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Brand: KTR
KTR REVOLEX KX Flexible Pin and Bush Coupling
Description
Pin and bush coupling for high torque and shock-loaded drives
The KTR REVOLEX KX and KX-D is a torsionally flexible pin and bush coupling for large drives. KTR positions it for applications with high torques and shock loads: it is robust, fail-safe, compensates every kind of shaft displacement and can be plugged together axially. Steel pins carrying elastomer bushes drive between two flanged hubs, so there is no metal-to-metal contact and the bushes damp torque peaks.
The values below are from KTR operating and assembly instructions KTR-N 49410 EN (edition 16), covering type KX with taper bolts and type KX-D with taper pins, both in design B.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer | KTR Systems GmbH, Rheine, Germany |
| Coupling type | Torsionally flexible pin and bush coupling, axially pluggable |
| Types | KX (taper bolt design B) and KX-D (taper pin design B) |
| Sizes, type KX | 75 to 265 |
| Sizes, type KX-D | 75 to 650 |
| Rated torque TKN, type KX | 3,440 Nm (size 75) to 100,500 Nm (size 265) |
| Rated torque TKN, type KX-D | 4,300 Nm (size 75) to 1,350,000 Nm (size 650) |
| Maximum torque TK max. | Twice the rated torque |
| Elastomer bush | NBR (Perbunan) 80 plus or minus 5 Shore A, standard material |
| Hub material | Cast iron from size 105 (smaller sizes 75 to 95 in steel only); steel for all sizes |
| Maximum speed, type KX-D, cast iron / steel | 2,000 / 3,475 rpm (size 105); 900 / 1,550 rpm (size 240) |
| Maximum finish bore, type KX-D, steel | 100 mm (size 75), 190 mm (size 150), 310 mm (size 240), 700 mm (size 650) |
| Axial displacement Ka | Plus or minus 1.5 mm (sizes 75 to 95) to plus or minus 4 mm (sizes 330 and above) |
| Radial displacement at 1500 rpm | 0.40 mm (size 75) to 0.8 mm (size 215) |
| Temperature classes for explosive atmospheres | T5: -30 °C to +75 °C; T6: -30 °C to +60 °C |
| Balancing | Dynamic balancing required for the speeds listed |
Choosing between KX and KX-D
Type KX uses taper bolts and covers sizes 75 to 265 in a compact envelope. Type KX-D uses taper pins, extends the range to size 650, and reaches the highest rated torques in the family: more than 1,000,000 Nm at the largest size. Both types carry the torque on elastomer bushes, so the rated values apply to the bushes only. KTR points out that the transmittable torque of the shaft-hub connection must be checked separately by the user.
Some sizes need a drop-out centre dimension to remove the bushes and pins, which is flagged by an asterisk in the KTR tables. Check this against the space between the machines before ordering. Large and fast-running sizes require dynamic balancing; the maximum speeds in the tables assume balanced couplings.
Installation and use in explosive atmospheres
KTR lists the pin sizes with their tightening torques, from 67 Nm for the smallest pins to 970 Nm for pin size 6, and a separate table of setscrew torques for the hubs. Bores must stay inside the maximum finish bore, because oversized bores can tear the hub. For explosive atmospheres the instruction defines temperature classes T5 and T6 with the ambient limits above. Alignment must keep radial and angular displacement within the speed-dependent table, with only half the values allowed in explosion group IIC.
Documents and quotation
The attached PDF is the KTR operating and assembly instruction for REVOLEX KX and KX-D. For a quotation send the rated power and speed, shaft diameters with key sizes, the prime mover (motor, diesel engine or turbine), start frequency, ambient temperature and available space between the shaft ends. See Electric Motors and Gear Units for related drive equipment.
Datasheets & Documents
- Operating Instructions KTR REVOLEX KX / KX-D operating and assembly instructions KTR-N 49410 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.
Related products
Frequently Asked Questions
What is the difference between KX and KX-D?
KX uses taper bolts (sizes 75 to 265); KX-D uses taper pins and extends to size 650 with much higher rated torque.
What are the bush materials?
Standard material is NBR (Perbunan) with 80 plus or minus 5 Shore A, according to KTR-N 49410.
Does it need balancing?
Yes. KTR notes that dynamic balancing is required for the maximum speeds listed in the tables.
What displacement can it absorb?
Axial plus or minus 1.5 mm on sizes 75 to 95 up to plus or minus 4 mm on the largest sizes. Radial and angular values reduce as speed rises.
Which temperature classes does KTR state?
T5 for ambient temperatures from -30 °C to +75 °C and T6 from -30 °C to +60 °C, with surface temperatures of 95 °C and 80 °C.
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