The authors proposed a high-efficiency CNC generating method for cylindrical gear with arcuate tooth traces,by means of a standard hob and studied the hobbing mechanism.

Arcuate Tooth Trace Cylindrical Gear is a new type of gear,and has the merits of higher bending strength,lower noise, better lubrication effect, more adaptable about parallelism error of axis, no axial thrustforce, etc.

The paper put forward the geometrical parameters of involute arc cylindrical gear,the flank expression and the conjugate flank expression were derived with differential geometry and the line of mesh and the line of contact were calculated.