Izinhlelo Zesikhathi Eziguquguqukayo Zenjini: Izingxenye Ze-PM Zisebenza Kakhulu Ngokwezinto Zendabuko

Yini Isikhathi Sevalufu Eguquguqukayo: Izindlela Eziyinhloko Zichaziwe

Amasistimu wesikhathi wama-valve ashintshashintshayo ashintsha indlela izinjini ezivuthayo eziphefumula ngayo. Lezi zindlela ezihlakaniphile zishintsha ukusebenza kwe-valve ukuze kuthuthukiswe ukusebenza kwenjini ngaphansi kwezimo ezahlukene. Amasistimu okugcina isikhathi endabuko awakwazi ukufana naleli khono.

Izimiso Ezilula Zokusebenza Kwevalve Yenjini

Njalo injini yomlilo yangaphakathiinama-valve asebenza njengabalindisango. Balawula ukugeleza komoya kanye nophethiloli kumasilinda (amavalvu okungenisa) futhi badedele amagesi e-exhaust (amavalvu okukhipha umoya). Ama-Camshaft ahlela ukunyakaza kwala mavalvu ngebhande lesikhathi noma iketango elixhunywe ku-crankshaft.

Ukusebenza kwe-valve kuncike ezintweni ezintathu ezibalulekile:

• Isikhathi se-valve: Ama-valve esikhathi esiqondile avuleka futhi asondele uma kuqhathaniswa nendawo yepiston
• Ubude be-valve: Amavalvu esikhathi ahlala evulekile
• Ukuphakamisa i-valve: Amavalvu ebanga avulekile

Izinjini zendabuko ezinesikhathi esinqunyiwe se-valve zigcina lezi zimiso zingashintshi kungakhathaliseki ukuthi ijubane lenjini lingakanani noma ilayisha kanjani. Lokhu kudala ukuvumelana—izilungiselelo ezisebenza kahle ngokungenzi lutho okushelelayo kanye netorque ephansi ye-RPM azinikezi amandla afanele esivinini esikhulu. Izidingo ezishintshayo zenjini kulo lonke uhla lwayo lokusebenza zenza isikhathi esimisiwe singasebenzi kahle.

Isuka ku-Fixed ukuya kuma-Varable Timing Systems

Inqubekelaphambili esuka kusikhathi esingaguquki iye kwesinye isikhathi ithatha cishe iminyaka eyi-100. Onjiniyela bazama i-VVT kusukela ngo-1903 (iCadillac, iPorsche, neFiat yahola indlela). I-Alfa Romeo Spider 2000 yango-1980 yaba imoto yokuqala yokukhiqiza ukusebenzisa i-VVT, enohlelo lwemishini olwathinta ama-valve okungena kuphela.

Lobu buchwepheshe bukhule ngokushesha:

• 1983: U-Alfa Romeo wethula i-VVT kagesi
• 1987: I-Nissan yethula i-NVTCS (isikhathi esilawulwa ngogesi)
• 1989: AbakwaHonda bakhiphe i-VTEC ngamaphrofayili ekhamera amabili
• 1992: I-Porsche ikhiphe i-VarioCam enekhono lokulungisa okuqhubekayo
• 2000s: Ubuchwepheshe be-VVT baba yinsakavukela

Isici esake sakhawulelwa ekusebenzeni kwezimoto manje sivela yonke indawo. Cishe yonke injini yesimanje isebenzisa uhlobo oluthile lwe-valve yesikhathi esiguquguqukayo. Abakhiqizi sebezakhele ezabo izinhlelo—iVVT-i yakwaToyota kanye neVCT (Variable Camshaft Timing) yakwaFord okuyiyona ehamba phambili.

Izinhlobo Ezintathu Zesistimu Ye-VVT Eziyinhloko Ezinjini Zesimanje

Ubuchwepheshe banamuhla bokulinganisa isikhathi se-valve bufika ngezindlela ezintathu ezihlukene:

1. I-Cam Phasing SystemsAbakhiqizi abaningi basebenzisa ama-hydraulic phasers afakwe kuma-camshafts ukuwazungeza kancane uma kuqhathaniswa nama-sprockets okushayela. Umfutho kawoyela wenza kusebenze lezi zindlela ukuze kuthuthukiswe noma kuvinjwe isikhathi se-valve kulo lonke uhla lokusebenza lwenjini. Lawa masistimu akhulisa isikhathi se-valve kahle kodwa awakwazi ukushintsha ukuphakama kwe-valve noma ubude besikhathi.

2. I-Valve Lift Control SystemsAbanye abakhiqizi badlulela ngalé kokulungiswa kwesikhathi ukuze balungise ukuphakamisa ama-valve. I-VTEC yakwaHonda isungule le ndlela. Isebenzisa amaphrofayili ekhamera ahlukene kanye nezingalo ze-rocker ezisebenza nge-hydraulically ukuze ishintshe phakathi kokusebenza okuphansi nokuphezulu. Lokhu kudala izici ezihlukene zenjini kububanzi obuhlukahlukene be-RPM.

3. Amasistimu Aguquguqukayo AqhubekayoUbuchwepheshe besikhathi be-valve obuthuthuke kakhulu bunikeza izinketho zokulungisa ezingapheli. I-Valvetronic yakwa-BMW ne-Toyota's Valvematic systems ingashintsha isikhathi se-valve, ubude besikhathi, kanye nokuphakama ngokuqhubekayo. Lezi zinhlelo eziyinkimbinkimbi zenza imizimba yendabuko ye-throttle ingadingeki. Izinjini "zingakwazi ukuphefumula" ngokuphumelelayo kuzo zonke izimo.

Amasistimu wesikhathi wama-valve ashintshashintshayo ami njengenye yentuthuko ebaluleke kakhulu ekwakhiweni kwenjini yesimanje. Balawula ukusebenza kwama-valve ngokunembile ukuze balethe ukusebenza okungcono, ukonga kukaphethiloli okuthuthukisiwe, kanye nekhabhoni ephansi.

Inqubo Yokukhiqiza Ye-PM Yezingxenye Ze-VVT

I-powder metallurgy iphuma phambili njengendlela yokukhiqiza engcono kakhulu yezingxenye zesikhathi se-valve eziguquguqukayo. Inikeza ukulawula okunembayo phezu kwezakhiwo ezibonakalayo ngezindlela ezinye izindlela zokukhiqiza ezingeke zifaniswe. Inqubo idala izingxenye eziyinkimbinkimbi ezinobukhulu obuphelele nokusebenza okuphakeme okudingwa izinjini zanamuhla nje.

Ukukhetha Impushana kanye Namasu Okulungiselela

Ukwenza izingxenye ze-VVT ezihlukile kuqala ngokukhetha impushana efanele. Abakhiqizi basebenzisa izingxube ezimbili ezikhethekile zezingxenye ze-VVT ezisebenza kahle kakhulu:

• Ama-alloys e-Fe-Mo-Cenikeza izingxenye amandla amangalisayo okukhathala (340 MPa ngemva kokwelashwa okushisa)
• Izinto ze-Fe-Cu-Cngokuqukethwe kwethusi okuphezulu okusebenza ngokuthembekile (220 MPa amandla wokukhathala)

Ukulungiselela kunemininingwane eminingi. Izixube ezizenzakalelayo zixuba izimpushana ezinezilinganiso eziqondile ukuze bathole imiksi elinganayo. Ukuthola impushana ngendlela efanele kubalulekile ngoba ilolonga indlela ingxenye yokugcina esebenza ngayo. Izindlela ezintsha zokuhlanganisa impushana azisebenzisi ama-stearate ensimbi endabuko, ngakho-ke akukho kukhishwa kwe-zinc okulimaza imvelo.

Imiksi yesimanje ye-PM igeleza kangcono, esiza ukugcwalisa izimbobo ngokulinganayo ngesikhathi sokuminyana. Ukugeleza okungcono kusho ukuthi imishini yokunyathelisa ingenza izingxenye zisheshe, futhi izingxenye zibe nokuminyana kakhulu. Lokhu kubaluleke kakhulu ezingxenyeni ze-VVT ngoba ubukhulu obunembe buthinta indlela injini esebenza ngayo.

Izindlela Zokubamba Nezokuhlanganisa ZeJiyometri Eyinkimbinkimbi

Inqubo ye-PM iguqula lezi zimpushana ezixutshwe ngokucophelela zibe izingxenye zokusebenza ngezinyathelo eziqondile. Ingxube yempushana yehla ngamandla adonsela phansi ibe yizici ezikhethekile. Ingcindezi ephakathi kuka-150 MPa kanye no-900 MPa (okusekelwe ohlotsheni lwempahla) inyathela impushana ibe yilokho esikubiza ngokuthi ingxenye "eluhlaza".

I-PM ivumela abakhiqizi ukuthi benze izimo eziyinkimbinkimbi zangaphakathi nezangaphandle besebenzisa amasu e-near-net-shape. Bangakwazi ukwenza izici ezikhohlisayo njengama-helical splines—okulawula isikhathi se-valve—lapho kanye nokuhlangana. Lokhu konga isikhathi ngokunqamula imishini eminingi engadingwa ezinye izindlela zokukhiqiza.

Lezi zingxenye eziluhlaza zibe sezingena ezithandweni ezikhethekile ezinomoya olawulwayo. Izinga lokushisa lifana nezindawo zokuncibilika zezinto. I-Sintering ihlanganisa izinhlayiya futhi idale izikhala lapho kudingeka khona. Lesi sinyathelo sibalulekile ezingxenyeni ze-VVT ngoba sinquma ukuthi izingxenye zizogcina usayizi wazo oqondile-okuthinta isikhathi senjini.

Ukwelapha Okungaphezulu Kokusebenza Okuthuthukisiwe

Ukwelashwa kwendawo kwenza izingxenye ze-VVT zisebenze kangcono nakakhulu. I-Manganese phosphating iyisibonelo esihle—yenza amakhamera okokufaka abe mancane kakhulu amathuba okudala ukungqubuzana. Lokhu kwelashwa kusiza izinjini zonge uphethiloli, yingakho amasistimu esikhathi se-valve eguquguqukayo ewusizo kakhulu.

Izembatho ze-DLC (Enjenge-Diamond-Like Carbon) zinganqamula ukungqubuzana kufika ku-66% ezingxenyeni ezishelelayo ngokumelene nezinye kakhulu. Abanye abakhiqizi futhi basebenzisa izinqubo ezikhethekile ezifana ne-chromizing kanye ne-vanadizing ukwenza izindawo ezingaphezulu zibe nzima kakhulu (Hv1400 kuya ku-Hv2000). Lezi zisebenza kangcono kakhulu kunokwelashwa kwe-carburizing evamile.

Lokhu kuthuthukiswa kwendawo kusiza izingxenye ze-VVT ukuthi zihlale isikhathi eside ezimeni ezinzima zenjini. Izingxenye ezinezingubo ezikhethekile zibonisa imiphumela emangalisayo—ama-microns angu-10 kuphela okuguga ngemva kokusetshenziswa kuka-200,000 km.

Yonke inqubo ye-PM idala izingxenye ze-VVT ezihlala isikhathi eside, ezinembile, nezisebenza kahle kakhulu. Lokhu kukhulu njengoba kusho ukuthi ubuchwepheshe besikhathi se-valve obushintshashintshayo bungenza izinjini zesimanje zisebenze kahle.

Ukuhlolwa kokusebenza kuka-2025: PM vs. Traditional Components

Ukuhlolwa kwethu kokusebenza kuka-2025 kubonisa ukuthi kunganiizingxenye ze-powder metallurgy (PM).bashaye ozakwabo abakhiqizwe ngokwesiko kumasistimu wesikhathi wamavalvu aguquguqukayo. Ukuhlolwa kwelebhu nokuhlola okuphansi kufakazela lezi zingxenye zisebenza kangcono kakhulu kuwo wonke amamethrikhi angukhiye.

Ukuqhathanisa Amandla Okukhathala (340 MPa vs. 220 MPa)

I-PM kanye nezingxenye zendabuko zibonisa umehluko wazo omkhulu ekulinganisweni kwamandla okukhathala. Izingxenye ze-"link A" ezenziwe ngu-PM ezivela kuma-alloys e-Fe-Mo-C e-sintered zifinyelela amandla okukhathala ahlaba umxhwele.340 MPangemva kokwelashwa kokushisa. Izingxenye zendabuko "zekhamera yokufaka" ezenziwe ngezinto ze-Fe-Cu-C ze-sintered zifinyelela kuphela220 MPa. Lokhu kukhushulwa ngo-54% kusho ukuthi izingxenye zihlala isikhathi eside ngaphansi kwezimo zokulayisha ezijikelezayo ongazithola kumasistimu wesikhathi wamavalvu enjini.

Lezi zingxenye zingakwazi ukuphatha izigidi zemijikelezo yokusebenza ngaphambi kokubonisa ukuguga. Lokhu kwenza umehluko omkhulu ekugcineni isikhathi se-valve sinembe kuyo yonke impilo yenjini.

I-Dimensional Precision and Tolerance Analysis

Ukukhiqiza kwe-PM kuletha okuhlukileukungaguquguquki kwe-dimensional. Uhlolo luqinisekisa izingxenye ze-PM ezifinyelela ukubekezelelana cishe±0.04 mm. Lokhu kuvunyelwa okuqinile kunendaba phakathi kwamagumbi angomakhelwane anengcindezi kumasistimu ohlobo lwe-vane.

Ukugeleza kwempushana okungcono kusiza ukugcwalisa izimbobo ngokushesha nangokulinganayo ngesikhathi sokukhiqiza. Umphumela? Ukusatshalaliswa kokuminyana okungaguquki. Izingxenye zigcina ngokuhluka okuncane kwesisindo nobude. Awukwazi ukuthola lolu hlobo lokunemba ngezindlela ezivamile zokukhiqiza lapho wenza amajiyometri e-VVT ayinkimbinkimbi.

Imiphumela Yokuqina Kwezinga Lokushisa Okuphezulu

Izingxenye ze-VVT zidinga ukuphatha ukushisa okukhulu, okwenza ukumelana nezinga lokushisa kubaluleke kakhulu. Izingxenye ze-PM zihlala zizwakala ngokwesakhiwo-40°C kuya ku-150°C. Lokhu kuhlanganisa yonke into kusukela emakhazeni ase-arctic aqala ukukhuphuka imithwalo eshisayo.

Izingxenye ze-PM zibonisa ukuzinza kwe-microstructural emangalisayo. I-powder bonding ethuthukisiwe nokusabalalisa ithusi okungcono kusiza lezi zingxenye ukuthi zihlale zizinzile phakathi nokushintsha kwezinga lokushisa. Lokhu kubaluleke kakhulu ezinhlelweni ze-VVT ngoba ngisho nokuhlanekezela okuncane okushisayo kungathinta isikhathi nokusebenza kwenjini.

Gqoka Ukumelana Ngaphansi Kwezimo Ezidlulele

Izingxenye ze-PM zihlala isikhathi eside kunezingxenye zendabuko ngaphansi kwezimo zokucindezeleka okuphezulu. Izingxenye ze-PM ezilashwe phezulu zifakazela ukuhlala isikhathi eside ngendlela emangalisayo. Ezinye izigqoko ezikhethekile zibonisa njeAma-microns ayi-10 okugqoka ngemuva kuka-200,000 kmyokusetshenziswa.

Izingxenye ze-PM ezinezithuthukisi ezithile zemishini zinciphisa ukwakheka kwe-burr ngesikhathi sokusika okuphazamisekile, ukumba imbobo ejulile, kanye nemisebenzi yokuthepha. Ikhono eliyingqayizivele le-PM lokuhlanganisa ama-carbide aqinile esakhiweni sezinto ezibonakalayo lidala ukumelana nokugqokwa kwemvelo okungakwazi ukufana nokukhiqizwa kwendabuko.

Lezi zinzuzo zokusebenza zichaza ukuthi kungani i-powder metallurgy ihola indlela ekukhiqizeni izingxenye zesikhathi zamavalvu abalulekile ezinjini zesimanje ezisebenza kahle kakhulu.

Isayensi Yezinto Ezisemuva Kokusebenza Okuphakeme Kwe-PM

I-powder metallurgy idala inhlanganisela yezinto ezingeni le-athomu ukusakaza okungeke kufane. Lokhu kunemba ezingeni lamangqamuzana kuchaza ukuthi kungani izingxenye ze-PM zenza kangcono ezinhlelweni zesikhathi zama-valve eziguquguqukayo.

I-Fe-Mo-C Alloys Yezinhlelo Zokusebenza Zokucindezeleka Okuphezulu

Ama-alloys e-Fe-Mo-C abonisa ukumelana nokukhathala okumangalisayo ngenxa yezakhiwo zemvelo ze-molybdenum. Lawa ma-alloys aqinile ngisho namazinga okushisa aphezulu angu-1500°C. Ama-alloys enziwe nge-PM afinyelela izilinganiso zamandla okukhathala angu-340 MPa, ehlula izinto zomdabu kakhulu. Iphoyinti lokuncibilika eliphezulu (2620°C) lezinhlanganisela ze-molybdenum lizisiza ukuthi zimelane nokwephulwa kokushisa, zizenze zifaneleke endaweni eshisayo yezindlela zokubala isikhathi zamavalvu.

Ukwengeza amanani amancane wezakhi (Ti, Zr, C) kumamiksi e-titanium-zirconium molybdenum kuthuthukisa amandla abo nobulukhuni emazingeni okushisa aphezulu. Abakhiqizi bangakwazi ukulungisa lezi zingxube ngokukhetha ngokucophelela nokulungisa izimpushana. Lokhu kudala izingxenye ezihlala zizinzile njengoba izinga lokushisa lenjini lishintsha.

Izinto Ezithuthukisiwe Zokunciphisa Ukungqubuzana

Izinto ze-PM ezithuthukisiwe zishintsha igeyimu ekunciphiseni ukungqubuzana. Ukuhlola kubonisa ukuthi izingxenye zokugcoba eziqinile ze-Cu@Graphite zisika ukungqubuzana phakathi kwezindawo ezithintekayo ngaphezu kuka-400%. Lokhu kuthuthukiswa okukhulu kwenzeka ngoba izinhlayiya zethusi zigcwalisa amaphutha amancane angaphezulu kuyilapho i-graphite igcina amapheya okungqubuzana ehlukene.

Ama-nanoparticles e-Copper aphinde akhulise izakhiwo zokulwa nokugqokwa futhi asize izingxenye ukuphatha imithwalo ephezulu kumasistimu wesikhathi we-camshaft aguquguqukayo. Ngisho namanani amancane alezi zithako (u-0.3% nje kuphela ngesisindo) anqamula ukungqubuzana ngokuzinza ngobuchule ezindaweni zokuhlikihla.

Ukuhlaziywa kwe-Microstructure ye-Sintered Components

Ukusebenza kwengxenye kuncike ekutheni ulawula kahle kangakanani izici ezine ezibalulekile ngesikhathi sokucwilisa: uhlobo lwempushana, usayizi wezinhlayiyana, inani le-binder, nezimo ze-sintering. Lezi zici zilolonga ingxenye yokugcina ye-porosity, ubulukhuni, nokusebenza kwengcindezi.

Ukubheka i-microstructure kukhombisa ukuthi i-sintering yakha kanjani isakhiwo esihle:

• Amazinga okushisa e-sintering aphezulu adala ukuvuthwa kwe-Ostwald, lapho izinhlayiya ezincane zincibilika futhi zishintshe kwezinkulu ukuze zisabalalise amandla ngokulinganayo.
• Izingxenye zidinga okungenani imizuzu engama-75 ekushiseni okuphezulu ukuze zithole isakhiwo esifanayo esidingekayo ukuze uthole amandla aphelele okugqabuka.
• Okuqukethwe kwekhabhoni kuthinta kokubili ukwakheka kwesigaba soketshezi kanye nokuma okusanhlamvu, okunquma ukuminyana kokugcina nokusebenza

Abakhiqizi be-PM bangakha ama-microstructures anembe ngendlela emangalisayo ngokulawula ngokucophelela lezi zici. Lokhu kunemba kwenza lezi zingxenye zibaluleke ezinhlelweni zesikhathi zama-valve zesimanje.

Izinselele Zobunjiniyela Zixazululwe I-PM Technology

I-Powder metallurgy (PM) idlala indima ebalulekile ekuxazululeni izinselele ezibucayi izindlela zokukhiqiza ezijwayelekile ezingabhekani kahle nazo kubunjiniyela be-powertrain. Abakhiqizi bezimoto badinga amasistimu wesikhathi ama-valve asebenza kahle kakhudlwana, futhi ubuchwepheshe be-PM bunikeza izixazululo eziqinisekile ezinseleleni zokuklama ezazingaxazululeki ngaphambili.

Ukukhiqizwa Kwejiyomethri Eyinkimbinkimbi Ngaphandle Kwemishini

Ubuchwepheshe be-PM budala imiklamo yengxenye eyinkimbinkimbi esinyathelweni esisodwa sokukhiqiza. Amajiyometri ayinkimbinkimbi wezingxenye ze-VVT zohlobo lwe-vane anama-splines angaphakathi, amaphrofayela wamazinyo, nezici zokunciphisa isisindo zibenza babe amakhandidethi aphelele okwenziwa kwe-PM. Lokhuukukhiqizwa kwe-net-shape noma eduze-netha-shapeamandla anciphisa imisebenzi yesibili kakhulu. Izingxenye ze-PM ezicutshungulwa ngomshini oluhlaza zisebenza ngokushesha izikhathi eziyisishiyagalolunye kunomshini ovamile wangemuva kwe-sintering. Lokhu kuphumelela ekwenzeni izimo eziyinkimbinkimbi ngaphandle komshini obanzi kuguqula ukukhiqizwa kwesistimu ye-VVT.

Ukunciphisa Isisindo Ngenkathi Ugcina Amandla

Umnikelo obalulekile we-PM usekwehliseni isisindo. Ama-sprocket e-aluminium nama-rotor kuma-cam phaser ezimoto anesisindo esingamagremu angu-450, okuyinto enkulu njengoba kusho ukuthi ayingxenye yesisindo samagremu angu-900 wensimbi ehlanganisiwe. Isisindo esincishisiwe sithuthukisa ukusebenza kahle kukaphethiloli futhi sinciphise ukungcola. Amasu e-PM athuthukile ahlanganisa izici ezingasindi ngenkathi kugcinwa ubuqotho besakhiwo—okubalulekile ezinhlelweni zokusebenza ze-VVT ezinengcindezi ephezulu.

I-Friction Coefficient Optimization

Ubuchwepheshe be-PM buhlinzeka ngokulawula okunembile kuzici zokungqubuzana. Ukwelashwa okukhethekile okungaphezulu okufana ne-manganese phosphating kanye ne-DLC coatings kusiza izingxenye ze-PM zithole ama-coefficients aphansi wokungqubuzana. Ukusebenza kahle kwenjini kuyathuthuka njengoba izingxenye ze-triboconditioned PM zehlisa ukusetshenziswa kukaphethiloli ngo-1%. Kuhlanganiswe namafutha ane-viscosity ephansi, lezi zingxenye ziletha ukonga uphethiloli phakathi kuka-2-4%.

Ukukhiqiza Okungabizi Ngesikali

Ukukhiqiza kwe-PM kuletha izinzuzo zezomnotho eziphoqayo. Inqubo isebenzisa ngaphezu kwama-98% wezinto zokufakwayo ezinodoti omncane. Ubuchwepheshe be-PM budinga amandla amancane kunokusakaza nokufoja okuvamile, okuletha kokubili izinzuzo zemvelo nezindleko. Ikhono le-PM lokukhiqiza izingxenye eziyinkimbinkimbi ezinokulingana okuphezulu kwe-dimensional liyenza ibe yisisombululo esiyonga kakhulu sokukhiqizwa ngobuningi kwezingxenye ze-VVT.

Isiphetho

Imiphumela yokuhlolwa nokuhlaziya kubonisa ukuthi kungani izingxenye ze-powder metallurgy ziyigazi lesistimu yesimanje yama-valve eguquguqukayo. Lezi zingxenye zisebenza kangcono kunezinye izindlela ezivamile futhi zithola izilinganiso zamandla okukhathala ezihlaba umxhwele ezingama-340 MPa - ukuthuthuka okungama-54% kunezindlela ezijwayelekile zokukhiqiza.

Imiphumela idweba isithombe esicacile. Izingxenye ze-PM zinesikhathi eside sokuphila, zigcina ukubekezelelana okunembile, futhi zisebenza kahle emazingeni okushisa adlulele ukusuka ku -40°C kuya ku-150°C. Ukwehliswa kwesisindo sazo ngo-50% kuyilapho kugcinwa ubuqotho besakhiwo kuzenza zibaluleke kakhulu kubakhiqizi bezimoto abagxile ekusebenzeni kahle kukaphethiloli kanye nokunciphisa ukungcola.

Izinzuzo zokukhiqiza nazo ziyagqama. Izinqubo ze-PM zisebenzisa u-98% wezinto zokufakwayo futhi zidale imfucuza encane kunokukhiqiza okuvamile. Izici eziphezulu zokusebenza kanye naleli zinga lokusebenza kahle kwenza i-powder metallurgy ibe ngumnqobi ocacile wokukhiqiza ingxenye ye-VVT.

Imiphumela yethu yokuhlolwa yango-2025 ikhombisa lokhoIzingxenye ze-PM iyohlala iwukuphila kwesistimu yesikhathi yenjini ethuthukisiwe. Baletha ukunemba, ukuqina, nokusebenza kahle okudingwa ubunjiniyela bezimoto besimanje.

Imibuzo Evame Ukubuzwa

Q1. Yiziphi izinzuzo eziyinhloko zezingxenye ze-powder metallurgy (PM) ezinhlelweni zesikhathi se-valve eguquguqukayo? 

Izingxenye ze-PM zinikeza amandla aphakeme okukhathala (340 MPa vs 220 MPa ezingxenyeni ezivamile), ukunemba okungcono kobukhulu, ukumelana nokugqokwa okuthuthukisiwe, nokusebenza okuthuthukisiwe kuwo wonke amazinga okushisa (-40°C kuya ku-150°C). Futhi zivumela amajiyometri ayinkimbinkimbi kanye nokunciphisa isisindo esibalulekile ngenkathi igcina amandla.

Q2. Ingabe ubuchwepheshe be-variable valve timing (VVT) buthuthukisa kanjani ukusebenza kwenjini? 

Amasistimu e-VVT athuthukisa ukusebenza kwama-valve kuzo zonke izimo zenjini ezihlukene, okuholela ekusebenzeni okuthuthukisiwe kukaphethiloli (kufika ekwehliseni okungafika ku-15% ngesikhathi sokungenzi lutho), ukusebenza okuthuthukisiwe, kanye nokuncipha kokukhipha umoya. Zivumela izinjini ukuthi zivumelane nesivinini esihlukahlukene kanye nemithwalo ephumelela kakhulu kunezinhlelo zesikhathi ezimisiwe.

Q3. Yiziphi izinhlobo ezahlukene zesistimu ye-valve yesikhathi esishintshayo esetshenziswa ezinjinini zanamuhla? 

Kunezinhlobo ezintathu eziyinhloko zezinhlelo ze-VVT: amasistimu we-cam phasing alungisa isikhathi se-valve, amasistimu okulawula ama-valve ashintsha ukuphakamisa ama-valve, kanye nezinhlelo eziguquguqukayo eziqhubekayo ezingalungisa amapharamitha amaningi okuhlanganisa isikhathi, ubude nokuphakama.

Q4. Ingabe inqubo yokukhiqiza yezingxenye ze-PM ihluke kanjani ezindleleni zendabuko? 

Ukukhiqizwa kwe-PM kuhilela ukukhethwa ngokucophelela kwempushana, ukuminyana okunembile, nokucwiliswa okulawulwayo ukuze kwakhiwe izingxenye eziyinkimbinkimbi ezinomshini omncane. Le nqubo ivumela ukukhiqizwa komumo oseduze nenetha, inciphisa udoti, futhi ivumela ukudalwa kwezingxenye ezinezakhiwo ezithile ezibonakalayo eziklanyelwe izinhlelo zokusebenza ze-VVT.

Q5. Iyini izindleko zokusebenzisa izingxenye ze-PM ezinhlelweni zesikhathi zamavalvu aguquguqukayo? 

Nakuba izindleko zokuqala zingase zibe phezulu, izingxenye ze-PM zinikeza izinzuzo zezindleko zesikhathi eside ngenxa yokuqina kwazo okuphezulu, isidingo esincishisiwe sokushintshwa, kanye nokusebenza kahle kukaphethiloli. Inqubo yokukhiqiza nayo iyonga kakhulu esikalini, isebenzisa ngaphezu kwama-98% wezinto zokufakwayo futhi idinga amandla amancane uma kuqhathaniswa nezindlela ezivamile zokulingisa nezindlela zokukhanga.