Abstract: Aiming at the large wear problem happened on the balance valve shaft of the asymmetric twin-scroll turbocharger in an engine endurance test, this paper analyzed the key factor of the wear based on fretting wear model, proposed the number of load cycles is represented by the number of displacement cycles of balance valve shaft sliding back and forth. The results show that the large and frequent reciprocating sliding displacement of the balance valve shaft is the main reason for the wear. The improved solution eliminates the large displacement fluctuation of balance valve shaft, and the durability experiment verifies that the improved solution has low wear of the balance valve shaft.

Key words: Asymmetric twin-scroll; Turbocharger; Balance valve; Fretting wear theory

摘要： 针对某发动机耐久实验中非对称双流道增压器平衡阀轴磨损较大的问题，论文运用微 动磨损模型分析出该磨损的关键因子，提出用平衡阀轴往复滑动的位移循环数来表征载荷循 环数。结果发现，平衡阀轴往复滑动的位移较大且频次较高是该磨损的主要原因，改进后方 案消除了平衡阀的较大位移波动，耐久实验验证了改进方案平衡阀轴磨损较低。

关键词: 非对称双流道；增压器；平衡阀；微动磨损理论