Hood design-Week 2

Hood design

Here we are going to understand and design the concept of front-mounted engines hood according to the standards. The hood or bonnet is the hinged cover over the engine of motor vehicles that allows access to the engine compartment, or truck for maintenance and repair.

On front-mounted engine cars, the hood may be hinged at either the front or the rear edge, or in earlier models, it may be split into two sections, one each side, each hinged along the centerline, a further variant combines the bonnet and wheel arches into one section and allows the entire front bodywork to tilt forwards around a pivot near the front of the vehicle.

Materials

Hoods are typically made of the same material as the rest of the body work. This may include steel, aluminum, fiberglass, or carbon fiber. However some aftermarket companies produce replacements for steel hoods in fiberglass or carbon fiber to make the vehicle lighter.

Before we dive into the design let us understand the rules and regulations standards for designing the hood.

• A perfect hood design means it should have a great impact distribution angled outside the car.
• In japan and Europe, regulations have come into effect that places a limit on the severity of pedestrian head injury when struck by a motor vehicle. This is leading to more advanced hood designs, as evidenced by multicore hood inner panel designs.
• European enhanced vehicle-safely committee (EEVC) European new car assessment program (euro NCAP).

Parts of hood design

1. Inner panel

• The hood inner panel is required to have a high initial reaction force against the impact exerted on the hood to enhance the energy absorption capacity. The hood is further required to minimize a Reduction of a reaction force by deformation in a collision.
• It is an object of the present invention to provide a hood inner panel capable of reduction of a reaction force of the hood inner panel even if a level of deformation of a hood of a vehicle increases and ensuring a sufficient energy absorption capacity.
• In the inner panel only we can research and implement the safety of pedestrians and as well as the driver. This panel only we can attach the reinforcement, embossed, mastic points etc.

2. Embossed in sheet metals

The metal sheet embossing operation is commonly of accomplished with a combination of heat and pressure on the sheet metal, depending on what type of embossing is required. Theoretically, with any of these procedures, the metal thickness is changed in its composition.

3. Deep drawing

Deep drawing is a manufacturing process that is used extensively in the forming of sheet metal into a cup or box-like structures. Pots and pans for cooking, containers, sinks, automobiles parts, such as panels and gas tanks, are among a few of the items manufactured by sheet metal deep drawing.

4. Hemming in sheet metal

Hemming is a sheet metal forming process in which sheets are joined by blending it usually to 180 degree. Automotive body panels and automotive parts such as deck-lids, doors, hoods, and tailgates are formed by hemming processes.

5. Mastic data

They can provide thermal and acoustical insulation, and may serve as fire barriers they may have electrical properties, as well. Sealants can also be used for simple smoothing or filling. They are often called upon to perform several of these functions at once.

Hood Components

• Latch

A hood latch is a very simple component. It’s basically the fastener that keeps your hood closed shut. This latch ensures that your hood is securely connected to your vehicle and that it doesn’t pop open unexpectedly.

When tension is applied to the cable from the hood release handle, it pivots the secondary latch, which pulls away from a retaining seat located under the hood. By design, the secondary latch then releases the hood a few inches before a safety latch takes over.

• Hinge

Hinge is a component that fixes the hood to the fenders of the car. The latch must be fixed perpendicular to the hinge axis so that the hood opens or closes properly.

• Latch trajectory motion

While opening or closing the hood, the latch must be perfectly aligned to the fixing or striker point. For that, the latches trajectory must be perpendicular to the hinge axis.

hood design views

1.Isometric

2. front view

3. left view

4. top view

Conclusion

Therefore we have designed a hood that falls under the rules andd regualtions of the manufacturerer's standards.