Chochepetsera magiya a nyongolotsi ndi njira yotumizira mphamvu yomwe imagwiritsa ntchito chosinthira liwiro cha giya kuti ichepetse kuchuluka kwa ma revolutions a injini (motor) kufika pa chiwerengero chofunikira cha ma revolutions ndikupeza njira yayikulu yotumizira mphamvu. Mu njira yomwe imagwiritsidwa ntchito kutumiza mphamvu ndi kuyenda, kuchuluka kwa ma reductioner ndi kwakukulu kwambiri. Zotsatira zake zitha kuwoneka mu makina osiyanasiyana, kuyambira zombo, magalimoto, sitima zapamadzi, makina olemera omangira, makina opangira zinthu ndi zida zopangira zokha zomwe zimagwiritsidwa ntchito mumakampani opanga makina, mpaka zida wamba zapakhomo m'moyo watsiku ndi tsiku. , mawotchi, ndi zina zotero. Kugwiritsa ntchito kwa chochepetsera mphamvu kumatha kuwoneka kuyambira pa kutumiza mphamvu yayikulu kupita ku kutumiza katundu waung'ono ndi ngodya yolondola. Mu ntchito zamafakitale, chochepetsera mphamvu chimakhala ndi ntchito zochepetsera mphamvu ndi kukweza mphamvu. Chifukwa chake, chimagwiritsidwa ntchito kwambiri pazida zosinthira liwiro ndi ma torque.
Pofuna kupititsa patsogolo ntchito ya chochepetsera zida za nyongolotsi, zitsulo zopanda chitsulo nthawi zambiri zimagwiritsidwa ntchito ngati zida za nyongolotsi ndipo chitsulo cholimba ngati shaft ya nyongolotsi. Chifukwa ndi choyendetsa chotsetsereka cha friction, panthawi yogwira ntchito, chimapanga kutentha kwakukulu, zomwe zimapangitsa kuti zigawo za chochepetsera ndi chisindikizo zigwirizane. Pali kusiyana kwa kutentha pakati pawo, zomwe zimapangitsa kuti pakhale mpata pakati pa malo aliwonse olumikizirana, ndipo mafuta amakhala ochepa chifukwa cha kutentha komwe kumawonjezeka, zomwe zimakhala zosavuta kuyambitsa kutuluka. Pali zifukwa zinayi zazikulu, chimodzi ndi chakuti ngati kufananiza kwa zinthu ndikoyenera, china ndi mtundu wa pamwamba pa malo olumikizirana, chachitatu ndi kusankha mafuta opaka, ngati kuchuluka kwa kuwonjezera kuli kolondola, ndipo chachinayi ndi mtundu wa kusonkhana ndi malo ogwiritsira ntchito.
