Sistimi ea Nako e Fetohang ea Enjene: Likarolo tsa PM li Feta Likarolo tsa Setso

Nako ea Li-valve e Fetohang ke Eng: Mekhoa ea Motheo e Hlalositsoe

Litsamaiso tsa nako tsa li-valve tse feto-fetohang li fetola tsela eo lienjineri tse tukang ka hare li hemang ka eona. Mekhoa ena e bohlale e fetola ts'ebetso ea valve ho ntlafatsa ts'ebetso ea enjene tlas'a maemo a fapaneng. Sistimi ea khale ea nako e behiloeng e ka se tsamaellane le bokhoni bona.

Melao-motheo e Bonolo ea Ts'ebetso ea Valve ea Enjene

Emong le emong enjene e tukang ka haree na le li-valve tse sebetsang joalo ka balebeli ba liheke. Ba laola moea le motsoako oa mafura ho phalla ka har'a li-cylinders (li-valve tsa ho noa) 'me li tlohella likhase tse tsoang ho tsoa (li-valve tsa exhaust). Li-Camshaft li hlophisa motsamao oa li-valve tsena ka lebanta la nako kapa ketane e hokeletsoeng ho crankshaft.

Ts'ebetso ea valve e itšetlehile ka lintlha tse tharo tsa bohlokoa:

• Nako ea valve: Nako e nepahetseng li-valve li bulehile 'me li haufi le boemo ba piston
• Nako ea valve: Li-valve tsa nako li lula li butsoe
• Phahamisa valve: Li-valve tsa sebaka li bulehile

Lienjineri tsa khale tse nang le nako e tsitsitseng ea li-valve li boloka liparamente tsena li sa fetohe ho sa tsotellehe hore na lebelo la enjene kapa boima ba lona ke bofe. Sena se baka ho sekisetsa - litlhophiso tse sebetsang hantle bakeng sa ho se sebetse hantle le torque e tlase ea RPM ha e fane ka matla a phahameng a lebelo. Litlhoko tse fetohang tsa enjene ho pholletsa le sebaka sa eona sa ts'ebetso li etsa hore nako e tsitsitseng e se sebetse hantle.

Tsoha ho tloha ho Fixed ho ea ho Variable Time Systems

Tsoelopele ho tloha ho nako e tsitsitseng ho isa ho e fapaneng e nka lilemo tse ka bang 100. Baenjiniere ba ile ba etsa liteko ka VVT khale koana ka 1903 (Cadillac, Porsche, le Fiat li ile tsa etella pele). 1980 Alfa Romeo Spider 2000 e bile koloi ea pele ea tlhahiso ea ho sebelisa VVT, e nang le mochine o amang li-valve tsa ho kenya feela.

Theknoloji ena e ile ea hola ka potlako:

• 1983: Alfa Romeo e ile ea hlahisa VVT ea elektronike
• 1987: Nissan e ile ea qala NVTCS (nako e laoloang ka elektronike)
• 1989: Honda e ile ea qala VTEC ka li-profiles tse peli tsa cam
• 1992: Porsche e ile ea lokolla VarioCam e nang le bokhoni bo tsoelang pele ba ho fetola
• 2000s: Theknoloji ea VVT e ile ea fetoha ntho e tloaelehileng

Karolo e kileng ea fella ka likoloi tse sebetsang hona joale e hlaha hohle. Hoo e ka bang enjene e 'ngoe le e' ngoe ea sejoale-joale e sebelisa mofuta o itseng oa nako ea li-valve tse fapaneng. Bahlahisi ba iketselitse litsamaiso tsa bona - VVT-i ea Toyota le VCT ea Ford (Variable Camshaft Timing) e etella pele pakete.

Mefuta e meraro e meholo ea VVT System ho Lienjineri tsa Kajeno

Theknoloji ea mehleng ea kajeno ea nako ea li-valve e tla ka mefuta e meraro e fapaneng:

1. Cam Phasing SystemsBaetsi ba bangata ba sebelisa li-hydraulic phasers tse behiloeng holim'a li-camshaft ho li potoloha hanyenyane ho latela li-sprockets tsa bona tsa koloi. Khatello ea oli e kenya tšebetsong mekhoa ena ho ntšetsa pele kapa ho khina nako ea li-valve nakong eohle e sebetsang ea enjene. Litsamaiso tsena li ntlafatsa nako ea li-valve hantle empa ha li khone ho fetola phahamiso kapa nako ea li-valve.

2. Litsamaiso tsa Taolo ea Phahamiso ea ValveBaetsi ba bang ba fetela ka nģ'ane ho liphetoho tsa nako ho fetola phahamiso ea li-valve. VTEC ea Honda e ile ea bula mokhoa ona. E sebelisa li-profiles tse arohaneng tsa cam le matsoho a rocker a hydraulically actuated ho chencha lipakeng tsa ts'ebetso e tlase le e phahameng. Sena se theha litšobotsi tse fapaneng tsa enjine mefuteng e fapaneng ea RPM.

3. Mekhoa e sa Feleng e Tsoelang PeleLitheknoloji tse tsoetseng pele ka ho fetesisa tsa nako ea li-valve li fana ka likhetho tse sa feleng tsa phetoho. Sistimi ea BMW's Valvetronic le Toyota's Valvematic e ka fapana nako ea li-valve, nako le ho phahama ho sa khaotse. Litsamaiso tsena tse tsoetseng pele li etsa hore 'mele oa setso oa throttle o se ke oa hlokahala. Lienjine li ka "phefumoloha" ka katleho maemong 'ohle.

Sistimi ea nako ea li-valve tse feto-fetohang e eme e le e 'ngoe ea likhatelopele tsa bohlokoahali moralong oa sejoale-joale oa enjine. Ba laola ts'ebetso ea li-valve ka nepo ho fana ka ts'ebetso e ntlafetseng, moruo o ntlafalitsoeng oa mafura, le mesi e tlase.

PM Manufacturing Process for VVT Components

Metallurgy ea phofo e hlahella e le mokhoa o motle ka ho fetisisa oa ho etsa lisebelisoa bakeng sa likarolo tse fapaneng tsa nako ea li-valve. E fana ka taolo e nepahetseng holim'a thepa ea thepa ka litsela tseo mekhoa e meng ea tlhahiso e ke keng ea lumellana. Ts'ebetso e theha likarolo tse rarahaneng tse nang le litekanyo tse phethahetseng le ts'ebetso e phahameng eo lienjineri tsa kajeno li hlokang feela.

Khetho ea Phofo le Mekhoa ea ho Lokisa

Ho etsa likarolo tse ikhethang tsa VVT ho qala ka ho khetha phofo e nepahetseng. Baetsi ba sebelisa metsoako e 'meli e khethehileng ea lisebelisoa bakeng sa likarolo tse phahameng tsa VVT:

• Lisebelisoa tsa Fe-Mo-Ce fanang ka likarolo tse matla tsa mokhathala o makatsang (340 MPa kamora kalafo ea mocheso)
• Lisebelisoa tsa Fe-Cu-Ce nang le lintho tse ngata tsa koporo tse sebetsang ka ts'epo (220 MPa matla a mokhathala)

Tokisetso e hlalositsoe haholo. Li-blenders tse ikemetseng li kopanya li-powders le litekanyo tse nepahetseng ho fumana motsoako o lekanang. Ho fumana phofo hantle ho bohlokoa hobane ho bopa hore na karolo ea ho qetela e sebetsa hantle hakae. Mekhoa e mecha ea ho kopanya phofo ha e sebelise li-stearate tse tloaelehileng tsa tšepe, kahoo ha ho na mesi ea zinki e ka senyang tikoloho.

Metsoako ea sejoale-joale ea PM e phalla hantle, e thusang ho tlatsa likheo ka ho lekana nakong ea compaction. Phallo e betere e bolela hore mecheso e ka etsa hore likarolo li potlake, 'me likarolo li na le ho teteana haholo. Sena se bohlokoa haholo bakeng sa likarolo tsa VVT hobane litekanyo tse nepahetseng li ama tsela eo enjene e sebetsang hantle ka eona.

Mekhoa ea ho Compaction le Sintering for Complex Geometries

Ts'ebetso ea PM e fetola li-powders tsena tse tsoakiloeng ka hloko hore e be likarolo tse sebetsang ka mehato e nepahetseng. Motsoako oa phofo o theoha ka matla a khoheli ho ea ho li-dies tse khethehileng. Khatello e pakeng tsa 150 MPa le 900 MPa (e thehiloeng ho mofuta oa thepa) e petetsa phofo ho seo re se bitsang karolo e "tala".

PM e lumella bahlahisi ho theha libopeho tse rarahaneng tsa kahare le kantle ba sebelisa mekhoa e haufi-ufi ea sebopeho sa marang-rang. Li ka etsa likarolo tse qhekellang joalo ka li-helical splines-tse laolang nako ea li-valve-hantle nakong ea compaction. Sena se boloka nako ka ho khaola machining a mangata ao mekhoa e meng ea tlhahiso e tla e hloka.

Joale likarolo tsena tse tala li kena liboping tse khethehileng tse nang le moea o laoloang. Thempereichara e lumellana le lintlha tse qhibilihang tsa thepa. Sintering e kopanya likaroloana 'me e theha libaka moo ho hlokahalang. Mohato ona ke oa bohlokoa bakeng sa likarolo tsa VVT hobane e etsa qeto ea hore na likarolo li tla boloka boholo ba tsona bo nepahetseng - bo amang nako ea enjene.

Meriana ea Bokaholimo bakeng sa Ts'ebetso e Ntlafetseng

Kalafo ea holim'a metsi e etsa hore likarolo tsa VVT li sebetse hantle le ho feta. Manganese phosphating ke mohlala o motle-e etsa hore lik'hamera tsa ho kenya li fokotsehe haholo ho baka khohlano. Kalafo ena e thusa lienjineri ho boloka mafura, ke ka lebaka leo litsamaiso tsa nako tsa li-valve tse feto-fetohang li leng molemo hakana.

Liaparo tsa DLC (Diamond-Like Carbon) li ka fokotsa likhohlano ka 66% likarolong tse thellang khahlano le tse ling haholo. Baetsi ba bang ba boetse ba sebelisa mekhoa e khethehileng e kang chromizing le vanadizing ho etsa hore bokaholimo bo be thata haholo (Hv1400 ho ea ho Hv2000). Tsena li sebetsa betere ho feta liphekolo tse tloaelehileng tsa carburizing.

Lintlafatso tsena tsa bokaholimo li thusa likarolo tsa VVT hore li tšoarelle nako e telele maemong a thata a enjine. Likarolo tse nang le liphahlo tse khethehileng li bontša liphello tse tsotehang-ke li-microns tse 10 feela tsa ho apara ka mor'a 200,000 km ea tšebeliso.

Ts'ebetso eohle ea PM e theha likarolo tsa VVT tse tšoarellang, tse nepahetseng, le tse sebetsang hantle. Ena ke taba e kholo kaha e bolela hore theknoloji ea nako e feto-fetohang ea li-valve e ka etsa hore lienjineri tsa sejoale-joale li sebetse hantle.

Liteko tsa Ts'ebetso tsa 2025: PM vs. Traditional Components

Teko ea rona ea ts'ebetso ea 2025 e bonts'a lebakametsoako ea phofo ea metallurgy (PM).otla basebetsi-'moho le bona ba tloaelehileng ka mekhoa e fapaneng ea nako ea li-valve. Liteko tsa Lab le litlhahlobo tsa fatše li paka hore likarolo tsena li sebetsa betere ho feta metric e ngoe le e ngoe ea bohlokoa.

Fatigue Strength Comparison (340 MPa vs. 220 MPa)

PM le likarolo tsa setso li bonts'a phapang ea bona e kholo ka ho lekanya matla a mokhathala. Likarolo tsa "link A" tse entsoeng ke PM tse tsoang ho li-alloys tse sintered tsa Fe-Mo-C li fihlella matla a makatsang a mokhathala.340 MPaka mor'a phekolo ea mocheso. Likarolo tsa setso tsa "input cam" tse entsoeng ka thepa ea sintered Fe-Cu-C li fihla feela220 MPa. Keketseho ena ea 54% e bolela hore likarolo li tšoarella nako e telele tlas'a maemo a cyclic loading ao u ka a fumanang lits'ebetsong tsa nako ea li-valve tsa enjene.

Likarolo tsena li ka sebetsana le lipotoloho tse ling tse limilione tsa ts'ebetso pele li bonts'a ts'ebetso. Sena se etsa phapang e kholo ho boloka nako ea valve e nepahetse bophelong bohle ba enjene.

Dimensional Precision and Tolerance Analysis

Tlhahiso ea PM e fana ka mokhoa o ikhethangtumellano ya dimensional. Liteko li tiisa hore likarolo tsa PM li na le mamello ea hoo e ka bang±0.04 limilimithara. Litokiso tsena tse thata li bohlokoa lipakeng tsa likamore tsa boahelani tse hatelletsoeng ka har'a sistimi ea mofuta oa vane.

Phallo e ntle ea phofo e thusa ho tlatsa li-cavities ka potlako le ka ho lekana nakong ea tlhahiso. Sephetho? Kabo e tsitsitseng haholoanyane. Likarolo li qetella li e-na le phapang e fokolang ea boima le bolelele. U ke ke ua fumana mofuta ona oa ho nepahala ka mekhoa e tloaelehileng ea tlhahiso ha u etsa li-geometri tse rarahaneng tsa VVT.

Liphetho tsa ho tšoarella ha Mocheso o Phahameng

Likarolo tsa VVT li hloka ho sebetsana le mocheso o feteletseng, e leng se etsang hore ho hanyetsa mocheso ho be bohlokoa. Likarolo tsa PM li lula li utloahala ho tloha-40°C ho isa ho 150°C. Sena se akaretsa ntho e 'ngoe le e 'ngoe ho tloha ho serame sa arctic se qala ho fihla sehlohlolong sa mocheso.

Likarolo tsa PM li bonts'a botsitso bo makatsang ba microstructural. Ho kopanya phofo e tsoetseng pele le kabo e ntle ea koporo li thusa likarolo tsena hore li lule li tsitsitse nakong ea liphetoho tsa mocheso. Sena se bohlokoa haholo bakeng sa lits'ebetso tsa VVT hobane le litšitiso tse nyane tsa mocheso li ka ama nako le ts'ebetso ea enjine.

Apara Khanyetso Tlas'a Maemo a Feteletseng

Likarolo tsa PM li nka nako e telele ho feta likarolo tse tloaelehileng tlas'a maemo a khatello ea maikutlo. Likarolo tsa PM tse alafiloeng ka holim'a metsi li lula li tšoarella ka mokhoa o makatsang. Liaparo tse ling tse khethehileng li bontša feelaLi-micron tse 10 tsa ho apara ka mor'a 200,000 kmea tšebeliso.

Likarolo tsa PM tse nang le lisebelisoa tse khethehileng tsa machining li fokotsa sebopeho sa li-burr nakong ea ho seha ho sitisang, ho phunya masoba a tebileng, le ts'ebetso ea ho tlanya. Bokhoni bo ikhethang ba PM ba ho kopanya li-carbide tse thata ka har'a sebopeho sa thepa bo baka khanyetso ea tlhaho ea tlhaho eo tlhahiso ea setso e ke keng ea e bapisa.

Melemo ena ea ts'ebetso e hlalosa hore na hobaneng metallurgy ea phofo e etella pele ho hlahisa likarolo tsa bohlokoa tsa nako ea li-valve bakeng sa lienjine tsa sejoale-joale tse sebetsang hantle haholo.

Saense ea Lintho tse ka morao ho ts'ebetso e phahameng ea PM

Metallurgy ea phofo e theha motsoako oa lisebelisoa boemong ba athomo boo ho lahla ho ke keng ha lekana. Ho nepahala hona boemong ba limolek'hule ho hlalosa hore na ke hobane'ng ha likarolo tsa PM li sebetsa betere mekhoeng ea nako ea li-valve tse fapaneng.

Li-Alloys tsa Fe-Mo-C bakeng sa Likopo tse phahameng tsa khatello ea maikutlo

Li-alloys tsa Fe-Mo-C li bontša khanyetso e makatsang ea mokhathala ka lebaka la thepa ea tlhaho ea molybdenum. Li-alloys tsena li matla esita le mocheso o phahameng oa 1500 ° C. Li-alloys tse entsoeng ka PM li fihlella litekanyetso tsa matla a mokhathala a 340 MPa, tse otlang thepa ea setso ka bongata. Boemo bo phahameng ba ho qhibiliha (2620 ° C) ea metsoako ea molybdenum e ba thusa ho hanela ho senyeha ha mocheso, ho etsa hore e be e phethahetseng bakeng sa tikoloho e chesang ea mekhoa e fapaneng ea nako ea li-valve.

Ho eketsa lintho tse nyenyane (Ti, Zr, C) ka metsoako ea titanium-zirconium molybdenum ho ntlafatsa matla a bona le ho thatafala ha mocheso o phahameng. Baetsi ba ka lokisa metsoako ena ka ho khetha ka hloko le ho lokisa phofo. Sena se etsa hore likarolo li lule li tsitsitse ha mocheso oa enjine o fetoha.

Lisebelisoa tse Matlafalitsoeng bakeng sa Phokotso ea Khohlano

Lisebelisoa tsa PM tse ntlafalitsoeng li fetola papali ho fokotsa likhohlano. Liteko li bonts'a hore likarolo tsa lubricant tse tiileng tsa Cu @ Graphite li fokotsa khohlano lipakeng tsa libaka tse thellang ka ho feta 400%. Ntlafatso ena e kholo e etsahala hobane likaroloana tsa koporo li tlatsa mefokolo e menyenyane ha graphite e boloka lipara tse hohlang li arohane.

Li-nanoparticles tsa koporo li boetse li matlafatsa thepa ea anti-wear le likarolo tse thusang ho sebetsana le meroalo e phahameng lits'ebetsong tse fapaneng tsa nako ea camshaft. Le likaroloana tse nyane tsa li-additives tsena (ka 0.3% feela ka boima ba 'mele) li fokotsa likhohlano ka ho lula ka mokhoa o hlophisehileng libakeng tse hohlang.

Tlhahlobo ea Microstructure ea Sintered Components

Ts'ebetso ea karolo e ipapisitse le hore na o laola lintlha tse 'ne tsa bohlokoa hakae nakong ea sintering: mofuta oa phofo, boholo ba karoloana, palo ea binder, le maemo a sintering. Lintlha tsena li theha karolo ea ho qetela ea porosity, ho thatafala, le ts'ebetso ea khatello ea maikutlo.

Ho sheba sebopeho sa microstructure ho bonts'a hore na sintering e theha sebopeho se setle joang:

• Lithempereichara tse phahameng tsa sintering li etsa hore Ostwald e butsoe, moo likaroloana tse nyane li qhibilihang ebe li fetoha ho tse kholo ho abela matla ka ho lekana.
• Likarolo li hloka bonyane metsotso e 75 mochesong o phahameng haholo ho fumana sebopeho se ts'oanang se hlokahalang bakeng sa matla a matla a ho phatloha.
• Likahare tsa khabone li ama sebopeho sa mokelikeli le sebopeho sa lijo-thollo, tse lekanyetsang hore ho na le sesupo sa ho qetela le ts'ebetso

Baetsi ba PM ba ka etsa li-microstructures tse nepahetseng ka mokhoa o makatsang ka ho laola lintlha tsena ka hloko. Ho nepahala hona ho etsa hore likarolo tsena e be tsa bohlokoa mekhoeng ea sejoale-joale ea nako ea li-valve.

Mathata a Boenjiniere a Rarollotsoe ke PM Technology

Powder metallurgy (PM) e bapala karolo ea bohlokoa ho rarolle mathata a bohlokoa ao mekhoa e tloaelehileng ea tlhahiso e sa sebetsaneng hantle le boenjineri ba terene ea motlakase. Baetsi ba li-automaker ba hloka litsamaiso tse sebetsang hantle tsa nako ea li-valve, 'me theknoloji ea PM e fana ka tharollo e hlakileng mathateng a neng a ke ke a rarolloa pele.

Tlhahiso e rarahaneng ea Geometry ntle le Machining

Theknoloji ea PM e theha meralo e rarahaneng ea likarolo mohatong o le mong oa tlhahiso. Li-geometri tse rarahaneng tsa likarolo tsa VVT tsa mofuta oa vane tse nang le li-spline tsa kahare, lintlha tsa meno le likarolo tsa ho fokotsa boima ba 'mele li ba etsa bakhethoa ba phethahetseng bakeng sa tlhahiso ea PM. Senatlhahiso ya sebopeho sa letlooa kapa haufi le sebopeho sa letlowabokhoni bo fokotsa ts'ebetso ea bobeli haholo. Likarolo tsa PM tse sebetsoang ka mochini o motala li matha ka lebelo la makhetlo a robong ho feta machining a tloaelehileng a post-sintering. Katleho ena ea ho theha libopeho tse rarahaneng ntle le machining a mangata e fetola tlhahiso ea sistimi ea VVT.

Ho Fokotsa Boima Ha U ntse U Boloka Matla

Tlatsetso e kholo ea PM e ka ho fokotsa boima ba 'mele. Aluminium sprockets le rotor in automotive cam phasers boima ba ligrama tse 450, e leng ntho e kholo kaha e bolela hore ke halofo ea boima ba lik'hilograma tse 900 tsa tšepe ea sintered. Boima bo fokotsehileng bo ntlafatsa ts'ebetso ea mafura le ho fokotsa tlhahiso. Mekhoa e tsoetseng pele ea PM e kopanya likarolo tse bobebe ha e ntse e boloka botšepehi ba sebopeho-e leng bohlokoa bakeng sa lits'ebetso tsa VVT tse nang le khatello e matla.

Ntlafatso ea Friction Coefficient

Theknoloji ea PM e fana ka taolo e nepahetseng holim'a litšobotsi tsa likhohlano. Liphekolo tse khethehileng tsa holim'a metsi joalo ka manganese phosphating le li-coat tsa DLC li thusa likarolo tsa PM ho fihlela li-coefficients tse tlase tsa likhohlano. Bokhoni ba enjene boa ntlafala ha likarolo tsa PM tsa triboconditioned li fokotsa tšebeliso ea mafura ka 1%. Li kopantsoe le oli e nang le viscosity e tlase, likarolo tsena li fana ka poloko ea mafura lipakeng tsa 2-4%.

Ho Etsa Litšenyehelo ho Sekala

Tlhahiso ea PM e fana ka melemo e matla ea moruo. Ts'ebetso e sebelisa ho feta 98% ea lisebelisoa tsa ho kenya tse nang le litšila tse fokolang. Theknoloji ea PM e hloka matla a fokolang ho feta ho lahla le ho qhekella ho tloaelehileng, e leng se tlisang melemo ea tikoloho le litšenyehelo. Bokhoni ba PM ba ho hlahisa likarolo tse rarahaneng tse nang le maemo a phahameng a ho lumellana ho etsa hore e be tharollo ea moruo ka ho fetisisa bakeng sa tlhahiso ea bongata ba likarolo tsa VVT.

Qetello

Liphetho tsa liteko le tlhahlobo li bonts'a hore na ke hobane'ng ha likaroloana tsa phofo ea metallurgy e le bophelo ba litsamaiso tsa sejoale-joale tse feto-fetohang tsa nako. Likarolo tsena li sebetsa betere ho feta mekhoa e meng ea setso mme li fihlella litekanyetso tse matla tsa mokhathala oa 340 MPa - ntlafatso ea 54% ho feta mekhoa e tloaelehileng ea tlhahiso.

Liphetho li hlahisa setšoantšo se hlakileng. Likarolo tsa PM li na le nako e telele ea bophelo, li boloka mamello e nepahetseng, 'me li sebetsa hantle mochesong o feteletseng ho tloha -40°C ho ea ho 150°C. Phokotso ea boima ba 'mele ka 50% ha e ntse e boloka botsitso ba sebopeho e etsa hore e be tsa bohlokoa ho baetsi ba likoloi ba shebaneng le ts'ebetso ea mafura le phokotso ea mesi.

Melemo ea tlhahiso le eona ea hlahella. Mekhoa ea PM e sebelisa 98% ea lisebelisoa tsa ho kenya letsoho 'me e baka litšila tse fokolang ho feta tlhahiso ea setso. Litšobotsi tse phahameng tsa ts'ebetso le boemo bona ba ts'ebetso bo etsa hore metallurgy ea phofo e be mohloli o hlakileng oa tlhahiso ea karolo ea VVT.

Liphetho tsa rona tsa liteko tsa 2025 li bontša seoLikarolo tsa PM e tla lula e le bophelo ba litsamaiso tse tsoetseng pele tsa nako ea enjene. Li fana ka ho nepahala, ho tšoarella le ho sebetsa hantle hoo boenjiniere ba sejoale-joale ba hlokang.

FAQs

Q1. Melemo ea mantlha ea likarolo tsa phofo ea metallurgy (PM) lits'ebetsong tse fapaneng tsa nako ea li-valve ke life? 

Likarolo tsa PM li fana ka matla a phahameng a mokhathala (340 MPa vs 220 MPa bakeng sa likarolo tsa setso), ho nepahala ho ntlafetseng, ho ntlafala ha ho apara, le ts'ebetso e ntlafetseng ho pholletsa le mocheso o feteletseng (-40 ° C ho 150 ° C). Li boetse li lumella li-geometri tse rarahaneng le ho fokotsa boima ba 'mele ha u ntse u boloka matla.

Q2. Theknoloji ea nako e feto-fetohang ea nako (VVT) e ntlafatsa ts'ebetso ea enjine joang? 

Sistimi ea VVT e ntlafatsa ts'ebetso ea li-valve maemong a fapaneng a enjine, e bakang ts'ebetso e ntlafetseng ea mafura (ho fihla ho phokotso ea 15% nakong ea ho idling), ts'ebetso e ntlafetseng, le ho fokotsa likhase. Li lumella lienjineri ho ikamahanya le lebelo le meroalo e fapaneng ka mokhoa o atlehileng ho feta lits'ebetso tse tsitsitseng tsa nako.

Q3. Ke mefuta efe e fapaneng ea litsamaiso tsa nako ea li-valve tse sebelisoang lienjineng tsa sejoale-joale? 

Ho na le mefuta e meraro e meholo ea litsamaiso tsa VVT: litsamaiso tsa cam phasing tse fetolang nako ea li-valve, litsamaiso tsa taolo ea li-valve tse fetolang phahamiso ea li-valve, le litsamaiso tse sa fetoheng tse ka fetolang mekhahlelo e mengata ho kenyelletsa nako, nako le ho phahamisa.

Q4. Mokhoa oa ho etsa likarolo tsa PM o fapana joang le mekhoa ea setso? 

Ho etsa PM ho kenyelletsa khetho e hlokolosi ea phofo, compaction e nepahetseng, le sintering e laoloang ho theha likarolo tse rarahaneng tse nang le machining a fokolang. Ts'ebetso ena e lumella tlhahiso ea sebopeho se haufi-ufi, e fokotsa litšila, 'me e nolofalletsa ho theha likarolo tse nang le thepa e khethehileng e etselitsoeng likopo tsa VVT.

Q5. Litšenyehelo tsa ho sebelisa likarolo tsa PM lits'ebetsong tse fapaneng tsa nako ke life? 

Le hoja litšenyehelo tsa pele li ka 'na tsa e-ba holimo, likarolo tsa PM li fana ka melemo ea nako e telele ea litšenyehelo ka lebaka la ho tšoarella ha tsona, ho fokotsa tlhokahalo ea ho nkeloa sebaka, le ho ntlafatsa ts'ebetso ea mafura. Ts'ebetso ea tlhahiso e boetse e na le chelete e ngata ho feta tekanyo, e sebelisa ho feta 98% ea lisebelisoa tsa ho kenya 'me e hloka matla a fokolang ha a bapisoa le mekhoa ea khale ea ho lahla le ho etsa.