Pommier A5442 Notice Originale page 26

5.4 Underrun bar tilt – 10° maximum
The underrun bar system can be installed at a tilt angle of up to 10° with respect to the horizontal plane.
The three ways of securing the underrun bar to the chassis in the case of a horizontal mounting surface are also
authorised for a tilted mounting surface.
If an alternative drilling configuration is desired, the following parameters should be taken as reference:
Gross Combination Weight Rating
Thrust force
Height of screws - bumper
Moment (or lever arm)
Drilling diagram width
Drilling diagram height
Number of screws
Screw diameter
Mounting surface area
Thread root cross-section
Maximum shear force**
* Force P2 is limited to 180 kN maximum
** The ISO 20898 T1 standard provides the minimum tensile strength for a 10.9 class screw: Rm = 1000 N/mm². The maximum shear stress is commonly
calculated as 70% of Rm, i.e. 700 N/mm².
Trimming
permitted
10° max
Parameters recommended by POMMIER (Specimen)
GCWR
P2 reference
L
M2 reference
A
Z
N
M
S
Sff
F
Table 10
-
GCWR (in kg) x 0.85 x 9.81
-
P2 x L
-
-
-
-
A x Z
-
Sff x 700 x N / 1000
21,600 kg
180 kN*
471 mm
84780 kN.mm
150mm
100mm
10
14
15,000 mm²
110 mm²
770 kN
26/112