Ipiston isebenza phantsi kobushushu obuphezulu, uxinzelelo oluphezulu, isantya esiphezulu kunye nokuthambisa kakubi. I-piston idibana ngokuthe ngqo negesi ephezulu yobushushu, kwaye ubushushu bexeshana bunokufikelela ngaphezu kwe-2500K, ngoko ke, ubushushu bunzulu, kwaye iimeko zokutshatyalaliswa kobushushu zibi kakhulu, ngoko ke ubushushu bepiston buphezulu kakhulu xa usebenza. umphezulu uphezulu njenge 600 ~ 700K, kwaye unikezelo lobushushu alulingani kakhulu; Umphezulu wepiston unoxinzelelo oluninzi lwegesi, ngakumbi olona xinzelelo luphezulu lomsebenzi, injini yepetroli ukuya kuthi ga kwi-3 ~ 5MPa, i-injini yedizili ukuya kuthi ga kwi-6 ~ 9MPa, eyenza impembelelo yepiston, kwaye imelane nendima yoxinzelelo olusecaleni; I-piston kwi-cylinder ngesantya esiphezulu (8 ~ 12m //s) intshukumo ehambelanayo, kwaye isantya sihlala siguquka, esivelisa amandla amakhulu angenayo, ukwenzela ukuba i-piston ifakwe kumthwalo omkhulu owongezelelweyo. Ukusebenza phantsi kweemeko ezinzima ngolo hlobo, i-piston iya kukhubaza kwaye ikhawulezise ukunxiba, kwaye iya kuvelisa imithwalo eyongezelelweyo kunye noxinzelelo lwe-thermal, ngelixa ifakwe iikhemikhali yigesi.
Ukuhlolwa kwepiston ubukhulu becala kumlinganiselo wedayamitha yesiketi, ubude be-piston ring groove kunye nobungakanani bomngxuma wesitulo sepiston:
① Ukukhethwa kwepiston kufuneka kumiselwe ngokobungakanani bokulungiswa kwe-cylinder. Ngokuqhelekileyo ubukhulu obukhulu buphawulwe kumphezulu wepiston;
② Kuluhlu olufanayo lweentlanzi, ukwakhiwa kwepiston akufani ngokufanayo, ngoko xa ukhetha ipiston, uhlobo oluhambelanayo lwepiston kufuneka lukhethwe ngokohlobo lwenjini. Kwi-injini enye, i-piston ye-brand efanayo, iqela elifanayo okanye ikhowudi yemveliso efanayo kufuneka ikhethwe; I-piston yomzekelo ofanayo kufuneka isetyenziswe kunye nekhowudi yemveliso efanayo ukuze kuqinisekiswe ukuba umehluko phakathi kobubanzi kunye nomgangatho wepiston awugqithisi umda ochazwe yifektri yokuqala. Ngaphandle koko, kuya kubangela ukutshiswa kwe-injini embi, umsebenzi onzima, ukuhla kwezoqoqosho kunye namandla kunye nokunye ukusilela. Ngoko ke, xa ukhetha ipiston, uhlobo oluhambelanayo lwepiston kufuneka lukhethwe ngokohlobo lwe-injini.