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Under normal circumstances, INA bearings can only be used in conjunction with shafts and housings. Do you know how to use the INA bearing interference fit assembly? Someone will ask: "Isn't the interference fit assembly means putting the shaft or sleeve parts into the hole? Does the size of the shaft or sleeve and the hole fit slightly larger than the hole?" Can the INA bearing still operate well? ? Below, Eric Bearing Limited will answer your doubts based on the understanding.
1. Why INA bearings adopt interference fit assembly
When the load on the INA bearing rotates relative to the ring, that is, when the direction of the radial load does not change, but the ring rotates; or the ring is stationary but the load rotates around the ring, the mating surface bears The load position will undergo contact deformation, and at the same time, there will be a gap at the opposite position. As a result, the circumferences of the inner part of the mating surface and the outer part will be inconsistent, and the inner part will slip in the inner diameter surface of the outer part. This slippage is slow and is generally called creep. After creep occurs, due to poor lubrication of the mating surface, coupled with the ploughing effect of abrasive particles, the mating surface will be severely worn, resulting in poor rotation of the bearing, heat generation or internal wear of the bearing, and ultimately damage to the bearing. In order to prevent this phenomenon, it is necessary to adopt an interference fit so that there is no gap between the mating surfaces. In addition, when the ferrule needs to be positioned strictly, an interference fit is also required.
2. Advantages of interference fit
(1) The connection is firm, and the degree of tightening can exceed that of key connection and pin connection.
(2) The interference connection reduces the number of parts and simplifies the mechanical structure.
Due to the above advantages, the interference fit is suitable for connections that bear impact loads and are not frequently disassembled.
3. It can be seen that the reliability of interference fit is related to the assembly method. The following example illustrates the assembly method of INA bearing interference fit:
(1) For small interference, it is a light interference fit.
Assemble with steel hammer or press. It is used for precise positioning, overhaul before disassembly or no disassembly. Due to the small interference, most of the above fits cannot transmit load by the generated tightening force. If torque or axial force needs to be transmitted, fasteners must be added.
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