Precautions for using SKF Bearing
Precautions for using SKF Bearing
2022年5月12日
Selection of quenching oil for IKO bearing parts
Selection of quenching oil for IKO bearing parts
2022年5月13日

Rolling Koyo bearing with low noise requirements

Koyo bearing with relatively low noise is adopted

  • Among the standard Koyo bearings produced in China, some single row radial ball bearings and short cylindrical roller bearings have low-noise varieties for motor Koyo bearings.
  •  The inner diameter of ball Koyo bearing φ 2.5mm to φ 60mm has several varieties with three suffixes of ZL, Z2 and Z3, which correspond to three different low-noise requirements respectively. Among the roller Koyo bearings, there are eight models from n309 to n322, which are also manufactured according to the low-noise standard
  • These Koyo bearings can be fully applicable to other machines with low noise requirements, and the price is cheap. If the type and size can meet the requirements, try to use these two types of low noise Koyo bearings.Rolling Koyo bearing with low noise requirements
  • When the above two types of low-noise Koyo bearings cannot be used, the Koyo bearing with relatively low noise can be used. The specific comparison basis is as follows:Rolling Koyo bearing with low noise requirements
  • The noise of ball Koyo bearing is lower than that of roller Koyo bearing, and the (friction) noise of Koyo bearing with less sliding is lower than that of Koyo bearing with more sliding;Rolling Koyo bearing with low noise requirements
  • The noise of Koyo bearing with solid cage is relatively lower than that of Koyo bearing with stamping cage; The noise of Koyo bearing with plastic cage is lower than that of Koyo bearing with the above two cages; Those with a large number of balls, thick outer ring and low noise,Rolling Koyo bearing with low noise requirements
  • The noise of high-precision Koyo bearings, especially the Koyo bearings with higher rolling element accuracy, is relatively lower than that of low-precision Koyo bearings,Rolling Koyo bearing with low noise requirements

The noise of small Koyo bearing is relatively lower than that of large Koyo bearing.

  • For example, the noise of centripetal ball bearing is lower than that of short cylindrical roller bearing, and the noise of short cylindrical roller bearing is lower than that of tapered roller bearing. Rolling ina bearings are generally composed of the following four basic elements:
  • Inner ring, outer ring, cage and rolling element – counter centripetal or centripetal thrust bearing (inner ring or outer ring can be collectively referred to as ferrule),
  • Shaft ring, seat ring, cage and rolling element – thrust or thrust centripetal bearing (shaft ring or seat ring can be collectively referred to as washer).
  • Rolling element is the basic structural feature of rolling ina bearing. In order to save space and position, or to install more rolling elements, a few varieties of rolling ina bearings can be without outer ring or inner ring, inner and outer ring, or cage, but all rolling ina bearings must have rolling elements.Rolling Koyo bearing with low noise requirements
  • Usually, the inner ring or shaft ring is installed on the shaft, the outer ring or seat ring is installed in the ina bearing seat hole, and the rolling element is assembled between the inner ring, outer ring or shaft and seat ring. The external load is transmitted from the inner ring or shaft ring to the outer ring or seat ring through the rolling element, or from the outer ring or seat ring to the inner ring or shaft ring. Rolling Koyo bearing with low noise requirements
  • Both sides realize relative rotation through the rolling element. The cage is used to separate the rolling elements to avoid mutual contact between the rolling elements, because the relative speed at the direct contact of the rolling elements is roughly twice that of a single rolling element, which will lead to the scratch of the rolling elements.Rolling Koyo bearing with low noise requirements
  • The advantages and disadvantages of rolling ina bearings are mostly related to the existence of rolling elements. For example, the rolling friction formed by rolling elements has low static and dynamic friction coefficient, high transmission efficiency and small axial size. Rolling Koyo bearing with low noise requirements
  • On the other hand, it also forms high pair contact (point contact or line contact), which makes the stiffness, vibration, noise and other quality of rolling ina bearings inferior to some types of sliding ina bearings, and the radial size is also large. Rolling Koyo bearing with low noise requirements
  • Fag bearing vibration is very sensitive to the damage of fag bearing, such as peeling, indentation, corrosion, crack, wear, etc., which will be reflected in the vibration measurement of fag bearing. Therefore, the vibration can be measured by using a special fag bearing vibration meter (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency division. Rolling Koyo bearing with low noise requirements
  • The measured values are different due to the service conditions of fag bearing or the installation position of sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Rolling Koyo bearing with low noise requirements

 Temperature of Rolling Koyo bearing with low noise requirements

  • Generally, the temperature of fag bearing can be inferred from the temperature outside the fag bearing chamber. It is more appropriate if the temperature of fag bearing outer ring can be directly measured by oil hole.
  • Generally, the temperature of fag bearing starts to rise slowly with the operation of fag bearing, and reaches a stable state after 1-2 hours. The normal temperature of fag bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the fag bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.
  • The thermal sensor can monitor the working temperature of fag bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accident.
  • High temperature often indicates that fag bearing has been in abnormal condition. High temperatures are also harmful to fag bearing lubricants. Sometimes fag bearing overheating can be attributed to the lubricant of fag bearing. Rolling Koyo bearing with low noise requirements
  • If the temperature of fag bearing exceeds 125 ℃ for a long time, the service life of fag bearing will be reduced. The causes of high temperature fag bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, FAG bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.Rolling Koyo bearing with low noise requirements
  • Therefore, it is necessary to continuously monitor the temperature of fag bearing, whether it is measuring fag bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.Rolling Koyo bearing with low noise requirements
  • The regular measurement of fag bearing temperature can be aided by thermometer, such as digital thermometer, which can accurately measure the temperature of fag bearing and display it according to the unit of ℃ or Fahrenheit.Rolling Koyo bearing with low noise requirements
  • Important fag bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind of fag bearing should be equipped with temperature detector.Rolling Koyo bearing with low noise requirements
  • Normally, FAG bearings will have a natural temperature rise after just lubrication or re lubrication and last for one or two days.Rolling Koyo bearing with low noise requirements
Rolling Koyo bearing with low noise requirements

Waviness of components Rolling Koyo bearing

  • Generally speaking, the rolling SKF Bearing itself does not produce noise. The commonly felt “SKF Bearing Noise” is actually the sound effect of SKF Bearing directly or indirectly vibrating with the surrounding structure. This is why many times noise problems can be considered as vibration problems involving the whole SKF Bearing application.Rolling Koyo bearing with low noise requirements
  • Excitation caused by the change of the number of loaded rolling elements
  • When a radial load is loaded on a SKF Bearing, the number of rolling elements bearing the load will change slightly during operation, that is: 2-3-2-3 This causes an offset in the direction of the load. The resulting vibration is inevitable, but can be reduced by axial preloading, which is applied to all rolling elements (not applicable to cylindrical roller bearings).Rolling Koyo bearing with low noise requirements
  • In the case of close fit between SKF Bearing Ring and SKF bearing seat or transmission shaft, SKF Bearing ring may be deformed by matching with the shape of adjacent components. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the SKF Bearing Pedestal and drive shaft to the required tolerances.

Local damage Rolling Koyo bearing 

  • Due to incorrect operation or installation, a small number of SKF bearing raceways and rolling elements may be damaged. During operation, rolling over damaged SKF Bearing components will produce specific vibration frequencies. Vibration frequency analysis can identify damaged SKF Bearing components.
  • Vibration behavior in applications
  • In many applications, SKF bearings have the same stiffness as the surrounding structure. Because of this feature, as long as the SKF Bearing (including preload and clearance) and its configuration in application are correctly selected, it is possible to reduce the vibration in application.
  • – remove critical excitation vibration from the application;
  • – suppress the critical excitation vibration between the excitation part and the resonance part;
  • – change the stiffness of the structure to change the critical frequency.
  • It is becoming more and more serious to check the condition of running machines and prepare a thorough inspection plan SKF Bearing is the focus of attention, because it is an important rotating part in all machines Condition monitoring is an important part of preventive maintenance Early detection of SKF Bearing Damage to avoid equipment shutdown during unscheduled maintenance caused by SKF Bearing damage
  • However, not all of them are equipped with this advanced instrument In this case, the operator or maintenance engineer of the machine must be highly alert to the “fault signal” of SKF Bearing, such as noise, temperature and vibration “Listening”, “touching” and “observing” are three important factors The views provided below can be used as your reference
  • touch
  • High temperature often indicates that SKF Bearing is in abnormal condition High temperatures are also harmful to lubricants in SKF bearings Sometimes SKF Bearing Overheating can be attributed to the lubricant of SKF Bearing If SKF Bearing operates for a long time at a temperature of more than 125 ℃, the service life of SKF Bearing will be reduced The causes of high temperature SKF Bearing include insufficient or excessive lubrication, magazine contained in lubricant, excessive load, SKF Bearing Damage, insufficient clearance, high temperature friction caused by oil seal, etc
  • Therefore, it is necessary to continuously monitor the temperature of SKF Bearing, whether it is measuring SKF Bearing itself or other important parts If the operating conditions remain unchanged, any temperature change may indicate that a fault has occurred
  • The SKF Bearing temperature can be measured regularly with the help of thermometer, which can accurately measure the SKF Bearing Temperature and display it in degrees Celsius
  • Important SKF Bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind of SKF Bearing should be equipped with temperature detector
  • Under normal circumstances, SKF bearings will have a natural temperature rise after just lubrication or re lubrication and last for one or two days

There are three ways to reduce vibration:Rolling Koyo bearing

  • Shaft ring, seat ring, cage and rolling element – thrust or thrust centripetal bearing (shaft ring or seat ring can be collectively referred to as washer).
  • Rolling element is the basic structural feature of rolling ina bearing. In order to save space and position, or to install more rolling elements, a few varieties of rolling ina bearings can be without outer ring or inner ring, inner and outer ring, or cage, but all rolling ina bearings must have rolling elements.
  • Usually, the inner ring or shaft ring is installed on the shaft, the outer ring or seat ring is installed in the ina bearing seat hole, and the rolling element is assembled between the inner ring, outer ring or shaft and seat ring. The external load is transmitted from the inner ring or shaft ring to the outer ring or seat ring through the rolling element, or from the outer ring or seat ring to the inner ring or shaft ring. Both sides realize relative rotation through the rolling element. 
  • The cage is used to separate the rolling elements to avoid mutual contact between the rolling elements, because the relative speed at the direct contact of the rolling elements is roughly twice that of a single rolling element, which will lead to the scratch of the rolling elements.
  • The advantages and disadvantages of rolling ina bearings are mostly related to the existence of rolling elements. For example, the rolling friction formed by rolling elements has low static and dynamic friction coefficient, high transmission efficiency and small axial size. 
  • On the other hand, it also forms high pair contact (point contact or line contact), which makes the stiffness, vibration, noise and other quality of rolling ina bearings inferior to some types of sliding ina bearings, and the radial size is also large. Fag bearing vibration is very sensitive to the damage of fag bearing, such as peeling, indentation, corrosion, crack, wear, etc., 
  • which will be reflected in the vibration measurement of fag bearing. Therefore, the vibration can be measured by using a special fag bearing vibration meter (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency division. The measured values are different due to the service conditions of fag bearing or the installation position of sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
  •   Temperature of fag bearing
  • Generally, the temperature of fag bearing can be inferred from the temperature outside the fag bearing chamber. It is more appropriate if the temperature of fag bearing outer ring can be directly measured by oil hole.
  • Generally, the temperature of fag bearing starts to rise slowly with the operation of fag bearing, and reaches a stable state after 1-2 hours. The normal temperature of fag bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the fag bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.
  • The thermal sensor can monitor the working temperature of fag bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accident.
  • High temperature often indicates that fag bearing has been in abnormal condition. High temperatures are also harmful to fag bearing lubricants. Sometimes fag bearing overheating can be attributed to the lubricant of fag bearing. 
  • If the temperature of fag bearing exceeds 125 ℃ for a long time, the service life of fag bearing will be reduced. The causes of high temperature fag bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, FAG bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.
  • Therefore, it is necessary to continuously monitor the temperature of fag bearing, whether it is measuring fag bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.
  • The regular measurement of fag bearing temperature can be aided by thermometer, such as digital thermometer, which can accurately measure the temperature of fag bearing and display it according to the unit of ℃ or Fahrenheit.
  • Important fag bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind