| In recent years, the rapid development of the national economy to promote the rapid development of the automobile industry, In the case of vehicle speed, traffic density,driver’s nonprofessional we have higher requirements for the operational stability of the vehicle. Automotive power steering gear is an important part of the automobile steering system, which is a special mechanism to change or keep the vehicle running direction. The steering system performance directly affects the vehicle handling stability and safety.So steering before leaving the factory need to ensure the quality is qualified,mainly to detect the inner leaking and steering force characteristics.Firstly, the performance test of the power steering gear needs to be filled with oil. After testing the performance enterprises need to recycle oil. The purpose is to save production costs and avoid waste.At the same time, it will not cause pollution to the production environment when the vehicle is equipped. Due to the complex internal flow channel of the steering gear,the Method of relying on gravity and blowing gas cannot clean the internal oil, and achieve the best effect of oil discharge. Therefore, the work of this paper is to design a set of qualified oil drainage equipment. The main work of this paper is reflected in the following aspects:First of all, the domestic and foreign research data about the steering gear are collected to understand the internal structure, working principle of power steering gear and the research status of the oil discharging device. We must be familiar with the direction of the oil circuit. These will lay the theoretical and technical foundation for the later model modeling, simulation analysis and the design of the oil discharging device.Then the shape and size of the internal flow channel of the 3411010- A50 A automotive power steering gear are established by using CATIA. The simulation results of gas-liquid two-phase flow field of automotive power steering gear are obtained by using the workbench using workbench to carry on the grid division, the simulation analysis of model. According to the flow channel pressure distribution chart, the velocity distribution chart, the oil volume distribution chart and so on to analysis the situation of the oil flow.The simulation results provide theoretical basis for the following experiments.Finally, based on the inner fluid distribution after filling in high pressure gas to design the experiment of oil discharge and put forward the corresponding improvement plan. In this paper, we design a PLC program to control the whole experimental process. We analyze the experimental data using the variance analysis method to determine the optimal parameters of oil discharge, that is the optimal level intake time, discharge time and total time. Through the experiment to improve the experimental parameters, constantly adjustthe PLC program according to the experimental results to improve the experimental program. Finally, an optimal experimental scheme is obtained. |
