Crankshaft ndi chigawo chachikulu cha injini, ndipo ntchito yake ikugwirizana mwachindunji ndi khalidwe ndi moyo wa injini. Ubwino wa crankshaft umatsimikizira mwachindunji momwe magwiridwe antchito ndi chitetezo cha injini ya dizilo ikuyendera. Ngati crankshaft ipitilira kugwiritsidwa ntchito pambuyo popindika ndikupindika, imathandizira kuvala kwa makina olumikizira ndodo, komanso kuyambitsa ming'alu ndi kuthyoka kwa crankshaft. Injini isanasonkhanitsidwe, zimapezeka kuti kupindika kwa crankshaft kwadutsa muyeso waukadaulo, kotero kuti tchire la coaxial siliyenera kusonkhanitsidwa monyinyirika. Ngati crankshaft yokhala ndi kupindika kopitilira muyeso imayikidwa ndi tchire zazikulu, crankshaft imakhala yolimba komanso yotayirira panthawi yogwira ntchito. Crankshaft imapanganso kukakamiza kwina pa chitsamba chonyamula, ndipo chifukwa chake, chitsamba chonyamula chimatha mwachangu, zomwe zingayambitse ngozi yoyaka chitsamba. Nkhaniyi ikuwunikira zomwe zimayambitsa kupindika ndi kupindika kwa crankshaft.

Zifukwa za crankshaft kupindika ndi kupindika:
(1) Pamene crankshaft ikupera ndi kukonza, malo otsekera si abwino, ndipo kulondola kwa chopukusira sikuli kwakukulu.
(2) Injini imadzaza, mosalekeza "deflagration", ndipo ntchitoyo siikhazikika, kotero kuti mphamvu ya magazini iliyonse imakhala yosagwirizana.
(3) Kusiyana pakati pa crankshaft yonyamula ndi ndodo yolumikizira ndi yayikulu kwambiri, ndipo kulimba kwake ndi kosiyana, zomwe zimapangitsa kuti likulu la magazini lisagwirizane ndipo limakhudzidwa panthawi yogwira ntchito.
(4) Pamene ng'anjo ya injini yatenthedwa ndi kukumbatiridwa ndi crankshaft, crankshaft imapindika ndi kupindika.
(5) The crankshaft axial movement ndi yaikulu kwambiri, kapena kulemera kwa pisitoni ndi gulu la ndodo yolumikizira ndi yosiyana, ndipo kusiyana kwake ndi kwakukulu kwambiri.
(6) Nthawi yoyatsa ndi yoyambilira kwambiri, kapena nthawi zambiri pamakhala ma plug 1 kapena 2 omwe amagwira ntchito molakwika, zomwe zimapangitsa kuti injini isayende bwino ndipo crankshaft ilandila mphamvu zosagwirizana.
(7) Mulingo wa crankshaft wathyoka, kapena kuchuluka kwa ndodo yolumikizira gulu la crankshaft ndi flywheel kwasweka; crankshaft imakhala yovala kwambiri, yopanda mphamvu komanso yolimba, kapena kupindika ndi kugwedezeka chifukwa cha kusokonekera kosayenera.
(8) Zida za crankshaft sizili bwino, kapena crankshaft ndi yopunduka chifukwa choyika mopanda nzeru kwa nthawi yayitali.
(9) Galimoto ikayamba kuyendetsa, kumasula chopondapo cha clutch kumathamanga kwambiri, ndipo chinkhoswe sichofewa. Kapena yambitsani injiniyo ndi mphamvu yamphamvu, zomwe zimapangitsa kuti crankshaft igwedezeke mwadzidzidzi.
(10) Gwiritsani ntchito mabuleki mwadzidzidzi pamene mukuyendetsa galimoto, kapena gwiritsani ntchito zida zapamwamba ndi liwiro lotsika kuti muyendetse monyinyirika pamene mphamvu ya injini ili yosakwanira.