Name : Pratik L Malusare

Enrollment No : 510

Dept. : Automobile Dept.

Topic : Wheel Balancing

PIET (DS) 2nd Shift

1

Wheel Balancing

What is wheel balancing?

• Wheel balancing is the operation performed in order to attain uniform traction and to avoid vibrations in automobiles by addition of balancing weights on the rim in order to distribute the wheel mass evenly during rotation.

When to balance a wheel:

• Vibration in the steering wheel at certain highway speeds.

• Vibration in the seat or floorboard at certain highway speeds.

• Scalloped or cupped wear pattern on the tires.

Scalloped tyre

DYNAMIC BALANCE*Dynamic balance describes the forces generated by

asymmetric mass distribution when the tire is rotated, usually at a high speed.

*In the tire factory the tire is mounted on a balancing machine test wheel, the assembly is accelerated up to a speed of 300 RPM or higher, and sensors measure the forces of unbalance as the tire rotates.

*Dynamic balance is better (it is more comprehensive) than static balance alone, because both couple and static forces are measured and corrected.

EFFECTS OF WHEEL MISBALANCING• When the tire rotates, asymmetric masses cause the

wheel to wobble, which can cause ride disturbances, usually vertical and lateral vibrations. It can also result in a wobbling of the steering.

• Wheels that are not balanced or are out of balance generally produce a vibration that is uncomfortable to drive in and results in premature wearing of suspension and steering components, rotating parts and tyres.

WHEEL BALANCING MACHINE

• A balancing machine is a measuring tool used for balancing rotating machine parts such as wheels, rotors for electric motors, fans, turbines, disc brakes, disc drives, propellers and pumps.

• The machine usually consists of two rigid pedestals, with suspension and bearings on top supporting a mounting platform.

Wheel Balancing Machine

PROCEDURE FOR BALANCING AN UNBALANCED WHEEL

• The tire is made free from all the small stones, if any .

• The wheel is fixed to spindle of wheel balancing machine by use of quick cone lock nut.

• Quick cone lock nut ensures fast mounting and fast removal of tire.

• Wheel balancing machine is switch on.• The spindle is made to rotate at speed of 400

rpm.• The rotation of the spindle is stopped.

• Wheel balancing machine determines the size of weights and where to locate weight on the wheel.

• The size of the weight and location of the weight to be placed is shown on the monitor of the wheel balancing machine.

• The weight is fixed to rim at exact location which is shown on the monitor.

• And wheel is removed from the spindle of wheel balancing by the use of quick cone lock nut.

• Now the wheel is balanced.• Now it can be used for comfortable driving.

Weight on rim

Material of balancing masses

• Previously lead is used as a material for manufacturing a weight. Because lead is toxic material so zinc is used for preparing weights.

Weights of Different size

Conclusion

• Wheels are balanced on a wheel balancing machine. The machine rotates the tire and wheel assembly and automatically calculates the weight and location of the balance counter weight. And require amount of weights are added to rim of wheel.

• It is observed that by balancing the wheel, the life of the tire will increases, hence there will not be any vibrations in steering or car and the drive will be smooth and comfortable.