Cylindrical roller bearings are precision bearings. The rib guide of the precision-sorted roller shaft ring is composed of a cage, a roller and a guide shaft ring. It can be separated from another bearing ring and is a separable bearing. This kind of bearing is relatively convenient to install and disassemble, especially when the inner and outer rings are required to have an interference fit with the shaft and housing. This type of bearing and raceway are line contact bearings. The load capacity is large, and it is mainly subjected to radial load. Only single-row bearings with ribs on both the inner and outer rings can withstand small steady axial loads or large intermittent axial loads; compared with other bearings with similar dimensions, this kind of bearing has high load, bottom noise It has the characteristics of high speed and high speed, and the conflict between the rotating body and the rib of the ferrule is small, which is suitable for high-speed torsion. It is very suitable for all kinds of precision machines and mine mill machines. However, the shafts, rotating bodies and other related parts that cooperate with such bearings need to be precisely machined. According to whether the ring has ribs or not, it can be divided into single row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double row full complement cylindrical roller bearings such as NNU and NN. The bearing has a separable layout of the inner ring and the outer ring. Cylindrical roller bearings without ribs on the inner or outer ring, the inner and outer rings can move relative to the axial direction, so they can be used as free end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring and outer ring and a single rib on the other side of the ring can withstand a certain degree of axial load in one direction. Commonly used steel stamping cage, or copper alloy car-made solid cage. However, there is also a use of polyamide forming cages. Needle roller bearings are roller bearings with cylindrical rollers that are thin and long relative to their diameter. Such rollers are called needle rollers. Even with a smaller cross-section, the bearing still has a high load bearing capacity. The needle roller bearing is equipped with thin and long rollers, so the radial layout is compact, and its inner diameter size and load capacity are similar to other types of bearings, especially suitable. For bearing arrangements with limited radial installation dimensions. Therefore, needle roller bearings are mainly used in places with limited space, so they are widely used in automobiles, motorcycles, and textile machines. And the inner ring of the needle roller is optional. To put it bluntly, if the hardness and roughness of the shaft meet the requirements, the inner ring can be omitted. However, if the processing degree of the shaft is relatively low, it is probably relatively soft, and the inner ring is required. The circle acts as a raceway. The differences between cylindrical roller bearings and needle roller bearings are as follows: 1. The rotating body of a full complement cylindrical roller bearing is a tapered roller; the rotating body of a needle roller bearing is a needle roller; 2. The rotating body of a full complement cylindrical roller bearing is a The layout is larger than that of needle roller bearings; 3. Cylindrical rollers can withstand axial forces in addition to radial forces, while needle roller bearings can only withstand radial forces; 4. Cylindrical roller bearings are divided into single-row and double-row 5. The working speed of cylindrical roller bearings is higher than that of needle roller bearings; 6. Cylindrical roller bearings are generally made of high-quality bearing steel and special steel; Wall needle roller bearings are stamped from steel plates. In machine planning, the size of the shaft is usually determined first, and then the rotating bearing is selected according to the size of the shaft. However, when the bearing is limited in the diameter direction of the machine, needle roller bearings, extra light and ultra light series ball or roller bearings are used; when the bearing is limited in the axial position of the machine, narrow or special Narrow series of ball or roller bearings. Radial needle roller and cage assemblies, drawn cup needle roller bearings, solid ferrule needle roller bearings, and thrust needle roller bearings are widely used in automotive-related news and variable-speed transmission systems of construction machines, steering systems, motorcycle engine connecting rods, etc. It is suitable for places with small space and large carrying capacity. Needle roller bearings are equipped with thin and long rollers, so the radial structure is compact. When their inner diameter size and load capacity are similar to other types of bearings, the outer diameter is very small, especially suitable for the support effect with limited radial installation size.
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