【摘要】汽車電動助力轉向（EPS）系統是近些年來出現的新型動力轉向系統。與傳統的動力轉向（PS）相比較，汽車電動助力轉向系統（EPS）結構簡單、成本低、靈活性好、能充分的滿足汽車轉向性能的要求，在轉向操作的舒適性、安全性和節能、環保等方面顯示出顯著的優越性。
電動助力轉向（EPS）系統主要由扭矩傳感器、車速傳感器、電了控單元、無刷直流電動機、電磁離合器和減速機構等部分組成。在相應的軟件及控制算法的協助下，共同實現轉向助力的功能。
本文簡要介紹了汽車轉向系統，在明晰了EPS的組成和工作原理后，選擇了轉向柱助力式電動助力轉向系為研究方向，對與電機相連的減速機構進行設計，并完成基于SolidWorks軟件的實體造型設計。
【關鍵】EPS；減速機構；SolidWorks
Automotive Electric Power Steering （EPS）system entity modeling design Based on SolidWorks
[Abstract] Electric Power Steering system（EPS）is a new power steering system，which emerged in recent years，uses an electric motor to provide assistance．From EPS emerged，the automotive industry attaches more and more importance to it．Comparing with traditional steering system the EPS of the automobiles is simple in structure，more flexible，and can fully meet the requirements of steering performances．EPS also has prominent advantages in the comfortableness and security of steering，energy saving，and environmental protection．
EPS system mainly combines the torque sensor，velocity sensor，electric control unit，electromagnetic clutch and gear down machine etc．In order to make the EPS run，we design the software fitting for the EPS’s hardware，and the control arithmetic．
The paper briefly introduces the automobile steering system．As EPS’s composition and working principle is clear，I have chosen column drive electric power steering system to be my researching direction．During the whole design course，the transmission connected with the motor and entity modeling design based on SolidWorks have completed．
[Keywords] Electric Power Steering；transmission；SolidWork
