Bearing is an important part of contemporary machinery, and its quality is related to the operating condition of the entire equipment. This article introduces the installation, maintenance, disassembly and common problems of bearings. I hope it will be helpful to everyone's production.
Bearing installation
The installation of the bearing directly affects the accuracy, life and performance. Therefore, the design and assembly department must fully study the installation of the bearing and proceed in accordance with the following operating standards:
(1) Clean the bearing and its related parts;
(2) Check the size and finishing of related parts;
(3) Installation (just before opening the bearing package);
(4) Inspection after the bearing is installed;
(5) Supply lubricant.
General grease lubrication, do not clean, directly fill with grease. Lubricating oil is lubricated, and cleaning is not usually necessary. However, the bearings for instruments or high-speed applications should be washed with clean oil to remove the anti-rust agent coated on the bearings. Bearings with anti-rust agent removed are easy to rust, so they should not be left alone. In addition, bearings that have been packed with grease can be used directly without cleaning. The installation method of the bearing varies depending on the bearing structure, fit and other conditions. Generally speaking, because most of the shaft rotates, the inner ring needs an interference fit. Bearings with cylindrical bores are usually pressed in with a press or hot-fitting methods are often used. In the case of a tapered hole, install it directly on the tapered shaft or install it with a sleeve.
Installation of cylindrical bore bearings
The method of pressing in with a press
Small bearings are widely used in press-fitting methods. Pad the spacer block into the inner ring, and press it statically with a press until the inner ring is in close contact with the shoulder of the shaft. Mounting the outer ring with a spacer block to install the inner ring is the cause of indentation and crushing on the raceway, so it is forbidden. During operation, you can apply oil to the mating surface in advance. When installing with a hammer as a last resort, put a block on the inner ring. This method is only limited to the case of 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 interference, use a cushion block to pad, use a screw or oil pressure to press in the inner ring and the outer ring at the same time. The outer ring of self-aligning ball bearing is easy to tilt, even if it is not an interference fit, it should be installed with a pad.
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 housing respectively. When combining the installed inner ring and outer ring, the key is to be stable Ground the two together so that the center of the two does not deviate, and pressing in will cause the raceway surface to jam.
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