Iveco DAILY M.Y. 2012, Body Builder Instructions

Page: 112 / 252

3-14
FITTING SUPERSCTRUCTURES D
AILY
Base - 02/2012 Printed 603.95.241
Connections between frame and counterframe
3.3.6 Connection with plates for longitudinal and transverse fixing (rigid joint)
The type of fastening shown in Figure 3.11, with plates welded or bolted to the sub-frame and fastened with screws or nails to
the vehicle chassis, ensures good reaction to longitudinal and transversal forces and greater support to the overall rigidity.
Figure 3.11
102462
In order to use these plates correctly, take the following into account:
- the fastening of the vertical rib of the side members of the chassis must be performed only after checking that the sub-frame
adheres exactly to the chassis;
- distribution must be limited to the central and rear area of the chassis;
- the quantity and thickness of the plates and the quantity of fastening screws must be suitable to transfer the flexing and shearing
moments of the section.
Rigid joints are useful when the structure generates high flexing and torqueing moments on the chassis and the capacity of the chassis
to resist shearing must be improved, or when the height of the sub-frame needs to be limited as much as possible (e.g. towing central
axle trailers, crane on the rear overhang, tail lifts, etc.). If this occurs, the indications of the following table must be observed:
Table 3.3
Chassis / subframe
section height ratio
Max. distance
between the centre
line of the
shear-resistant plate
(mm)
1)
Models
3)
Min. plate characteristics
Thickness
(mm)
Screw size
(min. 3 screws per plate)
2)
>
1.0 700 35C, 40C 4 M12 (min. 2 screws per plate)
≤
1.0 500 45C, 50C 4 M12 (3 screws per plate)
≤
1.0 500 60C, 65C, 70C 5 M12 (3 screws per plate)
1) Increasing the number of bolts per plate enables a proportional increase in the distance between the plates (twice the number of bolts enables a greater distance
between the plates). In the areas of high stress (e.g., supports of the rear spring, or of the rear air springs) provision must be made to fit the plates as close
together as possible.
2) In the case of limited thickness of both the plates and the subframe, the connection should be carried out using spacers, so that longer bolts can be used.
3) For 29L and 35S models, installation of shear resistant plates will need to be assessed for each case.