Q&A Coupling
The following is a list of answers for frequently asked questions from our customers. Select questions to view the answers.
Words
ECHT-FLEX Coupling - Basic Instructions *NES Series is not affected.
ECHT-FLEX Coupling - Design Specifications *NES Series is not affected.
Roller chain coupling
Q1 | Why do the ECHT-FLEX couplings allow lube-free, non-backlash operation? | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A1 |
The ECHT-FLEX Coupling transmits power using the friction force of the disk tightened with the reamer bolt and U nut. Consequently, it is free from wobbling or sliding and does not require lubrication. Back to questions |
|||||||||||||||||||||
Q2 | What happens when a torque greater than the allowable torque is applied? | |||||||||||||||||||||
A2 |
The allowable torque is determined from the friction force of the disk tightened with the reamer bolt and U nut. A load greater than the allowable torque may cause a slip, resulting in damage to the coupling. Note that the allowable torque may decrease depending on the tightening method. Refer to the catalog for details. |
|||||||||||||||||||||
Q3 | What is the allowable ambient temperature range of the ECHT-FLEX Coupling? | |||||||||||||||||||||
A3 |
It can resist temperatures from -30℃ to +200℃.
|
|||||||||||||||||||||
Q4 | Can you make a stainless steel type or electroless nickel-plated type to prevent rust? | |||||||||||||||||||||
A4 |
We have the electroless nickel-plated type as standard to provide a simple form of rust-proofing intended mainly for clean room applications. A stainless steel type is also available. Contact us for details. Back to questions |
|||||||||||||||||||||
Q5 | Is it possible to paint the ECHT-FLEX Coupling? | |||||||||||||||||||||
A5 |
Painting the ECHT-FLEX Coupling is not recommended because the outer diameter changes according to the thickness of the paint coating, which prevents proper centering. Contact us if painting is absolutely necessary. Back to questions |
|||||||||||||||||||||
Q6 | What happens when the U nut is tightened without using a torque wrench? | |||||||||||||||||||||
A6 |
The allowable torque shows a value when the U nut is tightened with the specified tightening torque. Consequently, tightening without using a torque wrench may cause an accident such as a slip due to insufficient tightening or a deformation of parts due to excessive tightening. Be sure to use a torque wrench and tighten the nut with the specified tightening torque. Back to questions |
|||||||||||||||||||||
Q7 | Is there a specific direction in which to insert the reamer bolt during assembly? | |||||||||||||||||||||
A7 |
The reamer bolt can be inserted in either direction. Note that washers A and B have a specific direction. Refer to the instruction manual or catalog for assembly. Visit our website for a 3D video on assembly methods. |
|||||||||||||||||||||
Q8 | After the coupling is assembled, the disk wobbles along the shaft. Is something wrong? | |||||||||||||||||||||
A8 |
If any thrust load is being applied to the coupling while the U nut is tightened, the disk will wobble along the shaft. We call this the "wobbling phenomenon." We do not recommend its use in this state because excessive stress is being applied to the disk. When the wobbling phenomenon occurs, loosen the U nut once and assemble the coupling without a thrust load being applied. This stops the phenomenon. Back to questions |
|||||||||||||||||||||
Q9 | Is the reamer bolt compatible with commercially available products? | |||||||||||||||||||||
A9 |
No, the reamer bolts for the ECHT-FLEX Coupling are dedicated, special design products and are not compatible with commercially available products. If you need the reamer bolts, order them via your dealer. Back to questions |
|||||||||||||||||||||
Q10 | Are the parts compatible? | |||||||||||||||||||||
A10 |
The hubs, disks, and bolts used in the single type, spacer type, and long spacer type are common and compatible. Back to questions |
|||||||||||||||||||||
Q11 | What is the allowable parallel eccentricity for the single type? | |||||||||||||||||||||
A11 |
The single type absorbs angular eccentricity only and does not absorb parallel eccentricity. As a result, this type is recommended only for the application where precise centering for NC machine tools or servomotors can be made. For general applications, use a spacer type. Back to questions |
|||||||||||||||||||||
Q12 | Is the dynamic balance adjustment necessary for high-speed applications? | |||||||||||||||||||||
A12 |
If vibration or noise presents a problem, a balance adjustment may be required after the equipment is assembled. If you specify the balance quality grade and rotation speed, we can check the adequacy of the adjustment. Back to questions |
|||||||||||||||||||||
Q13 | What are the points we should be careful about when selecting the long spacer type? | |||||||||||||||||||||
A13 |
When using the long spacer type at high speed, you need to check the rotation speed to avoid a critical speed. For the selection, see the catalog and confirm that the distance between the hub faces (distance J) and the rotation speed of the model number are within the limit. Contact us for details. Back to questions |
|||||||||||||||||||||
Q14 | What is the maximum length of the long spacer type you make? | |||||||||||||||||||||
A14 |
Long spacer type Echt-Flex Coupling can be manufactured with a hub face distance up to 6,000mm (for NEH41W sizes and smaller). |
|||||||||||||||||||||
Q15 | Can we use the coupling in a vertical mounting layout? | |||||||||||||||||||||
A15 |
Yes, you can use the standard spacer type and single type. For the long spacer type, if the distance between the hub faces (Distance J) exceeds the values in the following table, special construction is required to support the weight of the coupling. Contact us for details.
|
|||||||||||||||||||||
Q16 | What is the gear coupling-compatible G type? | |||||||||||||||||||||
A16 |
Having the same overall length and hub length as gear couplings, the G type coupling replaces the current gear coupling without any extra work. The replacement with the ECHT-FLEX Coupling eliminates the need for lubrication and reduces maintenance work.
|
|||||||||||||||||||||
Q17 | The Power-Lock type uses the EL series as standard. Can we use the other series of Power-Lock for mounting? | |||||||||||||||||||||
A17 |
Yes, you can. Note that you should check the diameter of the hub to determine whether it can withstand the surface pressure generated by the Power-Lock. For general use, we recommend the KE series which supports a wide range of shaft tolerances and the TF series for small diameter hubs. Back to questions |
|||||||||||||||||||||
Q18 | Can we use the Power-Lock type for a hollow shaft? | |||||||||||||||||||||
A18 |
Contact us if you want to use the hollow shaft with a Power-Lock. Design considerations need to be made regarding the material strength of the hollow shaft and its internal diameter. Back to questions |
|||||||||||||||||||||
Q19 | Is it possible to match the keyway angles on the right and left sides? | |||||||||||||||||||||
A19 |
When accurate matching of the keyway angles is required, please specify the "matching keyway angle type" when placing your order. In this case, we make the coupling with a maximum angle difference of ±2 degrees. When higher accuracy is required in matching keyway angles, the Power-Lock Type is recommended. Back to questions |
|||||||||||||||||||||
Q20 | Do you accept orders for taper shaft bore machining? | |||||||||||||||||||||
A20 |
Yes, we can make bores of Φ16 (1/10 taper) and Φ11 (1/10 taper) for servomotor shafts. For other dimensions, we can make them if you provide the taper gauge. Back to questions |
|||||||||||||||||||||
Q21 | What is the meaning of "J" such as CR5016-J marked on the roller chain coupling? | |||||||||||||||||||||
A21 |
The roller chain coupling consists of a body and a housing. We add a suffix "H" for the body and "K" for the housing to their model numbers to sell them separately. The marking of "J" on both body and housing is not the model number but indicates compliance with the JIS standard. Model number examples ・Body: CR5016H ・Housing: CR5016K Example of the marking on the product ・Common to body and housing: CR5016-J Back to questions |
|||||||||||||||||||||
Q22 | Can we purchase the parts for the roller chain coupling? | |||||||||||||||||||||
A22 |
The following parts are sold individually.
|
|||||||||||||||||||||
Q23 | Is it possible to use the standard Tsubaki RS roller chain as the chain for the roller chain coupling? | |||||||||||||||||||||
A23 |
Yes, it is possible because the dedicated chain of the coupling is designed based on the two-row RS roller chain. Note, however, that the dedicated roller chain can be attached/removed with the insertion/extraction of a single joint pin. The two-row standard roller chain is jointed with joint links. Since this affects the efficiency of the assembly, the use of the dedicated roller chain is recommended. The model number indicates the following:
|
|||||||||||||||||||||
Q24 | Which is used to fasten the joint pin, a clip or a cotter pin? | |||||||||||||||||||||
A24 |
Since the chain is based on the Tsubaki RS roller chain, the method is the same as the joint link of the RS roller chain. ・CR3012H to CR6022H: Clip ・CR8018H to CR20022H: Cotter pin Back to questions |
|||||||||||||||||||||
Q25 | Please provide the name of a commercially available oil seal for the housing. | |||||||||||||||||||||
A25 |
The oil seal is a dedicated part and is not commercially available. Back to questions |
|||||||||||||||||||||
Q26 | Is it possible to mount the housing provided by another company to Tsubaki's chain coupling body, or vice versa? | |||||||||||||||||||||
A26 |
Each company has its own original design. Since the dimensions are always different, mounting is impossible. Back to questions |
|||||||||||||||||||||
Q27 | Do you sell dedicated grease? | |||||||||||||||||||||
A27 |
We don't sell dedicated grease. Use commercially available products. The following products are recommended:
Recommended lubricating grease for stainless series specific application |
|||||||||||||||||||||
Q28 | Is the oil seal okay on only one side? | |||||||||||||||||||||
A28 |
One side is a tight fit, and the oil seal side is designed to absorb misalignment and prevent grease leakage. Back to questions |