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Wheel Balance Theory

Wheel Balance Theory. Balance - Unbalance What does it mean?. Balance.... by definition. The stability resulting from the equalization of opposing forces. Equal Force. Types of imbalance. Static Single Plane Dynamic Two Plane. What is Static Balance?.

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Wheel Balance Theory

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  1. Wheel Balance Theory • Balance - Unbalance • What does it mean?

  2. Balance....by definition The stability resulting from the equalization of opposing forces. Equal Force

  3. Types of imbalance... • Static • Single Plane • Dynamic • Two Plane

  4. 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

  5. How do you Static Balance this Wheel? Heavy Area Rotates to Bottom .25 oz Imbalance

  6. Is 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?

  8. The answer: yes, BUT... can you Prove it? At 20 mph .25 oz of imbalance generates .86 pounds of force .86 lbs .86 lbs

  9. At 70 mph the force is 10.53 pounds It's still in perfect balance! 10.53 lbs NOTE: Speed rated Tires Utilize a Nylon Over-lay to prevent tire distortion at high speeds. 10.53

  10. One common problem: • Improper use of equipment • Mounting Method • Clean Mounting Surface • Calibration • Careless Weight Placement

  11. Consider this... Most Computer Wheel Balancers Round off to the nearest .25 oz. 1 oz. Balance Weight 1.12 oz. Imbalance Is this a Problem?

  12. Is this “rounding off..” a Problem? On most cars, this slight imbalance would NOT be felt.

  13. BUT, some Customers...... Complain about a Vibration at one Speed! Why?

  14. ...vibration at one speed! is why a Vibration may occur at one particular Speed!

  15. Natural Frequency Mechanical Objects have there own Natural Frequency

  16. Tire & Wheel "Natural Frequency" 4 Revolutions = Frequency of 4 CPS/HZ

  17. Tire & Wheel Frequency Change with Speed Tire imbalance frequency increasing Vehicle Speed Increasing

  18. Suspension Natural Frequency Range from 10 - 15 Hz/CPS 14 Hz 12 Hz

  19. Beating - & - Phasing Suspension Frequency Tire & Wheel Frequency Sum of the two above

  20. The point at which it is felt... 15 10 5 0 10 20 30 40 50 60

  21. ...and, the complaint... "...but, I balanced the tires in the FINE/NON-ROUND-OFF mode and... ...it still vibrates at 55 M.P.H.

  22. What's the Problem? • Mounting Error • Are wheels centered by the center hole? • Hub-centric • Are wheels centered by the lug nuts... or... • Lug-centric Duplicate O.E.M. Mounting

  23. ...also, Consider this Are Tires and Wheels Perfectly Round? Tire High Spot Wheel High Spot Would this Mismatch cause a problem?

  24. 15 10 5 0 10 20 30 40 50 60

  25. Match Mounting Mis-Matched Matched

  26. Dynamic / 2-Plane

  27. Dynamic Imbalance 1 oz. Imbalance

  28. During one revolution

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