Bearings are one of the most important parts in mechanical equipment. Although the volume is small, but the function is not small at all, so when choosing bearings, whether it is brand or quality, we must be cautious. However, for the general public, the understanding of bearings is limited to appearance, so today's editor of oil-free bearings deliberately share the structure, dimensions and functions of oil-free bearings!
1. Various types of rolling bearings have different characteristics. When choosing a bearing type, you should usually think about the place of application before you can make an accurate judgment. Under normal conditions: thrust bearings and angular touch bearings are used when receiving thrust loads; ball bearings are usually used for high-speed applications; and roller bearings are used when receiving heavy radial loads.
2. The rigidity of the bearing is also an important goal that cannot be ignored. Bearing rigidity refers to the amount of force required for unit deformation of the bearing. The elastic deformation of the tumbling bearing is very small, and it can be ignored in most machines. However, in some machines, such as machine tool spindles, the bearing rigidity is an important factor. Generally, cylindrical and tapered roller bearings should be used. Because these two types of bearings are under load, their rolling bodies and raceways are attributed to point touch, and their rigidity is poor.
3. In mechanical design, usually determine the size of the shaft, and then select the rolling bearing according to the shaft size. Ball bearings are usually used for small shafts and roller bearings are used for large shafts. However, when the bearing is constrained in the diameter direction of the machine, needle roller bearings, extra-light and ultra-light series ball or roller bearings are used to add the flexibility of the bearing; when the bearing is constrained in the axial direction of the machine , Can choose narrow or extra narrow series of ball or roller bearings.
When thinking about the bearing type, it is also necessary to think about whether it is convenient to disassemble the bearing device. Especially for large and extra large bearings, it is particularly important to choose convenient devices and disassembled bearings. Generally speaking, the angular contact ball bearings, tapered roller bearings, cylindrical roller bearings and needle roller bearings with separable outer ring are convenient to disassemble. Since their inner ring and outer ring can be separated from the shaft or shell Inside the body hole. In addition, self-aligning roller bearings, double-row cylindrical roller bearings and self-aligning ball bearings with tapered bores and tapered sleeves on the inner diameter are also relatively easy to disassemble. The specific selection should still be tailored to local conditions.
4 is the consideration of load factors, and also the most important data that needs to be particularly minded when selecting bearings. Roller bearings are used to accept heavier loads, ball bearings are used to accept lighter or medium loads, bearings made of carburized steel or bainite hardened, can accept shock and vibration loads, considered safe and durable, in the industry During the manufacturing process, fully understand the characteristics of the bearing and choose the right small part, which is the most necessary key step.
It can be seen that the unevenness of the bearing quality is related to the running condition of the mechanical equipment. A good bearing can fully exert its effect, make the equipment drive smoothly, improve the work efficiency, and also effectively reduce the conflict between various parts and improve the equipment. Service life. On the contrary, the effect of poor bearings can be very small, and even hinder the transmission of the equipment, causing unnecessary danger.