A diagram showing a side and underside view of an 18-wheeler semi-trailer truck with an enclosed cargo space. The underside view shows the arrangement of the wheels, and in blue, the axles, drive shaft, and differentials.
The numbered parts are:
tractor unit
semi-trailer (detachable)
engine compartment
cabin
sleeper (not present in all trucks)
air dam
fuel tanks
fifth-wheel coupling
enclosed cargo space
landing gear (legs for when semi-trailer is detached)
A diagram showing a side and underside view of an 18-wheeler semi-trailer truck with an enclosed cargo space. The underside view shows the arrangement of the wheels, and in blue, the axles, drive shaft, and differentials.
The numbered parts are:
tractor unit
semi-trailer (detachable)
engine compartment
cabin
sleeper (not present in all trucks)
air dam
fuel tanks
fifth-wheel coupling
enclosed cargo space
landing gear (legs for when semi-trailer is detached)