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Basic knowledge of spherical plain bearings

wallpapers Tech 2020-11-20
Spherical plain bearings are a kind of spherical sliding bearing, which is generally used for low-speed turning motion (that is, angular motion). Because the sliding surface is spherical, it can also be tilted within a certain range (that is, it has a self-aligning effect).
The self-lubricating spherical plain bearings are a special form of spherical plain bearing that does not need to be supplemented with lubricant. It is to paste a self-lubricating cushion on the inner spherical surface of the outer ring of the bearing and replace the sliding friction on the steel surface with the sliding friction of the sliding surface of the cushion to the outer spherical surface of the inner ring.
The advantages of spherical plain bearings are compact structure, lightweight, impact resistance, strong safety and reliability, and long life. Compared with ordinary spherical plain bearings, self-lubricating spherical plain bearings have the characteristics of no need for a regular oil change, strong load-bearing capacity, good chemical stability, low friction coefficient, good thermal conductivity, and corrosion resistance.
 
About the surface treatment of self-lubricating spherical plain bearings
 
The surface treatment is necessary to improve bearing surface strength, wear resistance, corrosion resistance and service life
means. The self-lubricating gasket is usually pasted on the inner spherical surface of the outer ring of the spherical plain bearing. The outer spherical surface of the inner ring must be treated with special processes, such as surface phosphating and chrome plating. Therefore, when the self-lubricating gasket forms a friction pair with the outer spherical surface of the inner ring, Can get more excellent working performance. For example, SKF provides a self-lubricating spherical plain bearing with a ceramic coating on the inner and outer spheres for helicopter manufacturers. The material of the inner and outer rings is stainless steel. The outer ring is cold-formed with the inner ring as the mold, and the inner spherical surface of the outer ring is glued with PTFE. /Glass fiber woven composite liner, this kind of self-lubricating spherical plain bearing has a greater bearing capacity and longer life. It is mainly used in the primary and secondary flight control systems of helicopters.
The inner and outer rings of the self-lubricating spherical plain bearing use different materials and need to be processed to obtain
Good self-lubricating performance. Self-lubricating spherical plain bearing inner ring adopts titanium alloy to reduce weight. Because titanium alloy has a lower hardness than stainless steel and copper alloy, the outer spherical surface of the inner ring is more likely to be scratched and damaged during operation. The outer spherical surface also accelerates the damage and damage of the self-lubricating gasket. Wear. The surface treatment of the outer spherical surface of the titanium alloy inner ring is proposed to form a nitride permeable layer. When the inner ring of a self-lubricating spherical plain bearing is made of aluminum alloy, the hardness of the aluminum alloy is low, and the spherical surface of the bearing inner ring is hard anodized, and the other surfaces are treated with chromic acid anodization.
 
Self-lubricating spherical plain bearing performance experiment
 
Through experimental research, analyze the factors affecting the performance of self-lubricating spherical plain bearings, evaluate the adoption of new materials and the design of new structures, and summarize the general failure modes of self-lubricating spherical plain bearings. Factors affecting the performance of self-lubricating spherical plain bearings: load, swing angle, speed, temperature, pollutants and impurities, etc. The self-lubricating spherical plain bearing can bear the deformation under the action of radial static load of radial force, axial force, radial force and axial force.

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