Water lubricated bearing with high bearing capacity and self lubricity

Abstract

The invention discloses a water lubricated bearing with high bearing capacity and self lubricity. The water lubricated bearing is composed of synthetic polyurethane, a solid lubricant and a fiber reinforcing agent. The bearing has a microstructure being a homogeneous structure, has a hardness of ShoreD55-65, a compression modulus of elasticity of above 600MPa and a dry friction coefficient of 0.20 or less, and has a friction coefficient (water) of 0.25 or less in water environment when the linear velocity is 0.05m / s; and when the linear velocity is greater than 0.5m / s, the friction coefficient (water) is not greater than 0.03, so a use requirement of the radial load of 5-70MPa can be satisfied. When the bearing is in water shortage environment, the bearing has excellent self lubrication and wear resistance performances, can prevent noises and bearing occlusion, and can be widely applied to rotating, swinging or sliding positions of underwater propeller motor drivers, propeller stern bearings, rudder bearings and water pumps.

Description

technical field [0001] The present invention relates to a water-lubricated bearing with high load-carrying and self-lubricating properties, in particular to a bearing with high load-bearing and water-lubricating properties, which exhibits excellent self-lubricating and wear-resistant when the bearing is in a water-deficient environment performance. Background technique [0002] In recent years, people have gradually realized the great significance of protecting the environment and saving energy to the sustainable development of human beings, so the voice of developing new energy-saving and pollution-free products is getting higher and higher. Water-lubricated bearings use water as the lubricating and working medium, which can reduce the environmental pollution of traditional bearings that use oil as the lubricating medium, and save a lot of oil. In addition, water has the advantages of no pollution, wide range of sources, safety and flame retardancy. If water is used instea...

AI Technical Summary

Problems solved by technology

With the extensive research on water-lubricated bearing materials, from the iron plow wood initially used to the current natural rubber and synthetic rubber, the main purpose is to select a material that has a good match with the design and water and has excellent lubricating properties in water. Bearing material, but when the bearing is under water shortage or low speed conditions, sufficient water film cannot be formed in the gap between friction pairs, resulting in the failure of elastohydrodynamic lubrication

Chinese patent CN1098877C relates to a polymer material for ship stern bearings, which is composed of caprolactam monomer, long-chain activator, sodium hydroxide, crystal nucleus reagent and oil compound, and is formed by anion-initiated polymerization. The advantage of this type of material is that it can be conveniently formed into water-lubricated bearings, and the material has high compression resistance. However, during the technical implementation process, the added oil compound cannot be uniformly dispersed inside the material, making the bearing material in After machining, the bearing still exhibits a high coefficient of friction under dry friction conditions

Although nylon has good wear resistance, it still exhibits a high friction coefficient in a low-speed water-deficient environment. At the same time, polyamide has a high water absorption rate, so the bearing will increase in size after long-term immersion in water. Seriously affect the fit clearance of the friction pair. If the clearance is reserved at the initial stage of assembly, it will cause the vibration of the bearing and the instability of the radial force during the initial movement of the bearing due to the excessive clearance, which will seriously affect the service life of the bearing.

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