Spiral groove type flexible coupling and parallel groove type flexible coupling

- Dec 08, 2017 -

Flexible couplings are usually made of metal wire rod cutting, commonly used materials are aluminum, stainless steel, engineering plastics. Flexible couplings use parallel or spiral grooving systems to accommodate a wide range of deviations and precise torque transmission. Flexible couplings usually have good performance and have the price advantage, in many stepping, servo system practical applications, the elastic coupling is the preferred product. The one-piece design allows flexible couplings to deliver zero-clearance torque and maintenance-free benefits. Flexible coupling mainly has the following two basic series: spiral groove and parallel groove.
Spiral groove flexible coupling has a continuous multi-turn long groove, this coupling has a very good elasticity and a small bearing load. It can withstand a wide range of deviations and is best suited for correcting declination and axial misalignments, but its ability to handle eccentricities is poor because simultaneously bending the spiral groove in two different directions creates a significant internal pressure Lead to premature coupling damage. Although long spiral groove couplings can easily bend under various deviations, they also have the same effect on the rigidity of the coupling in the case of torsional loads. Large torsion load under the rotary clearance will affect the accuracy of coupling and weaken the overall performance.
Spiral groove type flexible coupling is a more economical choice, best suited for low torque applications, especially in coupled encoders and other lighter instruments.
Parallel slotted flexible couplings typically have 3-5 slots to handle the low torque stiffness issues. Parallel Grooves allow for shortening of slots without compromising ability to tolerate corrections. Short grooving enhances and overlaps the torsional rigidity of the coupling, enabling it to withstand considerable torque. This performance makes it suitable for light-duty applications. For example, the servo motor and ball screw coupling. However, this performance with the increase of grooving size, the bearing load will increase, but in most cases, can effectively protect the bearing. Increasing the size means increasing the ability to withstand eccentricities.
Now most of the flexible couplings are made of aluminum alloy, of course, there are stainless steel flexible coupling. Stainless steel flexible coupling in addition to corrosion resistance, but also increased the torque capacity and rigidity, and even up to twice the similar products made of aluminum alloy. However, this increased torque and stiffness are offset to some extent by the added mass and inertia. Sometimes the negative effects outweigh the advantages, so users have to look for other forms of coupling

  • Bearing Races
  • Baffle Plate
  • Nozzle
  • Hydro Turbine Shaft
  • Blower Shaft
  • Blind Flange

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