Gears tau siv rau hauv kev sib kis tau ntev. Thaum ntxov li 300 BC, tus kws tshawb fawb Greek thaum ub Aristotle, hauv nws * Mechanical Problems*, tau tham txog kev siv tooj liab lossis cam khwb cia hlau iav los xa cov lus sib hloov. Cov Suav yav qab teb thaum ub - taw qhia tsheb thauj neeg twb tau siv lub tshuab ua tiav. Txawm li cas los xij, cov iav qub tau ua los ntawm cov ntoo lossis cov hlau nrum, thiab tsuas yog xa cov lus sib hloov ntawm cov ncej, tsis tuaj yeem lav kev sib kis tau zoo. Lawv cov load-cov kabmob muaj peev xwm kuj tsawg heev.
Cov iav yas yog siv rau kev sib kis. Ua los ntawm yas, lawv yog meshing toothed mechanical qhov chaw, thiab lawv daim ntawv thov nyob rau hauv mechanical kis tau tus mob thiab tag nrho cov neeg kho tshuab teb yog heev nthuav.
Niaj hnub nimno iav tshuab tau ua tiav: iav modules ntawm 0.004 ~ 100 hli; iav diameters ntawm 1 mm ~ 150 mm; fais fab kis mus txog 100,000 kW; ceev mus txog 10,000 rpm; thiab qhov siab tshaj plaws circumferential ceev ntawm 300 m / s.
