Four major causes of vibration damage of IKO imported bearing
Four major causes of vibration damage of IKO imported bearing
2022-05-22
Maintenance technology of bearing under working condition
Maintenance technology of bearing under working condition
2022-05-24

Function of deep groove ball bearing

The inner and outer race raceways groove ball bearing

 
  • The inner and outer race raceways of arc-shaped deep grooves, and the groove radius is slightly larger than the ball radius. It is mainly used to bear radial load and certain axial load. When the radial clearance of the bearing increases, it has the function of angular contact ball bearing, can bear large axial load, and is suitable for high-speed rotation.
  •  The bearing can still work normally when the shell hole and shaft are relatively inclined by 8 ′~ 16 , but its service life is affected. When the rotating speed is high and thrust ball bearing is not suitable, this kind of bearing can be used to bear pure axial load.
  • Deep groove ball bearings generally use a steel plate stamping cage composed of two parts, but large-size or high-speed bearings use a solid cage. This cage is made of balls like the stamping cage. The cage of high-speed deep groove ball bearings is usually blocked by the inner ring or outer ring.
  • Compared with other types of bearings with the same size, deep groove ball bearing has small friction coefficient, low vibration and noise, high limit speed and high precision. It is the preferred bearing type for users. 하지만, such bearings are not resistant to impact and are not suitable for bearing heavy loads.
  • Deep groove ball bearing has the advantages of simple structure and convenient use. It is a kind of bearing with large production volume and wide application range. It is widely used in automobiles, household appliances, 공작 기계, motors, water pumps, agricultural machinery, textile machinery and many other fields. Its output accounts for more than 70% of the total output of bearings. It is a kind of bearing with high output, universal use and low price in China.
  • Deep groove ball bearing is a common type of rolling bearing. The basic deep groove ball bearing is composed of an outer ring, 내부 링, a group of steel balls and a group of retaining structures. single row and double row.
  • The type code of single row deep groove ball bearing is 6 and the code of double row deep groove ball bearing is The utility model has the advantages of simple structure and convenient use. It is a kind of bearing with universal production and wide application.
  • Deep groove ball bearings mainly bear radial load, and can also bear radial load and axial load at the same time. When it only bears radial load, the contact angle is zero. When the large radial clearance, it has the performance of angular contact bearing and can bear large axial load. The friction coefficient is very small and the limit speed is also very high.
  • Has simple structure and is easy to achieve high manufacturing accuracy compared with other types, so it is convenient for series mass production, low manufacturing cost and widespread use. In addition to the basic type, the also has various variant structures, such as: deep groove ball bearing with dust cover, deep groove ball bearing with rubber seal ring.
  • Deep groove ball bearings can be used in gearboxes, instruments, motors, household appliances, internal combustion engines, traffic vehicles, agricultural machinery, construction machinery, engineering machinery, yo yo, 등
  • Deep groove ball bearing mainly plays the role of supporting and reducing friction in machinery, so the accuracy and noise of deep groove ball bearing are directly related to the service life of machinery. 하지만, business personnel often encounter some customers, 그건, the efficiency of or imported deep groove ball bearings is not high, which is related to the use and selection.
  • Some people may say that the use and selection of the business of users. I only care what users want and what I sell. 하지만, as a qualified salesperson, in addition to being proficient in their own product knowledge, they should also be proficient in the use of products, 그건, doctor type sales, and the matching deep groove ball bearings selected according to the performance and service conditions of userssupporting products.
  • This is the professional manufacturing and sales popular among major companies in the world. This method has also achieved good results since its implementation in renben group.
  • Because there are many types and a wide range of deep groove ball bearings, the following will mainly analyze the use and selection a wide range of applications. It is hoped that those who know less about can deepen their understanding of deep groove ball bearings.
  • Selection and control of tolerance of shaft and chamber: the deep groove ball bearing shall rotate flexibly without blocking feeling after being pressed into the deep groove ball bearing. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced.
  •  If the deep groove ball bearing has obvious sand feeling when rotating by hand after being pressed into the shaft, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. 그러므로, when controlling the tolerance of shaft and chamber, it is also necessary to control the roundness. At present, many domestic manufacturers only control the tolerance, not the roundness.
  • Assembly method of deep groove ball bearing: because deep groove ball bearing is a high-precision product, if it is not assembled properly, it is easy to damage and cause damage to . The shall be equipped with a special mold during assembly, and can not be knocked at will.
  •  When pressing the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed. Pneumatic or hydraulic pressure is required during assembly. During press assembly, the upper and lower molds shall be outside the horizontal state. If there is inclination, the will be damaged due to stress.
  • Prevention of assembly foreign matters: when the is installed on the rotor for dynamic balance, it is easy to put the iron filings generated during dynamic balance into the deep groove ball bearing, so it is necessary to perform dynamic balance .
  •  In order to facilitate assembly, some manufacturers apply some oil or grease in the deep groove ball bearing chamber for lubrication effect during assembly, but it is often difficult for the operator to control the amount.
  •  If more oil or grease is accumulated 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. The deep groove ball bearing chamber shall not be coated with oil or grease. If it must be coated, it shall be controlled, and there shall be no accumulation.
  • Prevention of paint rust: paint rust is often found in sealed motors. The sound of the motor is very good during assembly, but after being placed in the warehouse for some time, the abnormal sound of the motor becomes very large, and there is serious rust when.
  • 과거에, many manufacturers thought 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 channel of the deep groove ball bearing and leads to the damage of the deep groove ball bearing. At present, the problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time.
  • The service life of deep groove ball bearing is closely related to manufacturing, assembly and use. It must be done well in each link in order to make the deep groove ball bearing in the running state, so as to prolong the service life of deep groove ball bearing. 일반적으로, the installation space of double row cylindrical roller bearings is limited. In most cases, the shaft diameter (or bearing inner diameter) is limited by mechanical design or other design.
  • 그러므로, the selection of bearing type and size is determined according to the inner diameter of the bearing. 그러므로, the main dimension tables of standard bearings are compiled according to the international standard inner diameter dimensions.
  • Standard double row cylindrical roller bearings have various sizes and forms, In the design of mechanical devices, standard bearings are used (considering whether the bearings are easy to purchase, as an aside, some models in the bearing catalogue do exist, but some non-standard bearings are not available in stock in Chinese Mainland. Sometimes the futures will take a long time, so the time cost and later replacement cost should be considered in the bearing selection). 
  • The load imposed on the bearings is the load of double row cylindrical roller bearings, Its nature, size and direction are changeable. 일반적으로, the rated base load is shown on the dimension table. 하지만, axial load and radial load are also important factors in selecting suitable bearings. When the ball and needle roller bearings have the same size, double row cylindrical roller bearings usually have high load capacity and bear large vibration and impact loads.
Function of deep groove ball bearing

Second, groove ball bearing

  • The allowable speed is determined according to the type, 크기, accuracy, cage type, load, 윤활 모드, cooling mode and other factors of double row cylindrical roller bearing. The bearing table lists the allowable speed of standard precision bearings under oil lubrication and grease lubrication. 일반적으로, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation.
  • Third, bearing tolerance.
  • The dimensional accuracy and rotation accuracy of double row cylindrical roller bearings are based on ISO and JIS standards. For machines requiring high precision and high-speed operation, it is recommended to use bearings with precision of grade 5 or above.
  • 깊은 홈 볼 베어링, centripetal thrust ball bearings or cylindrical roller bearings are suitable for machines with high operation precision. Rigidity, when the contact surface of the rolling element and raceway of the bearing is compressed, it will produce elastic deformation. The elasticity needs to be reduced to some mechanical deformation. Roller bearings produce less elastic deformation than ball bearings. The use factors of bearings mainly refer to whether the installation, adjustment, use and maintenance, maintenance and repair meet the technical requirements.
  • According to the technical requirements of ina bearing installation, use, maintenance and repair, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of INA Bearing in operation. 이상이 발견된 경우, immediately find out the cause and adjust it to make it return to normal. The installation condition is one of the primary factors in the use factors.
  • The improper installation of the bearing often leads to the change of the stress state between the parts of the whole bearing. The bearing operates in an abnormal state and ends its service life early. The internal factors mainly refer to the three factors that determine the bearing quality, 구조 설계와 같은, 제조 공정 및 재료 품질.
  • Selection of bearing clearance: when purchasing bearings, users generally only tell what model and grade they are in, and rarely put forward requirements for bearing clearance. Business personnel must ask about the service conditions of ina bearings, in which the speed, temperature and fit tolerance of ina bearings are directly related to the selection of bearing clearance.
  • 예를 들어, motors with relatively large clearance at high speed below 3500 cm are generally used. After assembly, the bearing clearance will be reduced due to the increase of inner hole and the reduction of outer circle. The reduction of clearance = interference × 60% (unless the bearing housing is aluminum).
  • 예를 들어, if the clearance before bearing assembly is 0.01mm and the interference during assembly is 0.01mm, the clearance after bearing assembly is 0.004mm. Theoretically, the noise and service life of the bearing reach the state of zero clearance, but considering the temperature rise and other problems in actual operation, the clearance of the bearing after assembly is 0.002mm-0.004mm.
  • Selection of grease: the selection of grease is generally based on the speed, temperature resistance, noise requirements and starting torque of INA Bearing, and the business personnel are required to understand the performance of various grease.
  • Selection of bearing model: the bearing model is generally selected by the user’s technicians according to the service conditions and load of supporting products. The business personnel mainly know whether the actual load of the user is consistent with the selected bearing. If the cylindrical roller bearing can not meet the use requirements, they should advise the customer to change the model as soon as possible, but there will be no problem in selecting the model unless special products.
  • Selection of bearing sealing type: Lubrication of ina bearing can be divided into oil lubrication and grease lubrication. Oil lubricated bearings are generally formal bearings, and grease lubricated ina bearings are generally sealed with dust covers or rubber seals.
  • The dust cover is suitable for parts with high temperature or good service environment. The seals are divided into contact seal and non-contact seal. The contact seal has good dust-proof performance but large starting torque, and the non-contact seal has small starting torque, but the sealing performance is not as good as the contact seal.
  • Disassembly of bearing: INA Bearing is installed at the root of steering knuckle shaft, which is difficult to remove, mainly because it is not easy to operate. Special puller can be used, which can be removed easily. Put the two half conical inner circular pull sleeves of the puller on the inner bearing, tighten the fastening bolts, and then use the pull sleeve ring to cover the pull sleeve so that it cannot be opened, then rotate the handle to make the top of the screw in the central hole at the end of the steering knuckle, and continue to rotate the handle clockwise to pull out the inner bearing.
  • Disassemble with the old leaf spring: cut two holes slightly larger than the diameter of the tire nut with oxygen according to the center distance of the tire nut on the old leaf spring with appropriate length, turn the concave surface of the leaf spring outward
  • screw in the nut at the front end of the steering knuckle and flush with the end to protect the steering knuckle thread, fill the cushion block with appropriate thickness between the leaf spring and the steering knuckle, tighten the two tire nuts pressed on the leaf spring at the same time, and make use of the elasticity of the leaf spring, The less tight rolling mill bearing can be pulled outward. If the bearing cannot be removed, it can be hammered several times in the middle of the leaf spring to produce vibration force, and then screw the nut.

Selection of deep groove ball bearing

  •  Selection of clearance of deep groove ball bearing: when purchasing deep groove ball bearing, users generally only tell what model and grade, and rarely put forward requirements for the clearance of deep groove ball bearing. Business personnel must ask about the service conditions of deep groove ball bearing, in which the speed, temperature and fit tolerance of deep groove ball bearing are directly related to the selection of clearance.
  •  예를 들어, motors with relatively large clearance at high speed below 3500 cm are generally used. After assembly, the clearance of deep groove ball bearing will be reduced due to the increase of inner hole and the reduction of outer circle. The reduction of clearance = interference × 60% (except that the deep groove ball bearing chamber is made of aluminum). 
  • 예를 들어, if the clearance of deep groove ball bearing before assembly is 0.01mm and the interference during assembly is 0.01mm, the clearance of deep groove ball bearing after assembly is 0.004mm. Theoretically, the noise and service life of deep groove ball bearing reach the state of zero clearance, but considering the problems of temperature rise in actual operation, the clearance after assembly is 0.002mm-0.004mm.
  • Selection of grease: the selection of grease is generally based on the speed, temperature resistance, noise requirements and starting torque. Business personnel are required to know the performance of various greases.
  • Selection of sealing type of deep groove ball bearing: the lubrication of deep groove ball bearing can be divided into oil lubrication and grease lubrication. Oil lubricated deep groove ball bearings are generally in the form of deep groove ball bearings, and grease lubricated generally sealed with dust covers or rubber seals.
  • The dust cover is suitable for parts with high temperature or good service environment. The seals are divided into contact seal and non-contact seal. The contact seal has good dust-proof performance but large starting torque, and the non-contact seal has small starting torque, but the sealing performance is not as good as the contact seal.
  • At present, humanistic deep groove ball bearings have been professionally manufactured in automobile motor deep groove ball bearings, household appliance motor deep groove ball bearings, motorcycle deep groove ball bearings, health care motor and other industries, so that the noise and service life of deep groove ball bearings can reach the state.
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