Nissei Corporation


No.3 The noise and vibration are large

Reducer (without motor) [Cause and countermeasure]

The noise and vibration are large

Defect of the gear head (3.1)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.1.1 Scratch on the gear (intermittent sound) Repair by Nissei Contact Nissei No abnormal noise occurs
3.1.2 Wear of the gear (continuous sound) Repair by Nissei Contact Nissei No abnormal noise occurs
3.1.3 Damage or breakage of the bearing or shaft Repair by Nissei No abnormal noise occurs and the output shaft rotates smoothly Contact Nissei for the reverse rotation torque and check whether it is within the allowable range
No abnormal vibration nor noise occurs

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Defect of the installation or couplings (3.2)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.2.1 Loosening of the case mounting bolts Retighten the bolts Check whether there is no play in the reducer and, if any, retighten the bolts for connection with the gear Contact Nissei for the tightening torque and check whether it is within the allowable range.
3.2.2 Inconsistency of the centers of the shafts Align the centers of the shafts with each other Check the misalignment amount Report the misalignment amount to the coupling manufacturer and check whether it is within the allowable range
3.2.3 Insufficient rigidity of the mounting base Reinforce the mounting base to improve the rigidity Check that no abnormal vibration nor noise occurs No abnormal vibration nor noise occurs

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Defect of a load part or operating conditions (3.3)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.3.1 Resonance of the load Displace the resonance point Adjust the balance of the load part No abnormal vibration nor noise occurs

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