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飞机液压系统橡胶密封圈必须保证在很宽的温度范围内具有良好的密封性和耐久性。密封圈在使用过程不仅要遇到高温条件,而且要遇到高空低温(-55～-60℃)和地面冬季低温(-20～-40℃)。实践证明,在低温-20～-60℃最容易发生漏油的情况。因此,怎样制订用于液压系统密封的橡胶材料标准的耐寒性指标是值得探讨的。现就英、美、法、苏和我国飞机液压系统橡胶耐寒性指标情况扼要地介绍如下。
Aircraft hydraulic system rubber seals must ensure good tightness and durability over a wide temperature range. Sealing ring in the course of not only to encounter high temperature conditions, but also to encounter the high-altitude low-temperature (-55 ~ -60 ℃) and the ground in winter low temperature (-20 ~ -40 ℃). Practice has proved that the lowest temperature -20 ~ -60 ℃ the most prone to oil spills. Therefore, it is worth discussing how to formulate the standard cold resistance index of the rubber material used for sealing the hydraulic system. Now on the United Kingdom, the United States, France, the Soviet Union and China’s aircraft hydraulic system rubber cold resistance index briefly described below.