Product Description

Item No. φD L L1 L2 M Tighten the strength(N.m)
SG7-6-40- 40 55 19 24 M3 3
SG7-6-55- 55 65 22 31 M4 6
SG7-6-65- 65 76 27 37 M5 8
SG7-6-82- 82 88 32 41 M6 10
SG7-6-90- 90 88 32 41 M6 12

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Item No. Rated torque Maximum Torque Max Speed Inertia Moment N.m rad RRO Tilting Tolerance End-play Weight:(g)
SG7-6-40- 13N.m 26N.m 8000prm 9×10-5kg.m² 15×103N.m/rad 0.15mm 2c 1mm 231
SG7-6-55- 28N.m 56N.m 6000prm 2.9×10-4kg.m² 28×103N.m/rad 0.2mm 2c 1.5mm 485
SG7-6-65- 60N.m 120N.m 5000prm 4.6×10-4kg.m² 55×103N.m/rad 0.25mm 2c 1.5mm 787
SG7-6-82- 150N.m 300N.m 4500prm 1.1×10-3kg.m² 110×103N.m/rad 0.28mm 2c 1.5mm 1512
SG7-6-90- 200N.m 400N.m 4000prm 2×10-3kg.m² 140×103N.m/rad 0.3mm 2c 1.5mm 1800

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bellows coupling

What Materials Are Commonly Used in Manufacturing Bellows Couplings?

Bellows couplings are manufactured using a variety of materials to suit different application requirements. The choice of material depends on factors such as the operating environment, torque and speed requirements, and the presence of any corrosive or aggressive substances. Some commonly used materials in manufacturing bellows couplings include:

  • Stainless Steel: Stainless steel is a popular choice for bellows couplings due to its excellent corrosion resistance and high strength. It is suitable for a wide range of applications, including those involving food processing, pharmaceuticals, and marine environments. Stainless steel bellows couplings are durable and can withstand harsh conditions.
  • Aluminum: Aluminum is known for its lightweight properties, making aluminum bellows couplings ideal for applications where reducing the overall weight is crucial. While not as corrosion-resistant as stainless steel, aluminum couplings are still suitable for many industrial settings and are often used in robotics, automation, and aerospace industries.
  • Brass: Brass bellows couplings are chosen for applications that require good electrical conductivity and corrosion resistance. They are commonly used in electrical and electronic equipment, as well as in environments where brass is a preferred material for specific compatibility reasons.
  • High-Temperature Alloys: For applications involving extreme temperatures, high-temperature alloys like Inconel or Hastelloy are used. These materials can withstand elevated temperatures while maintaining their mechanical properties, making them suitable for applications in the aerospace and automotive industries.
  • Titanium: Titanium bellows couplings are used in applications requiring a combination of high strength, low weight, and excellent corrosion resistance. They are commonly found in aerospace, marine, and medical equipment where the coupling needs to endure aggressive environments.

The specific material chosen for a bellows coupling depends on the operating conditions, budget constraints, and performance requirements of the application. It’s essential to select a material that can withstand the demands of the environment while ensuring reliable and efficient power transmission in the system.

bellows coupling

What are the Standard Sizes and Dimensions Available for Bellows Couplings?

Bellows couplings come in a variety of standard sizes and dimensions to accommodate different shaft diameters and application requirements. The sizes and dimensions of bellows couplings can vary depending on the manufacturer and specific series of the coupling. However, some common standard sizes and dimensions are as follows:

  • Shaft Diameter: Bellows couplings are available in a range of shaft diameters, typically starting from a few millimeters up to several inches. Common sizes include 6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, 30mm, and larger.
  • Length: The overall length of a bellows coupling can vary based on the design and intended application. Standard lengths are usually specified by the manufacturer and can range from around 20mm to over 100mm, with longer versions available for certain applications.
  • Outer Diameter: The outer diameter of a bellows coupling is determined by the coupling’s construction and can vary across different models. It is essential to consider the available space and installation requirements when choosing a bellows coupling based on its outer diameter.
  • Maximum Torque Rating: Each bellows coupling has a maximum torque rating that defines the maximum amount of torque it can transmit without failure. The torque rating is typically specified in Newton-meters (Nm) or pound-inches (lb-in) and varies between different sizes and materials.
  • Maximum Speed Rating: Bellows couplings are rated for a maximum rotational speed, usually expressed in revolutions per minute (RPM). The speed rating is an important consideration for high-speed applications to avoid exceeding the coupling’s critical speed or causing undue stress on the components.
  • Material: Bellows couplings can be made from various materials, including stainless steel, aluminum, and other alloys. The choice of material depends on factors such as the application’s requirements, environmental conditions, and the need for corrosion resistance.

It’s important to note that these dimensions and specifications may vary depending on the manufacturer and the specific series or model of the bellows coupling. When selecting a bellows coupling, it is crucial to consider the mechanical and performance requirements of the application to ensure proper fit and optimal performance.

bellows coupling

How do Bellows Couplings Accommodate Misalignment and Axial Motion between Shafts?

Bellows couplings are designed to accommodate misalignment and axial motion between shafts while maintaining accurate torque transmission. The key features that enable this flexibility are the bellows element and the coupling’s construction.

1. Bellows Element: The bellows element is a thin-walled, corrugated metal tube with deep convolutions. When torque is applied to the coupling, the bellows element flexes, allowing for angular misalignment between the driving and driven shafts. The corrugations in the bellows provide the necessary flexibility while maintaining the overall structural integrity of the coupling.

2. Axial Motion Compensation: Bellows couplings can also accommodate axial motion between shafts. When there is axial displacement, the bellows compresses or extends, effectively compensating for the relative movement of the shafts along the axial direction. This feature is particularly beneficial in applications where shafts experience thermal expansion or contraction during operation.

3. Single and Multi-Bellows Designs: Bellows couplings are available in both single and multi-bellows designs. Single-bellows couplings offer greater flexibility and are suitable for applications with relatively low misalignments and axial motion. On the other hand, multi-bellows couplings provide enhanced flexibility and can accommodate higher levels of misalignment and axial motion.

4. Zero Backlash: Bellows couplings are designed to have minimal or zero backlash. Backlash refers to the play or clearance between the coupling’s components. Zero backlash ensures that there is no lost motion when reversing the direction of rotation, making bellows couplings ideal for precision motion control applications.

5. Reducing Side Loads: To ensure optimal performance and longevity, it is essential to minimize side loads on bellows couplings. Excessive side loads can cause premature wear and fatigue in the bellows element, leading to reduced coupling life.

Overall, bellows couplings provide excellent flexibility and compensatory capabilities, making them a preferred choice in applications where misalignment and axial motion are expected. The ability to handle these factors without compromising torque transmission or introducing backlash makes bellows couplings suitable for various industries, including robotics, automation, aerospace, and semiconductor manufacturing.

China manufacturer Customized Couplings Motor Connector Bellows Flexible Coupling  China manufacturer Customized Couplings Motor Connector Bellows Flexible Coupling
editor by CX 2024-05-17