Material flexing and mechanical flexing are the two basic types of pipe couplings. The flexibility of the material flexible kinds is obtained by stretching or compressing a resilient material, such as rubber, or by flexing tiny metallic discs or grids. With the exception of grid couplings, material flexing couplings do not need lubrication.

Mechanical flexing couplings accommodate misalignment caused by metal surfaces swaying, rolling, or sliding. Lubrication is required for all metal mechanical flexing connections.

Couplings for Material Flexing

Material flexing couplings are able to accommodate angular, parallel, and axial misalignment and do not need lubrication. They function in shear or compression and can take angular, parallel, and axial misalignment.

Jaw, sleeve, tyre, disc, grid, and diaphragm couplings are examples of material flexing couplings.

Couplings for Jaws

The jaw coupling is a flexing material coupling that transfers torque by compressing an elastomeric spider insert between two intermeshing jaws.

  • NBR, polyurethane, Hytrel, or Bronze are popular materials for flex elements.
  • Allows for misalignment.
  • Torque is transmitted.
  • Used to attenuate torsional vibrations (vibration)

General-purpose applications with low torque

Coupling Sleeves

Through an elastomeric insert with male splines that fit with female hub splines, the sleeve coupling transfers low to medium torque between linked equipment in shear. EPDM, Neoprene, or Hytrel are common insert materials, and the insert might be one or two pieces.

Misalignment is moderate.

  • Torsion dampening is a kind of dampening that is used to reduce the (vibration)
  • End float with axial clearance of a few millimetres
  • General-purpose applications with low to medium torque
  • Coupling for Tires

A rubber or polyurethane part is attached to two hubs in a tyre connection. In shear, the rubber element transfers torque.

  • Shock or vibration transmission is reduced.
  • High capacity for misalignment
  • With no moving hubs or associated equipment, assembly is simple.
  • Operation at a moderate to high pace
  • Torque capacity in a wide range

Coupling Disc

The torque is delivered by flexing disc parts in the disc coupling operating concept. It works by alternating between the driving and driven sides, tensioning and compressing chorded segments on a shared bolt circle. Two hubs, two-disc packs, and a centre member are common components of these couplings. Angular and axial misalignment may both be accommodated by a single disc pack. To compensate for parallel misalignment, two-disc packs are required.

  • Allows for axial and angular misalignment.
  • A design with no backlash
  • Balance and a high-speed rating
  • Diaphragm Coupling is a kind of diaphragm coupling that connects

For the flexible parts, diaphragm couplings use a single or a series of plates or diaphragms. It transfers torque from the outside to the interior diameter of a flexible plate, then over the spool or spacer piece and back to the outer diameter. When the diaphragm is misaligned, it results in deflection of the outer diameter relative to the inner diameter. Axial displacement efforts, for example, strain the diaphragm, resulting in elongations and bending of the diaphragm profile.

  • Allows for significant axial misalignment, angular misalignment, and parallel misalignment.
  • Used in situations requiring a lot of torque and a lot of speed.

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