gear

Iigiya zixhaphake kakhulu kuthungelwano ngoomatshini, njengeebhokisi zegiya, apho iigiya zinenatha nezinye iigiya ezihambelanayo ukutshintsha isantya, itorque, kunye nendlela. Iigiya zisetyenziselwa ukusasaza (intshukumo yesetyhula) okanye intshukumo yomgca. Sibonelela ikakhulu ngezixhobo zelanga ezichanekileyo, iigiya zeplanethi (i-Epicyclic gearing), kunye nezixhobo ezisetyenziselwa ukwahluka kweemoto, njl.