With the assistance of a three dimensional mathematical model of a radial tyre it has been possible to calculate the forces in the tyre's cross-section and the normal pressure distribution in the contact area for slowly moving, loaded wheels. Even apparently insignificant changes in the form of the cross section of the cords lead to considerable changes in the distribution of forces in the tyre. This effect can be correspondingly quantitatively reduced in actual tyres by the ductility of the cord threads. By the choice of a constant curvature for the girth the number of possible cross-sectional forms may be restricted. In contrast a variable curvature offers a greater number of possible variations and thereby presents a favourable basis for the optimisation of the cross-sectional form. The normal pressure distribution of the contact area is decisively influenced by the behaviour of the curvature of the belt and the bearing surfaces limiting curve, by the bending stiffness and by the difference of the angle at the junction of the side wall and belt. By specific combinations of the bearing surface curve and the belt's curvature a uniform ground pressure distribution over the breadth of the contact area may be achieved. Apart from the ground pressures in the area of the edge zones of the contact area, the ground pressure in the middle area is relatively similar. The greatest possible constancy in the ground pressure over the whole contact area should be aimed at. Finally it should be noted that up to now it has not been possible to satisfactorily calculate horizontal forces (e.g. the resistance to momement). /TRRL/

  • Corporate Authors:

    Franckhlsche Verlagshandlung

    Pfizerstrasse 5, Postfach 640
    7000 Stuttgart 1,   Germany 
  • Authors:
    • Gauss, F
  • Publication Date: 1977-6


  • German

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00189385
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Mar 28 1979 12:00AM