Product Description

A beam coupling, also known as helical coupling, is a flexible coupling for transmitting torque between 2 shafts while allowing for angular misalignment, parallel offset and even axial motion, of 1 shaft relative to the other. This design utilizes a single piece of material and becomes flexible by removal of material along a spiral path resulting in a curved flexible beam of helical shape. Since it is made from a single piece of material, the Beam Style coupling does not exhibit thebacklash found in some multi-piece couplings. Another advantage of being an all machined coupling is the possibility to incorporate features into the final product while still keep the single piece integrity.

Changes to the lead of the helical beam provide changes to misalignment capabilities as well as other performance characteristics such as torque capacity and torsional stiffness. It is even possible to have multiple starts within the same helix.

 The material used to manufacture the beam coupling also affects its performance and suitability for specific applications such as food, medical and aerospace. Materials are typically aluminum alloy and stainless steel, but they can also be made in acetal, maraging steel and titanium. The most common applications are attaching encoders to shafts and motion control for robotics.

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Type	Description	Bore(mm)
BR	D18L25	4~6.35
	D20L25	4~8
	D25L30	5~12
	D32L40	8~16
DR	D12L19	3~6
	D16L24	3~6.35
	D18L25	3~10
	D25L30	5~14
BE	D16L23	3~6
	D18L25	3~6.35
	D20L26	4~8
	D25L31	5~12
	D32L41	6~16

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Torque and Speed Ratings for Different Sizes and Materials of Beam Couplings

The torque and speed ratings of beam couplings vary depending on their size, design, and material composition. Different manufacturers offer beam couplings in various configurations to meet specific application requirements. Here are some general considerations regarding torque and speed ratings for different sizes and materials of beam couplings:

• Size and Design:

  Beam couplings come in different sizes and designs to accommodate various shaft diameters and misalignment compensation needs. Larger beam couplings typically have higher torque ratings, as their size allows for more robust construction and increased torsional rigidity. Likewise, different designs, such as single-beam, multi-beam, or bellows couplings, can affect the torque and speed capabilities.

• Material Composition:

  The choice of material for beam couplings significantly impacts their torque and speed ratings. Common materials used in beam couplings include stainless steel, aluminum, and other high-strength alloys. Stainless steel couplings generally have higher torque ratings and are more suitable for high-speed applications due to their excellent mechanical properties and resistance to wear and corrosion.

• Manufacturer Specifications:

  Each manufacturer provides specific torque and speed ratings for their beam coupling products. These ratings are determined through extensive testing and analysis to ensure reliable and safe operation within the specified limits. Always refer to the manufacturer’s datasheets and technical documentation for accurate and up-to-date information on torque and speed ratings.

• Operating Environment:

  The operating environment can also influence the torque and speed ratings of beam couplings. Factors such as temperature, humidity, and exposure to chemicals or harsh conditions may affect the material properties and performance of the coupling. Consider the application’s specific environment when selecting the appropriate coupling.

It is crucial to choose a beam coupling that matches the torque and speed requirements of your application. Exceeding the rated torque or speed can lead to premature wear, coupling failure, and potential damage to other system components. Conversely, selecting a coupling with excessive torque or speed capacity may result in unnecessary costs and reduced system efficiency.

When selecting a beam coupling, always consult the manufacturer’s documentation and consider the specific application requirements to ensure that the chosen coupling can handle the intended torque and speed levels effectively and safely.

Beam Couplings Accommodating Different Shaft Diameters and Mounting Configurations

Beam couplings are highly versatile and can accommodate different shaft diameters and mounting configurations, making them suitable for a wide range of motion control applications. Their design and construction allow for flexibility in adapting to various shaft sizes and mounting setups. Here’s how beam couplings achieve this:

• Multiple Bore Sizes:

  Beam couplings are available in various bore sizes to match different shaft diameters. Manufacturers offer a wide range of coupling sizes, ensuring that there is an appropriate coupling size available to fit the specific shaft diameter of your application. Some beam couplings come with set screws or clamps that securely fasten onto the shafts, accommodating shafts of different sizes within the coupling’s specified range.

• Clamp or Set Screw Mounting:

  Beam couplings commonly employ clamp or set screw mounting methods to connect to the shafts. Clamp-style couplings use split hubs that can be tightened around the shaft with screws, providing a secure and concentric connection. Set screw couplings, on the other hand, utilize screws to press against the shaft, achieving a firm and non-marring grip.

• Step Bores and Adapters:

  In cases where the shafts have significantly different diameters or when transitioning between metric and imperial measurements, some beam couplings offer step bores or adapter options. Step bores feature multiple bore sizes within the same coupling, allowing for flexibility in accommodating various shaft diameters. Adapters are also available to bridge the gap between different shaft sizes.

• Customization:

  For unique or specialized applications, manufacturers may offer customization options for beam couplings. This could include modifying the bore sizes, lengths, or other design parameters to suit specific shaft dimensions and mounting configurations.

• Compatibility with Misalignment:

  Beam couplings are designed to handle misalignment between the shafts. This characteristic provides additional flexibility during installation, as it can compensate for slight positioning errors or misalignment during assembly.

When selecting a beam coupling for your application, ensure that the chosen coupling size matches the shaft diameters within the specified range. Also, consider the mounting method that best suits your setup, whether it’s clamp-style or set screw-type. For applications with specific requirements, such as adapting between different shaft sizes, explore options with step bores or adapters or inquire about custom solutions from coupling manufacturers.

Overall, the ability of beam couplings to accommodate different shaft diameters and mounting configurations makes them a versatile and widely-used choice in motion control systems across various industries.

Considerations for Using Beam Couplings in High-Speed Applications

When using beam couplings in high-speed applications, several specific considerations are essential to ensure optimal performance, safety, and reliability. High-speed operation introduces additional challenges that need to be addressed to maximize the benefits of beam couplings. Here are the key considerations:

• 1. Balance and Runout:

  Ensure that the beam coupling and connected components are well-balanced and have minimal runout. Imbalanced couplings can cause vibration and resonance at high speeds, leading to reduced precision and potential damage to the system. Minimizing runout helps maintain smooth and stable operation.

• 2. Material Selection:

  Choose high-quality materials for the beam coupling that can withstand the forces and stresses experienced during high-speed operation. High-strength alloys, such as stainless steel or aluminum, are commonly used for beam couplings in high-speed applications due to their excellent mechanical properties and fatigue resistance.

• 3. Torsional Rigidity:

  Consider the required torsional rigidity for your specific high-speed application. While beam couplings offer good torsional rigidity, extremely high-speed applications might demand specialized couplings with even higher rigidity to ensure accurate torque transmission and minimize torsional deformation.

• 4. Critical Speed:

  Be aware of the critical speed of the beam coupling, which is the rotational speed at which the coupling’s natural frequency coincides with the operating speed. At critical speed, the coupling can experience excessive vibration and become susceptible to resonance, leading to potential failure. Operating below the critical speed is essential to avoid such issues.

• 5. Lubrication:

  For high-speed applications, proper lubrication of the beam coupling is crucial to reduce friction, wear, and heat generation. Lubrication also helps dissipate any generated heat, maintaining the coupling’s integrity during prolonged operation.

• 6. Cooling:

  In applications with extended high-speed operation, consider implementing cooling mechanisms to prevent overheating of the beam coupling. Excessive heat can affect the material properties and lead to premature wear or failure.

• 7. Dynamic Balancing:

  For high-speed systems, it is essential to dynamically balance the rotating components, including the beam coupling, to minimize vibration and prevent potential damage to the system and surrounding equipment.

• 8. Regular Inspection and Maintenance:

  Perform regular inspections and maintenance to detect any signs of wear, fatigue, or misalignment in the beam coupling. Addressing issues promptly can prevent unexpected failures and costly downtime.

By carefully considering these factors and ensuring proper selection, installation, and maintenance of beam couplings in high-speed applications, you can enhance performance, extend the life of the coupling, and promote safe and reliable operation in your motion control system.

editor by CX 2024-02-21