17*30*9 Thrust ball bearing 51103

Thrust bearings are generally composed of two thrust washers or more thrust washers and several rolling elements. Generally, thrust washers are divided into shaft pieces and seat pieces. The quality cage is combined into a whole. This type of bearing is most commonly a steel ball thrust bearing.

Working principle

Thrust ball bearing is a separate bearing. The shaft ring and seat ring can be separated from the cage and steel ball components. The shaft ring is the ring matched with the shaft, the seat ring is the ring matched with the bearing seat hole, and there is a gap between the shaft; the thrust ball bearing can only bear axial load, and the unidirectional thrust ball bearing can only Axial load in one direction, two-way thrust ball bearings can withstand axial loads in two directions; thrust ball bearings cannot limit the radial displacement of the shaft, the limiting speed is very low, one-way thrust ball bearings can limit one Axial displacement in the direction, bidirectional bearings can limit the axial displacement in both directions. Thrust roller bearings are used to withstand axial and radial combined loads, but the radial load must not exceed 55% of the axial load. Compared with other thrust roller bearings, this type of bearing has a lower friction factor, a higher speed, and self-aligning performance. The rollers of the 29000 type bearing are asymmetrical spherical rollers, which can reduce the relative sliding of the roller and the raceway in operation, and the roller has a long diameter, a large diameter, a large number of rollers, and a high load capacity. Oil lubrication is usually used. , Individual low-speed conditions can be lubricated with grease. When designing and selecting the model, priority should be given to it; 80000 thrust cylindrical roller bearings, 90000 thrust tapered roller bearings and AXK thrust needle roller bearings can withstand unidirectional axial loads, which are more axial than thrust ball bearings The load capacity is much larger, and the rigidity is large and the axial space is small. Thrust cylindrical roller bearings and thrust needle roller bearings are suitable for low speed applications. The thrust tapered roller bearings are slightly faster than thrust cylindrical roller bearings.

Bearing effect

In terms of its function, it should be a support, which is literally used to support the shaft, but this is only a part of its function. The essence of support is to be able to bear radial loads. It can also be understood that it is used to fix the shaft. Bearing quick and easy automatic selection is included. It is to fix the shaft so that it can only rotate, and control its axial and radial movement. The motor can't work at all without bearings. Because the shaft may move in any direction, and the motor requires the shaft to rotate only when it is working. In theory, it is impossible to achieve the role of transmission. Not only that, bearings also affect the transmission. In order to reduce this effect, good lubrication must be achieved on the bearings of high-speed shafts. Some bearings are already lubricated, called prelubricated bearings Most bearings must have lubricating oil, which is responsible for not only increasing energy consumption due to friction during high-speed operation, but more terrible is that it is easy to damage the bearing. The idea of turning sliding friction into rolling friction is one-sided, because there is something called a sliding bearing.

Lubricating

The purpose of lubricating rolling bearings is to reduce internal friction and wear of bearings, prevent burning and sticking; extend their service life; discharge frictional heat and cooling, prevent overheating of bearings, prevent aging of lubricating oils themselves; also prevent external objects from intruding into bearings, or prevent rust and corrosion.

Seal

Bearing seals can be divided into two types: self-contained seals and external seals. The so-called bearing self-sealing means that the bearing itself is made into a device with sealing performance. Such as bearings with dust caps, sealing rings, etc. Such a seal takes up little space, is easy to install and disassemble, and has a relatively low cost. The so-called bearing with sealing performance device is a sealing device with various performances manufactured inside the mounting end cover and the like. Bearing plus seal is divided into non-contact seal and contact seal. Among them, non-contact sealing is suitable for high-speed and high-temperature occasions, and has different structural forms such as gap type, labyrinth type and gasket type. The contact seal is suitable for medium and low speed working conditions. Commonly used felt seals, leather cup seals and other structural forms.