A new method for the design of line-contact gear profiles is introduced in this paper. In this method, the deviation function technique will be applied to generate the new gear profiles. Non-Uniform Rational B-Splines will be implemented as the deviation functions. Theory and algorithm of this method is implemented into an automatic software design package. Written in C language, this package is graphically interactive and PC based. According to design objective, many new conjugate profiles for gears or rotors can be obtained. Compared to current line-contact gears of involute profiles, some of these new profiles could achieve greater average profile conformity, which results in decreased contact stresses, and could also achieve decreased bending stresses. Since these gears are capable of carrying higher loads than gears of equivalent sizes, there should be cost savings and reduced machine sizes in certain special applications.
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