Fender Design - Wheel Arch Challenge

FENDER DESIGN - WHEEL ARCH CHALLENGE

- MAYANK TIWARI

Aim : To Calculate the Wheel Arch gap at required points and check whether the car passes the European standard.

Fender 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 passanger and padestrian from the projection of stone and mud.
• For the vehicle to has different permit in different countries , the wheel arch of fender must be compliant with the standard and regulation set by respective countries .

Different fender regulation by different countries are as follow -

European standard -

• The european regulation requires a pre- determined clearance or a minimum distance of 10 mmm to be maintained between the fender and respective tyre at particular points, along the tyre profile as shown below .
• Wheel guard requirement : The value of 'a' should be more than 5 mm at line 30 degree forward and 50 degree reward from the central vertical axis of the wheel .

US Regulations -

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

Japan Regulations -

• The clearance 'L' for is to be measured within area K and create clearance check chart to validate .
• The value of L should be greater than 5 mm at all point .
• Wheel guard requirement : The value of a should be more than 5 mm at line 30 degree forward and 50 degree reward from the central vertical axis of the wheel .

# Calculation of Wheel arch area according to European Regulations -

• A Datum plane is created at the outermost face of the wheel .
• Horizontal and vertical line is created from the center of wheel and making it as a reference.
• Create 30 degree and 50 degree line with respect to vertical line .
• Now take offset of 150mm from the horizontal line .
• Now create 5 point on plane and project it into the fender.
• Now measure the clearance 'L'.

Calculating clearance at different points :

1) clearance 'L' at SA-SA :

L=9.94 mm

2) clearance 'L' at SB-SB :

L= 10 mm

3) clearance 'L' at SC-SC :

L=0.11 mm

4) clearance 'L' at SD-SD :

L= 2.84 mm

5) clearance 'L' at SE-SE :

L = 5.90 mm

Measuring the clearance value 'a' for wheel guard requirement :

Clearance 'a' at 30 degree line :

a=46.13

Clearance 'a' at 50 degree line :

a=38.37

SECTION	L(> 10 MM)	RESULTS	a(>5MM)	RESULTS
SA-SA	9.94	FAIL
SB-SB	10	PASS	46.13	pass
SC-SC	0.11	FAIL	38.37	pass
SD-SD	-2.84	FAIL
SE-SE	-5.90	FAIL

Conclusion :

• We have check the clearance value of 'L' and 'a' for the european standard .
• From the table we can say that section SB-SB pass and all other section fails .