Maintenance of cylindrical roller bearings

Disassembly of cylindrical roller bearings

The disassembly of cylindrical roller bearings is carried out during regular maintenance and bearing replacement. After disassembly, if you continue to use it, or when you need to check the condition of the bearing, you should disassemble it as carefully as you did during installation. Be careful not to damage difficult-to-operate bearing parts, especially the disassembly of interference-fit bearings. It is also very important to design and manufacture tools for disassembling cylindrical roller bearings as required. When disassembling, please study the disassembly method and sequence according to the drawings, and study the matching conditions of the bearing to ensure the safety of the disassembly operation. Disassembling the outer ring For the outer ring with interference fit, please tighten a few screws in advance to squeeze the outer ring onto the circumference of the outer ring. Tighten the screws evenly when removing. These screw holes are usually covered by blind hole plugs and separable bearings (such as tapered roller bearings). There are multiple cuts on the barrier shoulder of the shell. Use the mat to remove it or tap it. The disassembly of the inner ring is the easiest to pull out with a press. At this time, please pay attention to the tension of the inner ring. In addition, most of the pull-out clamps shown are used, and regardless of the clamp, it must be firmly clamped to the side of the inner ring. Therefore, it is necessary to consider the size of the shoulder of the shaft or study the processing method of the groove on the shoulder to use the drawing jig. The oil pressure method is used for the inner ring disassembly of large bearings. Apply oil pressure through the oil hole on the bearing to facilitate suction. For large-width bearings, the hydraulic method and drawing fixtures are disassembled together. Induction heating can be used to disassemble the inner ring of cylindrical roller bearings. A method of heating the part in a short time to expand the inner ring and then pulling it out. Where a large number of inner rings of such bearings need to be installed, induction heating can also be used. Cleaning the cylindrical roller bearing When disassembling the bearing for inspection, please record the appearance by taking pictures or other methods. In addition, before cleaning the bearing, confirm the amount of remaining lubricant and sample the lubricant. One. The cleaning of the bearing is divided into rough washing and fine washing, and a metal grid can be placed on the bottom of the used container. b. When performing rough washing, use an oil brush to remove grease or attachments. If the bearing rotates in oil at this time, please be aware that the rolling surface may be damaged by foreign objects. C. When performing fine cleaning, slowly rotate the bearing in oil and must be careful. Commonly used cleaning agents are neutral non-aqueous diesel or kerosene, and sometimes lye is used as needed. No matter which cleaning agent is used, it must be filtered frequently to keep it clean. After cleaning, apply anti-rust oil or anti-rust grease to the bearing immediately.