Farantin kariya na injin ƙasa, wanda aka fi sani da farantin kariya na injin, galibi na'urar kariya ce ta injin da aka ƙera a kusa da ramin asali na girder a kusa da samfurin da injin. Tsarin ƙirarsa shine don hana lalacewar injin da tasirin dutsen da ke fitowa daga saman hanya ya haifar, sannan kuma don hana mamaye ƙasa da najasa zuwa cikin ɗakin injin yayin aikin tuƙi, wanda ke haifar da gazawar injin. Ta hanyar ƙirar 3D ta asali mai girma uku, don samar da kariya mafi girma ga injin, don guje wa tsarin tafiya, saboda abubuwan waje da lalacewar injin ke haifarwa, wanda ke haifar da lalacewar mota, ɓoye matsala, tsawaita rayuwar injin, tuƙi ba tare da damuwa ba!
Farantin kariya na ƙasan injin na'urar kariya ce ta injin da aka tsara bisa ga nau'ikan ababen hawa daban-daban. Tsarin farko shine don hana ƙasa rufe injin, wanda ke haifar da ƙarancin zubar zafi na injin. Na biyu, shine don hana injin lalacewa saboda tasirin rashin daidaiton saman hanya akan injin yayin tuki. A guji lalata mota da lalacewar injin saboda abubuwan waje yayin tafiya.
