CHASSIS MODIFICATIONS 2-67 E UROCARGO Euro 4/5 Alterations to the rear protection bar The choice of the retarder must be made according to the following formula: R’ ⋅ PTT ≅ 1 i p ⋅ C f i p = rear-axle ratio C f = maximum braking torque (Nm) R’ = radius under load of the tyre used (m) PTT = ground vehicle weight (kg) Computational example of the maximum braking torque of the retarder for New EuroCargo Let’s consider a New EuroCargo ML120E18R/P vehicle with axle ratio 4.88 and tyres 265/70R19.5. From the data 1. i p = 4.88 2. R’ = 0.401 m 3. PTT = 12000 kg We obtain: C f = (12000 · 0.401) / 4.88 = 9.86 Nm A retarder brake can be applied with peak torque of deceleration of 1000 Nm.
2.20 Alterations to the rear protection bar The maximum distance allowed from the device to the most rearward part of the body is 400 mm, less the deformation found in the phase of type-approval (less than 20 mm). The vehicles are equipped with a rear underrun bar in compliance with the current EU Directives. When the changes on the chassis frame require adjusting the rear overhang, the rear underrun bar will have to be repositioned (in observance of current regulations), making the same connection to the chassis frame as on the original version. When converting vehicles or applying special equipment (e.g. tail lifts), it may be necessary to operate on the structure of the under- run bar.
This operation must not jeopardize the original characteristics of resistance and rigidity (respect national regulations). If requested, the bodybuilder must present the necessary documentation for compliance with the required characteristics. If it is necessary to mount another rear underrun bar it is necessary to check compliance with the current regulations. The documentation or the test certificates must be presented, if required, to the competent Authorities. Alterations to the rear protection bar Print 603.93.431 Base - January 2008