Curved Tooth Gear Couplings

Curved Tooth Gear Coupling is a flexible coupling with a unique structure. It achieves shaft to shaft connection through a specially designed drum shaped gear profile, which can effectively compensate for radial, axial, and angular deviations between two shafts. Compared with traditional spur gear couplings, the drum tooth design significantly improves transmission efficiency and service life.

This type of coupling consists of two shaft sleeves with external gears and a drum shaped sleeve with internal gears. The external gears mesh with the internal gears through a lubricating oil film, transmitting torque while allowing for some relative motion. The "drum shape" in its name comes from the special drum shaped shape of the sleeve, which is the key to its outstanding performance.

Core structural components:

• Shaft sleeve component: usually made of high-strength alloy steel, precision machined and heat-treated, with a surface hardness of HRC58-62
  

• Drum shaped sleeve: with a special drum shaped internal tooth structure, the internal teeth are precision ground, and the contour accuracy is controlled within 0.01mm
  

• Sealing system: adopting multiple sealing designs, including radial sealing and end face sealing, to ensure that lubricant does not leak
  

• Lubrication channel: Built in optimized lubrication oil circuit to ensure sufficient lubrication of the tooth surface

Modern Curved Tooth Gear Couplings are usually made of high-quality alloy steels such as 42CrMo and 20CrMnTi, with surface carburizing, quenching or nitriding treatment. The tooth surface hardness can reach HRC58-62, and the core maintains the toughness of HRC30-35. Some special applications may use stainless steel or special alloy materials.

The Curved Tooth Gear Coupling achieves multifunctional compensation through its unique geometric shape:

• Radial compensation: The drum shaped tooth profile allows for radial displacement of the shaft sleeve within a certain range, with a typical compensation amount of 0.5-3mm, depending on the size of the coupling.
  

• Angular compensation: The drum shaped design allows the coupling to adapt to shaft to shaft angles of 1 ° -1.5 °, with high-end products reaching up to 2 °.
  

• Axial compensation: By designing the tooth flank clearance, axial displacement compensation of ± 2mm to ± 10mm can be achieved.

Torque is transmitted through the contact pressure of the meshing tooth surface, forming an elastic fluid dynamic lubrication film in the contact area, reducing the friction coefficient (usually 0.05-0.08). Advanced design adopts modified involute tooth profile, resulting in a more uniform distribution of contact stress. The theoretical calculation of contact stress is usually controlled within the range of 800-1200MPa.

Technical advantages of Curved Tooth Gear Coupling

• Excellent deviation compensation capability:
  Simultaneously compensate for radial, angular, and axial deviations
  Compensation capability is 30-50% higher than that of spur gear couplings
  Especially suitable for working conditions with foundation settlement or thermal deformation

• High transmission efficiency:
  Efficiency can reach 98.5% -99.2%
  The power loss is only 60-70% of that of ordinary couplings

• Long life design:
  The design lifespan typically ranges from 50000 to 100000 hours
  Excellent wear resistance, with a wear rate of less than 0.01mm/1000h

• Vibration and noise control:
  The dynamic balance level can reach G2.5
  The noise level is 5-8dB lower than traditional couplings

• Maintenance simplicity:
  Adopting a long-term lubrication design, the maintenance cycle reaches 8000-10000 hours
  Modular design facilitates quick replacement

Application fields of Curved Tooth Gear Coupling

Typical applications in the industrial field:

• Metallurgical industry:
  Main transmission system of rolling mill
  Continuous casting machine sector drive
  Large blower drive

• Energy and electricity:
  Steam turbine generator set
  Large scale water pump unit
  Wind turbine

• Ship engineering:
  Main propulsion system
  Shaft connection
  Auxiliary transmission

• Petrochemical industry:
  Compressor transmission
  Large pump unit
  Reaction kettle stirring system

• Mining Machinery:
  Ball mill transmission
  Crusher drive
  conveying system

As a key component of modern industrial transmission, the Curved Tooth Gear Coupling is constantly advancing towards higher performance, longer lifespan, and greater intelligence in its technological development, providing more reliable connection solutions for various industrial equipment.