S birki camshaftgalibi ya ƙunshi CAM da sandar shaft, CAM yana da alaƙa da sandar shaft, wanda ke da alaƙa da CAM mai ma'ana da sandar shaft, sashin tsayin daka na CAM yana tsakiyar S-dimbin siffa, kuma S-dimbin nau'ikan arcs biyu na waje suna tsakiyar CAM concentric da'irar involute.CAM yana samuwa a ƙarshen sandar shaft.Saboda haka, yana da dacewa mai kyau tare da tsarin birki na mota, kuma ikon watsawa ya fi dacewa a cikin tsarin watsawa, da kuma rikici. coefficient yana da ƙananan, don haka don rage lalacewa a cikin tsarin amfani, tsawaita rayuwar sabis da rage farashin kulawa. , tasiri mai amfani ya fi kyau.