Fender Design - Wheel Arch Challenge

Aim: To decide whether the given design passes the European standards or not.

Given Design:

European Regulations Requirement:

EUROPEAN REGULATIONS REQUIREMENT

Measure CLL at sections SA-5A 58-88 sc-sc 50-80 SE-SE and produce CL check chart to validat Mall five section the CL value

should be greater than 10 mm to

1. Take the outline of the wheel and the

fender. 2. Make the centre of the wheel circle.

3. Draw horizontal and vertical perpendicular axes from the centre of the wheel circle.
Make a point on the fender line at 150mm from the horizontal.

6. Extend a line to this point from the centre.

7. Then make a line that is exactly between the 50-degree line and the line made on the 150mm point.

• Measure the distances between the points on the wheel circle and fender curve. All of these should be greater than 10mm to satisfy the European regs.

Secondly, the horizontal distances from SA, SB, and SC points to the fender curve should be at least 5mm.

• Check whether the design passes these conditions and conclude whether it can pass the European Regulations Requirement.

Challenge:

Sketch has been made.

Now let us measure the distances between the points at the 5 sections.

SA-SA

26.029 mm > 10 mm

SB-SB

42.599 mm > 10 mm

SC-SC

36.261 mm > 10 mm

SD-SD

43.685 mm > 10 mm

SE-SE

47.685 mm > 10 mm
Now to find the horizontal distance between the wheel and the fender. This distance should be at least 5mm from SA point, SB point, and SC point.

Project the made sketch onto the plane of the wheel.

Distance between SA point and fender outer curve = 9.949 mm (pass)

Distance between SB point and fender outer curve = 10 mm (pass)
Conclusion:

The given design satisfies all European standards but one, i.e. the distance from SC point to the fender curve (which is just 0.114 mm), which is way below the recommended 5 mm minimum distance. Therefore, this fender cannot pass the European standards. The design should be reverted back to the class A designer telling him to modify the design and increase the gap there.