Roof Panel
The roof panel is one of the largest of all major body panels and it is also one of the simplest in construction. The area which the roof covers varies between different makes and models of cars. On some cars, the roof panel extends downwards around the windscreen so that the windscreen opening is actually in the roof. On some cars the roof ends above the rear window, while on others it extends downwards so that the rear window opening is in the lower rear roof. When this is the case the roof panel forms the top panel around the rear boot opening. Some special body designs incorporate different methods of rear window construction, which affects the roof panel; this is particularly true for estate cars, hatchbacks and hardtop convertibles. Alternatively the top is joined to the rear quarter panel by another smaller panel which is part of the roof assembly.
The stiffness of the roof is built in by the nature given to it by the forming presses, while reinforcements, consisting of small metal strips placed crosswise to the roof at intervals along the inside surface, serve to stiffen the front and rear edges of the windscreen and rear window frames. In some designs the roof panel may have a sliding roof built in or a flip-up detachable sunroof incorporated.
Rear Quarter Panel or Tonneau Assembly
This is integral with the side frame assembly and has both inner and outer construction. The inner construction comprises the rear wheel arch and the rear seat heelboard assembly. This provides the support for the rear seat squab in a saloon car; if the vehicle is a hatchback or estate car, the two back seats will fold flat and the seat squabs will need no support. This area is known as the rear bulkhead of the car; it gives additional transverse strength between the wheel arch sections and provides support from the rear seat. The rear bulkhead also acts as a partition between the luggage and passenger compartments.
Rear Wheel Arch Assembly
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