Installation and maintenance of bearings

Whether the bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of the bearing. It is expected to be installed in accordance with operating standards. The items of the operating standard are usually as follows:
(1) Cleaning bearings and bearing related parts
(2) Check the size and finishing of related parts
(3) Installation
(4) Inspection after bearing installation
(5) Supply of lubricant
It is hoped that the bearing package will be unpacked just before installation. Generally lubricated with grease, without cleaning, directly filled with grease. Lubricating oil, usually do not need to be cleaned, but the instrument or high-speed bearings, etc., should be cleaned with clean oil to remove the rust inhibitor coated on the bearings. Bearings with rust inhibitors removed are susceptible to rust and should not be left alone. In addition, greased bearings are used without cleaning.
The installation method of the bearing varies depending on the bearing structure, fit and conditions. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings are often pressed in with a press or hot-loaded. In the case of a tapered hole, install it directly on the taper shaft or use a sleeve.
When mounted to the shell, there is usually a large amount of clearance fit, and the outer ring has an interference amount. It is usually pressed in with a press, or there is a cold shrink fit method for installation after cooling. When dry ice is used as the coolant, when the shrink fit is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.
maintenance
Disassembly
The disassembly of the bearing is carried out regularly, and it is carried out when the bearing is replaced. After disassembly, if you continue to use it, or if you need to check the condition of the bearing, the disassembly must be carried out as carefully as during installation. Pay attention not to damage the various parts of the bearing, especially the disassembly of the interference fit bearing, which is difficult to operate.
It is also important to design and make disassembly tools as needed. When disassembling, study the disassembly method, sequence, and investigate the matching conditions of the bearings according to the drawings to find the foolproof operation.
的 Disassembly of the outer ring with interference fit. Set several outer ring extrusion screws for the screw on the circumference of the casing in advance. Tighten the screw evenly while disassembling it. These screw holes are usually covered with separate bearings such as blind plugs, tapered roller bearings, etc. Several cutouts are set in the housing blocking shoulder, and they are disassembled with a press using a pad or lightly tapped.
The inner ring can be disassembled easily using a press. At this time, pay attention to the inner ring to withstand its pulling force. Moreover, the pull-out clamps shown are also mostly used, no matter which kind of clamps, they must be firmly clamped to the side of the inner ring. For this reason, it is necessary to consider the size of the shaft shoulder, or to study the groove on the shoulder so as to use a drawing clamp.
 The inner ring of large bearings is disassembled by hydraulic method. Oil pressure is provided through the oil hole provided in the bearing to make it easy to pull. For bearings with large widths, the hydraulic method is used in combination with the pull-out clamp for disassembly.
 The inner ring of cylindrical roller bearings can be disassembled by induction heating method. A method of heating the local part in a short time to expand the inner ring and then drawing. Where a large number of bearing inner rings need to be installed, induction heating is also used.

Engine component tensioner