Parameterized design of cylindrical involute helical gear using UG

Cylindrical involute helical gear is a part in mechanical drives in common use,while because of its complex tooth profile,it is difficult to conduct parameterized design.3D software-UG NX3 was introduced to conduct 3D modeling for cylindrical involute helical gear.First,through operating commands in model module such as regulation curve,ruled,sew,trim body,extract geometry,etc,gear slot contour was set up,and its body was formed using Bool operation.Then 3D modeling of cylindrical involute helical gear was established making use of feature array.Meanwhile,the differences between the two gear modeling methods which have tooth boundary of 41 was discussed.Through this modeling method,the corresponding cylindrical involute helical gear can be obtained immediately after giving the parameters such as gear tooth number,normal module and helical angle.This method provides a reference for parameterized design of other bodies having complex surface profile.