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      Q&A

      Typical questions in Bearing Installation and Usage

      2013-08-19
      ?1. Precautions for Bearing Use
      A. Keep bearings and their surroundings clean, even invisible tiny dust entering the bearing will cause abrasion, vibration and noise.
      b. Be careful in installation. Neither brute force punching nor hammering on the bearing is allowed. Never transmit a load through the rolling element during installation.
      c. Use the proper installation tools; use special tools as much as possible; cloth or non-lint free cloth should be avoided.
      d. Prevent bearings from rusting; while picking up the bearing by hand, wash the sweat of the hands and coat it with high quality mineral oil before operation. In rainy season and summer, special attention shall be made to antirust.
      2. Questions during Roller Bearing Installation
      2.1 Any requirements for installing surface and site?
      Yes. Any foreign particles such as scrap iron, rag, dust; etc, entering the bearing may cause noise and vibration, or even damage the bearing raceways and rolling elements. Therefore, before the bearing installation, you must ensure the cleanness of the installation surface and the environment.
      2.2. Does the bearing have to be cleaned before installation?
      As the bearing surface is coated with antirust oil, you must clean the bearing carefully with clean gasoline or kerosene, and then coat it with clean lubricating grease of superior quality or high speed before installation and operation. Cleanness is a crucial factor for the bearing life. However, one point should be paid special attention: Sealed bearings do not need to be cleaned before installation.
      2.3. How to choose grease?
      Lubrication has an extremely important effect on the bearing operation and bearing life. Here we’d like to make a brief introduction to the general principles on how to choose a type of grease. Greases consist of base oil, a thickening agent and additives. Different kinds and brands of the same grease may differ greatly in performance; special attention should be paid to the limiting speed of the grease. The main property of the grease depends on the base oil. Generally, Low-viscosity oil is used for high-speed or low ambient-temperature applications. High viscosity oil is used for high load or high-ambient-temperature applications the thickener also affects the lubricating property, whose water tolerance determines the water tolerance of the grease. In principle, greases of different brands should not be mixed. Also, even greases with the same thickener exert adverse effects to each other due to different additives.
      2.4 While lubricating the bearing, is it better to use more grease?
      It is a common mistaken concept that while lubricating the bearing, the more grease used, the better the lubrication is. Too much grease in the bearing and the bearing housing will lead to excessive churning which results in extremely high temperature.
      2.5 How to install and Remove a bearing?
      Hammering on the bearing end face and the non-thrust face is not allowed during bearing installation. A block, a sleeve or other installation tools should be used instead to distribute the installation force evenly on the bearing. The installed surface could be coated with lubrication oil to smooth the bearing installation. If it is a tight interference fit, the bearing should be heated to 90 ~100℃ in the mineral oil. Start installing the bearing immediately after heating. If any difficulty occurs in removal, you are suggested to use removal tool to draw outward while spraying hot oil carefully to the bearing inner ring. The heat will expand the bearing inner ring, which makes it easier to disassemble.?
      2.6. Is less bearing radial clearance better?
      Not all bearings require the smallest working radial clearance. You must choose appropriate clearance according to the application. In the international standard 4604-93, the radial clearance of rolling bearing is divided into five groups, i.e. group 2, group 0, group 3, group 4 and group 5, with the clearance value growing from small to large, among which group 0 is the standard clearance. Standard radial clearance is applicable to general operating conditions, conventional temperature and interference fit; bearings operating under special conditions such as high temperature, high speed, low noise, low friction, etc, should operate with larger radial clearance; bearings for precision spindles, machine tool spindles, etc, should operate with smaller radial clearance. Non-ball bearings may maintain small amount of operating clearance. In addition, split bearings do not need radial clearance. Bearing operating clearance is smaller than the original clearance before installation because there is applied load on the bearings, coupled with elastic deformation incurred by bearing fitting and loading.
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