Ingalo yerocker emotweni eneneni sisileva esixhobe-mbini esibuyisela amandla ukusuka kwintonga yokutyhala kwaye sisebenze ekupheleni kwentonga yevalve ukutyhala ivalve ivuleke.Umlinganiselo wobude bengalo kumacala omabini engalo yerocker ubizwa ngokuba yi-rocker arm ratio, emalunga ne-1.2~1.8.Esinye isiphelo sengalo ende sisetyenziselwa ukutyhala ivalve.Umphezulu osebenzayo wentloko yengalo ye-rocker ngokuqhelekileyo yenziwe nge-cylindrical shape.Xa ingalo yerocker ijinga, inokuqengqeleka ecaleni kobuso bentonga yevalve, ukuze amandla phakathi kwezi zimbini asebenze ecaleni kwe-axis yevalvu kangangoko kunokwenzeka.Ingalo yerocker iphinda yombiwe ngeoyile yokuthambisa kunye nemingxuma yeoli.Isikrufu sokulungelelanisa ukucocwa kwevalve sifakwa kumngxuma ophothiweyo kwincam yengalo emfutshane yengalo yerocker.Ibhola yentloko ye-screw idibene ne-concave tee phezulu kwintonga yokutyhala.
Ingalo yerocker ayinanto iseti kwi-rocker arm shaft kwi-rocker arm bushing, kwaye le yokugqibela ixhaswa kwisihlalo se-rocker arm shaft, kwaye ingalo ye-rocker yombiwa ngemingxunya yeoli.
Ingalo yerocker itshintsha icala lamandla ukusuka kwintonga yokutyhala kwaye ivule ivalve.
