I-Piston Ring (Piston Ring) isetyenziselwa ukushumeka i-piston groove ngaphakathi kwentsimbi yentsimbi, iringi yepiston yahlulwe ibe ziindidi ezimbini: iringi yokucinezela kunye neringi yeoli. Iringi yoxinzelelo ingasetyenziselwa ukutywina igesi yomxube ovuthayo kwigumbi lokutsha; Iringi yeoli isetyenziselwa ukukhuhla ioyile engaphezulu kwicylinder.
Umsesane wepiston luhlobo lweringi yentsimbi eneelastiki ene-deformation enkulu yangaphandle, ehlanganiswe kwiprofayili kunye ne-groove ehambelana nayo. Amakhonkco episton abuyelayo kunye ajikelezayo axhomekeke kumahluko woxinzelelo lwerhasi okanye ulwelo ukwenza itywina phakathi kwesangqa sangaphandle sesangqa kunye nesilinda kunye necala elinye lomsesane kunye negroove yeringi.