Gearyana nufin gear a gefen ci gaba da watsa meshing na motsi da ikon kayan aikin injiniya, ta hanyar haƙorin gear, tsagi hakori, fuskar ƙarewa, fuskar al'ada, da'irar saman haƙori, da'irar haƙori, da'irar tushe, da'irar rarraba da sauran su. sassa, an yi amfani da shi sosai a cikin watsawar injiniya da kuma dukkanin filin injiniya.
Matsayin gear shine yafi watsa wutar lantarki, yana iya canja wurin jujjuyawar shaft zuwa wani shaft, hadewar gear daban-daban na iya taka rawar daban, na iya gane ragewar injin, girma, canza shugabanci da jujjuya aikin, ainihin na'urorin injin suna wanda ba a iya raba shi da kayan aiki.
Akwai nau'ikan kayan aiki da yawa.Dangane da rarrabuwa na zanen kaya, ana iya raba shi zuwa nau'ikan uku: Shafface Shaft, wanda ke kewaye da kayan tauraro.Daga cikin su, a layi daya shaft kaya kuma ya hada da spur kaya, helical kaya, ciki kaya, tara da helical tara, da dai sauransu Intersecting shaft gears da madaidaiciya bevel gears, Arc bevel Gears, sifili bevel Gears, da dai sauransu The staggered shaft kaya ya staggered shaft helical. kaya, kayan tsutsa, kayan aikin hypoid da sauransu.