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Related knowledge of bearing clearance

wallpapers News 2021-01-19
The structure of rolling bearings is divided into the inner ring, outer ring, and rolling elements. The rolling elements on the inner and outer rings are called rolling surfaces. The rolling of a ball bearing ring is also called a raceway. Generally speaking, the inner diameter of the inner ring and the outer diameter of the outer ring is properly matched with the shaft and the housing during installation. Rolling bodies are divided into two categories: balls and rollers. Rollers are divided into cylindrical rollers, tapered rollers, spherical rollers, and needle rollers according to their shapes. The cage partially surrounds the rolling elements to maintain a certain interval in the circumferential direction. According to different materials, it can be divided into steel frame cage, nylon cage, and so on.
Bearing internal clearance
The so-called internal clearance of the bearing refers to the amount of movement when the bearing is not installed on the shaft or the bearing box, the inner ring or the outer ring is fixed, and then the unfixed side is moved radially or axially. According to the direction of movement, it can be divided into radial clearance and axial clearance. When measuring the internal clearance of the bearing, in order to stabilize the measured value, a test load is generally applied to the ring. Therefore, the test value is larger than the actual clearance value, that is, one more elastic deformation caused by the test load. According to the direction of movement, it can be divided into radial clearance and axial clearance. The size of the clearance (called the working clearance) during operation has an impact on the bearing's rolling fatigue life, temperature rise, noise, vibration, and other properties.
The role and requirements of bearing clearance
The clearance in the bearing is to ensure that the bearing can run flexibly and without hindrance, but it is also required to ensure that the bearing runs smoothly, the axis of the bearing does not significantly sink, and the number of rolling elements that bear the load is as large as possible. Therefore, the bearing clearance has a great influence on the dynamic performance and rotation accuracy of the bearing and the bearing capacity of the service life.

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