# US 7,610,808 B2 · Method for balancing motor vehicle wheels

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- Number: US 7,610,808 B2
- Document ID: US7610808B2
- Status: Granted
- Kind: B2
- Application number: 11/849,635
- Filed: 2007-09-04
- Published: 2008-03-13
- Granted: 2009-11-03
- Earliest claimed: 2006-09-11
- Assignees: Corghi S.p.A.
- Inventors: Remo Corghi
- Web page: https://patentgrep.com/patent/US7610808B2

## CPC

- G01M 1/225: {for vehicle wheels (in situ G01M1/28)}
- G01M 1/02: Details of balancing machines or devices
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## Abstract

A method for balancing motor vehicle wheels, comprising mounting the wheel onto the rotating spindle of a balancing machine, using a probe of known type, selecting balancing planes and diameters, providing the data to the balancing machine, spinning the wheel, calculating the value of imbalance, calculating an entity and angular position for balancing weights to be applied in the balancing planes and diameters previously selected by the operator; during the spinning of the wheel, measuring an acceleration time between two predetermined speeds of the wheel; calculating an imbalance threshold value and applying the balancing weight only if it is above the calculated threshold value.

## Claims

### Claim 1

A method for balancing motor vehicle wheels, comprising following operations:
mounting a wheel onto a rotating spindle of a balancing machine;
using a probe of known type for selecting balancing planes and diameters, and providing data relating to the planes and diameters to the balancing machine;
spinning the wheel;
calculating a value of imbalance W;
calculating an entity and angular position for balancing weights to be applied in the balancing planes and diameters previously selected by an operator;
characterised in that said method comprises following further activities;
a. during the spinning of the wheel, measuring an acceleration time TACC between two predetermined speeds of the wheel;
b. calculating an imbalance threshold value WB with the equation as follows:
WB=KS×TACC+S0
where
KS is a threshold constant expressed in grams per millisecond (g/ms)
S0 is a minimum threshold value expressed in grams (g)
TACC is an acceleration time expressed in milliseconds (ms)
c. applying a balancing weight only if said imbalance value is above the calculated threshold value.

### Claim 2 (depends on 1)

The method of claim 1, characterised in that the values of KS and S0 are determined experimentally.

### Claim 3 (depends on 1)

The method of claim 1, characterised in that calculations are made of at least one of the following threshold values: WBS of the balancing weight of static imbalance, WBM of the balancing weight of the dynamic imbalance and WBD of the balancing weight of the overall imbalance.

### Claim 4 (depends on 3)

The method of claim 3, characterised in that the machine calculates the threshold value WBD of the balancing weight for the overall imbalance, and if the overall imbalance WD measured by the machine is less than or equal to WBD (WD<=WBD), no weight is applied.

### Claim 5 (depends on 3)

The method of claim 3, characterised in that the machine calculates the threshold value WBD of the balancing weight of the overall imbalance, and when the overall imbalance WD measured by the machine is greater than WBD (WD>WBD), the machine subtracts WBD from WD for each balancing plane and calculates the values of WD1i=WDi−WBD, and WD1e=WDe−WBD and displays said values WD1i and WD1e on a screen of the machine.

### Claim 6 (depends on 3)

The method of claim 3, characterised in that the machine calculates the threshold values WBS and WBM of the balancing weight for the static and dynamic imbalances, and when the static imbalance WS measured by the machine is greater than WBS (WS>WBS); and the dynamic imbalance WM measured by the machine is greater than WBM (WM>WBM), the machine calculates WS1, WM1i and WM1e and calculates the resultants WDi and WDe that are the overall imbalances calculated in the two balancing planes, and displays said resultants WDi and WDe on a machine's screen.

### Claim 7 (depends on 3)

The method of claim 3, characterised in that the machine calculates the threshold values WBS and WBM of the balancing weight of the static and dynamic imbalances, and when the static imbalance WS measured by the machine is greater than WBS (WS>WBS) and the dynamic imbalance WM measured by the machine is less than or equal to WBM (WM<=WBM), the machine calculates WS1 whereby WS1 is the vectorial subtraction WS−WBS, and indicates the plane in which the weight must be applied in order to minimise WM, and displays the result on a machine's screen.

### Claim 8 (depends on 3)

The method of claim 3, characterised in that the machine calculates the threshold values WBS and WBM of the balancing weight for the static and dynamic imbalances, and when the static imbalance WS measured by the machine is less than or equal to WBS (WS<=WBS); and the dynamic imbalance WM measured by the machine is greater than WBM (WM>WBM), the machine calculates WM1i and WM1e whereby WM1i and WM1e are vectorial subtractions in the balancing planes of the internal and external wheel and displays the results on the screen.

### Claim 9 (depends on 3)

The method of claim 3, characterised in that the machine calculates the threshold values WBS and WBM of the balancing weight of the static and dynamic imbalances, and when the static imbalance WS measured by the machine is less than or equal to WBS (WS<=WBS) and the dynamic imbalance WM measured by the machine is less than or equal to WBM (WM<=WBM), the machine tells the operator not to apply any weight.