Nws yog ib qho kev taw qhia kev tsheb nqaj hlau thiab crankshaft, uas yog me ntsis poob siab los ntawm lub log eccentric, nyob rau hauv uas lub cev muaj zog crankshaft txav thiab cov phaj pub yog me ntsis vibrated kom cov khoom ua ntej sai, yog li ntawd cov khoom tsis yooj yim deformed thiab tawg.