Samfurin mai amfani yana ba da makircin fasaha mai zuwa: madaidaicin madaidaicin mai ba da man fetur ya haɗa da akwati, crankshaft yana jujjuyawa a cikin akwati, an haɗa ƙarshen crankshaft tare da motar, an gyara ƙarshen ƙarshen crankshaft tare da fan, an haɗa shinge mai hawa a saman akwati, an gyara silinda a kan shingen hawa, an shirya piston don iska mai matsawa a cikin silinda, kuma ana tuƙa piston kuma ana haɗa shi da crankshaft, The crankcase is cylindrical , fan yana cikin akwati kuma yana daidaitawa tare da crankcase, ana ba da toshe mai hawa tare da ramin jagorar iska don sanyaya bangon silinda, ramin jagorar iska yana haɗi da ramin ciki na crankcase da saman farfajiyar shinge, ana ba da bangon gefen silinda tare da matattara mai zafi, an samar da tashar watsa zafi tsakanin bututun zafi da bangon waje na silinda, da ramin jagorar iska. yana fuskantar tashar watsewar zafi.

Mafi fifikon ƙirar mai amfani: silinda madauwari ne, shinge mai hawa yana da kusurwa huɗu, an ba da tsakiyar shingen tare da ramin haɗin silinda, ramin jagorar iska yana a ɓangarorin biyu na ramin haɗin, da jagorar iska an bayar da rami tare da masu tsauri.

Samfurin amfani zai fi dacewa yana da fa'idodi masu zuwa: kaurin bango a ɓangarorin biyu na ramin jagorar iska daidai yake.

Mafi fifikon ƙirar mai amfani shine crankcase da silinda an yi su da aluminium.

Idan aka kwatanta da fasahar da ta gabata, tasirin fa'idar ƙirar mai amfani shine crankcase shine cylindrical, fan yana cikin akwati da coaxial tare da akwati, kuma an gyara fan a ƙarshen ƙarshen crankshaft. Lokacin da crankshaft ke jujjuyawa, piston tuƙin yana motsawa sama da ƙasa a cikin silinda don damfara iska. A lokaci guda, fankar da aka gyara akan crankshaft shima yana juyawa tare don samar da kwararar iska, Gudun iska yana sanyaya bangon silinda ta cikin ramin jagorar iska. Akwatin katako shine cylindrical. Idan aka kwatanta da crankcase na rectangular, trapezoidal da sauran sifofi, juriya ta haifar da kwararar iska tayi karami. Fan ɗin yana cikin akwati da coaxial tare da akwati. Nisa daga gefen gefen fan ɗin zuwa bangon ciki na crankcase yana da daidaituwa kuma yana da sauƙin sarrafawa a cikin ƙaramin fanni, wanda zai iya haɓaka ƙimar kwararar iska, bangon waje na silinda ya yi sanyi mafi kyau, kuma ramin jagorar iska yana da alaƙa kai tsaye zuwa watsawar silinda

Gudun iskar da fan ke haifarwa za a iya amfani da ita sosai don sanyaya bangon silinda.