Choosing the correct coupling for the task at hand is no easy task. It means asking the right questions before specifying a particular style. Choices abound, and more than one coupling type may be suitable for any given application. Here we share with you expert tips and tactics to make it easy.
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Because engineers are creatures of habit, choosing a coupling type is often a matter of having selected that same type for a previous project. However, because not all couplings are created equal, specifying out of familiarity often mismatches equipment needs with coupling capabilities.
2. Determine the best way to mount coupling to shaft.
The method by which a coupling is mounted on the shaft may determine the success or failure of that coupling, regardless of whether it is right for the job. Traditional keys, keyways, and taper bushings work well in unidirectional applications with minimal shock or reversing loads. For reversing loads and shock applications, keyless locking devices are the preferred mounting method because keyless devices are backlash-free.
3. Ask yourself what the coupling should do.
Perhaps most important is to ask oneself, “What should this coupling do?” Further questions: Does it need to transmit high or low torque? Is the application high or low speed? Does it need to be maintenance free? How about backlash free? Are there misalignments between components to be compensated, and by how much? Does the application require the coupling to absorb shock? How crucial is cost? What about weight?
4. Be aware of correct terminology.
Inch-pounds or inch-ounces? It may seem obvious, but the units of the coupling’s torque rating are commonly confused. Getting the spec wrong can cause you to miss the proper coupling choice by more than an order of magnitude. Another area of confusion involves the use of keyways: Keyway couplings are for high torque, not high precision.
5. Watch for under or overrating.
Underrated couplings: Using a coupling with a torque rating insufficient for the application can damage or break the coupling, compromising the desired transmission. Overrated couplings: If a flexible shaft coupling is chosen with a torque rating higher than required, it may be unnecessarily bulky and stiff. Typically, the higher the torque rating of the coupling, the larger and less flexible it is.
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6. Proper installation cannot be over-emphasized.
Selecting the right coupling for an application can be a complex process, but need not be overly time consuming. The best approach is to carefully consider all design criteria. Typically, these include torque, shaft misalignment, stiffness, rpm, inertia, space requirements, and shaft mounting. A coupling that addresses all of these issues will ultimately perform as required in the application.
7. Improper selection means wrong type and wrong size.
The most common mistake that engineers make when specifying couplings and shafts is improper selection, which includes choosing the wrong coupling type and size. Many coupling styles are available in the marketplace, and chances are that more than one type of coupling will work well for a given application. Conversely, there are likely many couplings that will not work well for that same application. Understanding application requirements and balancing those against functional advantages of available couplings will help identify the ideal product.
8. Know the difference between right and wrong.
Ideal coupling selection is one in which the coupling is installed quickly and then forgotten for years and years. It is a coupling that does not fail due to application demands. Nor does it transfer stress or failure to mating components. It does not require scheduled downtime to maintain reliability.
The wrong coupling is the exact opposite and is usually easy to spot. It takes hours or days to install. It requires near perfect, time-consuming alignment practices and requires frequent lubrication through scheduled downtime.
When the wrong coupling fails, it often fails catastrophically, without warning, leading to extended, unplanned, costly downtime. Upon misalignment, the wrong coupling causes premature failure of mating equipment such as bearings, gears, or shafts. Rather than serving as a fuse in the machine, the wrong coupling in an overloaded machine transfers failures to more expensive components such as motors or gearboxes.
9. Beware of inadequate torsional stiffness.
A coupling lacking adequate torsional stiffness can cause resonance and failure. This problem is becoming more common, as machines are increasingly required to rapidly simulate cam profiles, which can introduce torsional vibration to the driveline. Because couplings are almost always the most compliant component in a system, they tend to dictate the natural frequency of the entire drive axis. When this natural frequency is excited, noise, vibration, and ultimately coupling failure result. During the design process, if it becomes apparent that the drive will be required to index multiple times per second, for example, resonant frequency and coupling torsional stiffness need to be examined.
10. Consider supplier sizing methods and shaft assemblies.
It may be tempting to match coupling torque ratings to RMS torque data provided by servo sizing software, but this does not always account for torque spikes that the coupling may receive due to reflected load inertia. To address the issue, many servo coupling manufacturers have programs and formulas of their own which, depending on the coupling design itself, also account for inertia and duty cycle data that is normally already available. These manufacturer-provided sizing methods help ensure that the coupling will have the right torque rating for the application.
As with all mechanical devices, a coupling must match its intended purpose and application parameters, including many different performance factors. However, a design engineer must look beyond these criteria and also address issues such as the application environment, serviceability, maintenance, and speed of replacement if required — as downtime can seriously degrade many processes. A common pitfall: not understanding what a manufacturer’s product specifications actually mean. For example, axial load data is sometimes determined under ideal (unrealistic) conditions, and sometimes expresses a “failure mode.” Designers must fully understand these specifications as well as design criteria for the machine under review.
Another common mistake in design selection is misidentifying the type and degree of application or system misalignment. Is the misalignment angular or parallel? Is there axial motion? Do all three conditions exist, and to what degree for each? Proper coupling selection cannot be correctly made without a complete understanding of the misalignment being addressed in the system.
Coupling is the device that is used for the connection of shafts to transmit power and torque.
Coupling is the connection of shaft units that are manufactured separately.
Coupling failure occurs due to key and bolts. So it can be covered by flanges to avoid failure.
The shafts may have all-direction axes.
Couplings are used for variable-type applications.
Examples:
Motor and generator
Motor and pump
Flexible Couplings Definition:
Flexible couplings are the coupling device used for the flexible connection.
It is the type of coupling used to join shafts having misalignment in lateral or angular directions.
It has flexible connection allowing the misalignments.
The elements used have the capacity to absorb the shock loads and the vibrations.
Bushed pin type Coupling
Universal Coupling
Oldham Coupling
Machines,
servomechanisms,
instrumentation,
light machinery,
steel industry,
the petrochemical industry,
utilities, off-road vehicles,
and heavy machinery, etc.
other flexible coupling applications;
Elastomeric coupling has elastic properties.
It is the part of the flexible coupling which can attain their flexibility from the material’s tension and compression ability.
Material Example: Rubber, plastic, etc.
Advantages:
Material uses: Rubber or plastic leading to low in cost and allows temperature rise.
Resistant to fatigue failure.
It provides longer life at a minimal cost.
Regular maintenance is not required as it doesn’t use any lubrication.
No need to use lubrication, so regular maintenance is not required.
Mechanically flexible couplings are part of the flexible coupling, and it gets its flexibility from the loose-fitting parts and the rolling and sliding parts.
It requires regular lubrication.
Example: Nylon gear coupling
A gear coupling
is the application part of a flexible coupling
It is the type of coupling the shafts with gears mounted on the hubs.
Sleeves (hollow cylinders) have internal gear teeth.Image credit:Petteri Aimonen, Gear coupling, marked as public domain, more details on Wikimedia Commons
Regular lubrication is required.
lubrication used: grease, oil
Advantages :
It provides good torque characteristics.
Metallic membrane coupling is the application of flexible coupling.
It gets its flexibility from the flexing of the metallic discs (thin).
Miscellaneous coupling is part of the flexible coupling.
This type of coupling gets its flexibility from the combinations of the mechanisms like spring couplings.
It Transmits power.
It Transmits torque.
The selection of the flexible coupling
depends on the max rotational speed.
Power loss is due to the friction heat from the sliding and rolling at high speeds.
Loss of efficiency is due to frictional losses.
The flexible coupling has the advantage that it is the coupling that can give efficiency more than 99%.
It allows small misalignments.
It absorbs shock loads and vibrations.
It can transmit a high amount of torques.
Simple in construction
It has a high cost due to additional parts.
Require more space.
It is the type of coupling used to connect shafts with smaller misalignments.
Transmits the torque from the high tensile material to the input shaft.
Material used: Rubber and leather(bush)
The material gives the flexibility to the coupling.
The flanges are keyed to the shafts.
Example: Electric motors.
The permissible bearing pressure value= 0.5 N/mm2
The grooved coupling having the flexible connection is Flexible grooved coupling.
It allows some misalignment in the shaft connection.
Some couplings don’t require regular maintenance. It can work properly on its own.
The coupling is all flexible metal parts coupling. The coupling is known as Thomas flexible disc coupling.
Flexible coupling can be used with low levels of torque transmission
and small misalignments.
It allows slight misalignment and still can transmit the same amount of torque as rigid coupling.
As you know that Flexible coupling creates flexible connections between equipment and the components used to assemble the coupling fixed with some amount of loose, that why some amount of misalignment it can absorb. But metallic flexible type has greater torque capability than other flexible couplings, and some torque will be lost during complete operation of equipment.
Flexible shaft coupling is the flexible connection of the coupling shafts
It prevents coupling failure.
It reduces noise, vibrations and protects coupling components.
It is the type of coupling which has an extra length shaft installed in the shafts.
It provides space to remove the mechanical seal during maintenance.
Up to 400 mils.
The flexible coupling is designed to calculate the torque and power transmission, considering the misalignment in any direction.
Due to less misalignment, There is less movement in the parts.
This leading to less axial and bending stresses development in the shafts.
Torque=P/rotational speed,
If the speed of the shaft increases, power increases, and torque decrease. There is the possibility of a loss of torque.
Parallel misalignment=0.005in,for smaller couplings,
Parallel misalignment=0.030in,for larger couplings,
angular misalignment=±3°
Parallel offset: This type of offset occurs in the flexible couplings shaft connection where both the shaft axes are parallel to each other and not in the same line.
Angular offset: This type of misalignment occurs in the flexible coupling shafts where the axes of the shafts meet at the center points of the coupling.
Combined parallel and angular offset: This type of misalignment is the flexible coupling offset of the shafts where the axes of the shafts do not intersect and are not parallel to each other.
Brass.
Aluminum.
Cast Iron.
Stainless Steel.
Carbon Steel.
Rubber etc.
At the high temperature, the couplings will transmit thrust between the machines.
A the temperature increases, the couplings will be more flexible and it will give more flexible connection.
At increasing temperatures, The coupling losses it’s torsional stiffness, increasing more pressure.
Roller chain coupling, in which sprockets are attached at adjacent ends of the two abutting shafts, then wrapped together by a common roller chain segment that spans both sprockets. Clearance between the chain and the sprockets allows up to degrees of angular shaft-centerline misalignment and up to about 0.010 inches parallel shaft-centerline misalignment. Roller chain couplings are low-cost, high-torque devices but may be noisy. Wear or fretting wear is a potential failure mode.
It is a device used to provide maximum mechanical protection.
It is the protected type flexible coupling device which protects the coupling.
Flexible disk couplings are the disc type coupling that allows smaller angular and parallel misalignment.
Misalignment of about one degree of angular misalignment and an inch of parallel shaft misalignment can be observed.
A grid coupling is a system consisting of two shafts, a grid spring(metallic), and a split cover.
This type of coupling is the coupling device that transmits torque between the coupling shafts using a metallic grid spring.
Advantages:
High torque density.
The grid coupling spring elements have the ability to absorb shock loads and peak loads.
It also has the capacity to dampening the vibrations.
flexible type of coupling tend to have ability to allow the misalignment.
1)The motor power is 50 KW, and the speed given in rpm is 300rpm. The bearing pressure on bush is equal to 0.5MPa. Allowable shear stress is 25MPa, and the bearing stress is 50MPa. The shear yield strength given is 60MPa. Given data: shaft dia. = 50mm,pins diameter(PCD)=140mm.
Determine the dimensions of the rubber bush for flexible coupling.
Solution:
Torque transmitted,
T=Power/(2πN/60)
T=50*103/(2π*/60)
T=159N-m.
shaft diameter
d=16T/πτy1/3
d = 16*159/π601/3
d=23.8mm
Let, d=25mm,
dneck=0.5d/√n
n= no. of pins,
n=4d/150+3
n=4*25/150+3
n=4,
dneck= 8mm shear stress,
τ = T/(πdneck2n*dc/4*2)
τ =11.29 Mpa
yield stress of the pin material.
d=Dpin+2*t(sleeve)
d=20mm
t=6mm
Bush length,T=npLdbushdc/2
T= 159Nm, p = 0.5MPa,
dbush =0.02m and dc = 0.14m ,L = 56.78 mm.
2)Design a bushed-pin type flexible coupling shaft transmitting 50 Kw at rpm. The bearing pressure in the rubber bush is 0.5MPa and allowable shear stress in the pins is 25Mpa.
The Diameter of shaft is 60 mm.
Given:
P = 50KW;
N = rpm,
d = 50 mm,
Solution:
T = (p)/ (2πN/60) = (50××60)/ (2π×) = 477.46 N-mm.
T=π/16τsd3
477.46*103 = π/16τs603
τs=0.011 N/mm2
τs = 11MPa
Design of hub:
D=2d=260=120mm, Length=1.5d=1.560=90mm,
T=π/16τc(D4-d4/D)
477.46*103 = π/16τc(-604/120)
τc = 1.5 MPa
Design of key:
W=20mm,
t=10mm,
L=1.5d=1.560=90mm,
T=LWτK(d/2)
477.46*103 = 90*20τK(60/2)
τK = 8.8MPa
Key in crushing:
477.46*103 = 90 60/2 10/2 σck
σk = 35.36MPa
Design of flange:
t=0.5d=0.560=30mm,
T=πD2/2τct
477.46*103 = π/2τc30
τc=0.35MPa
Design of bolt:
d1=0.5d/√n
d1=0.5*60/√6
d1=12.24mm.
n=6,
Assume t= 5 mm, (rubber bush)
d2=25+22+25
d2=39mm,
D1=2d+d2+2n D1=171mm, D2=4d=460=240mm, W=Pbd2l, W=0.539l,
T=WnD1/2
447.46*103 = 19.516(171/2)
l=44.7mm,
W=871.65N.
Due to pure torsion, τ = W/π/4d12
τ = 871.65/π/412.242
τ = 7.4MPa
Jaw type coupling
Donut type coupling
Pin and bushing type coupling.
If you are looking for more details, kindly visit Heavy Duty Flexible Coupling.
solid coupling is rigid coupling. a Rigid coupling is the coupling device that is rigid in connection, whereas flexible coupling is the coupling device that is flexible in connection.
Flexible coupling elements have the ability to absorb vibrations and shock loads, whereas rigid coupling is free of vibrations and shock loads.
Shielded coupling is a unique type of coupling.
Shielded coupling is encased in a metal case.
It is used for underground applications.
General-purpose Flexible coupling
Gear type
Chain type
Grid type coupling
special purpose Flexible coupling
mechanically flexible type, etc.
For more articles, click here.
Read more about Rigid And Flange Rigid Coupling.
This is the third installment in a weekly 3-part series on flexible vs rigid couplings running through December. Here, Ruland’s Bobby Watkins shares his insight into the best options for different coupling applications. This excerpt was taken from Watkins’ presentation during the Design World Webinar, Flexible vs Rigid Couplings.
A little bit about Ruland Manufacturing. We have manufacture all types of couplings: Rigid couplings, servo insert couplings, bellows, metal bellows, metal disc, oldham types and beams, so we offer the full range of types of motion control couplings.
The types of misalignment earlier were covered pretty well, and again, talking about rigids in particular at this point, they’re probably the most misapplied, maybe the most misunderstood, of all the couplings. They’re not going to accommodate any of these types of misalignment, but they do have a purpose and they’re very, very effective when used in the right circumstance.
Again, why is misalignment a concern? If you’ve got misalignment and your coupling is not addressing that misalignment, you’re going to have problems, either with broken couplings or bearing failures, and again, if you’ve got misalignment present in your system, no doubt, you need a flexible coupling to solve those issues for you. Backlash, windup, and bearing load. Some of the types of motion control couplings have windup. Some of the types of couplings like the servo insert couplings and the beam couplings, have some windup, some vibration absorption capabilities, shock absorption capabilities, and these are important features to have in certain applications where you don’t necessarily want or need high torsional stiffness, but you need some vibration dampening. The bellows type, disc type, those are high torsional stiffness types, and of course, the rigids are probably the ultimate torsionally stiff coupling. Let’s see.
This was talked about earlier, if you use the wrong coupling in an application, you’re going to have bearing load issues and no more so than with the rigid. If you put a rigid in an application where there is misalignment, bad things are going to happen and probably very quickly. You’re going to need bearings, destroy components, and bearing load consideration is very, very important as part of the design. Managing misalignment, again, this is just showing a few different types. The following image is exaggerated, by the way. It would be nice if bellows couplings could really forgive that much in angular, but they can’t.
It makes a good marketing picture, I guess. Again, selection of the correct coupling is critical. Address the application misalignment. This is a huge issue that we see in the field. Many, many types of couplings, bellows couplings in particular, fail if you install them either compressed or extended. That’s a very important thing to address. We see quite a bit of problems with customers on installation issues.
Rigid couplings. The benefits. Best torque transmission capabilities, call that highest torque transmission capabilities, size for size. Almost zero windup, the most precise coupling available. It’s basically like welding your shafts together. Suitable for shaft support in push-pull applications, relatively low cost. The drawbacks, as we’ve talked about. It has no misalignment capabilities, no allowance for thermal expansion. Even if you have your shafts perfectly aligned, but you’ve got a high-speed stepper or servo motor cranking up at 10,000 RPM, you’re going to get some thermal expansion of that motor shaft. The rigid coupling is not going to accommodate it, it’s going to push that load right back on the bearing, and you’re going to cook your servo or stepper motor bearing. You’re going to cook the motor. Something to keep in mind is that even if you’ve got perfectly aligned shafts, you’ve got to watch out for that thermal expansion of motor shaft. We tell customers to be careful once you get over about 5,000 RPM. You start getting over 5,000 RPM, you’re probably going to have thermal expansion as an issue at that point.
One of the realities you have to deal with is mounting rigid couplings. If you don’t have a design in place to make your alignment easy, they can be very difficult to align. You’re shimming, you’re using lasers… I’ll give you an example on an actuator. A linear actuator, a ball screw actuator, if you use clearance holes on your motor bracket flange, what you do is you bolt the motor up to the flange, slide the coupling on, and tighten down the coupling first. The coupling will pull the motor into alignment for you. You use the rigid coupling at assembly to pull your motor and your ball screw shaft into alignment with each other and then bolt down the motor last. If you build in the correct clearances it works extremely well. We sell a tremendous amount of rigid couplings in actuator applications where there’s a motor bracket.
If you don’t have a motor bracket, you can set up your bracketry in such a way where you’ve got some clearance and forgiveness built in. You put the rigid coupling on, let it pull things around it into alignment, then go tighten your components down. This way of doing it works very, very well. However, if you’ve got high RPM applications, this isn’t going to help you because you’re still not accounting for thermal expansion. One of the other things about rigid couplings that we run into, being a manufacturer, is we’ll have customers call us and they’ll say, “You know, I’ve tried five different types of couplings. I’m breaking them all. I just want to put a rigid coupling in there, and the problem’s going to go away.” This is a common call that we do get, and it’s typically because the customer has a bad alignment issue and he’s breaking flexible couplings because he’s asking more than they can give. We try to protect customers from themselves sometimes because there’s a rush sometimes to put a rigid in there as a fix-all for problems with flexible couplings. If you build in a way to do your assembly, you can use the coupling to do the alignment for you. It becomes very simple. Again, very accurate, high torque, and it can be a great coupling if used correctly in the right application.
The Oldham couplings are wonderful. They’re a little compromise, if you will. They’re not as torsionally stiff as a bellow or a disc, but they are stiffer than a jaw coupling. They’re a good compromise. They work in a tremendous amount of applications where you don’t quite need the high torsional stiffness of a bellows. The beauty of the Oldham is it’s very, very forgiving, especially in parallel. They’re becoming very, very popular, in stepper and servo drive systems. They’re stiff enough, they’re cost effective, they’re easy to install, they’re very, very forgiving. The beam type coupling, is typically for encoder applications and very light duty applications. They have a lot of windup to them, which if you ask too much of a beam coupling, all that windup’s going to give you some positioning error, but again, they work very well for transducers and encoders and applications where there’s not a lot of torque.
There’s been a lot of talk about the bellows as well– high torsional stiffness, very, very popular. You can get the high speed, high torsional stiffness out of this that you cannot get out of a rigid. You can get well over 5,000 rpm. Then, of course, the curve-jaw coupling, or the servo insert on a jaw coupling. It’s going to give you that vibration absorption, that dampening, where in a lot of applications, if you’ve got a very aggressive move profile, you’ve got shock loads. If you use the rigid or a bellows, which don’t have any ability to absorb shock load, it can either destroy couplings or beat up bearings and so forth. A servo jaw coupling gives you that vibration and shock load absorption. The disc coupling has similar qualities to the bellows coupling. High torsional stiffness, high RPM ability, and it can forgive a little more in angular than the bellows couplings do, but not quite as popular. The bellows couplings seem to be much more popular, especially here in North America.
Product selection. Again, multiple solutions exist when selecting a coupling. Hopefully I covered everything.
Ruland
www.ruland.com
Products
Couplings, Flexible Shafts & Universal Joints
Couplings, Flexible Shafts & Universal Joints
Couplings are devices used to connect two shafts together and are divided into two categories: Rigid and Flexible Couplings
Both flexible and rigid couplings are used for the purpose of transmitting power. However, rigid couplings are limited in comparison to flexible couplings. Flexible couplings are designed to accommodate: angular misalignment, angular offset, axial movement, and various types of load conditions. Rigid couplings are used where shafts are already positioned in precise lateral and angular alignment. Their rigid design does not allow for any misalignment between shafts, but they are generally able to transmit more power than flexible couplings.
With many styles and types of couplings available, your application conditions must be clearly understood. ...Our experienced engineers can solve even the most difficult application issues and find the right coupling solution for your application. SDP/SI offers a wide variety of both rigid and flexible couplings. Many of our precision couplings are designed with our unique Fairloc® Hub design, including the Miniature Fairloc® Bellows Coupling and the Neo-Flex Coupling. Modular Bellows Couplings can be configured to accommodate various shaft diameters and provide backlash-free torque transmission. Magnetic Disk Couplings are built to handle up to 3° of angular offset and operate in temperatures up to 284°F.
Flexible Shafts can be used in applications where the load must be moved in many directions. Flexible Shafts are stiff in torsion and very compliant in bending and lateral misalignments. They are extremely useful where the load is located in a remote position requiring many gear and shafting combinations. The basic design considerations are torque capacity, speed, direction of rotation, bend radii and service conditions.
Metal and Molded Universal Joints
Universal joints are used to transmit power, motion, or both. Cardan joints or Hooke joints are the most common and consists of two yokes, one on each shaft, connected by a cross-shaped intermediate member called the ”spider”. The angle between the shafts is called the operating angle. It is usually constant during operation, but not necessarily so. Good design practice calls for low operating angles, often less than 25°.
Universal joints are available in steel or in thermoplastic body members. For maximum load-carrying capacity, for a given size, a steel universal joint should be selected. Universal joints with thermoplastic body members are used in light industrial applications in which their self-lubricating feature, light weight, negligible backlash, corrosion resistance and capability for high-speed operation are significant advantages.... Ball-jointed universals are used for high-speed operation and for carrying large torques. They are available in miniature and standard sizes.
SDP/SI pioneered the concept of combining the exceptional qualities of selected plastic materials with different metals to create products which incorporate both. “SUPER-PLAST®” designs have the following advantages:
• Inexpensive replacement of metal components
• Dampens vibration
• Corrosive and chemical resistant
• Electrically insulated
SDP/SI offers an extensive selection of inch and metric dimensioned universal joints available in steel, stainless steel, acetal and acetal with brass spider and inserts as standard catalog items.
The molded universal joints can be manufactured to special requirements:
• Bores molded to accommodate square, “D” shape or hexagonal shafts
• Shafts molded into the components
• Zero backlash or components with built-in backlash
• Gears, pulleys or other components molded or assembled to couplings or universal joints
Call to discuss your special need or application.
NEW FLEXIBLE DISK-TYPE COUPLINGS:
AVAILABLE IN:
Materials: Stainless Steel, Aluminum
Bore Size: 3mm - 12mm
Outer Diameter: 15mm - 39mm
Length: 16.5mm - 32.8mm
Stock Drive Products/Sterling Instrument (SDP/SI) expands their selection of flexible couplings to include the single disk type couplings (short type), series S50XHSM… and the double disk type couplings (standard length type), series
These disk-type flexible couplings are an economical option while providing greater torque capability and improved performance in a reduced size. The compact design provides torque ratings of 0.6 up to 12 Nm, an improvement over similar products. Device manufacturers can benefit from the smaller size and reduced weight while gaining greater torque capacity and power. As a high-performance motion control coupling, disk-type couplings are well suited for applications where precise position accuracy is required.
Stock Drive Products/Sterling Instrument (SDP/SI) expands their selection of flexible couplings to include the single disk type couplings (short type), seriesand the double disk type couplings (standard length type), series S50XHWM ..These disk-type flexible couplings are an economical option while providing greater torque capability and improved performance in a reduced size. The compact design provides torque ratings of 0.6 up to 12 Nm, an improvement over similar products. Device manufacturers can benefit from the smaller size and reduced weight while gaining greater torque capacity and power. As a high-performance motion control coupling, disk-type couplings are well suited for applications where precise position accuracy is required.
PRECISION FLEXIBLE BELLOWS COUPLINGS:
AVAILABLE IN:
Materials: Brass, Bronze, Stainless Steel, Nickel, Steel, Aluminum, Neoprene, Nylon, Zinc
Bore Size: 0. in. (1mm) - 1.750 in. (45mm)
Outer Diameter: 0.250 in. (6.4mm) - 3.700 in. (94mm)
Length: 0.480 in. (14.2mm) - 3.55 in. (90.3mm)
SDP/SI Bellows Couplings are flexible couplings designed to accommodate various types of load conditions. SDP/SI Hi-Flex Bellows Couplings are used for applications which require large amounts of shaft misalignment combined with low resultant radial loads on the bearings. SDP/SI Modular Bellows Couplings are configurable and provide high torsional rigidity for high speed torque transmission. A wide variety of bore sizes and combinations are offered to accommodate specific needs.
SDP/SI Bellows Couplings are flexible couplings designed to accommodate various types of load conditions. SDP/SI Hi-Flex Bellows Couplings are used for applications which require large amounts of shaft misalignment combined with low resultant radial loads on the bearings. SDP/SI Modular Bellows Couplings are configurable and provide high torsional rigidity for high speed torque transmission. A wide variety of bore sizes and combinations are offered to accommodate specific needs.
PRECISION FLEXIBLE HELICAL COUPLINGS:
AVAILABLE IN:
Materials: Aluminum, Stainless Steel, Steel
Bore Size: 0.094 in. (2mm) - 1.00 in. (12mm)
Outer Diameter: 1/4 in. (6.35mm) - 2 1/4 in. (31.8mm)
Length: 0.37 in. (20mm) - 3.50 in. (58mm)
SDP/SI Helical Couplings, or beam couplings, are another type of flexible coupling allowing for axial motion, angular misalignment and parallel offset. This coupling design features one-piece construction resulting in zero backlash. The coupling is made flexible by removing material from the piece in a spiral pattern. SDP/SI Helical Couplings are available in aluminum and stainless steel.
SDP/SI Helical Couplings, or beam couplings, are another type of flexible coupling allowing for axial motion, angular misalignment and parallel offset. This coupling design features one-piece construction resulting in zero backlash. The coupling is made flexible by removing material from the piece in a spiral pattern. SDP/SI Helical Couplings are available in aluminum and stainless steel.
COMMERCIAL & PRECISION FLEXIBLE COUPLINGS:
AVAILABLE IN:
Materials (include): Aluminum, Stainless, Steel, Resin, Brass, Bronze, Steel, Iron, Nickel, Copper, Polymer, Rubber, Acetal, Neoprene, Nylon, Zinc, Silicone, Polyurethane, Polyimide, Polyethylene, Fiberglass
Bore: 0. in. (1mm) - 1.750 in. (45mm)
Outer Diameter: 0.25 in. (6.4mm) - 3.70 in. (94mm)
Length: 0.375 in. (7mm) - 3.55 in. (90.3mm)
Flexible Couplings have the ability to compensate for shaft misalignment and are designed to accommodate various types of load conditions. No one type of coupling can provide the universal solution to all coupling problems; hence many designs are available, each possessing construction features to accommodate one or more types of application requirements. SDP/SI offers many styles of flexible couplings, such as bellows couplings, helical couplings, oldham couplings, universal joints, and flexible shafts.
Flexible Couplings have the ability to compensate for shaft misalignment and are designed to accommodate various types of load conditions. No one type of coupling can provide the universal solution to all coupling problems; hence many designs are available, each possessing construction features to accommodate one or more types of application requirements. SDP/SI offers many styles of flexible couplings, such as bellows couplings, helical couplings, oldham couplings, universal joints, and flexible shafts.
PRECISION FLEXIBLE ANTIVIBRATION COUPLINGS:
AVAILABLE IN:
Materials: Aluminum, Steel, Rubber
Bore Size: 3 mm - 16 mm
Outer Diameter: 15 mm - 39 mm
Length: 18 mm - 55 mm
For position accuracy and vibration reduction in a servo system, these couplings solve misalignment challenges in response-mandatory servo systems designed for the semiconductor manufacturing equipment industry, scanning equipment and many automation applications. Standard sizes available in. bores 3 mm thru 16 mm. Call for custom requirements.
For position accuracy and vibration reduction in a servo system, these couplings solve misalignment challenges in response-mandatory servo systems designed for the semiconductor manufacturing equipment industry, scanning equipment and many automation applications. Standard sizes available in. bores 3 mm thru 16 mm.
PRECISION FLEXIBLE JUNIOR (BOWEX NYLON) COUPLINGS:
AVAILABLE IN:
Materials: Nylon
Bore Size: 6 mm - 20 mm
Outer Diameter: 40 mm - 52 mm
Length: 48 mm - 56 mm
Two-and Three-Piece Junior Couplings are curved tooth gear couplings made of nylon. Designed to compensate for axial, radial and angular misalignment, they are lightweight and maintenance free.
Two-and Three-Piece Junior Couplings are curved tooth gear couplings made of nylon. Designed to compensate for axial, radial and angular misalignment, they are lightweight and maintenance free.
PRECISION MAGNETIC DISK COUPLINGS:
AVAILABLE IN:
Materials: Stainless Steel, Steel, Nickel
Bore Size: 0.125 in. (5mm) - 1.000 in. (19mm)
Outer Diameter: 1.06 in. (27mm) - 2.86 in. (73mm)
Length: 0.63 in. (15mm) - 1.00 in. (25.4mm)
A magnetic coupling transfers torque by using a magnetic field rather than a physical mechanized connection to transfer torque from an input shaft to the output shaft.
Because a non-contact magnetic bond is established between the two shafts, these couplings are most commonly utilized for liquid pumps and propeller systems where seals will wear out or break over time as the two surfaces slide against each other. Magnetic couplings use extremely strong natural magnets to transfer torque (without physically touching).
A magnetic coupling transfers torque by using a magnetic field rather than a physical mechanized connection to transfer torque from an input shaft to the output shaft.Because a non-contact magnetic bond is established between the two shafts, these couplings are most commonly utilized for liquid pumps and propeller systems where seals will wear out or break over time as the two surfaces slide against each other. Magnetic couplings use extremely strong natural magnets to transfer torque (without physically touching).
PRECISION MINIATURE BALL COUPLINGS:
PRECISION MULTI - JAWED COUPLINGS:
AVAILABLE IN:
Materials: Stainless Steel
Bore Size: 0. in. - 0. in.
Outer Diameter: 0.75 in.
Length: 0.87 in.
SDP/SI Precision Multi-jawed Coupling is a rigid coupling that accommodates minimal shaft misalignment. The helical gear coupling enables a positive connection between two shafts that can be disconnected or connected at any time when stopped.
SDP/SI Precision Multi-jawed Coupling is a rigid coupling that accommodates minimal shaft misalignment. The helical gear coupling enables a positive connection between two shafts that can be disconnected or connected at any time when stopped.
COMMERCIAL & PRECISION OLDHAM COUPLINGS:
AVAILABLE IN:
Materials: Stainless Steel, Aluminum, Acetal, Brass
Bore Size: 0.125 in. (2mm) - . in. (12mm)
Outer Diameter: 0.25 in. (6.4mm) - 1.62 in. (41.1mm)
Length: 0.50 in. (12.7mm) - 2.00 in. (50.8mm)
An Oldham coupling consists of three parts: one hub that is connected to the input shaft, one hub that is connected to the output shaft, and a floating member that is connected to the first two by tongue and groove in the center of the coupling. One side's tongue and groove is 90° or perpendicular to the other's tongue and groove. The input and output shafts rotate at the same speed as the middle member, around its center. Twice per rotation, the center traces a circular orbit around the halfway of the input and output shafts. To prevent backlash, springs are typically employed.
Oldham Couplings can accommodate lateral shaft misalignments up to 10% of nominal shaft diameters and up to 3° angular misalignments. Lubrication can be a problem but in most applications, can be overcome by choosing a coupling that uses a wear resistant plastic or an elastomer member in place of steel or bronze floating members.
An Oldham coupling consists of three parts: one hub that is connected to the input shaft, one hub that is connected to the output shaft, and a floating member that is connected to the first two by tongue and groove in the center of the coupling. One side's tongue and groove is 90° or perpendicular to the other's tongue and groove. The input and output shafts rotate at the same speed as the middle member, around its center. Twice per rotation, the center traces a circular orbit around the halfway of the input and output shafts. To prevent backlash, springs are typically employed.Oldham Couplings can accommodate lateral shaft misalignments up to 10% of nominal shaft diameters and up to 3° angular misalignments. Lubrication can be a problem but in most applications, can be overcome by choosing a coupling that uses a wear resistant plastic or an elastomer member in place of steel or bronze floating members.
COMMERCIAL & PRECISION RIGID SHAFT COUPLINGS:
AVAILABLE IN:
Materials: Stainless Steel, Acetal, Aluminum, Steel, Brass
Bore Size: 0.09 in. (0.8mm) - 0.50 in. (15.0mm)
Outer Diameter: 0.125 in. (7mm) - 0.53 in. (27mm)
Length: 0.21 in. (7mm) - 1.00 in. (38mm)
Rigid Couplings have limited applications unlike flexible couplings. Rigid couplings do not have the ability to compensate for shaft misalignments are therefore used where shafts are already positioned in precise lateral and angular alignment. Because of their simple rugged design, rigid couplings are generally able to transmit more power than flexible couplings of comparable size. However, this is not an important advantage, unless the application is high horsepower.
Rigid Couplings have limited applications unlike flexible couplings. Rigid couplings do not have the ability to compensate for shaft misalignments are therefore used where shafts are already positioned in precise lateral and angular alignment. Because of their simple rugged design, rigid couplings are generally able to transmit more power than flexible couplings of comparable size. However, this is not an important advantage, unless the application is high horsepower.
COMMERCIAL FLEXIBLE SHAFTS WITH CASING:
AVAILABLE IN:
Materials: Bronze, Brass, Steel
Flexible Shaft Diameter: 0.13 in. - 0.25 in.
Length: 24 in. - 48 in.
PRECISION & COMMERCIAL FLEXIBLE SHAFTS WITHOUT CASING:
PRECISION & COMMERCIAL METAL UNIVERSAL JOINTS:
AVAILABLE IN:
Materials: Stainless, Steel, Steel, Zinc
Bore Size: 0. in. (2.5mm) - 0. in. (20mm)
Outer Diameter: 3/16 in. (4.76mm) - 1 in. (32mm)
Length: 1 in. (25.4mm) - 7.30 in. (185mm)
Single and double joint stainless steel and alloy steel universal joints are offered with a variety of bore sizes. Miniature universal joints feature zero backlash, sealed-in lubrication and low inertia. Inverted design universal joints are small in size and lightweight for given torque capacity. These joints may be made into telescoping units by mating them with telescoping miniature ball splines.
Single and double joint stainless steel and alloy steel universal joints are offered with a variety of bore sizes. Miniature universal joints feature zero backlash, sealed-in lubrication and low inertia. Inverted design universal joints are small in size and lightweight for given torque capacity. These joints may be made into telescoping units by mating them with telescoping miniature ball splines.
COMMERCIAL PLASTIC UNIVERSAL JOINTS:
AVAILABLE IN:
Materials: Acetal
Bore Size: 1/8 in. (2mm) - 3/8 in. (10mm)
Outer Diameter: 1/4 in. (6.3mm) - 5/8 in. (15.9mm)
Length: 3/4 in. (19mm) - 4 13/32 in. (111.8mm)
Plastic universal joints are inexpensive, dampen vibration, electrically insulating, and are well suited for low torque applications. We offer a wide variety of sizes and styles as standard catalog items. We can also manufacture them to specific requirements, please consult SDP/SI Engineering for further details.
Plastic universal joints are inexpensive, dampen vibration, electrically insulating, and are well suited for low torque applications. We offer a wide variety of sizes and styles as standard catalog items. We can also manufacture them to specific requirements, please consult SDP/SI Engineering for further details.
COMMERCIAL TELESCOPING UNIVERSAL JOINTS:
AVAILABLE IN:
Materials: Acetal, Brass, Stainless Steel
Bore Size: 0.125 in. (2mm) - 0. in. (14mm)
Outer Diameter: 0.25 in. (6.3mm) - 0.625 in. (25.41mm)
Length(closed): 1.5 in. (38.1mm) - 10.1 in. (256mm)
Stainless steel telescoping universal joints are offered in a number of sizes and are heat and corrosion resistant. Telescoping miniature universal joints feature zero backlash and accommodate 1/4 axial motion. Molded universal joints with a molded slide extension or brass slide extension are available in a variety of sizes, shorter or longer lengths are available on special order.
Stainless steel telescoping universal joints are offered in a number of sizes and are heat and corrosion resistant. Telescoping miniature universal joints feature zero backlash and accommodate 1/4 axial motion. Molded universal joints with a molded slide extension or brass slide extension are available in a variety of sizes, shorter or longer lengths are available on special order.
PRECISION ZERO BACKLASH UNIVERSAL JOINTS:
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