| Automotive seat motor is an essential part of the automotive seat. It attracts more and more attention in the modern antomotive industry. Motors that control the position and angle of front-back adjustment, up-down adjustment, backrest adjustment and headrest adjustment are configured in the electrical seat of the high-end automobiles.The backrest adjustment motor in this thesis is one of them which adjust the backrest’s position and angle. The motor’s positive-negative rotations decide the backrest’s positive-inversion circumgyrations, thus, fulfill the drivers’and passengers’ requriments. For single motor, the backrest adjustment motor (e.g.) consists of current imput assembly, armature-magnet assembly, gear transmission mechanism and torque output assembly-electric unit part and mechanical control part. The electric unit part is used for charging and controlling, and the mechanical control part-worm wheel transmission mechanism is the key one which completes the adjustment of the seat. At the same time, this part is also the one which has the most difficult design method and the biggest amount of problems. According to the feedback of the applications in the automobiles, the reliability of the electric unit part is really high, so the invalidity usually appears in the transmission mechanism. The continuity, stability and intensity whether meets the requriments affect the performance of the motor directly.Due to the particularity of the transmission mechanism, this thesis took the test results of the physical prototypes as the foundation and replaced the physical prototype with the virtual prototype. And this thesis took the application of the mechanism as the utmost target. After simulation analysis and finite element analysis, this thesis not only confirmed that VPT could be credible and feasible in the design of these kinds of motors, but also explained that simulation analysis and finite element analysis could be integrated effectively for the initial design. Thus, we could grasp the problems in time and start to think how to solve them. This too, could conduct the design pattern of automotive window motors, sunroof motors and other seat adjustment motors.Traditional design technique of the motor is acquiring data from the test results of the physical prototypes. This process may be complicated and of high cost. Virtual prototype technology can solve the problem efficiently.This thesis set forth the developing and researching situation of the automotive seat motor, and presented a new design pattern based on the latest bachrest adjustment motor form Bosch Automotive Products (Changsha) Co. Ltd.. The thesis incurred the virtual prototype technology and combined with the finite element analysis, it presented a design pattern for this kind of motor. The thesis also explained the significance of this design patten.The thesis first utilized the 3D software Pro/ENGINEER to accomplish the 3D model of the worm wheel transmission mechanism for the software’s powerful parametic modeling function. Then we used standard data transformation to import the 3D model to ADAMS and add cooresponding constraints and actuations to accomplish the contact impact dynamics and kinematics simulation analysis of this mechanism. Simlation results include transmission ratio、meshing frequency and meshing force. It showed that this virtual mechanism coincided well with the physical prototype after comparing the test results. Therefore, the virtual prototype is feasible and reliable.In order to obtain and acquire the failure mechanism in the test and application, based on the reliable virtual prototype, utilized the finite element software ANSYS (Workbench) to accomplish the statics analysis、non-liner contact analysis and modal analysis. Analysis results consist of the distribution of the stress and strain and the dangerous position, frequency and principle mode, which can conduct how to improve the mechanism and enhance the performance of the motor. The results from finite element analysis showed that this mechanism’s strength meets the requirements. And the results coincided well with the test results. Therefore, the finite element analysis is feasible and reliable. |
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