Sliding bearing structure of onboard fuel pump

Abstract

The invention belongs to the technology of structural design of onboard fuel pumps, and relates to an improvement of the sliding bearing structure of an onboard fuel pump. The sliding bearing structure is characterized in that a bearing chamber is step blind hole, and a self-aligning mechanism composed of a shaft sleeve (4), a hole check ring (5) and a check ring (6) is provided. According to the improved sliding bearing structure of the onboard fuel pump, a graphite bearing has the self-aligning capacity, the machining difficulty and the machining cost of a part are greatly reduced, the failure of rotating shaft clamping during high-speed rotation of the fuel pump is avoided, and the working reliability of the fuel pump is ensured.

Description

technical field [0001] The invention belongs to the structural design technology of an airborne fuel pump and relates to the improvement of the sliding bearing structure of the airborne fuel pump. Background technique [0002] The structure of the sliding bearing of a current airborne fuel pump can be found in figure 1 , which consists of a housing 1, a shaft 2 and a graphite bearing 3. There is a bearing chamber formed by a blind hole in the housing 1. The graphite bearing 3 is located in the bearing chamber and maintains an interference fit. The left end of the rotating shaft 2 is inserted into the central hole of the graphite bearing 3 and maintains a clearance fit. Its disadvantage is: graphite bearing 3 does not have the self-aligning ability. Since the on-board fuel pump is a long-axis pump driven by a motor, there are motors and impellers on the rotor, and three bearing structures are often used. At present, three ordinary non-adjustable bearings are used, and each ...

AI Technical Summary

Problems solved by technology

Its disadvantage is: graphite bearing 3 does not have the ability of self-alignment

Since the on-board fuel pump is a long-axis pump driven by a motor, there are motors and impellers on the rotor, and three bearing structures are often used. At present, three ordinary non-adjustable bearings are used, and each part needs to have extremely high coaxiality. It is difficult to guarantee it in actual processing, and the processing cost is high; moreover, when the impeller of the fuel pump and the rotor of the motor rotate at high speed, the shaft 2 will undergo a certain deflection and deformation, and a large resistance will be generated at a certain bearing, resulting in a stuck fault. Even cause the pump motor to burn out

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