A wear-resistant sealing mechanism for a hydraulic pump drive shaft for stopping jaws

Abstract

The invention discloses a wear-resistant sealing mechanism for a hydraulic pump transmission shaft of a stopper claws. The sealing mechanism of the transmission shaft is provided with a sealing bushing (18) and a rear cover bushing (3). The sealing bushing (18) is provided with a gap (28), the rear cover bushing (3) is provided with a stop claw (27) matched with the gap (28), and the rear cover bushing (3) is made of horse Sterile stainless steel, the outer diameter of the sealing bush (18) is greater than or equal to the outer diameter of the stop claw (27), the outer diameter of the sealing bush (18) and the outer diameter of the stop claw (27) The difference between them is less than or equal to 7mm; the grade of the martensitic stainless steel is 1Cr 17 Ni 2 . The invention has the advantages that the amount of oil leakage is not easy to exceed the standard, and can avoid the failure of the aircraft hydraulic system to work normally and the occurrence of catastrophic accidents caused by the increase of the amount of oil leakage.

Description

technical field [0001] The invention belongs to the field of sealing of hydraulic pumps of an aircraft hydraulic system, in particular to a sealing mechanism of a hydraulic pump drive shaft with wear-resistant stopping claws. Background technique [0002] The sealing mechanism of the transmission shaft of the hydraulic pump of the aircraft hydraulic system usually adopts the structural form combining the mechanical seal and the sealing ring seal, which is widely used in hydraulic pumps at home and abroad. The mechanical seal includes a sealing bushing (also known as a fixed ring) and a toothed ring (also known as a moving ring). It can ensure a certain sealing effect under the conditions of static and relative rotational motion. [0003] During the working process of the hydraulic pump, the hydraulic oil enters the pump cavity through the gap between the rotor and the plunger, the gap between the oil separator and the rotor, the gap between the slipper and the wear-resistan...

AI Technical Summary

Problems solved by technology

[0008] The hazards of excessive oil leakage of the hydraulic pump drive shaft: The excessive oil leakage of the hydraulic pump drive shaft may cause the oil in the fuel tank of the aircraft hydraulic system to decrease rapidly, causing the aircraft hydraulic system to fail to work normally; the oil leaked out of the standard A large number of accumulations in the engine compartment will cause catastrophic accidents if exposed to open flames

[0009] Therefore, the existing sealing mechanism of the drive shaft has the disadvantage that the amount of oil leakage is easy to exceed the standard, which may cause the aircraft hydraulic system to fail to work normally and cause catastrophic accidents

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