Transmission Chain
ALIGNMENT
Figure 1 - Transmission Chain
Mode of Failure:
Alignment
Application:
Simple transmission chain drive.
Failure Mode:
Rubbing wear on the face of the side plates, the end of the side plates and the pin end.
Diagnosis:
The chain has been rubbing against some fixed point on the circuit. This may have caused damage to parts of the guide system or fixtures.
Solution
Plate Wear | Pin Wear
Realign the chain drive before the damage to the chain becomes too serious and the chain has to be scrapped.
Figure 14 - Transmission Chain
Mode of Failure:
Lubrication & Alignment
Application:
1" P BS duplex chain driving a flywheel on a 400 Tonne press.
Failure Mode:
Excessive wear. Chain jumping teeth causing tooth rounding.
Diagnosis:
Examination of the chain showed no lubrication had been applied in the 6 months service life. The loads involved require a minimum of oil sump lubrication. In addition to this the centre distance was higher than recommended and the sprockets were out of line.
Excessive Wear
Solution
Improve the lubrication method. Consider hardening the driver teeth. Correct the drive alignment.
Figure 15 - Transmission Chain
Mode of Failure:
Lubrication & Alignment
Application:
1" P BS duplex chain driving a flywheel on a 400 Tonne press.
Failure Mode:
Excessive wear. Chain jumping teeth causing tooth rounding.
Diagnosis:
Examination of the chain showed no lubrication had been applied in the 6 months service life. The loads involved require a minimum of oil sump lubrication. In addition to this the centre distance was higher than recommended and the sprockets were out of line.
Excessive Wear
Solution
Improve the lubrication method. Consider hardening the driver teeth. Correct the drive alignment.
Figure 16 - Transmission Chain
Mode of Failure:
Lubrication & Alignment
Application:
Special 2.5" P ANSI simple chain used for conveying in a mine.
Failure Mode:
Slip fit connecting link pin suffered a fatigue failure.
Diagnosis:
The joint was extremely dry and showed no signs of lubrication. The joint showed heavy galling with the presence of surface corrosion products. Subsequent investigation revealed that the chain had been running in water, but more significantly that the user had opened out the holes on the loose plate of the No 58 joint to make assembly easier. This caused the fatigue failure experienced.
Fatigue Failure
Solution
Provide a better lead in on the pin to enable the user to assemble more easily. Reconsider lubrication regime.