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TSCHAN® POSIFLEX® - ZEHU 3-10

Double engagement design
Installation dimension can be varied by shortening the universal hub
Sizes: 3 - 10

ZEHU

CAD Size D1 D2 E L L1 L4 l1 l2 m J
    mm mm mm mm mm mm mm mm kg kgm2
  3 84 50.9 6 136.7 50 31 33.5 95.2 2.8 0.002
  4 95 60.4 8 150 65 37 41 101 4.5 0.004
  5 120 82.6 8 174 68 35 48.5 117.5 8.5 0.012
  6 140 100 12 193 80 46 51 130 13.3 0.028
  8 168 121 12 219 95 57.5 61 146 21.4 0.065
  10 190 143 12 279 102 61 102 165 35.7 0.14
  151 186 151 5 260 174 133.5 90 165 45 0.189
  178 216 178 6 281 206 157 105 170 63 0.39
  213 254 213 6 316 227 178.5 120 190 99 0.845
  235 282 235 8 343 254 202 135 200 130 1.4
  263 317 263 8 378 276 224 150 220 180 2.45
  286 346 286 8 433 319 263.5 175 250 240 3.88
  316 376 316 8 478 346 290 190 280 310 6.02
  372 436 372 10 580 383 326.5 220 350 491 12.82

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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