The shaft body/journal is the cylindrical load-bearing section of a ball screw shaft that rotates within bearings to transmit motion and force.
The shaft body, also known as the journal, is the central cylindrical section of a ball screw shaft designed to interface with support bearings. This precision-ground component provides the rotational axis for the screw, maintains alignment under axial and radial loads, and ensures smooth motion transmission by minimizing deflection and vibration. Its dimensional accuracy and surface finish directly impact the ball screw's positioning precision, load capacity, and service life.
诱因 → 失效模式 → 工程缓解
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In ball screw context, 'shaft body' refers to the entire cylindrical section, while 'journal' specifically denotes the bearing contact surfaces. However, these terms are often used interchangeably for the load-bearing portion.
Tighter diameter tolerances (e.g., h5 vs. h6) reduce bearing clearance, improving rigidity and positioning accuracy but requiring more precise mounting. Looser tolerances accommodate thermal expansion but may increase vibration.
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