In order to study the sealing characteristics of series VL-type seal in low temperature ambient, firstly, this paper

takes the series VL-type seal for the retracting and releasing actuator of a certain type of aircraft landing gear as an

example, test the stress-strain data of seal material of polytetrafluoroethylene and nitrile butadiene rubber under

different ambient temperatures. Secondly, the finite element analysis software ABAQUS is used to establish a two dimensional axisymmetric model of series VL-type seal, and a mixed lubrication model of reciprocating series VLtype seal is established. Taking friction force and leakage as evaluation indicators, the influence of ambient temperature, medium pressure and reciprocating speed on sealing characteristics is analyzed based on actual working

conditions. The results show that with the decrease of ambient temperature, the resilience of the VL-type seal decreases, the contact pressure and contact width of the sealing surface are decrease, the intermediate pressure increases, and the net leakage increases. With the increase of the reciprocating speed, the dynamic pressure effect of

fluid increases, the oil film thickness increases, the friction force decreases, and the net leakage increases. With

the increases of medium pressure, the contact pressure and friction force of the series VL-type seal in increases,

and net leakage increases.

landing gear, low temperature ambient, series VL-type seal, mixed lubrication, sealing performance