Challenge

Fender Design - Wheel Arch Challenge

MMonodeep Das12 Dec 2022

FENDER WHEEL ARCH CHALLENGE

AIM- Calculate the Wheel Arch gap at required points and check whether the car passes the European standard.

FENDER WHEEL ARCH

Wheel arch is a semi-circular part of the fender positioned above the wheel of the vehicles. The design of the wheel arch of the fender in such a way that to shield the wheels throwing stones, muds, snow or water to the pedestrians & also protect the passenger compartment. This also not only protect the engine compartment for any debris going inside & damage the mechanical components, BIW areas. The are different design standard setup in different parts of the countries which has been implied for the safety standard for pedestrians & for the vehicles.

There are 3 rule & regulation standards to design the fender wheel arch-

JAPAN STANDARD
EUROPEAN STANDARD
S/AMERICAN STANDARD

So, lets discuss about all the 3 standards to design the wheel arch

JAPAN STANDARD

Measure clearance ‘L’ of tire, hub, cap & fender in 3 different positions within area & produce clearance.
Clearance must be greater than 5mm in all the three positions (i.e., ‘A’, ‘B’,’C’).
The value of ‘A’ shall be more than 5 mm at a line 30 degree forward & 50 degree backward from the central vertical axis of the wheel.

EUROPEAN STANDARD

Measure CL ‘L’ at section SA-SA, SB-SB, SC-SC, SD-SD, SE-SE & produce CL.
At all 5 section the CL ‘L’ value should e greater than 10mm to satisfy the European regulations.
The value ‘a’ be more than 5mm at a line 30 degree & 50 degree backward from the central vehicle axis of axis of wheel.

U.S/AMERICAN STANDARD

Make clearance & check details on all position from 100 degree to 100 degree to make the clearance.
All values should be greater than 5mm to satisfy the U.S/American regulations.
The value ‘a’ shall be more than 5mm at line 30 degree forward & 50 degree backward from the central vertical axis of wheel.

METHODOLOGY OF DESIGNING WHEEL ARCH IN EUROPEAN STANDARD

The skin data was given already & need to calculate whether it is reaching the match of the European standard.
Create the datum plane on the middle of the wheel.
Sketch the design on the new datum plane which is generated.
Draw horizontal & vertical perpendicular axes from the centre of the wheel circle.
Draw 30 degree forward from the central axis line & 50 degree from the centre.
Make a 150mm line from the horizontal axes to the end point of the fender arch.
Extent a line to this end point on the fender arch from the centre of the wheel.
Make a line that exactly between 50 degrees line & the line made on the 150mm point.
Offset the fender arch
Mark the point on the fender arch where the lines are intersecting where 5 points are generated.
Projects the points on the fender arch through projection curve.
As a result, need to calculate the distance between the actual point & projected points.

Now let us measure the distance between the 5 sections-

SECTION SB-SB