Computer-aided Parameterized Design of Spur Gear

Spur gear wheel especially involute gear is an agriculture machinery part in common use,while because of its complex tooth profile,it is difficult to conduct parameterized design.A parameterized design method based on 3D software-UG NX was introduced to conduct 3D modeling for spur gear.Through operating commands,gear slot contour was set up,tooth profile body was formed and finally 3D modeling of spur gear was established.Meanwhile,the differences between the two gear modeling methods which have tooth boundary of 41 were analyzed.Through this modeling method,the corresponding spur gear can be obtained immediately after giving the parameters such as gear's tooth number,modulus and pressure angle without programming works.