Coupling (Shaft Coupling )

Coupling (shaft coupling) is a mechanical element used to connect a drive shaft and a driven shaft to transmit the motor's power to a device.

Couplings also play various roles in the connection between the drive and driven shafts, such as absorbing shaft misalignment (mounting error), softening motor vibration, suppressing heat transfer from the motor to the equipment, and preventing motor or equipment failure by damaging the coupling in the event of some problem.

What is a coupling (shaft coupling)?

・It is a part for connecting the shaft (driving unit side) and the shaft (driven unit side).

Coupling is used to connect the drive shaft (e.g. motor) to the driven machine such as a pump opposed. It is also called a shaft coupling.

Product photo

Role of coupling (shaft coupling)

Roles ①:Transmits rotational force (torque) to the opposit shaft.

Structural drawing

Roles ②:Absorbs mounting misalignment.

Structural drawing

Coupling products list

Rigid Couplings (Power Rigid Couplings ):Light-weight, Low inertia, Backlash-free, Lubrication-free

Power Rigid Coupling with highest torsional stiffness specifically designed for machine tool applications.

While it has high torsional stiffness, it has no flexible elements and cannot absorb misalignment.

Use it only when secure centering is possible.

(Not recommended for general purpose use )

Power Rigid Couplings

Model No.  EPR□□~

View product details

Tsubaki's Power Rigid Coupling is a rigid coupling for machine tools. It employs a taper-lock structure to ensure a more reliable connection.

  • ・Compatible with straight shafts and taper shaft. :
    Compatible with taper shaft servomotors. Apply Φ11 taper shafts and adaptors for Φ16 taper shafts.
  • ・High Torsional Stiffness :
    Does not have a flexible structure, this type has high rigidity.
  • ・Non-backlash :
    There is no backlash due to the friction of the coupling through a taper-lock.
  • ・Compact & Low Moment of Inertia :
    The axial length is maximally reduced, allowing for more compact design. Also provides lower moment of inertia through the polygonal outer ring configuration.
Applicable shaft diameter

Φ16mm~Φ48mm

Torque range

78~489N・m