WO2019178629A1

WO2019178629A1 - Device and method for wheel position detection

Info

Publication number: WO2019178629A1
Application number: PCT/AT2019/060095
Authority: WO
Inventors: Raimund Parzmair
Original assignee: Alpine Metal Tech Gmbh
Priority date: 2018-03-22
Filing date: 2019-03-20
Publication date: 2019-09-26
Also published as: AT520715A4; AT520715B1; DE112019001455A5

Abstract

The invention relates to a measuring device (1) and to a method, and furthermore to a clamping unit (2) for measuring an offset (10) of an axis of rotation (32) and/or the position of a motor vehicle wheel (3) clamped in a clamping unit (2) for machining, comprising a measuring means receptacle (4) having a height-adjustable measuring head (5), wherein the measuring head (5) is coupled with an actuator (11) having a actuator longitudinal axis (12), and is configured to be movable by means of the actuator (11) in the direction of the longitudinal axis of the actuator (12) between a measuring position (8) and an idle position (9), and at least one measuring means (6) for measuring the offset (10) of the axis of rotation (32) of the motor vehicle wheel (3) with reference to position coordinates of a central hole (31) in transverse direction (13) and/or axial direction (14) of the center hole (31) of the motor vehicle wheel (3) relative to the longitudinal axis of the actuator (12). The at least one measuring means (6) is designed in such a way that no relative rotation of the motor vehicle wheel (3) to the measuring head (5) is required for the measurement. The at least one measuring means (6) for measuring the offset (10) of the axis of rotation (32) and/or the position of the motor vehicle wheel (3) in transverse direction (13) and/or axial direction (14) is configured to either detect the position coordinates of the center hole (31) as relative distance (16) between the measuring head (5) and the center hole (31) of the motor vehicle wheel (3) to be measured, or is configured to detect the position coordinates of the center hole (31) as a relative position (17) of the measuring head (5) in the measuring position (8) deviating from the position of the measuring head (5) in the idle position (9).

Description

The invention relates to a measuring device and a method for measuring a displacement of a rotation axis and / or the position of a vehicle wheel tensioned for machining in a mounting unit, as well as a mounting unit comprising such a measuring device.

The manufacture of motor-vehicle wheels, which in the context of this application refers to wheels for cars and trucks, requires a number of manufacturing steps. After the prototypes of the vehicle wheel, such as by casting, mechanical, material-removing processes such as milling, grinding and in particular special drilling are usually applied. In this case, known to those skilled mechanical machining centers, such as CNC-controlled, multi-axis measuring and Zerspanvorrichtungen used. The processing time and accuracy should be as short as possible from a cost point of view. Automotive wheels require sufficiently accurately arranged and aligned contact surfaces in relation to a wheel suspension, as well as bolt holes positioned exactly to the center hole in order to ensure problem-free assembly. Just a few hundredths to a few tenths of a millimeter offset the bolt holes relative to the center hole can affect the assembly or even make it completely impossible.

In the context of today's zero defect policy in the automotive industry are therefore before the machining of the vehicle wheel or the rim, often perform an accurate measurement of the actual contours and Po positions of the vehicle wheel to control the processing center or a plant control device, the survey data of the motor vehicle Rades in the initial state to communicate. Frequently, an accurate measurement of the center hole of the vehicle wheel is performed and the center hole position or the position of the axis of rotation of the vehicle wheel used as a reference point and reference for the arrangement of the bolt holes and / or the window between the Fel genstegen.

This vehicle wheel measurement often takes place outside the actual machining center in its own measuring station. The survey data of the measured vehicle wheel are transferred to the plant control device before the vehicle wheel from the measuring device in the machining center is transferred. This procedure is very time-consuming and requires repeated clamping and unclamping of the vehicle wheel to be machined, with the resulting measuring tolerances, as well as a repeated determination of the position of the reference point as center of reference. This leads to loss of time in the processing of KfzRa and is therefore costly and therefore undesirable.

A number of surveying devices are known to the person skilled in the art for the measurement of already finished motor vehicle wheels for controlling the tolerances and / or adapting the current production for follow-on parts. By way of example, DE3836540A1 discloses a multi-point measuring device for measuring motor vehicle wheels. In this case, a plurality of transducers are arranged around a central measuring station in order to measure the external contours of a motor vehicle wheel. The central measuring station is designed to measure the center hole and the inner and outer Radanlageflächen during a complete Rota tion about the central axis of the central measuring station. The central measuring station has a bottom by the center hole of the wheel rim enclosing vertically displaceable Chen chuck, which can detect the center hole diameter by clamping an expanding mandrel. In this way, the multi-position measuring device disclosed in DE3836540A1 achieves a measuring time of several minutes by means of many different measuring sensors and makes it necessary to precisely set up the machined vehicle wheel in the measuring station. Such a measuring station is not suitable due to the time-consuming off and reclamping of the vehicle wheel to be measured already before processing a Po sition of an offset and / or a possible positional deviation of the vehicle wheel on serving for the processing of the vehicle wheel Determine clamping unit.

Similarly, DE102005017991 A1 describes a method and a device for measuring a machined vehicle wheel. The vehicle wheel to be measured must be braced with its inside resting on a turntable and with a counterholder from the outside. The measurement of the fixed in the rotating and clamping unit Kf-Ra of the bore by means of a first measuring unit for determining the eccentricity of the center hole, and by means of a second measuring unit for determining the flatness on the inner side of the wheel. The two measuring units correspond to relatively simple running mechanical scanning devices which are arranged in a measuring unit receptacle. To measure the eccentricity and / or the flatness is a complete rotation of the wheel around the axis of rotation of the turntable in clamped state required. However, the measuring device in DE102005017991A1 is also provided for measuring the finished motor vehicle wheel. The method is therefore not suitable for a measurement of, immediately before the subsequent mechanical processing of the vehicle wheel, in particular the bolt holes, already clamped on the Aufspanneinheit vehicle wheel, since the anvil and the turntable access a tool during processing from the inside and prevent the outside. Another, time-consuming manipulation step of the vehicle wheel from the measuring station, with subsequent re-establishment of the vehicle wheel in the Aufspanneinheit the machining processing center would therefore be required.

One way the measurement and detection of the center hole of a vehicle wheel directly in the machining center is known in the art, since modern machining centers can have eg a tool change magazine, which has a dedicated measuring head with a probe or eg a separate measuring device for measuring the position of the vehicle Wheels can be provided within the machining center. In this case, as a rule, the measurement of the position of the vehicle wheel on the basis of the center hole from above, ie from the opposite side of the Aufspanneinheit, leads to the vehicle wheel Runaway. The measurement within the machining center takes place shortly before the mechanical processing African and therefore directly at the expense of relatively expensive processing time, which can result in increased costs. In addition, such methods require a rotational movement of the vehicle wheel relative to the measuring device or vice versa, which means an additional design effort and thus costs. The measurement of the center hole for He mediation of the axis of rotation of the vehicle wheel as a reference point for the arrangement of the bolt hole drilling requires about 10 to 20 seconds per vehicle wheel or rim, which is about 15 to 20% of the machining time for drilling the bolt holes equivalent. A reduction of this measuring time, which must be calculated at the processing time, would be advantageous here. The axis of rotation of the vehicle wheel should ideally have no deviation, ie an offset in the transverse direction or X / Y direction, relative to the central axis of the clamping unit. Likewise, no deviation in the vertical direction, so a positional deviation of the center hole and thus of the vehicle wheel in the direction of the Aktorlängsachse or Z-direction should occur from a predefined clamping position of the vehicle wheel. Furthermore, the vehicle wheel should have no tilting of the axis of rotation relative to the actuator longitudinal axis or central axis of the clamping unit. A detection of an undesirable positional deviation of the vehicle wheel to a tilt angle relative to the plane of the Aufspanneinheit is nowadays not, or only with great effort, measurable. Such a tilting can lead, for example, in a slightly obliquely clamped motor vehicle wheel, that the axis of rotation of the motor vehicle wheel is inclined relative to the axis of the processing device and the bolt holes are drilled in an undesirable inclined position.

The object of the present invention was to overcome the above-mentioned disadvantages of the prior art and to provide an apparatus and a method by means of which a user is able to easily and inexpensively detect and measure an offset of the axis of rotation and / or the position, in particular a mögli Chen tilting, a tensioned for processing in a Aufspanneinheit car wheel before the subsequent processing to make.

This object is achieved by an apparatus and a method according to the claims.

The measuring device according to the invention for measuring an offset of a rotation axis and / or the position of a tensioned for processing in a clamping unit Kf-Ra, comprising a measuring means recording with an actuator, and at least one coupled to the actuator measuring means with a measuring head. The measuring head is designed to be adjustable in height and coupled to the, having a Aktorlängsachse, actuator. The measuring head is designed to be movable in the direction of the actuator longitudinal axis between a measuring position and a rest position. The at least one measuring means is adapted to the Vermes solution of the offset of the rotational axis of the vehicle wheel based on position coordinates of the center hole of the vehicle wheel in at least the transverse direction and / or the position or position of the center hole in the axial direction of the vehicle wheel relative to Aktorlängsachse to determine. The at least one measuring means is designed such that no relative rotation of the vehicle wheel to the measuring head and / or the clamping unit is required for the measurement. The at least one measuring means is further adapted to measure the offset of the Rota tion axis and / or the position of the vehicle wheel on the basis of the center hole in the transverse direction and / or the axial direction either the position coordinates of the center hole as a relative distance between rule measuring head and the center hole to detect to be measured vehicle wheel, or to detect the posi onskoordinaten the center hole as a relative position of the measuring head in the measuring position deviating from the position of the measuring head in the rest position. The deviations of a few hundredths to tenths of a millimeter of the axis of rotation from the central axis of the clamping unit, which often occur in practice due to the clamping of the vehicle wheel, can advantageously be achieved with the measuring device according to the invention in the already clamped state of the motor vehicle wheel for subsequent processing used clamping unit can be detected. The actuator longitudinal axis coincides in the inventive measuring device with the central axis of the clamping unit. This can be ensured relatively easily if the measuring device is retrofitted into an existing wheel bridge or clamping unit, for example. The measurement of an unwanted desired offset of the axis of rotation of the vehicle wheel relative to the actuator longitudinal axis of the measuring device and / or an undesirable vertical deviation and / or unwanted desired tilting of the vehicle wheel can hereby be determined in a relatively simple manner who the.

In this case, a measuring means is used for determining or measuring the position coordinates of the center hole. The survey data are made available to a system controller which uses the survey data as correction quantities for the subsequent machining, in particular the drilling of the bolt holes, with unchanged clamping of the vehicle wheel. This means that a displacement of the axis of rotation in the transverse direction is detected and an associated correction of the pinhole positions takes place. This saves an orderly training and re-tensioning of the vehicle wheel. Due to the arrangement of Messmit means at least partially on or within the height-adjustable measuring head, the measuring device can be arranged on the side which faces away from the machining side when drilling the bolt holes. Modern machining centers have two or more on clamping units, which can be changed into the processing area. Due to the already carried on or clamping of the vehicle wheel on the Aufspanneinheit the measurement outside or within the machining center is possible and can therefore advantageously even outside of the processing room in a non-productive time, so while the machining center processed another car wheel done , In this way, can be dispensed with the measurement within the processing area and expensive Be processing time can be saved. Furthermore, a detection of a possible tilting or misalignment of the vehicle wheel in the clamping is possible and can optionally be corrected before the clamping unit is changed into the processing area. It is However, it is also conceivable that when using a multi-axis machining center, the surveying data or correction variables are used to align the processing tool, such as a drill, for the offset determined in the transverse direction and / or tilting of the vehicle wheel. A new or re-tensioning can be avoided in this way.

The device according to the invention has for measuring the offset of the axis of rotation and / or the position, ie tilting, of the motor vehicle wheel to a measuring means, the posi tion coordinates of the center hole in the room, with the measuring device in the home position as Be zugssystem determine. According to the inventive idea, the measuring means can be determined here as the relative distance at at least two, preferably three, points between the measuring head and the center hole at the level of the center hole and thus the rotational axis of the vehicle wheel can be determined. For a known center hole diameter, only two relative distances to be detected are required for this purpose, whereby a measurement at three points can preferably be made to increase the measurement accuracy. It is also possible to determine the posi onskoordinaten the center hole by the deflection of the measuring head in the measuring position when contacting the measuring head with the center hole, and to determine the axis of rotation of the vehicle wheel relative to the Aktorlängsachse by recalculating the assumed relative position relative to the rest position of the measuring head , In both cases, can be dispensed with a Dre hung the measuring device relative to the vehicle wheel, or vice versa, creating a very robust and relatively simple and inexpensive construction is made possible.

Furthermore, it may be useful if the measuring head for measuring the Relativab between the measuring head and the vehicle wheel to be measured has a smaller diameter than the center hole of the vehicle wheel and thus the measuring head is formed in the measuring position inserted into the center hole, wherein the at least one measuring means comprises at least two, preferably three, radially and star-shaped sensor elements for measuring the posi tion coordinates of the center hole as a respective relative distance of the respective sensor element from the center hole.

The advantage of this embodiment is the possibility of differently sized motor vehicle wheels with correspondingly different central hole diameters by insertion of the measuring head to be able to measure in the middle hole. By using only two sensor elements, the distance to the central hole can be determined in a very simple manner and thus the exact position of the axis of rotation of the vehicle wheel relative to the actuator longitudinal axis or central axis of the clamping unit can be determined. The use of three or more sensor elements can increase the accuracy of measurement. It is also conceivable that the measuring means or the sensor elements of this arrangement detect in a kind of "scanning movement" when taking the measuring position the beginning of the center hole in the vertical direction or the Aktorlängsachse, whereby a detection of the position of the vehicle wheel in space made light and a possible tilting can be deduced if the at least two, preferably three, measuring points or starting points of the center hole are detected at unterschiedli chen time points during the movement.

Furthermore, it can be provided that the sensor elements are designed as contactless distance sensors or radially movable touch probes.

The inventive design of the sensor elements allows a sichtver from the outside and in some circumstances even before and after the measurement process, e.g. by a ver slidable diaphragm, protected arrangement of the at least one measuring means. The non-contact measurement has the advantage that no physical contact to the center hole must be made, whereby a consistent and wear-free measuring device is guaranteed. The training as a movable or in the radial direction of the probe temporarily extendable bare probe represents a very cost and robust variant of the Messvorrich device is.

In addition, it can be provided that the actuator has a support for a bearing on a center hole in the radially outwardly adjacent contact surface of the vehicle wheel suitable and opposite the measuring head in the radial direction projecting support surface.

The formation of a support surface has the advantage that a detection of the vertical position or deviation of the vehicle wheel can be done by contacting the support surface when taking men the measuring position. In addition, the support surface may be advantageous for supporting by applying a damping force during drilling of the bolt holes. In particular, with very thin-walled or filigree constructed motorcycles can thus a Stiffening during drilling efficiently reduce unwanted distortion and / or deflection, which can ensure the quality of the produced motor vehicle wheels.

Also advantageous is an embodiment according to which it can be provided that the measuring head has a convex shape in the axial direction and a maximum diameter greater relative to the center hole, and is displaceably mounted in the transverse direction and / or axial direction relative to the actuator longitudinal axis, and wherein the at least one measuring means for measuring the position coordinates of the center hole on the basis of the relative position of the measuring head in the measuring position, is formed such that in the measuring position, a deflection of the measuring head in the transverse direction and / or axial direction relative to the rest position can be detected.

Such a measuring head designed for measuring the position coordinates of the central hole offers the advantage that the measuring means can be arranged in the rest and measuring position from the outside, so that a particularly robust construction becomes possible. Furthermore, by means of the convex, preferably cone-shaped or also spherical segment-shaped form of the measuring head, a kind of self-centering of the measuring head in the measuring position can take place. This embodiment thus allows a "floating" storage of the measuring head, whereby the degrees of freedom and arrangement options of at least one measuring means are significantly increased he. Depending on the arrangement of the measuring means, the displacement of the measuring head relative to the longitudinal axis of the actuator can be determined very accurately in at least the transverse direction, but also under the circumstances, at the same time in the vertical direction. In this way, the determination of an offset in the transverse direction and / or vertical direction, and u.U. even at the same time a tilting of the motor vehicle wheel accessible. This can reduce the time required to measure and increase safety and quality during processing.

According to a development, it is possible for the at least one measuring device to comprise at least one optical and / or inductive and / or one capacitive sensor element.

The use of optical and / or inductive and / or capacitive sensor elements can preferably take place within the measuring head, but also separately or at least partially on or within the actuator. The sensor elements are efficiently protected from the outside Depending on the type of sensor used, it is possible for example to detect a shift in at least one spatial direction based on reference markings. The use of capacitive sensor elements has proved to be particularly advantageous because they allow a small size, low energy consumption and good measuring sensitivity. It can be provided that the measuring head comprises at least two, preferably three, corresponding sensor elements in order to be able to detect displacements in the transverse direction and / or axial direction. It is also conceivable that the sensor elements are arranged obliquely to Aktorlängsachse such that they are able to detect the displacement of the measuring head simultaneously in the transverse and Ver tikalrichtung or Aktorlängsrichtung. This allows a robust, low-maintenance and rapid detection of the position coordinates of the center hole and / or the position of the vehicle wheel.

Furthermore, it may be expedient if, for the simultaneous measurement of the relative position of the measuring head in the transverse direction and axial direction of the measuring head to a disposed within the Ak sector, designed as a bending rod measuring means, is mounted.

In this way, the sensor elements can be arranged within the measuring head and / or within the actuator, and a floating mounting of the measuring head can be realized in a simple way. The deflection of the bending bar in a direction of the Sensorele elements detected spatial directions gives an indication of the position of the axis of rotation of the center hole and can even be used to determine the position or tilt of the vehicle wheel in a relatively simple manner. It is even conceivable that such a bending rod can be used to determine a force to be applied to the vehicle wheel from below damping force.

In addition, it can be provided that the at least one measuring means is disposed within the measuring head from the outside at least temporarily hidden from view.

The temporary concealment of the measuring means can increase the duration of use and thus the maintenance intervals of the measuring device. It can thus be ensured a high precision of the measurement over a longer period. Furthermore, the risk of damage to the measuring means, for example, during tightening or removal of the vehicle wheel on the clamping means is reduced. Furthermore, it can be provided that the measuring means comprises a wireless, preferably WLAN or Bluetooth, communication device for transmitting the position coordinates of the center hole as surveying data to a plant control device.

It has proven to be particularly advantageous if the measuring means can be connected wirelessly with a system controller, since in this way no openings in the measuring head and / or the actuator are required, in which foreign bodies can accumulate. This promotes the robustness of the measuring device. Moreover, such a measuring device can also be installed with relatively little technical outlay into already existing clamping units and connected to the system control via wire-free data transmission methods which are well known to those skilled in the art.

According to a particular embodiment, it is possible for the measuring means to have an energy supply device, which is preferably rechargeable in the rest position, preferably by means of inductive and / or capacitive energy conductors penetrating the actuator and / or the measuring head.

In this way, the self-sufficient functionality of the measuring means with respect to the Aufspannein unit can be ensured in a simple manner. The wireless power transmission allows, especially in the field of height-adjustable actuator, unwanted power and / or data transmission cables can be recessed, creating a very robust design is possible.

According to an advantageous development, it can be provided that a charging device corresponding to the energy supply device is arranged on the measuring device receptacle.

By this arrangement, the distance to the power supply device, which is preferably arranged in the measuring head, be kept relatively short. This favors the avoidance of transmission and power losses and allows a fast and safe charging of the power supply device in the rest position of the measuring head. In particular, it may be advantageous if an additional length measuring element, preferably a length measuring rod, for measuring a vertical displacement of the actuator is coupled to the actuator.

This length measuring element can be used as a redundancy element for detecting the vertical position of the measuring head or else as a supplement to a measuring device which only detects in the transverse direction. Such a length measuring element can thus be used in combination or as part of a previously mentioned measuring means, which is designed to detect an offset in the transverse direction, or also be used independently as a measuring means for the sole determination of the position as thus independent measuring device. According to the inventive idea, such a measuring device for determining the position or vertical displacement is not necessarily limited to an arrangement in the measuring head, but may optionally also be arranged on or at least partially within the measuring device receptacle and / or the actuator. Such a length measuring element may be formed as at least one capacitive, inductive and / or optical sensor element and serves to detect the deflection of the actuator and / or the measuring head in the vertical direction. Preferably, the length measuring element may be formed as a length measuring rod mechanically and / or electromechanically and, for example, be coupled with the actuator. This embodiment can also be designed independently in the context of the present invention and therefore represents an optionally independent invention for controlling the position of the motor vehicle wheel and / or the tilting of the motor vehicle wheel.

Furthermore, it can be provided that the actuator comprises a pneumatic, hydraulic or electro-mechanical drive for applying a damping force on at least parts of the vehicle wheel to be measured.

By this embodiment, a support of the center hole adjacent arranged parts of the vehicle wheel can be made during machining in the machining center in a simple manner. This increases the safety during processing, in particular special while drilling the bolt holes, against deflection of the motor vehicle wheel. Hereby, the quality of the processing can be increased. The invention further relates to a clamping unit for temporarily fixing during a measuring and machining operation of at least one motor vehicle wheel, comprising at least three, preferably six, concentric to a central axis displaceable clamping elements, which are suitable on the vehicle wheel, preferably on a rim flange of the vehicle wheel, to attack and to stretch the vehicle wheel in a predeterminable position and location. The clamping unit according to the invention has a measuring device according to the invention, wherein the actuator longitudinal axis of the measuring device is arranged in alignment with the central axis of the clamping unit.

The advantage of this Aufspanneinheit is that in an off-time of Bearbeitungszent rums, so while another car wheel is processed, the clamping and the Vermes sen can be done in the manner indicated above. As a result, the required measuring time for determining the position and / or position of the vehicle wheel before switching to the machining area of the machining center can be carried out and a tensioning and / or measuring within the processing space is eliminated. By combining with the measuring device according to the invention, the advantages already discussed above can also be applied to the clamping unit and will not be repeated here.

In addition, it can be provided that the clamping elements are formed in multiple stages for receiving motor vehicle wheels with different wheel diameters.

The gradual design of the clamping element top allows a simple way the inclusion of motor vehicle wheels, which usual wheel diameter of eg 15 to 22 inches aufwei sen. A motor vehicle wheel is placed with the rim flanges on corresponding Spannelemento berseiten or detents of the clamping elements and clamped by moving together of the concentric risch arranged to the central axis of the clamping unit clamping elements. Mitei nander corresponding latches thus form a virtual plane, which should be normal to the rotation axis of the vehicle wheel. A possibly "oblique" inserting a vehicle wheel is detected by the measuring device according to the invention early and can remain through the above-described measurement and determination of correction variables without qualita tive effect for the subsequent processing of the vehicle wheel. This will give a very fast and robust handling and u.ET. even automated manipulation of the vehicle wheels. Also advantageous is an embodiment according to which it can be provided that the measuring head of the measuring device is designed to be retractable in the rest position relative to a horizontal plane formed between the clamping elements.

The "countersinking" of the probe relative to the plane detents can effectively reduce the likelihood of damage to the gauge during insertion or removal of a vehicle wheel. The very robust and low-maintenance clamping unit or measuring device can therefore extend maintenance intervals and save associated repair and maintenance costs.

The method according to the invention for measuring an offset of a rotation axis and / or the position of a motor vehicle wheel clamped for machining in a mounting unit comprises the method steps:

- Providing a measuring device, which comprises a measuring device recording with a höhenver adjustable measuring head, wherein the measuring head with a, a Aktorlängsachse aufwei send, coupled actuator and is movable by means of the actuator in the direction of Aktorlängsachse between a measuring position and a rest position, and a Messvor Direction of at least one measuring means for measuring the offset of the rotational axis of the vehicle wheel based on position coordinates of a center hole in the transverse direction and / or axial direction of the center hole of the vehicle wheel relative to Aktorlängsachse, wherein the at least one measuring means is designed such that Surveying no relative rotation of the vehicle wheel to the measuring head is required and wherein the at least one measuring means for measuring the offset of the axis of rotation and / or the position of the vehicle wheel in transverse direction Rich and / or axial direction is either formed the position coordinates of the telloch with a through n to detect relative distance between the measuring head and the center hole to be measured vehicle wheel, or is adapted to detect the position coordinates of the center hole as a relative position of the measuring head in the measuring position deviating from the position of the measuring head in the rest position;

- moving the measuring head into the measuring position by means of an actuator; and

- Measuring the position of the center hole and / or the position of the vehicle wheel by either

Determining the relative distance between the measuring head and the axis of rotation of the vehicle wheel to be transmitted by means of the device arranged therefor, preferably at least two, especially Preferably, three, radially arranged in the radial direction sensor elements comprising measuring means, by measuring the position coordinates of the center hole at least two, preferably three, different points of the center hole, or

- Determining the relative position of the measuring head in the measuring position deviating from the Ruh position of, preferably a convex shape and a relative to the center hole larger maximum diameter having, measuring head by displacement of the measuring head and in the transverse direction and / or axial relative to the rest position relative to the Aktorlängsachse , Wherein the at least one measuring means for measuring the relative position of the measuring head in the measuring position, a deflection of the measuring head in the transverse direction and / or axial direction he summarizes;

- transmitting the position coordinates of the center hole as survey data to a plant control device;

- Use of the survey data as correction values for subsequent processing of the vehicle wheel with unchanged clamping of the vehicle wheel.

The advantage of the method according to the invention lies in the one-time clamping of the vehicle wheel in the clamping unit and the possibility of easily correcting the subsequent machining in terms of position and / or position. The case taking place Vermes solution and transmission of the position coordinates of the vehicle wheel is made possible in a relatively simple manner, without additionally required rotational movement of the measuring device or the vehicle wheel. Any deviations occurring or an offset of the vehicle wheel in the transverse and / or vertical direction can be efficiently determined and transmitted as correction variables on the Anla gene control to the machining center, whereby ETmspannen and / or re-measuring in the processing area can be efficiently avoided. Other advantages associated with the method result from the synopsis with the previously mentioned embodiments of the measuring device according to the invention, which are also claimed for the method at this point.

According to a further development, it is possible that during the measurement at the same time any offset of the center hole is determined relative to the central axis of the Aufspanneinheit and any Ver tipping the vehicle wheel. This allows a particularly safe and fast method to ensure a high quality in the processing of the vehicle wheel.

Furthermore, it may be expedient if, following the transmission, the correction quantities are used to determine corrected pinhole positions and then the machining of bolt holes takes place.

Particularly in the determination of the bolt hole positions, it has proved advantageous to forward the correction quantities from the determined method via the system control to the machining center, where it repositions accordingly, and u.ET. even a tilt to perform the bolt hole drilling. This can serve as the deciding factor in avoiding waste and thus ensuring high quality of motor cycles.

In addition, it can be provided that remains after the measurement of the measuring head in its measuring position and during processing of the bolt holes of the measuring head or a support surface of the actuator for support, preferably on a center hole in the radial direction outwardly adjacent contact surface of the vehicle wheel, a Damping force in Axi alrichtung applies.

The application of the damping force can be done with the inventive method from the same side as the measurement of the position coordinates of the center hole and thus the vehicle wheel, whereby an additional Ab support device is unnecessary. In addition, a predetermined damping force can reduce any vibrations, and / or delay and / or unwanted deflection of the vehicle wheel in the region of the center hole. This can be particularly advantageous in a u.U. oblique employment of a drilling tool and / or in motor vehicle wheels with filigree construction.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

In each case, in a highly simplified, schematic representation: Figure 1 is a schematic representation of a measuring device with deflectable measuring head for measuring an offset of the rotational axis of the vehicle wheel of the actuator longitudinal axis or central axis in the rest and measuring position.

Fig. 2 is a schematic representation of a measuring device with measuring head which the

Measuring an offset of the axis of rotation of the vehicle wheel of the actuator longitudinal axis or central axis is formed insertable into the center hole;

3 is a schematic sectional view of the functional principle of a measuring device with deflectable measuring head for measuring an offset of the rotational axis of the motor vehicle wheel from the actuator longitudinal axis or central axis in the rest position (a) and measuring position (b);

Fig. 4 is a schematic sectional view of the principle of operation of a measuring device with

Measuring head which is designed for measuring an offset of the rotational axis of the vehicle wheel of the actuator longitudinal axis or central axis inserted into the center hole in the rest position (a) and measuring position (b);

5 is a schematic sectional view of an embodiment with Längenmesselemen th on the actuator in the left half of the picture or as a length measuring rod in the right half of the figure;

Fig. 6 embodiment of a measuring device with communication device and

Energy supply device in the measuring head, or a charging device on or in the measuring device recording;

Fig. 7 oblique view of an embodiment of a clamping unit with integrated

Measuring device and multi-stage clamping elements.

By way of introduction, it should be noted that in the variously described embodiments, the same parts are provided with the same reference numerals or the same component designations, the disclosures contained in the entire description correspondingly apply mutatis mutandis to the same. che parts with the same reference numerals or the same component names transferred who can. Also, the position information selected in the description, such as above, un th, laterally, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

The inventive measuring device 1 for measuring an offset 10 of a Rotati onsachse 32 and / or the position of a tensioned for processing in a Aufspanneinheit 2 motor vehicle wheel 3 is shown schematically in Figs. 1 and 2. In both figures, the measuring device 1 has a measuring means receptacle 4 with an actuator 11 and at least one measuring means 6 coupled to the detector 11. Arranged on the actuator 11 in the vertical direction upward, a measuring head 5 can be seen. The measuring head 5 is designed to be adjustable in height relative to the measuring device receptacle 4 and coupled to the actuator 12 having an actuator longitudinal axis 12. In FIGS. 1 and 2, the rest position 9 of the measuring head can be seen in the left half of the illustration and a measuring position 8 can be seen in the respective right half of the image. The measuring head 5 is designed to be movable between the rest position 9 and the measuring position 8. The at least one measuring means 6 is arranged to determine the measurement of the offset 10 of the rotation axis 32 by means of position coordinates of the center hole 31 of the vehicle wheel 3 in at least the transverse direction 13 and / or the position of the center hole in the axial direction 14 relative to the actuator longitudinal axis 12 , The arrangement of the measuring means shown in FIGS. 1 and 2 requires for measuring the position coordinates of the center hole 31 no relative rotation of the vehicle wheel 3 relative to the measuring head 5 and / or the Aufspanneinheit second

In Fig. 1 is a schematic sectional view through the measuring device 1 is shown, in which a measuring means 6 is formed, the position coordinates of the center hole 31 as a relative position 17 of the measuring head 5 in the measuring position 8 deviating from the posi tion of the measuring head 5 in the rest position 9 to capture. As can be seen from FIG. 1, in conjunction with FIGS. 3 a and 3 b, in the measuring position 8 the measuring head is deflected in the transverse direction 13 when contacting the motor vehicle wheel 3 at the center hole 31. The movably arranged on the actuator 11 measuring head 5 thus allows a deflection of the measuring head 5 in the rela tivposition 17 in the transverse direction 13 and / or axial direction 14 and vertical direction. 2, a measuring device 1 according to the invention is shown schematically in cross-section, the at least one measuring means 6 being designed to measure the offset 10, the position coordinates of the central hole 31 being the relative distance 16 between the measuring head 5 and the center hole 31 to be measured of the vehicle wheel 3 to be measured. In the exemplary embodiment shown in FIG. 2, the diameter of the measuring head 5 is selected smaller than the diameter of the center hole 31. In this way, the measuring head in the measuring position 8 can be inserted into the center hole 31. As can be seen from FIG. 2, in conjunction with FIGS. 4 a and 4 b, the measurement of the relative distance 16 is effected by the measuring means 6.

FIG. 3 schematically illustrates the functional principle and a possible embodiment of a measuring means 6 for determining the position coordinates of the center hole 31 as a relative position 17 of the measuring head 5. In this case, the measuring head 5 in FIG. 3 has a convex shape in the axial direction 14 and a larger maximum diameter in comparison to the central hole 31. The measuring head 5 is mounted in the transverse direction 13 and / or axial direction 14 relative to the actuator longitudinal axis 12 slidably. In Fig. 3a, the measuring head 5 is set in the rest position 9 is. In the selected representation, the measuring means 6 at least one, preferably meh rere, sensor element 7, which detects a displacement or displacement relative to the longitudinal axis 12 of the actuator. It can be provided that a reference mark 36 is arranged with the sensor element 7 corresponding to the actuator 11. In Fig. 3b the measuring position 8 is shown schematically. It can be seen that a kind of self-centering and thereby a deflection of the measuring head 5 re relatively to the Aktorlängsachse 12 takes place by the convex shape of the measuring head 5 in the contacting of the measuring head 5 with the motor vehicle 3 in the region of the center hole 31. In this way, there is the ingestion of Messpo position 8 to a relative position 17 of the measuring head 5, which tion axis 32 of the motor vehicle 3 relative to the Aktorlängsachse 12 and the central axis 29 of the Aufspanneinheit 2 correlated with an offset 10 of the Rota. In this way, can be deduced very accurately and easily to the position of the axis of rotation 32 of the vehicle wheel.

The measuring means 6 or sensor elements 7 shown in FIG. 3 represent an exemplary arrangement which is particularly suitable for detecting a displacement in the transverse direction 13. However, it is within the scope of the invention that the arrangement of the at least one measuring means 6 is selected such that the displacement of the measuring head 5 takes place, for example, at least one inclined plane, whereby at the same time the detection of a transverse and axial displacement of the measuring head 5 relative to the actuator 11 can be detected. Also in this embodiment, not shown, the determination of the position coordinates of the center hole 31 is based on the relative position 17 of the measuring head 5 relative to the Aktorlängsachse 12 and the actuator 11 between rest position 9 and measuring position. 8

The measuring means 6 shown in FIG. 3 and FIG. 1 can comprise at least one optical and / or inductive and / or capacitive sensor element 7. As can be seen from FIG. 3, the sensor elements 7 can be arranged on the inside in the measuring head 5 and are thus efficiently protected against damage or contamination from the outside. Furthermore, it can be seen from FIG. 3b, in conjunction with FIG. 1, that by means of the measuring head 5 or the actuator 11 a damping force 37 can be applied in the vertical direction or axial direction 14 for supporting at least parts of the motor vehicle wheel 3 , By the convex shape of the measuring head 5, a kind of self-centering is achieved, whereby the introduction of force of the damping force 37 takes place homogeneously over the circumference.

Furthermore, an embodiment not shown is within the scope of the invention, in which the measuring means 6, which serves for the simultaneous measurement of the relative position 17 of the measuring head 5 in the transverse direction 13 and axial direction 14, is designed as a bending bar, which is arranged on or at least partially within the actuator 11 is and is coupled to the measuring head 5. Such a design of the measuring means 6 as a bending rod can also offer advantages in the determination and control of the damping force 37.

Analogously to the description of the illustration 3, a measuring device 1 is shown schematically in section in FIGS. 4a and b. The further and optionally independent embodiment of the measuring device 1 again uses the same reference numerals or component designations for the same parts as in the preceding FIGS. 1 to 3. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figures. In the selected representation, a section through one of two, preferably three, sensor elements 7 of the measuring means 6, which are arranged in the measuring head 5, is shown. In Fig. 4a, the rest position 9 ersicht Lich, in which the actuator 11 and coupled to the actuator 11 measuring head 5 is seen in gefah renem state. FIG. 4b shows the measuring position 8, wherein the at least one measuring means 6 is arranged as at least two, preferably three, radially and star-shaped Sensor elements 7 are arranged for measuring the position coordinates of the center hole 31 in the measuring head. In the illustration, the section through one of these sensor elements 7 and formed as a probe 19 sensor element 7 can be seen. The measuring means 6 or sensor elements 7 shown in FIG. 4 in conjunction with FIG. 2 can be designed as contactless distance sensors 18 or measuring probes 19 movable in the radial direction 15. The principle of a contactless distance sensor 18 is shown for clarity in FIG. 2 as dashed lines, which indicate the detection range of the distance sensor 18. In Fig. 4b is an exemplary arrangement of a movable probe 19 is shown schematically, which is designed to detect the relative distance 16 in the radial direction 15 extendable from. It has proven to be advantageous if the sensor elements 7 at least temporarily, for example, covered by an aperture, to the outside and thus protected. As shown in Fig. 4b, the measurement of the position coordinates of the center hole 31 by measuring the relative distance 16 between the measuring head 5 and the center hole 31, wherein this relative distance 16 to the offset 10 of the axis of rotation 32 relative to the actuator longitudinal axis 12 and central axis 29 correlates. In this way, it can be closed relatively easily by the knowledge of the position of the actuator longitudinal axis 12 to the position of the axis of rotation 32 rückge.

Furthermore, it is apparent from Fig. 4 that a support surface 21 on the actuator 11 in Radialrich device 15 is excellently arranged, which serves to rest on a center hole 31 in Radi alrichtung 15 outwardly adjacent contact surface 20 of the motor vehicle 3. By means of this support surface 21, the application of a damping force 37 for supporting at least parts of the motor vehicle wheel 3 in the vertical direction or axial direction 14 is possible.

FIG. 5 shows a further embodiment of the measuring device 1, which may be independent of itself, wherein the same reference numerals or component designations are again used for the same parts as in the preceding FIGS. 1 to 4 and FIG. 6. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figures. In Fig. 5 are two exemplary sectional views are shown, wherein the measuring means 6 and its Senso relemente 7 for determining a vertical displacement or vertical displacement 28 of the Ak sector 11 are shown schematically. This measuring element designed as a length measuring element 26 tel 6 can be used to determine the position of the motor vehicle wheel 3. Such a length measuring element 26 can be used in combination or as part of a previously mentioned measuring means 6, which is designed to determine an offset 10 in the transverse direction, or used independently as a measuring means 6 for the sole determination of the situation who the. According to the inventive idea, the measuring means 6 is not necessarily limited to an arrangement in the measuring head 5, but may optionally also be arranged on or at least partially within the measuring means receptacle 4 and / or the actuator 11. 5, the actuator 11 is shown in a deviating from the rest position 9 measuring position 8 in the left half of the figure. In this case, an additional length measuring element 26 for measuring the vertical displacement 28 of the actuator 11 is shown on the actuator 11. Analogous to the Ausführun gene of Fig. 3, such a length measuring element 26 may also be formed as an optical capacitive and / or inductive sensor element 7. The illustrated Referenzmarkierun conditions 36 on the measuring device receptacle 4 can be arranged for exact measurement of Vertikalverschie advertising 28, for example, on the inner wall of the measuring device receptacle 4, but are not necessarily dependent on the type of length measuring element 26 used. A particularly simple embodiment of a length measuring element 26 is shown in the right half of FIG. 5 as a length measuring rod 27, which detects a vertical displacement 28 of the actuator. The length measuring elements shown in Fig. 5 can be considered as an independent measuring means 6, which may be formed either in combination with a measuring means 6 of FIG. 1 to 4 or as an independent measuring means 6. The use of a length measuring element 26 and / or a measuring device, as shown in the preceding examples 1 to 4, serves in particular to detect a tilting and / or vertical position of the motor vehicle 3 deviating from an expected desired position.

It is particularly advantageous to form the measuring device 1 shown in FIGS. 1 to 7 with a pneumatic or hydraulic or electromechanical drive for applying a damping force 37 to the actuator 11 and thus to at least parts of the motor vehicle wheel 3 to be contacted.

FIG. 6 shows a measuring device 1 according to the invention, wherein the measuring device 6 has a wireless communication device 22 for transmitting the position coordinates of the central hole 31 as surveying data to a system control device 23. The communication device 22 is preferably as a WLAN or Bluetooth transmitting or. Receiving device formed. Furthermore, it can be seen from FIG. 6 that, to avoid power supply cables on or within the actuator 11, a device 24 for supplying power supply 24 is arranged within the measuring head 5. In this way, the measuring means 6 and the sensor elements 7 and an optional communication device 22 are supplied with energy. Dashed lines show the measuring head in the rest position 9. In this rest position 9, the measuring head 5 or its energy supply device 24 comes in the Na hebereich a corresponding loading device 25, which is preferably arranged on the measuring device receptacle 4. The communication device 22 and / or the power supply device 24 and the corresponding charging device 25 illustrated in FIG. 6 are compatible with all the embodiments described above.

In Fig. 7, a clamping unit 2 according to the invention for temporary fixation during egg nes surveying and / or machining operation of a motor vehicle 3 is schematically Darge presents. The clamping unit 2 has in the selected representation six concentrically to a central axis 29 and Aktorlängsachse 12 movably arranged clamping elements 30. The vehicle wheel 3 is attacked or tightened by moving together the clamping elements 30 on the rim flange 33 at six points. After tensioning the vehicle wheel 3, a measuring operation can be carried out by means of the measuring device 1. The measuring position 8 of the measuring head 5 is shown by dashed lines. As can be seen from Fig. 7, the Aktorlängs axis 12 coincides with the central axis 29 of the clamping unit together. The clamping elements 30 wei sen several stages, whereby motor vehicle wheels 3 can be recorded with different Raddurchmessem 34. The clamping unit 2 according to the invention or the measuring device 1 according to the invention enable, in the aforementioned manner, a very rapid and reliable detection of a possible inclined position of the vehicle wheel 3 within the clamping unit 2 in the clamping elements 30.

A clamping unit 2, as shown in Fig. 7, may be formed as part of a machining center in such a swivel, whereby the one-time clamping of the motor vehicle Ra in the Aufspanneinheit 2 can be maintained. Preferably, two clamping units 2, which are alternately located in the processing area, are used. On the span and / or measuring of the vehicle wheel 3 and the offset 10 of the center hole 31 can thus take place in the off-time and already outside the processing area. According to the inventive idea, any offset 10 of the axis of rotation 32 of the motor vehicle wheel 3 relative to the central axis 29 and Aktorlängsachse 12 can be measured in a simple and secure manner. The Plant control device 23 receives from the measuring means the position coordinates of the center hole 31 as surveying data, which are subsequently used as correction quantities for the subsequent processing of the motor vehicle wheel 3 with unchanged clamping in the clamping unit 2. In this way, the time-consuming and expensive measurement of, for example, the pinhole positions within the processing space of the machining center is obsolete. In the arrangement shown by way of example in Fig. 7, the processing or drilling tion of the bolt holes 35 can be made directly to the transmission of Korrek turgrößen to determine corrected pinhole positions. In conjunction with FIGS. 1, 2, 3b and 4b, it is clear that the measuring head 5 or a support surface 21 of the actuator 11 for supporting at least parts of the motor vehicle 3 by means of a damping force 37 in the axial direction 14 ver can be used.

The embodiments show possible embodiments, it being noted at this point be that the invention is not limited to the specifically illustrated embodiments dersel ben, but also various combinations of the individual Ausfüh insurance variants are mutually possible and this variation possibility due to the teaching of technical action representational invention in the skill of those skilled in this technical field.

The scope of protection is determined by the claims. However, the description and drawings are to be considered to interpret the claims. Individual features or feature combinations from the illustrated and described different Ausführungsbeispie len can represent for themselves inventive solutions. The independent inventive solutions underlying task can the description taken from who the.

All information on ranges of values in objective description should be understood to include these arbitrary and all sub-ranges thereof, eg the indication 1 to 10 should be understood as including all sub-ranges, starting from the lower limit 1 and the upper limit 10 are, ie all subregions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, eg 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10. For the sake of order, it should finally be pointed out that, for a better understanding of the structure, elements have been shown partly out of scale and / or enlarged and / or reduced in size.

Reference Designation Measuring Device 24 Power Supply Device Clamping Device 25 Charging Device

Car wheel 26 length measuring element

Measuring device holder 27 Length measuring rod

Measuring head 28 Vertical calibration

Measuring means 29 Central axis

Sensor element 30 clamping element

Measuring position 31 center hole

Rest position 32 Rotation axis of the vehicle wheel Offset 33 Rim horn

Actuator 34 wheel diameters

Actuator longitudinal axis 35 Bolt hole

Transverse 36 Reference mark

Axial direction 37 damping force

radial direction

relative distance

relative position

distance sensor

probe

contact surface

From support surface

communication device

Conditioning control device

Claims

Patent claims

1. Measuring device (1) for measuring an offset (10) of a rotation axis (32) and / or the position of a vehicle in a clamping unit (2) tensioned vehicle wheel (3) comprising

a measuring means receptacle (4) which comprises a height-adjustable measuring head (5), the measuring head (5) being coupled to an actuator (11) having an actuator longitudinal axis (12) and being moved in the direction of the actuator longitudinal axis (12) by means of the actuator (11) is designed to be movable between a measuring position (8) and a rest position (9), and

at least one measuring means (6) for measuring the offset (10) of the rotational axis (32) of the motor vehicle wheel (3) on the basis of position coordinates of a center hole (31) in the transverse direction (13) and / or axial direction (14) of the center hole (31 ) of the motor vehicle wheel (3) relative to the actuator longitudinal axis (12),

wherein the at least one measuring means (6) is designed such that for the measurement no relative rotation of the motor vehicle wheel (3) to the measuring head (5) is required and

wherein the at least one measuring means (6) for measuring the offset (10) of the rotation axis (32) and / or the position of the motor vehicle wheel (3) in the transverse direction (13) and / or axial direction (14):

- Is designed to detect the position coordinates of the center hole (31) as a relative distance (16) between the measuring head (5) and the center hole (31) to be measured vehicle wheel (3), or

- Is designed to detect the position coordinates of the center hole (31) as a relative position (17) of the measuring head (5) in the measuring position (8) deviating from the position of the measuring head (5) in the rest position (9).

2. Measuring device (1) according to claim 1, characterized in that the measuring head (5) for measuring the relative distance (16) between the measuring head (5) and the vermes to send vehicle wheel (3) has a smaller diameter than the center hole (31 ) of the vehicle wheel (3) and thus the measuring head (5) in the measuring position (8) in the central hole (31) is insertable, wherein the at least one measuring means (6) at least two, preferably three, ra dial and star-shaped arranged sensor elements (7) for measuring the Positionskoordina th of the center hole (31) as a respective relative distance (16) of the respective sensor element (7) from the central hole (31).

3. Measuring device (1) according to claim 2, characterized in that the sensor elements (7) are designed as contactless distance sensors (18) or in the radial direction (15), movable measuring probes (19).

4. Measuring device (1) according to claim 2 or 3, characterized in that the actuator (11) for resting on a central hole (31) in the radial direction (15) outwardly adjacent contact surface (20) of the motor vehicle wheel (3) suitable and with respect to the measuring head (5) in the radial direction (3) projecting support surface (21).

5. measuring device (1) according to claim 1, characterized in that the measuring head (5) has a convex shape in the axial direction (14) and a relative to the central hole (31) larger ßeren diameter,

and in the transverse direction (13) and / or axial direction (14) relative to the actuator longitudinal axis (12) is slidably mounted ver, and

wherein the at least one measuring means (6) for measuring the position coordinates of the center hole (31) on the basis of the relative position (17) of the measuring head (5) in the measuring position (8), the art is formed such that in the measuring position (8) a deflection of the measuring head (5) in the transverse direction (13) and / or axial direction (14) relative to the rest position (9) can be detected.

6. Measuring device (1) according to claim 5, characterized in that the at least one measuring means (6) comprises at least one optical and / or inductive and / or a capacitive sensor element (7).

7. Measuring device (1) according to claim 5 or 6, characterized in that for simultaneous measurement of the relative position (17) of the measuring head (5) in the transverse direction (13) and axial direction (14) of the measuring head (5) at one within the actuator (11 ), designed as a bending rod measuring means (6) is mounted.

8. Measuring device (1) according to one of the preceding claims, characterized in that the at least one measuring means (6) within the measuring head (5) is arranged from the outside at least temporarily hidden from view.

9. Measuring device (1) according to one of the preceding claims characterized in that the measuring means (6) a wireless, preferably wireless or Bluetooth, communication device (22) for transmitting the position coordinates of the center hole (31) as surveying data to a plant control device ( 23).

10. Measuring device (1) according to one of the preceding claims characterized in that the measuring means (6) to avoid, the actuator (11) and / or the measuring head (5) penetrating, power supply cables one, preferably by inductive and / or capacitive, in the rest position (9) rechargeable Energieversorgungsvorrich device (24).

11. Measuring device (1) according to claim 10, characterized in that a with the power supply device (24) corresponding charging device (25) on the measuring means receiving (4) is arranged.

12. Measuring device (1) according to one of the preceding claims characterized in that an additional length measuring element (26), preferably a length measuring rod (27), for measuring a vertical displacement (28) of the actuator (11) coupled to the actuator (11) GE is.

13. Measuring device (1) according to one of claims 4 to 12 characterized in net that the actuator (11) a pneumatic, hydraulic or electromechanical drive to apply a damping force (37) on at least parts of the vehicle wheel to be measured (3). includes.

14. clamping unit (2) for temporarily fixing during a surveying and machining operation of at least one vehicle wheel (3) comprising at least three, preferably six, concentric with a central axis (29) displaceable clamping elements (30), wel che for clamping the vehicle -Rades (3), preferably on a rim flange (33) of the vehicle wheel (3) attacking, are suitable and a measuring device (1) according to one of claims 1 to 14, wherein the Aktorlängsachse (12) of the measuring device (1) with the central axis (29) of the clamping unit (2) is arranged in alignment.

15. clamping unit (2) according to claim 14, characterized in that the clamping elements (30) in multiple stages for receiving vehicle wheels (3) with different Raddurch diameter (34) are formed.

16. clamping unit (2) according to one of claims 14 or 15 characterized in that the measuring head (5) of the measuring device (1) in the rest position (9) relative to egg ner horizontal formed between the clamping elements (30) plane retractable out is.

17. A method for measuring an offset (10) of a rotation axis (32) and / or the position of a trained for processing in a, preferably according to one of claims 14 to 16, clamping unit (2) tensioned vehicle wheel (3), comprising Procedural steps:

- Providing a measuring device (1), preferably formed according to one of Ansprü che 1 to 14, which comprises a measuring means receptacle (4) with a height-adjustable measuring head (5), wherein the measuring head (5) having a, a Aktorlängsachse (12), Ak gate (11) coupled and by means of the actuator (11) in the direction of Aktorlängsachse (12) between a measuring position (8) and a rest position (9) is designed to be movable, and a measuring device (1) at least one measuring means (6), for measuring the offset (10) of the rotational axis of the vehicle wheel (3) based on position coordinates of a center hole (31) in the transverse direction (13) and / or axial direction (14) of the center hole (31) of the vehicle wheel (3) relative to Aktorlängsachse (12),

wherein the at least one measuring means (6) is designed such that for the measurement no relative rotation of the motor vehicle wheel (3) to the measuring head (5) is required, and

- Is designed to detect the position coordinates of the center hole (31) by a Relativab stand (16) between the measuring head (5) and the center hole (31) to be measured vehicle wheel (3), or

- Is designed to detect the position coordinates of the center hole (31) as a relative position (17) of the measuring head (5) in the measuring position (8) deviating from the position of the measuring head (5) in the rest position (9); - Moving the measuring head (5) in the measuring position (8) by means of actuator (11); and

- Measuring the position of the center hole (31) and / or the position of the vehicle wheel (3) by either:

- Determining the relative distance (16) between the measuring head (5) and the axis of rotation of the vehicle wheel to be measured (3) by means of the arranged, preferably at least three star-shaped in the radial direction (15) arranged sensor elements (7) comprising, measuring means (6) by measuring the position coordinates of the center hole (31) at least two, preferably three, different points of the center hole (31),

or

- Determining the relative position (17) of the measuring head (5) in the measuring position (8) differing from the rest position (9) of, preferably a convex shape and relative to the center hole (31) larger maximum diameter having, measuring head (5) by displacement of the Measuring head (5) and in the transverse direction (13) and / or axial direction (14) relative to the Ruheposi tion (9) relative to Aktorlängsachse (12) wherein the at least one measuring means (6) for measuring the relative position (17) of the measuring head (5) in the measuring position (8) detects a deflection of the measuring head (5) in the transverse direction (13) and / or axial direction (14);

- transmitting the position coordinates of the center hole (31) as survey data to a plant control device (23);

- Use of the survey data as correction variables for subsequent processing of the vehicle wheel (3) with unchanged clamping of the vehicle wheel (3).

18. The method according to claim 17, characterized in that during the measurement at the same time a possible offset (10) of the center hole (31) relative to the central axis (29) of the Aufspanneinheit (2) and a possible tilting of the vehicle wheel (3) is determined.

19. The method according to any one of claims 17 or 18, characterized in that following the transmission, the correction quantities are used for determining corrected Bol zenlochpositionen and then the processing of Bolzenlöchem (35).

20. The method according to any one of claims 17 to 19, characterized in that after the measuring operation of the measuring head (5) remains in its measuring position (8) and during the processing of the bolt holes (35) of the measuring head (5) or a support surface (21) of the Ak sector (11) for supporting, preferably at a the center hole (31) in the radial direction (15) outwardly adjacent contact surface (20) of the motor vehicle Rades (3), a damping force (37) in the axial direction (14) applies.