Coupling and universal joint replacement technology by Twin Spring Coupling
Frequently Asked Questions
1. What kinds of flexible couplings can you replace.
We can replace most coupling units, our design is a hybrid of both types of traditional coupling units.
- The Universal Joint which comes from numerous manufacturers across numerous industries like Spicer, Moog, SKF, GMB, Neapco, in the Automotive industry. In agriculture there are Walterscheid, Weasler and Bondioli, finally in Industrial there is LoveJoy, Belden, Boston Gear, SIT, McMaster Carr.
- In industrial coupling there are 3 types of couplings, Beam Couplings, Bellows Couplings and Jaw Type Couplings, manufacturers include KTR, SIT, Huco, Altra, Belden, Tsubaki, R+W, Lovejoy, TB Wood, Guardian Couplings, Ruland, Helical,McMaster Carr
Not only can we swap out most of these couplings with a direct fit with the spline and key but also offer improved performance and reliability.
2. Why would Twin Spring’s Coupling be better than a universal joint?
Twin Spring Coupling
Twin Spring Couplings are made as a one piece coupling, made with a set of counter-wound springs, with no bearings that need to be constantly greased or replaced through wear or contamination, thus saving money on annual maintenance. The one piece design means no yokes that can crack so that means more savings. The coupling gets its flexibility from the two counter wound springs, making it more flexible than a universal joint and the two springs thickness allows for high torque, comparable to that of universal joints. The springs help in a number of ways 1. No bearings to get the larger angle of misalignment traditionally seen in a cardan joint or cv joint. 2. The springs can take more punishment than a standard uni joint without the bearing cross or yokes breaking, making them ideal for offroad, farming and mining use. All wrapped up in one coupling using the same splines that universal joints use whether it be 31 spline, 32 spline, keyway, square/hex or non keyway.
A universal joint is flexible due to the bearing cross which contains 4 bearings, while this is what gives its flexibility but it is also where the maintenance is required as well. The bearings all need to be constantly kept supplied grease otherwise the ball-bearings inside the bearings will over heat with use and seize requiring it to be replaced, this seizure can also lead to the universal Yokes (which connect the misaligned shafts together) to crack, again needing to be replaced. The greasing is only one part of the maintenance, these bearings should only be used at a few degrees out of alignment otherwise the ball-bearings start to rub against the side of the bearing race, leading to side wall wear and failure. The third downside to a universal joint is the environment its being used in, as again the bearings being delicate precision pieces of equipment are easily contaminated with water, mud, dust and dirt. The universal joint has to be covered by a rubber boot otherwise any contaminates lead to rapid failure of the bearings.
Outside of the bearing cross are the Universal joint yokes, these hold the bearing cross in place and while a cast steel product are more delicate around where the bearings are inserted, so this means that these yokes have a tendency to crack due to 1. bearing seizure 2. Joint being used at high angles of misalignment.
3. How is Twin Spring coupling better than the flexible couplings used in Industrial machinery ?
Industrial machinery is machinery that does the same thing over and over again with little to no variation. Industrial machinery is built to have only very small angles of misalignment, as the equiment is in use 24/7/365. These small angles means these couplings usually dont require lubrication making them a longer lasting flexible coupling.
The only variation and issue becomes when the couplings have to be used at the extremes of the angle of usage, at most 4 degrees. This means any equipment like conveyor belts or any equipmet where additional movement due to variations in weights means these coupling tend to wear out quicker.
The designers of this equipment dont have much choice in couplings to use on their equipment because the only option in the past has been a universal joint but with the increased lubrication and bearing replacement schedule normally rules them out in use in equipment like this as the cost of its use and maintenance far outways its usefulness.
This is where Twin Spring coupling is a great new alternative, the no bearings design means it compares quite favorably with those of beam, bellows and Jaw type couplings typically used in industrial machinery, ad4. ding the benefit of increased angle of misalignment which traditional couplings CANNOT do, makes Twin Spring an ideal replacement for these couplings. Being available in all the industry standard splines, keyways and configurations means Twin Spring Coupling is a relatively easy retro fit, and increased torque capacity means Industrial OEM’s can now redesign their equipment to make it more efficient and take advantage of our coupling units.
4. Can your couplings work with Farm equipment, tractors, attachments, PTO’s?
Yes we do, the standard universal joint whether its on road, offroad, mining, agriculture or marine are all the same design. The more abuse from offroad use has meant manufacturers like Weasler, Waltherscheid, Bondioli and Neapco all using the same technology have increased the size of the universal joint to make it work in these hostile environments.
Water is one of the biggest problems for bearings, as if water or mud pentrates the bearings they rust and will seize and need to be replaced. Outside of that, a universal joint used say on a farm gets alot more work in a short period of time This means constant greasing to ensure the bearings dont run out of grease, overheat seize and need to be replaced. The average universal joint in a PTO attachment needs to be regreased every 8 hours, 8 hours for most farmers means less than once a week.
The design again of the universal joint means 3 pieces (bearing cross and 2 yokes) means that anything can go wrong with any of these pieces and the equipment cant be used.
Twin Spring Coupling is ideal for the farmer, 1 piece design, no bearings means no broken yokes, no bearings to replace or constantly grease. Adding to that the twin spring design means our coupling is more flexible than one of these off road uni joints and able to take the abuse of off road vehicles more than a uni joint as well. No bearings means water, mud, dust and dirt wont effect the coupling and with it able to handle 95HP @1000 RPM means it can work with most farm equipment like PTO based attachments, headers, combines etc.
5. Mining is tough on couplings, how do yours handles it?
Mining is where Twin Spring Coupling started, a coal miner in Australia was sick of replacing universal joints because they kept getting infiltrated with water and coal dust and were constantly being replaced.The downtime of equipment The hostile work environment