Oil-pollution-preventing cylinder seat assembly and oil-pollution-preventing method thereof

Abstract

The invention discloses an oil-pollution-preventing cylinder seat assembly and an oil-pollution-preventing method thereof. The oil-pollution-preventing cylinder seat assembly comprises a cylinder seat and hydraulic cavities formed in the cylinder seat, the hydraulic cavities are evenly distributed on the same circular track, and pistons are arranged in the hydraulic cavities; dry type return mechanisms are arranged between the adjacent hydraulic cavities, and the dry type return mechanisms are uniformly distributed on the same circular track; and the dry type return mechanisms are connected with a pressing ring, and the pistons can push the pressing ring to move in the direction away from the air cylinder seat. The dry type return mechanisms are adopted to reset the pressing ring, the dry type return mechanisms are not connected with the hydraulic cavity through an oil way, the dry type return mechanisms are not connected with the pistons, impurities or chippings generated when the dry type return mechanisms operates cannot enter an oil liquid, the pollution of impurities or chippings generated in the operation process of the dry type return mechanisms to oil can be avoided, and therefore the oil is ensured to meet a standard.

Description

technical field [0001] The invention relates to the technical field of aircraft braking devices, in particular to a cylinder block assembly for preventing oil pollution and a method for preventing oil pollution. Background technique [0002] Cylinder block, piston, pull-back mechanism, etc. constitute the cylinder block assembly, and the cylinder block is the main working component of the aircraft brake device. Cylinder blocks are generally made of aluminum castings. When the internal pressure of the cylinder block is required to be high, aluminum forgings can be used. Generally, the pollution level of oil in the cylinder block should not be higher than the 7th grade of GJB 420B; the temperature of the cylinder block is not allowed to exceed 150°C to prevent the aging of the sealing ring and oil. The dynamic sealing ring in the cylinder block assembly is generally an O-shaped rubber sealing ring, which is simple and reliable in sealing, but it is easy to age at high temper...

AI Technical Summary

Problems solved by technology

After the cylinder block assembly has been used for a certain period of time, due to the aging and wear debris of the cylinder seat seal ring; the peeling off of the surface coating in contact with the oil; Greater than the 7th level of GJB 420B; it may cause problems such as servo valve blockage in the brake system and insensitive piston action

[0003]Application publication number is the Chinese patent of CN 107878737 A disclosing a kind of aircraft brake wheel, all is provided with return force spring structure in each piston, after braking, The return spring structure is used to reset the piston, but the operation of the return spring will inevitably cause pollution to the oil to a certain extent, such as debris or impurities. Therefore, the oil in this solution may no longer meet the requirements after long-term use. Standard requirements; the authorized announcement number is that the Chinese patent of CN 207860438 U discloses a kind of variable-diameter piston linkage type automatic return mechanism, and this mechanism is provided with two kinds of specifications of the large piston and the small piston on the cylinder seat of the brake wheel. The large piston is equipped with a return mechanism, and the small piston is no longer provided with a return mechanism. However, there is still the possibility that the return spring in the return structure may contaminate the oil with impurities or debris during operation. Therefore, this scheme is still possible. The oil does not meet the standard requirements

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