A Medium-sized Truck Powertrain Mounting System Optimization

Five levy group independent research and production of medium-sized truck FD1071P8K, matching is levy a new generation of Altria 2000 body, engine for the Chinese famous brands of FAW Xichai 4102 diesel engine, the gearbox for the FAW teeth. 6T46, overall a reasonable match, strong power, users of vehicle response is satisfied, the whole market is very hot. But also has some flaws, is in the diesel engine idling, Powertrain vibration through the suspension system are transferred to the frame, and then through the cab suspension system is transmitted to the driving cab interior, causing the operator feel very uncomfortable, when a vehicle runs normally at a given speed, might also have similar phenomenon. For this kind of phenomenon, the user is not satisfied with, seriously affecting the vehicle sales, to sales work brought very bad impact.Problems occurring after, company takes seriously very much, immediately organized technical personnel to conduct market research, comparative study of the industry 's products, to the maturation medium truck enterprise learning, for example: FAW, Dongfeng, area, market data, starting from their own, searching for roots, specially set up public relations team to solve this problem. I have the honor to participate in the planning and carried out a thorough, comprehensive research, summarize the experience of predecessors, collection of domestic and foreign advanced design concepts, especially truck powertrain mounting system of knowledge, use the knowledge, for the company's models were verified, control, learning its advantages, improve our defect. In the company of many models, select the user responded very strongly FD1071P8K model as an example, the models for Volkswagen models, has the certain representation, solve the model problem, other related models can consult this model to undertake corresponding adjustment.According to this model, the first and the engine manufacturer, has made the engine itself relevant data, levy used engine basically is 4 cylinder, in-line 4 stroke diesel engine, and most of the domestic diesel engine manufacturers have business dealings, the manufacturers of the products in Roswell models have matching. The engine data, in response to engine vibration, analysis of single cylinder, 4 cylinder diesel engine exciting force and exciting force distance, so as to find idle vibration, suspension system needs to meet the conditions, and deduces the engine exciting force and exciting force from the power assembly suspension system and vehicle effect of. The predecessor to the powertrain mounting system has been researched very perfect, this paper on the basis of summarizing their experience, using the previous related theory, to establish a medium truck FD1071P8K powertrain mounting system of a mechanical model. Use of levy the existing equipment condition, and the engine, gearbox manufacturers supporting communication, accurate measurement of the engine, gear box. The power assembly quality, using the company's production workshop of existing tooling and existing mathematical model, get the powertrain of the moment of inertia and the product of inertia, for the next step of the calculation, optimization of foundation.Based on data obtained after the study of levy, vehicle characteristics, without changing the position of suspension system under the premise, the suspension system the direction pad stiffness are optimized, according to the measured data obtained after the optimization of stiffness. Stiffness was determined before and after optimization, notify the suspension cushion supporting manufacturers, according to the optimization of stiffness, produced 2 sets of samples, to levy company, are respectively arranged in the same 2 trolley, ready for test. Test equipment used was the Jiangsu Donghua test of limited company of technology of DH5922 dynamic signal test and analysis system, and test department together with my colleagues on the models were tested, the obtained results were compared, the optimized isolation rate was obviously improved, the optimization result is distinct.Through this topic research, summed up the medium truck powertrain layout, determines the power assembly mounting system and mounting cushion stiffness relationship, you can not change the power assembly mounting system position under the premise, through the optimization of the suspension stiffness, to optimize the vehicle idle vibration, formed a set of guidelines for medium truck Powertrain Mount system design method and the standard.