A new kind of gear is presented in recent years which is called double involute gear with ladder shape of tooth.In this papaer

a new type of geometrical model for the tooth profile of this new kind of gear is constructed.Based on the model

a new hobbing method

named orthogonal two way link shifting method

is proposed.It has cutting characteristics with economic

simple and easy.It uses an common hob to cut gear

so we need not spend lots of money and sprits to design and manufacture the special hob for the gears.The production cost and period will be decreased greatly and this makes it possible to diversify the design and manufacture of this new kind of gear and to be used in a wide range.