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A NEW TYPE OF TYRE STUD, ROAD PAVEMENT WEAR AND BRAKING PERFORMANCE

PROVNING AV EN NY TYP DACKDUBB FOR PERSON BILAR, VAGSLITAGE OCH BROMSVERKAN

The new stud--in the following called the LK-stud--consists of a hardened steel sleeve enclosing a carbide core and a small, soft rubber cushion. The carbide core is axially movable in the sleeve and is suspended by the rubber cushion. The forces exerted on the road surface by the new stud will be much lower than those by conventional studs because of this extra spring action from the rubber cushion. This decrease in forces is supposed to bring about a considerable decrease in pavement wear. Two sets of studded winter tyres were prepared, one set with KL-studs and another set with conventional, single flanged studs. The same type of winter tyre was used and each tyre was equipped with 108 studs. Pavement wear caused by the KL-stud was found to be only 40 percent of wear by conventional studs. Friction Test was used to compare braking performance of the two types of studded tyres. When comparing new tyres, within the speed range 50-70 km/h, the KL-studded tyres were found to be equivalent to tyres with conventional studs. When used for 8,000 km on a passenger car the KL-studded tyres were inferior to the tyres with conventional studs and in some cases not better than unstudded winter tyres concerning braking performance. However it might be possible to rectify this inferiority by improved installment of the KL-stud. /Author/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 40 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00172889
  • Record Type: Publication
  • Report/Paper Numbers: VTI Rpt. 142
  • Files: TRIS
  • Created Date: Apr 12 1978 12:00AM