双横臂悬架在转向和跳动时运动分析.docVIP

双横臂悬架在转向和跳动时运动分析 　　Abstract:The solid model of a vehicular double wishbone type front suspension was established. After achieving the data of key points, the kinematics simulation analysis of simplified model was carried out. The change of the alignment parameters under the condition of steering and bouncing was analyzed. The results met the requirement of front suspension. 　　Keywords：Double wishbone type suspension; Solid model; Kinematics analysis 　　 　　 　　I.INTRODUCTION 　　Front suspension system is an important part of the car system, which have a critical impact on automotive handling stability and ride quality. By studying the wheel alignment of double wishbone front suspension when certain vehicle steering and bouncing, you can accurately grasp the suspension characteristics and provide a reference basis for improved design 　　II. SOLID MODEL 　　Take the double-wishbone type front suspension of certain pickup as an example. Build the three-dimensional models of various parts. Then assemble them to get the solid model of the double-wishbone front suspension. Due to bilateral symmetry，we just take half of it into research，as shown in Figure 1. 　　Figure 1 1/2 Solid Model of double wishbone type front suspension 　　III. KINEMATIC MODEL OF DOUBLE-WISHBONE FRONT SUSPENSION 　　Regard the kingpin, the steering knuckle and the wheel as a whole. The single-sided double-wishbone suspension actually consists of the upper arm, the lower arm, the steering knuckle (kingpin) and the frame. It is a spatial four-bar linkage of two-degree-of-freedom. The length of the upper and lower arm is unequal. And the hinges joined the arms and the frame are not on the same plane.All of these lead to the results of the kingpin inclination and the caster angle. Its kinematic diagram is shown in Figure 2. 　　Figure 2 1/2 Kinematic Model of double wishbone type front suspension 　　A: Oscillation Centre of Upper Arm 　　B: Oscillation Centre of Lower Arm 　　C:Intersection Point of Kingpi