Three steps to teach you how to install high-quality needle roller shaft

Full complement cylindrical roller bearings are widely used and important mechanical basic parts, which are widely used in various fields of national economy and national defense. Rolling bearings have flourished along with bicycles, automobiles and other industries during the second industrial revolution. In the world, they have gradually become a highly specialized industrial industry. So what is the installation method of it? The following is a detailed introduction: (1) Install the labyrinth ring (waterproof sleeve), the cooperation between the labyrinth ring and the roll neck is generally a tight dynamic fit, and a copper rod needs to be gently tapped in during installation. The two sides of the labyrinth ring must be parallel and fit tightly against the shoulder of the shaft and the inner ring of the bearing. (2) Install the inner ring. The fit between the inner ring of the four-row cylindrical bearing and the roll neck is an interference fit, and the inner ring should be heated to 90-100°C before installation. Do not exceed 120°C to prevent incomplete retraction of the inner ring after cooling. The heating method can be heated by oil tank or induction heating. It is forbidden to heat with open flame. The increase of the inner diameter when heated by the oil tank is calculated according to the following formula: △d＝12.5×10-6△t.d In the formula: △d－－Increase of the inner diameter of the inner ring after heating (mm) △t－－The difference between oil temperature and room temperature Difference (°C), the room temperature standard is 20°C. d——Inner diameter of inner ring (mm) When installing a double inner ring such as FCD type, the inner ring and the inner ring, the inner ring and the end face of the labyrinth ring must be placed against each other in the axial direction during the cooling process of the inner ring, and a feeler gauge must be used. Check it out. (3) The outer ring of the four-row cylindrical roller bearing with the outer ring and the inner hole of the bearing seat are generally transition fit. For smaller bearings, the whole composed of the outer ring, the rollers and the cage can be gently used with a copper rod. Tap into the bearing housing. For larger bearings, use the hoisting holes provided on the outer ring or cage to hoist the outer ring and the outer ring assembly and install it vertically into the bearing housing. For FCDP type four-row cylindrical roller bearings with movable ribs, the side retaining ring, outer ring assembly and middle retaining ring should not be interchanged with the same type of bearing. The marks I, II, III and IV are marked on the end face of the outer ring, which are the symbols of the load zone. When installed and used, the direction of the rolling load should be aligned with the first mark, and the rolling load can be aligned with the remaining marks in turn when cleaning and reloading to prolong the service life of the bearing.

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