| Summary: | 碩士 === 南台科技大學 === 奈米科技研究所 === 99 === The four wheel steering (4WS) can be classified into two types, i.e. (1) the type of four independent wheel and (2) the type of mechanism transmission, in which the type of four independent wheel have been studied widely. However, Because of the factors of stability and safety are considered, the type of mechanism transmission is generally applied to the practical design now. Therefore, the steering mechanism of the type of mechanism transmission with changing the angle function is studies in this paper. Based on the safety of mechanism operation, the characteristic of operation and degree of freedom will be increased.
The main design topic in many kinds of 4WS system is for reducing the slip angle. The central mechanism is the key device for connecting the front and rear wheel steering in the 4WS system. The purpose of this paper is to design the configurations of central mechanisms for mechanism type 4WS systems using planer linkages. The central mechanisms and their characteristics are analyzed. The design method and flowchart for the central mechanisms are presented, and some concepts are yielded by the method. The synthesized results are evaluated for some specific requirements. The generated results will be analyzed by the software. The computer model and its prototype are manufactured. For the purpose of weight-down, the type of bearing of the central mechanism synthesized can be considered with the journal bearing used for lighting load, and its material is selected with aluminum alloy. These surfaces of bearing can be treated by two micro-structure technologies, i.e. (1) spraying molybdenum disulfide (MoS2), (2) treating graphite film. The micro-structure and BEI (TOPO) can be analyzed by the microscope.
The generated results of this paper are listed as follows:
1. The central mechanisms and their characteristics are analyzed completely.
2. A design method and its flowchart for the central mechanisms are presented and some design concepts are yielded by this method for examples.
3. The synthesized results are evaluated for some specific requirements. The optimal result is decided.
4. A computer model is drawn and a prototype is also manufactured.
5. The basic material of journal bearing in the central mechanism is aluminum alloy. The micro-structures of bearing surfaces with spraying molybdenum disulfide (MoS2) and treating graphite film will be investigated by the SEM.
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