Sub-actuator’s function(commonly known as the second gearbox )is distributing transmission’s energy to the drive axl. Actuator is also a gear drive system, which is separately located on the vehicle chassis, the transmission input shaft and output shaft gears connected with universal joints, sub-actuator have several output shafts, they are connected with driving bridge by the universal joints respectively. When the cross country vehicle running on the good way ,it always cut down the power to front axle in order to reduce consumption of transmitting mechanism and wheel. According to the need ,the cars connect the front axis and use low speed when in the off-road driving to increase the number of driven wheels and drive power.
This article describes the three axle off road vehicle actuator design calculation process, the design part describe the sub-actuator’s design process. The design is mainly divided into design and technology parts, select configuration, main parameters, gear design, shaft design, calculation check, and design of other structural components. Crafts part mainly diagnose typical component’s technology process, determine the materials of all kinds of components.