How to determine the accuracy class of a four-point contact ball bearing?

What is thin section four point contact ball bearing?

Thin section four point contact ball bearings are 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 to determine the accuracy class of a four-point contact ball bearing?

When purchasing thin section four-point contact ball bearings, there are several ways to determine their accuracy class:

View product identification

Bearing designation: In general, the bearing designation will contain information about the accuracy class. For example, in some common bearing designation schemes, the suffix letters or numbers represent the accuracy class. For example, "P5" indicates that the accuracy level is 5, "C3" indicates that the clearance group is 3 groups (which is related to accuracy), etc. Different bearing manufacturers may have different model designations, so you need to refer to the corresponding product manual or consult the manufacturer.

Labeling or packaging: The accuracy class is usually clearly marked on the outer packaging, label or product insert of the bearing. For example, the words "Accuracy class: P4" will be printed directly. These markings should be clear, accurate, and comply with relevant standards and specifications.

Check the cosmetic quality

Surface roughness: The surface roughness of the raceway and rolling elements of high-precision bearings is usually lower, the surface is smoother and more delicate, and there are almost no traces of machining. Bearing surfaces with low accuracy grades may have some fine knife lines or unevenness.

Dimensional accuracy: High-precision measuring tools, such as micrometers, calipers, etc., can be used to measure the inner diameter, outer diameter, width and other dimensions of the bearing. The measurement results are compared to the standard tolerances of the corresponding accuracy class to determine whether they meet the requirements. For example, a bearing bore bore tolerance of P5 accuracy may be around ±2.5μm, and if the actual dimensional deviation measured is outside of this range, it may not be P5 accuracy.

Refer to manufacturer qualifications and certifications

Production Qualification: Manufacturers with good reputation and qualifications will usually produce bearings in accordance with strict quality standards and can provide accurate accuracy class identification. For example, some manufacturers that have passed the ISO 9001 quality management system certification have their production processes strictly monitored, and the quality of their products is more guaranteed.

Product certification: Some high-precision bearings may pass special certifications, such as bearings in the aerospace field may pass relevant aviation certifications. These certifications signify that bearings meet specific high-precision requirements and can be used as an important basis for judging their accuracy class.

Conduct performance testing

Rotation accuracy test: Use professional rotation accuracy testing equipment, such as bearing runout measuring instrument, to measure the radial runout and axial runout of the bearing during rotation. There is a clear standard range for the run-out values of bearings of different accuracy classes. For example, the radial runout of a bearing with P4 accuracy is typically 2 - 4 μm, and the runout value can be measured to determine whether the accuracy class of the bearing meets the requirements.

Clearance measurement: clearance is an important parameter of bearing, and it is also related to the accuracy level. The radial and axial clearance of bearings can be measured using a dedicated clearance gauge and compared to the standard clearance range in the respective accuracy class. In general, bearing clearance control is more stringent in the high-precision grade.

If there are strict requirements for the accuracy level of the bearing, it is recommended to choose a formal channel to purchase, such as directly from the manufacturer or authorized dealer, and require the quality certification documents and test reports of the product to ensure that the thin section four-point contact ball bearings that meet the accuracy requirements are purchased.

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