Bearing installation, maintenance, disassembly and control of these points, the service life is increased by three times!

Bearing installation, maintenance, disassembly and control of these points, the service life is increased by three times! The installation of the bearing directly affects the accuracy, life and performance. Therefore, the design and assembly part should fully study the installation of the bearing, and proceed according to the following operating specifications: (1) Clean the bearing and bearing related parts; (2) Check the related parts (3) Installation (just open the bearing package just before installation); (4) Inspection after the bearing is installed; (5) Provide lubricant. Ordinary grease lubrication, no cleaning, direct filling with grease. Lubricating oil does not need to be cleaned in general. However, bearings for instruments or high-speed use should be washed with clean oil to remove the rust inhibitor coated on the bearings. Bearings with rust inhibitor removed are easy to rust, so they should not be left unattended. Furthermore, bearings that have been sealed with grease can be used directly without cleaning. The installation method of the bearing varies depending on the bearing layout, coordination and other conditions. Generally speaking, since most of the shafts are twisted, the inner ring needs an interference fit. Cylindrical bore bearings are usually pressed in by a press, or by a shrink-fit method. For tapered holes, install it directly on the tapered shaft, or install it with a sleeve. The installation of cylindrical bore bearings is carried out by press-fitting. Small bearings are widely used in the press-fitting method. Put the spacer into the inner ring, and use a press to press the inner ring quietly until it is in close contact with the shaft shoulder. Putting the pad on the outer ring and installing the inner ring is the cause of indentation and crushing on the raceway, so it is not allowed. When operating, oil can be applied to the mating surface in advance. As a last resort, use a hammer to hit the installation site, and place a pad on the inner ring. This method is limited to the environment with small interference, and cannot be used for large interference, or medium and large bearings. For non-separable bearings such as deep groove ball bearings, where the inner ring and outer ring need to be installed with an interference amount, use a spacer pad, and use a screw or oil pressure to press the inner and outer rings at the same time. The outer ring of the self-aligning ball bearing is easy to be skewed, even if it is not an interference fit, it should be installed with a spacer. For separable bearings such as cylindrical roller bearings and tapered roller bearings, the inner ring and outer ring can be installed on the shaft and the outer casing respectively. When the separately installed inner and outer rings are connected, the link is stable and stable. Close the two so that the center of the two does not deviate, and the forced pressing in will cause the raceway surface to be stuck. (2) The method of shrinking large bearings requires a very large force when pressing in, so it is very difficult to press in. Therefore, the shrink-fit method of heating the bearing in oil to stretch it and then fitting it to the shaft is widely used. Using this method, the operation can be realized in a short time without adding improper force to the bearing. The heating temperature of the bearing is based on the bearing size and the required interference. The precautions related to the hot camouflage industry are as follows: (a) Do not heat the bearing above 120°C; (b) In order to prevent the bearing from directly touching the bottom of the oil tank, consider placing the bearing on a metal mesh table, or hoisting the bearing; ( c) Heat the bearing to 20°C-30°C higher than the required temperature, so that the inner ring will not become cold during operation, making it difficult to install; (d) After installation, the bearing cools down and shrinks in the width direction, so use the shaft Nuts, or other suitable methods, are tightened to prevent cracks between the inner ring and the bearing shoulder.

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