How can I tell if a thin section four-point contact ball bearing needs to be replaced?

What is thin section four point contact ball bearing?

Thin section four point contact ball bearingsare mainly used to withstand radial loads, but when the radial clearance of the bearing is increased, they have a certain degree of angular contact bearing performance and can withstand combined radial and axial loads. When the speed is high and thrust bearings are not suitable, they can also be used to withstand pure axial loads. Compared with other types of bearings of the same size, this type of bearing has a small coefficient of friction and a high limit speed. But it is not resistant to impact and is not suitable for bearing heavy loads.

Features of thin section four-point contact ball bearings

Compact structure: The thin section design of the bearing makes it relatively small in radial size, which can effectively save installation space, especially suitable for equipment with high space requirements, such as aerospace, precision instruments and other fields.

Light weight: Due to the thin section structure, the weight of the bearing is lighter than that of ordinary bearings, which is very beneficial for some application scenarios that need to reduce weight, such as robot joints, high-speed rotating parts, etc., which helps to reduce the overall energy consumption of the equipment and improve the motion performance.

Good performance at high speed: The structure of the four-point contact ball bearing makes the point contact between the steel ball and the raceway, with low friction resistance, combined with the thin-wall design, the moment of inertia is low, so it can run stably at high speed, and is suitable for equipment with high speed requirements such as high-speed motors and centrifuges.

High load carrying capacity: Although it is point contact, with reasonable design and optimization, Thin section four-point contact ball bearings can withstand large radial and axial loads. Especially in the case of bearing pure axial load or large axial load, it shows good load-bearing performance, and can be applied to some mechanical structures that need to bear large axial force.

Good flexibility: This type of bearing can bear both radial and axial loads, and can be flexibly carried in different directions, and has good adaptability to complex stress conditions, and is often used in some mechanical parts that require multi-directional load capacity, such as rotary tables in industrial automation equipment.

Easy installation: The structure of thin section four-point contact ball bearings is relatively simple, and the installation and disassembly are relatively convenient, which can reduce the maintenance cost and downtime of the equipment and improve the efficiency of the equipment.

How can I tell if a thin section four-point contact ball bearing needs to be replaced?

To determine whether thin section four-point contact ball bearings need to be replaced, the following aspects can be considered:

Visual inspection

Surface wear: Observe the surface of the inner ring, outer ring, rolling elements and cage of the bearing. Visible wear marks, scratches, spallings, pitting or pits on the raceway surface can affect the accuracy and performance of the bearing and may need to be replaced.

Deformation and cracks: Check whether there are deformations or cracks in each part of the bearing. Deformation of the inner and outer rings can lead to a decrease in fitting accuracy, and cracks can cause sudden failure of the bearing, which are important indicators that need to be replaced.

Grease Condition: Look at the color, texture and amount of grease inside the bearing. If the grease is badly discolored, the texture becomes viscous or thin, a large number of impurities are mixed, or it is obviously missing, it may affect the normal operation of the bearing, and the bearing needs to be further inspected for damage and replaced if necessary.

Operational status monitoring

Abnormal temperature: The temperature of the bearing in operation is generally stable within a certain range. If the bearing temperature rises suddenly, exceeding the normal operating temperature (e.g., exceeding 80°C), and other factors (such as insufficient lubrication, excessive load, etc.) have been ruled out, it may be that there is a fault inside the bearing, such as rolling element wear, raceway damage, etc., and replacement needs to be considered.

Vibration and noise: Vibration monitoring equipment is used to measure the vibration of the bearing, if the vibration amplitude is significantly increased, or if there is an abnormal vibration frequency, there may be a problem with the bearing. In addition, abnormal noises, such as sharp friction sounds, impact sounds or uneven running sounds, often indicate that there is a component inside the bearing that needs to be inspected in detail and replaced as appropriate.

Performance testing

Clearance measurement: Use professional clearance measurement tools, such as feeler gauges, clearance gauges, etc., to measure the radial clearance and axial clearance of bearings. If the clearance is outside the specified range, too large or too small will affect the performance and life of the bearing, and may need to be replaced.

Rotation accuracy detection: check the rotation accuracy of the bearing, such as the radial runout of the shaft and the axial channeling momentum. If these accuracy indicators are beyond the required range of the equipment, it may be caused by wear or damage to the bearing, and it is necessary to consider replacing the bearing to restore the accuracy of the equipment.

Running hours and working environment

Running time: refer to the service life of the bearing or the manufacturer's recommended service life, combined with the actual running time to judge. In general, bearings that are at or near the end of their service life, even if there are no obvious signs of failure at the moment, should be considered for preventive replacement to avoid sudden failures that could lead to equipment downtime.

Working environment: If the bearing works in a harsh environment, such as high humidity, high dust, strong corrosion and other environments, or long-term heavy load, frequent start and stop and other working conditions, it will accelerate the wear and aging of the bearing. Even if the operating time does not reach the usual service life, the bearing condition needs to be checked more frequently and replaced in advance according to the actual situation.

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