Fender Design - Wheel Arch Challenge
Wheel arch:
Wheel arch is a shape of an fender material which helps to cover the entire tyre for redusing the chiping of stones, mud and other particles while on the go. It also mainly helps to save the pedestrians while on impact ny saving then from crushing and hiting to the car. It also helps for the looks of car. There are so many kinds of wheel archs are there. The revolution comes as follows.
The above shown are some examples for the different wheel arches from old to the newer cars. Now we have to know the regulations of different wheel arches according to the different standards like japan, european and U.S. Every country has its own regulations and standards according to its roads and saftey conditions.
As per the japan and the U.S standards the wheel arch clearance will be around 5mm at three different areas. For the european standards clearance should be 10mm.
This distance should calculated from the tyre side wall to the inner portion of the wheel arch as shown below.
Japan standards:
According to the japan government as per their road conditions at A, B and C pints on the arch which are located occording to 30 and 50 degrees of draft angle it should satisfy the standards by having the clearance between wheel and the arch of about 5mm in those points then the model will get approves with their standards.
European standards:
These are the standards most of countries lie on some segment of car because it is having the more clearance between wheel and arch among all. case study follows almost the same procesure as japan but in extra it have another two points. Which is taken above 150mm from 0 degress and after that we draw a line between at a distance of half of them i.e., SD. At all these four points it should satisfy the clearance of having 10mm to satisfy the europeon standards.
U.S standards:
As shown below figure US stardards needs 5mm of clearance between wheel and the arch at every 10 degrees od interval as shown below.
European case study:
Now we have to calculate the clearance between the tyre and the wheel arch for the given design shown below.
For calculating the distance between arch and tyre we have sketch some circles and lines at certain angles as given in the above europe standards. After that as per the europe standards we will get some desired locations where we have to check the clearances at different areas where it should satisfy the 10mm clearance as per european requirements. We indians also follows some of their standards which suits to our road conditions in the segments.
from the above pictures we can study the clearance between wheel and arch as showw above with the distances. Those are shown in the tabulated form below.
| MEASUREMENT POSITIONS | CLEARANCE |
| At -30 degrees | 10 mm |
| At +50 degrees | 1.38 mm |
| At +58.75 degress | -0.114 mm |
| At +67.5 degress | -0.2 mm |
Conclusion:
After all these abobe case study the given fender has been calculated for the european standards as shown above. So as per the european standards the distance between the tyre and the wheel arch
should be around 10mm but it only satisfy the european standard in one region the other differs one other as shown. So now by this detailed case study we can conclude that this given fender design
does not satisfy the european safty standards clearly so we have to advice the fender design engineer for remodel the wheel arch as per the european government regulations.