Fender Design

DESGIN OF FENDER

OBJECTIVE

Draw the drip area, sillmount area, bumper area and A-pillar mount area.

FENDER :

Fender is the part of an automobile, motorcycle or other vehicle body that frames a wheel well (the fender underside). Its primary purpose is to prevent sand, mud, rocks, liquids, and other road spray from being thrown into the air by the rotating tire. Fenders are typically rigid and can be damaged by contact with the road surface.

Sticky materials, such as mud, may adhere to the smooth outer tire surface, while smooth loose objects, such as stones, can become temporarily embedded in the tread grooves as the tire rolls over the ground. These materials can be ejected from the surface of the tire at high velocity as the tire imparts kinetic energy to the attached objects. For a vehicle moving forward, the top of the tire is rotating upward and forward, and can throw objects into the air at other vehicles or pedestrians in front of the vehicle.

Types of Fender

1) Full Bumper Type

2) Half Bumper Type

1. FULL BUMPER TYPE: These types of fenders were used in earlier models of vehicles. They contribute to the major increment of the steel weight by just covering the front headlights with respect to the bumper region. The problem associated with this kind of fender is there is a lot of wastage in the blank and every inch of a material is a cost to the industry.

2. HALF BUMPER TYPE: These fenders are mainly used for serving the purpose of cost-cutting and reducing enough proportions of the steel wait resulting in a reduction of the weight of the vehicle slightly. They can be economically manufactured, i.e by slightly increasing the blank size, we can produce two fenders at a time.

DESIGN CONSIDERATIONS

The front fender has basically five mounting positions with respect to the other components. The mounting positions are as follows:

1. Drip Mounting area
2. A-Pillar Mounting
3. Sill Mounting
4. Bumper Mounting
5. Baffle Mounting

MASTER SECTION

DRIP MOUINTING AREA :

• It is the important mounting uni of the fender . it is connected with the engine compartment , therefore the lot of design constraints are to be followed while designing the fender.
• While designing the drip area we have to initially leave 200-300 mm for cowl top.
• For placing the headlamp we have to leave at least 150 mm at the front while designing the fende.
• Cowl top part consists pf wiper motor and its instruments.
• Two darts are added on the longer side of the drip area in order to provide the stiffness and adds strength to the part . This helps the fender to not to vibrate and impact the forces outside of the fender during motion of the vehicle.
• Embossing are provided on the mounting to strengthen them during fastening.

A-PILLAR MOUNTING AREA :

The A -pillar is the structural pillar that combines the body to the roof . this make the sides of the windshield rest . front fenders are fastened to the A -pillar to form a robust structure.

SILL MOUNTING AREA :

Sill is the panel directly below the bottom of the door supporting the floor and may be used to combine the floor and the body . The bottom end of the fender is mounted on the sill body for reinforcement of the fender panel , thus the sill mounting position is designed with holes and emboss . M5 fasteners are used to fix the fenders on the sill body.

BUMPER MOUNTING AREA :

Bumper mounting area is used to fix the plastic bumper to the fender with the help of the fasteners.

BAFFLE MOUNTING AREA:

These mounting points are created for attaching plastic components i.e baffle which prevents chipping inside the engine compartment.

CONCLUSION :

Finally design of fender is done with the help of NX-CAD software by following the master section.