Structural Design And Optimum Analysis Of Trunk Lid Hinge Device For A Passenger Car

With the increasing popularity of passenger cars,people have higher and higher requirements for their comfort and stability.The trunk lid system is an independent assembly used to pick up and put things in passenger cars.It mainly consists of two parts: the trunk lid hinge device and the trunk lid.Among them,the trunk lid hinge device has three forms: torsion bar hinge device,air spring hinge device and electric hinge device.At present,the most commonly used economical passenger car in the market mostly adopts the torsion bar hinge device which is composed of gooseneck tube hinge and torsion bar spring.It has the advantages of simple structure,light weight,easy manufacture and low cost.In the process of designing the hinge device of the torsion bar type trunk lid,many technical requirements such as balance angle,closing force,vertical stiffness and service life need to be met.However,due to insufficient understanding of the performance and working principle of the device by domestic manufacturers,there will be some problems such as insufficient stiffness and low service life in the process of using the device.Aiming at the problems existing in the design of torsion bar type trunk lid hinge device,this paper aims at optimizing the structure of torsion bar type trunk lid hinge device.The structure of torsion bar type trunk lid is analyzed and studied by means of theoretical analysis,modeling simulation and experimental verification.The main contents of this paper are as follows:(1)Dynamics analysis of trunk cover hinge device.The stress state of the hinge device under the opening state of the trunk lid is analyzed and verified by the dynamic simulation technology.The balance angle of the hinged device of the trunk lid is calculated and analyzed,and the structural parameters of the hinged device are determined.(2)Analysis of stiffness and fatigue life of trunk cover hinge device.The vertical stiffness and fatigue life of trunk lid hinge device are analyzed by finite element method,and verified by relevant experiments.It is found that the finite element simulation results are in good agreement with the experimental results,and the results show that the vertical stiffness and fatigue life of the hinges are relatively low.(3)Optimum design of hinge device for luggage case cover.By establishing a mathematical model,the factors affecting the vertical stiffness and fatigue life of the hinge device of the torsion bar type trunk lid are explored,and the optimized results are verified by finite element simulation.Verification shows that the vertical stiffness and fatigue performance of the optimized trunk cover hinge device are greatly improved.This paper designs and optimizes the structure of the torsion bar type trunk lid hinge device,explores the design factors affecting the vertical stiffness and fatigue life of the torsion bar type trunk lid hinge device,and greatly improves the vertical stiffness and fatigue performance of the optimized trunk lid hinge device.The research results can provide reference value for the development of the trunk lid hinge device.