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TM 9-8000
Figure 30-14. Auxiliary Spring Suspension.
With a light load, the springs make contact with the outer
two axles joined by a single cross support (trunnion axle)
edges of the bearing plates; hence, the effective length
that acts as a pivot for the entire unit.  The tubular
of the spring is comparatively large and has a low load
trunnion axle is attached rigidly to the frame through the
rating. Heavy loads deflect the spring, causing the points
mounting pads by two support brackets and the girder
of contact to move toward the inner edges of the bearing
The ends of each spring rest on
plates. The effective length of the spring then becomes
hardened steel bearing plates on the two axle housings,
shorter, giving a higher load rating.
the spring being supported on the vehicle frame by
means of a spring seat on each end of the trunnion axle.
Both springs are clamped on their spring seats by means
30-11. Axles. Two rear axles are used on numerous
of spring clips.
heavy vehicles to decrease the load on each rear wheel,
decrease the effect of road shocks, and increase
Both spring seats are mounted on a spindle on each end
traction.  A typical rear end on six-wheel vehicles
of the trunnion axle. Tapered roller bearings take side
consists of an axle mounted on each end of the rear
thrust imposed on the spring and allow it to pivot easily.
springs. The load of the vehicle is applied at the center
Springs with very high load ratings must be used with
of the spring by means of a spring seat supported on the
this suspension because they carry the entire weight of
frame. The drive is applied to the foremost of the two
the rear end.  Mounting the springs on central pivots
axles, with the rear axle trailing, or it is applied to both
enables them to distribute half of the rear end load to
axles by means of an interaxle differential, which
each axle. As a result, the load on the rear of the vehicle
ensures equal driving effort on both axles.  The rear
is distributed over four wheels, allowing a vehicle to carry
springs carry the same load they do with a single rear
much heavier loads than a single rear axle vehicle
axle, but the load is distributed over two axles instead of
without exceeding the safe tire load. When one wheel is
deflected from a road shock, the spring pivots about its
center so that both ends of the spring deflect to absorb
30-12. Bogie Axles. A large proportion of six-wheel
vehicles have bogie axles. A bogie is a suspension unit,
such as shown in figures 30-15 and 30-16, consisting of


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