Yav dhau los thiab tam sim no lub neej ntawm lub brake hauv ob sab phlu
Nres hauv ob sab phlu yog cov khoom siv hauv cov tshuab nres, xws li lub nruas nres thiab disc brakes ncoo siv hauv tsheb thauj khoom.
Keeb kwm
Nres linings tau tsim los ntawm Bertha Benz (tus poj niam ntawm Karl Benz uas tau tsim thawj lub tsheb patented) thaum nws keeb kwm thawj lub tsheb mus deb hauv ntiaj teb thaum Lub Yim Hli 1888. Thawj asbestos brake linings tau tsim nyob rau xyoo 1908 los ntawm Herbert Frood.
Cov qauv thiab kev ua haujlwm
Nres hauv ob sab phlu yog tsim los ntawm ib tug kuj mos tab sis tawv thiab kub-resistant cov ntaub ntawv uas muaj ib tug siab coefficient ntawm dynamic kev sib txhuam (thiab zoo tagnrho ib tug zoo tib yam coefficient ntawm zoo li qub kev sib txhuam) feem ntau mounted rau ib tug khoom hlau thaub qab siv high-temperature adhesives los yog rivets. Kev sib dhos ua tiav (nrog rau hauv ob sab phlu thiab nraub qaum) feem ntau hu ua nres nres lossis khau nres. Kev sib txhuam dynamic coefficient "µ" rau feem ntau cov qauv kev sib txhuam yog feem ntau nyob rau hauv thaj tsam ntawm 0.35 txog 0.42. Qhov no txhais tau hais tias lub zog ntawm 1000 Newtons ntawm qhov thaiv yuav muab lub zog nres ze li 400 Newtons. Muaj qee qhov kev sib tw sib tw uas muaj qhov siab heev µ ntawm 0.55 txog 0.62 nrog kev coj tus cwj pwm kub zoo heev. Cov ntaub qhwv no muaj cov ntsiab lus hlau siab thiab feem ntau yuav ua tau zoo dua lwm cov ntaub qhwv uas siv nrog cov hlau discs. Hmoov tsis tsis muaj dab tsi tuaj yeem dawb, thiab cov ntaub ntawv sib txhuam siab µ no hnav sai thiab tseem hnav cov discs ntawm tus nqi nrawm dua. Txawm li cas los xij lawv yog ib qho txiaj ntsig zoo rau lwm cov khoom kim dua.
Txij li thaum lub hauv ob sab phlu yog ib feem ntawm lub braking system uas hloov lub tsheb lub zog kinetic rau hauv tshav kub, lub hauv ob sab phlu yuav tsum muaj peev xwm ciaj sia nyob rau hauv lub kub kub yam tsis muaj hnav ntau heev (ua rau nquag hloov) los yog tawm gassing (uas ua rau lub brake ploj, ib tug txo nyob rau hauv cov kev hloov nyob rau hauv lub sij hawm). nres lub zog ntawm tus nres).
Vim nws txoj kev ua tau zoo, chrysotile asbestos feem ntau yog ib feem ntawm cov hlua nres. Txawm li cas los xij, cov kev tshawb fawb xws li xyoo 1989 National Institutes of Health cov khoom tau pom tias feem ntau tsis tshua muaj kev cuam tshuam ntawm cov neeg kho tshuab nres tau raug cuam tshuam nrog pleural thiab peritoneal mesothelioma, ob qho tib si txuas nrog chrysotile thiab asbestos raug. Cov neeg saib xyuas kev noj qab haus huv feem ntau pom zoo kom tsis txhob nqus cov plua plav, chrysotile tau raug txwv hauv ntau lub tebchaws tsim thiab tsim kho, xws li Australia, Tuam Tshoj thiab lwm yam nyob rau xyoo 2003, thiab chrysotile tau hloov zuj zus nyob rau hauv feem ntau cov brakes thiab thaiv los ntawm lwm cov fibers xws li hluavtaws aramids.
Kev tu
Thaum lub hauv caug plam tawm, lub nraub qaum lossis rivets yuav hu rau lub rotors lossis nruas thaum lub sijhawm braking, feem ntau ua rau muaj kev puas tsuaj uas yuav tsum tau rov ua dua lossis hloov cov nruas lossis rotors. Ib qho kev ntxhov siab squeal tshwm sim los ntawm kev ceeb toom tang yog qhov kev ceeb toom uas yuav tsum tau hloov pauv; Yog hais tias lub squeal tsis quav ntsej rau ntev dhau lawm, nruas lossis rotor puas (feem ntau nrog lub suab sib tsoo tsis zoo lossis hnov qab) yuav yog qhov tshwm sim.
