Lubrication Characteristics of Electric Sliding Contacts Consisting of Rotating Circular Grooved Disk and Stationary Rider With Spherical Surface Under Lubricated Condition
Lubrication Characteristics of Electric Sliding Contacts Consisting of Rotating Circular Grooved Disk and Stationary Rider With Spherical Surface Under Lubricated Condition
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DOI：
10.1115/1.4031393
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发表时间：
2016
影响因子：
2.5
通讯作者：
S. Kaneko;H. Taura;Ryosuke Fukasawa;H. Kanai
中科院分区：
文献类型：
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作者：
S. Kaneko;H. Taura;Ryosuke Fukasawa;H. Kanai
电动滑动接触器广泛应用于家电、汽车等各种电气元件中。本研究的目的是通过圆形槽盘和球面滑座的组合来提高在润滑条件下工作的电滑动接触器的性能特性。进行了实验和理论分析，以研究旋转盘表面上的圆形凹槽的横截面积对摩擦特性和导电率的影响。实验分析采用销盘式摩擦测试仪测量润滑条件下滑动接触件之间的摩擦力和接触电压。还用雷诺方程计算了油膜力以及骑手与盘之间的摩擦力，发现它们与实验结果密切对应。本研究获得的结果表明，增加圆盘上圆形凹槽的横截面积，可以将产生金属接触的操作条件延长到更高的轴承特征数S值，该特征数S由eta U0L0 lambda/W定义（eta是润滑油粘度，U-0是滑动速度，L-0是径向宽度中间滑动方向上的滑道弧长，W是施加的载荷，lambda是滑道的长宽比），并且还降低了摩擦力骑手可以与盘表面接触的 S 的最大值。这些都是预料之中的，因为被拖入接触区域的上游润滑油往往很容易沿着圆形凹槽泄漏，从而在骑手和盘之间产生较低的油膜力并增强金属接触。
Electric sliding contacts are widely used in various electrical components such as for home appliances and automobiles. The purpose of the present study is to improve the performance characteristics of the electric sliding contacts operating under the lubricated condition by the combination of circular grooved disk and rider with a spherical surface. The experimental and theoretical analyses have been carried out to investigate the effect of cross-sectional area of circular grooves provided in the rotating disk surface on the frictional characteristics and the electrical conductivity. The experimental analysis is conducted with a pin-on-disk friction tester to measure the frictional force and the contact voltage between the sliding contacts under the lubricated condition. The oil-film force and the frictional force between the rider and disk are also calculated with the Reynolds equation and they are found to be closely corresponding to the experimental results. The results obtained in the present study show that increasing the cross-sectional area of the circular grooves on the disk extends the operation condition yielding the metal contact to a higher value of the bearing characteristic number S, which is defined by eta U0L0 lambda/W (eta is the lubricant oil viscosity, U-0 is the sliding velocity, L-0 is the rider arc length in the sliding direction at the middle of radial width, W is the applied load, and lambda is the aspect ratio of rider), and also decreases the frictional force at the maximum value of S at which the rider could contact with the disk surface. These are expected since upstream lubricant oil dragged into the contact region tends to easily leak out along the circular grooves, yielding a lower oil-film force between the rider and disk and enhancing the metal contact.