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Crossed Roller Bearings in Medical Imaging Equipment
In medical imaging equipment, rotational smoothness and positioning accuracy decide whether a scan produces a diagnostic image or a motion artifact. Crossed roller bearings in medical imaging equipment support the gantry, the patient table, and the C-arm, holding each assembly steady while it rotates or translates. The rollers sit at right angles inside integrated one-piece rings, so a single bearing carries radial load, axial load, and tilting moment without the stack height of a paired arrangement.
These bearings are built for low runout and vibration-free rotation. Line contact between the rollers and the raceways spreads the load across a wide area, which keeps deflection low and removes the ball-pass excitation that would otherwise appear as image noise. Factory-set preload eliminates internal clearance before the gantry ever turns, so the bearing resists from the first increment of load and returns to the same angular position on every rotation. Available accuracy grades let the assembly be matched to the slice resolution the scanner must deliver.
Yuanhe manufactures crossed roller bearings for CT gantries, patient tables, surgical C-arms, and other medical imaging systems. Our RAU integrated ring construction and factory preload deliver repeatable positioning, quiet rotation, and long service life, helping equipment builders hold their imaging tolerances without adding bearings or on-site adjustment to the assembly. Sealed configurations hold their grease supply for years of clinical duty with no scheduled re-greasing.
Yuanhe delivers precision and stability in medical imaging equipment
- RAU integrated one-piece rings hold the raceways true, keeping gantry runout low across the full rotation
- Factory-set preload removes internal clearance, so the assembly repeats the same position on every scan
- Line contact spreads load across the rollers, reducing vibration that would appear as motion artifact
- One bearing carries radial load, axial load, and tilting moment, saving stack height in a compact gantry
- Accuracy grades from P5 through P2 match the bearing to the slice resolution of the imaging system
- Sealed designs protect the grease for years of continuous clinical operation without re-greasing
Bearing Options for an Imaging Gantry or Table
| Assembly | Motion | Bearing Requirement |
|---|---|---|
| CT gantry ring | Continuous rotation | Low runout, vibration-free, large bore for the patient aperture |
| Patient table | Linear travel | Stiffness under patient load, repeatable positioning |
| Surgical C-arm | Orbital indexing | Moment stiffness, holds position during exposure |
Each of these assemblies rotates or translates under a combined load and must hold position precisely, which is what a crossed roller bearing is built for. Where the machine only spins a light shaft, such as a cooling fan or a small drive motor, standard deep groove ball bearings remain the efficient choice. The RAU series is specified for the positioning axes that carry the imaging chain itself.
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