SOP yematanho gumi yekuongorora masisitimu emabhureki emotokari dzekutengesa zvakakwana

Chinangwa uye Kukura kweSystem yeBrake SOP

Maitiro ekushanda akajairika (SOPs) emasisitimu emabhureki emotokari dzekutengeseranainoshanda sehwaro hwekugadzirisa ngarava dzinorema, kuderedza mutoro wepamutemo uye kudzivirira kutadza kushanda zvakanaka kwemakanika. Nekuti kusarongeka kwemabhazi kunogara kuchikonzera anopfuura 25% yemirairo yese yeOOS (OOS) panguva yekuongorora kwekutengeserana pamugwagwa, kuisa nzira yakaoma yekuongorora inotungamirirwa nedata hakugone kutaurirana kune vanofambisa ngarava. SOP yakarongeka inobvisa fungidziro dzekuongorora, ichiva nechokwadi chekuti tekinoroji yega yega inotevera kurongeka kwakafanana kwekuongorora, zvisinei neruzivo rwavo rwega.

Kuita ongororo yakazara yehurongwa hwemabhureki kunoda kupfuura kutarisa kwemaziso. Zvinoda kuongororwa kwakarongeka kwesimba remhepo, geometri dzezvinhu zvekukweshana, uye telemetry yemagetsi (ECU). Nekugadzirisa mafambiro aya ekuongorora, zvikepe zvemazuva ano zvinogona kuwana chiyero chekutadza kushanda chiri pasi pe2%, zvichipfuura zvakanyanya kukosha kweindasitiri ukuwo zvichivandudza mutengo wezvose zvevaridzi (TCO) zvezvikamu zvekukweshana nezvinokweshana.

Zvinangwa zvekuongorora

Chinangwa chikuru cheSOP iyi ndechekuona zvakarongwa kuti zvikamu zvisashande zvakanaka zvisati zvatyora mitemo yepamutemo kana kukanganisa simba rekumisa mota. Nekushandisa nzira yakajairika yekuongorora, protocol iyi ine chinangwa chekuvandudza hupenyu hwezvinhu zvinokakavadzana uyemavharuvhu emhepo, kuve nechokwadi chekugoverwa kwakaringana kwesimba remabhureki kumativi ese emavhiri. Kubhureki kwakaringana kwakakosha kudzivirira zviitiko zvekupisa munzvimbo imwe chete—sekudzima kwemabhureki kana moto wevhiri—izvo zvinoitika kana ekisi imwe chete ikamanikidzwa kunwisa simba rekinetic risingaenzaniswi nekuda kwezvishandiso zvemagetsi zvisina kugadziriswa kune imwe nzvimbo pachassis.

Uyezve, SOP inoshanda senzira yekutevedzera mitemo. Chinangwa hachisi chekungogadzirisa zvikamu zvakatyoka chete, asi kugadzira gwaro rekuchengetedza rinodzivirirwa uye rinoongororwa. Magwaro aya anodzivirira ngarava kubva mukupomerwa kwekusateerera mushure mechiitiko uye anovimbisa kuti mota inoshanda zvakachengeteka pasi pehuwandu hwepamusoro hwehuremu hwakabatanidzwa (GCWR) panguva yekushanda kwakaoma.

Mota nemabhureki zvinofukidzwa

Iyi nzira inosanganisira mota dzese dzekutengesa (CMVs) dzine Gross Vehicle Weight Rating (GVWR) inodarika mapaundi 26,000. Izvi zvinosanganisira matrakita eClass 7 neClass 8 ane mutoro mukuru, marori akaomarara, uye matrakita akatsetseka. Nekuti mhando dzemotokari dzinosiyana, SOP yakagadzirirwa kusaziva zvivakwa, ichipa nzira dzekuongorora dzakananga dzemhando nhatu huru dzemabraking ane mutoro mukuru: mabrakita eS-cam air drum,mabhureki edhisiki remhepo(ADB), uye magadzirirwo ehydraulic ane basa repakati nepakati.

Pamusoro pezvo, chinangwa ichi chinosvika kune zvigadzirwa zvemagetsi zvepamusoro zvinotonga mashandiro emazuva ano ekubhureka. SOP inobatanidza kuongororwa kwakadzama kweAnti-lock Braking Systems (ABS), Electronic Braking Systems (EBS), uye Electronic Stability Control (ESC) modules. Kufukidza masisitimu aya akabatana kunoita kuti mabhureki emakanika nema electronic controllers awo aongororwe sechishandiso chimwe chete, chakabatana chekuchengetedza kwete sezvikamu zvakaparadzana.

Mitemo uye Magadzirirwo

Kuongororwa kwemabhureki kwakasimba kunofanirwa kutsigirwa nemitemo yakasimba uye zvinodiwa nemugadziri wemidziyo yekutanga (OEM). Kutevedzera mitemo hakusi kungosungirwa pamutemo chete asi inzira yekutanga yekuchengetedzwa kwekushanda, inoda kuti mainjiniya vaongorore zvikamu zvichienderana nehukuru, kupisa, uye kumanikidzwa. Kushanda kunze kwezvinodiwa izvi kunounza matambudziko akakomba uye kunowedzera zvakanyanya daro rekumira.

Zvinodiwa zveMutemo uye miganhu yeOEM

MuNorth America, masisitimu emabhureki emotokari dzekutengesa anofanirwa kutevedzera Chikamu 393 cheFederal Motor Carrier Safety Administration (FMCSA), kunyanya chikamu 393.47, icho chinodzora mabhureki,zvigadziriso zveslack, uye zvinhu zvishoma zvekukweshana. Vaongorori vanofanirwa kushandisa zvakadzama Mutemo weCommercial Vehicle Safety Alliance (CVSA) Out-of-Service, unoti mota yekutengeserana inofanira kugadzikwa pasi kana 20% kana kupfuura yemabhureki ayo ebasa akaonekwa seasina kunaka. Zvisinei, bhureki rimwe chete risina kunaka pa steering axle rinoita kuti OOS iotomerwe otomatiki pasinei nehuwandu hwemabhureki.

Miganhu yepamutemo ishoma kwazvo, asi zvinodiwa neOEM zvinowanzo taura kuti panofanira kutsiva mota dzakasimba zvakanyanya kuti pave nechokwadi chekuti pane mukana wekuchengetedza panguva yekushanda. Semuenzaniso, nepo Type 30 standard stroke brake chamber ichisvika pamuganho wayo wepamutemo pa2.0 inches yekufamba kwepushrod, mitemo yekuchengetedza fleet inowanzoda kugadziriswa kana kutsiva otomatiki kana stroke ikapfuura 1.75 inches. Matekiniki anofanirwa kudzidziswa kuti azive musiyano uripo pakati pemuganho wepamutemo nemuganho wekuchengetedza fleet unorayirwa.

Zvinodiwa zvemabhureki emhepo, hydraulic, ABS, EBS, uye disc

Magadzirirwo akasiyana emabhureki anoda zvinodiwa zvakanyanya pakuongororwa. Masisitimu epneumatic anofanirwa kuongororwa kuti aone nguva yekuwanda kwemhepo; mitemo yenyika inorayira kuti kumanikidzwa kwesisitimu kunofanira kukwira kubva pa85 psi kusvika ku100 psi mukati memasekonzi makumi mana nemashanu paRPM yepamusoro yeinjini. Kune mabhureki edhisiki remhepo (ADB), mainjiniya vanofanirwa kutarisa ukobvu hwerotor—hunowanzo rasa pa37mm kuti pave nerotor itsva ye45mm—uye kuona kuti zvinhu zvekukweshana kwepad hazvidonhe pasi pe2.0mm (0.08 inches). Maitiro eABS neEBS anoda kusimbisa kuwanikwa kwevoltage yeECU, iyo inofanirwa kuchengetedza hushoma hwe9.5V kune masisitimu e12V ari mutoro.

Masisitimu emabhureki ehydraulic ari mumotokari dzeClass 7 anoda kuongororwa kwenzvimbo dzinofashaira mvura, hunyoro (hunofanira kuramba huri pasi pe3%), uye master cylinder vacuum assist integrity. Kune matrailer ane EBS, mitsetse yekutaurirana yemabhazi eCAN inofanira kuratidza 120 ohms chaiyo yekumisa resistance; chero kutsauka kunoratidza data link rakakanganiswa rinogona kunonotsa kushanda kwevharuvhu yepneumatic panguva yekumira kwekutya.

Maitiro Ekuongorora Mabhureki Ane Matanho Gumi

Kuongorora mabhureki zvakanaka kunoda nzira yakarongeka, nhanho nhanho yekubvisa zvisizvo zvekuongorora. Maitiro aya ane nhanho gumi anochinja zvine musoro kubva pakugadzirira kuchengetedzwa kwemota kusvika pakuyera kwakadzika kwemuchina, uye anoguma nekusimbisa mashandiro emota. Kunyatsotevedzera izvi kunodzivirira mainjiniya kuti vasatarise kudyidzana kwakakosha kwesubsystem.

Matanho 1–3: Kugadzika kwenzvimbo yemotokari uye kuchengetedzeka kwayo

Danho 1: Kupinda kweMotokari uye Kusafamba.Nyanzvi inofanira kusimbisa mota panzvimbo yakati sandara uye yakasimbiswa nekongiri. Mavhiri emota anofanira kuiswa zvakasimba kumberi nekumashure kwematayi e tandem axle. Mabhureki ekupaka anofanira kusunungurwa zvizere kuti pave nekuyera kwakarurama kwe slack adjuster uye kutenderera kwevhiri.

Danho rechipiri: Kuchenesa Sisitimu uye Kuongorora Dziva.Nyanzvi dzinofanira kubvisa mvura mumatangi emhepo nemaoko (tangi rakanyorova kutanga, rozotevera rekutanga nerechipiri) kuti dzitarise hunyoro, mafuta akasanganiswa, kana kusvibiswa kwe desiccant. Kuvapo kwemafuta kana mvura yakawandisa kunoratidza kuti air dryer ichakundikana kana compressor yarova.

Danho rechitatu: Kuongorora Kuona Kwepamusoro-soro.Famba-famba uchitenderera kuti uone kukuvara kuri pachena kwechimiro. Izvi zvinosanganisira kutsvaga mitsetse yemhepo yakaturikwa, maoko akatsemuka, kana kudonhedza kwemhepo kunonzwika kunopfuura kudonha kwe2 psi paminiti kunobvumidzwa pamotokari imwe chete.

Matanho 4–7: Zvikamu, kupera, uye kuyerwa

Danho rechina: Kuyera Zvinhu Zvinokweshana.Yera ukobvu hwebhureki kana kuti jira reshangu uchishandisa mageji akagadziriswa. Majira ebhureki edhiramu anofanira kudarika 0.25 inches pakati peshangu, ukuwo kutarisa nguva dzose mapatani asina kuenzana (kupfeka kwakatetepa) kunodiwa kuti uone mapini ecaliper slide akatorwa kana mabushing eS-cam akasungwa.

Danho rechishanu: Kusimba kweDrum neRotor.Ongorora madhiramu kuti aone kana achitarisa kupisa, kana kuti aone kana achicheka zvakadzika, kana kuti magadzirirwo acho akatsemuka. Macaliper anofanira kushandiswa kuona kuti madhiramu haapfuure dhayamita yepamusoro yekurasa (semuenzaniso, 16.120 inches yedhiramu remainchi 16.5). Marotor anofanira kuongororwa kuti aone kana paine lateral runout uye kuti pane thermal spotting here.

Danho rechitanhatu: Stroke uye Actuator Geometry.Yera kurova kwe pushrod uchishandisa system yakamanikidzwa kusvika pa 90 kusvika 100 psi. Iva nechokwadi chekuti angle ye slack adjuster kana ichienzaniswa ne pushrod iri pa 90 degrees kana bhureki rashandiswa zvizere kuti uve nechokwadi chekuti michina inobatsira zvakanyanya.

Danho rechinomwe: Pneumatic uye Hydraulic Circuitry.Ongorora mapombi ese ethermoplastic netambo dzesimbi dzakarukwa kuti uone kana dziri kukweshwa, kuputirwa, kana kuti dzakaiswa pachena. Chero tambo inoisa panjodzi yemuganhu wekumanikidzwa kana inoratidza kuyerera kwemhepo kusingadzoreki inofanira kutsiviwa nekukasika.

Matanho 8–10: Kuedzwa kwebasa uye kusimbiswa

Danho rechisere: Bvunzo yeKudonhedza Mvura Yakadzika.Kana sisitimu yemhepo yachajwa zvizere kusvika pa120 psi uye injini yadzimwa, isa mabhureki akazara, anoenderera mberi. Kudzikira kwesimba resisitimu hakufanirwe kudarika 3 psi paminiti yemagetsi ega ega, kana 4 psi paminiti yemotokari dzinobatanidza matractor nematrailer.

Danho rechi9: Kuongorora Matambudziko Emagetsi.Batanidza nechiteshi chekuongorora mota (9-pin J1939) uchishandisa chishandiso chinorema chekuongorora. Matekiniki anofanira kuverenga nekubvisa makodhi eABS/EBS ekare, kuongorora kuenderera mberi kwesensa yekumhanya kwevhiri, uye kuita bvunzo dze automated modulator valve actuation kuona kuti masolenoid ese ari kupfura nemazvo.

Danho regumi: Kusimbiswa Kwesimba.Ita bvunzo yeyadhi inoshanda zvishoma kana kushandisa dynamometer yebhureki rinotenderera pasi. Danho rekupedzisira iri rinosimbisa simba rebhureki rakaringana kumativi ese emavhiri, zvichiita kuti pasave nekudhonzwa kwemagetsi, kunonoka kushandiswa, kana kubudiswa kwemhepo zvishoma nezvishoma panguva yekuenzanisa.

Zvishandiso, Kuyera, uye Zvinyorwa

Kushanda kwekuongororwa kwemabhureki emotokari dzekutengesazvakabatana zvikuru nekunyatsorongeka kwezvishandiso zvinoshandiswa uye kuvimbika kwemagwaro anotevera. Kuvimba nekufungidzira kwemaonero emunhu hakugamuchirwi mukugadzirisa zvinhu zvakanyanya; mainjiniya vanofanirwa kushandisa michina yemetrology yakaganhurirwa uye maprotocol ekubika akajairika kuti vave nechokwadi chekuti zvinotevedzwa uye zvinoteverwa.

Mageji anodiwa uye maturusi ekuongorora

Midziyo yakakosha yemetrology yemakanika inosanganisira ma micrometer edhijitari ekukora kwerotor, ma micrometer emukati kana ma drum gauges akasarudzika edhayamita yemukati, uye ma Go/No-Go gauges akajairwa ekusimbisa kurohwa kwe pushrod. Zviratidzo zve dial zvine magadziko emagineti zvinosungirwa kuyera end-play ye wheel bearing uye rotor lateral runout. Runout yakawandisa—kazhinji chero chinhu chinodarika 0.002 inches—inokonzera brake judder yakanyanya uye kuora kwepad isati yakwana.

Panyaya yemagetsi, maturusi ekuongorora ane basa guru anokwanisa kushanda pamwe chete nemaitiro ebhazi eJ1939, J1708, uye CAN anodiwa. Maturusi aya anofanira kunge aine hunyanzvi hwekudzora mafambiro maviri kuti ashandise mavharuvhu eABS nemaoko, kuyedza mitsara yekutaurirana yeEBS trailer, uye kutora data reOEM fault iro maOBD-II scanners asingakwanise kuwana.

Nzira dzekuyera uye miganhu yebasa

Zviyero zvinofanirwa kutorwa zvakarongeka panzvimbo dzakasiyana-siyana kuti zvionekwe kana kusashanda zvakanaka kana kupisa kuchichinja. Semuenzaniso, ukobvu hwerotor hunofanira kuyerwa panzvimbo ina dzakaenzana dzakatenderedza denderedzwa, dzinenge 10mm mukati kubva kumucheto wekukweshana kwekunze kudzivirira muromo wakaora. Pakuyera kurovera kwakashandiswa, makanika anofanira kutara pushrod kumeso kwekamuri nemabhureki akasunungurwa, kuisa 90 kusvika 100 psi yemhepo inoshanda, uye kuyera daro kusvika kune chiratidzo chitsva.

Chero kutsauka kupi zvako kupfuura muganho webasa wakataurwa kunoda kugadziriswa nekukasika kana kutsiviwa kwechikamu. Matekiniki haafanirwe kuyerwa avhareji; kuyerwa kwakaipisisa pane chero chikamu kunoratidza mamiriro acho ekupasa/kukundikana.

Mafomu ekuongorora, mapikicha, uye mishumo yekodhi yezvikanganiso

Magwaro anodzivirira anodzivirira ngarava kubva pamhosva kana tsaona ikaitika uye anopa ruzivo rwakakosha rwema algorithms ekugadzirisa zvinhu zvinofanotaurwa. Matekiniki anofanira kuzadza mafomu ekuongorora edhijitari anorayira kuti zviyero zvenhamba zviitwe (semuenzaniso, kuisa '1.75 inches' pane kudzvanya bhokisi rekuti 'pass'). Humbowo hwemifananidzo yezvinhu zvakakanganisika, zvakaita sezvinhu zvakapwanyika kana mapombi akakuvara, hunofanira kutorwa kuburikidza nepiritsi uye hunobatanidzwa zvakananga kurongeka kwebasa redhijitari.

Uyezve, mishumo yese yekuongorora mafambiro emagetsi, kusanganisira makodhi ekare ezvikanganiso uye marogi emagetsi eECU, inofanirwa kuiswa muhurongwa hwekuchengetedza mafambiro emagetsi (CMMS). Kushandisa makodhi akajairwa eVehicle Maintenance Reporting Standards (VMRS) kunobvumira vatariri vezvikepe kutevedzera mafambiro chaiwo ekukundikana nekufamba kwenguva, zvichigonesa sarudzo dzinotungamirirwa nedata maererano nekutenga zvikamu uye kugadziriswa kweOEM spec.

Kuongororwa Kuwanda uye Kuwedzera

Kugadzira nzira yakanakisisa yekuongorora mabhureki kunoda kufamba kupfuura nguva yakatarwa uye kushandisa nzira inoshanduka yakagadzirirwa kushandiswa kwemotokari. Uyezve, nzira dzakajeka dzekusimudzira dzinofanirwa kugadzirwa kuti mainjiniya agone kumisa midziyo isina kuchengetedzeka pasina kupokana kwehutungamiriri, zvichiita kuti kumanikidzwa kwehupfumi kusapfuure miganhu yekuchengetedza michina.

Kuwanda kwemabasa, mutoro, nzvimbo, uye nzira

Nguva dzekuongorora dzinofanira kuenzaniswa zvichienderana nedanho rebasa remotokari, chimiro chemutoro, uye nzvimbo yekushanda. Matarakita ekufamba kwenguva refu, pamusoro pemugwagwa (OTR) anoshanda zvakanyanya munzira dzakatsetseka dzepakati penyika anosangana nekusashandiswa kwemabhureki mashoma pakiromita imwe neimwe uye angangoda kuongororwa kwakazara kwemabhureki epasi pemakiromita 25,000 kusvika 30,000. Zvisinei, system yepneumatic pamotokari idzi inofanira kuramba ichicheneswa uye ichitariswa nemaziso panguva yega yega yekuongorora usati waenda.

Kusiyana neizvi, mota dzebasa—dzakadai semarori emarara, mapuratifomu ematanda, kana mabhurugwa ekutakura zvinhu—dzinotsungirira kutenderera kwakasimba, mitoro inorema, uye nzvimbo dzinokwesha. Zvinhu izvi zvinoda kuongororwa kwakasimba, kwakazara kwese kwese makiromita 5,000 kusvika 10,000, kana kuti zvishoma pamwedzi. Mapoka engarava anofamba munzvimbo dzine makomo ane kudzikira kwenguva refu anofanirawo kuwedzera kuora kwekupisa, zvichiwedzera kuwanda kwekuongorora kwerotor, drum, uye caliper structure kudzivirira kutadza kunokonzerwa nekupisa.

Sarudzo dzekusimudzira nekugadzirisa mainjiniya

Kana ongororo ikaona kuti pane dambudziko riri kusvika kana kupfuura miganhu yemutemo, SOP inofanira kurayira nzira yakasimba, isina kujeka yekukwira mota. Matekiniki anofanira kunge aine simba rakazara rekukiya nekuburitsa (LOTO) mota yekutengeserana kana ikakonzera chero CVSA 20% defectious brake criterion. Hapana mota inosangana neOOS criteria inogona kutumirwa chero nguva.

Kune kusakara kwemusana—sekunge mabhureki ane 0.30 inches, izvo zviri pamutemo asi zvinosvika nekukurumidza pa0.25-inch—sisitimu iyi inofanira kukonzera kukwira kwemotokari otomatiki kune maneja wekugadzirisa. Izvi zvinobvumira ngarava kuronga kutsiva nekukurumidza pamberi pechirongwa chinotevera chekuchengetedza (PM), zvichideredza nguva isina kurongwa. Sarudzo dzekugadzirisa dzinofanira kugara dzichiisa pamberi pemakambani ekukweshana anotenderwa neOEM uyemavharuvhu emhepo akafananakuve nechokwadi chekuti torque yebhureki yakagadzirwa zvakanaka inochengetwa zvakanaka musanganiswa wese wetractor netrailer.

Zvinhu Zvinokosha Zvaunofanira Kuziva

• Shandisa nzira yakatarwa yekuongorora mabhureki kuitira kuti nyanzvi yega yega iongorore kumanikidzwa kwemhepo, kusakara kwekukweshana, kugadziriswa kwemuchina, uye kudzora kwemagetsi nguva dzose.
• Isa pamberi kuongororwa kwemabhureki nekuti zvikanganiso zvinokonzerwa nemabhureki zvinokonzera anopfuura 25% yeodha dzemotokari dzekutengesa dziri kunze kwemugwagwa.
• Isa SOP kumotokari dzinorema kupfuura mapaundi 26,000 eGVWR, kusanganisira matrakita eClass 7 neClass 8, marori ebasa, uye matrakita.
• Ongorora mabhureki eS-cam drum, mabhureki emhepo, masisitimu ehydraulic, ABS, EBS, uye ESC senzira imwe chete yekuchengetedza yakabatana pane zvikamu zvakasiyana.
• Chengetedza zvinyorwa zvekuongorora nekugadzirisa zvakajeka kuti utsigire kutevedzera mitemo, kuderedza mutoro, uye kuona kuti mota dzinoramba dzakachengeteka pasi pemamiriro ekushanda akanyanya kunaka eGCWR.
• Isa chinangwa chinoyerwa chemotokari, sekuchengetedza zvikanganiso zvemabhureki zviri kunze kwebasa pasi pe2%, kuti utarise kunaka kwekugadzirisa uye kuvandudza mari yese yekuva muridzi.

Mibvunzo Inowanzo bvunzwa

Masisitimu emabhureki emotokari dzekutengeserana anofanira kuongororwa kangani?

Masisitimu emabhureki anofanirwa kuongororwa panguva yega yega yekutarisa rwendo rwese rwepamberi nerwepashure perwendo, neongororo dzakadzama dzakarongwa zvichienderana nekufamba kwemotokari, makiromita, nhungamiro yeOEM, uye zvinodiwa nemitemo. Marori anotakura zvinhu zvakanyanya nematrailer anorema angada kuongororwa kakawanda.

Ndedzipi mota dzinoshandiswa pakuongorora mabhureki uku?

Inonyanya kushanda kumotokari dzekutengesa dzinorema kupfuura mapaundi zviuru makumi maviri nezvitanhatu (26,000 pounds) dzeGVWR, kusanganisira matrakita eClass 7 neClass 8, marori ebasa, uye matrakita anoshandisa mabraki eS-cam air drum, mabraki eair disc, kana masisitimu ehydraulic ane basa repakati.

Sei maitiro ekuongorora mabhureki akajairika achikosha?

SOP yakajairika inoderedza kufungidzira kwekuongorora, inoita shuwa kuti nyanzvi yega yega inotevera maitiro akafanana, inotsigira magwaro ekutevedzera mitemo, uye inobatsira zvikepe kuwana zvikanganiso zvemabhureki zvisati zvava kutyora mitemo kana kutadza kuchengetedzeka.

Ndezvipi zvikamu zvebhureki zvinofanira kuongororwa nemainjiniya?

Matekiniki anofanira kuongorora zvinhu zvekukweshana, madhiramu kana marotor, macaliper, makamuri, ma slack adjusters, mahosi, mavharuvhu emhepo, mavhiri emavhiri, ma master cylinders, uye masisitimu emagetsi akadai seABS, EBS, neESC kana akashongedzerwa.

Ndezvipi zvikonzero zvinowanzoita kuti mabhureki emotokari dzemabhizinesi asashande zvakanaka?

Kusagadzikana kwemabhureki kunogona kukonzerwa nezvigadziriso zvisingagadziriswi, zvinhu zvakasakara zvekukweshana, macaliper anonamira, mhepo inobuda, mabhureki asina kunaka, ma linings ane tsvina, kana matambudziko emavharuvhu anoita kuti mabhureki asashande zvakanaka pama axles.