Presentation on theme: "Wheel Balance Theory Balance - Unbalance What does it mean?"— Presentation transcript:
1Wheel Balance TheoryBalance - UnbalanceWhat does it mean?
2Balance....by definition Equal Force The stability resulting from the equalization of opposing forces.Equal Force
3Types of imbalance...StaticSingle PlaneDynamicTwo Plane
4If rotated it rotates with Equal Force What is Static Balance?Static Balance is when the weight of the wheel and tire assembly is distributed equally around the axis of the wheel rotation.If static Balance exists the wheel will have no tendency to rotate.If rotated it rotates with Equal Force
5Heavy Area Rotates to Bottom How do you Static Balance this Wheel?Heavy Area Rotates to Bottom.25 oz Imbalance
6Is this wheel in static balance? .25 oz imbalance.25 oz weight added
7...and, if this wheel is in static balance? If this wheel is in perfect balance at a speed of 40 mph, will it remain in balance at all speeds?
8At 20 mph .25 oz of imbalance generates .86 pounds of force The answer: yes, BUT... can you Prove it?At 20 mph .25 oz of imbalance generates .86 pounds of force.86 lbs.86 lbs
9It's still in perfect balance! At 70 mph the force is poundsIt's still in perfect balance!10.53 lbsNOTE: Speed rated Tires Utilize a Nylon Over-lay to prevent tire distortion at high speeds.10.53
10Improper use of equipment One common problem:Improper use of equipmentMounting MethodClean Mounting SurfaceCalibrationCareless Weight Placement
11Consider this... Is this a Problem? Most Computer Wheel Balancers Round off to the nearest .25 oz.1 oz. Balance Weight1.12 oz. ImbalanceIs this a Problem?
12On most cars, this slight imbalance would NOT be felt. Is this “rounding off..” a Problem?On most cars, this slight imbalance would NOT be felt.
13Complain about a Vibration at one Speed! BUT, some Customers......Complain about a Vibration at one Speed!Why?
14is why a Vibration may occur at one particular Speed! ...vibration at one speed!is why a Vibration may occur at one particular Speed!
15Mechanical Objects have there own Natural Frequency
164 Revolutions = Frequency of 4 CPS/HZ Tire & Wheel "Natural Frequency"4 Revolutions = Frequency of 4 CPS/HZ
17Tire imbalance frequency increasing Vehicle Speed Increasing Tire & Wheel Frequency Change with SpeedTire imbalance frequency increasingVehicle Speed Increasing
18Suspension Natural Frequency Range from Hz/CPS14 Hz12 Hz
19Beating - & - Phasing Suspension Frequency Tire & Wheel Frequency Sum of the two above