Ingalo ye-rocker emotweni empeleni iyisivikelo esinezingalo ezimbili esiphinda sisebenzise amandla avela endukwini yokusunduza bese sisebenza ekugcineni kwenduku ye-valve ukuze sivule i-valve. Isilinganiso sobude bezingalo ezinhlangothini zombili zengalo ye-rocker sibizwa ngokuthi isilinganiso sengalo ye-rocker, esingaba ngu-1.2 ~ 1.8. Ukuphela kwengalo ende kusetshenziselwa ukusunduza i-valve. Ubuso obusebenzayo bekhanda lengalo ye-rocker ngokuvamile benziwe ngesimo se-cylindrical. Lapho ingalo ye-rocker ijika, ingagingqika ebusweni bokugcina benduku ye-valve, ukuze amandla aphakathi kwalawa amabili asebenze nge-axis ye-valve ngangokunokwenzeka. Ingalo ye-rocker nayo ibholwa ngamafutha okugcoba kanye nezimbobo zamafutha. Isikulufu sokulungisa sokulungisa i-valve clearance sifakwa emgodini onentambo ekugcineni kwengalo emfushane yengalo ye-rocker. Ibhola lekhanda lesikulufu lithintana ne-concave tee phezulu kwenduku yokusunduza.
Ingalo ye-rocker ayinalutho ebekwe ku-shaft yengalo ye-rocker ngokusebenzisa i-rocker arm bushing, kanti eyesibili isekelwe esihlalweni se-shaft yengalo ye-rocker, kanti ingalo ye-rocker ibhobozwe ngemigodi yamafutha.
Ingalo ye-rocker ishintsha indlela amandla avela entongeni yokusunduza bese ivula ivalvu.
