| At present,environmental pollution,energy shortage and climate change have become common problems faced by countries all over the world.Automobile electrification is an effective way to solve the current problems.China accounts for 8% of the heavy-duty trucks,accounting for 57% of the NOx emission of the whole automobile industry.Under the global burden of energy conservation and emission reduction,the carbon emission and pollutant emission of medium and heavy-duty trucks have undoubtedly become a problem that must be solved.Traditional trucks have the following three disadvantages: first,the efficiency of engine combustion is low;Secondly,there is a loss of mechanical efficiency in the transmission system;Third,the energy loss caused by braking cannot be recovered.At present,the prototype of hybrid truck on the market is mainly driven by centralized motor,but this is only to replace the engine with motor on the basis of traditional fuel vehicles.The power is still transmitted from the motor to the wheels through clutch,transmission,transmission shaft,main reducer,etc.in this process,the mechanical loss caused by the above transmission mechanism has not been eliminated,Therefore,the advantages of motor drive are not brought into full play.In view of the above problems,this paper designs a new type of axle end hub motor with outer rotor and inner stator based on Solid Works.Its main breakthrough is to design a axle end hub motor that can drive heavy trucks and form a hybrid power system.In this paper,the integrated design of the hub motor and the shaft end structure at both ends of the drive axle can not only avoid more changes to the existing truck chassis structure,but also make full use of the space of the outer tire hub,but also provide a feasible scheme for the hybrid and electrification of fuel vehicles in the existing stock market.The main work of this paper is as follows:Firstly,on the basis of the designed three-dimensional structure,the stress analysis and modal analysis of the structural components mainly bearing the rotating frequency load,such as the axle,half shaft,hub and stator connectors and planet carrier connectors,are carried out based on ANSYS workbnech.By solving the first six mode response modes of each structure,Analyze whether the minimum natural frequency of each structure is less than the working frequency of truck hub motor to ensure that there is no resonance risk during operation.Secondly,based on the theory of dynamics and kinematics,using ADAMS and other simulation software,this paper evaluates the feasibility of the design structure of hub motor by analyzing the parameters such as force,speed,acceleration,torque and hinge force of the internal gear of hub motor,as well as the power output under full load condition.Thirdly,the virtual road surface is designed to apply the excitation signal,which is imported into Adams view as the road excitation,and the ride comfort of the whole vehicle is evaluated by evaluating the ride comfort of a single hub motor.Finally,through Hyper Mesh and other software,simp variable density method is used to optimize the topology of the connector part and hub part of the axle motor structure,so as to obtain the best material distribution and topological morphology of the structure of each connector under the actual working condition.The result cloud diagram is analyzed to determine the force transmission path and optimization direction of the hub structure under the actual working condition,In order to grasp the follow-up development and design of wheel hub products.At the same time,on the premise of ensuring the performance indexes such as strength and stiffness,the quality is reduced by about 20%,and the normal fuel consumption is reduced to a certain extent,which has achieved the purpose of lightweight,weight and cost reduction. |
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