The traditional tractor rear axle adopts planetary gear mechanism to change the transmission ratio, which not only achieves compact structure and small use area, but also achieves multiple transmission schemes and multiple transmission ratios. However, our traditional transmission arrangement often achieves multiple transmission ratios by arranging gear pairs of different sizes on the shaft, which not only occupies a large volume, but also is prone to collision and wear in gear meshing. The idea of planetary gear mechanism is introduced into the gearbox to create a new type of gearbox mechanism. In this scheme, face gear mechanism, planetary gear mechanism, brake and one-way clutch are mainly used.
Face gear is a kind of face gear transmission device used for two-phase cross axis or two-phase cross axis with 90 ° angle or non 90 ° angle. It is mainly used for face gear transmission of standard straight teeth or spiral teeth under heavy load and long-term use.
The relevant research and practice abroad have shown that face gear has a good application in low speed, high speed, light load and heavy load situations, and can replace straight bevel gear, solitary bevel gear and hypoid gear in design.
The schematic diagram of common face gear transmission is shown in the figure.
Face gear transmission is actually the meshing transmission of cylindrical gear and bevel gear. When the included angle between the axis of the involute straight cylindrical gear and the axis of the bevel gear is 90 °, the teeth of the bevel gear will be distributed on a circular plane, and the bevel gear is a plane gear, which is generally referred to as the face gear transmission.