Choosing the right Cardan shaft is crucial for ensuring the optimal performance and reliability of your machinery. At MND Auto Industries, we understand the importance of selecting a shaft that meets your specific requirements. Here are the critical factors to consider when buying a Cardan shaft:

Link to Zhenjing

Usually what happens is you have to have these details with you for your required Shaft and accordingly the manufacturer (MND AUTO INDUSTRIES) will make it for you.

The flange is the connecting interface of the Cardan shaft to the machinery. It must match the counterpart component precisely. Ensure the flange type and dimensions align with your equipment specifications to prevent misalignment and ensure a secure fit.

The Pitch Circle Diameter is the diameter of the circle that passes through the center of all the bolts on the flange. Accurate measurement of the PCD is essential for compatibility with your equipment. Incorrect PCD can lead to improper fitment and operational inefficiency.

The bolt size and the number of holes on the flange are crucial for securing the Cardan shaft to the machinery. Ensure that both match your equipment's requirements. A mismatch can cause connection instability and potential mechanical failure.

The thickness of the flange affects the overall strength and durability of the connection. It is important to select a flange with an appropriate thickness to handle the operational loads without deformation.

The keyway depth is essential for ensuring a secure and stable connection between the shaft and the hub. An incorrect keyway depth can lead to slippage or misalignment, causing operational issues and potential damage.

The face-to-face length of the flange determines the overall length of the Cardan shaft. This measurement is critical for ensuring that the shaft fits properly within the available space in your machinery and operates smoothly without causing stress to other components.

The Universal Joint (UJ) cross bearing cup size is a key factor in the flexibility and range of motion of the Cardan shaft. Ensure the bearing cup size is compatible with your application to facilitate smooth rotation and reduce wear and tear.

The closed length and expanded length of the Cardan shaft determine its range of compression and extension. These dimensions are crucial for applications where the shaft needs to adjust to varying distances during operation. Ensure these lengths match your requirements to avoid overextension or compression.

The male spline shaft must match the corresponding female component in your machinery. The spline ensures torque transmission without slippage. Verify the spline dimensions and count for compatibility.

The diameter of the pipe affects the strength and torque capacity of the Cardan shaft. Select a diameter that can handle the operational torque without bending or breaking. This is particularly important for high-torque applications.

The torque capacity of the Cardan shaft must be sufficient to handle the operational loads of your machinery. Ensure the shaft is rated for the maximum torque your application will generate to prevent mechanical failure.

Types of Shaft Couplings - A Thomas Buying Guide

Guides

Shaft couplings are available in different sizes and material finishes

Image credit: similis/Shutterstock.com

A shaft coupling is a mechanical device used to connect rotating shafts and absorb misalignments between them. Couplings can be rigid or flexible depending on the alignment accuracies of the system and torque requirements. Shaft couplings are used for power and torque transmission between two rotating shafts such as on motors and pumps, compressors, and generators.

Types of Couplings and Their Applications

The different styles and types of shaft couplings are summarized below.

Beam Couplings

The beam coupling consists of single or multiple helical cuts in the coupling body which typically can accommodate parallel misalignments up to 0.025 inch and angular misalignments up to 7 degrees. They are used primarily for motion control applications where torques are typically below 100 inch-lbs. Zero backlash designs available ensure positioning accuracy between driving and driven shafts.

Use Thomas' Supplier Discovery Platform to find Suppliers of Beam Couplings.

Bellows Couplings

Bellows couplings are also suited to motion control applications. They consist of multiple convolutions of metal which provide high torsional stiffness which is important to positioning applications. Torsional stiffness reduces the level of angular and parallel misalignment they can accommodate compared with beam couplings, although torque transmission capabilities are about similar.

Use Thomas' Supplier Discovery Platform to find Suppliers of Bellows Couplings.

Chain Couplings

Chain Couplings are suited to power transmission applications and are used to transmit power up into the hundreds of horsepower range. Angular and parallel misalignment allowances are typically 2 degrees and 0.015 inches, respectively. Typical chain couplings use special chain sprockets and double wide roller chains whose clearances permit the design to operate as a flexible coupling.

Use Thomas' Supplier Discovery Platform to find Suppliers of Chain Couplings.

Jaw Couplings

Curved and Straight Jaw couplings are used for both motion control and light power transmission applications and consist of pairs of multi-jawed hubs that mate with elastomeric spiders. The design allows for backlash-free torque transmission. Accommodation for parallel misalignment usually approaches 0.01 inch and angular misalignment about 1 degree. Elastomeric spiders give these couplings some damping capacity and of often the spiders are available in different durometers to lend specific properties to the individual couplings. These couplings often operate without lubricant and can transmit torque up into the inch-lb. range.

Use Thomas' Supplier Discovery Platform to find Suppliers of Jaw Couplings.

Diaphragm Couplings

Diaphragm couplings are generally used for high power transmission such as found in turbomachinery. Typically they employ one or more flexible metal convoluted discs which transmit power to an inner spacer shaft then back out through another diaphragm stack to the driven machinery. A principal advantage over gear type couplings is their lack of lubrication requirements. Diaphragm couplings are capable of high torque transmission and high-speed operation.

Use Thomas' Supplier Discovery Platform to find Suppliers of Diaphragm Couplings.

Disc Couplings

Disc couplings use single or multiple discs and single or double stages which bolt to the shaft hubs. They are used for power transmission and rely on the flexibility of their thin metal discs to transmit torque and accommodate angular misalignment. They are not especially good at managing parallel misalignment. They are capable of transmitting high torques and are often used to couple high horsepower motors, gas turbines, etc. to loads.

Use Thomas' Supplier Discovery Platform to find Suppliers of Disc Couplings.

Gear Couplings

Gear couplings also transmit high torques. They have misalignment capabilities generally about 0.01-0.02 inch in parallel and 2 degrees in angular. Gear couplings are often used in pairs with spacer shafts to span the distance between the driving and driven equipment. They generally require lubricant although some designs intended for lighter duty use lubricant free nylons or other polymers for the center sleeve.

Use Thomas' Supplier Discovery Platform to find Suppliers of Gear Couplings.

Grid Couplings

Grid couplings employ spring-like connecting elements that weave between slots machined in the coupling hubs. They are capable of high torque transmission with an added bonus of shock absorption and torsional vibration dampening. They operate without lubricant. They are appropriate for power transmission and capable of handling parallel misalignment up to 0.30 inch and angular misalignment of about ¼ degree.

Oldham Couplings

Oldham couplings handle high degrees of parallel misalignment owing to their sliding element design. Use of an elastomer center element instead of metal is popular in modern versions. Some manufacturers claim an ability to tolerate up to 5-degree angular misalignment through the use of cylindrical, rather than rectangular, sliders.        

Use Thomas' Supplier Discovery Platform to find Suppliers of Oldham Couplings.

Schmidt Couplings

Schmidt couplings are designed specifically to operate on shafts that are offset. They aren’t flexible couplings in the strictest sense, which are designed to accommodate slight misalignment in shafts that are theoretically parallel and square to one another. Schmidt couplings are used in papermaking, printing, and similar machines and function more like a 1:1 gearbox in a more compact space.

Clamping Couplings

Rigid one- and two-piece Clamping couplings lack accommodation for shaft misalignment and are popular for slow or intermittent shafting arrangements where alignment is not of concern. They are the simplest form of shaft coupling and apart from their lack of misalignment tolerance, are inexpensive zero-backlash devices.

Other Couplings

Coupling designs are many only the principal ones are detailed above. Other coupling types include meshing tooth, or Hines, designs, pin and bush couplings, and spline couplings.

Coupling Applications and Industries

Couplings correct for an inability to produce or maintain perfect alignment in coupled machines. Some machines dispense with the need for couplings by running close coupled, meaning that the bearings of the motor support an extended shaft upon which the rotating component of the driven equipment – a pump impeller, for instance – mounts. Where this is practical to do it is done to dispense with the alignment problem. Often, though, the machines require their own bearings and as a result a need to connect their independent shafts. Two misalignments characteristics that can be expected include parallel (or offset) and angular.

For some couplings, backlash is an important concern. Motion control applications where the position of the driven equipment is precisely tied to the position of a servo- or stepper motor rely on zero-backlash couplings to assure that no slop exists in the system. Backlash is a lesser concern for most power transmission applications—pumps/motors for instance—where efficient torque transmission is the primary objective. Here, misalignment can lead to higher energy use, accelerated bearing wear, excessive vibration, etc.

Both the beam and the bellows couplings offer zero backlash and are frequently used for transferring the relatively small torques of motion control.

For power transmission, generally, all-metal couplings such as the gear and disc designs are capable of transmitting higher torques than those that use elastomeric elements such as jaw couplings.

Although couplings are designed to accommodate misalignment, they aren’t substitutes for aligning machines during installation.

Shaft Coupling Considerations

In selecting couplings a designer first needs to consider motion control varieties or power transmission types. Most motion control applications transmit comparatively low torques. Power transmission couplings, in contrast, are designed to carry moderate to high torques. This decision will narrow coupling choice somewhat. Torque transmission along with maximum permissible parallel and angular misalignment values are the dominant considerations. Most couplings will publish these values and using them to refine the search should make picking a coupling style easier. Maximum RPM is another critical attribute. Maximum axial misalignment may be a consideration as well. Zero backlash is an important consideration where feedback is used as in a motion control system.

Some power transmission couplings are designed to operate without lubricant, which can be a plus where maintenance is a concern or difficult to perform. Lubricated couplings often require covers to keep the grease in. Many couplings, including chain, gear, Oldham, etc., are available either as lubricated metal-on-metal varieties and as metal and plastic hybrids where usually the coupling element is made of nylon or another plastic to eliminate the lubrication requirements. There is a reduction in torque capacity in these unlubricated forms compared to the more conventional designs.

Important Attributes

Coupling Style

Most of the common styles have been described above.

Maximum RPM

Most couplings have a limit on their maximum rotational speed. Couplings for high-speed turbines, compressors, boiler feed pumps, etc. usually require balanced designs and/or balanced bolts/nuts to permit disassembly and reassembly without increasing vibration during operation. High-speed couplings can also exhibit windage effects in their guards, which can lead to cooling concerns.

Max Transmitted Horsepower or Torque

Couplings are often rated by their maximum torque capacity, a measurable quantity. Power is a function of torque times rpm, so when these values are stated it is usually at a specified rpm (5HP @ 100 rpm, for instance). Torque values are the more commonly cited of the two.

Max Angular Misalignment

One of the shaft misalignment types, angular misalignment capacity is usually stated in degrees and represents the maximum angular offset the coupled shafts exhibit.

Max Parallel Misalignment

Parallel misalignment capacity is usually given in linear units of inches or millimeters and represents the maximum parallel offset the coupled shafts exhibit.

Max Axial Motion

Sometimes called axial misalignment, this attribute specifies the maximum permissible growth between the coupled shafts, given generally in inches or millimeters, and can be caused by thermal effects. 

Related Product Categories

Universal/Constant Velocity Joints are mechanical assemblies composed of rotating and pivoting components that permit large angular displacement between rotating input and output shafts.

Shaft Coupling Aligners are mechanical or electromechanical instruments that measure misalignment between coupled rotating equipment such as motors and pumps.

Resources

Disc Couplings White Paper

Clamping Couplings for Motion Control

Online Coupling Handbook/Preselection Guide

Chain Couplings

Rigid Shaft Couplings

Overview of Couplings

Other Hardware Articles

Other "Types of" Articles

More from Hardware

Coupling in Software Engineering

Introduction to Coupling in Software Engineering

Coupling in Software Engineering is a part of Software Requirement Specification (SRS) documentation. It defines the factors of dependency and independence of each software module with other modules. It serves as an indicator of interdependency among the modules. The lower the coupling value will be, the higher the quality of the software will be. The name coupling is applied for this process, as it is typically deliberated between two modules at a time. The first step in the coupling process is to evaluate the association between the two modules and define the functionally dependent areas in the modules.

Types of Coupling

Coupling between any two modules is identifiable from the number and types of resources the modules share with other modules. This resource can be a functional behavior, a common interface, a common field in a user interface, the data picked from a field and shared between two modules, a transaction shared between two modules, etc. Based on these possible dependencies, the coupling in software engineering is classified into six different types:

Start Your Free Software Development Course

Web development, programming languages, Software testing & others

The company is the world’s best Cardan Shaft Coupling supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

Common Coupling

Content Coupling

Data Coupling

Control Coupling

Stamp Coupling

External

Every software requirement specification documentation process should have a classification of these coupling between the dependent modules, whichever is applicable after a brief evaluation of the requirements from the client.

1. Common Coupling

Common Coupling consists of the modules that share the overall constraints in the midst of any two software system modules. This also can be a sign that any change made in the common constraint will reflect in the modules that share the common coupling scenario. As with any other process, this common coupling also allows space for characterizing the advantages and disadvantages involved in the process. One should evade this type of dependency, as it calls for more maintenance activities and lesser control over the modules. A fine example of this kind of coupling is the login page, where the login and backend modules are interdependent, as the login validation happens both at the login page and backend database levels.

2. Content Coupling

Content coupling, as the name says, is a case where two modules share their contents, and when a change occurs in one module, the other module needs updation as well. When the modules are not in synch, it leads to a higher level of functional misbehavior. For instance, when two modules share the same data, the primary key columns for both modules’ databases should be related. Otherwise. the content of the modules will reflect non-synch data due to the dependency.

3. Data Coupling

Data coupling occurs when two software system modules have only one type of interaction between them, and if that interaction is in the form of data. Other than the form of data, the modules have no other commonly shared resources like functionality or other system components. An example of data coupling is that two user interfaces, which share data in terms like module 1, pass data for processing to module 2 and receive the processed data back from module 2. Though all the coupling needs minimization, this type of coupling is tolerable as it does not affect any other functional behavior of the software.

4. Control Coupling

Control coupling is a functional flow of the software where the two software modules network by provisioning the shared control involving the modules’ functional activities. The impact of this type of coupling on the software application can be either positive or negative, as it can be defined only based on the type of control being shared by the said modules. It is seen as a positive impact when the functionality is allowed for reusability. This type of coupling is usually observed at the code level when the arguments are reused in more than one place in the functional part of the code.

5. Stamp Coupling

Stamp coupling occurs between any two modules that share a compilation of an already structured intricate data set. As the data and elements are pre-organized and well-placed beforehand, no junk or unused data will be shared between the two coupling modules. This helps in improving the general efficiency of the software and its performance. At the same time, the system designer should know the limitations to what extent stamp coupling can be allowed.

6. External Coupling

External coupling can be described as a situation where the modules are interrelated with common external influencing factors. They can be:

an external legacy application that sends the same set of data or contents to both modules

a hardware requirement common for both modules

a common file/ folder in use by both modules

when both use same switch/router in the network for communication

Advantages of Coupling in Software Engineering

In the Software Engineering process, as a part of the Software Development Lifecycle, the Design phase has ‘coupling’ as one of its essential steps.

Below are the key advantages of performing the coupling process:

Helps in identifying the dependencies of each module with other modules in the

Mainly used for increasing the quality and performance of the software application, as the analysis aids in keeping the coupling value to the

Coupling supports the reusability of the functionality amongst the

When the dependency between the modules is less, the changes done in one unit will not affect the

Provides room for better methods for the maintenance of the

Conclusion

Coupling in Software Engineering is a crucial process, as it is significant in recognizing and limiting the connection among the various modules of the software. In addition, coupling plays a major role in holding the quality and performance of the software system to a maximum level by keeping in check the link amidst all the elements in the software.

Recommended Articles

This is our guide to Coupling in Software Engineering. Here are some further articles for expanding understanding:

What is Coupling? What are main Types of Couplings?

Sharing is Caring :)-

In mechanical system coupling can be defined as a kind of linkage between two rotating shafts which joins driving and driven shafts together. The joint between two shafts may be permanent or temporary. In simple words we can say that coupling is used to join input and output shafts in any power transmission system such as in machine tools gear box shaft is connected to the input engine shaft by means of coupling; engine shaft with pump or compressor shafts etc. The function of the coupling is almost same as the clutches but clutches are temporary joint while the coupling joints are permanent connection.

The basic purpose of the coupling is to join two shafts permanently. The shafts in the power transmission have not collinear connections always; they may be collinear, intersecting axes and parallel with little eccentricity. That’s why different type of couplings is used in mechanical power transmission. According to the requirement and functions different types of coupling are used. The basic features of the different types of coupling are almost same which are given as follow:

Power Transmission

Join misaligned shafts

Reduce shocks and vibration

Easily to assemble and disengage

Shafts can be joined in three ways because generally in three different ways shafts are aligned, these are when both the shafts are parallel or we can say when some eccentricity is present between them, collinear shafts and last one is intersecting shafts (having some angular deflection). All these type of joints require different kind of coupling which is describing below.

Types of Couplings:

1. Oldham’s Coupling:

Oldham’s coupling is used to connect the two parallel shafts when some eccentricity is present between two rotating shafts. In this the two misaligned shafts have disc shape flanges with rectangular slot at the middle. Both the flanges have slot cut which is at right angle to each other. In between two shaft a circular disc assembled having tongue on both side at right angle to fit between the slots of flanges. When shafts rotate then the tongue of the flanges slides into the recess of the flanges of the shafts. The middle disc rotates about its centre but both the misaligned shafts rotate their own axis by means of sliding tongue into the grooves which results the centre of the middle disc traces a circular orbit. A spring is required to remove the backlash of this running coupling. The maximum sliding velocity of the both the tongue in the slots will be the peripheral velocity for the middle disc at midpoint along the circular orbit.

For better understanding watch the following video.

2. Hook’s Coupling:

This is also known as hook’s joint, universal joint or coupling. It is called universal joint because it can able to joint two shafts having intersecting axes. It is used to joint connect two non-parallel and intersecting shafts which has some angular misalignment. The input and output shafts are connected using hook’s joint. The input driving shaft rotates at a uniform angular speed while the driven shaft rotates with varying angular speed i.e. both shafts have different angular speed. Both the shafts rotate in fixed bearing and have a fork at the end. Each fork has four ends and sides which are connected by centre piece. The centre joint generally spherical in shape but can be cross and square according to the requirement. At the centre piece the arms of forks are join at right angle. The fork connection between two shafts provides the motion to the intersecting axes shafts. The main application of this coupling in automobiles where it is used in power transmission from gear box to rear axle.

3. Double Hook’s coupling:

As we studied in hook’s coupling the input and output speeds are not uniform but in efficient power transmission we always require uniform speed at outlet that’s why double hook joint comes into play. As name implies a double hook joint has two hook’s joint or universal joint which are connected by means of an intermediate shaft. For obtaining uniform angular speed or constant velocity ratio the input and output shafts always make equal angle with the intermediate shaft and the forks used in the intermediate shafts should rotate in the same plane because if the angular misalignment between input-output and the intermediate shafts is equal then the input and output shafts will always remain in correct angular alignment. So by using double hook’s coupling we can obtain uniform angular velocity at driven shaft when both the shafts have intersecting axes.

4. Rigid Coupling:

Rigid coupling is used where the axes of both the shafts are collinear. Rigid couplings are simple and less costly, but the major drawback of this type of coupling is that they cannot tolerate any kind of small misalignment between the axis of the shafts. Different types of coupling come under this category some are them are as follow:

Muff coupling

Clamp coupling

Flange coupling

a.) Muff coupling:

This coupling also known as sleeve coupling because it has sleeve or a kind of hollow cylinder. The driven and driving shafts are joined in the sleeve by means of a key. Generally sunk key is used in muff coupling which makes it simplest coupling among all. The force transformation takes place from driving shaft to key then from key to sleeve and then to the driven shaft by means of key. Shearing force between the key and shaft is responsible for the power transmission. Key should be the weakest part in any kind of coupling. Muff coupling used for small diameter shafts. The power transmission shafts should not have diameter more than 70-80mm. This is the type of rigid coupling so always proper alignment is required otherwise joint will fail. It can’t absorb any kind of jerk and vibrations so that the operation should be free from any vibration.

b.) Clamp coupling:

Clamp coupling is the modified form of the muff coupling and also known as split muff coupling i.e. it has sleeve which is divided into the two half that’s why it is known as split muff coupling. The two-split portion of the sleeve are clamped together using nuts and bolts. Both the shafts tightened together into the clamps, 4 or 8 nuts are used to tight the shaft into the split muffs. There is always some clearance in between the both muffs at centre line for the tightening space of the nuts. The torque is transmitted from one shaft to another by means of friction between the sleeve and the shafts periphery. A key is also placed in between the sleeve and shaft for the proper connection which is necessary for the torque transmission. Both friction and shear force between key and shaft are responsible for the torque transmission. The major difference between the clamp coupling and muff coupling is the way of torque transmission. In muff coupling torque is transferred by means of shear forces of the key where as in clamp coupling torque is transmitted by the two ways one is by means of friction between the sleeve and shaft and other by shear resistance between key and shafts. This is also a type of rigid coupling so that it can’t tolerate any jerk and vibration, but this is easy in construction and making connection between two shafts is easy. This coupling is not suitable for high speed applications. Its applications in line shaft power transmissions.

c.) Flange coupling:

As name implies flange coupling has flanges for the joining of both the shafts. It is another type of rigid coupling so all the conditions are also applicable here like proper alignment of both the shafts and connection should not have any kind of vibrations and jerks. Here we use two flanges one is for input shaft and the other is for the output shaft. The shafts are joining with the flanges by means of keys and both the flanges are connected together by using nut and bolt connections. Key is responsible for the power transmission in this coupling. The flanges have spigot and recesses at the centre for the proper connection. The proper alignment is always required for the good connection. This is used for high speed applications because it has proper and tight connection by means of flanges and nut-bolts. It is widely used in power transmission because easy to assemble and simple in construction.

5. Flexible coupling:

This is another category of coupling. As name suggest it has flexible connection between the input and the output shaft because it is very difficult to make a proper aligned connection between the two mating shafts and there are various reasons for the misalignment between the two shafts such as deflection of shafts, thermal expansions etc. so to remove all such causes flexible coupling comes into the play. Flexible coupling able to tolerate small eccentricity between the two shafts and in flexible couplings some kind of flexible element know as bush are used as extra part which helps in reduction of vibrations and jerks so which make it to use in little vibration conditions. We can say that flexible couplings are the best for the power transmission between two shafts. The cost and the complex construction is the main disadvantage of this coupling.

Bush-Pin flexible coupling is one of the most famous type of flexible coupling. In this bushes are used for absorbing the shocks and vibrations. The bushes are made up of the flexible elements like rubber. The construction of bush-pin coupling is almost same as the flange coupling as we discussed above the only extra part is bushes.  These bushes are mounting in between the flanges and the shafts. Bushes are not only able compensate the small eccentricity between the two mating shafts as well as provide a tight connection between flange and shaft due to this reason Bush-Pin coupling used for high torque transmissions.  0.1 to 0.5 mm eccentric distance can be easily compensated by using flexible bushes. The angular misalignments are also tolerated by using this coupling. Here also the shear forces between the key and shaft is responsible for the torque transmission. The extra part leads to increase its cost and complexity of constructions which is the only drawback of such coupling.

This is all about main types of couplings. If you have any query regarding this article, ask by commenting. If you like this article, don’t forget to share it on social networks. Subscribe our website for more informative articles. Thanks for reading it.

Sharing is Caring :)-

For more Pin Bush Couplinginformation, please contact us. We will provide professional answers.