The cosine gear drive is a new type of gear drive

which takes a cosine curve as the tooth profile.The solid model of the cosine gear is established by using Pro/E software.The former 6 order of natural frequencies and principal shapes are calculated by using programme ANSYS.The influences of design parameters including the modulus

the number of teeth

the tooth width and the aperture

on natural frequency and modal shape are also discussed.The results indicate that the modal shapes are circumferential

torsional

umbellate and folio vibration.The natural frequency at every rank increases with the increase of the tooth width and the aperture

and decreases with the increase of the number of teeth and the modulus.The results reveal the dynamic performance of the cosine gear.