Sealing mechanism of locking clamping jaw wear-resistant hydraulic pump transmission shaft

Abstract

The invention discloses a sealing mechanism of a locking clamping jaw wear-resistant hydraulic pump transmission shaft. 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 notches (28). The rear cover bushing (3) are provided with locking clamping jaws (27) matched with the notches (28). Therear cover bushing (3) is made of martensite stainless steel. The outer diameter of the sealing bushing (18) is greater than or equal to that of the locking clamping jaws (27). The difference value between the outer diameter of the sealing bushing (18) and the outer diameter of the locking clamping jaws (27) is less than or equal to 7 mm. The grade of the martensite stainless steel is 1Cr17Ni2. The sealing mechanism has the advantage that the oil leakage amount is not likely to exceed the standard. The situation that an airplane hydraulic system cannot operate normally and a disastrous accident occurs due to increase of the oil leakage amount can be avoided.

Description

technical field [0001] The invention belongs to the sealing field of a hydraulic pump of an aircraft hydraulic system, and in particular relates to a sealing mechanism of a transmission shaft of a hydraulic pump with a wear-resistant stop claw. Background technique [0002] The sealing mechanism of the transmission shaft of the hydraulic pump of the aircraft hydraulic system usually adopts a structural form combining mechanical seal and sealing ring seal, which is widely used in hydraulic pumps at home and abroad. The mechanical seal includes a sealing bush (also known as a fixed ring) and a toothed ring (also known as a moving ring). Tight, can guarantee a certain sealing effect under the condition of static and relative rotation. [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 plate and the rotor, the gap between the sliding shoe and the...

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

Images