The Key Technologies Of Developing Automobile Power Train'impacting Durability Test Rig

At present, a great deal of experiment data is needed in developing advanced automobile chassis power train. In experiments about fatigue life of automobile power train only the steady torsion load in the general working condition is considered, but the operating condition of power train is very complicated. For example, when the high speed motor starts suddenly or instantly brakes without loosing clutch, the impact torque will be produced in this power train. Representing the durability of power train under big torsion impact load on the test rig makes important sense for providing experiment data for new product developing and improving product developing level. Referring to mechanism, power transmission, system controlling, computer programming and communicating, impacting durability test-rig of automobile power train is a kind of complicated experiment equipment. Interiorly, the developing of this kind of test-rig is still blank. Owing to lacking of theory research on factors of big torsion impact load which influences the power train, quantitative analysis of these factors is made in this paper by building mathematical model of two different working conditions. The first problem that needs resolved during the development of this test-rig is the loading magnitude and sequence, that is to say, the problem of loading chart. Working out the loading chart of this test-rig is a key technique during the equipment developing. The loading chart reflects the actual loading condition of automobile power train, which needs the character of representing, validity and reliability. During the development of this test-rig, the method of working out programming loading chart under different working conditions is put forward in this paper. In this method, according to the sample acquired by measuring the course of torque and time on typical road surfaces and different working conditions, the continual course of load and time will be dispersed by double parameter rain-drop counting method statistical analysis. The statistical counting result is that the relation of torque swing, average and appearance frequency is planar random variables. According to the actual sample measured of automobiles, the distributing parameters of the power train during the whole life cycle are determined. At last the maximum of the load swings of the full life cycle under different working conditions are received after dealing with the result of rain-drop and the programming load charts of the test-rig are worked out by ratio. All kinds of factors influencing the impact load of the automobile power train must be fulfilled by the mechanical system under the control of the test-rig, which will reappearance the peak value torque and load sequences which were determined during the loading chart of the test-rig. The mechanical system is the base of the test-rig and the action of the test-rig is finally added to the power train of the tested automobile. The development and design of the mechanical system meet the need of the experiments of all trucks also ensure the experiment precision and make the test-rig function reposefully and reliably. The mechanical system is the base of the test-rig and the action of the test-rig is finally added to the power train of the tested automobile. The development and design of the mechanical system meet the need of the experiments of all trucks also ensure the experiment precision and make the test-rig function reposefully and reliably. Influence the power train of the automobile to assault various kinds of loaded factors, under testing the function controlled in platform, finished finally by the mechanical system, in order to reappear load of torsion and load of peak value in the test rig. In this paper, the dynamical and mechanical systems are basic parts of test-rig, and considering meet with requirements of the transmission in light, medium and heavy truck. And the rotating inertia of the flywheel group is designed and can be chosen according to the style of the truck. For installing and debugging, we design one installation for inertia systems, as for connect axle and transaxle parts, we designed adjusting system for operation. At for mechanical system, we fully consider the load characteristic of impacting test. The key parts, such as resist ability to strike in inertia axle and connect axle etc. were made and checking conscientiously, Meanwhile, Rotating parts with high speed is confirmed for dynamic equilibrium test requirements to ensure safety for operation to the mechanical system.