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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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.

How do Bellows Couplings Compare to Other Coupling Types, such as Flexible or Rigid Couplings?

Bellows couplings offer distinct advantages and characteristics that set them apart from other coupling types, such as flexible and rigid couplings. Here is a comparison of bellows couplings with other coupling types:

• Flexibility: Bellows couplings are a type of flexible coupling. They provide excellent angular and axial misalignment compensation while maintaining a high level of torsional rigidity. This flexibility helps to reduce stress on connected equipment and allows for smooth operation even in misaligned conditions.
• Compensation for Misalignment: Flexible couplings, including bellows couplings, can accommodate both angular and parallel misalignments. They are designed to allow a certain degree of relative movement between shafts, which helps prevent damage to shafts and connected equipment due to misalignment or vibration.
• Compactness: Bellows couplings are compact and lightweight, making them suitable for applications where space is limited. The absence of additional components, such as elastomeric elements found in other flexible couplings, contributes to their compact design.
• Torsional Stiffness: Compared to some other flexible couplings, bellows couplings offer higher torsional stiffness. This characteristic ensures efficient torque transmission and precise motion control, making them suitable for applications demanding high torsional rigidity.
• Backlash: Bellows couplings typically have minimal backlash due to the absence of mechanical play or components that can introduce free movement. This characteristic allows for precise positioning and control in motion systems.
• Electrical Isolation: Unlike rigid couplings, bellows couplings provide electrical isolation between shafts, making them ideal for applications where electrical continuity must be maintained or avoided between the connected components.
• Resonance Damping: Bellows couplings can help dampen vibrations and reduce resonance in rotating equipment. This characteristic contributes to smoother operation and prolongs the life of connected components.

On the other hand, rigid couplings are suitable for applications requiring precise shaft alignment and no flexibility. They provide a solid and direct connection between shafts, ensuring efficient torque transmission without any loss due to misalignment. However, rigid couplings cannot compensate for misalignment and are more prone to stress concentration in case of shaft misalignment or vibrations.

While flexible couplings, including bellows couplings, offer misalignment compensation and flexibility, they may have slightly lower torsional stiffness compared to rigid couplings. However, their ability to handle misalignments and provide damping characteristics often outweigh this consideration in many motion control applications.

In summary, bellows couplings combine flexibility, torsional stiffness, electrical isolation, and vibration damping features, making them a versatile choice for various precision motion control applications.

Can you explain the Working Principle of a Bellows Coupling and its Advantages in Various Industries?

A bellows coupling is a type of flexible coupling that consists of a bellows element, which is a thin-walled, corrugated metal tube. The working principle of a bellows coupling involves utilizing the elasticity and flexibility of the bellows to transmit torque while accommodating misalignments between the driving and driven shafts.

When torque is applied to the coupling, the bellows element flexes and expands or contracts based on the rotational motion of the shafts. This flexing capability allows the coupling to compensate for angular, axial, and parallel misalignments, providing a degree of freedom for both shafts without inducing excessive stress or load on the connected machinery.

Advantages of Bellows Couplings in Various Industries:

• High Misalignment Compensation: Bellows couplings can accommodate higher misalignments compared to other coupling types, making them ideal for applications where precise alignment is challenging or where shafts may experience dynamic misalignments during operation.
• Torsional Stiffness: Some bellows coupling designs offer high torsional stiffness, ensuring efficient torque transmission and maintaining positional accuracy in motion control systems.
• Backlash-Free: Bellows couplings are typically backlash-free, meaning they have minimal play or clearance between the bellows and the coupling hubs. This characteristic is crucial in precision systems where any degree of backlash can lead to positioning errors.
• Vibration Dampening: The flexible nature of the bellows element helps dampen vibrations and shocks, reducing wear and tear on connected components and improving overall system reliability.
• Electrical Isolation: Some bellows coupling designs offer electrical isolation between the shafts, preventing the transmission of electrical currents and providing protection to sensitive electronic equipment.
• Compact Size: Bellows couplings are available in compact designs, making them suitable for applications with limited space, such as robotics, aerospace, and medical devices.
• Temperature and Corrosion Resistance: Depending on the material used, bellows couplings can exhibit excellent resistance to high temperatures and corrosion, making them suitable for harsh environments in industries like oil and gas, chemical, and marine.

Bellows couplings find applications in a wide range of industries, including robotics, automation, aerospace, medical equipment, semiconductor manufacturing, precision machinery, and more. Their ability to handle misalignments, provide backlash-free motion, and offer excellent torsional stiffness makes them a versatile and reliable choice for critical motion control systems.

editor by CX 2024-04-29