Research on the Working Characteristics of Friction Force of Slide Valve Pair under Low Temperature Working Conditions
The low temperature environment poses many challenges to the aviation hydraulic system.The aviation hydraulic valve is composed of several precision mechanical parts.Due to the different materials and heat treatment processes of different parts,their ther-mal expansion performance in the low temperature environment is also different,which leads to the significant increase of friction of the friction pair of the hydraulic valve,and is prone to the phenomenon of operation stagnation.At present,there is relatively little research on the friction performance of slide valves at low temperatures,especially in specific working conditions such as low-temperature envi-ronments.Further research is needed on the friction performance of slide valves.Taking the friction of hydraulic slide valves in low-tem-perature environments as the research object,theoretical analysis and experimental research on the friction of hydraulic slide valves were conducted,and the micro convex body model and Newton′s internal friction law were used to model and analyze the friction of the fric-tion pairs in the slide valves.The friction force of valve core and valve body under the condition of thermal shock was tested on a low-temperature test rig.The research results indicate that the proposed friction model can reflect the trend of friction force changes in spool valves in low-temperature environments,and can help analyze and predict the friction characteristics of spool valves in extreme low-temperature environments.It has important research significance for the application and design of hydraulic spool valves in low-tempera-ture environments.
low temperature environmentspool valve pairfriction forcehydraulic valve
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