Structural features of deep groove ball bearings
The raceways of the inner and outer rings of deep groove ball bearings are arc-shaped deep grooves, and the groove radius is slightly larger than the ball radius. It is mainly used to bear radial load, and can also bear certain axial load. When the radial clearance of the bearing increases, it has the function of an angular contact ball bearing, can bear a large axial load, and is suitable for high-speed rotation. The bearing can still work normally when the housing hole and the shaft are relatively inclined by 8'～16', but its service life is affected. This type of bearing can be used to bear pure axial load when the speed is high and thrust ball bearings are not suitable.
Deep groove ball bearings generally use a stamped steel cage composed of two parts, but large-size or high-speed bearings use a solid cage, which is guided by balls like the stamped cage, and the retention of high-speed deep groove ball bearings The carrier is usually guided by the inner or outer ring ribs.
Compared with other types of bearings with the same size, deep groove ball bearings have a small friction coefficient, low vibration and noise, high limit speed and high precision, and are the preferred bearing type for users when selecting models. However, this type of bearing is not resistant to impact and is not suitable for bearing heavy loads.
Deep Groove Ball Bearings Are Simple in Structure and Easy to use. They are the type of bearings with the larget product. IDly used in automobiles, Home Appliances, Machine Tools, Motors, Water Pumps, Agricultual Machinery, Textile machinery and many other fields. Its output accounts for more than 70% of the total output of bearings, and it is the type of bearing with the highest output, the most common use and the cheapest price in my country.
Deep groove ball bearings are the most common type of rolling bearings. The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of cages. There are two types of deep groove ball bearings: single row and double row. Its structure is simple, easy to use, and it is the most commonly produced and widely used type of bearing.
Deep groove ball bearings mainly bear radial loads, and can also bear radial loads and axial loads at the same time. When it is only subjected to radial loads, the contact angle is zero. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can withstand a large axial load. The friction coefficient of the deep groove ball bearing is small, and the limit speed is also high.
The structure of deep groove ball bearing is simple, and it is easy to achieve higher manufacturing precision compared with other types, so it is easy to be mass-produced in series, and the manufacturing cost is also low, so it is widely used. In addition to the basic type, deep groove ball bearings also have various variant structures, such as: deep groove ball bearings with dust cover, deep groove ball bearings with rubber seal rings, deep groove ball bearings with stop grooves, Large load capacity deep groove ball bearing with ball notch, double row deep groove ball bearing
Deep groove ball bearings can be used in gearboxes, instruments, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, engineering machinery, yo-yos, etc.
Deep groove ball bearings are mainly used to support and reduce friction in machinery, so the precision and noise of deep groove ball bearings are directly related to the use and life of machinery. However, business personnel often encounter some customers, even if they use the best deep groove ball bearings or imported deep groove ball bearings, the efficiency is not high, which is related to the use and selection of deep groove ball bearings. Some people may say that the use and selection of deep groove ball bearings is the user's business, and I only care about what the user wants and what I sell.
However, as a qualified salesperson, in addition to being proficient in their own product knowledge, they must also be proficient in the use of products, that is, doctor-type sales, and choose the best supporting deep groove ball bearings according to the performance and use conditions of the user's supporting products. This is the specialized manufacturing and sales popular among major companies in the world at present. This method has also achieved good results since it was implemented by Renben Group.
Because there are many types of deep groove ball bearings and a wide range, the following will mainly analyze the use and selection of the most widely used deep groove ball bearings. It is hoped that those who know little about deep groove ball bearings can deepen their understanding of deep groove ball bearings.
1. Selection of deep groove ball bearings
2. Selection of clearance of deep groove ball bearings: when purchasing deep groove ball bearings, users generally only inform them of the model and grade, and rarely ask for the clearance of deep groove ball bearings. Business personnel must ask the deep groove ball bearings The service conditions of ball bearings, the speed, temperature and fit tolerance of deep groove ball bearings are directly related to the selection of deep groove ball bearing clearance. Generally, motors with a speed below 3500 rpm mostly use CM clearance, such as high-temperature and high-speed motors, require a relatively large clearance. After assembly, the clearance of deep groove ball bearings will be reduced due to the expansion of the inner hole and the shrinkage of the outer circle. The reduction of clearance = interference × 60% (except that the deep groove ball bearing chamber is made of aluminum). For example, the clearance of deep groove ball bearings before assembly is 0.01mm, and the interference during assembly is 0.01mm, then the clearance of deep groove ball bearings after assembly is 0.004mm. In theory, the noise and service life of deep groove ball bearings reach the best state when there is zero clearance. good.
3. Selection of grease: The selection of grease is generally based on the speed, temperature resistance, noise requirements and starting torque of deep groove ball bearings. It requires business personnel to have a good understanding of the performance of various greases.
4. Selection of sealing type of deep groove ball bearings: The lubrication of deep groove ball bearings can be divided into oil lubrication and grease lubrication. Oil lubricated deep groove ball bearings are generally selected form deep groove ball bearings, and grease lubricated deep groove ball bearings are generally sealed with dust covers or rubber seals. The dust cover is suitable for parts with high temperature or good use environment. There are two types of seals: contact seal and non-contact seal. Not as good as contact.
Renben deep groove ball bearings are currently specialized in the manufacture of deep groove ball bearings for automobile motors, deep groove ball bearings for home appliance motors, deep groove ball bearings for motorcycles, and deep groove ball bearings for health care motors. Noise and longevity are at their best.
2. Matters needing attention when using deep groove ball bearings
1. Selection and control of the tolerance of the shaft and deep groove ball bearing chamber: After the deep groove ball bearing is pressed into the deep groove ball bearing, it should rotate flexibly without an
4. Prevention of paint rust: The characteristic of paint rust is that it often occurs in the sealed motor. The motor sounds very good when it is assembled, but after being placed in the warehouse for some time, the abnormal noise of the motor becomes very large. Remove the deep groove The ball bearings are heavily rusted. In the past, many manufacturers would think that it was the problem of deep groove ball bearings. After our continuous publicity, now the motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity, which corrodes the grooves of the deep groove ball bearings and causes damage to the deep groove ball bearings. At present, the problem can only be to choose a good insulating paint and assemble it after drying for a period of time.
The life of deep groove ball bearings is closely related to manufacturing, assembly, and use. It must be done well in every link, so that the deep groove ball bearings can be in the best operating state, thereby prolonging the service life of deep groove ball bearings.y sense of blockage. If there is obvious inflexibility in rotation, it indicates that the size of the shaft is too large and the tolerance should be lowered. If the deep groove ball bearing is pressed into the shaft and there is an obvious rustling feeling when turning it by hand, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of the shaft and the deep groove ball bearing chamber, the roundness must also be well controlled. At present, many domestic manufacturers only control the tolerance, but do not control the roundness.
2. Assembly method of deep groove ball bearings: Because deep groove ball bearings are high-precision products, improper assembly can easily cause damage to the deep groove ball bearing channels, resulting in damage to deep groove ball bearings. Deep groove ball bearings should have special molds during assembly, and they cannot be knocked at will. When pressing into the shaft, only small circles can bear force, and when pressing large circles, only large circles can bear force. Pneumatic or hydraulic pressure is required for assembly, and the upper and lower molds must be outside the horizontal state during press assembly. If there is any inclination, the groove of the deep groove ball bearing will be damaged due to force, and the deep groove ball bearing will produce guiding noise.
3. Prevention of assembly foreign matter: when the deep groove ball bearing is installed on the rotor for dynamic balance, it is easy to enter the iron filings generated during the dynamic balance into the deep groove ball bearing, so it is best to do dynamic balance before installing the deep groove ball bearing . For the convenience of assembly, some manufacturers apply some oil or grease in the deep groove ball bearing chamber to lubricate it during assembly, but it is often difficult for the operator to control the amount. If the oil or grease accumulates in the deep groove ball bearing chamber , It is easy to enter the deep groove ball bearing along the shaft when the deep groove ball bearing rotates. It is best not to apply oil or grease to the deep groove ball bearing chamber. If it must be applied, it must be controlled so that there is no accumulation in the deep groove ball bearing chamber.