Challenge

Fender Design - Wheel Arch Challenge

PPatil Gaurav28 Aug 2022

AIM :

THE calculate the Wheel Arc area and prove whether the car will pass the standards or Not.

Fender :

Car fenders provide safety to the driver and the passengers at the time of accidents or collisions. They are manufactured in a way to provide bend during front and side collisions. Car fenders are designed to avoid wind resistance and make your car more aerodynamic. Car fenders enhance the overall look of your car.

Wheel arch :

The wheel arch is designed considering all possible motions the tire undergoes while the vehicle is in motion. The wheel arch also ensures stopping any debris that could possibly fly outside the wheel well and hit pedestrians. HIGHLIGHTED PART IN IMAGE IS CALLED WHEEL ARCH.

Fender wheel arch regulations :

Arch fenders were introduced to improve upon the performance of Cylindrical fenders. Arch fenders have a better Energy / Reaction force ratio and are recommended for all types of applications. The shape of these fenders helps to dissipate the stresses evenly. These extruded fenders are very easy to install and are maintenance-free. They are generally preferred for small to medium range vessels

European Standards :

The Clearance ‘L’ should be measured at sections SA-SA, SB-SB, SC-SC, SD-SD and SE-SE and create clearance check chart to validate
At all the five sections the value of L should be greater than 10mm to satisfy the European Regulations
Wheel guard requirement: The value of ‘a’ should be more than 5mm at line 30° forward and 50° rearwards from the central vertical axis of the wheel

Japanese Standards :

The clearance ‘L’ for tire, hub, cap and fender is to be measured within area K and create clearance check chart to validate
The value of L should be greater than 5mm at all positions
Wheel guard requirement: The value of ‘a’ should be more than 5mm at line 30° forward and 50° rearwards from the central vertical axis of the wheel

US Standards :

Clearance ‘L’ is to be checked at all positions from -100° to 100° and create clearance check chart to validate
The value of L should be greater than 5mm to satisfy the regulations
Wheel guard requirement: The value of ‘a’ should be more than 5mm at line 30° forward and 50° rearwards from the central vertical axis of the wheel

Calculation of wheel arch area according to European standards :

For calculation of clearance between Wheel Arch and Wheel we have to create a sketch on the outer most face of the wheel. The procedure of which is given below.

A Datum Plane is created at the outermost face of the wheel
The sketch is created on the new Datum Plane
A Horizontal line is drawn across the centre of the wheel
A perpendicular line SA is dropped at the centre of the wheel
Two lines SB and SC are created at 30° forward of SA and 50° rearward of SA respectively
A point is created 150mm vertically above the centre line
A line SE is drawn from the wheel centre and passes from the point created
Another line SD is drawn from the centre of the wheel and in the middle of lines SC and SE

Obtaining the clearance L at the designated 5 points:

The clearance distance 'L' is calculated at points SA-SA, SB-SB, SC-SC, SD-SD and SE-SE, which should be greater than or equal to 10mm

i.) Clearance 'L' at SA-SA

L = 14.952mm (Pass)

ii.) Clearance 'L' at SB-SB

L = 15.00mm (Pass)

iii.) Clearance 'L' at SC-SC

L = 5.18mm (Fail )

iv.) Clearance 'L' at SD-SD

L = 2.551mm (Fail)

v.) Clearance 'L' at SE-SE

L = 3.357mm (Fail)

Measuring the clearance vlaue'a' for Wheel Guard Requirement:

i.) Clearance 'a' at 30° line SB

a = 45.636 mm

ii.) Clearance 'a' at 50° line SC

a= 38.462mm