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 are the Maintenance Requirements for Bellows Couplings to Ensure Reliable Performance?

Proper maintenance of bellows couplings is essential to ensure their reliable performance and extend their service life. Here are some maintenance requirements and practices for bellows couplings:

• Regular Inspection: Perform routine inspections of the bellows coupling to check for any signs of wear, damage, or misalignment. Look for cracks, tears, or deformation in the bellows element, as these issues can lead to coupling failure.
• Lubrication: In most cases, bellows couplings do not require lubrication. However, some specific applications or coupling designs may benefit from periodic lubrication of the shafts. Always follow the manufacturer’s guidelines regarding lubrication, as using the wrong type of lubricant can damage the coupling.
• Keep the Coupling Clean: Ensure that the bellows coupling and its surroundings are clean and free from debris. Dirt, dust, and foreign particles can accelerate wear and reduce the coupling’s performance.
• Avoid Overloading: Do not exceed the maximum torque and speed limits specified by the manufacturer. Overloading the coupling can cause premature failure and compromise the system’s performance.
• Address Misalignment and Shaft Movement: If misalignment or shaft movement occurs during operation, identify and correct the root cause promptly. Excessive misalignment or axial motion can put extra stress on the bellows and lead to premature failure.
• Inspect Fasteners: Check and tighten the fasteners, such as set screws or clamping screws, that secure the coupling to the shafts. Loose fasteners can cause the coupling to slip or shift, affecting its performance.
• Replace Damaged Couplings: If any signs of damage or wear are detected during inspection, replace the bellows coupling with a new one. Continuing to use a damaged coupling can result in catastrophic failure and potential damage to connected machinery.
• Follow Manufacturer’s Guidelines: Always follow the maintenance instructions provided by the coupling manufacturer. They may have specific recommendations for inspection intervals, cleaning methods, and other maintenance practices.

By following these maintenance practices, you can ensure that your bellows couplings remain in good condition and deliver reliable performance throughout their operational life. Regular inspections and proactive maintenance help identify potential issues early, allowing you to take corrective actions before they escalate into more significant problems.

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.

What is a Bellows Coupling, and How is it Used in Mechanical Power Transmission?

A bellows coupling is a type of flexible coupling used in mechanical power transmission systems to connect two shafts while allowing for angular misalignment, axial motion, and torsional flexibility. It consists of a thin-walled metallic bellows element that resembles an accordion or bellows, which gives the coupling its name. The bellows is typically made of stainless steel, providing it with the necessary flexibility and durability for various applications.

When used in mechanical power transmission, a bellows coupling accommodates misalignments between the connected shafts. These misalignments can be in the form of angular misalignment, where the shafts are not perfectly aligned in a straight line, or axial misalignment, where there is some linear movement along the shaft axis. Additionally, the bellows element provides torsional flexibility, allowing the coupling to transmit torque while compensating for slight shaft misalignments.

The bellows coupling works by absorbing and redistributing the misalignment forces through the flexing of the bellows element. As the shafts rotate, any misalignment causes the bellows to flex, allowing the coupling to maintain a continuous transmission of torque while reducing stress on the connected shafts. This flexibility also helps dampen vibrations and shock loads, protecting the connected components from excessive wear and fatigue.

One of the significant advantages of using a bellows coupling is its high torsional stiffness. The bellows element provides excellent torsional rigidity, making it suitable for applications where precise motion control and minimal torsional backlash are essential.

Bellows couplings find applications in various industries, including robotics, aerospace, medical devices, semiconductor manufacturing, and precision machinery. They are commonly used in applications where accurate positioning, high torque transmission, and compensating for misalignments are critical requirements.

In summary, a bellows coupling is a flexible and robust coupling solution that allows for angular misalignment, axial motion, and torsional flexibility in mechanical power transmission systems. Its ability to accommodate misalignments while maintaining high torsional stiffness makes it a preferred choice in precision positioning and motion control applications.

editor by CX 2023-12-27