Fender Design - Wheel Arch Challenge

Wheel Arch gap - Calculations

Aim :

To calculate the wheel arch gap at required points and check whether the car passes the European standard.

Objective :

• Study about the different wheel arch gap standards.
• Draw the lines at the required angle and points for the European standard.
• Measure the distance at each angles and mention given model is pass or fail.

THEOROTICAL EXPLANATION :-1) WHAT IS FENDER :- Fender is a part of an automobile, motorcycle or other vehicle body that frames a wheel well (the fender underside). Its primary purpose is to prevent sand, mud, rocks, liquids and other road spray from being thrown into the air by the rotating tire. Fenders are typically rigid and can be damaged by contact with the road surface.

The main purpose of fenders on cars is that they shield the wheels and they protect the passenger the pedestrains and the other vehicles from stones, mud, liquid and other debris that can fly in the air because of the speeding rotating wheels while the car is running.

2) WHAT IS WHEEL ARCH:- It is a curved part of the fender positioned right above the wheel. The wheel Arch is designed such that it protects both the pedestrian and car cabin from mud, water rocks and other road spray. Different countries have different wheel arch regulations in place, and the wheel arch design has to comply with them to be deemed usable in that country

THE WHEEL ARCH REGULATION STANDARDS:­-1)JAPAN REGULATION 2)EUROPEON REGULATIONS 3)U.S.REGULATION JAPAN REGULATION:- 1)The clearance "L" for tire, hub, cap and fender is to be measured within area K and create clearance check chart to validate.

2)The value of L should be greater than 5mm at all positions.

3)Wheel guard requirement : The value of "a" should be more than 5mm at line 30degree forward and 50degree rearwards from the central vertical axis of the wheel EUROPEON REGULATION :-

1)The clearance "L" should be measured at sections SA-SA, SB-SB, SC-SC, SD-SD and SE-SE and create clearance check chart to validate.

2)At all the five sections the value of L should be greater than 10mm to satisfy the European Regulations.

3)Wheel guard requirement : The value of "a" should be more than 5mm at line 30degree forward and 50degree rearwards from the central vertical axis of the wheel.

U.S.REGULATION

1)Clearance "L" is to be checked at all positions from -100degree to 100degree and create clearance check chart to validate.

2)The value of L should be greater than 5mm to satisfy the regulations.

3)Wheel guard requirement : The value of "a" should be more than 5mm at line 30degree forward and 50degree rearwards from the central vertical axis of the wheel.

THE CALCULATION OF WHEEL AS PER EUROPEON REGULATION

*For calculation of clearance between wheel Arch and wheel we have to create a sketch on the outer most face of the wheel and the procedure as follows. 1)CREATE A SKETCH ON DATUM PLANE BY EXTRACTING THE OUTER SIDE FACE OF THE WHEEL 2)AFTER CREATING THE PLANE WE MAKE A SKETCH AND SKETCH THE LINES AND GIVING THE DIMENSIONS AND ANGLE AS PER EUROPEON STANDARD. 3)Then we need to measure the distance from the outer most wheel to the outer most wheel arch for that we add the some ponits on the face and the angle line By using the intersection points for the measurment.

4)from the SB line the clearence distance we measure is 43.64mm and the 50degree SC line the clearance distance is 38.36mm as shown in figure.

AS PER EUROPEONN STANDARD CALCULATIONS:-SA-SA,SB-SB,SC-SC,SD-SD,SE-SE IT SHOULD BE GREATER THAN OR EQUAL TO 10MM OBTAINING THE CLEARANCE VALUE" L"AS REQUIRED SECTIONS :-THE VALUE OF "L"IS CALCULATED AT REQUIRED SECTIONS ACCORDING TO EUROPEONN STANDARD AS SA-SA,SB-SB,SC-SC,SD-SD,SE-SEIT SHOULD BE GREATER THAN 10MM OR EQUALS TO 10 MM. " L"VALUE CALCULATIONS:-SB-SB=10MM SC-SC=0.114MM SD-SD=-2.88MM SE-SE=-5.99MM SA-SA=-9.94MM MEASURING THE CLEARANCE VALUE "A"FOR WHEEL GUARD :-THE VALUE OF "A"IS SHOULD BE GREATER THAN 5MM AT A LINE OF 30 DEGREE FORWORD AND 50 DEGREE BACKWORD.LINE FROM THE CENTRAL VERTICAL AXIS OF THE WHEEL. A"VALUE CALCULATIONS:- i)CLEARANCE VALUE "A"AT 30 DEGREE LINE (SB) =43.64MM ii)CLEARANCE VALUE "A"AT 50 DEGREE LINE(SC)=38.36MM THE RESULTS ARE TABULATED AS FOLLOWS:-

1)THE RESULT OF "L"VALUE CLEARANCE -

SECTION	L>10MM	RESULT
SA-SA	9.94MM	FAIL
SB-SB	10MM	PASS
SC-SC	0.11MM	FAIL
SD-SD	-2.88MM	FAIL
SE-SE	-5.99MM	FAIL

2)THE RESULT OF "A"VALUE CLEARANCE -

SECTION	A>5MM	RESULT
SA-SA	-	-
SB-SB	43.64MM	PASS
SC-SC	38.36MM	PASS
SD-SD	-	-
SE-SE	-	-

THE GIVEN RESULT IS PROVED THAT THE FENDER DOES NOT PASS AS PER EUROPEON REGULATION BEACAUSE THE CLEARANCE VALUE OF FENDER ARCH WHEEL AND OUTERMOST WHEEL IS 10MM.AND THIS DESIGN DOES NOT MEET THIS MINIMUM CLEARANCE VALUE .SO THE DESIGN OF THE FENDER IS FAIL AS PER EUROPEAN STANDARD.