Study And Structural Design On Active Wheel

An active wheel system which has many advantages was designed based on body andwheel of an electric all terrain vehicle (ATV). The system used of two lower-power DC motorto replace traditional single high-power motor as a power source of vehicles, And theplanetary transmission mechanism was built into the wheel hub. It greatly simplified thestructure of transmission. This system not only meets the highest requirement of speed andacceleration but also better solve the problem of excess energy of a single motor in differentdriving conditions. This system can also recover braking energy. Study and design of theactive wheel system have been conducted as follows:Firstly, the general scheme of the active wheel system has been designed by contrastingand analyzing the strengths and weaknesses of existing types of active-wheel drive systemsused in vehicle. Appropriate type of motor has been selected and the structure of thetransmission has been designed according to the basic parameters and technical requirementsof the test car.Secondly, according to analyzing the contact stress variation under the differentcoefficient of friction in different gear meshing position, it has been proved that thecorrectness of the theory that gear meshing into the point was the worst position of contact.Based on this theory, Finite element contact analysis of different number of planetary gearstransmission schemes has been conducted. The law of contact stress variation with differentnumber of planetary gears has been obtained. Comprehensive consideration of all factors,three planetary gear transmission scheme has been adopted.Finally, finite element analysis of the key parts has been conducted according to themaximum dynamic loads. The stress and deformation status of the key parts have beenobtained. It has been ensure that strength and stiffness of the key parts met the designrequirements. To ensure the fatigue strength requirements under cyclic loading, the fatigueanalysis of the fastening flange and main-shaft have been conducted by using ofANSYS/FE-SAFE. Low-carbon steel of the flange material was replaced into quality lightAluminum alloy under the fatigue strength met the requirements.