“鹅颈”式有限转角导电滑环疲劳特性研究

Study on Fatigue Characteristics of “Goose-neck” Type Limited Angle Conductive Slip Ring

针对"鹅颈"式有限转角导电滑环疲劳寿命预估难的问题,通过对滑环工作原理和运动受力的分析,得到了滑环失效的主要形式为FPC导体层断裂,失效位置为FPC(内环)和FPC(鹅颈)交界处。采用能量法建立了"鹅颈"式滑环的疲劳寿命预估模型,通过对模型的分析表明,在一定范围内,滑环疲劳寿命随着内环转动角度、滑环内外环半径比和FPC导体层厚度的增大而减小。开展滑环疲劳寿命试验进行验证,试验结果表明,滑环在经历了2.66E+06 cycles往复回转后,达到疲劳使用寿命,理论计算结果与试验结果相比误差在5%以内。

In view of the problem that it is difficult to predict the fatigue life of the"goose-neck"type limited angle conductive slip ring,through the analysis of the working principle and the movement force of the slip ring,it is found that the main failure mode of the slip ring is the FPC conductor layer fracture;the failure position is at the junction of the FPC(inner ring)and the FPC(goose-neck).The fatigue life prediction model of slip ring is established by energy method.The analysis of the model shows that the fatigue life of slip ring decreases with the increase of the rotation angle of the inner ring,the radius ratio of the slip ring inner ring to the slip ring outer ring and the thickness of FPC conductor layer.The fatigue life test is carried out to verify.The results show that after 2.66 E+06 cycles reciprocating rotation,the slip ring has reached the fatigue service life.The error between the theoretical calculation results and the test results is within 5%.