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Flexible Couplings
Flexible couplings are mechanical devices that connect two shafts together while allowing a certain degree of misalignment, axial movement, or torsional vibration between them. They are designed to transmit torque from one shaft to another while compensating for any misalignment or occurring movement. Flexible couplings typically comprise two hubs or flanges, one attached to each shaft and a flexible element in between. The flexible element can be made of various materials, such as elastomers (rubber), metals (steel), or a combination of both. The material choice depends on the specific application and the coupling’s desired properties.
What is the Primary Function of a Flexible Coupler? What Causes Misalignments?
The primary purpose of a flexible coupler is to transmit power and rotational motion between two shafts while minimising misalignment effects. Misalignment can occur due to various factors, such as thermal expansion, manufacturing tolerances, or external forces acting on the system.
What is a Mechanical Coupling or Coupler?
A Coupling, or coupler, is a mechanical device designed for power transmission by connecting two rotating shafts together. Couplers can be rigid or flexible couplers widely used in motor control applications, including vehicles, machinery, and other mechanical systems.
The Difference Between Rigid and Flexible Coupling:
Rigid and flexible coupling differ based on their functions and adhered properties. Rigid couplings are used for precise alignments, requiring no movement between the rigid coupler and the shaft. On the other hand, flexible couplings provide a certain degree of flexibility in motion and misalignment between shaft couplers.
Potential Benefits of Flexible Couplings
Flexible couplings offer several benefits in various mechanical systems. Some key advantages of using flexible couplings include:
- They are highly flexible.
- They provide misalignment compensation, improving performance and durability.
- Shock absorption and reduced vibrations.
- Transmit torque between shafts, ensuring reliable power transmission.
- Flexible couplings possess sufficient torsional stiffness for accurate torque transmission.
- Easy to install with minimal maintenance requirements.
- Compact and lightweight.
- Durable and versatile with a long lifespan.
Types of Flexible Couplings:
There are several types of flexible couplings available, including:
- Gear Couplings – These couplings use gear teeth to transmit torque between the shafts, accommodating high torque and misalignment.
- Jaw Couplings – Jaw couplers comprise two hubs with curved jaws and an elastomeric insert. They provide a simple and economical solution for transmitting torque while allowing angular misalignment.
- Oldham Couplings – Oldham couplings use three discs, with two external discs connected to the shafts and a middle disc serving as a connecting element. Oldham couplers significantly compensate for parallel misalignment but have limited angular misalignment capacity.
- Bellow Couplings – These couplings can accommodate various misalignment forms while maintaining a balanced design that minimises vibration during high-speed operations.
- Diaphragm Couplings – Diaphragm couplings are highly flexible and use a series of thin metallic diaphragms to transmit torque. They allow significant misalignment and torsional vibration dampening in various motion control applications.
- Fluid Couplings – Fluid couplings use hydraulic fluid to transmit torque and are used where smooth torque transmission is required without shock loads.
- Disc Couplings – Disc couplings integrate a series of thin metallic discs stacked alternately, ensuring high torque transmission and misalignment compensation.
Best Flexible Couplings Available at Enrgtech:
Enrgtech carries extensive collections of branded flexible couplings, such as Huco couplings, KTR couplings, Omron couplings, and more. We offer these mechanical couplings, rubber couplings, tyre couplings, and specialist couplings at the best possible prices and speedy delivery services worldwide. Visit our website to discover other power transmission couplings available in bulk.
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KUP-0610-B, Sick
Flexible Encoder Coupling
Flexible bellows type coupling from Sick. Designed for use within the Sick Stegmann Programmable Incremetal Decoder.
SICK STEGMANN Programmable Incremental Encoders
The DRS61 programmable incremental encoder may be programmed to produce any PPR from 1 to 8192. The programming tool is quick and easy to use. Consisting of a USB lead and Windows 98/2000/XP compatible software, you can programme the encoder in seconds. For those users utilising the zero/marker pulse the DRS61 offers a further benefit. At the push of a button the zero/marker pulse can be aligned precisely with the mechanical zero of your machine.
Freely programmable PPR from 1 to 8192
Solid shaft or hollow shaft design
Electronic adjustment of zero/marker pulse
Sealed to IP65 (with mating connector fitted)
Interchangeable with most competitor products
Temperature range: -20 to +85°C
Note
Software and leads available separately
New items
047.10.1818.RS, Huco
Double Loop Couplings
Flexible couplings suitable for the correction of radial, angular and axial misalignment. The hubs manufactured from a zinc plated steel alloy with a passivated coating for improved corrosion resistance and connected with a Hytrel polyester elastomer flex element giving excellent strength and heat and chemical resistance. Easy to install set screw fitting and suitable up to speeds of 3000 RPM.
Huco Double Loop Couplings
New items
047.30.4242.RS, Huco
Double Loop Couplings
Flexible couplings suitable for the correction of radial, angular and axial misalignment. The hubs manufactured from a zinc plated steel alloy with a passivated coating for improved corrosion resistance and connected with a Hytrel polyester elastomer flex element giving excellent strength and heat and chemical resistance. Easy to install set screw fitting and suitable up to speeds of 3000 RPM.
Huco Double Loop Couplings
New items
FCMR38-12-12-SS, Ruland
Stainless Steel Flexible Shaft Couplings
Designed to perform where higher speeds, greater misalignment, and limited lubrication would exceed the capabilities of other couplings. Each coupling is manufactured as one piece, thereby eliminating mechanical joints and possible failure points.Two fixing styles available:,Typical applications include encoders, stepper motors, robotics, measuring instruments, servo systems, pumps, valves, fans etc., (i) Set Screw style is secured using one grub-screw per shaft (staggered at 120°) , (ii) Clamp style fixing uses one socket head cap screw per shaft.
Constant velocity couplings with high torque capacity and zero backlash
Torsionally rigid one-piece construction
Not temperature sensitive
High or low speed operation and reversible
No lubrication required
Up to 3° of axial misalignment allowable
Note
The coupling shown represents the clamp style fixing
New items
FCMR19-5-5-A, Ruland
Aluminium Flexible Shaft Couplings
Designed to perform where higher speeds, greater misalignment, and limited lubrication would exceed the capabilities of other couplings. Each coupling is manufactured as one piece, thereby eliminating mechanical joints and possible failure points.Two fixing styles available:,Typical applications include encoders, stepper motors, robotics, measuring instruments, servo systems, pumps, valves, fans etc., (i) Set Screw style is secured using one grub-screw per shaft (staggered at 120°) , (ii) Clamp style fixing uses one socket head cap screw per shaft.
Constant velocity couplings with high torque capacity and zero backlash
Torsionally rigid one-piece construction
Not temperature sensitive
High or low speed operation and reversible
No lubrication required
Up to 3° of axial misalignment allowable
Note
The coupling illustrated shows the Clamp style fixing.
New items
VIVA-V125-HUB-T/L, Rexnord
Rexnord Viva Elastomer Coupling
This elastomeric coupling range from Rexnord is low maintenance requiring no lubrication. The soft polymer element is able to cope with, and correct for considerable mis-alignment. Two piece polymer element allow's for quick removal and replacement without the need to disturb the hubs, shaft or remove equipment from its mountings.
Polyurethane element cushions connected components from vibration and shock. Suitable for a diverse range of applications including centrifugal compressors and blowers, metal extruders, cooling towers, reciprocating pumps and forced draft fans. ATEX approved.
One complete coupling requires the purchase of two hubs and a polymer connecting element.
Built in Overload Protection
Close Coupled and Spacer Versions Available to Allow for Different Shaft Spacings
For Applications up to 7,500 rpm
Low Maintenance
ATEX
Elastomer Couplings
New items
PSMR25-10-10-A, Ruland
Aluminium Flexible Shaft Couplings
Designed to perform where higher speeds, greater misalignment, and limited lubrication would exceed the capabilities of other couplings. Each coupling is manufactured as one piece, thereby eliminating mechanical joints and possible failure points.Two fixing styles available:,Typical applications include encoders, stepper motors, robotics, measuring instruments, servo systems, pumps, valves, fans etc., (i) Set Screw style is secured using one grub-screw per shaft (staggered at 120°) , (ii) Clamp style fixing uses one socket head cap screw per shaft.
Constant velocity couplings with high torque capacity and zero backlash
Torsionally rigid one-piece construction
Not temperature sensitive
High or low speed operation and reversible
No lubrication required
Up to 3° of axial misalignment allowable
Note
The coupling illustrated shows the Clamp style fixing.
New items
PHE 35GCRSB, SKF
The SKF gear coupling is a very high-torque ratings, along with unparalleled bore capacities, give this coupling a great advantage over other types of couplings. The gear coupling are rated up to 1 310 kNm with a maximum bore of 525 mm. This is a heavy duty coupling with incredible design flexibility, making it an economical choice for many applications. The unique design of the gear coupling tooth crowning dramatically reduces backlash and radial clearance. The hub bore capacities are the largest in the industry, allowing for low cost and long service life.
Use of alloy steel, heat-treated, to improve capacity by between 35–40%
Size 15GC
New items
530.34.3535, Huco
Stainless Steel Bellows Couplings - Set Screw Type
High torsional stiffness for positional accuracy
Low inertia
Ideal for servo drive applications with high precision dynamic position control
Material: Aluminium hub; stainless steel bellows
New items
530.26.2222, Huco
Stainless Steel Bellows Couplings - Set Screw Type
High torsional stiffness for positional accuracy
Low inertia
Ideal for servo drive applications with high precision dynamic position control
Material: Aluminium hub; stainless steel bellows
New items
452H50.52, Huco
Oldham Style Couplings - Clamp Style
Clamp style couplings for use with heavy power transmission at moderate speeds.
Huco Oldham Style Couplings
Backlash-free
Can handle large radial shaft misalignment
Constant low bearing side loads
Electrically isolating
Note
Not sold as an assembled unit. Customer needs to purchase 2x hubs and 1x torque disc.
New items
BOWEXM24-HUB-PB, KTR
Bowex M Tooth Gear Coupling Hub
BoWex® Curved-tooth gear couplings® are flexible shaft connections for a positive torque transmission and used to compensate for axial, radial and angular shaft misalignment. Using curved-tooth gear couplings® avoids any edge pressure in the spline plus angular and radial displacements are avoided so that BoWex® couplings are almost free from wear.
The material combination of steel hubs and polyamide sleeves allows for maintenance free continuous operation with low friction on the teeth. While any metallic materials tend to "corrode" in case of dry running, slide combinations with polyamide and steel are operative without any lubrication or maintenance.
Due to the double cardanic operation of BoWex® couplings, restoring forces can be neglected in case of angular and radial displacements. Periodic fluctuations in angular velocity do not arise.
BoWex® couplings can be assembled both vertically or horizontally with no need for any special assembly tools.
The smooth and hard surface plus the high thermal stability and resistance to lubricants, fuels, hydraulic fluids, dissolvents, and so on, make polyamide an ideal material for components stressed by sliding, particularly for the coupling production.
Features and Benefits
Double cardanic curved-tooth gear coupling®
For all applications in the range of machinery and hydraulics
Maintenance free due to material combination nylon/steel
Taper and inch bores for hydraulic pumps
100° maximum operating temperature
Absorbs axial, angular and radial misalignment
Torsionally rigid
Short shaft distance
Product Application Information
Food industry, print and paper industry, textile industry, sewage technology, wash-mobiles, chemical and pharmaceutical, offshore units, and so on. For use in aggressive environments (air, water, chemicals, and so on).
Note
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