Usheeda dhexe waa shafka gudbiya torque u dhexeeya gearbox yareeya iyo giraangiraha wadista (inta badan adag ee la soo dhaafay, laakiin usheeda dhexe ee godan way fududahay in la xakameeyo dheelitir la'aanta wareegga. Sidaa darteed, baabuur badan ayaa isticmaala ulaha godan). Dhammaadka gudaha iyo dibaddaba waxay leeyihiin isku-dhafan caalami ah (U / wadajir) siday u kala horreeyaan, kaas oo ku xidhan qalabka wax-yareeya iyo giraanta gudaha ee xuddunta iyada oo loo marayo kabuunka isku-dhafka caalamiga ah.
Usheeda dhexe waxaa loo isticmaalaa in lagu wareejiyo awoodda u dhexeeya kala duwanaansho iyo giraangiraha drive. Diidka bar ee dabada wadista caadiga ah ee aan jabin waxa loo qaybin karaa sabbayn buuxda, 3/4 sabayn iyo badh sabbayn iyadoo loo eegayo foomamka taageerada ee dhamaadka sare.