Iveco EUROCARGO, Instructions Manual

Page: 97 / 226

EUROCARGO Euro 6
–
APPLICATIONS OF SUPERSTRUCTURES
APPLICATIONS OF SUPERSTRUCTURES
3.2 ELEMENTS MAKING UP THE COUNTER CHASSIS
7
–
Printed 603.95.747
–
1st Ed. - Base 12/2013
Please note that in defining the minimum size of the reinforcement profiles in addition to the limit of the allowable stress for
aluminium, reference must be made to the different Elastic Modulus with respect to steel (approx. 7,000 kg/mm
2
against 21,000
kg/mm
2
for steel) which involves greater dimensioning of the profiles.
Similarly, when the connection between the chassis and counter chassis is such as to ensure the transmission of the shear stresses
(connection with plates), in checking the stresses at the two ends of the individual section, it is necessary to define the new neutral
axis for this, on the basis of the different elastic modulus of two materials.
The collaboration requirement for aluminium means, in short, large and not very convenient dimensions.
3.2 ELEMENTS MAKING UP THE COUNTER CHASSIS
Longitudinal profiles
The side members of the added structure must be continuous, extended as much as possible toward the front of the vehicle and
towards the rear area of the front spring support; in addition, they must rest on the chassis and not on the brackets.
In order to achieve a gradual reduction of the resistant section, the front ends of the profile must be tapered in height with an
angle not exceeding 30
°
, or another form of equivalent tapering (see Figure 3.1); the front end in contact with the chassis must
be properly coupled, with min. radius of 5 mm.
91136
Figure 1
In cases in which the components of the cab rear suspension do not allow the passage of the profile in the entire section, this can
be realised as in Figure 3.2. If, due to construction, there are high bending moments on the front of the chassis (e.g. in the case of
a crane with the working range on the front of the vehicle), the profile of the counter chassis must be dimensioned to cope with
such forces.
91137
Figure 2