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INTRODUCTION
PRELIMINAR STUDIES AND CONSIDERATIONS
MOUNTING AND CONSTRUCTION
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Fig. 5-105 SPBGC52_004 Minimum radius for rounded edges r
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Fig. 5-106 SPBGC52_005 Progressive transition u-beam to box beam
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V1.0, February 2015
POWER TAKE-OFF
Prevent sudden changes in stiffness between the chassis frame and the sub-
frame. In the front, before the first point of attachment, the subframe should
be beveled by mitering or by dovetailing. The front peak should also be
rounded, with a radius of at least 5 mm.
If the subframe is closed at various points, forming a box, the transition from
box beam to U beam should be progressive. This is done when the beam section
which is obtained by calculation is too high or when there are specific high
point loads that can deform the longitudinal beams. On the one hand, a bigger
resistant moment is achieved, and on the other hand, the subframe structure
has greater torsional stiffness.
Ideally, the subframe crossbars should match the position of the chassis frame
crossbars.
The subframe should have the same outside width as the chassis frame, and
follow the outer contour of this.
There must always be an end crossbar in the subframe. This will have different
designs, depending on the needs of the body. It also depends on whether the
structure needs to be strengthened or not.
Body Builder Manual Part II, Specific Book LCV
MAINTENANCE AND DAMAGE PREVENTION
ELECTRIC AND ELECTRONIC SYSTEMS
5 mm
min
WORK ON BASIC VEHICLE
APPENDIX
151
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