In order to solve the limitation of center distance adjustment and strength distribution of conventional gear

a structure with the same base pitch but different modulus was proposed to greatly improve the strength of small gears in gear transmission

especially the strength of the tooth root. But used in the engineering practice in modulus differ with tooth profile angle are smaller

the formation principle of involute gear tooth surface and the gear meshing analysis of some parameters

got this kind of gear modulus

tooth number

tooth shape parameters such as coefficient of angle

depth of constraints

and through the formula deduction coefficient of the teeth

the tooth depth and the relation between the dividing circle pressure angle limit value. Based on the modeling of engineering practice and the finite element analysis through Ansys

the gear strength designed based on the limit parameters is about 2.66 times of the standard gear

which verifies the feasibility of the theory and expands the application range of this gear pair.