Installation and maintenance methods of thin section four-point contact ball bearings

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.

Installation and maintenance methods of thin section four-point contact ball bearings

The installation and maintenance methods of thin section four-point contact ball bearings are as follows:

Installation method:

Preparation before installation

Check the bearing: check whether the model and size of the bearing are consistent with the installation part, and whether there are defects such as damage and rust in the appearance.

Clean parts: Thoroughly clean the bearings and the shafts, housing holes and other parts that match them, remove impurities such as oil, iron filings, dust, etc., and wipe them dry with a clean cloth.

Measuring dimensions: Use a gage to measure the dimensions of the shaft and housing bore to ensure that they meet the tolerance requirements for bearing mounting.

Installation process

Mounting the bearing inner ring: The bearing inner ring is usually mounted to the shaft by hot loading or cold pressing. When hot charging, the inner ring of the bearing can be heated to an appropriate temperature (generally not more than 120°C) in hot oil, and then quickly inserted into the shaft; The cold pressing method is to use a press to press the inner ring evenly into the shaft, taking care that the pressure should be applied to the inner ring of the bearing to avoid direct knocking on the bearing.

Installing the outer ring of the bearing: Install the outer ring of the bearing into the housing hole, which can be installed by a similar cold pressing method or by using a special installation tool to ensure that the outer ring fits tightly with the housing hole and is installed in place.

Installing the cage and steel balls: For split thin section four-point contact ball bearings, the cage and steel balls need to be properly installed into the bearings after the inner and outer rings are installed. When installing, pay attention to the direction of the cage and the number and position of the steel balls to ensure that they are evenly distributed.

Install the sealing device: according to the use requirements, install the corresponding sealing device, such as sealing ring, sealing gasket, etc., to prevent lubricating oil leakage and external impurities from entering the bearing.

Maintenance Methods

Lubrication management

Choose the right lubricant: Choose the right lubricant according to the working conditions of the bearing (such as speed, load, temperature, etc.), generally lubricating oil and grease. For high-speed and high-temperature working conditions, lubricating oil with low viscosity is usually selected; For low-speed, heavy-duty applications, higher viscosity oils or greases are available.

Replenish and replace lubricant regularly: Regularly check the lubrication status of the bearing, and replenish or replace the lubricant in time. The replacement cycle of lubricating oil is generally determined according to factors such as the operating time of the equipment and the working environment, usually ranging from a few months to a year; Grease refill intervals are relatively short, typically a few weeks to a few months.

Seal inspection

Regularly check the integrity and effectiveness of the sealing device, and replace it in time if the sealing ring is found to be aged, damaged or the gasket has failed. Ensure that the lubrication environment inside the bearing is not polluted by the outside world, and prevent impurities and moisture from entering the bearing and affecting its normal operation.

Operational monitoring

Temperature monitoring: The operating temperature of the bearing is measured periodically by means of a temperature sensor or thermometer installed near the bearing. Under normal circumstances, the temperature of the bearing should be within the specified range (generally not more than 80°C), if the temperature is found to be too high, it may be caused by poor lubrication, excessive load, improper installation, etc., and it is necessary to stop the machine in time to check and troubleshoot.

Vibration monitoring: Use vibration monitoring instruments to regularly detect the vibration of the bearing, and the vibration value should be within the allowable range. Abnormal vibration may indicate that the bearing has problems such as wear, ball damage, loose installation, etc., and should be analyzed and dealt with in time.

Noise monitoring: listen to the bearing during operation for abnormal noise, such as piercing screams, impact sounds, etc. Noise anomalies can be a sign of damage or poor lubrication of the internal parts of the bearing and require further inspection and repair.

Regular maintenance

Regularly shut down the equipment for maintenance and carry out a comprehensive inspection of the bearings. Check the wear of the bearing, including the inner and outer ring raceways, balls and cages and other components, and replace the bearing in time if it is worn or damaged. At the same time, the mounting parts of the bearings are inspected to ensure the accuracy and surface quality of the shaft and housing bore, and if necessary, the relevant parts are repaired or replaced.

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