Product Description
| Item No. | φD | L | L1 | L2 | L3 | S | M | Tighten the strength(N.m) |
| SG7-10-14- | 15 | 20 | 6 | 6 | 3 | 1 | M3 | 1 |
| SG7-10-25- | 26 | 26 | 8 | 8 | 4 | 1 | M4 | 1.5 |
| SG7-10-30- | 32 | 32 | 10 | 9 | 5 | 1.5 | M4 | 1.7 |
| SG7-10-40- | 40 | 50 | 17 | 12 | 8.5 | 2 | M5 | 4 |
| SG7-10-55- | 56 | 58 | 20 | 14 | 10 | 2 | M5 | 4 |
| SG7-10-65- | 66 | 62 | 21 | 15 | 10.5 | 2.5 | M8 | 15 |
| SG7-10-80- | 82 | 86 | 31 | 18 | 15.5 | 3 | M8 | 15 |
| SG7-10-95- | 98 | 94 | 34 | 20 | 17 | 3 | M8 | 15 |
| SG7-10-108- | 108 | 123 | 46 | 24 | 23 | 3.5 | M8 | 15 |
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| Item No. | Rated torque | Maximum Torque | Max Speed | Inertia Moment | N.m rad | RRO | Tilting Tolerance | End-play | Weight:(g) |
| SG7-10-14- | 1.1N.m | 2.2N.m | 19000prm | 3.9×10-4kg.m² | 45N.m/rad | 0.02mm | 1.0c | +0.6mm | 20 |
| SG7-10-25- | 6.0N.m | 12N.m | 16000prm | 6.8×10kg.m² | 56N.m/rad | 0.02mm | 1.0c | +0.6mm | 25 |
| SG7-10-30- | 6.5N.m | 13N.m | 15000prm | 8.3×10kg.m² | 70N.m/rad | 0.02mm | 1.0c | +0.6mm | 46 |
| SG7-10-40- | 32N.m | 64N.m | 13000prm | 9.3×10kg.m² | 490N.m/rad | 0.02mm | 1.0c | +0.8mm | 135 |
| SG7-10-55- | 46N.m | 92N.m | 10500prm | 3.8×10-3kg.m² | 1470N.m/rad | 0.02mm | 1.0c | +0.8mm | 300 |
| SG7-10-65- | 109N.m | 218N.m | 8300prm | 8×10kg.m² | 2700N.m/rad | 0.02mm | 1.0c | +0.8mm | 570 |
| SG7-10-80- | 135N.m | 270N.m | 7000prm | 1.5×10-2kg.m² | 3100N.m/rad | 0.02mm | 1.0c | +1.0mm | 910 |
| SG7-10-95- | 260N.m | 520N.m | 6000prm | 1.9×10kg.m² | 4400N.m/rad | 0.02mm | 1.0c | +1.0mm | 1530 |
| SG7-10-108- | 430N.m | 860N.m | 5000prm | 3×10kg.m² | 5700N.m/rad | 0.02mm | 1.0c | +1.0mm | 2200 |
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Differences between Elastomer and Metallic Jaw Coupling Designs
Jaw couplings are available in two primary designs: elastomer jaw couplings and metallic jaw couplings. Each design has its own set of characteristics and advantages:
- Elastomer Jaw Couplings: Elastomer jaw couplings, also known as flexible jaw couplings, feature an elastomeric spider element that sits between the two hubs. This spider element is typically made of materials like polyurethane, rubber, or other flexible polymers. The elastomeric material provides the coupling with flexibility, allowing it to compensate for shaft misalignment, angular, parallel, and axial, as well as dampen vibrations and shocks. Elastomer jaw couplings are popular for their ability to protect connected equipment from mechanical stresses and enhance overall system performance. They are commonly used in applications where some misalignment is expected or in systems with shock loads and vibrations. Additionally, elastomer jaw couplings are known for their relatively lower cost compared to metallic designs.
- Metallic Jaw Couplings: Metallic jaw couplings, also known as rigid jaw couplings, are constructed entirely from metal, usually steel or aluminum. Unlike elastomer couplings, metallic jaw couplings do not have an elastomeric spider element and offer a more rigid connection between the two hubs. As a result, they are less forgiving of misalignment and do not provide the same level of vibration dampening as elastomer couplings. However, metallic jaw couplings offer higher torque capacity and are better suited for applications where precise shaft alignment is critical. They are commonly used in systems that require high torque transmission and minimal torsional flexibility. Additionally, metallic jaw couplings are well-suited for environments with high temperatures or exposure to chemicals, as they can withstand harsher conditions compared to elastomer designs.
The choice between elastomer and metallic jaw couplings depends on the specific requirements of the application. If flexibility, misalignment compensation, and vibration dampening are crucial, elastomer jaw couplings are preferred. On the other hand, when high torque transmission, precise alignment, and durability in challenging environments are needed, metallic jaw couplings are the better option.
How does a jaw coupling deal with backlash and torsional stiffness?
A jaw coupling addresses backlash and torsional stiffness through its unique design features and choice of materials. Backlash is the amount of free play or clearance between the coupling components, while torsional stiffness refers to the resistance of the coupling to torsional or twisting forces. Here’s how a jaw coupling deals with these aspects:
- Backlash: Jaw couplings are designed to minimize backlash by ensuring a close fit between the elastomer spider and the jaws of the coupling hubs. The elastomer spider acts as a flexible intermediary that fills the space between the mating jaws, reducing any free play between them. This close fit reduces backlash and provides a more precise and responsive power transmission, especially in reversing or intermittent motion applications.
- Torsional Stiffness: Torsional stiffness is achieved in jaw couplings by using materials that provide a balance between flexibility and rigidity. The elastomer spider in the coupling offers some flexibility, allowing it to absorb vibrations and dampen shocks. However, to ensure adequate torsional stiffness, the coupling hubs are usually made from sturdier materials like steel or aluminum. The choice of elastomer material and its geometry also influences the torsional stiffness of the coupling. Some applications may require coupling designs with higher torsional stiffness to maintain the accuracy and stability of the system, while others may benefit from more flexible couplings that can accommodate misalignments and shock loads. Overall, the combination of the elastomer’s flexibility and the coupling hub’s rigidity results in a coupling with a balanced torsional stiffness that can meet the specific needs of the application.
In summary, a jaw coupling minimizes backlash by providing a close fit between the coupling components, and it achieves torsional stiffness by using a combination of flexible elastomer materials and rigid coupling hubs. These design considerations make jaw couplings suitable for a wide range of applications that require reliable power transmission, precise motion control, and the ability to handle misalignments and shocks.
Use of Jaw Couplings in Horizontal and Vertical Shaft Arrangements
Jaw couplings are versatile and can be used in both horizontal and vertical shaft arrangements. Their flexible and misalignment-absorbing design makes them suitable for various applications in different orientations.
Horizontal Shaft Arrangements: In horizontal shaft arrangements, the shafts are positioned parallel to the ground. Jaw couplings are commonly employed in this configuration to connect two shafts, such as those found in motor-driven systems, conveyor belts, and pumps.
Vertical Shaft Arrangements: In vertical shaft arrangements, the shafts are positioned perpendicular to the ground, one above the other. Jaw couplings can also be used in this setup to transmit power between the two vertically aligned shafts. Examples of applications with vertical shaft arrangements include some types of gearboxes, vertical pumps, and certain types of compressors.
It’s important to note that when using jaw couplings in vertical shaft arrangements, the weight of the connected equipment can impose axial loads on the coupling. In such cases, the coupling should be selected to handle both the radial and axial loads to ensure reliable performance.
Whether in horizontal or vertical arrangements, jaw couplings provide a cost-effective and efficient method of power transmission while accommodating misalignment and reducing shock loads. However, it is essential to consider the specific application’s requirements and select the appropriate size and type of jaw coupling for optimal performance and longevity.
editor by CX 2024-05-10