Research On Structure Of Fastening Parts Of Seat Belt In The Truck

As a measure of the passive safety of automobile,many countries have established corresponding laws to enforce the safety belt in the car.When the vehicle collision accident or roll happened,safety belt assembly could restraint the car occupant firmly in the seat to prevent the occupant flying out of the car or crashing with the car components,thus to eliminate the second collision and to reduce occupant damage degree.The safety belt fixing parts must meet the strength requirements,otherwise,even the seat belt itself strong enough,it could not guarantee the safety of the passengers.In Europe and the United States laws and regulations,safety belt fixed component test is a compulsory examination project vehicle notice test.With the increasing progress of our car enterprises independent research and development ability and the needs of the user,a safety belt fixed component strength test has been defined as mandatory requirements.At the same time,the government has issued a series of favorable policies,to encourage the independent brand car enterprises to increase investment in research and development,research on the key technology of automobile reliability and durability,safety,energy conservation and other vehicles,to further promote the safety strength in the field of development.The automobile enterprises of our country own brand to the safety belt reliability,the fixed point intensity to increase the research strength,from the safety belt structure,the body strength and material and so on many aspects to enhance the safety belt system's reliability.On the basis of a domestic independent brand car enterprises R & D projects,in contrast to seriously study the domestic and foreign automobile safety belt mounting parts on the basis of laws and regulations,loading conditions of safety belt fixing components in automotive collision simulation analysis is carried out by car design modeling software and finite element analysis software,which is optimized for the local structure in the body of light weight,high strength principle,effectively improve the strength of the safety belt fixed component.Main work includes:The establishment of geometric model consistent with the real vehicle under the Catia environment,including the rear seat and safety belt system of BIW structure,including framework,based on the improvement of solder joints and cab rear glue.After the analysis of the safety belt model of rear seat and the body,the data were introduced into Hypermesh software to establish the simulation model.The white body and seat belt were defined in the model according to the standard grid and to the actual parts materials.Finite element model will be submitted to the LS-DYNA solver to calculate the explicit algorithm for the rear belt fixed point strain,around the solder joint stress situation analysis,analysis results show that there are two fixed point does not meet the strength requirements.Based on the structure of body in white light on the principle of safety belt fixed point optimization,material replacement in higher yield strength and properly increasing the reinforcing plate thickness,re submit the calculation shows that the improved safety belt fixed component strength to meet the requirements of relevant laws and regulations.According to the test methods and regulations,organize a cab and the seat belts,and other parts to the testing center for vehicle detection,the test results and the CAE analysis results,the two conclusions are consistent.In this paper,through the CAE simulation analysis for automobile designers to provide a safety belt with a fixed part of the design reference,effectively improve the design success rate,to a certain extent,reduce the development cycle of automotive products and development investment.