INVESTIGATION OF MOTORCYCLES WITH A PASSIVE STEERED REAR WHEEL

The critical weave mode oscillations of motorbikes, which occur in the high velocity domain, can be damped by a steerable rear wheel when this is turned around a suitable steering axis. Via the case of the one-wheel-drag model, it is shown how this rear wheel steering axle has to be designed, in order to generate a steer angle by tire side force. This steer angle in turn increases the side force and therefore the weave mode damping ratio. Within the limits of usual dimensions of a motorbike, the construction of such a steering axle is only possible by using an adequate quadrilateral joint. The rear wheel steering mechanism was investigated with the help of a simulation model, based on the multi-body-formalism. A simulation of the driving behaviour showed the influence of the rear wheel steering angle upon the driving behaviour of a test motorbike. Final driving tests with a test motorbike equipped with the rear wheel steering system confirmed the usefulness of the chosen approach although there is a shortcoming in the design. The tests were carried out on a roller-test-stand and on a testing field. (A) For the covering abstract see IRRD 880121.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 23-9

Subject/Index Terms

Filing Info

  • Accession Number: 00724148
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 7-80003-311-2
  • Files: ITRD
  • Created Date: Aug 19 1996 12:00AM