Motorbike Suspensions: Modern design and optimisation by Dario Croccolo

By Dario Croccolo

Although they might appear like uncomplicated parts, the motorcycle fork performs a severe function within the total dynamic behaviour of bikes. It needs to offer applicable stiffness features, damping functions and the bottom sliding friction values so as to warrantly as a lot functionality, security and luxury as attainable to the rider. Front motorcycle Suspensions addresses the elemental facets of the structural layout of a bike fork.

Utilizing the authors' decades of expertise during this commercial examine subject, motorcycle Suspensions presents valuable layout ideas and utilized mechanical layout theories to optimize the form of bike suspension. total structural concerns are explored along particular points together with how bolted and adhesively bonded joints layout might be utilized to those components.

R&D designers within the motorbike who want to enhance their wisdom concerning the structural layout of bike suspension will locate motorcycle Suspension a concise and coherent advisor to this particular characteristic. while, undergraduates and graduates in commercial engineering issues may well use this as a case examine for an attractive program of the theories realized from desktop layout courses.

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22. A final comment deserves to be mentioned. All the trends of stresses show different behaviors if the motorbike is driven at low or at high speed. In the case of low values of speed the maximum power transmittable is limited by the capsizing limit so that, in this case, the mass load is, essentially and wholly, applied to the rear wheel and axle, thus, to the rear suspension. When the speed increases it is possible to transfer the total traction power to the rear wheel and, at the same time, to transfer some of the weight forcesto the front wheel.

Such a model takes into account some architectural configurations as well as some characteristic geometrical parameters of the fork and of the motorbike. The model was validated referring to some production forks, both by finite element analyses and by experimental tests on the road. In the case of forks equipped with a single brake disc, the load unevenness between the legs during braking is analysed, and some strategies aimed at reducing such loading unbalance are suggested. The model presented herein could be helpful for designers who are developing new fork models, because it allows foreseeing critical issues due to legs dimensioning since the early phase of product development, when FEA techniques may be difficult to implement.

36. 36) −Fchain × cos (θ − η) × d3 + R21 × d2 + −R11 × d1 + Fb − Ft + f p × F p p × C K r ear = 0 The solutions of the system of Eq. 36 are indicated in the following equations. 3 Braking and Traction Forces 27 Fig. 8 Scheme of the bearings reactions of the rear suspension generated by the braking loads Fig. 37) Fchain × cos (θ − η) × (d3 − d1 ) − Ft − Fb − f p × F p p × (d1 − C K r ear ) d2 − d1 Fc p × [rcr ear cos α − (d1 − C K r ear ) sin α] + Fchain × sin (θ − η) × (d3 − d1 ) = + d2 − d1 F p p × [rcr ear sin α + (d1 − C K r ear ) cos α] − d2 − d1 R21 = R22 As described above is useful to align the loads to the normal n and to the parallel p directions with the respect to the rear suspension axis (AB of Fig.

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