Ndi njanji yopanda chiwongolero komanso kayendedwe ka crankshaft, komwe kumadodometsa pang'ono ndi gudumu la eccentric, momwe crankshaft yamoto imasuntha ndipo mbale ya chakudya imagwedezeka pang'ono kuti zinthu zipite patsogolo mwachangu, kuti zinthuzo zisapunduke komanso kusweka. .