At present, there is a common selection misconception in the industrial sector of "heavy parameters, light matching", such as blindly pursuing high stiffness leading to a sharp increase in energy consumption, or ignoring the instability of the gas film caused by thermal deformation.
Guided by engineering system theory, this article constructs a triple coupling selection model of "size mechanics working condition" for the series of air bearing shaft sleeves. By quantitatively analyzing the nonlinear relationship between radial load and stiffness, as well as the threshold curve of gas supply pressure and bearing efficiency, it provides engineers with a selection decision-making framework that combines theoretical rigor and practical applicability, helping to break through the performance bottleneck of high-end equipment.
1.Analysis of core parameters for selection.
(1) The inner diameter of the shaft sleeve needs to match the diameter of the shaft (considering tolerance fit, usually choosing a model slightly larger than the shaft diameter). For example, when the shaft diameter is 25mm, select model ZYAF-S302501 (inner diameter 25.02mm).
(2) The rated radial load of the selected shaft sleeve for radial load should be greater than the maximum load in actual operating conditions. For example, when the load demand is 200N, selecting ZYAF-S302001 may not be sufficient, and higher load models need to be considered.
(3) The stiffness (N/μ m) determines the anti deformation ability of the shaft system, and high-precision equipment requires the selection of high stiffness models. For example, in high-speed rotating scenarios, ZYAF-S307501 has better stability than low stiffness models.
(4) The installation size limit requires verification of whether the outer diameter and length of the shaft sleeve are compatible with the equipment space. For example, when the outer diameter of the installation space is limited to 60mm, ZYAF-S304001 is compatible.
(5) All models in the gas supply pressure gauge have a gas supply pressure of 0.4MPa, and it is necessary to ensure that the gas source system is matched.
2. The selection recommendation process determines the shaft diameter → screens the matching models of the inner diameter; Verify load → actual load ≤ rated load of shaft sleeve; Checking stiffness → High stiffness should be given priority in high dynamic scenarios; Space adaptation → outer diameter and length meet installation requirements; Comprehensive optimization → Select the most cost-effective model based on meeting the first four criteria.
3. Precautions for dynamic working conditions: If there is high-frequency vibration, it is recommended to leave a 20% margin for the load; Gas source quality: A filtering device needs to be installed to avoid gas path pollution affecting the stability of the gas film; Temperature impact: In high-temperature environments, it is necessary to confirm whether the material's thermal expansion coefficient matches.