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Versability and Flexibility

The GeN2 Mod concept combines innovative technologies and materials. The flat belt with its revolutionary traction technology - the core of the system - represents a decisive breakthrough. This innovation, linked to the new technologies of the gearless machine and compact sheaves, make the GeN2 Mod a highly efficient system.
  • An innovative technology
    The GeN2 Mod concept marks the arrival of a new technology in lift engineering: the use of high-strength flat belts.
    These belts consist of:
    • steel cords that are stronger than traditional cables,
    • a polyurethane sheath with exceptional properties that encloses the steel cords.
    This technology was developed in 1997 and launched in 2000. Since then, 50 000 new lifts worldwide have been equipped with the system.
  • Reliability and durability
    Reinforcement with steel cords invests the belts with great dynamic stability and enables a constant tension to be maintained over their entire length. The polyurethane sheath is robust and abrasion-resistant besides being flexible and resistant to greases, oils and solvents.
    Compared with traditional steel cables, the belts have a larger contact surface that reduces the wear of the belts and sheaves. Their lifetime is also increased through the contact of the smooth surface of the belts with the crown-surfaced sheaves. The service life of flat belts is thus 2 to 3 times greater than that of conventional cables.
    The belts have undergone exactly the same stressing and bending tests as traditional cables: 20 years of operation and 300 000 lift flights per year were simulated with the belts under full-load cycles. All these reliability tests were performed under the supervission of the TUV, and independent international certificaction organisation.
  • Passenger safety
    The belts have undergone operating tests at temperatures ranging from -20ºC to +60ºC.
    They have also been exposed to hazardous materials.
    The fire tests demonstrated that the polyurethane resists temperatures up to 200ºC. Beyond this, the steel cords continue to maintain adherence.
    The lift operates until the car reaches a safe position at a floor level. The tensive strength of the belts is identical to that traditional cables: 32KN or 64KN depending on the flat belt model.
    The steel cords are fabricated in electrogalvanized steel to prevent corrosion

  • Unsurpassed ride quality
    The polyurethane coating of the flat belts eliminates the metal friction of traditional cables so ensuring a quieter ride. The flat contact surface of the belts reduces vibrations. The pulleys have also been specially adapted so that they minimise vibrations transmitted to the lift car to ensure a more comfortable ride.
  • Power unit efficiency
    The flat belts ensure uniform and precise transfer of the power from the motor to the car as they adhere better than conventional cables while weighing 20% less. Their flexibility allows for a very small bending radius so the sheaves can be as small as 10cm in diameter. The machine can be up to 70% more compact than a machine with conventional gearing. The power unit is no less effective since the GeN2 Mod technology uses a 2/1 roping system: the car and counterweight suspension uses belts that allow the installation of lower power, smaller and therefore more efficient machines.
  • Environmental friendliness
    The compact pulleys (machine, bedplate, car and counterweight) are equipped with sealed-for-life bearings which, like the polyurethane flat belts, require neither oil nor grease. The GeN2 Mod technology constitutes an important advance in Otis's effort to develop "green" products.
  • Speed of installation
    To adapt the old traction equipment located in the machine room placed above the hoistway, a flexible and modular bedplate is installed on the slab.This makes it extremely easy to adjust the belt with car and counterweight traction points in exactly the same position. The installation method, using a laser guiding process, ensures absolute precision and ease of positioning of all the elements.
    The coupling of the pulleys to the car and counterweight is achieved using a modular adaptor assembly that can be fitted onto virtually all existing configurations.
    The cable ducts are reused, and enlarged if necessary. The design of the bedplate ensures perfectly uniform and complete ditribution of the bearing points.
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