Sisikhokelo esingesosisikhokelo kunye nentshukumo yecrankshaft, eyothuswa kancinane livili le-eccentric, apho i-motor crankshaft ihamba kunye nepleyiti yokutya ishukunyiswa kancinane ukwenza imathiriyeli iqhubele phambili ngokukhawuleza, ukuze imathiriyeli ingakhubazeki ngokulula kwaye yophukile.