What specific components can be damaged if the fit between the output shaft of the XLD8-11-15KW cycloidal reducer and the inner hole of the coupling is too loose

1、 Damaged direct fitting components at the shaft end

Output shaft neck: The mating surface is repeatedly rubbed and impacted, and the shaft diameter is quickly ground down. When the wear exceeds 0.1mm, the surface quenching layer will be damaged, causing fatigue cracks and even shaft breakage.

Coupling inner hole: The inner hole is worn out of roundness by alternating impact, and the original H7/k6 transition fit is completely ineffective. The cast iron material coupling may even have inner hole cracking.

Flat key and keyway: The flat key undergoes rolling and shear deformation under impact load, causing the keyway side walls on the output shaft and coupling to be squeezed and cracked, completely losing torque transmission capability.

Coupling locking components: The top thread and locking bolt slide under continuous vibration, causing the tightening nut to loosen and fail. In extreme working conditions, the coupling is directly thrown out from the shaft end.

2、 Internal shaft components of the reducer are damaged

Output end support bearing: The radial runout caused by excessive looseness causes the bearing to withstand alternating overload, leading to premature fatigue peeling of rolling elements and raceways, forced swinging and fracture of the cage, and rapid loss of clearance.

Output shaft seal: The eccentric movement of the shaft repeatedly pulls and pulls the sealing lip, causing rapid wear and tear of the rubber lip, lubricant leakage, and external impurities entering the interior of the box.

Cycloid gear and needle gear assembly: The shaft vibration is transmitted internally, and the meshing surface between the cycloid gear and the needle gear is subjected to high-frequency impact, resulting in pitting and peeling of the tooth surface, and the radial clearance of the needle gear sleeve rapidly exceeding the standard.

Eccentric bearing: The additional radial force causes the contact stress of the eccentric bearing to fluctuate, quickly exceeding the standard clearance of 0.02-0.05mm and causing periodic abnormal noise inside the gearbox.

3、 The accessory components of the coupling are damaged

Elastic components: Elastic components such as plum blossom pads and star shaped adhesives are subjected to repeated uneven compression, resulting in cracks, missing pieces, or even complete fragmentation, completely losing their buffering and compensation capabilities.

Coupling flange surface: The flange connection surface of the rigid coupling is subjected to alternating impact, and the connecting bolts are subjected to additional shear force, resulting in thread deformation, bolt fracture, and local cracking of the flange plate.

Diaphragm/Buffer Plate: The metal diaphragm of the diaphragm coupling and the stainless steel buffer plate of the fan transmission shaft experience fatigue fracture under high-frequency vibration, causing the transmission chain to disconnect directly.

4、 Damage to related power and load components

Motor bearings: Vibration is transmitted in the reverse direction along the transmission chain, and the motor output shaft bearings bear additional radial force, resulting in increased operating noise, abnormal temperature rise, and significantly shortened service life.

Load side input shaft: The journal and keyway of the input shaft of the load equipment connected to the other end of the coupling are synchronously worn due to impact, and the clearance of the load end bearing quickly exceeds the standard, causing vibration failure of the entire equipment.

Deterioration of lubricating oil performance: Metal abrasive particles generated by the wear of the mating surface mix into the lubricating oil, causing the oil film to be repeatedly squeezed and broken, deteriorating the lubrication conditions, and further accelerating the abrasive wear of all meshing and rotating components.