Figure 8-3.Integrated frame and body.
integral frame and body construction. In a truly
integrated structure, the entire frame-body unit is
treated as a load-carrying member that reacts to all
loads experienced by the vehicle-road loads as well as
Integrated-type bodies for wheeled vehicles are
fabricated by welding preformed metal panels
together. The panels are preformed in various
load-bearing shapes that are located and oriented so as
to result in a uniformly stressed structure. Some
portions of the integrated structure resemble framelike
components, while other resembles bodylike panels.
This is not surprising, because the structure must
perform the functions of both of these elements.
An integrated frame and body type construction
allows an increase in the amount of noise transmitted
into the passenger compartment of the vehicle.
However, this disadvantage is negated by the
Substantial weight reduction, which is possible
when using a well-designed unitized body
Lower cargo floor and vehicle height
Protection from mud and water required for
drive line components on amphibious vehicles
Reduction in the amount of vibration present in
the vehicle structure
TRUCK FRAME (LADDER)
The truck frame (fig. 8-4) allows for different
types of truck beds or enclosures to be attached to the
frame. For larger trucks, the frames are simple, rugged,
and of channel iron construction. The side rails are
parallel to each other at standardized widths to permit
the mounting of stock transmissions, transfer cases,
rear axles, and other similar components. Trucks that
are to be used as prime movers have an additional
reinforcement of the side rails and rear cross members
to compensate for the added towing stresses.
Frames require little, if any, maintenance.
However, if the frame is bent enough to cause
misalignment of the vehicle or cause faulty steering,
the vehicle should be removed from service. Drilling
the frame and fishplating can temporarily repair small