Fender Design - Wheel Arch Challenge

FRENDER DESIGN-WHEELARCH

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

INTRODUCTION:-

• Wheel arc calculation is necessary for the fender design to pass the local regulation which are based on the local road condition.
• Wheel arch is semi-circular area in fender, which houses the wheel well. It should have sufficient clearance between tyre and wheel arch. So, that its doesn’t touch the wheel arch area during suspension. The clearance value differ from region to region, here are few regulation.

Japanese standard:-

• Measure clearance L of tire, hub, cap & fender in the three different position within area K and produce clearance check to validate.
• Clearance must be greater than 5mm in the all the three position.
• Wheel guard reqmt: the value of ‘a’ shall be more than 5mm at a line 30deg forward and 50deg rearward from the center vertical axis of axis of wheel.

European Regulation Standard:

The clearance value will be more than 10mm at 30 degrees forward and 50 degrees backward and line 150mm above X-axis and Mid-point between 50 degrees and the line above 150mm.

US Regulation Standard:

Make clearance check details on all position from -10 to 180 degrees. All values must be greater than 5mm.The Clearance Value will more than 5mm at line 30 degree forward and 50 degree backward from central vertical axis.

Wheel Arc Calculation:-

This is carried out for pedestrian safety of the car, here by using the European regulation's requirement to define the design given for calculation.

As required to plot the coordinates

Figure 4 plotting the checking point on the plane.

In figure 4 the following coordinates SB, SB, SC, SD, and SE are plotted using the angles and dimensions according to the required standard.

Next, the points are checked if they provide a gap of 10mm from the outer part of the fender to the outer most of the tier, if it is more than 10mm it meets the safety requirement if it is below 10mm it doesn’t meet the standard.,

Figure 5 Law extension of 10mm towards the fender

In figure 5 you can see the law extension of 10mm towards the fender is done, we can see that SA and SB have a clearance of more than 10mm whereas the remaining check points don’t meet the standard.

The above figure shows the following result

• SB plot satisfies the 10mm distance
• SA plot satisfies the 10mm distance
• SC plot doesn’t satisfy, there is a 3.8mm clearance which doesn’t go with the standard.
• SD plot doesn’t satisfy, there is 0.25mm clearance which doesn’t go with the standard.
• SE Plot doesn’t satisfy, there is -3.4mm clearance which doesn’t go with the standard.

Conclusion

Hence we can declare that the following fender wouldn’t pass the standards the styling team must redesign the fender.