Product Description

XL Star Type Couplings Elaments Gjl-38 Plum Servo Motor Chain Shaft Coupling Plum Jaw Type Spider Shaft Coupling With Pu Rubber


These are elastomer in compression type couplings. A single piece elastomer (Spider type, Snap-wrap type coupling) is used for low to medium power applications, while individual elastomeric elements are used for high power application (T cushion type coupling). Jaw coupling is a failsafe design, designed for positive torque transmission. The couplings means low mass moment of inertia. The elastomeric component provides torsional flexibility and damping to the system reduces the effect of vibrations and operational shocks. This coupling is capable of compensating for angular, parallel and axial misalignments. The raised dimples on the elastomeric element improve the couplings capability under axial thrusts produced by applications.



1. Hubs made of cast iron GG25.
2. Torsionally flexible, maintenance free, vibration-damping.
3. Axial plug-in, fail-safe.
4. Varying elastomer hardness of spiders.
5. Compact design with small flywheel effect.
6 Easy assembly / dis-assembly of the coupling hubs Short mounting length.




Material Available

Stainless Steel:SS201,SS301, SS303, SS304, SS316, SS416 etc.
35CrMo 40CrMo42 CrMo
Steel:mild steel, Carbon steel, 4140, 4340, Q235, Q345B, 20#, 45#
Aluminum:AL6061, Al6063, AL6082, AL7075, AL5052, A380 etc.
Iron:A36, 45#, 1213, 12L14, 1215 etc.
Plastic:ABS, PC, PE, POM, Delrin, Nylon, , PP,PEI, Peek
or as customer required .

CNC Turning

φ0.5 – φ300 * 750 mm,+/-0.005 mm

CNC Milling

510 * 1571 * 500 mm(max),+/-0.001 mm-+/-0.005 mm

Surface Finish

Aluminum:Clear Anodized,Color Anodized,Sandblast Anodized,Chemical Film,Brushing,Polishing,Chroming.
Stainless Steel:Polishing,Passivating,Sandblasting,Laser engraving.
Steel:Zinc plating,Oxide black,Nickel plating,Chrome plating,Carburized,
Heat treatment,Powder Coated.
Plastic:Painting,Chrome plating,polishing,Sandblast,Laser engraving.

Drawing Format


Test Equipment

Measurement instrument, Projector, CMM, Altimeter, Micrometer, Thread Gages, Calipers, Pin Gauge etc.

Company Information:

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clamp coupling

Accommodating Varying Torque and Speed Requirements with Servo Couplings

Servo couplings are versatile components designed to accommodate varying torque and speed requirements in different applications. Their ability to transmit torque while compensating for misalignment makes them suitable for a wide range of motion control systems. Here’s how servo couplings can accommodate varying torque and speed requirements:

  • Torque Capacity:

    Servo couplings come in various designs and materials, each with its unique torque capacity. By selecting the appropriate coupling type and material, you can match the coupling’s torque capacity to the requirements of the application. For higher torque applications, steel or stainless-steel couplings are preferred, while aluminum or plastic couplings may suffice for lower torque applications.

  • Misalignment Compensation:

    In motion control systems, shaft misalignment can occur due to various factors. Servo couplings can compensate for angular, parallel, and axial misalignments, ensuring smooth operation even when the shafts are not perfectly aligned. This feature helps prevent excessive stress on the coupling and the connected components, making them suitable for applications with varying misalignment conditions.

  • Dynamic Response:

    High-speed motion control systems often require a coupling with excellent dynamic response characteristics. Flexible couplings, such as bellows or elastomeric couplings, can handle rapid changes in speed and direction, providing the necessary flexibility for dynamic applications.

  • Damping and Vibration:

    Some applications may experience vibrations or shocks during operation. Servo couplings made of materials like elastomers or plastics can act as vibration dampeners, reducing the impact of shocks and vibrations on the system.

  • Customization:

    In certain cases, off-the-shelf servo couplings may not fully meet the specific torque and speed requirements of a particular application. In such situations, manufacturers may offer customized servo couplings tailored to the application’s needs, providing a solution that precisely matches the system’s requirements.

Overall, servo couplings are designed to be adaptable and flexible, making them suitable for a wide variety of torque and speed requirements in different motion control applications. Proper selection and installation of the right type of servo coupling can significantly contribute to the overall efficiency, performance, and longevity of the motion control system.

clamp coupling

How Servo Couplings Help in Reducing Vibrations and Resonance during Operation

Servo couplings play a crucial role in reducing vibrations and resonance during the operation of motion control systems. Here’s how they achieve this:

  • Damping Properties: Some servo couplings, especially those made from materials with high damping properties, can absorb and dissipate vibrations. These couplings act as shock absorbers, reducing the impact of sudden changes in motion and minimizing vibrations in the system.
  • Flexibility: Flexible servo couplings have the ability to compensate for misalignments between the motor and the driven load. This flexibility helps distribute the load evenly, preventing excessive forces that may lead to resonance. By accommodating misalignments, flexible couplings also reduce stress on the motor and bearings, minimizing vibrations.
  • Vibration Isolation: Some servo couplings, such as elastomeric couplings, have inherent vibration isolation properties. The elastomeric material acts as a cushion, isolating the motor and driven load from external vibrations and disturbances that could affect system performance.
  • Reduced Backlash: Zero-backlash couplings eliminate play between coupling components, preventing sudden changes in motion direction. This reduction in backlash reduces the chances of vibrations caused by rapid acceleration or deceleration and ensures smooth and stable motion.
  • Dynamic Balancing: Certain servo couplings are precisely balanced during the manufacturing process. This dynamic balancing helps counteract any rotational imbalance in the system, reducing vibrations caused by uneven distribution of mass.
  • Torsional Stiffness: Servo couplings with appropriate torsional stiffness prevent excessive twisting or deflection during operation. This stiffness maintains the stability of the system and minimizes vibrations.

By effectively reducing vibrations and resonance, servo couplings contribute to the overall performance and reliability of motion control systems. The selection of the right coupling type, taking into consideration the specific requirements of the application, is essential to ensure optimal vibration damping and smooth operation.

clamp coupling

Differences between Rigid, Flexible, and Beam-Type Servo Couplings

Servo couplings come in various designs to suit different motion control applications. Here are the key differences between rigid, flexible, and beam-type servo couplings:

  • Rigid Servo Couplings:
    • Rigid servo couplings do not have any flexibility or movable parts.
    • They provide a solid and direct connection between the servo motor shaft and the driven load.
    • These couplings offer excellent torque transmission with minimal backlash.
    • Rigid couplings are suitable for applications where precise alignment between the motor and load is achievable.
    • They are commonly used in systems that require high torque transmission and minimal motion losses.
    • However, rigid couplings cannot compensate for misalignments, making them sensitive to any shaft misalignment, which may cause premature wear and reduce system lifespan.
  • Flexible Servo Couplings:
    • Flexible servo couplings are designed to accommodate misalignments between the motor and load shafts.
    • They have a certain degree of flexibility, allowing them to bend or deform slightly to compensate for angular, axial, and parallel misalignments.
    • Flexible couplings offer improved misalignment compensation compared to rigid couplings.
    • They help reduce stress on bearings and other sensitive components, increasing the system’s reliability and lifespan.
    • Flexible couplings are suitable for applications with moderate misalignments and where some level of damping or vibration absorption is required.
    • However, flexible couplings may introduce some backlash and have lower torsional rigidity compared to rigid couplings.
  • Beam-Type Servo Couplings:
    • Beam-type servo couplings are a subtype of flexible couplings and are known for their helical beam design.
    • They offer multi-directional flexibility, allowing them to handle angular, axial, and parallel misalignments.
    • Beam couplings provide excellent torsional stiffness, making them ideal for high-speed and high-precision applications.
    • These couplings have low inertia, reducing the impact on the motor’s acceleration and deceleration capabilities.
    • Beam-type couplings are commonly used in applications that require both precise motion control and flexibility for misalignment compensation.
    • However, beam couplings have limited torque capacity compared to some other flexible coupling designs.

Choosing the right servo coupling depends on the specific needs of the motion control system. Rigid couplings are ideal for applications with perfect alignment, while flexible and beam-type couplings are suitable for applications with misalignments and where damping, vibration absorption, and motion control precision are critical.

China Professional XL Star Type Couplings Elaments Gjl-38 Plum Servo Motor Chain Shaft Coupling Plum Jaw Type Spider Shaft Coupling with PU Rubber  China Professional XL Star Type Couplings Elaments Gjl-38 Plum Servo Motor Chain Shaft Coupling Plum Jaw Type Spider Shaft Coupling with PU Rubber
editor by CX 2024-03-03