Crankshaft nigice cyingenzi cya moteri. Ibikoresho byayo bikozwe mubyuma bya karubone cyangwa ibyuma bya nodular. Ifite ibice bibiri byingenzi: ikinyamakuru nyamukuru, ikinyamakuru gihuza ikinyamakuru (nibindi). Ikinyamakuru nyamukuru gishyizwe kumurongo wa silinderi, ijosi rihuza ijosi rihujwe nu mwobo munini wumutwe winkoni ihuza, naho umwobo muto uhuza inkoni uhujwe na piston ya silinderi, nuburyo busanzwe bwo kunyerera.

Igikoresho nyamukuru cya crankshaft bakunze kwita ikintu kinini. Kimwe n'inkoni ihuza inkoni, nayo ni kunyerera igabanijwemo ibice bibiri, aribyo nyamukuru (hejuru no hepfo). Igiti cyo hejuru cyo hejuru gishyizwe mumyobo nyamukuru yimyanya yumubiri; icyuma cyo hasi cyashyizwe mubifuniko byingenzi. Igice kinini cyo gutwara hamwe nigifuniko nyamukuru cyumubiri gihujwe hamwe ningenzi nyamukuru. Ibikoresho, imiterere, kwishyiriraho hamwe nu mwanya wibikoresho nyamukuru birasa cyane nkibyahuza inkoni ihuza. Kugirango ushikirize amavuta inkoni ihuza imitwe minini, umwobo wamavuta hamwe nu mavuta ya peteroli mubisanzwe bifungura kumurongo wingenzi, kandi umutwaro wo hasi wibikoresho nyamukuru ntabwo ufunguye hamwe nu mwobo wamavuta hamwe na peteroli kubera umutwaro mwinshi. . Mugihe ushyiraho ibyingenzi byingenzi bya crankshaft, witondere umwanya nicyerekezo cyicyerekezo.