A kind of electrical insulation high temperature resistant hybrid ball bearing and its preparation method

Abstract

The invention relates to an electric insulation high-temperature resistant hybrid ball bearing and a preparation method thereof, and belongs to the technical field of rolling bearings. According to the electric insulation high-temperature resistant hybrid ball bearing, silicon nitride ceramic balls are used as rolling bodies between the inner ring and the outer ring of the bearing, and a polyether-ether-ketone retainer is adopted at the same time, so that the insulation effect is achieved, the electric corrosion is thoroughly avoided, and the service life of the bearing is prolonged. The thermal expansion coefficient of the silicon nitride ceramic balls is small, and the silicon nitride ceramic balls are prevented from expanding caused by the temperature in the high-temperature environment; by adopting the polyether-ether-ketone retainer, the normal working reliability of the bearing in the high-temperature state is guaranteed; the use temperature of the whole bearing is improved by combining the small thermal expansion coefficient of the silicon nitride ceramic balls and the adoption of the polyether-ether-ketone holder, and the bearing can resist the temperature of 200 DEG C or above; a solid lubricating material layer is sprayed between the retainer and the silicon nitride ceramic balls so as to avoid the premature damage of a common bearing caused by grease drying; According to the preparation method of the electric insulation high-temperature resistant hybrid ball bearing, the raw materials are easy to obtain, and the preparation method is stable and reliable, and suitable for large-scale production.

Description

technical field [0001] The invention relates to an electric insulation bearing, in particular to an electric insulation high temperature resistant hybrid ball bearing and a preparation method thereof, belonging to the technical field of rolling bearings. Background technique [0002] With the development of my country's economy and society, the application range of motor bearings is becoming more and more extensive. At the same time, the environment and working conditions for rolling bearings in the motor industry are becoming increasingly harsh and diversified. The ordinary steel bearings currently used are difficult to meet the requirements of special working conditions. Especially in some occasions such as high voltage motors, servo motors, variable frequency speed regulating motors, etc., the bearings cannot effectively prevent the erosion of current during use, causing damage and causing the bearings to fail early. [0003] The electric corrosion of the bearing is caus...

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Problems solved by technology

The passage of current will also cause the structure of the lubricating grease in the bearing to change, and the local high temperature will cause the additive to react with the base oil, which will cause the base oil to burn or carbonize, and the lubricating grease will rapidly decay and become black and hard

[0005] In order to overcome the problem of electric corrosion of bearings, the following three methods are used in the electric insulation bearings of the prior art: (1) The outer ring of the bearing is sprayed with a ceramic coating, such as the invention patent authorization announcement number CN10052009C provides an insulation bearing device method, the patent application scheme is to install an insulating layer on the part where the bearing and the fastener on the bearing device are in contact. The whole process of this scheme is relatively complicated, and the manufacturing efficiency is low, which is not conducive to industrial mass production; (2) the outer ring of the bearing is coated with resin , but there are long-term use, the coating is easy to wear and fall off, and when the working temperature exceeds 200 ° C, it will age or deform under high temperature conditions to cause bearing damage; (3) use ceramic rolling elements, such as the invention patent application publication number CN1706980A discloses a rolling bearing surface insulation layer processing technology, the patent scheme can make up for the defects of the first two patents, but, because the coating material it adopts is Al 3 o 2 -TiO 2 , therefore, poor insulation performance

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