The Influence of Module, Facewidth and Helix Angle on the Load Capacity of External Spur Gears

Gears are an important component in the structure of mechanical power transmission machines. It consists of two gears, which by means of the gear teeth transmit torsional motion and torque between the shafts on which the gears are mounted. Generally speaking, gears are the link between the driving machine and the working machine. The main advantages of gears are constant transmission ratio, operational safety, high efficiency, small size, etc. The main disadvantages are high cost due to high precision of execution and assembly. An important aspect is gear damage due to the complex stresses to which the teeth are subjected during operation. This paper presents a study of the design factors of gears in terms of tooth contact resistance and tooth bending strength, with a view to reducing the amount of material required for gear construction.