Design of backdoor

BACK DOOR

Definition:-

• The back door is also known as a “TAIL GATE”. A back door is hinged part which is used for entry and exit of a vehicle.
• Back door are one of the type of doors of the vehicle which are located next to the passenger seat which provides access to the luggage compartment.
• In most of the cars, these back doors are operated with the help of gas stay which turns in turn reduces the effort required to lift open the door.
• In some luxurious car back doors are powered by an electric motor. This kind of system is also called a power trunk lid system.
• Hatchback or station wagons are sold as 3 doors or 5 doors models. In this case, the rear hatch is classified as door this is because it enters the passenger compartment.
• Back door is mainly made of below 7 parts.

Types Of Back Door By Opening Condition:-

1. Top mounted back door:-

2. Side mounted back door:-

2. Bottom mounted back door:-

Back Door Inner Panel Components:-

1. Embosses:-

The implement of embosses are very important on the inner hood since it plays an important role in saving human life during crash from the back. The embosses are designed in the Y & V direction so during the crash the forces dissipates outwards as shown in figure.

2. Reinforcements:-

In back door to accommodate Latch & striker, Hinges & Gas stay. We have to remove some material which will result in loss of strength of the material locally. Hence to improve strength locally we provide these reinforcements. The reinforcements provided in the latch and striker reinforcements & the reinforcements provided in the Hinge are called Hinge Reinforcements and reinforcements provided in the Gas Stay region is called Gas stay reinforcements.

The embosses are provided in the reinforcements to avoid the tearing of the parts. Diabolo embosses are provided both in reinforcement & in the inner panel body.

3. Latch & striker and hinge position:-

For the proper opening and closing of the backdoor, the striker should be perpendicular to the trajectory of the back door. Firstly the hinge is positioned and an axis is drawn as shown in figure. The trajectory is derived from the hinge axis and the centre distance from the striker. It is denoted as a circle as shown in the figure

Hemming:-

Hemming is forming operation in which edges of the sheet are folded or folded over another part in order to achieve a tight fit. Normally, hemming operation are used to connect parts to gather, to improve the appearance of a part and reinforce part edges.

Hemming is used in assembly as a secondary operation after deep drawing, trimming and flanging operation to join two sheet metal together. The accuracy of hemming operation is very important since it affects the appearance of the surface and surface quality.

Back Door Images:-

Conclusion:-

The design of the back door BIW was completed with the engineering standard and all the reinforcements.

Back Door Design Google Drive Link:-

https://drive.google.com/file/d/1GcRim_Br35zzWgbLojv2nguXfKj2FYbV/view?usp=sharing