Camshaft ndi gawo la injini ya pistoni. Ntchito yake ndikuwongolera kutsegula ndi kutseka kwa valavu. Ngakhale camshaft imazungulira pa theka la liwiro la crankshaft mu injini ya ma stroke anayi (camshaft imazungulira pa liwiro lomwelo ndi crankshaft mu injini ya ma stroke awiri), camshaft nthawi zambiri imazungulira pa liwiro lalikulu ndipo imafuna torque yambiri. Chifukwa chake, kapangidwe ka camshaft kamafunikira mphamvu zambiri komanso zofunikira zothandizira. Nthawi zambiri imapangidwa ndi alloy kapena chitsulo cha alloy chapamwamba. Kapangidwe ka camshaft kamakhala ndi gawo lofunikira kwambiri pakupanga injini chifukwa lamulo la kayendedwe ka ma valavu limagwirizana ndi mphamvu ndi magwiridwe antchito a injini.
Camshaft imakhudzidwa ndi zinthu zomwe zimagundana nthawi ndi nthawi. Kupsinjika pakati pa CAM ndi turtet ndi kwakukulu kwambiri, ndipo liwiro lotsetsereka nalonso ndi lalikulu kwambiri, kotero kutopa kwa malo ogwirira ntchito a CAM ndi kwakukulu. Poganizira izi, camshaft journal ndi malo ogwirira ntchito a CAM ayenera kukhala olondola kwambiri, okhwima pang'ono komanso olimba mokwanira, komanso ayenera kukhala ndi kukana kwambiri kutopa komanso mafuta abwino.
Ma camshaft nthawi zambiri amapangidwa ndi chitsulo cha kaboni kapena alloy chapamwamba kwambiri, koma amathanso kupangidwa ndi alloy kapena nodular cast iron. Malo ogwirira ntchito a journal ndi CAM amapukutidwa pambuyo potenthedwa.
