Stress-free lubricating passage structure

Abstract

The invention discloses a stress-free lubricating passage structure, which comprises a main bearing, a bushing and a base body, wherein the bushing is provided with a center hole, the base body is provided with a center hole, the main bearing is arranged in the center hole of the bushing and can rotate around the axial line of the main bearing, the bushing is arranged in the center hole of the base body and is in interference connection with the base body, a lubricating oil passage is arranged between the main bearing and the bushing, a lubricating ring is arranged on the main bearing shaft in an interference sleeving way, an oil injecting seat is arranged on the lubricating ring, an oil injecting nozzle is arranged on the oil injecting seat, and the oil injecting nozzle, the oil injecting seat, the lubricating ring and the lubricating oil passage are communicated to form an oil injecting passage. The stress-free lubricating passage structure has the advantages that the fatigue lifetime of a structural element is prolonged, and the installation and maintenance performance of the structural element is improved.

Description

technical field [0001] The invention relates to the field of aircraft landing gear structure design, in particular to a stress-free lubricating channel structure for important rotating parts of the aircraft landing gear. Background technique [0002] The landing gear is an important component of the take-off and landing of the aircraft. The failure of each part or component will cause the damage of the landing gear structure or the loss of the mechanism function. Therefore, the design of each part of the landing gear needs to take into account the details. Fatigue or crack effects. For landing gear joints, especially the lubrication design of important rotating parts, it directly affects the loading conditions and mechanical properties of main structural parts. [0003] The lubrication of landing gear joints not only helps to prevent corrosion and enhance the performance of parts, but also helps to disassemble the joints during repairs, bringing convenience to the installat...

AI Technical Summary

Problems solved by technology

figure 1 Among them, the thread is directly tapped on the base body, and the threaded oil nozzle is used for direct connection. The disadvantage of this method is: the thread passing through the entire wall thickness or located on the basic force transmission route will produce additional local pressure under repeated loads. Stress concentration and potential source of cracks, and the sharp edges and corners of machined threads are also prone to fatigue cracks

figure 2 Among them, the installation hole is directly tapped on the substrate, and the grease nozzle is directly pressed into the structural part by means of interference assembly. The disadvantage of this lubrication method is that the interference assembly may generate additional stress growth and cause cracking, and it is not convenient Later dismantling and maintenance

image 3 Among them, the mandrel is added to the main bearing shaft, and the auxiliary lubrication channel is opened to achieve the purpose of multiple lubrication. The disadvantage of this lubrication method is that it is easy to generate cracks through the transverse lubrication hole of the main bearing shaft, which in turn leads to the failure of structural parts.

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