Fender Design

FENDER DESIGN

AIM: To design a front fender of a car by following the given master section as per the design considerations of OEM.

INTRODUCTION :

Fender is the american english term for the part of an automobile, motorcycle or other vehicle body that frames a wheel well. Its primary propose is to prevent sand, rocks, mud, liquids, and other road spray from being thrown into the air by the rotating tire. Fender are typically rigid and can be damaged by contact with the road surface.Sticly materials, such as mud, may adhere to the smooth outer tire surface, while smooth loose objects, such as stones, can be 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 trie is rotating upward and forward, and can throw objects into the air at other vehicle or pedestrians in front of the vehicle. Fender is a front outer side member of a car, which covers the wheel side. It has so many small features with ups and downs.

FENDER

It is an aesthetic component/part of a car that frames the wheels. Prevention of sand, mud particles, and other road contaminants from being thrown into the engine compartment and also to the pedestrians by the rotating tires are the main purpose served by the fenders.

The front fenders are separate components whereas the rear fenders are integrated with the body sides.

Types of FENDERS

They are two types of Fenders

• Half Bumper Type
• Full Bumper type

1.Full Bumper Type:--

The full bumper type fender was used in old cars, it covers the full area until the front lighting. But it has a lot of sheet metal material which is un-necessary and increases the weight of the fender. These type fenders are no longer used in the automobiles.

2.Half Bumper Type:--

Half bumper fender is used because the waste of material is less & can produce two fender at the same time by slightly increare the raw sheet. and to reduce the weight & cost mostly bumper fender are been produced.

MOUNTINGS FOR FENDER:--

There are 5 Mounting Points in a Fender

1. BODY MOUNTING
2. A- PILLAR MOUNTING
3. SILL MOUNTING
4. COWL MOUNTING
5. DRIP MOUNTING

MATERIAL USED IN FENDER DESIGN

We can find modern fenders made from steel, aluminium, thermoplastic, and fibreglass. Steel is the most rigid and abrasion-resistant material used in making fenders. They offer the best protection from large debris and are less likely to dent. Aluminium offers the strength of metal without the heaviness of steel.

Manufacturing Process:

A vehicle Fender monitor is made by an interaction called reaction injection moulding (RIM), which basically includes making a one-of-a-kind polyurethane compound and bringing it into an immense fender. RIM is a methodology that screens unrefined materials and lessens costs. It resembles injection moulding beside thermosetting polymers are used, which requires a reestablishing reaction to occur inside the shape. Normal things made through RIM join vehicle monitors, air spoilers, and fenders.

DESIGN OF DRIP AREA MOUNTING :

• It is the important mounting unit 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 fender
• 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.

• DESIGN OF 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.

DESIGN OF BUMPER MOUNTING AREA :

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

DESIGN OF 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.

DESIGN OF BAFFLE MOUNTING AREA :

Baffle mounting or mudguard are clip fit type of mounting on the inner side of the fender arch over the Tyre. it protects the car engine compartment and pedestrians from causing injuries from chip out debris on the road when the car is in motion . they are mounted on the fender using a special type of locking clips which are made up of plastics .

APPLYING OF THICKNESS TO THE SURFACE .

The thickness of 0.75 mm inward on the final sewed surface of the fender to the sheet metal parameters

DIFFERENT VIEWS OF FENDER :

Purpose of Fender :

Cleanliness : Protect the car, occupants and passers by from items, water, mud, snow, ice, thrown off the tires as you drive.

Safety : Protects pedestrain from the wheel, e.g. its better to be it by a laterally moving fender than a rolling tire, keeps loose, streaming items from being wrapped up in a rolling wheel.

Aerodynamics : Smooths the car profile so you don't get a lot of drag off the uncovered wheels. Some fenders are enclosed on the side for this.

General Appearance : Looks better with fender, gives a finished look, looks more streamlined.

CONCLUSION : Thus, all mounting areas for the fender designed from skin data and master section is done by following all design rules .