Accuracy 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.

Accuracy of thin section four-point contact ball bearings

The accuracy of thin section four-point contact ball bearings usually includes dimensional accuracy and rotational accuracy, which can be divided into the following grades, and different grades are suitable for different application scenarios:

P0 (Normal)

Dimensional accuracy: Relatively large tolerances for inner diameter, outer diameter and width. For example, the inner diameter tolerance may be around ±10μm, the outer diameter tolerance around ±15μm, and the width tolerance around ±20μm.

Rotation accuracy: The radial runout and axial runout of the bearing are relatively large, generally the radial runout is 20 - 30μm, and the axial runout is 30 - 40μm.

Application scenario: It is suitable for general rotating equipment that does not require high precision, such as ordinary industrial machinery, small power tools, etc. In the field of medical devices, it can be used for some equipment with relatively low precision requirements, such as ordinary medical centrifuges, non-critical rotating parts of some conventional medical testing equipment, etc.

Level P6 (Intermediate Accuracy)

Dimensional accuracy: Tolerances for inner diameter, outer diameter and width are tighter than P0 class. The inner diameter tolerance is usually around ±5μm, the outer diameter tolerance is around ±8μm, and the width tolerance is around ±10μm.

Rotational accuracy: Radial runout and axial runout are reduced, with radial runout generally at 10 - 15 μm and axial runout at 15 - 20 μm.

Application scenario: It is suitable for equipment with certain requirements for accuracy, such as the feed shaft of machine tools, transmission parts of automated production lines, etc. In medical devices, it can be used for some equipment with moderate precision requirements, such as the rotating parts of some ultrasound diagnostic instruments, the transmission mechanism of some surgical instruments, etc., which can ensure the performance and stability of the equipment.

Class P5 (High Precision)

Dimensional accuracy: The tolerances for the inner diameter, outer diameter and width are further reduced. The inner diameter tolerance can be controlled at about ±2.5μm, the outer diameter tolerance is about ±4μm, and the width tolerance is about ±5μm.

Rotational accuracy: Radial runout and axial runout are smaller, radial runout is usually 5 - 8 μm, and axial runout is 8 - 10 μm.

Application scenario: It is often used in equipment that requires high precision, such as the spindle of precision machine tools, the rotating parts of aero engines, etc. In the field of medical devices, it is widely used in high-end CT scanners, high-precision microscopes, surgical robots and other equipment that requires high precision, which can ensure the high-precision operation of the equipment and improve the accuracy of diagnosis and treatment.

Class P4 (ultra-high accuracy)

Dimensional accuracy: The tolerances of the inner diameter, outer diameter and width are very small. The inner diameter tolerance is generally about ±1.5μm, the outer diameter tolerance is about ±2.5μm, and the width tolerance is about ±3μm.

Rotation accuracy: Radial runout and axial runout are very small, radial runout can be controlled at 2 - 4 μm, and axial runout can be controlled at 4 - 6 μm.

Application scenario: It is mainly used for equipment with extremely demanding precision requirements, such as gyroscopes in the aerospace field and high-precision transmission components for semiconductor manufacturing equipment. In medical devices, it is suitable for advanced PET-CT all-in-one machines, high-end neurosurgical instruments, etc., which can meet the extremely high requirements for precision of these equipment and ensure the high performance and reliability of the equipment.

Class P2 (Extreme High Accuracy)

Dimensional accuracy: It is one of the highest levels of accuracy, and the tolerances of the inner diameter, outer diameter and width are controlled within a very tight range. The inner diameter tolerance can reach about ±0.5μm, the outer diameter tolerance is about ±1μm, and the width tolerance is about ±1.5μm.

Rotational accuracy: Radial runout and axial runout are extremely low, typically 1 - 2 μm in radial runout and 2 - 3 μm in axial runout.

Application scenarios: Generally used in ultra-precision instruments and equipment, such as the rotating parts of high-precision astronomical telescopes, the spindle of nanoscale processing equipment, etc. In the field of medical devices, it may be used in some ultra-high-precision medical devices that are at the forefront of research and development, such as those used for cell-level minimally invasive surgery, but the application is relatively rare because of its extremely high cost and extremely demanding requirements for the manufacturing process and use environment.

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