The importance of lubricating oil in TIMKEN joint bearings

In order to ensure the normal operation of the TIMKEN joint bearing, it must have good lubrication. The rated load and the limit speed of the rolling bearing are determined under the assumption that the lubrication is proper. The so-called proper lubrication means that the lubricant is properly selected, the amount of lubricant is appropriate, and the lubrication is appropriate. Badness is often one of the main causes of early damage to bearings. According to statistics, about 1/3 of the bearings are damaged due to poor lubrication.

When the TIMKEN joint bearing rotates, the bearing wears and fails due to frictional resistance. The resistance to the rotation of the rolling bearing is composed of rolling friction, sliding friction and lubricant friction. Rolling friction occurs when the rolling elements roll on the bearing raceway; sliding friction occurs on the guiding surface of the rolling body in the cage, the rib guiding surface of the cage, and the roller end face and the ferrule rib in the roller bearing; lubrication The friction of the agent consists of the internal friction of the lubricant at the contact and the agitation and extrusion of the lubricant. Therefore, the resistance of the impedance TIMKEN joint bearing movement is the sum of the above three frictions. The purpose of lubrication is to avoid the direct contact between the raceway, the rolling element and the cage metal through the grease and its lubrication method, reduce the friction heat, minimize the frictional resistance, thereby reducing the wear, preventing the corrosion and prolonging its use. life.

About 80% of TIMKEN joint bearings are lubricated with grease. There are many types of bearings that are sent to the user after being greased in the bearing factory. Therefore, some people refer to grease as the fifth largest part of the bearing's inner ring, outer ring, rolling element, and cage. Explain the importance of grease to bearings.

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Vibration and temperature of NTN thrust ball bearings to determine bearing damage

First, the vibration of the bearing

NTN thrust ball bearing vibration is very sensitive to bearing damage. For example, peeling, indentation, rust, crack, wear, etc. are reflected in the bearing vibration measurement. Therefore, by using a special bearing vibration measuring device (frequency analyzer, etc.) The magnitude of the vibration is measured, and the specific situation of the abnormality cannot be inferred by the frequency division. The measured value differs depending on the use conditions of the NTN thrust ball bearing or the sensor mounting position. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.

Second, the temperature of the bearing

The temperature of the NTN thrust ball bearing is generally estimated by the temperature outside the bearing. If the oil hole can directly measure the outer ring temperature of the NTN thrust ball bearing, it is more suitable.

Usually, the temperature of the NTN thrust ball bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of NTN thrust ball bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.

The thermal sensor can be used to monitor the working temperature of the NTN thrust ball bearing at any time, and automatically alarm or stop the occurrence of the burning shaft accident when the temperature exceeds the specified value.

Frequent use of high temperatures indicates that an abnormal condition has occurred. High temperatures are also detrimental to the lubricants of NTN thrust ball bearings. Sometimes bearing overheating can be attributed to the lubricant of the bearing. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce bearing life. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, NTN thrust ball bearing damage ring, insufficient clearance, and high friction caused by oil seal.

Therefore, it is necessary to continuously monitor the temperature of the NTN thrust ball bearing, whether it is measuring the bearing itself or other important parts. If the operating conditions are the same, any temperature change can indicate that a fault has occurred.

The periodic measurement of the NTN thrust ball bearing temperature can be accurately measured by means of a thermometer, such as a digital thermometer, and displayed in °C or Fahrenheit.

The importance of NTN thrust ball bearings means that when it is damaged, it will cause equipment to stop. Therefore, it is better to install temperature detectors for such bearings.

Under normal conditions, NTN thrust ball bearings will naturally rise in temperature after lubrication or relubrication for one to two days.

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