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黑龍江工程學院本科生畢業(yè)設計
摘 要
電動助力轉向系統(tǒng)就是在機械轉向系統(tǒng)中,用電池作為能源, 電動機為動力, 以轉向盤的轉速和轉矩以及車速為輸入信號, 通過電子控制裝置, 協(xié)助人力轉向, 并獲得最佳轉向力特性的伺服系統(tǒng)。EPS汽車轉向系統(tǒng)的性能直接影響到汽車的操縱穩(wěn)定性, 對于確保車輛的安全行駛、減少交通事故以及保護駕駛員的人身安全、改善駕駛員的工作條件起著重要的作用。
電動助力轉向系統(tǒng)主要由減速機構和轉向機構組成，減速機構把電動機的輸出經(jīng)過減速增扭傳遞到動力輔助單元，實現(xiàn)助力。由于蝸輪蝸桿傳動比大，傳動平穩(wěn)噪聲低故減速機構選為蝸輪蝸桿式。由于齒輪齒條式轉向器，傳動平穩(wěn)，結構簡單故轉向機構選為齒輪齒條式。
本文設計研究了電動助力轉向系統(tǒng)，對其工作原理做了闡述，對蝸輪蝸桿減速器中的蝸輪與蝸桿做了詳細的設計計算，并進行了選型。同時對齒輪齒條式轉向器的結構進行分析，并對其重要零件進行了設計計算與強度校核。
關鍵字：減速器；轉向器；設計；齒輪；軸；校核
ABSTRACT
Electric power steering system is in mechanical steering system, use battery as energy, motor as a driving force, the steering dish speed and torque and speed of the input signal, through the electronic control unit, to help the human steering, and get the best to force characteristics of servo system. EPS automobile steering system performance directly influence to the car's steering stability, to ensure that the vehicle's safety driving, reduce the number of traffic accidents and protecting the personal safety of the driver, improve the working conditions of the driver plays an important role.
Electric power steering system mainly consists of deceleration institutions and steering mechanism composition, slowing institutions to increase the output after slowing motor relay to the power auxiliary units twisted, realize the power. Because worm transmission large and stable transmission low noise so slow institutions elected worm type. Because rack-and pinion steering gear-component with simple structure, stable transmission, is steering mechanism selected for rack-and pinion type.
The paper presents the design of electric power steering system was studied, the principle of work of worm gear and worm reducer elaboration, the worm gear and worm to do a detailed design calculation, and a selection. Meanwhile to the structure of rack-and pinion steering gear-component are analyzed, and the important parts of the design calculation and strength check.
Keywords : reducer; steering gear; Design; Gear; Axis;Checking
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