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RACK ROLLING을 고려한 R/P GEAR SYSTEM 설계
한현식(Hyunsik Han),손명섭(Myungseob Son),허성무(Sean Heo) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The change in energy paradigm according to global eco-friendly policies is accelerating popularization of electric vehicles, and as the time of sharing economy and autonomous car is coming, steering system is also facing new challenges. As part of that, in order to cope with increase in the weight of electric vehicles and rapid increase in mileage of autonomous vehicles, each supplier need to ensure reliability of their R/P Gear system(DP-EPS, SbW, MRP) under more severe conditions. In this paper, in order to improve the reliability of the rack(or pinion) tooth, which are the main parts of the system, a factor called ‘Stress factor’, which is independent from the contact ratio and another factors that have been used traditionally, is introduced to examine stress concentration phenomenon which is occurred on tooth by ‘Rack rolling’. The factor is validated by comparing it with our past test history, and furthermore, a review tool is created using excel so that engineers can use it easily. By confirming the durability of the gear in advance through this paper, reliable data can be presented when trying to receive contracts, and time and cost can be reduced by preventing design changes related to tooth failure that may occur during the development process.
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