Kab ntsig C7 / C9 Ua tiav Shim Assortment - Lifting-Curve Linearization Rau ACERT Injectors

Caterpillar C7 thiab C9 ACERT cov cav, nruab nrog HEUI (Hydraulic actuated Electronic Unit Injector) cov tshuab, yog qhov tshwj xeeb hauv thaj chaw tsheb ciav hlau - qhov kev txhaj tshuaj siab yog tsim hydraulically los ntawm cov roj cav es tsis yog lub twj tso kua mis sib cais. Qhov kev hloov kho shim, nyob nruab nrab ntawm lub piston intensifier thiab lub plunger, txiav txim siab qhov compression stroke ntev ntawm lub plunger, ncaj qha tswj lub siab amplification piv. Kev hloov pauv ntawm 0.015 hli hauv shim thickness hloov qhov kev siv zog los ntawm ze li ntawm 4 bar ntawm crankshaft degree, uas txhais tau hais tias qhov ntsuas tau hloov pauv hauv qhov ntsuas hluav taws xob qeeb thiab lub suab nrov combustion. Qhov noKab ntsig C7 / C9 Shim Assortmentkho txhua tus shim tsis yog ib tug passive spacer, tab sis raws li ib tugmechanical hloov kev ua haujlwm, tso cai rau cov kws tshaj lij los ua kom lub tshuab nqus cov lus teb hydraulic thoob plaws rau lub tog raj kheej, them nyiaj rau kev hnav hauv ob qho tib si roj actuation Circuit Court thiab roj pressurization chamber.

 

Caterpillar pom zoo tshuaj xyuas lub shim ntawm txhua qhov kev txhaj tshuaj overhaul (feem ntau yog 5,000-teev ib ntus). Peb cov khoom muaj xws li ahnav-limit gauge thaiv-ntiv nplhaib ntawm 1.800 mm, 2.000 mm, thiab 2.200 mm- uas tso cai rau tus kws kho mob sai sai xyuas seb lub shim siv tau hnav hauv qab nws qhov tsawg kawg nkaus ua haujlwm thickness. Yog hais tias lub shim dhau los ntawm qhov ntsuas qhov sib thooj uas tsis muaj qhov tsis kam, nws yuav tsum muab pov tseg. Qhov kev sib piv ntawm lub cev no txo ​​qis kev cia siab ntawm micrometers hauv thaj chaw, ua raws li Caterpillar's "kev pabcuam hauv thaj chaw" lub tswv yim.

Cov shims no yog tsim los ntawmNitrided 42CrMo4 cov cuab yeej steel, hardened mus rau ib tug tseem ceeb ntawm 38-42 HRC nrog ib tug deg hardness ntawm 58-60 HRC, ib tug ua ke uas resists ob yas deformation thiab nto qaug zog nyob rau hauv lub intensifier piston lub cyclic load (txog 120 MPa nyob rau hauv lub roj chamber). Lub ntsej muag sab saum toj thiab hauv qab yog hauv av mus rau qhov chaw roughness Ra 0.15 µm thiab lub tiaj tiaj ntawm 0.002 mm hla tag nrho txoj kab uas hla, kom ntseeg tau tias cov khoom thauj los ntawm lub piston kis tau zoo thoob plaws lub ntsej muag shim. Ib qho 0.15 × 45℃ntug tawg tiv thaiv kev ntxhov siab ntawm qhov ib puag ncig, uas yog qhov tseem ceeb vim tias lub shim tau khaws cia rau hauv lub bore nrog tsawg kawg nkaus radial clearance; ib qho burr yuav cuam tshuam qhov ntxig thiab tuaj yeem dhau los ua qhov tsis ua tiav qhov pib.

Nyob rau hauv HEUI systems, lub cav roj kub (90-110 degree) thiab roj kub (60-80 degree) tsim ib tug complex thermal gradient thoob plaws lub cev injector. Cov hlau shim nthuav dav ntawm kwv yees li 11.5 µm / m·K, thaum cov lus qhia bronze nyob ib puag ncig nthuav dav ntawm 18.0 µm / m·K- qhov sib txawv uas ua tau zoo txo ​​cov shim thickness los ntawm 0.008-0.012 hli thaum lub cav nce mus txog qhov kub thiab txias piv rau lub rhiav txias. Cov assortmentthermal kho daim npavteev cov kev tshem tawm kub zoo rau txhua qhov nominal thickness ntawm peb qhov kev siv roj kub, tso cai rau tus kws tshaj lij xaiv qhov txias shim uas ua rau qhov xav tau kub lub xeev intensifier stroke. Qhov kev them nyiaj ua ntej ua ntej tshem tawm qhov xav tau rau kev hloov kho tom qab sib sau ua ke kub, txuag qhov nruab nrab ntawm 45 feeb rau ib qho kev txhaj tshuaj.

Cov txheej txheem shim no tau lees paub zoo rau Caterpillar HEUI injectors siv hauv cov cav hauv qab no thiab tshuab platforms:

C7 (thiab C7.1)- siv nyob rau hauv 312D, 320D, thiab 325D excavators, thiab 988G log loaders - injector feem naj npawb 191-2357, 259-4384, 306-7500

C9 (thiab C9.3)- siv nyob rau hauv 336D, 345D excavators thiab 972H loaders - injector feem naj npawb 191-2358, 259-4385, 306-7501

C9.3 (Ter 4 Kawg)- nrog cov tshiab pin-type plunger phau ntawv qhia - yuav tsum tau shims nrog lub qhov loj me me; Cov txheej txheem suav nrog ob lub sub-series kom meej meej sau npe (Hom A thiab Hom B)

Cov shims muaj qhov sib txawv sab nraud ntawm 19.50 mm, tab sis Hom B suav nrog 7.0 mm sab hauv qhov tshem tawm piv rau Hom A 6.0 mm. Lub thawv assortment tau muab faib ua ob qhov sib xyaw nrog cov ntsuas pom, kom tsis txhob muaj qhov yuam kev ntawm kev xaiv.

Q1: Kuv yuav ua li cas thiaj txiav txim siab qhov tseeb shim thickness rau C7 injector yam tsis tau tshem tawm cov tshuaj txhaj tshuaj los ntawm lub cav?
Koj yuav tsum tshem lub injector los ntsuas lub plunger protrusion kom raug. Txawm li cas los xij, cov khoom siv suav nrog qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas qhov siab ntawm lub plunger txheeb ze rau lub ntsej muag lub cev lub ntsej muag - cov ntaub ntawv no, ua ke nrog peb daim ntawv xaiv thickness, yields qhov tseeb shim thickness yam tsis tau disassembled lub pressurization chamber.

Q2: Kuv puas tuaj yeem sib xyaw shims los ntawm cov txheej txheem no nrog cov kab ntsig qub ntawm tib lub nominal thickness?
Yog lawm, ntev npaum li lub thickness kam rau ua (ISO 2768-f, ± 0.002 mm) thiab cov khoom hardness match. Txawm li cas los xij, peb pom zoo kom siv cov txheej txheem ua tiav rau ib qho kev txhaj tshuaj kom tsis txhob muaj kev sib koom ua ke; kev sib xyaw ua ke los ntawm cov tuam txhab sib txawv tuaj yeem qhia txog 0.006 hli sib txawv hauv ib pawg.

Q3: Yuav ua li cas yog tias kuv nruab ib lub shim uas yog 0.02 hli tuab dua li tus nqi suav?
Lub intensifier piston yuav taug kev me ntsis, txo lub siab amplification los ntawm kwv yees li 3-4 bar ntawm ncov load. Qhov no tuaj yeem ua rau txo qis me ntsis hauv cov zis hluav taws xob thiab ua rau kom muaj pa taws ntau ntxiv. Lub cav yuav zoo li tsis qhia qhov txhaum cai, tab sis kev lag luam roj tuaj yeem ua rau qis dua 1.0-1.5% dhau sijhawm.

Q4: Puas yog cov shims no tau sib xws nrog cov remanufactured C9.3 injectors uas siv ceramic plunger?
Ceramic plungers xav tau tib yam shim geometry, tab sis qhov kev sib kis ntawm cov khoom sib txawv -ceramic yog stiffer, yog li cov shim xaiv yuav tsum suav rau txo compression ntawm lub plunger nws tus kheej. Cov khoom siv phau ntawv muaj xws li daim ntawv qhia ntxiv tshwj xeeb rau cov khoom siv ceramic plunger, kho lub hom phiaj thickness downward los ntawm 0.010 mm los them.

Q5: Dab tsi yog qhov shim thickness cuam tshuam rau lub injector lub acoustic kos npe (combustion suab)?
Ib qho thinner shim nce qhov kev siv zog, ua rau lub siab nce siab thiab ua kom muaj zog dua, ntau dua hlau combustion khob. Conversely, ib tug thicker shim softens tus nqi nce, txo cov suab nrov tab sis muaj peev xwm txia ib ntus teb. Lub assortment tso cai rau kev kho kom zoo kom sib npaug ntawm lub suab nrov thiab kev ua haujlwm, ib qho uas siv los ntawm lub cav tuners thiab cov neeg ua haujlwm hauv hiav txwv.

Q6: Kuv puas tuaj yeem siv cov txheej txheem no los rov kho cov tshuaj txhaj tshuaj ntawm cov tshuab tsis-Caterpillar HEUI, zoo li Navistar lossis International tsheb thauj khoom?
HEUI injectors siv nyob rau hauv Navistar VT365 thiab MaxxForce xyaw qhia tib yam qauv tsim tab sis siv ib qho txawv shim txheej kab (17.5 hli) thiab thickness ntau (1.300–1.700 hli). Cov txheej no tsis ncaj qha sib xws; Thov xa mus rau peb cov Navistar shim siab assortment.

 

Txhawm rau ua kom koj qhov kev yuav khoom tau yooj yim thiab yooj yim, peb muab ntau yam kev xaiv them nyiaj ruaj ntseg:

Peb nyob ntawm no los ua kom koj cov txheej txheem xaj kev txhawj xeeb-dawb - xaiv txoj kev them nyiaj uas ua haujlwm zoo tshaj rau koj!

 

 

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