Fender Design - Wheel Arch Challenge

Wheel Arch Calculation Using NX CAD 

 

     Wheel Arch :

• The wheelarch is the semicircular part positioned above the wheel of a vehicle. It should be placed and design in such a way that it could protect Engine Compartment, Pedestrian from the splashing of water, mud & stones etc.…
• The Wheel arch design must be fulfilled all the Regulatory & Standard requirement in the different country
• There are different standard for clearance between the fender and the wheel in different country
• Japan Standard
• European Standard
• American Standard

                                                  .

Aim/Objectives: The Main objective here to calculate/measure the wheel arch area & to prove that if this will qualify the European standard or Not.

Regulation	Japan	European		American
Check Point	3	5		21
Clearance Condition	>5mm	>10mm		>5mm
Clearance Check (Top View)	End point of Line (Side view), projected on outer edge of tire & Fender in top view for evaluation of clearance
Lines through Center point of wheel arch (Side view)	Vertical (90°) Forward (30°) Backward (50°)		Forward (30°) 50° between the midpoint arch & above X-axis with vertical length 150 mm		Forward (30°)  Backward (50°) from Central vertical axis

European Standard For wheel Arch:

Note:

1. The Clearance “L” Shown in the figure at all five Section SA, SB, SC, SD & SE the value must be Greater then 10 mm
2. The distance “a” between Tire and fender must be greater than 5 mm

         

           Skin Data Provided for Wheel Arch Calculation

Image:

 

A. Obtaining the Value of “L” at different section

 

1. Section SA

     2. Section SB

     3. Section SC

      4. Section SD

        5. Section SE

Measured Value/Final Analysis

Section	Required Clearance (L)	Actual Clearance (L)	Clearance Needed	Result
SA	>10.0000 mm	9.9490 mm	0.051 mm	Fail
SB	>10.0000 mm	10.0000 mm	Nil	Pass
SC	>10.0000 mm	0.1139 mm	9.8861 mm	Fail
SD	>10.0000 mm	2.8875 mm	7.1125 mm	Fail
SC	>10.0000 mm	5.9973 mm	4.0027 mm	Fail

B. Obtaining the Distance between Fender & Tire “a”

Vertical Distance “a” b/w tire and fender is 32.3737 mm which is greater than 5 mm

C. Obtaining the wheel arch area of the given fender

1. Wheel Arch Area = 2452 mm
2. Arch Radius = 6048 mm

 

Conclusion: After the calculation of Clearance “L” & Distance “a” from the above wheel arch we can conclude the result that it will not qualified the European Standard for wheel arch area. So suggestion for the styling team to modify the surface of curvature of fender also modify the Clearance value “L” such that it can be greater than and equal to 10mm by increasing the curvature to outwards