Hofmann Werkstatt-technik Gmbh

Snap-on Equipment Gmbh

Snap-on Deustchland Holding Gmbh

Karl Rothamel

Lorenz Lenhardt

Eickhart Goebel

Ulrich Diez

Josef Drechsler

Wolfgang Rowe

Gottfried Kuhn

Kurt Humber

Klaus Ruhl

Jorg Wowes

Gottfried K&uuml;hn

Stefan Vollmari

Gerhard Rossteuscher

Walter Hollube

Burkhard Merg

Bernhard Hoffmann

Klaus Ruehl

Andreas Fuchs

In a method and apparatus for balancing a vehicle wheel, the wheel when fixed to a main shaft of a balancing machine, after the implementation of a wheel unbalance measuring run, is stopped at a given rotational angular position for a balancing operation to be carried out on the wheel, by braking of the rotary movement of the wheel. When the wheel is in the stopped condition, a braking moment derived from the unbalance measurement result and applied by a holding brake is caused to act on the wheel so that the wheel is prevented from rotating of its own accord by virtue of its static unbalance.

Method of and apparatus for balancing a vehicle wheel

In a method and apparatus for checking the uniformity of a pneumatic tire of a vehicle wheel, first and second unbalance measuring operations are performed to determine unbalance vectors of the vehicle wheel, which are ascertained at differing wheel speeds and/or with differing tire pressures and the difference is formed between the unbalance vectors for evaluation of the uniformity of the tire.

Method and apparatus for checking the uniformity of a pneumatic tire

In a method and an apparatus for centeredly clamping a motor vehicle wheel on a shaft of a wheel balancing machine the wheel is first clamped on a centering cone member mounted on the main shaft and then a post-centering operation is effected wherein the wheel is at least partially released, with the wheel being rotated with respect to its initial rotary angle position through about 180&#xb0;, and then the wheel is clamped on the shaft again.

Method and apparatus for centeredly clamping a motor vehicle wheel on a main shaft of a wheel balancing machine

Apparatus and method for measurement of any unbalance of a motorcycle wheel, having a rotatable main shaft of a wheel balancing machine having an electrical drive, a clamping shaft fixed coaxially with the main shaft and on which the motorcycle wheel is rotatably mounted on its bearings, a driver device which is connected in a non-rotational manner to the main shaft to transmit a torque, produced by the electrical drive, from the main shaft to the motorcycle wheel which is rotatably mounted on the clamping shaft, and a measurement device which, in one measurement run, measures forces from any imbalance of the motorcycle wheel at the measurement rotation speed, where the non-rotational connection between the driver device and the motorcycle wheel can be detached by means of an inertial force, which acts on the driver device and is formed by a torque impulse that is transmitted via the main shall.

Apparatus and method for measuring of any imbalance of a motorcycle wheel

A method and a device for moving a wheel rotatably mounted on a wheel balancing machine from a first position at which unbalance compensation has been performed, to a second unbalance compensation position for further unbalance compensation. According to the method, the rotor is externally driven, e.g., by hand, to freely running rotation, at which time, a drive motor is energized to generate a torque which acts counter to the direction of rotation of the wheel and to bring the wheel to a stop over a braking distance brought about by the counter torque which corresponds to the angle of rotation which is traveled over up to the unbalance compensation position, whereupon, the motor is de-energized. The apparatus includes a motor drive including an alternating voltage controller having a longitudinal switching device; and a commutation switching device, the switching devices each including two semiconductor switches which are connected in an anti-serial configuration.

Method and device for inserting a rotor, in particular a motor vehicle wheel, which is rotatably mounted on an unbalance machine and can be driven by means of an electric motor

A method and an apparatus for balancing a motor vehicle wheel, in which the torque during acceleration to the measurement rotation speed and during braking after carrying out the measurement run is adjusted as a function of the wheel type to be balanced, such that the rotationally fixed connection between the main shaft and the motor vehicle wheel is maintained even when the driving prestressing force between the main shaft and the motor vehicle wheel is reduced.

Method and apparatus for balancing a motor vehicle wheel

The invention relates to a device for measuring a rotor imbalance. Said device comprises a main shaft which is rotatably mounted in a machine housing and to which the rotor to be measured is fixed, a single-phase alternating-current motor for driving the main shaft, with a single-phase winding ( ) and an auxiliary winding ( ) which is offset in phase for driving the main shaft ( ) up to measurement speed and a control device ( ) that adjusts the current of the motor. Said control device ( ) has an assembly ( ) which reduces the supply current delivered to the two windings ( ) of the motor ( ) once the measurement speed has been reached, in such a way that the motor creates a reduced torque which substantially compensates a speed drop produced by friction and drag.

Device for measuring rotor imbalance

In a method and an apparatus for balancing a motor vehicle wheel comprising a pneumatic tire and a disk wheel, the wheel is clamped on a measuring spindle and geometrical data of the wheel are sensed and stored. Wheel unbalance is ascertained in at least one measuring run and at least one balancing vector for balancing mass and balancing position is calculated in accordance with a balancing program selected in dependence on the disk wheel type and material, in at least one balancing plane. At least one balancing weight is fixed to the wheel in dependence on the balancing vector. When sensing a rim region of the wheel a sensor detects whether a rim portion extending substantially perpendicularly to the measuring spindle is or is not present in the rim region being sensed and the balancing program is selected in dependence on the signal obtained in the sensing operation with the sensor. A sensing apparatus includes a sensing member for sensing geometrical data of the wheel and a sensor for sensing a suitable rim configuration for applying a balancing weight thereto and/or the wheel material.

Method and apparatus for balancing a vehicle wheel

A rotary angle sensor for a rotary member such as a motor vehicle wheel comprises an emitter, and a plurality of reflectors arranged in the form of flat surfaces on a circular-cylindrical surface of the rotary member or of a rotational portion which in operation rotates with the rotary member, light emitted by the emitter being reflected by the reflectors and received by a detector. The detector produces corresponding signals which are evaluated in an evaluation arrangement for detection of the rotational angle involved.

Rotary angle sensor for a rotary member

A motor vehicle wheel balancing machine holds a motor vehicle wheel by clamping it on a balancing machine measuring spindle. After an operation to measure the unbalance of the the wheel has been preformed, a balancing weight is attached to the wheel using a sensor, and the measuring spindle is stopped with a holding brake which is activated when the sensor is activated.

Method and apparatus for holding in position a motor vehicle wheel

A method of stopping an electric motor-driven balancing machine main shaft after an unbalance measuring run in a specific rotary angle stoppage position corresponding to a desired balancing rotary angle position provides that in the course of retardation of the main shaft, a timer is switched on at a short angular spacing of for example 3.degree. before the main shaft reaches the desired rotary angle stoppage position. The timer predetermines a time interval which is determined from the rotary speed and the rotary angle position of the main shaft at the time of the timer being switched on, with the retardation operation being stopped at the end of that time interval, with the main shaft stationary. The retardation operation can be effected by torque reversal of the motor.

Method of stopping an electric motor-driven balancing machine main shaft

In a method of rotating a rotary member on a balancing machine into balancing positions in first and second balancing planes, after the unbalance measuring run the rotary member is braked and thus rotated into the balancing position in the first balancing plane, with the braking deceleration being measured. The rotary member is then accelerated to a rotary speed of at most 80 rpm for rotation into the balancing position in the second balancing plane. The rotary member is then braked so that the braking travel resulting from the measured deceleration corresponds to the differential angle still remaining as far as the balancing position in the second balancing plane.

Method of rotating a rotary member in a balancing machine into balancing

A wheel balancing machine that includes a lighting device to illuminate the inside of the wheel or rim bowl facing the wheel balancing machine. Illumination preferably occurs in an area above the shaft on which the wheel is mounted and improves the task of correctly positioning and attaching balancing weights.

Wheel balancing machine

An unbalance measuring machine has an arrangement for clamping and release a motor vehicle wheel or other rotary member on a motor-driven shaft. The machine has a bar which is guided movably in the shaft in its axial direction. The bar is engaged at one end with the rotary member and at the other end with a belt pulley via interengaged screw threads. When the belt pulley is driven by the drive motor in one direction of rotation, the bar axially clamps the rotary member on the shaft to hold it fast. When the belt pulley is driven by the drive motor in the other direction, the bar moves in the opposite direction to release the rotary member.

Method and assembly for clamping and releasing a rotary member on a

A method and device for balancing an unbalance on a motor vehicle wheel, including a tire mounting portion that is provided with a stylized design. Such a wheel can include a supporting disk with openings therein defining radially extending, spaced apart support members, such as struts or spokes, in the main area of the wheel. In particular such a tire supporting disk can comprise light metal. The angular positions of the radially extending support members are determined and are stored in storage 2 and the measurement values determined in the measurement procedure are divided into balancing corresponding to the angular positions of the radially extending support members. Weights for balancing the wheel are determined and are attached to the supporting disk at angular positions corresponding to the locations of the support members.

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Ober-Ramstadt, Germany

Karl Rothamel