Jefa Knuckle, wanda aka sani da "RAMBY ', yana daya daga cikin mahimman sassan gada na mota, wanda zai iya sa motar tafiyar motoci mai mahimmanci. Aikin matsar da maƙarƙashiya shine canja wurin da ɗaukar nauyin motar, goyan baya da tuƙi ƙafafun gaba don jujjuya wa KingPhin ya juya motar. A cikin tuki yanayin motar, yana ɗaukar nauyin tasiri, sabili da haka, ana buƙatar samun babban ƙarfi, da kuma mashin za su haɗa, kuma ta hanyar flange na rami dutsen da tsarin birki. Lokacin da abin hawa ke tafiya a babban gudun, rawar jiki watsa ta hanya zuwa farfajiya zuwa matattarar sauya a cikin tayoyin shine babban abin da za'a la'akari da shi a cikin binciken mu. A cikin lissafi, ana amfani da ƙirar abin hawa don amfani da hanzari 4g zuwa abin hawa, da kuma ƙarfin ayyukan ƙwallon ƙafa guda biyu a ƙarshen fuskar saiti a ƙarshen flange an tilasta shi.
