Seitenkraft Basis: Achslast der gelenkten bzw starrdeichselanhänger-Achse(n), A v Lenkrollradius r (bei Achsschenkellenkung) bzw Spurweite, 2 r wirksame Deichsellänge L Prüfkraft: a) Statische Prüfung: F q stat = g *0,60*A v *r/L b) Nachrechnung dynamisch: F q sch = g*0,30*A v *r/L c) Dauerschwingversuch:F qw = g*0,18*A v *r/L (Bei Anhängern, die keine Achsschenkellenkung haben, ist r = 1 Meter anzunehmen). Lateral forces on drawbars according to the German Regulation TA31
Lateral side force Base: Axle load on the steered axle or rigid drawbar trailer axle(s), A v Steering roll radius r (by steered axle) or track, 2 r Effective drawbar length, L Test force: a) Static test: F q stat = g *0,60*A v *r/L b) Dynamic calculation: F q sch = g*0,30*A v *r/L c) Fatigue test:F qw = g*0,18*A v *r/L (If a trailer, do not have a steered axle, r = 1 Meter shall be assumed). Lateral forces on drawbars according to the German Regulation TA31
Assessment using static lateral side force Single axle case: Super Single tires (width ~450 mm) and single axle => r= 1 m F q stat *L = g *0,60*A v *1 = g *0,60*A v Single axle case: Super Single tires and double axle with separation 1,3 m=> r= 1,2 m F q stat *L = g *0,60*A v *1,2 = g *0,72*A v Comments: TA31 is concerned with rolling radius which is relevant for single axles. A double axle involves a fair amount of scuffing when turning. I.e. For that reason an adjustment from 0,6 to 0,79 [0,95/1,2] seems justified. Conclusion: TA31 support the current requirements in Regulation 55. Lateral forces on drawbars according to the German Regulation TA31