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TSCHAN® POSIFLEX® - ZEA-BT

Double engagement design with brake drum

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 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. Avoid pollution by leaking lubricant.

ZEA-BT ZEB-BT

CAD Size Db x B D1 D2 D3 E L L4 L8 l1 m J
    mm mm mm mm mm mm mm mm mm kg kgm2
  106 250 x 95 171 106 129.5 16 140 47.5 7 62 24.3 0.16
  106 315 x 118 171 106 129.5 18 142 47.5 ?6,0 62 33.6 0.397
  106 400 x 150 171 106 129.5 20 144 47.5 ?26,5 62 52 1.171
  130 315 x 118 210 130 156 20 172 56 13 76 45.3 0.479
  130 400 x 150 210 130 156 22 174 56 ?11,5 76 62.8 1.233
  151 315 x 118 234 151 181 20 200 65.5 27 90 57.2 0.56
  151 400 x 150 234 151 181 22 202 65.5 25 90 74.5 1.313
  178 400 x 150 274 178 209 23 233 77 18 105 93.8 1.543
  178 500 x 190 274 178 209 24 234 77 ?13,5 105 123.3 3.625
  213 400 x 150 312 213 247 23 263 87.5 33 120 122.3 1.934
  213 500 x 190 312 213 247 24 264 87.5 1.5 120 151.8 4.017
  213 630 x 236 312 213 247 29 269 87.5 ?18,5 120 209.7 10.215
  235 500 x 190 337 235 273 26 296 99 17.5 135 178.7 4.477
  235 630 x 236 337 235 273 31 301 99 ?2,5 135 236.3 10.67
  235 710 x 265 337 235 273 38 308 99 ?12,0 135 293.3 18.468
  263 500 x 190 380 263 307 26 326 110 32.5 150 226.2 5.566
  263 630 x 236 380 263 307 31 331 110 12.5 150 283.3 11.749
  263 710 x 265 380 263 307 38 338 110 3 150 339.7 19.536

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.

Toothing

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.

Materials

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.

Temperature

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

Balance

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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