Fender Design - Wheel Arch Challenge

FEMDER DESIGN WHEEL ARCH CALCULATION:

• AIM: To calculate the wheel arc then it is european stansred wether the car will pass the stansred or not.

• INTURODUCTION: Wheel Arch is an arch shaped cavity in the fender bod, which houses a wheel. The main intention for the calculation of wheel arc radius is to position the wheel inside the fender body , because during motion the car tyres will tend to throw particles present on the road like sand, mudrocks, liquids etc . It has two important functions. It serves for the safety of pedestrians and other cars because the wheel is situated in the body of a vehicle. The second function is to protect the car from the 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.It is a curved part of the Fender positioned right above the Wheel. The Wheel Arch is designed such that it protects both the pedestrian and car cabin from mud, water rocks and other road spray Different countries have different wheel arch regulations in place, and the wheel arch design has to comply with them to be deemed usable in that country.

SUGGESTION TO THE STYLIS TEAM:

• The styling team is required to modify the styling surface of the fender such that the clearance "L" at sections SA, SC, SD and SE is equal to ar greater than 10 mm by increasing the curvature at those sections towards outside.To study the standard and regulations for fender design of wheel arch and analyse the data which is given in the question whether the wheel arc area will pass the standards or not.There are various standard which normally varies by region and their road structure like japanese,U.S AND europe,here we take european standard.

  INTRODUCTION TO FENDER:

  • Fender is a part of a car which is used to protect the sides of the engine compartment.
  • The fender is situated above the wheel of the car so that it can protect the side parts of the car and other vehicle which is moving nearby since the chips and debris thrown from the wheel in movement could cause damage.
  • The fender also reduces the pedestrian injury when there is a pedestrian vehicle collision and prevent throwing up of debris to nearby vehicles.
  • Usually the front fender is designed seperately,the rear fender come along with the body structure.
  • Pedestrian safety is also considered while designing wheel arch in fender since the debris in wheel should'nt hit them in the motion of the car.

  

  TYPES OF FENDER:

  Full-bumper type: This is a conventional type used in fender .This fender covers the wheel almost eighty percent which is shown in the image.

  Half-bumper type:This type of bumper helps in reducing the weight of fender at the same time it improves the safety of pedestrian moving.This type is shown in the above image in the introduction part.

  FENDER DESIGN CONSIDERATIONS:

  • Drip Area
  • Wheel arch
  • Baffle and ORVM mount area
  • frontal crash regulation and requirements.

  STANDARDS FOR DESIGNING FRONT FENDER:

  European standard for wheel arch: According to european standard clearance length for the wheel arch will be 10mm.

  wheel CTR is wheel center.SA,SB,SC,SD,SE are the points on the wheel from where it is projected to the whhel arch to measure the distance

EUROPEAN REGULATIONS:

1. Measure CL L at sections SA-SA SB-SB SC-SC SD-SD SE-SE and produce CL check chart to validate.
2. At all five sections the CL L value should be greater than 10 mm to satisfy the European regulations.
3. Wheel guard regmt: The value of 'a shall be more than 5 mm at a line 30* forward and 50* rearward from the central vertical axis of axis of wheel.

• ANALYSIS:
  • There are different regulations in this regard based on different regions. This analysis has been done according to European Regulations.
  • The part file was opened using NX CAD and the points were plotted on the wheel arch after taking the required measurements from the wheel centre.

THIS IS SB MEASUREMENT:

the gap between sb line and wheel arch is 10.0000mm.

THIS IS SA MEASUREMENT:

the gap between the sa line and wheel arch is 9.9490mm

THIS IS SC MEASYREMENT:

the gap between sc line and wheel arch is 0.113670mm.

THIS IS SD MEASUREMENT:

the gap between sd line and wheel arch is 2.9294mm.

THIS IS SE MEASUREMENT:

the gap between se line and wheel arch is 5.9973mm

TABULATION:

SECTION	REQUIED DISTANCE		CALCULATED DISTANCE		RESULTS
SA	10.000MM		9.9490MM		PASS
SB	10.000MM		10.000MM		PASS
SC	10.000MM		0.1136MM		FAIL
SD	10.000MM		2.9294MM		FAIL
SE	10.000MM		5.9973MM		FAIL

CONCULSION:

Acooding to European requirement the wheel arch is not good for manufacturing ,so styling team and design team should work on section SC and SD and SE. A designer telling him to modify the design and increase the gap there.