In electric motor assembly, press-fitting gears and oil seals is a precision operation where tolerances measured in microns determine long-term reliability.

Oil Seal: The Guardian of Lubrication

Its core function is to retain lubricant within the chamber. Failure can lead to leakage, insufficient lubrication, and premature wear of gears and bearings.

The High Cost of Misalignment

Pressing a gear onto a shaft with even slight tilt (misalignment) introduces:

·Radial runout

·Gear meshing noise

·Abnormal bearing load

Similarly, if the oil seal lip is not coaxial with the shaft journal, it causes:

·Eccentric wear

·Overheating

·Oil leakage

Interference Fit: A Delicate Balance

·Excessive interference risks gear hub cracking and shaft galling.

·Insufficient interference leads to slippage, fretting wear, and eventual failure accompanied by abnormal noise.

Mastering this process is not just about assembly—it's about ensuring longevity, efficiency, and quiet operation.