Check and maintenance points of TIMKEN bearing grease stability

The bearing temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the outer ring of the TIMKEN bearing by using the oil hole. The bearing temperature gradually rises from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, and the like. In the case of high-speed rotation, the selection of the bearing structure and the lubrication method is also the cause.

The rotation of the bearing is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to explain the abnormality. The reasons are poor lubrication, poor accuracy of the shaft or housing, bearing damage, and foreign matter intrusion.

The divergence of the grease in the TIMKEN bearing is a divergence. It must be composed of a relatively straight draft. It should be short-lived. The bearing temperature is low and stable during long-term operation. This is a fantasy. Grease, so the grease is particularly important.

In the popular situation, the grease filling amount in the TIMKEN bearing always exceeds the practical requirement of direct intervention lubrication, saturating the cavity on the frame and the bearing cover, and forming a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment may still be transferred to change the rolling element into the raceway.

In the early stages of bearing operation, most of the grease is squeezed out of the raceway very quickly (less than one minute), and accumulated in the grease retaining body after the bearing migration transition body, and is discharged a small amount. At this time, the bearing temperature will continue to rise until the excess grease is completely discharged. It can be called the grease's running phase. According to the grease quality and filling amount in the bearing structure, this time may last for ten minutes. And even hours.

When grease is added to anti-friction bearings, high pressure theory may not be required unless it is used with great care. High pressure can damage bearings, waste grease, excessive grease can cause high temperatures and create an invisible environment around TIMKEN bearings. In most applications, ball or roller bearings are fully lubricated if the grease level is between one-third and one-half of the bearing capacity. The excess will usually be wasted by the sealed casing.

The anti-friction bearings in all TIMKEN bearings basically contain two hardened steel rings, multiple hardened balls or rollers, and a separate cage or cage for separating the rollers or rollers. These types are divided into two parts in use.

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Ntn ball screw bearing maintenance technical considerations

The high temperature often indicates that the ntn bearing is in an abnormal condition. High temperatures are also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the bearing is rotated for a long time at a temperature exceeding 125 °C, the life of the ball screw bearing will be reduced. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, bearing damage, insufficient clearance, and high friction caused by oil seals.

Ball screw bearings have higher precision than general mechanical parts, so care should be taken when using them.

1. Keep the ntn bearing and its surroundings clean.

2. Careful and careful when using: If you use the carelessness to give the bearing a strong impact, the bearing will be injured, indented, broken and injured.

3. Use the right tools.

4. Pay attention to the rust prevention of the bearing. Avoid use in wet areas, and wear gloves in order not to get sweat on.

5. The user should be familiar with the bearing.

The advantage of lubricating oil lubrication is that it has low frictional resistance and can dissipate heat. It is mainly used for high speed of ball screw bearings and ntn bearings with high working temperature. The grade of the lubricating oil should be selected according to the requirements of the automobile manual, and the vehicle maintenance cycle should be replaced in time. After the old oil is released, the mechanism should be cleaned and then new oil should be added. The fuel should be added to the specified marking line or flush with the filling port. (Depending on the specific structure and requirements of the car), it is not allowed to add more.

The lubrication time interval has a simple premise: to keep the equipment operating properly under conditions where the ball screw bearings do not stop running due to drying and collapse. This is a fixed concept of prevention. However, we must maintain a balance between lubrication and hunger and a lot of over-lubrication.

Traditionally, lubrication plans are based on time. Equipment suppliers typically develop lubrication plans based on operating time. And equipment suppliers often add guidance on the amount of lubricant during their maintenance planning.

Short-term oil changes are very common, and often more grease is added. If the staff is required to change the lubricant every two to three weeks, add one ounce of grease each time. These suggestions started at the outset and they were built on factors that were not known in any practical sense.

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