Product Description

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Item No.	φD	L	L1	W	M	Tighten the strength(N.m)
SG7-11-30-	30	50	18.5	13	M3(4)	1.2
SG7-11-40-	40	66	25	16	M4(6)	2.7
SG7-11-55-	55	78	30	18	M5(4)	6
SG7-11-65-	65	90	35	20	M5(6)	6
SG7-11-80-	80	114	45	24	M6(8)	10
SG7-11-95-	95	126	50	26	M8(4)	35
SG7-11-105-	105	140	56	28	M8(4)	35

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Item No.	Rated torque	Maximum Torque	Max Speed	Inertia Moment	N.m rad	Tilting Tolerance	End-play	Weight:(g)
SG7-11-30-	7.4N.m	14.8N.m	20000prm	8.7×10-4kg.m²	510N.m/rad	1.0c	+0.6mm	50
SG7-11-40-	9.5N.m	19N.m	15000prm	1.12×10-3kg.m²	550N.m/rad	1.0c	+0.8mm	120
SG7-11-55-	34N.m	68N.m	13000prm	4.5×10-3kg.m²	1510N.m/rad	1.0c	+0.8mm	280
SG7-11-65-	95N.m	190N.m	10500prm	9.1×10-3kg.m²	2800N.m/rad	1.0c	+0.8mm	450
SG7-11-80-	135N.m	270N.m	8600prm	1.9×10-2kg.m²	3600N.m/rad	1.0c	+1.0mm	960
SG7-11-95-	230N.m	460N.m	7500prm	2.2×10-2kg.m²	4700N.m/rad	1.0c	+1.0mm	2310
SG7-11-105-	380N.m	760N.m	6000prm	3.3×10-2kg.m²	5800N.m/rad	1.0c	+1.0mm	3090

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How does a spider coupling compare to other types of couplings, such as jaw couplings or gear couplings?

Spider couplings, jaw couplings, and gear couplings are all commonly used in mechanical systems for power transmission and misalignment compensation. Each type of coupling has its own unique characteristics and advantages. Here’s a comparison:

• Spider Couplings: Spider couplings, also known as flexible couplings or jaw/spider couplings, use an elastomeric spider to transmit torque and accommodate misalignment. They are known for their flexibility, vibration dampening, and ability to handle angular, radial, and axial misalignment. Spider couplings are suitable for a wide range of applications and are cost-effective solutions for moderate torque requirements and misalignment compensation.
• Jaw Couplings: Jaw couplings consist of two hubs with curved jaws that interlock and transmit torque. They are simple to install and provide a secure connection. However, jaw couplings are less effective in accommodating misalignment compared to spider couplings. They are suitable for applications with minimal misalignment and moderate torque transmission.
• Gear Couplings: Gear couplings use toothed gears to transmit torque between shafts. They are robust and capable of transmitting high torque while accommodating some misalignment. Gear couplings are often used in heavy-duty applications that require precise torque transmission and can tolerate limited misalignment.

When comparing these couplings, spider couplings stand out for their versatility in handling various types of misalignment and providing vibration dampening. Jaw couplings are simpler and suitable for applications with minimal misalignment, while gear couplings excel in heavy-duty applications with high torque requirements. The choice between these couplings depends on the specific requirements of the application, including torque, misalignment compensation, space limitations, and cost considerations.

Can you explain the concept of torsional stiffness in relation to spider couplings?

Torsional stiffness is a crucial concept in the design and functionality of spider couplings. It refers to the ability of a coupling to resist rotational deformation (twisting) when subjected to a torque load. In other words, torsional stiffness measures how much a coupling can maintain its shape and transmit torque without excessive twisting or deformation.

In the context of spider couplings:

• High Torsional Stiffness: A coupling with high torsional stiffness exhibits minimal angular deflection or twisting when torque is applied. This ensures accurate torque transmission and precise alignment between connected shafts. High torsional stiffness is especially important in applications that require accurate positioning and synchronization.
• Low Torsional Stiffness: A coupling with low torsional stiffness allows for some degree of angular misalignment between shafts and can accommodate slight variations in torque load. This flexibility can be advantageous in applications where misalignment or shock absorption is necessary.

When selecting a spider coupling for a specific application, the torsional stiffness of the coupling needs to be considered based on the requirements of the machinery system. The choice between high and low torsional stiffness depends on factors such as the level of precision needed, the type of load, the degree of misalignment, and the overall performance objectives.

It’s important to note that while torsional stiffness is a key consideration, other factors like the material of the elastomeric spider, size of the coupling, and the type of spider profile also play a role in the coupling’s overall performance and behavior.

What is a spider coupling and how is it used in mechanical systems?

A spider coupling, also known as a jaw coupling or elastomeric coupling, is a type of flexible coupling used to connect two shafts while accommodating misalignment and transmitting torque between them. It consists of three main components: two hubs and an elastomeric spider or insert that fits between them.

The elastomeric spider is typically made of a flexible and durable material, such as rubber or polyurethane, with a series of lobes or fins that fit into matching grooves on the inner surfaces of the hubs. These lobes allow the spider to flex and absorb misalignments between the connected shafts while transmitting torque.

The spider coupling is used in mechanical systems to:

• Transmit Torque: The primary function of a spider coupling is to transmit torque from one shaft to another. As the shafts rotate, the elastomeric spider deforms slightly, allowing the hubs to move relative to each other while maintaining torque transmission.
• Accommodate Misalignment: Spider couplings can accommodate different types of misalignment, including angular, axial, and parallel misalignments, without causing excessive stress on the connected components. This flexibility helps prevent premature wear and failure.
• Dampen Vibrations: The elastomeric material of the spider acts as a shock absorber, dampening vibrations and reducing the transmission of vibrations between the connected shafts. This can improve overall system performance and reduce wear on components.
• Isolate Shock Loads: In applications with sudden changes in torque or shock loads, the spider coupling can absorb and dampen these shocks, protecting the connected components from damage.
• Reduce Maintenance: Spider couplings require minimal maintenance due to their simple design and absence of lubrication points. This can lead to reduced downtime and maintenance costs in industrial machinery.
• Provide Electric Insulation: Spider couplings can provide electrical isolation between the connected shafts, making them suitable for applications where electrical grounding needs to be minimized.

Spider couplings are commonly used in various machinery and equipment, such as pumps, compressors, conveyors, fans, and industrial machinery. They are particularly well-suited for applications that require flexibility, misalignment compensation, vibration reduction, and ease of maintenance.

editor by CX 2024-02-06