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KTR Couplings

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Frequently Asked Questions About Couplings

What is a Rotex Steel Cross Clamp Coupling ?
Steel Cross Clamp Couplings have the same advantages as the standard Rotex Coupling. Rotex Steel Cross Clamp Couplings have a flawless clamping design that is for spline shafts, they are static balanced and appropriate for reversing applications.


More Useful Couplings Information

Basics of Flexible Couplings
Flexible couplings are also known as elastic couplings. These couplings have an elastic section between the ends of the coupling. There are many flexible couplings unique in construction made specific to applications. Flexible couplings are designed to transmit torque while allowing axial, radial, and angular misalignment. Flexible couplings are able to compensate for angular misalignment up to a few degrees and some parallel misalignment.

Setup of Flexible Couplings
As a requirement of proper shaft alignment, flexible couplings should be easy to connect or disconnect. The transfer of power from one shaft to another should not incur any loss. Flexible couplings allow misalignment among two adjacent shafts. The objective is to minimize the remaining misalignment in running operation to maximize the power transmission and to maximize machine runtime while using flexible couplings.

Facts of Flexible Couplings
Flexible couplings will protect machinery from wear and premature breakdown. Flexible couplings have a large role in extending the life of a components attached to the coupling and at the same time, not degrading the performance of the machine. Flexible couplings should have a tight fitting and this is sometimes overlooked which can be critical to machine design quality.

Basics of Flexible Couplings
Flexible couplings or elastic couplings, tend to have an elastic section between the ends of the coupling. Several flexible couplings are unique in construction made specific to applications. Flexible couplings are designed to transmit torque while allowing radial, axial, angular and parallel misalignment up to a few degrees.

More Couplings Information

Function and Design of the Couplings
One of the benefits of a Couplings is that it does not require lubrication and can be used for shaft to shaft and engine flywheel drive applications.

Function and Design of the Couplings
Couplings are available in a variety of standard mounting option to accommodate shafts up to 4.813 inches and a maximum nominal torque of 22,120 lb-in while still accommodating blind assembly.

Function and Design of the Couplings
The symmetrical relationship between the Couplings allows for a variety of accessories to accommodate different shaft distances. Couplings together with the curved jaw, the crowned design reduces edge loading of the rotex spider while compensating for misalignment and providing system dampening.

Recommended Applications for Couplings
For Couplings Rotex GS, Toolflex and Radec NC are three different zero backlash shaft coupling designs for servo drive applications. Depending on the required torsional stiffness of the the complete system, selection from our standard platforms of Couplings allows for optimized coupling performance while utilizing your installation preferences.

Function and Design of the Couplings
Interlocking curved jaws for the Couplings with a variety of standard clamping options accommodates shafts up to 7.875 inches and a maximum nominal torque of 309-750 lb-in while still accommodating blind assembly. As defined by the spider Rotex Couplings are suitable for moderate industrial temperature ranges. Together these features on the Couplings reduce the maintenance required during the life cycle of the Couplings.

Function and Design of the Couplings
For Couplings all hubs are supplied standard with one setscrew. Non standard Couplings bore are available and are to be discussed with a Motion Marketplace representative. Custom solutions can be produced for all custom Couplings requirements.

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Couplings


Economic Impact of Couplings
In tough economic times we see varying levels of impact on Couplings. For many people these times provide many challenges. The high unemployement rate had caused a lot of anxiety with people making purchasing decisions. This is likely to continue into the future.

Economic Impact on Couplings
In tough economic times we see varying levels of impact on Couplings. For many people these times provide many challenges. The high unemployement rate had caused a lot of anxiety with people making purchasing decisions. This is likely to continue into the future.

Facts About Couplings Products
There are so many interesting facts about Couplings products. This website will explore many of the different facets unique to Couplings products. Since the Couplings has been around for so many years, there is a lot of history and information that you should find quite interesting. We want you to be successful in getting everything you want about a Couplings. We will provide links to industry about the Couplings and any companies that handle Couplings products.

Information on Couplings Products
You will want to know certain product information when you are selecting these Couplings products. Be sure to use all of the resources that you can find to pick out the best Couplings available. When you are making the selection for your purchase, be sure to consider all of the important information. You should consider the reputation of the manufacturer, the price, and try to find some reviews or recommendations before you make your Couplings selection.

Manuals for Couplings Products
If you need help using your Couplings you should refer to the manufactures users guide to determine the specifics for your application. Most manufacturers have comprehensive Couplings information from a manual that came with the product or sometimes downloadable pdf files that are available on the internet.

Manufacturers for Couplings Products
There are many different manufacturers for Couplings products. We will offer a list here. If you would like to be on this list, please send us an email. We would love to hear from you. Since there are so many different manufacturers you should do quite a bit of research before you make a purchasing decision. Each manufacturer will have a certain specialty and you will want to match what you are looking for to the company that is best at providing that feature. You will want to know certain specifications when you are selecting these Couplings products. Be sure to use all of the resources you have available to pick out the best Couplings available.

Frequently Asked Questions


Frequently Asked Questions
What type of coupling works best with a solid shaft encoder?
A torsionally rigid, zero backlash, flexible coupling is recommended. For applications requiring high axial movement, spider couplings are an alternative.

What applications require a jaw coupling?
Common applications that employ jaw couplings include power transmission to industrial equipment, such as with pumps, gearboxes, blowers, compressors, conveyors, and mixers.

How do Flexible Couplings transmit Torque ?
Flexible couplings transmit power through the force of friction via discs due to the tightening of reamer bolts and U-nuts. So there will be no sliding or backlash, and lubrication is not necessary.

What are Rotex Couplings ?
Rotex Couplings are designed to transmit torque between drive and driven components via curved jaw hubs and elastometric elements are also known as spiders. The combination of the components provides a dampening and accommodation for misalignments. Rotex Couplings are available in a variety of metals elastomers and mounting configurations to meet your requirements.

What is a Drop-out center Rotex Coupling ?
A Drop-out Rotex Coupling has the same advantages as the standard Rotex Coupling.In accession,Rotex Drop-out center couplings have complete fitting and removal using only 4 fasteners. Maintenance is decreased by not having to move elements, such as a motor.

What is a Rotex Steel Cross Clamp Coupling ?
Steel Cross Clamp Couplings have the same advantages as the standard Rotex Coupling. Rotex Steel Cross Clamp Couplings have a flawless clamping design that is for spline shafts, they are static balanced and appropriate for reversing applications.

What is a Double Flanged Coupling ?
Double Flange Couplings are suitable for heavy machinery. Rotex Double flanged couplings design, allows radial installation without moving elements.

Can couplings be customized?
Yes, couplings can be customized at the factory to fit any requirements that you may need. As well as customization options, there are plain bore couplings available to let the customer bore and fit to their needs.

Are ROTEX GS couplings better than basic ROTEX couplings?
ROTEX GS couplings are better than the basic ROTEX couplings for two reasons. ROTEX GS have much less backlash, and are able to transfer higher torque limits.

Are KTR Couplings explosion-proof?
KTR Couplings are explosion-proof. The ROTEX series are suitable for power transmission in hazardous areas. These couplings are certified and conform to EC standard 94/9/EC (ATEX 95).

What type of jaw couplings does KTR offer?
KTR offers two varieties of jaw couplings. The Basic jaw coupling is the ROTEX series, and the high performance jaw coupling is the ROTEX GS sries.

Does KTR offer a jaw coupling for high heat environments?
Yes, KTR offers a coupling for high heat environments. The spider will be the part that will limit the resistance to high heat. Depending on the spider, ROTEX couplings have a maximum heat range from 302F to 482f. ROTEX GS have a maximum heat range from 150F to 302F

Does KTR offer any zero-backlash couplings?
Yes, KTR offers three types of zero-backlash couplings. ROTEX GS, TOOLFLEX, and RADEX-NC are all zero-backlash.

Are couplings available in metric and standard sizes?
KTR couplings are available in metric and standard sizes. Aside from common sizes, they can be customized with many available options.

What types of misalignment can a jaw coupling correct?
A jaw coupling can correct three types of misalignment's. Axial, Parallel, and angular misalignment. These tolerances differ depending on series and manufacturer of the jaw couplings.

What if I have trouble installing my couplings such as Rotex, BoWex, etc.?
If you have trouble with installation they're instructions available at www.ktr.com.

What is the best attribute of the BoWex Monolastic?
Since the Monolastic is a one piece coupling it accommodates for parallel and angular misalignment's like what could happen to other BoWex couplings.

Which of the BoWex couplings and designs would be ideal for a hydraulic drive system?
The BoWex designs that would be appropriate for this application would be a Monolastic, FLE-PA, and even Elastic.

Which of the BoWex couplings and designs are Corrision-Proof?
Both BoWex Plug-In and Junior M are made of corrosion-proof material.

Are BoWex couplings suitable for misalignments?
Yes. BoWex couplings are flexible shaft connections for a positive torque transmission and specifically suitable to compensate for axial, radial, and angular shaft misalignment.

Where are Rotex couplings made?
They are primarly made in Germany by KTR but also have subsidiaries and distributors across the globe.

What temperatures are the Toolflex couplings suitable for ?
Toolflex bellow couplings are suitable for elevated temperature ranges up to 392 degrees F.

How Does a Coupling Work ?
Not only are couplings and line shafts required to transmit torque from driving to driven elements but they must also compensate for misalignment between two shafts. Precision couplings ensure a backlash and maintenance free transmission of torque throughout their operations unlike standard couplings. This precision coupling is so precise because of the tight tolerances and dimensional accuracy measured in hundredths of a millimeter of the individual precision coupling components. Despite the large variety, precision couplings can be divided into two main groups: torsionally rigid couplings and vibration damping couplings. The torsionally rigid couplings are often used in the X-Y axis of machine tools whereas vibration damping couplings are mainly used in spindle motors or conveyor units.

What is Torsional Rigidity ?
orsional Rigidity describes the rigidity of a coupling when it is subjected to a torsional load. If the torque is to high and the maximum torsional value of the coupling is exceeded, the coupling will no longer be strong enough to transmit the acting rotational force, the unit "torsional rigidity" (Nm/rad) reflects this relation. Each coupling has a permissible angle of twist with most rigid couplings having a maximum angle of twist of less than 0.05 degrees, and vibration damping coupling having a maximum angle of twist of less than 5 degrees. If the admissible angle of twist is not exceeded, the coupling will have an infinite life.

How are Couplings Controlled?
Couplings are controlled by the driving force that it is connected to. A coupling only acts as an extension, transferring torque and speed from one component to another. More often than not a coupling will be connected to some type of driving force whether it is a stepper, brushless, brushed, AC, or servo motor. In turn, the motor is connected to a driver or controller which controls the speed, direction and torque of the motor. While the driver and motor control the speed and direction, the load that is attached to the coupling will work with both the motor and driver to determine how much torque must be outputted to remain at ideal operating parameters.

What are some Hub Shaft Connections ?
The numerous methods of connecting the coupling hub to a shaft are divided into three main categories: form fit, frictional connections, and pre-tensioned form closures. The form-fit connection is connected through a keyway, which means that the torque is transmitted through surface pressure. Form-fit connections are used for drives with uniform loads. A key advantage of this form-fit connection is the easy mounting and dismounting. Frictional connections transmit torque by clamping the hub onto the shaft, oftentimes by fastening a screw. Couplings with frictional connection are primarily used in highly dynamic applications and systems where the torque and direction of rotation often change. From the above two connection types we can form the third pre-tensioned form closure. The pre-tensioned form closure uses key grooves to combine the two connection types.

Do Keyed Shaft Couplings Come Standard ?
Keyed Shaft Couplings are standard in metric and or inch sizes available. All keyed shaft couplings come standard with one setscrew. For a non standard keyway please contact Motion Marketplace.

Evolution of KTR Couplings
KTR adapted the coupling for a variety of different shaft styles and applications. The BoWex® curved-tooth gear coupling was the first invention from KTR, which was a three-part double-cardanic maintenance-free nylon coupling. The coupling used an abrasion-proof material combination of sintered hubs and the nylon sleeve had periods of wear-free use when it was applied. Following this coupling was the Plug-in jaw-type ROTEX® coupling, which was sold at a low price, and consisted of only three components. It also filled the requirement for torsional elasticity and more damping. Later, steel lamina Motor Coupler (RADEX®) and plastic lamina Motor Coupler (LAMEX®) were developed; built for backlash-free, torsionally-stiff driving systems. Since then, the BoWex® FLE-PA, BoWex ELASTIC® HE, ROTEX® GS, CLAMPEX®, and SYNTEX® coupling products were developed to fit recent application requirements.

What Type of Installation are the Disc Couplings Designed for ?
The Radex Disc Couplings are designed for horizontal installation. For Vertical installation the spacer must be radially supported. Please contact Motion Marketplace for further technical information in regards to this matter.

What Do the Standard design of a Disc Coupling Offer ?
The standard design of a Disc Coupling offers a fail-safe, reduced maintenance, zero-backlash, and are torsionally stiff. Single and double cardanic designs are available. These couplings are also approved to EC standard 94/9/EC. Installation instructions are available upon request.

Evolution of KTR Couplings
KTR adapted the coupling for a variety of different shaft styles and applications. The BoWex® curved-tooth gear coupling was the first invention from KTR, which was a three-part double-cardanic maintenance-free nylon coupling. The coupling used an abrasion-proof material combination of sintered hubs and the nylon sleeve had periods of wear-free use when it was applied. Following this coupling was the Plug-in jaw-type ROTEX® coupling, which was sold at a low price, and consisted of only three components. It also filled the requirement for torsional elasticity and more damping. Later, steel lamina Motor Coupler (RADEX®) and plastic lamina Motor Coupler (LAMEX®) were developed; built for backlash-free, torsionally-stiff driving systems. Since then, the BoWex® FLE-PA, BoWex ELASTIC® HE, ROTEX® GS, CLAMPEX®, and SYNTEX® coupling products were developed to fit recent application requirements.

Can a Polynorm Coupling be Customized?
Polynorm couplings can be customized upon request for custom applications. Engineers are readily available to help with technical support and sales related questions as well.

How Many Different Types of Polynorm Couplings does KTR carry ?
The Polynorm coupling comes in six different types. Polynorm AR, Plynorm ADR, Polynorm AZR, Polynorm ADR-BTA, and ADR-SBA. PUR material is now available for all the different types of polynorm couplings.

What is a Polynorm Coupling?
A Polynorm Coupling is a torsionally flexible jaw-type coupling acc. to DIN 740. It has a axial plug in and is maintenance free, fail safe and the polynorm couplings have a max torque equal to 134,000 NM.

What Industries are suitable for Polynorm Couplings?
The Polynorm coupling can be used in almost all types of machinery and is really ideal for the pump idustry.

Does KTR offer mounting guides?
KTR offers a mounting guide for every variation of their couplings, available upon request.

Is Motion Marketplace a stocking distributor for products from KTR Corporation?
Motion Marketplace is an authorized stocking distributor with a cost savings to the customer up to 30% off list prices on all KTR Couplings and components.

CouplingsCouplingsCouplingsCouplingsCouplings

Frequently Asked Questions About Couplings

What is a Rotex Steel Cross Clamp Coupling ?
Steel Cross Clamp Couplings have the same advantages as the standard Rotex Coupling. Rotex Steel Cross Clamp Couplings have a flawless clamping design that is for spline shafts, they are static balanced and appropriate for reversing applications.


More Useful Couplings Information

Basics of Flexible Couplings
Flexible couplings are also known as elastic couplings. These couplings have an elastic section between the ends of the coupling. There are many flexible couplings unique in construction made specific to applications. Flexible couplings are designed to transmit torque while allowing axial, radial, and angular misalignment. Flexible couplings are able to compensate for angular misalignment up to a few degrees and some parallel misalignment.

Setup of Flexible Couplings
As a requirement of proper shaft alignment, flexible couplings should be easy to connect or disconnect. The transfer of power from one shaft to another should not incur any loss. Flexible couplings allow misalignment among two adjacent shafts. The objective is to minimize the remaining misalignment in running operation to maximize the power transmission and to maximize machine runtime while using flexible couplings.

Facts of Flexible Couplings
Flexible couplings will protect machinery from wear and premature breakdown. Flexible couplings have a large role in extending the life of a components attached to the coupling and at the same time, not degrading the performance of the machine. Flexible couplings should have a tight fitting and this is sometimes overlooked which can be critical to machine design quality.

Basics of Flexible Couplings
Flexible couplings or elastic couplings, tend to have an elastic section between the ends of the coupling. Several flexible couplings are unique in construction made specific to applications. Flexible couplings are designed to transmit torque while allowing radial, axial, angular and parallel misalignment up to a few degrees.

More Couplings Information

Function and Design of the Couplings
One of the benefits of a Couplings is that it does not require lubrication and can be used for shaft to shaft and engine flywheel drive applications.

Function and Design of the Couplings
Couplings are available in a variety of standard mounting option to accommodate shafts up to 4.813 inches and a maximum nominal torque of 22,120 lb-in while still accommodating blind assembly.

Function and Design of the Couplings
The symmetrical relationship between the Couplings allows for a variety of accessories to accommodate different shaft distances. Couplings together with the curved jaw, the crowned design reduces edge loading of the rotex spider while compensating for misalignment and providing system dampening.

Recommended Applications for Couplings
For Couplings Rotex GS, Toolflex and Radec NC are three different zero backlash shaft coupling designs for servo drive applications. Depending on the required torsional stiffness of the the complete system, selection from our standard platforms of Couplings allows for optimized coupling performance while utilizing your installation preferences.

Function and Design of the Couplings
Interlocking curved jaws for the Couplings with a variety of standard clamping options accommodates shafts up to 7.875 inches and a maximum nominal torque of 309-750 lb-in while still accommodating blind assembly. As defined by the spider Rotex Couplings are suitable for moderate industrial temperature ranges. Together these features on the Couplings reduce the maintenance required during the life cycle of the Couplings.

Function and Design of the Couplings
For Couplings all hubs are supplied standard with one setscrew. Non standard Couplings bore are available and are to be discussed with a Motion Marketplace representative. Custom solutions can be produced for all custom Couplings requirements.