Product Description

Item No.	φD	L	W	L1	M	Tighten the strength(N.m)
SG7-8-C19-	19.5	20	1.2	9.4	M2.5	1
SG7-8-C26-	26	25.5	2.5	11.5	M3	1.5
SG7-8-C34-	34	32.3	3.3	14.5	M4	1.5
SG7-8-C39-	39	34.1	4.1	15	M4	2.5
SG7-8-C44-	44	34.5	4.5	15	M4	2.5
SG7-8-C50-	50	40.5	4.5	18	M5	7
SG7-8-C56-	56	45	5	20	M5	7
SG7-8-C68-	68	54	6	24	M6	12
SG7-8-C82-	82	68	8	30	M8	16
SG7-8-C94-	94	68	8	30	M8	28
SG7-8-C104-	104	70	10	30	M8	28

Item No.	Rated torque	Maximum Torque	Max Speed	Inertia Moment	N.m rad	RRO	Tilting Tolerance	End-play	Weight:(g)
SG7-8-C19-	1N.m	2N.m	10000prm	0.65×10-6kg.m²	200N.m/rad	0.04mm	1c	±0.2mm	12
SG7-8-C26-	1.4N.m	2.8N.m	10000prm	1.8×10-6kg.m²	690N.m/rad	0.04mm	1c	±0.2mm	31
SG7-8-C34-	2.8N.m	5.6N.m	10000prm	7.2×10-6kg.m²	1650N.m/rad	0.04mm	1c	±0.2mm	64
SG7-8-C39-	5.8N.m	11.6N.m	10000prm	1.8×10-5kg.m²	2500N.m/rad	0.04mm	1c	±0.2mm	97
SG7-8-C44-	8.7N.m	17.4N.m	10000prm	2.5×10-5kg.m²	2900N.m/rad	0.04mm	1c	±0.2mm	113
SG7-8-C50-	15N.m	30N.m	10000prm	8.2×10-5kg.m²	6700N.m/rad	0.04mm	1c	±0.2mm	195
SG7-8-C56-	25N.m	50N.m	10000prm	1×10-4kg.m²	8400N.m/rad	0.04mm	1c	±0.2mm	263
SG7-8-C68-	55N.m	110N.m	10000prm	1.9×10-4kg.m²	11500N.m/rad	0.04mm	1c	±0.2mm	445
SG7-8-C82-	80N.m	160N.m	10000prm	7×10-4kg.m²	14550N.m/rad	0.04mm	1c	±0.2mm	892
SG7-8-C94-	185N.m	370N.m	10000prm	1.23×10-3kg.m²	16900N.m/rad	0.04mm	1c	±0.2mm	950
SG7-8-C104-	255N.m	510N.m	10000prm	1.86×10-3kg.m²	25100N.m/rad	0.04mm	1c	±0.2mm	1190

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What are the common installation mistakes to avoid when using flexible couplings?

Proper installation is crucial for the reliable and efficient performance of flexible couplings. Here are some common installation mistakes to avoid:

• Incorrect Alignment: One of the most critical installation errors is improper alignment of the driving and driven shafts. Misalignment can lead to premature wear, increased vibration, and reduced power transmission efficiency. It is essential to align the shafts within the specified tolerances provided by the coupling manufacturer.
• Over-Tightening: Applying excessive torque to the coupling’s fasteners during installation can cause damage to the flexible elements and decrease their ability to accommodate misalignment. It is essential to follow the recommended torque values provided by the coupling manufacturer to ensure proper clamping without over-tightening.
• Improper Lubrication: Some flexible couplings may require lubrication of their flexible elements or moving parts. Failure to lubricate as recommended can lead to increased friction, wear, and reduced service life of the coupling.
• Using Damaged Couplings: Before installation, it is crucial to inspect the flexible coupling for any signs of damage or defects. Using a damaged coupling can lead to premature failure and potential safety hazards. If any damage is detected, the coupling should be replaced with a new one.
• Wrong Coupling Selection: Selecting the wrong type or size of the coupling for the application can result in inadequate performance, premature wear, and possible coupling failure. It’s essential to consider factors such as torque requirements, speed, misalignment compensation, and environmental conditions when choosing the appropriate coupling.
• Ignoring Operating Conditions: Failure to consider the specific operating conditions, such as temperature, humidity, and exposure to corrosive substances, can lead to accelerated wear and reduced coupling lifespan. Choosing a coupling that is compatible with the operating environment is essential.
• Ignoring Manufacturer Guidelines: Each flexible coupling comes with specific installation guidelines provided by the manufacturer. Ignoring these guidelines can lead to suboptimal performance and potential safety issues. It is crucial to carefully follow the manufacturer’s instructions during installation.

By avoiding these common installation mistakes and following best practices, the reliability, efficiency, and service life of flexible couplings can be maximized, leading to improved performance of the mechanical system as a whole.

How does a flexible coupling handle torsional vibrations in rotating machinery?

A flexible coupling is designed to handle torsional vibrations in rotating machinery by providing a degree of flexibility and damping. Torsional vibrations are oscillations that occur in the drivetrain due to torque variations, sudden load changes, or other transient events. These vibrations can lead to resonance, excessive stress, and premature failure of components.

Flexible couplings mitigate torsional vibrations through the following mechanisms:

• Torsional Compliance: Flexible couplings have an element, such as an elastomeric insert, that can deform or twist to absorb torsional shocks. When the drivetrain experiences torsional vibrations, the flexible element flexes, effectively isolating and dampening the vibrations before they propagate further.
• Damping: Many flexible couplings have inherent damping properties, especially those with elastomeric components. Damping dissipates the energy of the torsional vibrations, reducing their amplitude and preventing resonance from occurring.
• Tuned Design: Some flexible couplings are specifically designed with specific torsional characteristics to match the drivetrain’s requirements. By tuning the coupling’s stiffness and damping properties, engineers can ensure optimal torsional vibration control.
• Torsional Stiffness: While flexible couplings provide flexibility to absorb vibrations, they also offer a degree of torsional stiffness to maintain the torque transmission efficiency between the shafts.

It is important to select the appropriate flexible coupling based on the specific torsional characteristics and requirements of the rotating machinery. Different applications may demand different types of couplings with varying levels of flexibility and damping. High-performance flexible couplings can effectively minimize torsional vibrations, protecting the drivetrain and connected equipment from excessive stress and potential damage.

Additionally, proper alignment of the flexible coupling during installation is crucial to ensure its optimal performance in mitigating torsional vibrations. Misalignment can introduce additional stresses and exacerbate torsional issues in the system. Regular inspection and maintenance of the flexible coupling will help identify any signs of wear or damage that may affect its ability to handle torsional vibrations effectively.

Are there any limitations or disadvantages of using flexible couplings?

While flexible couplings offer numerous advantages, they do come with some limitations and disadvantages that should be considered when selecting them for specific applications. Here are some of the common limitations and disadvantages of using flexible couplings:

• Torsional Stiffness: Flexible couplings provide some level of torsional flexibility, which is advantageous in many applications. However, in systems that require high precision and minimal angular deflection, the inherent flexibility of the coupling may not be suitable. In such cases, a rigid coupling may be more appropriate.
• Limitation in High-Torque Applications: While some flexible couplings can handle moderate to high torque levels, they may not be as well-suited for extremely high-torque applications. In such cases, specialized couplings, such as gear couplings, may be required to handle the high torque demands.
• Temperature Limitations: The performance of certain flexible coupling materials, especially elastomers and plastics, may be affected by extreme temperature conditions. High temperatures can lead to premature wear and reduced lifespan of the coupling, while low temperatures may result in reduced flexibility and potential brittleness.
• Chemical Compatibility: Certain flexible coupling materials may not be compatible with certain chemicals or substances present in the application’s environment. Exposure to chemicals can cause degradation or corrosion of the coupling material, affecting its performance and lifespan.
• Installation and Alignment: Flexible couplings require proper installation and alignment to function effectively. If not installed correctly, misalignment issues may persist, leading to premature wear and reduced performance. Aligning the shafts accurately can be time-consuming and may require specialized equipment and expertise.
• Cost: In some cases, flexible couplings may be more expensive than rigid couplings due to their more complex design and use of specialized materials. However, the cost difference is often justified by the benefits they offer in terms of misalignment compensation and vibration damping.
• Service Life: The service life of a flexible coupling can vary depending on the application’s conditions and the quality of the coupling. Regular maintenance and timely replacement of worn or damaged parts are essential to ensure the coupling’s longevity and prevent unexpected failures.

Despite these limitations, flexible couplings remain highly valuable components in a wide range of applications, providing efficient torque transmission and compensating for misalignment. Proper selection, installation, and maintenance can help mitigate many of the disadvantages associated with flexible couplings, ensuring their reliable and long-lasting performance in various mechanical systems.

editor by CX 2024-04-25