Design of backdoor
DESIGN OF BACK DOOR
Aim: To use the provided styling surface to come up with a back door design, use appropriate design methodologies, and provide the necessary reinforcements and embosses
Car Back Door
The trunk or boot of a car is the vehicle's main storage or cargo compartment, often a hatch at the rear of the vehicle. It is also called a tailgate. The trunk or luggage compartment is most often at the rear of the vehicle. Early designs had an exterior rack on the rear of the vehicle to attach luggage trunk. Later designs integrated the storage area into the vehicle's body, and eventually became more streamlined. The main storage compartment is normally provided at the end of the vehicle opposite to which the engine is located. Some mid-engined or electric cars have luggage compartments both in the front and in the rear. The door or opening of a cargo area may be hinged at the top, side, or bottom. If the door is hinged at the bottom it is called a tailgate, particularly in the United States. They are used on station wagons and pickup trucks, as well as on some sport utility vehicles (SUV). Traditional U.S. station wagons included a roll-down window retracting into the tailgate to load small items or to allow the tailgate to be opened down on its bottom-mounted hinges. Because of the potential for carbon-monoxide fumes, the tailgate window on station wagons should be closed whenever the engine is running. Two-way station wagon tailgates may be hinged at the side and the bottom so they can be opened sideways like a regular door, or drop downwards as load platform extenders. They are designed with special handles for opening in the selected direction on special hinges after the window is lowered. A three-way design that was also used by Ford allows for the tailgate to be opened like a door with the window up. General Motors developed a clam shell style "disappearing" design where the rear window rolls up into the roof and the tailgate slides down and beneath the load floor. If the door is hinged at the top it is termed a hatch, and is used on a hatchback. A bottom opening door is now common on SUVs.
Car Back Door Parts
The car back door has parts like:
1. Back door inner panel
It is the inner most part of the back door assembly, where the embosses and areas for mastic sealings are made.
2. Back door outer panel
It is the outer part of the back door, which we see from outside and has to be aesthetically good.
3. Hinge & gas stay reinforcements
These are the reinforcements used to provide strength in hinge and gas stay mounting areas.
4. Latch
This is the locking mechanism of back door.
5. Gas stays
These are the support stays of the back door, which will help easy opening of the heavy back door and to hold the back door in the opened position.
Back Door Inner Panel Design
Isometric view:
Front view:
Side view:
Draft Analysis of Back Door Inner Panel
Here a draft angle of 7degree is provided. The green region indicates surfaces with positive 7 degree draft angle.
Back Door Outer Panel Design
Front view:
Rear view:
Side view:
Draft Analysis of Back Door Outer Panel
Here a draft angle of 7degree is provided. The green region indicates surfaces with positive 7 degree draft angle.
Back Door Inner Panel Reinforcements Design
Closer view of latch reinforcement:
Draft Analysis of Back Door Inner Panel Reinforcements
Here a draft angle of 7degree is provided. The green region indicates surfaces with positive 7 degree draft angle.
Final Assembly:
