Page 21 - BPW axles with air suspension Series O SL AL

Struts / SL air suspension 4.5.3

Example of reinforcing a vehicle frame 1 1//11aa CCrroossssmmeemmbbeerrss
that is torsionally stiff. (Road tankers,
bulk powder tankers, vans) with normal The developed forces when travelling around curves
hanger bracket are transmitted via the hanger brackets and gusset
plates as bending forces to the crossmembers or
C-member. The bending forces from the hanger
brackets are partly counteracted by the crossmem-
ber 1a.

The gusset plates counteract torsional forces in the
vehicle frame. Both crossmembers can therefore be
designed with smaller dimensions (Wx).

2 2 GGuusssseett ppllaatteess
The lateral forces are transmitted via the gusset
ST plates as compressive / tensile loads to the cross-
member. As the lateral forces from the spring pivot
bolt are transmitted to the frame (ST), the gusset
plate needs to be continued to the bottom edge of
the hanger bracket.

Attachment at spring pivot bolt centre is desirable.
A possible diaphragm action should be prevented
by overlapping the gusset plate and inner web
plate.

3 3 VVeerrttiiccaall pprrooffiilleess

If relatively thin main beam web profiles are used, a
ST vertical profile should be incorporated to reinforce
the frame in the region of the hanger bracket.

30 60

R Reemmaarrkkss::

With vehicle frames that are torsionally stiff, the re-
inforcement of the air suspension hanger brackets
can also be rigid and torsionally stiff.

BPW-EA-Luft 1023701e 21