The drum gear coupling has a continuous multi-turn long slot. This coupling has excellent elasticity and small bearing load. It can withstand deviations and is more suitable for correcting deflection and axial deviation , But the ability to deal with eccentricity is relatively poor, because the spiral groove must be bent in two different directions at the same time, which will generate a large internal pressure, which will lead to premature damage to the coupling.

　　The long spiral groove coupling can be easily bent under the condition of tolerance, but it has the same effect on the rigidity of the coupling under the torsional load, and the excessive swing clearance under the torsional load will affect the coupling The precision and weaken its overall performance.

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