Fender Design - Wheel Arch Challenge

AIM : Prepare a report explaining the different fender regulations and Calculate the Wheel Arch gap at required points and check whether the car passes the European standard.

Fender : Fender is the American English term for the part of an automobile, motorcycle or other vehicle body that frames a wheel well (the fender underside). Its primary purpose is to prevent sand, mud, rocks, liquids, and other road spray from being thrown into the air by the rotating tire. Fenders are typically rigid and can be damaged by contact with the road surface.

Fender Wheel Arch : Wheel Arch is the semi-circular part of the fender positioned above the wheel of the vehicle. The design of the wheel arch of the fender should be such that it must shield wheels and protect both passengers compartment and pedestarians from the projection of watr, mud and stones.

Different Fender Regulations :

1. Japan Recquirement :

• Measure clearance L of tire, hub, cap & fender in three different posittions within area K and produce clearance checck chart to validate.
• Clearance must be greater than 5 mm in all the three positions.
• Wheel guard requirement : The value of 'a' shall be more than at a line 30 degree forward and 50 degree rearward from the central vertical axis of wheel.

2. European Regulations Requirement :

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

3. US Regulation Requirements :

• Make clearance check details on all positions from -100 degree to 100 degree & make the clearance check table.
• All values should be greater than 5 mm to satisfy the regulations.
• The value of 'a' shall be more than 5 mm at a line 30 degree forward and 50 degree rearward from the central vertical axis of wheel.

Calculating Wheel arch gap :

First we will draw all the 5 lines on a plane on the outermost part of the wheel, then draw point of intersection of wheel arch lower edge and all 5 lines then project all 5 points to the wheel arch face of fender.

then measure horizontal gap between wheel and all that points.

For point E : Gap = 6.34 mm (Negative)

For point D : Gap = 3.0343 mm (Negative)

For Point C : Gap = 0.1124 mm (Negative)

For Point B : Gap = 9.949 mm

For Point A : Gap = 10 mm

Points	Measured values (mm)	Values according to European Regulations (mm)	Remarks
A	10.00	10	GO
B	9.949	10	NOGO
C	- 0.1124	10	NOGO
D	- 3.0343	10	NOGO
E	- 6.3395	10	NOGO

Conclusion : In this report we see that there is only one point in the given fender wheel arch model is good to go but all other four points do not satisfies European Regulations, in which three points have negative gaps.

Therefore Calculation of the Wheel Arch gap at required points and checking of whether the car passes the European standard is completed.

Thank You!