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首页> 外文期刊>SAE International Journal of Passenger Cars - Mechanical Systems >Durability Design Method of New Stopper Bush Using New Theory (Friction and Spring) for Electric Power Steering
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Durability Design Method of New Stopper Bush Using New Theory (Friction and Spring) for Electric Power Steering

机译：基于新理论（摩擦和弹簧）的新型制动器衬套耐久性设计方法

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摘要

In the automobile industries, weight reduction has been investigated to improve fuel efficiency together with reduction of CO2 emission. In such circumstance, it becomes necessity to make an electric power steering (EPS) more compact and lightweight. In this study, we aimed to have a smaller and lighter EPS gear size by focusing on an impact load caused at steering end. In order to increase the shock absorption energy without increase of stopper bush size, we propose new theory of impact energy absorption by not only spring function but also friction, and a new stopper bush was designed on the basis of the theory. The profile of the new stopper bush is cylinder form with wedge-shaped grooves, and when the new stopper bush is compressed by the end of rack and the gear housing at steering end, it enables to expand the external diameter and produce friction. In this study, we considered the durability in the proposed profile. In particular, the theoretical study was made on the effect due to sliding from the standpoint of the contact pressure and the sliding distance, and durability testing was carried out to check for the durability of the performance after predetermined operation time. After the durability testing, we have examined the force-displacement characteristics, the change in characteristics by thickness reduction agree with the theory. We will report the design method, since the design procedure of the smaller and lighter EPS gear size could be confirmed useful.
机译：在汽车工业中，已经研究了减轻重量以提高燃油效率以及减少CO2排放的方法。在这种情况下，变得有必要使电动助力转向（EPS）更加紧凑和轻便。在这项研究中，我们的目标是通过关注转向端产生的冲击载荷，使EPS齿轮更小，更轻。为了在不增加限位衬套尺寸的情况下增加减震能量，我们提出了不仅通过弹簧功能而且通过摩擦力吸收冲击能量的新理论，并在该理论的基础上设计了一种新的限位衬套。新的限位衬套的轮廓是带有楔形凹槽的圆柱形状，当新的限位衬套被齿条端和转向端的齿轮箱压缩时，它可以扩大外径并产生摩擦。在这项研究中，我们考虑了建议轮廓中的耐久性。特别地，从接触压力和滑动距离的角度对滑移产生的影响进行了理论研究，并且进行了耐久性测试以检查在预定操作时间之后性能的耐久性。经过耐久性测试后，我们检查了力-位移特性，通过减小厚度来改变特性与理论相吻合。我们将报告该设计方法，因为可以确定较小更轻的EPS齿轮尺寸的设计过程是有用的。

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