In the support portion of the machine, in order to prevent the bearing inner ring and the shaft, the outer ring and the outer ring hole from sliding relative to each other during the operation of the machine, a simple and effective method must be adopted. Especially for the thin-walled ferrules of the ultra-light and ultra-light series bearings, the proper tight fit can make the bearing rings have a uniform force during operation, so that the bearing capacity of the bearing rolling elements can be fully utilized. However, the selected bearing fit cannot be too tight, because the elastic expansion of the inner ring and the contraction of the outer ring will reduce the internal clearance of the bearing until it completely disappears, thus affecting the normal operation of the bearing.
1. Bearing matching
(1) Bearings with cylindrical bores
The main factors that should be considered when choosing a bearing fit are as follows:
1 type of load
According to the load acting on the bearing, the load on the ferrule can be divided into three types: fixed load, swing load and swing load.
Fixed load
The resultant radial load is absorbed by the local area of the ferrule raceway and is correspondingly transmitted to the corresponding local area wind of the shaft or housing mating surface. This load is called a fixed load.
The fixed load is characterized by a synthetic radial load that is relatively stationary with the ferrule. A ferrule that is subjected to a fixed load is generally available with a looser fit.
b. swing load
The resultant radial load vector acting on the bearing ring rotates in the circumferential direction of the raceway, is in turn received by the various parts of the raceway, and is correspondingly transmitted to various parts of the surface of the shaft housing bore. This type of load is called a swing load, also known as a cyclic load.
The slewing load is characterized by a synthetic radial load vector and a relative rotation of the ferrule. Filters or interference fits should be used for the ferrules that bear the slewing load and the shaft or housing bore. If the gap is used for the installation, slippage will occur between them, which will cause the contact surface to wear and friction, and the temperature will rise sharply and the bearing will be damaged quickly. The size of the wanted excess is determined by the operation. When the bearing is working under load, the principle of “crawling” on the mating surface of the shaft or the casing hole is not caused.
C. Swing load
The resultant radial load vector acting on the bearing ring is relatively oscillated in a certain area of the ferrule raceway, is received by a certain area of the raceway, and is transmitted to a certain area of the surface of the shaft or the casing hole, or acts on the bearing The upper load is the impact load and the vibration load, and the load direction or value often changes. This load is called the swing load, and is also called the directional load.
For more information and purchase please visit: https://www.supplyforever.com
