Bush Type Flexible Couplings

Sleeve type flexible coupling is a mechanical connection device widely used in industrial transmission systems. It achieves flexible connection between two shafts through elastic sleeve elements, effectively compensating for axial, radial, and angular deviations. Compared with traditional rigid couplings, this design significantly reduces system vibration and impact loads, and extends equipment service life. In the field of mechanical transmission, sleeve type flexible couplings have become the preferred connection solution for small and medium power transmission systems due to their simple structure, easy maintenance, and high cost-effectiveness.

Structural composition and working principle

• Core structural components
  The sleeve type flexible coupling is mainly composed of the following components:
  Metal wheel hub: usually made of cast iron or steel material, responsible for connecting with the drive shaft and the driven shaft
  Elastic lining: made of rubber, polyurethane or other polymer materials, it is the core cushioning element of the coupling
  Connecting bolt: a precision machined fastener that ensures power transmission while allowing for a certain degree of displacement compensation
  Spacer sleeve (some models): used to maintain an appropriate distance between the two halves of the coupling

• Power transmission mechanism
  The power transmission path follows the sequence of drive shaft → active wheel hub → connecting bolt → elastic bushing → driven wheel hub → driven shaft. The elastic lining absorbs vibration energy through its deformation while transmitting torque, compensating for axis deviation. Its working principle is similar to that of a "mechanical shock absorber".

• Deviation compensation capability
  Compensation capability parameters of typical sleeve type flexible couplings:
  Axial displacement: ± 0.5-3mm
  Radial deviation: 0.2-1.5mm
  Angular deviation: 1 ° -3 °
  Torsional stiffness: usually within the range of 50-500Nm/rad depending on the lining material

Selection decision matrix

Multidimensional factors to consider when choosing a sleeve type flexible coupling:

• Load characteristic dimension:
  Steady state torque to peak torque ratio
  Is there frequent start stop
  Frequency of impact load occurrence

• Dimension of environmental conditions:
  Range of environmental temperature fluctuations
  The presence of pollutants such as oil stains and dust
  Do you need explosion-proof or anti-corrosion characteristics

• Space constraint dimension:
  Allowable radial installation dimensions
  Axial spatial constraint
  Maintenance channel requirements

Industry application cases

• Water industry:
  Connect the water pump unit to compensate for deviations caused by pipeline stress
  Typical specifications: for DN100 caliber pump, torque capacity 280Nm, equipped with EPDM rubber liner

• In the field of wind power:
  Small wind turbine speed increasing device
  Special requirements: -40 ℃ low temperature toughness, UV aging resistance

• Intelligent manufacturing:
  Robot Joint Transmission
  Select low clearance polyurethane liner with a torsional stiffness of 350Nm/rad