What are the functions of needle roller bearings?

Needle roller bearings are equipped with thin and long rollers (the length of the roller is 3-10 times the diameter, and the diameter is no more than 5mm), so the radial structure is compact, and its inner diameter and load can be combined with other types of bearings. The smallest diameter, especially suitable for supporting results with limited radial device dimensions. According to different applications, bearings without inner ring or needle roller and cage components can be selected. At this moment, the outer surface of the journal and the outer surface of the housing hole that match the bearing directly serve as the inner and outer roll surface of the bearing, in order to ensure the load capacity and operational performance. Bearings with rings are the same, and the hardness, machining accuracy and appearance quality of the shaft or housing hole raceway should be similar to the raceway of the bearing ring. This type of bearing can only accept radial loads.

In terms of its effect, it should be support, but this is only part of its effect. The essence of support is that it can bear radial loads. It can also be understood as it is used to fix the shaft. It is to fix the shaft so that it can only complete rolling, and control its axial and radial movement.

       For example, the result of a motor without bearings is that it cannot work. Because the shaft may move in any direction, and the motor requires the shaft to only roll.

       Theoretically speaking, it is impossible to complete the transmission effect. Not only that, but the bearing will also affect the transmission. In order to reduce this effect, the bearings of the high-speed shaft must be well smoothed. Some bearings themselves are already smooth, which are called pre-smooth bearings. Most bearings must have lubricating oil, otherwise the conflict will not only increase energy consumption when operating at high speeds, but even more frightening is the simple damage to the bearings.