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Brand: KTR
KTR RIGIFLEX-N Steel Laminae Coupling
Description
Torsionally stiff steel laminae coupling for pumps, compressors and turbines
The KTR RIGIFLEX-N is an all-steel laminae coupling. Layered, waisted steel laminae sets are fixed to the hubs and flanges with positive-locking dowel screws, so torque is transmitted without backlash while the laminae flex to take up axial, radial and angular shaft displacement. KTR positions the series for pumps, compressors and turbines to API 610 and API 671, where long shaft distances and high rated torques are typical.
The data below is from KTR operating and assembly instructions KTR-N 47410 EN (edition 16) for type A (sizes 35 to 408) and type A-J.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer | KTR Systems GmbH, Rheine, Germany |
| Coupling type | Torsionally stiff, backlash-free steel laminae coupling |
| Types in KTR-N 47410 | Type A (size 35 and sizes 50 to 408) and type A-J |
| Sizes | 35, 50, 65, 75, 85, 110, 120, 140, 160, 166, 196, 216, 256, 306, 346, 406 and 168, 198, 218, 258, 308, 348, 408 |
| Rated torque TKN | 130 Nm (size 35) to 210,000 Nm (size 406); 25,000 Nm (size 168) to 280,000 Nm (size 408) |
| Maximum torque TK max. | Twice the rated torque, for example 260 Nm (size 35) and 560,000 Nm (size 408) |
| Fatigue torque TKW | Half the rated torque, for example 65 Nm (size 35) and 140,000 Nm (size 408) |
| Maximum speed | 23,000 rpm (size 35), 9,000 rpm (size 110), 4,600 rpm (size 216), 2,500 rpm (sizes 406 and 408) |
| Shaft distance DBSE, type A | 100, 140, 180, 200 or 250 mm depending on size; other distances on request |
| Axial displacement Ka | 1.2 mm (size 35), 2.1 mm (size 85), 4.5 mm (size 216), 7.5 mm (size 406); 2.6 to 5.0 mm for sizes 168 to 408 |
| Angular displacement Kw, per laminae set | 0.7 degrees (sizes 35 to 406); 0.5 degrees (sizes 168 to 408) |
| Temperature classes for explosive atmospheres | T4: -40 °C to +110 °C; T5: -40 °C to +75 °C; T6: -40 °C to +60 °C |
Choosing size and shaft distance
Selection starts from the rated torque and the speed, then from the shaft distance. A longer DBSE, for example 250 mm instead of 100 mm, gives a larger permissible radial displacement, because the displacement is taken up by the two laminae sets. In the KTR table the radial displacement for size 35 is 0.90 mm at DBSE 100 mm and 1.40 mm at 140 mm. The torque figures refer to the laminae set only; the transmittable torque of the shaft-hub connection must be checked by the user.
Laminae couplings are normally balanced, and the instruction asks for the balancing markings on assembly-balanced couplings to be matched. For axial alignment the DBSE dimension is decisive, so it has to be set exactly on assembly; KTR describes the procedure in the assembly chapter.
Installation notes
KTR lists the screw tightening torques for each size, up to 3,300 Nm for the largest couplings. Alignment limits apply to axial, radial and angular shaft displacement together; in explosion group IIC only half of the table values are permitted. Couplings with attachments that can generate heat, sparks or static charge, such as brake drums, brake disks or torque limiters, are not permitted in explosive atmospheres without a separate analysis.
Documents and quotation
The attached PDF is the KTR operating and assembly instruction for RIGIFLEX-N, which holds the dimension and torque tables. For an enquiry send the machine data, rated power and speed, shaft diameters, required shaft distance, whether API 610 or API 671 applies, balancing grade and ambient temperature. Related drive machinery is listed under Pumps and Electric Motors and Gear Units.
Datasheets & Documents
- Operating Instructions KTR RIGIFLEX-N operating and assembly instructions KTR-N 47410 EN (edition 16) Download
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About brand
KTR is a German manufacturer of shaft couplings and related drive components, based in Rheine. The company was founded in 1959 and its products are used in machine building, pumps, power transmission, hydraulics and heavy industry. Seven Star LLC lists KTR coupling ranges with the technical data from the manufacturer operating and assembly instructions.
KTR product ranges
KTR couplings cover torsionally flexible jaw couplings such as ROTEX, curved-tooth gear couplings such as BoWex, steel laminae couplings, bellows couplings for servo drives, fail-safe shaft couplings and flange couplings for pump drives. KTR also makes clamping elements for keyless shaft-hub connections, along with brake systems and hydraulic components.
Because the instructions state values for rated torque, maximum torque, speed and shaft displacement, they help engineers compare coupling types and sizes before ordering, and they describe correct assembly and alignment as well.
Documents and quotation
Each KTR product page links to the manufacturer instruction with dimension tables, torque ratings and displacement data. Send the shaft sizes, torque, speed and operating conditions with your request, and Seven Star LLC will prepare a quotation from its base in Muscat, Oman.
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Frequently Asked Questions
Is a laminae coupling backlash-free?
Yes. KTR states that the laminae sets are connected to hubs and flanges by positive-locking dowel screws, so torque transmission is without backlash.
What torque range does RIGIFLEX-N cover?
From 130 Nm rated torque at size 35 to 280,000 Nm at size 408, with maximum torque equal to twice the rated value.
Why does shaft distance matter?
The permissible radial displacement grows with the DBSE. For size 35 the KTR table shows 0.90 mm at 100 mm and 1.40 mm at 140 mm.
What is the maximum speed?
It falls with size, from 23,000 rpm at size 35 to 2,500 rpm at sizes 406 and 408.
Does the rated torque include the shaft-hub connection?
No. KTR states that the torque refers to the laminae set only, and the shaft-hub connection has to be verified by the customer.
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