Maintenance of abnormal noise removal and maintenance grease for koyo deep groove ball bearings

In order to judge whether the removed koyo bearing can be reused, it is necessary to check after the deep groove ball bearing is cleaned, and carefully check the condition of the raceway surface, the rolling surface, the mating surface, the wear of the cage, the increase of the bearing clearance, and There are no injuries or abnormalities in which the dimensional accuracy is lowered. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.
Separate bearings such as koyo bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring. Large deep groove ball bearings can not be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of bearings, the more careful inspection is required.
(1) Pumps newly put into use by koyo bearings must be replaced with grease (oil) after 100 hours of operation, and replaced once every 500 hours.
(2) Flow koyo bearings lubricated with grease. After 1500 hours of operation, the grease should be replaced. The amount of oil to be filled should not be too much or too little, because too much or too little grease will cause the deep groove ball bearings to heat up. The amount of fuel is generally controlled at 1/2 to 2/3 of the volume of the bearing chamber.
(3) For bearings lubricated with lubricating oil, the amount of oil should be added to the specified position.
(4) The container containing lubricating oil or grease should be clean and should be sealed properly. There should be no dust, iron filings and other debris to avoid damage to the bearing.
(5) Motor deep groove ball bearings generally use sodium-based grease, which is characterized by high temperature resistance (125 ° C), but is easy to dissolve in water, so it can not be used for lubrication of koyo bearings.

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Technical analysis of maintenance of industrial koyo cylindrical roller bearings

In order to maintain the original performance of the cylindrical roller bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections. As a maintenance item during operation, there are rotary sounds, vibrations, temperatures, and lubricant states of koyo bearings.
   Cleaning of the bearing: When disassembling the cylindrical roller bearing for inspection, first record the appearance of the koyo bearing, confirm the residual amount of the lubricant, and then wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
   The cleaning of the removed bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the bearing does not directly contact the container. When rough cleaning, if the cylindrical roller bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.
The cracking and spalling of the bearing is caused by the cyclic load of the koyo bearing, and the contact surface is prone to fatigue damage. Therefore, in order to improve the service life of the bearing, the bearing steel must have high contact fatigue strength.
Hardness is one of the important qualities of cylindrical roller bearing quality, and has a direct impact on contact fatigue strength, wear resistance and elastic limit. The hardness of the cylindrical roller bearing steel in the state of use generally reaches HRC61~65, so that the koyo bearing can obtain high contact fatigue strength and wear resistance.
The cage is made of nylon 46, which reduces the sliding friction between the ball and the cage. In addition, the uneven shape in the direction of rotation is also eliminated, thereby reducing the agitation loss. In addition, assembly performance is ensured by adopting a shape that can relieve stress at the time of assembly. The loss torque on a single cage is reduced by 30 to 40%, and the overall loss torque of a cylindrical roller bearing is reduced by 50 to 65%. The company speculates that the Prius will increase the fuel efficiency of the 10 and 15 modes from 35.5km/L to 38.0km/L, and about 1-2% of the fuel efficiency is obtained by using such bearings.
In the production process, koyo bearing parts have to go through many cold and hot processing steps. In order to meet the requirements of high volume, high efficiency and high quality, cylindrical roller bearing steels should have good processing performance. For example, cold, thermoforming properties, machinability, hardenability, and the like.

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