System for speed-controlled balancing the wheel of a motor vehic

Details System for speed-controlled balancing the wheel of a motor vehic System for speed-controlled balancing the wheel of a motor vehic

1996-06-10

1998-04-14

Oen, William L.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

73462, G01M 106

Patent

active

057394288

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a balancing machine for balancing a wheel, in particular a motor vehicle wheel, wherein the wheel to be balanced is rotatably mounted on a shaft. The shaft is coupled with a sensor which detects the unbalance forces during turning of the wheel. The sensor is connected with a computer which determines the unbalance data from the output signals of the sensor in conjunction with the wheel-specific data.
2. Description of the Prior Art
A disadvantage of conventional balancing machines is that the balancing run always takes place in the same way and cannot be adapted to different requirements as, for example, high balance quality or short duration of measurement.
The disadvantage of conventional devices is the optimization of operation in accordance with the particular requirements, specifically balance quality and duration of measurement.


SUMMARY OF THE INVENTION

This above-described problem is solved with an apparatus that incorporates a drive device rotating the wheel for measuring the imbalance, and a speed control device for controlling the speed of the drive device. The speed control device includes a controllable frequency converter and a computer.
Advantageous embodiments include the features of a number of drive devices and a switch-over device being controllable by the computer for alternatively connecting the drive devices with the speed control device, with the drive devices being controllable by the computer with respect to the speed control devices. In addition, a drive device for opening and closing a wheel protection bow by the motor in accordance with the position of the wheel protection bow is used, wherein the drive device is controllable by the speed control device. Other features include a drive device for driving a device for determining the wheel-specific data, the drive device being controllable by the speed control device; a drive device for driving a device for mounting balancing weights on the wheel that is controllable by the speed control device; the speed control device being adapted to increase or reduce the speed slowly; the speed control device being adapted to control the speed in accordance with a selected balance quality; and the speed control device having a device for monitoring the current consumption in the drive devices so that an emergency shutdown of the drive devices takes place when a maximum admissible current consumption is exceeded.
According to the invention, the wheel can be driven at different speeds for the balancing run. This makes it possible to optimize the balancing run, for example, for a short duration of the balancing process or a high balance quality with high measuring precision. If the duration of the balancing process is to be kept short, the shaft can be driven according to the present invention at low speeds, which involves short run-up times and braking times. If the balance quality is most important, however, high speeds of the wheel are necessary for obtaining a high output signal from the unbalance sensor.
In a preferred embodiment, the speed control is performed with the help of a frequency converter.
With regard to the duration of the balancing run, the invention further allows in an advantageous embodiment for the wheel to be turned automatically (by motor) into the balancing position at the end of the balancing run and held there for mounting the balancing weights. It is thus unnecessary to turn in the wheel manually as is done in conventional systems.
The computer-controlled speed control device can also be applied advantageously to other drive motors in the balancing machine, for example for motor-driven opening and closing of a wheel protection bow or a motor-driven device for determining the wheel-specific data and/or mounting balancing weights.
In the preferred embodiment, the computer further monitors the current consumption of the motor or motors and switches them off if necessary.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The invention wil

REFERENCES:
patent: 3910121 (1975-10-01), Churchod et al.
patent: 4014139 (1977-03-01), Shooter et al.
patent: 4046017 (1977-09-01), Hill

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