Maintenance technology analysis of industrial koyo cylindrical roller bearings

In order to maintain the original performance of cylindrical roller bearings in good condition for as long as possible, maintenance and overhaul are required to prevent accidents before they occur, to ensure the reliability of operation, and to improve productivity and economy. Maintenance should preferably be carried out on a regular basis according to the operating standards corresponding to the operating conditions of the machine. The contents include monitoring the operating status, replenishing or replacing lubricants, and regular disassembly inspections. As the maintenance items during operation, there are the rotation noise, vibration, temperature, and the state of the lubricant of the koyo bearing. Bearing cleaning: When removing the cylindrical roller bearing for maintenance, first record the appearance of the koyo bearing, confirm the residual amount of lubricant, and wash the bearing after sampling the lubricant for inspection. As the cleaning agent, gasoline and kerosene are generally used. The cleaning of the dismantled bearing is divided into coarse cleaning and fine cleaning, which are placed in the container respectively, and the bottom of the metal mesh is placed first, so that the bearing does not directly contact the dirt of the container. During rough cleaning, if the cylindrical roller bearing is rotated with dirt, it will damage the rolling surface of the bearing, so be careful. In the rough cleaning oil, use a brush to remove grease and adhesions. After it is roughly clean, transfer to the fine cleaning. The cracking and spalling of the bearing is caused by the fact that the contact surface of the koyo bearing is prone to fatigue damage under the action of cyclic load, so in order to improve the service life of the bearing, the bearing steel must have a 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 cylindrical roller bearing steel in the use state generally reaches hrc61~65, so that the koyo bearing can obtain higher 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 concave-convex shape in the rotation direction is eliminated, thereby reducing the stirring loss. In addition, by adopting a shape that can relieve stress at the time of assembly, assembly performance is ensured. The loss torque on a single cage is reduced by 30 to 40%, and the loss torque of the cylindrical roller bearing as a whole is reduced by 50 to 65%. The company speculates that the Prius has increased the fuel efficiency of the 10-mode and 15-mode models from the previous 35.5km/l to 38.0km/l, and that about 1 to 2% of the improved fuel efficiency is obtained by adopting this bearing. In the production process of koyo bearing parts, many cold and hot working processes are required. In order to meet the requirements of large batches, high efficiency and high quality, cylindrical roller bearing steel should have good processing performance. For example, cold and hot formability, machinability, hardenability, etc.

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