wheel arc calculation

Problem Statement: -

• Calculate the Wheel Arc Radius for the given Fender. Using the European Standards Discussed,
• Calculate the Wheel Arc area and prove whether the car will pass the standards or Not.

Theory: -

Fender Design: -

1. Primary purpose to avoid sand, mud rock, liquid and other particle to be thrown in air due to rotation of wheel.
2. Fender avoid motion of road particle to be thrown to pedestrian & to contain motion of these particles.
3. Front fender is Indi dually designed whereas rear fender is accommodated in body side structure.
4. It also avoids hitting inside engine compartment of road particle due to motion of wheel.
5. Fender skirts are used to enclose outside edge of wheel well.

• Fender are basically categorized as full bumper type and half bumper type.
• Full bumper type is not used nowadays since they require more blank size as compared to half bumper type which result in large scrap to be produced.
• In half bumper size with slight increase in bland size we can accommodate two fender in one bland which results in lesser scrap.
• In half bumper type we are also using plastic parts at front end which will also reduce weight and part.

For wheel arc calculation there are 3 standards

1.Japan standard: -

According to Japan standard the clearance value L should not be less than 5 mm at all 3 condition.

2.Europian Standard: -

The clearance L Should not be less than 10 mm at all five condition if it is so then styling engineer has to adjust the curvature

3.US Standard: -

In this clearance distance should not be less than 5 mm at angle of every 10 degree as specified in above fig. from -20 to 180 degree.

Procedure for European Regulation: -

• Take plane on face of wheel and create st line in vertical direction from center of wheel.name it as SA.
• Create line of angle 30degree and 50 degree in forward and back ward direction. And name them as SB and SC.
• Then create horizontal line passing through the center of wheel. And create offset of 150 mm in upward direction and identify the point of intersection with the edge of wheel.
• Draw an line passing through center of wheel and intersection point. Create angle bisector using bisecting line option available in lines name them as SD and SE.
• Exit the sketch use measure tool and measure distance between line and fender outer edge.

Conclusion: -

From above analysis

• For SB value clearance requirement is satisfied but for other condition clearance is less than standard value of 10 mm.
• Standard clearance value of 10 mm is not Satisfied.

Corrective Measure: -

• Style engineer has to change curvature of fender to satisfy European standard.