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Double engagement design with spacer to accommodate greater shaft distances

The TSCHAN® POSIFLEX®-coupling is a torsionally stiff gear coupling with a certain backlash. It compensates for angular, parallel and axial shaft misalignments within defined ranges. Parallel shaft offset can only be compensated by the double engagement design with two toothing planes. The coupling transmits the torque via hubs with crowned gear teeth which are in permanent mesh with the straight gear teeth of the sleeves. There must be a certain gear tooth circumferential clearance in order to compensate misalignments of the connected machines. The spacer can be radially mounted and dismounted without having to move the connected machines. The distance dimension ‘E’ between the flange hubs can then be used, for example, to service connected machines. Avoid pollution of the environment due to leaking lubricants. When the spacer is dismounted, a check of the rotational direction of the drive can easily be performed. To this purpose, hold the pushed back housing halves in place by using holding devices that can be obtained from RINGFEDER POWER TRANSMISSION as special accessories. The coupling is suitable for horizontal installation in each direction of rotation. For applications involving other than horizontal position, it may be necessary to support the housing or the spacer. Please contact RINGFEDER POWER TRANSMISSION, if this has not been taken into account when selecting the coupling size. It is imperative to use a lubricant that is appropriate for the specific requirements of the gear coupling in order to ensure reliable and continuous operation.


CAD Size D1 D2 D3 Emin L L3 L4 L5 l1 m
    mm mm mm mm mm mm mm mm mm kg
  106 171 106 129.5 121 245 58.5 47.5 90 62 Abh?ngig von E Depending on E
  130 210 130 156 139 291 68.5 56 110 76 Abh?ngig von E Depending on E
  151 234 151 181 143 323 82 65.5 110 90 Abh?ngig von E Depending on E
  178 274 178 209 170 380 98 77 130 105 Abh?ngig von E Depending on E
  213 312 213 247 172 412 108.5 87.5 130 120 Abh?ngig von E Depending on E
  135 337 235 273 180 450 121 99 130 135 Abh?ngig von E Depending on E
  163 380 263 307 216 516 132 110 160 150 Abh?ngig von E Depending on E
  186 405 286 338 230 580 151.5 129.5 160 175 Abh?ngig von E Depending on E
  316 444 316 368 244 624 165 143 160 190 Abh?ngig von E Depending on E
  372 506 372 426 236 676 183.5 160.5 160 220 Abh?ngig von E Depending on E
  394 591 394 472 226 780 225 92.5 176 280 Abh?ngig von E Depending on E
  432 640 432 518 243 827 234 102.5 190 292 Abh?ngig von E Depending on E

General features

  • Torsionally rigid gear coupling made of high-quality steel
  • Compensates for angular,radial and axial shaft offset
  • Suitable for use in temperatures up to +130°C if special seals are used
  • Available with split sleeve (ZEA / ZEB - ZEA model range also available in ZEB design) and single-piece sleeve (ZEH)
  • The elastic ring can be replaced without having to move the coupled machines (multi-part models)
  • Bores up to 320 mm
  • Torques up to TKn = 290,000 Nm / TKmax = 580,000 Nm
  • Speeds up to nmax = 5,000 rpm

General description

The POSIFLEX® coupling is a torsionally rigid twin cardanic gear coupling.


The coupling housings have a straight internal toothing whilst the hubs have an external toothing with a chased variable radius. As a result, the hubs can move spatially within the housing and thus compensate angular, radial and axial shaft misalignment of the adjoined shaft ends within specified tolerances. Depending on coupling type and size, the standard toothing permits an angular misalignment of up to 0.75 degrees per toothing-plane and an axial movement of several millimetres. The max. possible radial shaft displacement is dependent on the distance between the two toothing planes. Other toothing geometries can be used for further specific applications.


High-grade tooth profiles and grease with ultra high-pressure additives guarantee low-restoring forces and a long serviceable life. The material used is forged steel with an apparent yielding point of at least 350 N/mm2. Special materials can be used for further specific applications. Sealing is carried out using O-rings and lip-seals of buna N. The housings are centred and held together by fit-bolts and self-locking nuts.


The use of special seals permits the temperature limit to be raised to 130 °C.


At peripheral speeds upwards of 30 m/s it is advisable to dynamically balance the coupling.

Special applications

If greater misalignements are anticipated at higher speeds and torques, an examination is necessary, performed with the assistance of a special computing programme. This is independent of the determined size. The value TKmax may not be exceeded in any state of operation (start-up, electrical short circuit, blocking, etc.).

Tolerances and standards

The bore tolerance is ISO H7, if not differently ordered. The bore diameters listed refer to keyways to DIN 6885/1.

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