BK2

Bellows couplings

The BK2 bellows coupling from R+W Couplings has a very economically interesting design and is easy to assemble due to the clamping hubs. The BK2 coupling has a low mass moment of inertia and by using friction clamp connection, the precision coupling is absolutely free of backlash. Thanks to its forced bellows shape, the element can simultaneously accommodate lateral, axial and angular misalignments. As long as they do not fall outside the maximum area, no metal fatigue will occur in the bellows material and the clutch is completely free of wear. For specific questions about bellows couplings, contact VARIODRIVE.

Implementation
Clamp hub
Nom. Torque
15-10.000 Nm
Speed
up to 10,000 rpm
Temperature range
-30 to +100 oC
Bellows material
STAINLESS STEEL
Hub material
Steel or Alu
Peak load
Up to 1.5x nom. Torque
Backlash
None
Service-life
No service
Optional
ATEX, clean room version

Datasheets
  • Bestelcode instructies
  • ATEX instructies
  • Datasheet BK2
Manuals
  • Manual BK/MK koppelingen
BK2 drawing
Tabel
BK2 Series15 30608015020030050080015004000600010000
Rated torque (Nm)TKN1530608015020030050080015004000600010000
Overall length (mm)A-259 | 66 | 9969 | 77 | 11383 | 93 | 13094 | 106 | 14395 | 107 | 144105 | 117 | 163111 | 125 | 200133 | 146 | 169140 | 179166 | 230225252288
Fit length (mm)c2227313636414351455585107129
Inside diameter possible from ØtoØ H7 (mm)DI/D28-2810-3012-3514-4219-4222-4524-6035-6040-7550-8050-9060-14070-180
Outside diameter (mm)B495566818190110124134157200253303
Moment of inertia (10-kgm2)Jges.0,06 | 0,07 | 0,080,12 | 0,13 | 0,140,32 | 0,35 | 0,40,8 | 0,85 | 0,91,9 | 2 | 2,13,2 | 3,4 | 3,67,6 | 7,9 | 8,314,3 | 14,6 | 14,816,2 | 1743 | 451654951214
Approximate weight (kg)0,160,260,480,81,852,6546,35,711,528,849,480,9
Torsional stiffness (103 Nm/rad)CT20 | 15 | 1439 | 28 | 2776 | 55 | 54129 | 85 | 84175 | 110 | 97191 | 140 | 135450 | 350 | 340510 | 500 | 400780 | 7111304 | 11803400570010950
Axial ± (mm))max.1 | 2 | 31 | 2 | 31,5 | 2 | 32 | 3 | 42 | 3 | 42 | 3 | 42,5 | 3,5 | 4,52,5 | 3,5 | 4,53,5 | 4,53,5 | 4,53,533
Lateral ± (mm)max.0,15 | 0,2 | 1 | 0,2 | 0,25 | 10,2 | 0,25 | 10,2 | 0,25 | 10,2 | 0,25 | 10,25 | 0,3 | 10,25 | 0,3 | 10,3 | 0,35 | 10,35 | 10,35 | 10,40,40,4
Angular ± (degree)max.1 | 1,5 | 21 | 1,5 | 21 | 1,5 | 21 | 1,5 | 21 | 1,5 | 21 | 1,5 | 21 | 1,5 | 21 | 1,5 | 21,5 | 21,5 | 21,51,51,5
Axial spring stiffness (N/mm)ca25 | 15 | 8450 | 30 | 11872 | 48 | 16548 | 32 | 14482 | 52 | 13090 | 60 | 280105 | 71 | 60570 | 48 | 85100 | 285320 | 4405651030985
Lateral spring stiffness (N/mm)cr475 | 137 | 140900 | 270 | 2241200 | 420 | 337920 | 290 | 4011550 | 435 | 5002040 | 610 | 7503750 | 1050 | 12002500 | 840 | 6142000 | 14903600 | 170060701920021800
Fastening screw (ISO 4762)EM15M6M8MIOMIOM12M12M162x M16*2x M20*2x 1424*2x 1424*2x M130*
Tightening torque of the fastening screw (Nm)E815405070120130200250470120012002400
Distance between centerlines (mm)F17192327273139412x482x552x652x902x117
Distance (mm)G6,57,59,5111112,51316,51822,5283542
Hub materialAluminium optional SteelAluminium optional SteelAluminium optional SteelAluminium optional SteelSteel optional AluminiumSteel optional AluminiumSteel optional AluminiumSteel optional AluminiumSteelSteelSteelSteelSteel
1530608015020030050080015004000600010000
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Frequently Asked Questions

You can place an order with VARIODRIVE by sending your request to orders@variodrive.nl. Your request will then be processed directly by our internal sales team.

By choosing VARIODRIVE’s complete solution, you won’t need to worry about integrating different drive components into the machine’s drive chain. We stand behind our complete solution and can guarantee its functionality.

Due to our in-depth knowledge of our products and their integration into applications, we can provide a system warranty. At that point, we guarantee that the application will function using our motion control and traction solutions.

For most products on our website, you can download the 3D files. If the desired 3D file is not available, please contact sales@variodrive.nl, and we will send you the 3D file as soon as possible.

You can download the necessary configuration software for most products on our website. For a few products, this might not be possible. In such cases, please contact sales@variodrive.nl, and we will assist you as soon as possible.

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