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How to connect bearings and shafts
Release time:
2025-03-28 09:19
The connection methods between bearings and shafts are diverse. Specific choices need to be comprehensively considered based on the working conditions of the equipment, bearing type and installation requirements. Interference coordination, hot installation, cold installation and axial limiting are commonly used methods, each of which has its own unique advantages and applicable scenarios.
The connection between bearings and shafts is a key link in mechanical assembly, and its connection method directly affects the operating stability and life of the equipment. Here are several main methods for connecting bearings and shafts:
1. Interference Cooperation
Principle: Interference fit refers to the diameter of the shaft slightly larger than the diameter of the bearing inner ring. Through tight fit, the bearing inner ring is firmly inserted on the shaft to form a whole. This method is suitable for situations where high stability and low vibration are required.
Application Scenario: Commonly used in equipment with high rotation accuracy requirements, such as motors, precision machine tools, etc.
2. Hot and cold installation
Heat installation: The inner ring of the bearing is expanded by heating, and then quickly put it on the shaft, and after cooling, it forms a tight fit. This method is suitable for large bearings or situations with large interference.
Cold installation: Use liquid nitrogen to cool and shrink the shaft, then install the bearing, and form a tight fit after the shaft returns to normal temperature. This method is usually used in small shaft parts.
Advantages: Hot and cold installation avoid damage to the bearing by mechanical pressure, while ensuring the tightness of the fit.
3. Axial limit
Shoulder limit: Process steps (shoulder) on the shaft to limit the axial movement of the bearing through the shaft shoulder. This method is simple and reliable and suitable for most occasions.
Elastic retaining ring: Process the retaining ring groove on the shaft and install the elastic retaining ring (cluster) for limiting position. This method is suitable for occasions where frequent disassembly is required.
Ring fixation: Fix the stop ring to the shaft by tightening screws to limit the axial movement of the bearing. This method is suitable for situations where large axial loads are required.
4. Fix the conical sleeve and the round nut
Conical sleeve: Used for bearings on the optical axis and the inner ring is a conical hole. The axial fixation of the inner ring of the bearing is achieved through radial compression of the tapered sleeve.
Round nut: Used in conjunction with the stop washer, and the bearing is axial fixated by tightening the round nut. This method is safe and reliable and suitable for high-speed rotating equipment.
5. Press press
Method: Use a press to press the bearing on the shaft, suitable for small bearings or small interference. During pressing, soft metal materials (such as copper or mild steel) must be placed on the end surface of the bearing inner ring to avoid damage.
Note: During the pressing process, you need to ensure smooth operation to avoid scratches on the raceway surface.
Summary: The connection methods between bearings and shafts are diverse. Specific choices need to be comprehensively considered based on the working conditions of the equipment, bearing type and installation requirements. Interference coordination, hot installation, cold installation and axial limiting are commonly used methods, each of which has its own unique advantages and applicable scenarios.
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