3-6 BUILDING & MOUNTING THE STRUCTURES E UROCARGO Euro 4/5 Elements making up the subframe 3.2 Elements making up the subframe 3.2.1 Longitudinal runner profiles The longitudinals of the added structure must be continuous, extending as far as possible forward to the front of the vehicle to include, if possible, the area of the rear support of the front spring, and rest on the chassis of the vehicle but not on the brackets.
In order to achieve a gradual reduction in the resistant section, the front ends of the longitudinal runner must be tapered upwards at an angle of no more than 30 ° , or tapered in some other equivalent way (see Figure 3.1), ensuring that the front end in contact with the chassis is suitably connected, min radius 5 mm. Figure 3.1 91136 If the cab’s rear suspension components do not allow the entire runner to pass through, the latter may be shaped as shown in Figu- re 3.2. This could require the assessment of the minimum resisting section if high flexural moment occurs at the front (e.g. with crane mounted behind cab if operating towards of the vehicle front).
Figure 3.2 91137 The construction of auxiliary frames either wider or narrower than the chassis structure is permitted only in particular cases (e.g. re- movable containers sliding on rollers operated by mechanical or hydraulic systems). In these cases a necessary precaution will be that of ensuring a correct transmission of the forces between the auxiliary frame and the side member vertical web. This can be obtained by inserting an intermediate runner profile shaped according to the vehicle’s side member or by applying a stiffened con- necting L-section. Elements making up the subframe Base - January 2008 Print 603.93.431