Design And Optimization Of Double-Axes Turning Machenism On Heavy Vehicles

With the development of China's transportation, the applications of heavy vehicles become more and more common, Heavy vehicle steering system increasingly become the focus of the study. Heavy vehicle steering mechanism generally consists of trapezoid turning mechanism, and vertical arm mechanism. By the trapezoid turning mechanism to achieve with angle match of wheels on one axis, the vertical arm mechanism achieve with angle match of wheels on one side. Two parts work together, to meet the request of all wheel's axes line across one point while turning. For the dead point of trapezoid turning mechanism in big corner turning, a new steering mechanism has been proposed: centre arm of six member mechanisms, to meet the request of big corner in heavy vehicle's turning. Based on the improvement of the vertical arm mechanism theory, design a set of matching vertical four member mechanism. Compared with the traditional type, the new one simplified the type of vertical transmission mechanism. In this paper, analytical method used in design, combining optimization theory, identified 10 parameter optimization objective functions, application MATLAB optimization toolbox function to program, gain the optimization results. Finally, the more rigid system theory application in the double axes steering system kinematics simulation has also been discussed, and use of more rigid based simulation software ADAMS to establish the spatial model for kinematics analysis and simulation test. Use the design and optimization analysis to analyses impact of the kinematics parameters to the system performance then protract error curves.The main conclusions: 1. Structure size of centre arm have a decisive impact on inter or outer corner range. To achieve big corner range request, the Centre arm triangle should become a lanky type, the contrary, they are also. 2. When determine the inter angle, the realization of smaller outer corner requested the centre arm triangle should become a lanky type. Instead, they are also.3. The size of four vertical member mechanism should be selected according to the actual situation, through changing the length of the two member join with bottom of heavy vehicles.