thiab lwm yam) ua cov khoom siv ntxiv. Thiab ceramic formulations muaj zoo braking kev nplij siab, tsis tshua muaj suab nrov braking, lub neej ntev kev pab cuam, huv si thiab ntau environmentally phooj ywg. Txawm li cas los xij, vim yog cov khoom ntawm cov khoom siv nws tus kheej, lub zog nres yog qhov tsawg, feem ntau yog siv rau Japanese thiab Korean qauv. Nws tsis tsim nyog siv cov mis ntshiab ceramic rau lub cev hnyav xws li tsheb European thiab Asmeskas.
