Lynnuo SWC Series Universal Coupling

Lynnuo chooses the best stainless steel raw materials when purchasing Universal Coupling materials. Our Universal Coupling production equipment uses the latest technology, whether it is drilling or heat treatment. The best materials and equipment can extend the life of Universal Coupling accessories.

Please tell us your Universal Coupling needs, or take pictures of the Universal Coupling you have used, measure the corresponding size to us, we will provide free drawings and provide you with our most suitable Universal Coupling.

Each of our Universal Couplings is customized, and we will try our best to meet your every need!

Universal Coupling | The Ultimate FAQ Guide

Introduction

In this article, you will learn everything about universal couplings.

This article will guide you from basic to fundamentals aspects of universal couplings. When you are done reading this article, you will know about the definition, working mechanism, use, advantages, disadvantages, price, and other features of universal couplings.

Universal couplings transfer angular momentum from one part of a machine to another. They are almost used in every sector of life.

Let us learn in detail about universal couplings!

FAQs

1) What Is A Universal Coupling?

Universal couplings are basically rods that connect one part of a machine to another and transfer angular momentum.

The shafts that are connected may or may not be inclined with each other.

Universal couplings are widely used in industries and automobiles. They come in all sizes, lengths, nominal torques, and other features.

Universal couplings can transfer a large number of angular momentums very efficiently. They are very durable.

Universal couplings are also known as universal joints( U-joints ), Cardan joint, and Cardan shaft.

2) Why Do We Use Universal Couplings?

All the machines have at least two components in common; the first is the driving component( motor, engine, e.t.c ), and the second is the driven component.

For the working of a machine, driving and driven components must be connected. But sometimes they are far away and not inclined with each other.

That is where universal couplings come. Universal couplings act as a permanent joint between a driving shaft and a driven shaft, even if they are not inclined to each other.

Universal couplings are very critical in connections due to the following properties;

• Are very durable
• Are easily replaceable
• Are simplistic in structure
• Have a simple working mechanism
• Can even connect non-parallel shafts
• Can transmit a high amount of torques

3) How Does A Universal Coupling Work?

The working mechanism of a universal coupling may seem complicated, but it is the simplest.

In order to understand it, let us first learn all the essential components of a universal coupling;

• Yokes or Flange York
• A cross shaft is also known as Cardan joint

Now back to the working mechanism, the two yokes are close to each other. A cross shaft passes through the holes of yokes and connects two yokes.

When we rotate one end, the other end also rotates due to hinges even if they are not inclined.

The flange is present at both ends of universal coupling. You can connect the driving shaft at one end and the driven shaft at another end of the universal coupling. When you rotate the driving shaft, the rotatory motion will pass through universal coupling and transmit to the driven shaft. Flanges will allow rotation even if the shafts are not inclined.

This is the basic working mechanism you will see in all universal couplings.

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4) How Do You Produce A Universal Coupling?

We at LYNNUO manufacture your universal coupling in 7 steps;

• Designing
• Forging
• Drilling
• Assembling
• Testing
• Welding
• Painting

Step 1 Designing: In our factory, when we receive customer requirements, our engineers design a drawing and send clients to confirm.

Step 2 Forging: Once designed, we purchase raw materials according to your needs. Then make the first forging. And send it out to quench to remove impurities and make it durable.

Step 3 Drilling: Once forged, we drill all kinds of holes such as a central hole, flange holes, and others in your universal coupling. We also smooth your universal coupling in this step.

Step 4 Assembling: Once drilled, we connect flange york with a cross shaft. We also connect the splined shaft with the flange yorks by welding.

Step 5 Testing: In this step, we run the universal coupling on a machine to ensure all parts are balanced and working perfectly. We also perform a balance test to ensure a stable working.

Step 6 Welding: We connect both splined shafts with the main rod and weld them in this step. Finally, your universal coupling is ready except for painting.

Step 7 Painting: At last, we paint with the premium quality paint of your desired color. Painting is vital as it protects the universal coupling from rusting, elongating the lifespan of your universal coupling.

5) What Are The Applications Of Universal Couplings?

Universal couplings are used in industry. Because all machines need to forward their power to the driven part.

Universal couplings forward torque from driving shaft to driven shaft very efficiently, even at non-parallel angles.

Universal couplings are mostly used in the following machines:

• Aircraft
• Ordnance
• Tool drives
• Pump System
• Marine Drives
• Crane System
• Gondola Drives
• Loading Vehicle
• Paper Machines
• Rubber Machine
• Medical devices
• Mining Machines
• Sewing machines
• Textile Machinery
• Rolling Machinery
• Straightening Machines
• Windmill Test Machines

We at LYNNUO can manufacture your universal coupling in any size, shape, material, and other requirements. Just let us know!

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6) How To Select A Universal Coupling?

Selecting a universal coupling for your machine is a bit of a complicated process.

Many factors to consider during the selection of universal coupling;

• Calculated Torque
• Bearing Life
• Rotation speed
• Misalignment angle
• Maximum Bending Moment

Calculated Torque: This is the maximum torque you can put on the universal coupling.

or Where,

Tc = Calculated Torque, N•m;                                  T = Theoretic Torque, N•m;

PW = Driving Power, kW;                                         PH= Driving Power, hp;

n = Operating Speed, rpm；                                    K = Service Factors (See Table )

Bearing Life: Bearing life depends upon transmitted torque, rotation speed, and misalignment angle. You can contact us to find your specific bearing B-10 life. The main goal is to achieve a B-10 life of more than 5000 hours.

where

LN= Service life, hrs;

n = Operating Speed, rpm;

β= Joint Operating Angle In Operation, (°);

K1= Prime Motor Factor;  Electric Motor:  K1= 1  or Diesel Generator:  K1= 1.2

KL= Bearing Capacity Factor (See Table);

Lmin = Min. Bearing Life, hrs;

T = Theoretical Torque, kN•m.

Rotation speed: For most mill applications, if the rotational speed is less than 300 rpm, there is no need to concern. But suppose the joint diameter of the shaft is 390mm or less. In that case, Formulas (5) and (6) should be used to check the maximum speed in addition to the considerations of torque and bearing life.

Where,

Misalignment angle: When there are simultaneous horizontal and vertical angular misalignments on the Cardan shaft, the composite deflection angle is calculated using Formula (6)：

Where,

β=Composite Deflection Angle, (°);

=Horizontal Deflection Angle, (°);

=Vertical Deflection Angle, (°).

Bending Moment: Bending moments occur in the connecting shafts as a function of operating misalignment angle and driving torque. Bending moment causes a load on the supporting bearings. You can find the maximum bending moment using the formula:    M = T tan λ

where

M = Maximum Bending Moment

T = Operating Torque

tan λ = operating angle

                                                 Bearing Capacity Factor ( KL )

7) How To Install A Universal Coupling?

All of LYNNUO universal couplings are easy to install. They all come with a guidebook to ensure easy installation. All the universal couplings are delivered fully assembled.

You can also follow the below steps to install a universal coupling;

• Raise universal couplings in a horizontal state using only hemp or nylon ropes.
• The forkhead at both heads of the spline shaft and spline sleeve should be in the same phase.
• Clean any grease, rust, anti-rust spray, and dust from the flange mounting surface.
• Put bolts in the flange from the driven shaft side of the flange and tight them from the universal coupling side of the flange.
• Use grade 10.9 high strength bolts and grade 10 nuts for flange connection.
• Apply MoS2-free grease spray on bolts threaded portion before screwing nuts.
• Use a torque wrench to tighten the bolts to a specific value. See the table below for more information.

8) How Long Do Universal Couplings Last?

Universal couplings are very durable and can last a minimum of 5000 hours easily.

Many factors affect the lifespan of universal couplings, such as;

• Using Environment
• Maintenance period
• Operator Experience
• Manufacturing quality
• Working hours per day

Using Environment: Using universal coupling in a shady, clean, and moisture-free environment increases universal couplings’ lifespan.

Maintenance period: Checking, lubricating, cleaning the universal coupling can double its lifespan. Replacing worn-out or broken parts can save the machine from a severe accident.

Operator experience: An experienced operator will prevent any kind of jamming. Thus, increase the lifespan of universal coupling by ensuring smooth running.

Manufacturing quality: Universal coupling lifespan depends upon its material quality, design, and manufacturing process. Good quality universal couplings survive longer than bad quality couplings.

Working Hours per day:  More you use your universal coupling per day, the more it will be worn out per day. More sooner, you will need to repair or change your universal coupling.

Normally, a universal coupling can run for 5000 hours. You can calculate your universal coupling life span according to your use per day.

Lifespan = 5000/ working hours per day = ________Days

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9) How To Maintain A Universal Coupling?

All of our LYNNUO universal couplings are manufactured that are easy to maintain.

You can maintain your universal coupling in the following 4 steps;

• Checking
• Fixing
• Lubrication
• Cleaning

Checking: Keep checking your universal coupling periodically. You can look for these aspects during checking:

• Look for any abnormality
• Listen for any weird sounds
• Check wear condition of a cross shaft
• Examine wear conditioning of bearings outer ring
• Measure short cylindrical roller surface radial clearance for wearing calculations
• Look for indentation, pitting, peeling, cracking, and other phenomena at contact surfaces.
• Check spline teeth sliding flexibility.

Fixing: Repair or replace any damaged part on the spot to prevent further damage and ensure smooth running.

Lubrication: As universal coupling is a moving part, lubrication should be done to prevent unnecessary friction at moving ends.

• Bearings
• Spline

These parts must be lubricated periodically.

In mill operation, lubrication is done once every 3 months.

For operation, lubrication is done once every week for 6 months.

For stable working conditions, lubrication is done once every half a year.

Cleaning: Clean the universal coupling from the outer side periodically. Cleaning universal coupling every part from the inside is also necessary.

You can disassemble the universal coupling in the following steps:

• Remove all dirt or anything from universal coupling
• Mark the coupling parts with white part to remember alignment
• Prevent any dust or foreign agent from entering the bearings or spline

Clean all parts. Bearings and cross shafts must be cleaned in a separate container with separate liquid. Check the parts carefully after cleaning. Repair or replace any damaged parts.

For assembling, join the parts in reverse order of disassembly. Follow the white markings for perfect alignment. The fork heads should be in the same phase. Tighten all bolts with torque wrench according to defined pre-tightening torque.

10) How Much Does A Universal Coupling Cost?

Universal couplings price depends on factors such as size, shape, material kind, load capacity, and others.

The price of a universal coupling directly depends upon its load-carrying capacity; more load carrying capacity means more cost.

LYNNUO universal couplings are of premium quality, and their prices range from $100 to $40,000 and more.

We sell all of our products at wholesale prices. We are a factory, and we are one of the biggest suppliers of universal couplings in China.

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11) What Are The Disadvantages Of Universal Couplings?

Universal couplings are very efficient in forwarding angular momentum from the driving shaft to the driven shaft, even at misaligned angles.

But universal couplings have some disadvantages also, which are given below;

• Maintenance is required periodically
• Insufficient lubrication can cause wear of parts much sooner
• The driving shaft and driven shaft have different rotation speeds at misaligned angles
• Operating at maximum torque exert pressure on bearings, resulting in accidents

But all these disadvantages can be handled with proper maintenance and a little care while operating.

12) What Is The Maximum Load Capacity Of Universal Couplings?

Universal couplings load capacity depends upon the following factors;

• Material used
• Weight
• Length
• Diameter
• Deflection angle
• Other factors

With the increase of load capacity, these factors will also rise.

LYNNUO universal couplings come in many load capacities.

You can see the below chart to get an idea about LYNNUE universal couplings load capacities;

13) Does The Environment Affect The Working Of Universal Coupling?

Universal couplings are made of metal and other materials, they are affected by the environment.

There are many environmental factors that can affect the working of any universal coupling;

• Dust
• Moisture
• Temperature
• Other factors

You must take precautionary measures to save your universal coupling from environmental degradation;

• Lubricate parts regularly
• Clean universal coupling regularly
• Save coupling from extreme moisture or rainy conditions
• Select a suitable coupling in accordance with working environment temperature

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14) How Many Parts Are Required For The Assembly Of Universal Coupling?

The universal couplings have a very simple yet tricky structure. All your universal couplings parts are manufactured from scratch in Lynnuo.

The universal couplings are assembled from the following parts;

• Extension Pipe
• Cross Shaft or Cross U-Joint
• Flange
• Hinges or Yokes
• Splined shaft
• Earhole for Cross U-Joint
• Sleeve Shaft

Cross Shaft: They allow all the complex movements, even at misalign angles. They provide flexibility to the shaft.

Flange: It connects universal coupling with a driving shaft at one end and a driven shaft at another end.

Hinges or Yokes: Two yokes hold one cross joint and allow the free movement of a cross joint in them.

Splined Shaft: It connects the hinge mechanisms with the central rod of universal coupling.

Each part is necessary for the proper functioning and durability of universal coupling.

15) What Is The Difference Between Rigid And Flexible Universal Coupling?

The main difference between a rigid and flexible universal coupling is their structure. Both have their own significance in different applications.

You can see the chart below to differentiate between a rigid and flexible universal coupling;

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16) What Types Of Universal Couplings Does LYNNUO Produce?

We at LYNNUO produce many kinds of universal couplings, both rigid and flexible universal couplings.

LYNNUO is manufactured in various sizes, shapes, load capacities, weight, and other features.

You can see the chart below to get an idea about the LYNNUO SWC series universal couplings;

17) Can You Customize Your Own Universal Coupling?

Yes, you can customize your own universal couplings. We are a factory that can manufacture your universal couplings from the forging process.

You can customize your coupling in any size, shape, load capacity, weight, material kind, and other features.

You can see the chart below to customize your universal coupling;

18) Does LYNNUO Test Its Universal Couplings When Ready?

Yes, all of LYNNUO universal couplings pass many tests before shipment.

We at LYNNUO ensure that our universal couplings not only look good but also function properly.

All of LYNNUO universal couplings pass these tests before delivery;

• Manual Inspection after every step of manufacturing
• Automatic Test
• Dynamic Balancing test
• Final Inspection after paint

Manual Inspection: Every universal coupling is inspected manually to ensure no error after every stage of manufacturing.

Automatic Test: After assembly, a whole universal shredder is run on a machine to ensure proper working.

Balancing Test: Every part must pass the balancing test to ensure balance equilibrium.

Final Inspection after painting: After painting, every universal coupling is inspected manually before packing.

By doing this, we ensure that our clients receive premium quality universal couplings.

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19) What Is The Delivery Time Of Your Universal Coupling Order?

Because every universal coupling is customized, we do not have any stocks.

We are always in production round the year. All of our products are manufactured for real-time clients.

If you are urgent want your order, then delivery time will depend on the following factors;

• Order quantity
• Your Universal coupling Specifications

Your Universal coupling Specifications: If you choose an existing model, it will take 10 to 15 days. But if you decide on a new model, then it will take 30 to 90 days.

Order Quantity: More Order Quantity means more manufacturing period, and delivery time will increase accordingly.

If you have emergency orders, do not hesitate to tell us. We will improve our working hours to meet your order deadline.

20) Why Are LYNNUO Universal Couplings Better Than Others?

We have more than 35 years of experience in universal coupling manufacturing. We are one of the biggest manufacturers of couplings in the whole of China.

LYNNUO Universal couplings are better than others due to the following features;

• Are budget-friendly
• Are only manufactured on order, no old stocks.
• Are specifically designed according to client needs
• Are manufactured with the best quality alloy
• Are inspected after each step of production
• Are polished and painted carefully
• Must pass quality tests
• Have ISO9001 and TS16949 quality certificates
• Are inspected before shipping
• Are packed carefully
• Have no minimum order quantity limitations

We have a long term contract with many industries;

• Bao steel Group Corporation
• China First Heavy Industries
• Sao guan Hydropower Station
• Anshan Iron and Steel Corporation
• Capital Steel & Iron Corporation
• Large-scale crane factories
• Other industries

We are a fast-growing industry. We care about our customers. All of our universal couplings are of premium quality and budget-friendly.

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