WO2024061743A1

WO2024061743A1 - Apparatus and method for determining properties of a brake disc

Info

Publication number: WO2024061743A1
Application number: PCT/EP2023/075333
Authority: WO
Inventors: Ahmed Nourdine; Andre Wendt
Original assignee: AuE Kassel GmbH; Zf Friedrichshafen Ag
Priority date: 2022-09-21
Filing date: 2023-09-14
Publication date: 2024-03-28
Also published as: DE102022124269A1

Abstract

The present invention relates to an apparatus (1) for determining properties of a brake disc (2), having at least one disc interface (3), at least one floating calliper interface (4) and at least one first distance sensor (5), wherein the disc interface (3) is provided for interacting with a brake disc (2), wherein the floating calliper interface (4) is designed for connection to a floating calliper holder (6) of a wheel carrier (7). An apparatus (1) for determining properties of a brake disc (2), with which the position tolerances of a brake disc, in particular a brake disc mounted on a wheel carrier, can be checked, is realised in that the first distance sensor (5) is held movably relative to the floating calliper interface (4).

Description

AuE Kassel GmbH, Heinrich-Hertz-Straße 52, 34123 Kassel

ZF Friedrichshafen AG, Löwentaler Straße 20, 88046 Friedrichshafen

“Device and method for determining the properties of a brake disc”

The invention relates to a device and a method for determining the properties of a brake disc. The device has at least one disc interface for interacting with a brake disc, in particular mounted on a wheel carrier. Furthermore, the device has at least one floating saddle interface and at least one distance sensor. The floating saddle interface is designed for connection to a floating saddle receptacle of a wheel carrier.

Vehicle wheel carriers are used, among other things, to attach a wheel to a vehicle axle. The brake disc that rotates during ferry operation is usually also mounted on the wheel carrier. The unit consisting of wheel carrier and brake disc is often pre-assembled and then attached together to a vehicle axle. Position or geometry deviations resulting from the production and/or assembly of the individual components of the wheel carrier or the production of the brake disc can lead to an insufficiently precise positioning of the brake disc relative to the floating caliper and thus also relative to the brake pads when assembled. This can lead to unwanted vibrations or noise when driving or braking. High quality demands from vehicle customers, but also new requirements for smooth running, which result from the reduced noise environment in electromobility, make it necessary to keep the precise concentricity and positioning of rotating components, especially brake discs, within a certain tolerance range. The invention is therefore based on the object of specifying a device and a method for determining properties of a brake disc, with which the properties of a brake disc that influence the concentricity properties, in particular a brake disc mounted on a wheel carrier, can be checked.

The task mentioned at the beginning is achieved in a generic device according to the characterizing part of claim 1 in that the distance sensor is held movable relative to the floating saddle interface.

In order to be able to determine with sufficient accuracy geometric and/or positional properties that influence the concentricity of the brake disc, in particular of a brake disc mounted on a wheel carrier, a measurement of distances between a first flat side of a brake disc and the calibrated device can, for example, be carried out. Based on a measurement of distances at at least three measuring points on at least two different radii of the brake disc, for example, a positional deviation of the brake disc, for example an angular deviation relative to a reference surface, can be determined. A flat run-out of the brake disc can be carried out, for example, by measuring at least one measuring point on a radius of the brake disc during a 360° rotation of the brake disc.

According to the invention, in order to carry out a measurement, at least one first distance sensor is held on the device at least on a first flat side of the brake disc, which is relatively movable relative to the floating caliper interface of the device. The first distance sensor is in particular held in such a way that it can be moved to different radii of the brake disk when the brake disk is mounted on the device. Preferably, exactly a single distance sensor is provided for a flat side of the brake disc. The one distance sensor is in particular arranged in such a way that, when the brake disc is arranged in the device, it points to the first flat side - for example an upper or a lower one Flat side - the brake disc is aligned. The at least one distance sensor is preferably designed and arranged in such a way that a distance between the distance sensor and a brake disk that can be arranged in the device can be determined.

For example, it is also provided that a plurality of distance sensors are present and that the distance sensors are arranged to be movable relative to the floating saddle interface. The distance sensors are in particular arranged in such a way that, when the brake disc is arranged in the device, they are aligned with a common flat side, for example the first flat side, of the brake disc.

The movable arrangement allows at least the first distance sensor to be moved to different measuring points on the radius of the brake disc to carry out measurements. It is preferably provided that at least one measurement, in particular of a distance, is carried out at each of the measuring points. Alternatively, it is provided, for example, that at least one measurement, in particular a distance, is carried out during a movement of the first distance sensor.

The distance sensor is preferably movable, in particular pivotable, in an imaginary plane. The floating saddle interface in particular has at least one mounting surface for interacting with a floating saddle receptacle of a wheel carrier. In particular, at least two recesses with internal threads are provided in the mounting surface, so that the floating saddle receptacle can be screwed to the floating saddle interface. The floating saddle interface is preferably connected to the floating saddle receptacle in the same way as a floating saddle when assembled in a vehicle. It is advantageously provided that the floating saddle interface, in particular the mounting surface, spans an imaginary plane F, and that the distance sensor is advantageously movable, in particular pivotable, in a plane E that is essentially parallel to the plane F. The offset of plane E to plane F becomes - like explained below - determined as part of the calibration of the device and taken into account in calculations using the measured values.

In order to have properties of the brake disc, e.g. B. to determine a flat angle, an angular position of the brake disc to a mounting surface for a floating caliper seat or the variance of the thickness of the brake disc - as described above - with the one distance sensor, for example, a measurement of a distance at three different measuring points on at least two different ones Radii of the brake disc are carried out or the brake disc rotates during a continuous measurement with the distance sensor. For example, the above-mentioned properties of the brake disc can be calculated from the measured values obtained, in particular with a control device of the device. The control device has, for example, at least one processor and at least one memory. The control device is designed and set up in such a way that it can determine at least the lateral runout and/or a positional deviation, in particular an angular deviation to the mounting surface of the floating caliper interface, from the distance measurements at three different measuring points on the flat side of the brake disc.

In order to calculate a positional deviation of the brake disc relative to a reference plane, for example a plane F of the floating caliper interface, which in the assembled state is parallel to a corresponding mounting surface of the floating caliper receptacle, distance measurement values are determined at different measuring points as described. The relationship between a first distance sensor or a second distance sensor to the imaginary plane F of the floating saddle interface is calibrated, for example, based on a measurement on a measured setup master disk. The measurement on the setup master disk provides the offset measurement values in order to be able to mathematically relate the later measurement values to the imaginary plane F of the floating saddle interface. As an alternative to using the setup master disk, it is provided that the device is measured once and determined in the process Distances between the components of the device are taken into account in calculations.

The distance sensor is designed, for example, as an optical sensor, capacitive sensor or acoustic sensor.

Due to the arrangement of the distance sensor being movable relative to the floating caliper interface, the device can be used for brake discs of different diameters and sizes. The invention has the advantage over the prior art that a large number of properties of the brake disc, in particular the brake disc mounted on a wheel carrier, can be determined with just a single distance sensor. This also reduces the cost of the device.

According to a first embodiment of the device, it has proven to be particularly advantageous if it is provided that the distance sensor is held rotatably about a rotation axis A that is spaced from the distance sensor. The distance sensor can be pivoted, for example, over at least the first flat side of the brake disc at a fixed distance from the brake disc in order to control different measuring points or measuring positions. The movement of the distance sensor over the brake disc takes place, for example, in partial circles. Preferably, the disk interface is also designed to be rotatable, so that the brake disk can also be rotated during a measurement or between two measurements. By rotating the distance sensor and turning the brake disc, any position on the first flat side of the brake disc can be reached with the distance sensor for a distance measurement. It is also provided that the distance sensor is held at a radius for at least one measurement and the brake disc is rotated, preferably rotated by at least 360°.

In particular, it is also provided that the rotation of the distance sensor and/or the rotation of the brake disc is carried out manually, for example by a user. It is preferably provided that the disk interface is designed for manual rotation by a user. For this purpose, the disk interface advantageously has a grip ring or a grip disk.

For example, it is provided that the device has at least one fixing device, and that the distance sensor can be fixed with the fixing device in at least one, preferably at least two or at least three, rotational or pivoting positions, i.e. at certain measuring points. In particular, it is provided that automatic fixation, e.g. B. latching, the fixing device takes place.

For example, the fixing device has at least one dial in order to be able to set rotation or pivot angles. It is also provided that the fixing device enables the distance sensor to be continuously fixed in any pivoting position.

With a distance sensor that can be pivoted or rotated, the measurement accuracy depends largely on the squareness of the mounting surface of the floating caliper interface, e.g. B. plane F, to the axis of rotation A. Even with very precise production, a certain tolerance for squareness cannot be avoided. A bearing for rotating the distance sensor about the rotation axis A is carried out, for example, with preload in order to eliminate play and achieve high rigidity. This achieves a high level of repeatability.

When using only a single distance sensor per flat side of the brake disc, the use of a set-up master disc for calibration can advantageously be dispensed with. Since the distance between the distance sensor and, for example, the first flat side of the brake disc as an individual measured value is not the aim of the measurement and only the difference between the measured values at the three measuring points is important, it is sufficient if the device is measured once before use . The distance sensor is preferably always pivoted through the same angle, so that a determination of the distance from the mounting surface to at least one reference point on the Distance sensor or a sensor arm is sufficient to determine the relative position of a plane to be determined by the three measuring points and the plane of the mounting surface of the floating saddle interface.

It is preferably provided that the measurement values of the device can be checked during operation with a test element. For this purpose, the test element is mounted in the device and it checks whether the distances or deviations initially measured during the measurement are still unchanged. The elimination of the use of a setup master disk is an advantage because the measurement errors that arise when measuring the setup master disk can be eliminated as additional uncertainty.

The distance of the distance sensor to the axis of rotation A determines the radius of the circle or a partial circle in which the distance sensor can be rotated. Preferably it is also provided that the distance of the distance sensor from the axis of rotation A is adjustable. For example, the distance of the distance sensor to the axis of rotation A can be adjusted in preset steps or continuously.

In particular, in order to be able to adjust the device for use with brake discs of different thicknesses or with brake disc pots of different heights, it is provided according to a further embodiment that the distance sensor is held movable parallel to the axis of rotation A. It is preferably provided that the distance sensor is held movable parallel to the axis of rotation A in preset steps or continuously. This allows the distance of the distance sensor to the first flat side of the brake disc to be adjusted and the device can thus be adapted to different types of brake discs.

A further embodiment of the device provides that at least the first distance sensor is translationally movable, in particular relative to the floating saddle interface. For example, the device has at least one carriage for this purpose on, which is movably guided on at least one rail. The first distance sensor is preferably movable in the radial direction towards and away from a brake disc mounted in the device. In particular, the first distance sensor is held in such a way that it can be moved toward and away from a rotation axis Z of the disk interface. For example, it is provided that the distance sensor can be moved manually in translation. Preferably, certain positions are provided - in particular along a rail - at which the distance sensor can be fixed with a fixing means. Alternatively, it is also provided in particular that the first distance sensor can be moved in translation - in an automated manner - using a drive means. The drive means preferably has a linear motor or a motor with a gear or a gear and a toothed rail.

Due to the translational mobility of at least the first distance sensor, every radius on a brake disc that can be mounted in the device can be reached with the distance sensor. In combination with rotation of the brake disc, every point on the brake disc can be reached for measurement using the distance sensor.

In particular, it is provided that the device is designed such that at least the first distance sensor is held both rotatable about a rotation axis A spaced from the distance sensor and translationally movable. This design further increases the flexibility of the device for use with different brake discs and wheel carriers.

The range of properties that can be determined with the device can be advantageously expanded by providing, according to a further embodiment, that at least two distance sensors are present and that both distance sensors are held movable relative to the floating saddle interface. Preferably, the two distance sensors can be moved simultaneously, i.e. parallel to one another. However, it is also provided that the two distance sensors can be moved independently of one another. A first Distance sensor is preferably arranged such that it is directed towards a first flat side of a brake disk when the brake disk is arranged at the disk interface. A second distance sensor is advantageously arranged such that it is directed towards a second flat side of the brake disk when the brake disk is arranged at the disk interface.

Preferably, the two distance sensors are arranged coaxially on a common axis in opposite measuring directions. As a result, the two distance sensors can always be moved parallel to one another, with the first distance sensor being set up for measuring on a first flat side of the brake disc and the second distance sensor being set up for measuring on a second flat side of the brake disc.

By measuring the distances on the opposite flat sides of the brake disc, the variation in the thickness of the brake disc can, for example, be calculated based on the measured values obtained by the two distance sensors. In addition, the measured values of both distance sensors can be related to the imaginary plane F of the floating caliper interface in order to calculate relative deviations of each of the flat sides of the brake disc from this plane. It is advantageously provided that the two distance sensors can be moved in two mutually parallel planes.

For example, both distance sensors are held together so that they can pivot about a rotation axis A arranged at a distance from the two distance sensors, so that both distance sensors can be moved in partial circles over the respective flat side of a brake disc. Alternatively or additionally, it is advantageously provided that the first distance sensor and the second distance sensor can be moved in a translational manner, in particular relative to the floating caliper mount. For example, it is provided that both distance sensors are arranged coaxially on a common axis and can be moved in a translational manner parallel to one another - the first distance sensor is arranged on the first flat side of the brake disc and the second distance sensor on the second Flat side of the brake disc. Both distance sensors are preferably held so as to be movable in a translational manner in the radial direction relative to a brake disc that can be arranged in the device. Both distance sensors are preferably held on at least one carriage that can be moved along at least one rail. The orientation and/or a height of the rail can preferably be changed.

In particular, it is provided that at least one distance sensor - the first distance sensor or the second distance sensor - can be moved parallel to the axis of rotation A. At least the distance sensor is advantageously displaceable along the axis of rotation A, which is aligned with the second - lower - flat side of the brake disc. It is preferably provided that both distance sensors are movable to the axis of rotation A, and in particular are also held movable relative to one another along the axis of rotation A. However, it is particularly advantageous for the distance between the distance sensors to one another to be fixed.

According to a further embodiment of the device, the arrangement of a wheel carrier in the device for carrying out measurements can advantageously be simplified in that the disk interface is aligned essentially horizontally. This allows a wheel carrier with a brake disc attached to it to be easily placed on the disc interface and secured in the device. For example, it is provided that the brake disc is connected to the disc interface, in particular screwed.

It is preferably provided that the disk interface can be rotated by at least one disk drive means. For example, a drive motor, in particular a servo motor, is provided with which the disc interface and thus the brake disc can be rotated, in particular rotatable in two directions. The drive of the disk interface is advantageously designed such that the disk interface can be rotated in predefined steps. According to a further embodiment, the arrangement of the distance sensors on the device can be advantageously designed in that at least one sensor arm is present, and in that the sensor arm has an arm base and at least one web extending essentially orthogonally to the arm base. The distance sensor is arranged on the web.

The axis of rotation A, about which the distance sensor can be rotated, preferably runs longitudinally through the sensor arm or the arm base. The distance sensor is arranged in the end region of the web that extends orthogonally to the arm base, so that when the sensor arm is rotated, the web can be moved essentially parallel to a flat side of a brake disk that can be arranged in the device. The distance sensor is held on the bridge and moves together with the bridge.

It is particularly preferred that a second web extending orthogonally to the arm base is present on the arm base. The second distance sensor is arranged on the second web. The second web is arranged at a distance from the first web and extends essentially parallel to the first web. In the operating state, the brake disc can be arranged between the two webs by rotating the sensor arm accordingly. The first distance sensor and the second distance sensor are preferably arranged coaxially on their respective web for measurement in opposite directions on an imaginary axis. In this way it is ensured that when the arm base rotates, both webs pivot parallel to a first flat side and to a second flat side of a brake disk that can be arranged in the device and the distance sensors are moved in partial circles over the flat sides of the brake disk.

For example, it is provided that the sensor arm with the first web and the second web is held on a carriage which can be moved along a rail - manually or automatically. This means that the first distance sensor and the second distance sensor is kept both rotatable and translationally movable.

According to a further embodiment of the device, it has proven to be advantageous if it is provided that the rotatably held sensor arm, in particular the sensor arm that can be rotated about an axis A running through the arm base, can be rotated via a drive means. The drive means can be controlled, for example, by a control device of the device, which in particular also processes the measured values. The drive means has, for example, at least one servo motor with which the sensor arm can be moved directly. It is also provided that the drive means further comprises at least one transmission means in order to transmit a rotation of the servomotor to the sensor arm. For example, the transmission means is designed as a drive belt, drive chain, gear and/or gear.

As already described above, when using exactly one distance sensor per flat side of the brake disc, the use of a master set-up disc can be omitted. For this purpose, it is intended that the device be measured once. For example, in this measurement, the distances - in a direction parallel to the rotation axis A of the device - in at least three orientations of the device, i.e. at at least three different pivoting positions - measuring positions - between the mounting surface of the floating saddle interface and a reference point on the distance sensor or on a surface of the first Steges determined.

For example, the three measuring positions are a middle position ZO, a right position ZR and a left position ZL. When measuring, the middle position is preferably considered the zero position. The deviations of the left position and the right position from the zero position can then be taken into account as an offset of the device when calculating properties of the brake disc. These deviations correspond to the error caused by an approximate perpendicularity between the mounting surface and the Axis of rotation A - or no complete parallelism of the plane F of the mounting surface and the plane in which the distance sensor or the distance sensors is/are pivoted - can be achieved. The distance in the zero position and in the two other positions usually does not change during operation, so that there is no need to use a setup master disk.

A change in the distances can occur, for example, if there is a mechanical impact on the device. In order to rule out changes to the device, it is provided that a measurement is carried out with a test element at regular intervals. During the measurement, the deviations determined during the measurement can be confirmed or it can be determined that the system needs to be overhauled.

An advantageous embodiment of the device provides that the device comprises at least one control device, and that the control device is designed and set up to move the distance sensor in partial circles. With the control device, for example, the drive means of the device, in particular the servo motor, can be controlled in such a way that the distance sensors can be moved to predetermined measuring points on the flat sides of the brake disc, or that the distance sensors carry out certain movement profiles parallel to the flat sides of the brake disc. The drive patterns required to sweep over partial circles are stored, for example, in a memory of the control device.

It is advantageously provided that the control device is designed and set up to move the distance sensors to predetermined measuring positions or measuring points and then to control the distance sensors to carry out at least one measurement. The distance sensors are preferably held stationary at the predetermined measuring points on the respective flat side of the brake disc at least for the duration of the implementation of at least one measurement. In particular, it is also provided that the control device is designed and set up in such a way that at least one measurement with the distance sensors is carried out continuously during the movement of the distance sensors or during a continuous movement to certain measuring points relative to the flat side of the brake disc. This makes it possible, for example, to generate a series of measured values that represent a distance profile of the flat side of the brake disc to the distance sensor. The series of measured values or the distance profile can be used to calculate the properties of the brake disc or its position relative to the wheel carrier.

However, it is particularly preferably provided that the control device is set up and designed to temporarily pivot the distance sensor or sensors to discrete measuring points and to hold the measurement there at least for the duration.

The task mentioned at the beginning is also solved by a method for determining the properties of a brake disc. The method is preferably carried out using a device according to one of the exemplary embodiments described. The device with which the method is carried out has at least one disc interface for interacting with a brake disc attached to a wheel carrier, at least one floating caliper interface and at least one distance sensor. The floating saddle interface is designed to be connected to a floating saddle receptacle of a wheel carrier. The method is characterized in that at least the following process steps are included:

Moving at least the first distance sensor relative to the floating saddle interface to a first measuring point, carrying out at least one measurement at the first measuring point. The at least one distance sensor is consequently moved relative to the floating saddle interface at least to a predefined measuring point. Preferably, the distance sensor is pivoted on a circular path to the predetermined measuring point. The distance sensor is held at the first measuring point at least for the duration of a measurement and the measurement is carried out until a desired measured value, in particular a distance between the distance sensor and the flat side of the brake disc, is determined. It is also provided that the distance sensor is held at the measuring point and a measurement is carried out while the brake disc is rotated, in particular by at least 360°. This makes it possible, for example, to determine the layout of a flat side. Preferably, the lateral runout on both flat sides of the brake disc is determined simultaneously by measuring with two distance sensors arranged opposite one another.

It is also provided that the distance sensor is moved translationally as part of carrying out the method or that the distance sensor is pivoted and moved translationally.

According to a further embodiment of the method, it is provided that after carrying out the measurement at the first measuring point, the distance sensor is moved, in particular pivoted and/or moved translationally, to at least one second measuring point in order to carry out at least one measurement there. In particular, it is further provided that after carrying out the measurement at the second measuring point, the distance sensor is moved, in particular pivoted and/or moved translationally, to a third measuring point in order to carry out a measurement there.

A further embodiment of the method advantageously provides that the movement of the distance sensor and the measurement take place dynamically, so that a measurement is carried out at a specific measuring point without interrupting the movement. This significantly reduces process times. Alternatively, it is provided that the movement to carry out the measurement on one Measuring point is temporarily interrupted, at least for the duration of the measurement. The movement is then continued, in particular to a second or a third measuring point.

The method is particularly suitable for implementation with two distance sensors which are aligned coaxially with one another in opposite directions for measurement on a common axis. Both distance sensors are therefore moved parallel to one another, in particular pivoted, in order to simultaneously carry out a measurement on both flat sides of a brake disc. The simultaneously obtained measured values of a first distance sensor and a second distance sensor can also be used to determine further geometric properties of the brake disc, for example the variance of a thickness of the brake disc and other geometric variables that can be calculated from these measured values, in particular at three different measuring points. For example, the thickness of the brake disc at this measuring point can be calculated from the two distance values measured in opposite directions to the two flat sides of the brake disc. The above description of the method is also to be understood as meaning that when the first distance sensor is pivoted to the first measuring point or the further measuring points, the second distance sensor is always also moved.

Further advantageous embodiments of the invention emerge from the following description of the figures and the dependent subclaims.

Show it:

1 shows an exemplary embodiment of a device in a perspective view,

2 shows part of the device according to FIG. 1,

3 shows a schematic representation for determining a positional deviation, Fig. 4 is a schematic representation of a sequence of the method for determining properties of a brake disc, and

Fig. 5 shows an exemplary representation of a brake disc with exemplary measuring circles and measuring points.

In the various figures of the drawing, the same parts are always provided with the same reference numbers.

The following description claims that the invention is not limited to the exemplary embodiments and not to all or several features of the combinations of features described, but rather each individual partial feature of the/each exemplary embodiment is also detached from all other partial features described in connection therewith also in combination with any features of another exemplary embodiment of importance for the subject matter of the invention.

Fig. 1 shows an exemplary embodiment of a device 1 for determining properties, for example a flat runout of a brake disk 2, an angular position of the brake disk 2 relative to a mounting surface of a floating caliper seat 4 or the variance of the thickness of the brake disk 2. Fig. 1 shows the device 1 in one perspective view. Fig. 2 shows part of the device 1 according to Fig. 1, also in a perspective view.

According to Fig. 1, the device 1 has at least one disk interface 3. The disk interface 3 is aligned essentially horizontally, so that the brake disk 2 can be placed flat. The disk interface 3 can be rotated at least partially about a rotation axis Z by a disk drive means 3a, here an electric motor, in any case in such a way that a brake disk 2 can be rotated in the assembled state according to Fig. 1. Furthermore, the device 1 has at least one floating caliper interface 4. The floating caliper interface 4 is located with its mounting surface in an imaginary plane F - see also Fig. 2. The device 1 also has a first distance sensor 5, which is arranged such that in the illustrated state of use it is aligned with a first flat side 2a of the brake disc 2. The first flat side 2a of the brake disc 2 is aligned in the direction of a wheel carrier 7 on which the brake disc 2 is mounted.

The floating saddle interface 4 is, as shown, designed to be connected to a floating saddle receptacle 6 of the wheel carrier 7. The floating caliper holder 6 is used in a vehicle - not shown - to attach a floating caliper with brake pads, which act on the brake disc 2 during operation to achieve a braking force. The floating saddle receptacle 6 of the wheel carrier 7 can be attached to the floating saddle interface 4 using screws 4a. The plane at which the floating saddle receptacle 6 rests on the floating saddle interface 4 or its mounting surface essentially corresponds to the plane F.

In order to prevent movement of the wheel carrier 7 during a measurement, the device 1 in the exemplary embodiment according to FIG. 1 has a counterholder 13. When mounted for a measurement, the wheel carrier 7 is attached to the counterholder 13, for example clamped or screwed. The device 1 has, for example, a base frame 14, here essentially in the form of a table. The counterholder 13 is screwed to the base frame 14.

1 and 2, the device 1 also has a second distance sensor 8, which is arranged for measurement in a direction opposite to the first distance sensor 5. When a brake disc 2 is mounted, the second distance sensor 8 is aligned with a second flat side 2b of the brake disc 2. The first distance sensor 5 and the second distance sensor 8 are arranged coaxially on an imaginary, common axis X. The first distance sensor 5 and the second distance sensor 8 are movable relative to the floating saddle interface 4 of the device 1, here pivotable, held on the device 1.

In order to pivot the distance sensors 5, 8, the device 1 in this exemplary embodiment has a sensor arm 10 held on a base frame 9. The sensor arm 10 has an arm base 10a and a first web 10b, which extends essentially orthogonally to the arm base 10a, and a further second web 10c, which extends substantially orthogonally to the arm base 10a. The first distance sensor 5 is arranged in an end region of the first web 10b that is remote from the arm base 10a and the second distance sensor 8 is arranged in an end region of the second web 10c that is remote from the arm base 10a.

The sensor arm 10, in particular the arm base 10a, is rotatably mounted about an axis of rotation A in the base frame 9, according to the double arrows in FIGS. 1 and 2. The axis of rotation A is spaced from the two distance sensors 5, 8, in particular from the common axis X corresponds, can be pivoted or rotated.

Due to the flexible mobility of the distance sensors 5, 8, measurements can therefore be carried out at different measuring points M1, M2, M3 on a flat side 2a, 2b of the brake disc 2 with only one distance sensor 5, 8 per flat side 2a, 2b.

In order to be able to rotate the sensor arm 10, in particular the arm base 10a, preferably with a control device of the device 1, the device 1 in this exemplary embodiment has a drive means 12 designed as a servomotor. The drive means 12 is attached to the base frame 9 with a mounting flange 11. The drive means 12 can be controlled by a control device of the device 1 in such a way that the distance sensors 5, 8 are in the desired form. for example in the form of partial circles 15, over which the flat sides 2a, 2b of the brake disc 2 can be pivoted.

In addition to pivoting the distance sensors 5, 8, it is advantageously provided that the control device of the device 1 rotates the disk interface 3 in such a way, for example in steps of approximately 10°, that the partial circles 15 on which the measuring points lie at least partially overlap. However, it is also intended to arrange the partial circles 15 on which the measuring points lie in such a way that they do not overlap. It is particularly preferred that a measurement is carried out at three measuring points M1, M2, M3 per pitch circle 15 on four pitch circles 15 offset from one another at an angle of approximately 90°. The three measuring points M1, M2, M3 on a pitch circle 15 preferably form a triangle, see e.g. B. Fig. 1 and Fig. 5.

The partial circles 15, along which the distance sensors 5, 8 are pivoted for a measurement, are shown as examples in FIGS. 1 and 5. Fig. 5 shows an example of the first flat side 2a of a brake disc 2 with partial circles 15 and measuring points M1, M2, M3 shown only for clarity. For example, there are three measuring points M1, M2, M3 on a pitch circle 15. For each pitch circle 15, the brake disc 2 has been rotated, for example by means of the disc drive means 3a. According to FIGS. 1 and 5, the measuring points M2 and M3 lie, for example, on a radius R which is approximately 10 mm away from an outer edge of the brake disc 2. At the measuring points M2 and M3, when the brake disk 2 rotates, for example through 360°, measured values for determining the axial run-out of the brake disk 2 can be determined.

Fig. 3 shows schematically how a positional deviation of the brake disc 2 to the mounting surface of the floating caliper interface 4 - see Fig. 1 - or to the floating caliper receptacle 6 is determined. In the assembled state, the mounting surface of the floating saddle interface 4 lies essentially in a plane with the floating saddle interface or the plane F. The device 1 can be calibrated either by measurements with a setup master disk (not shown). or preferably by measuring the device once - as described above. In the case of a one-off measurement, the measured deviations can only be checked during operation using a test element. For example, if distance values to the distance sensor 5 are determined at three measuring points M1, M2, M3 by the distance sensor 5 arranged on this flat side 2a of the brake disk 2, a positional deviation, for example shown as an angle a, of the brake disk 2 relative to the plane F can be calculated. This is possible because the distances of the distance sensor 5 or the distances of a reference point on the web 10b to the plane F in different pivoting positions are known from the measurement of the device 1 carried out at the beginning. The calculation is then carried out - as described - taking into account the offset values determined during calibration.

4 shows schematically a sequence of the method for determining properties of a brake disc 2. The method 100 includes moving 101 of the distance sensor 5 relative to the floating caliper interface 4 to a first measuring point M1 and carrying out 102 a measurement at the first measuring point M1. The method 100 can be carried out repeatedly to measure at the measuring points M2 and M3.

The invention is not limited to the exemplary embodiments shown and described, but also includes all embodiments that have the same effect within the meaning of the invention. It is expressly emphasized that the exemplary embodiments are not limited to all features in combination; rather, each individual sub-feature can have an inventive significance in itself, even independently of all other sub-features. Furthermore, the invention has not yet been limited to the combination of features defined in claim 1, but can also be defined by any other combination of certain features of all of the individual features disclosed overall. This means that, in principle, practically every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. Reference character list

1 device

2 brake disc

2a first flat side of 2

2b second flat side of 2

3 disc interface

3a disc drive means

4 fist saddle interface

4a screws

5 first distance sensor

6 fist saddle mount

7 wheel carrier

8 second distance sensor

9 base frames

10 sensor arm

10a arm base

10b first bridge

10c second bridge

11 mounting flange

12 means of propulsion

13 Counterholder

14 base frame

15 pitch circle

100 procedures

101 Move

102 Perform

F plane of the fist saddle interface

A rotation axis Z rotation axis of 3

X Common axis a Angle

M1 measuring point

M2 measuring point

M3 measuring point

R radius

Claims

Expectations

1 . Device (1) for determining properties of a brake disc (2), comprising at least one disc interface (3), at least one floating caliper interface (4) and at least one first distance sensor (5), the disc interface (3) being designed to interact with a brake disc (2 ) is provided, wherein the floating saddle interface (4) is designed for connection to a floating saddle receptacle (6) of a wheel carrier (7), characterized in that the first distance sensor (5) is held movable relative to the floating saddle interface (4).

2. Device (1) according to claim 1, characterized in that the first distance sensor (5) is held rotatably about a rotation axis (A) spaced from the first distance sensor (5).

3. Device (1) according to claim 2, characterized in that the first distance sensor (5) is held movable parallel to the rotation object (A).

4. Device (1) according to one of claims 1 to 3, characterized in that the first distance sensor (5) is translationally movable, preferably translationally movable towards and away from an axis of rotation (Z) of the disk interface (3). Device (1) according to one of claims 1 to 4, characterized in that at least one second distance sensor (8) is present, and that the first distance sensor (5) and the second distance sensor (8) are movable relative to the floating saddle interface (4), can be moved in particular in two parallel, imaginary planes. Device (1) according to claim 5, characterized in that the first distance sensor (5) and the second distance sensor (8) are aligned for measurement in mutually opposite directions, in particular coaxially on a common axis (X). Device (1) according to one of claims 1 to 6, characterized in that the disk interface (3) is aligned essentially horizontally, in particular that the disk interface (3) can be rotated by at least one disk drive means (3a). Device (1) according to one of claims 1 to 7, characterized in that at least one sensor arm (10) is present, that the sensor arm (10) has an arm base (10a) and at least one first extending essentially orthogonally to the arm base (10a). Has web (10b), and that the first distance sensor (5) is arranged on the first web (10b). Device (1) according to claim 8, characterized in that a second web (10c) extending orthogonally to the arm base (10a) is present, and that a second distance sensor (8) is arranged on the second web (10c). Device (1) according to claim 8 or 9, characterized in that the sensor arm (10) is held rotatable about an axis of rotation (A) running through the arm base (10a), in particular that the sensor arm (10) is rotatable via a drive means (12). is, in particular that the drive means (12) has at least one servo motor and at least one transmission means, for example at least one drive belt, at least one drive chain, at least one gear and / or at least one gear. Device (1) according to one of claims 1 to 10, characterized in that at least one control device is present and that the control device is designed and set up to move the first distance sensor (5) in partial circles (15). Device (1) according to one of claims 1 to 11, characterized in that at least one control device is present, and that the control device is set up and designed to dynamically move at least the first distance sensor (5) during a measurement or at least the first distance sensor (5) to move to at least one predetermined measuring position (M1, M2, M3) and to hold it at the respective measuring position (M1, M2, M3) at least for the duration of the measurement. Device (1) according to one of claims 1 to 12, characterized in that at least one control device is present, and that the control device is set up and designed to move at least the first distance sensor (5) to at least three different measuring positions (M1, M2, M3 ) to carry out measurements, in particular to hold it at the respective measuring position (M1, M2, M3) at least for the duration of a measurement. Method (100) for determining properties of a brake disc (2), with a device (1), in particular according to one of claims 1 to 13, wherein the device (1) has at least one disc interface (3), at least one floating caliper interface (4) and has at least one first distance sensor (5), wherein the disc interface (3) is provided for cooperation with the brake disc (2), and wherein the floating caliper interface (4) is designed for connection to a floating caliper receptacle (6) of a wheel carrier (7), thereby characterized in that at least the following process steps are included:

Moving (101) at least the first distance sensor (5) relative to the floating saddle interface (4) to a first measuring point (M1), carrying out (102) at least one measurement at the first measuring point (M1). Method (100) according to claim 14, characterized in that at least the following method steps are also included: moving (101) at least the first distance sensor (5) relative to the floating saddle interface (4) to a second measuring point (M2), carrying out (102) at least one Measurement at the second measuring point (M2), in particular

Moving (101) at least the first distance sensor (5) relative to the floating saddle interface (4) to a third measuring point (M3), carrying out (102) at least one measurement at the third measuring point (M3). Method (100) according to claim 14 or 15, characterized in that moving (101) and carrying out (102) a measurement takes place dynamically, so that a measurement at a measuring point (M1, M2, M3) without interrupting the movement (101 ) takes place, or that the movement (101) to carry out (102) a measurement at a measuring point (M1, M2, M3) is at least temporarily interrupted.