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7 August 2016

 

Advantages of steel wheels SkyWay

Comparison of conventional railway wheel and innovative unibus wheel.

Conventional railway wheel

Fig. 1. Conventional railway wheel

Increased wheel wear and noise due to the following:

  • big contact stresses (1,000 MPa and more), caused by a small size of contact patch;
  • slipping in the contact patch, caused by a difference of seating diameters in the conical surface of the wheel;
  • operation of brake mechanisms (brake shoes cause additional wheel thread wear);
  • big static and dynamic wheel loads combined with inevitable track irregularities;
  • a rigid wheel pair prone to self oscillations, which increase wear and noise;
  • symmetrical load application onto the rail head.

Innovative unibus wheel

Fig. 2. Innovative unibus wheel

Calculation of contact stress for high-speed Unibus with gross weight of 5 tons:

Calculation of contact stress for high-speed Unibus with gross weight of 5 tons

Thus, advantages of SkyWay transport wheels:

  • insignificant contact stress (less than 200 MPa) due to a wide contact patch (by rail head width);
  • no slipping in the contact patch (cylinder rolling along the plane);
  • disk brake mechanisms and ABS, which prevents wheels locking;
  • small wheel load and absence of joints on the track;
  • symmetrical rail head wear (vertically and horizontally);
  • minor wheel rolling resistance due to a narrow contact patch (in direction of wheel rolling).

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