Ingalo yerocker emotweni ngokwenene yi-lever enemikhono emibini ephinda isebenzise amandla avela kwi-push rod kwaye isebenze esiphelweni se-valve rod ukuze ivule i-valve. Umlinganiselo wobude beengalo kumacala omabini engalo yerocker ubizwa ngokuba yi-rocker arm ratio, emalunga ne-1.2 ~ 1.8. Elinye icala lengalo ende lisetyenziselwa ukutyhala i-valve. Umphezulu osebenzayo wentloko yengalo yerocker ngokubanzi wenziwe ngesimo se-cylindrical. Xa i-rocker arm ijika, inokuqengqeleka ecaleni kobuso be-valve rod, ukuze amandla phakathi kwezi zimbini asebenze kwi-axis ye-valve kangangoko kunokwenzeka. Ingalo yerocker ikwagqojozwa ngeoyile yokuthambisa kunye nemingxunya yeoyile. I-screw yokulungisa yokulungisa i-valve clearance ifakwa kumngxunya onemisonto kwisiphelo sengalo emfutshane yengalo yerocker. Ibhola yentloko ye-screw idibana ne-concave tee ephezulu kwi-push rod.
Ingalo ye-rocker ayinanto ibekwe kwi-rocker arm shaft ngokusebenzisa i-rocker arm bushing, kwaye le yokugqibela ixhaswe kwisihlalo se-rocker arm shaft, kwaye ingalo ye-rocker igqojozwe ngemingxuma yeoyile.
Ingalo yerocker itshintsha indlela amandla avela kwi-push rod ize ivule ivalvu.
