Apparatus and method for determining properties of a brake disc

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

[0001] AuE Kassel GmbH, Heinrich-Hertz-Straße 52, 34123 Kassel

[0002] ZF Friedrichshafen AG, Löwentaler Straße 20, 88046 Friedrichshafen

[0003] “Device and method for determining properties of a brake disc”

[0004] 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 one mounted on a wheel carrier. Furthermore, the device has at least one floating caliper interface and at least one distance sensor. The floating caliper interface is designed for connection to a floating caliper mount of a wheel carrier.

[0005] A vehicle's wheel carrier serves, among other things, to attach a wheel to a vehicle axle. The brake disc, which rotates during operation, is usually also mounted on the wheel carrier. The wheel carrier and brake disc unit is often pre-assembled and then attached together to a vehicle axle. Positional or geometric deviations resulting from the manufacture and / or assembly of the individual components of the wheel carrier or the manufacture of the brake disc can, when assembled, lead to insufficiently precise positioning of the brake disc relative to the floating caliper and thus also relative to the brake pads. This can lead to unwanted vibrations or noise while driving or during braking.High quality demands from vehicle customers, as well as new requirements for smooth running resulting from the reduced noise environment in electromobility, make it necessary to maintain the precise concentricity and positioning of rotating components, especially brake discs, within a specific tolerance range. The invention is therefore based on the object of specifying a device and a method for determining the properties of a brake disc, with which the properties of a brake disc, in particular a brake disc mounted on a wheel carrier, that influence the concentricity properties can be verified.

[0006] The object mentioned at the outset 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 fist caliper interface.

[0007] In order to be able to determine geometric and / or positional properties that influence the concentricity of the brake disc, in particular of a brake disc mounted on a wheel carrier, with sufficient accuracy, a measurement of distances between a first flat side of a brake disc and the calibrated device can be carried out, for example. Based on a measurement of distances at at least three measuring points on at least two different radii of the brake disc, a positional deviation of the brake disc, for example an angular deviation relative to a reference surface, can be determined. A radial runout of the brake disc can be determined, for example, by measuring at at least one measuring point on a radius of the brake disc during a 360° rotation of the brake disc.

[0008] According to the invention, at least one first distance sensor is held on the device to carry out a measurement at least on a first flat side of the brake disc, said first distance sensor being movable relative to the floating caliper interface of the device. The first distance sensor is held in particular in such a way that, when a brake disc is mounted on the device, it can be moved to different radii of the brake disc. Preferably, exactly one single distance sensor is provided for one flat side of the brake disc. The one distance sensor is arranged in particular in such a way that, when the brake disc is arranged in the device, it is aligned with the first flat side - for example, an upper or a lower flat side - of the brake disc.The at least one distance sensor is preferably designed and arranged such that a distance between the distance sensor and a brake disc that can be arranged in the device can be determined.

[0009] For example, it is also provided that a plurality of distance sensors are present, and that the distance sensors are arranged so as to be movable relative to the floating caliper interface. The distance sensors are arranged in particular such 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.

[0010] 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 perform measurements. It is preferably provided that at least one measurement, in particular a distance, is performed at each of the measuring points. Alternatively, it is provided, for example, that at least one measurement, in particular a distance, is performed during a movement of the first distance sensor.

[0011] The distance sensor is preferably movable, in particular pivotable, in an imaginary plane. The floating caliper interface has, in particular, at least one mounting surface for interacting with a floating caliper mount of a wheel carrier. In particular, at least two recesses with an internal thread are provided in the mounting surface, so that the floating caliper mount can be screwed to the floating caliper interface. The floating caliper interface is preferably connected to the floating caliper mount in the same way as a floating caliper when mounted in a vehicle. Advantageously, the floating caliper interface, in particular the mounting surface, spans an imaginary plane F, and 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 is determined during the calibration of the device, as explained below, and is taken into account in calculations using the measured values.

[0012] In order to determine properties of the brake disc, e.g., axial runout, an angular position of the brake disc relative to a mounting surface for a floating caliper seat, or the variance in the thickness of the brake disc, one distance sensor is used, as described above, to measure a distance at three different measuring points on at least two different radii of the brake disc, or the brake disc is rotated during a continuous measurement with the distance sensor. From the measured values ​​obtained, the aforementioned properties of the brake disc can be calculated, for example, in particular using 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 configured such that it can determine at least the axial runout and / or a positional deviation, in particular an angular deviation to the mounting surface of the floating caliper interface, from the distance measurement values ​​at three different measuring points on the flat side of the brake disc.

[0013] 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 is parallel to a corresponding mounting surface of the floating caliper holder when assembled, distance measurements are determined at different measuring points as described. The relationship between a first distance sensor or a second distance sensor and the imaginary plane F of the floating caliper interface is calibrated, for example, using a measurement on a measured set-up master disc. The measurement on the set-up master disc provides the offset measurements so that the subsequent measurements can be mathematically related to the imaginary plane F of the floating caliper interface. As an alternative to using the set-up master disc, the device is measured once and the determined distances between the components of the device are taken into account in calculations.

[0014] The distance sensor is designed, for example, as an optical sensor, capacitive sensor or acoustic sensor.

[0015] Because the distance sensor is 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 variety of properties of the brake disc, particularly of 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.

[0016] According to a first embodiment of the device, it has proven particularly advantageous if the distance sensor is mounted so as to be rotatable about a rotation axis A that is spaced apart from the distance sensor. The distance sensor can be pivoted, for example, via 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 disc interface is also designed to be rotatable so that the brake disc can also be rotated during a measurement or between two measurements. By rotating the distance sensor and rotating 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 on a radius for at least one measurement and the brake disc is rotated, preferably rotated by at least 360°.

[0017] In particular, it is also provided that the rotation of the distance sensor and / or the rotation of the brake disc is performed manually, for example, by a user. Preferably, the disc interface is designed for manual rotation by a user. Advantageously, the disc interface has a grip ring or a grip disc for this purpose.

[0018] For example, it is provided that the device has at least one fixing device, and that the distance sensor can be fixed by the fixing device in at least one, preferably at least two or at least three, rotational or pivoting positions, i.e., at specific measuring points. In particular, it is provided that the fixing device is automatically fixed, e.g., locked, in at least three pivoting positions.

[0019] For example, the fixing device has at least one dial to allow the setting of rotation or pivot angles. It is also intended that the fixing device enables continuous fixation of the distance sensor in any pivot position.

[0020] For a pivoting or rotating distance sensor, the measurement accuracy depends significantly on the perpendicularity of the mounting surface of the floating caliper interface, e.g., plane F, to the rotation axis A. Even with very precise manufacturing, a certain perpendicularity tolerance is unavoidable. For example, a bearing for rotating the distance sensor around the rotation axis A is designed with preload to eliminate play and achieve high rigidity. This results in high repeatability.

[0021] By using only a single distance sensor per flat side of the brake disc, it is advantageous to dispense with the use of a setup master disc for calibration. 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 target of the measurement and only the difference between the measured values ​​at the three measuring points is important, it is sufficient to measure the device once before it is used. The distance sensor is preferably always pivoted by the same angle so that determining 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 caliper interface.

[0022] Preferably, the measurement values ​​of the device can be verified during operation using a test element. The test element is mounted in the device and checks whether the distances or deviations initially measured during the measurement are still unchanged. Eliminating the use of a master set-up wheel is advantageous because the measurement errors that arise when measuring the master set-up wheel can be eliminated as an additional uncertainty.

[0023] The distance of the distance sensor from the rotation axis A determines the radius of the circle or a partial circle in which the distance sensor can rotate. Preferably, the distance of the distance sensor from the rotation axis A is also adjustable. For example, the distance of the distance sensor from the rotation axis A can be adjusted in preset steps or continuously.

[0024] In particular, in order to be able to adjust the device for use with brake discs of different thicknesses or with brake disc chambers of different heights, a further embodiment provides that the distance sensor is mounted so that it can move parallel to the rotation axis A. Preferably, the distance sensor is mounted so that it can move in preset steps or continuously parallel to the rotation axis A. This allows the distance of the distance sensor to be adjusted from the first flat side of the brake disc, and thus adapts the device to different brake disc types.

[0025] A further embodiment of the device provides that at least the first distance sensor is movable in translation, in particular relative to the floating caliper interface. For example, the device has at least one carriage for this purpose, 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 towards and away from a rotation axis Z of the disc interface. For example, it is provided that the distance sensor is manually movable in translation. Preferably, certain positions are provided, in particular along a rail, at which the distance sensor can be fixed using a fixing means.Alternatively, it is also provided, in particular, that the first distance sensor is capable of translational movement in an automated manner by means of a drive means. Preferably, the drive means comprises a linear motor or a motor with a gearwheel or a gear and a toothed rail.

[0026] Due to the translational mobility of at least the first distance sensor, any radius on a brake disc mountable in the device can be reached with the distance sensor. In combination with a rotation of the brake disc, any point on the brake disc can be reached for measurement using the distance sensor.

[0027] In particular, the device is designed such that at least the first distance sensor is mounted so that it can be rotated about a rotation axis A spaced apart from the distance sensor and is also movable in translation. This design further increases the flexibility of the device for use with different brake discs and wheel carriers.

[0028] The range of properties that can be determined with the device can advantageously be expanded by providing, according to a further embodiment, that at least two distance sensors are present and that both distance sensors are held so as to be movable relative to the floating caliper 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 disc when the brake disc is arranged at the disc interface. A second distance sensor is advantageously arranged such that it is directed towards a second flat side of the brake disc when the brake disc is arranged at the disc interface.

[0029] Preferably, the two distance sensors are arranged coaxially on a common axis in opposite measuring directions. This allows the two distance sensors to always be moved parallel to each other, with the first distance sensor configured to measure on a first flat side of the brake disc and the second distance sensor configured to measure on a second flat side of the brake disc.

[0030] By measuring the distances on the opposite flat sides of the brake disc, for example, the variation in the thickness of the brake disc can be calculated based on the measured values ​​obtained by the two distance sensors. Furthermore, the measured values ​​of both distance sensors can be related to the imaginary plane F of the floating caliper interface in order to calculate the relative deviations of each of the flat sides of the brake disc from this plane. It is advantageous for the two distance sensors to be movable in two imaginary, parallel planes.

[0031] For example, both distance sensors are held jointly so as to be pivotable about a rotational axis A arranged at a distance from the two distance sensors, such 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 translationally, 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 translationally parallel to one another - the first distance sensor is directed towards the first flat side of the brake disc and the second distance sensor is directed towards the second flat side of the brake disc. Both distance sensors are preferably held so as to be movable translationally in the radial direction relative to a brake disc that can be arranged in the device.Preferably, both distance sensors are mounted on at least one carriage that is movable along at least one rail. Preferably, the orientation and / or height of the rail is variable.

[0032] In particular, it is provided that at least one distance sensor—the first distance sensor or the second distance sensor—is movable parallel to the rotation axis A. Advantageously, at least the distance sensor aligned with the second—lower—flat side of the brake disc is displaceable along the rotation axis A. Preferably, it is provided that both distance sensors are movable relative to the rotation axis A, in particular, they are also held movable relative to one another along the rotation axis A. However, it is particularly advantageous that the distance between the distance sensors is fixed.

[0033] According to a further embodiment of the device, the arrangement of a wheel carrier in the device for performing measurements can be advantageously simplified by aligning the disc interface substantially 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, in particular screwed, to the disc interface.

[0034] Preferably, the disc interface is rotatable by at least one disc drive means. For example, a drive motor, in particular a servomotor, is provided, with which the disc interface and thus the brake disc can be rotated, in particular in two directions. Advantageously, the drive of the disc interface is designed such that the disc interface can be rotated in predefined step increments. According to a further embodiment, the arrangement of the distance sensors on the device can advantageously be designed in that at least one sensor arm is provided, and that the sensor arm has an arm base and at least one web extending substantially orthogonally to the arm base. The distance sensor is arranged on the web.

[0035] Preferably, the rotation axis A, around which the distance sensor is rotatable, runs longitudinally through the sensor arm or the arm base. The distance sensor is arranged in the end region of the web extending orthogonally to the arm base, so that when the sensor arm is rotated, the web can be moved substantially parallel to a flat side of a brake disc that can be arranged in the device. The distance sensor is mounted on the web and moves together with the web.

[0036] It is particularly preferred that a second web extending orthogonally to the arm base is provided 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 substantially 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 webs for measuring 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 a second flat side of a brake disc that can be arranged in the device, and the distance sensors are moved in partial circles over the flat sides of the brake disc.

[0037] For example, it is provided that the sensor arm with the first web and the second web is mounted on a carriage that can be moved along a rail—manually or automatically. This allows the first distance sensor and the second distance sensor to be mounted for both rotation and translation.

[0038] According to a further embodiment of the device, it has proven advantageous if the rotatably mounted sensor arm, in particular the sensor arm rotatable about an axis A running through the arm base, is rotatable via a drive means. The drive means can be controlled, for example, by a control device of the device, which in particular also handles the processing of the measured values. The drive means has, for example, at least one servomotor with which the sensor arm can be moved directly. It is also provided that the drive means further has at least one transmission means for transmitting 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 transmission.

[0039] As already described above, using exactly one distance sensor per flat side of the brake disc eliminates the need for a master setup disc. For this purpose, the fixture is measured once. For example, during this measurement, the distances – in a direction parallel to the fixture's rotation axis A – are determined in at least three fixture orientations, i.e., at at least three different pivot positions – measurement positions – between the mounting surface of the floating caliper interface and a reference point on the distance sensor or on a surface of the first web.

[0040] For example, the three measuring positions are a center position ZO, a right position ZR, and a left position ZL. The center position is preferably considered the zero position during measurement. 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 the properties of the brake disc. These deviations correspond to the error that can be caused by only approximate perpendicularity between the mounting surface and the rotation axis A - or by incomplete parallelism of the plane F of the mounting surface and the plane in which the distance sensor(s) is / are pivoted. The distance in the zero position and in the two other positions does not usually change during operation, so the use of a setup master disc is not necessary.

[0041] A change in the distances can occur, for example, if mechanical influences are applied to the device. To rule out any changes to the device, measurements are taken at regular intervals using a test element. These measurements can confirm the deviations identified during the measurement or determine that the system requires overhaul.

[0042] An advantageous embodiment of the device provides that the device comprises at least one control device, and that the control device is designed and configured to move the distance sensor in partial circles. The control device can, for example, control the drive means of the device, in particular the servo motor, such that the distance sensors can be moved to predetermined measuring points on the flat sides of the brake disc, or such that the distance sensors execute specific movement profiles parallel to the flat sides of the brake disc. The drive patterns required to cover partial circles are stored, for example, in a memory of the control device.

[0043] It is advantageously provided that the control device is designed and configured 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 at least one measurement. In particular, it is also provided that the control device is designed and configured such that at least one measurement is carried out with the distance sensors continuously during the movement of the distance sensors or during a continuous movement to specific 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 properties of the brake disc or its position relative to the wheel carrier.

[0044] However, it is particularly preferred that the control device is configured and designed to temporarily pivot the distance sensor or the distance sensors to discrete measuring points and to hold the measurement there at least for the duration.

[0045] The aforementioned object is further achieved 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 described embodiments. 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 caliper interface is designed for connection to a floating caliper mount of a wheel carrier. The method is characterized in that it comprises at least the following method steps:

[0046] Moving at least the first distance sensor relative to the floating caliper interface to a first measuring point, performing at least one measurement at the first measuring point. The at least one distance sensor is consequently moved relative to the floating caliper 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 performed 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 performed while the brake disc is rotated, in particular by at least 360°. In this way, for example, the axial runout of a flat side can be determined.Preferably, the axial runout is determined simultaneously on both flat sides of the brake disc by measuring with two distance sensors arranged opposite each other.

[0047] It is also provided that the distance sensor is moved translationally during the implementation of the method or that the distance sensor is pivoted and moved translationally.

[0048] According to a further embodiment of the method, after performing 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 perform at least one measurement there. In particular, it is further provided that after performing 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 perform a measurement there.

[0049] A further embodiment of the method advantageously provides for the movement of the distance sensor and the measurement to be carried out dynamically, so that a measurement is taken at a specific measuring point without interrupting the movement. This significantly reduces process times. Alternatively, the movement is temporarily interrupted at one measuring point to perform the measurement, at least for the duration of the measurement. The movement is then continued, in particular to a second or third measuring point.

[0050] The method is particularly suitable for implementation with two distance sensors that are aligned coaxially with each other in opposite directions for measurement on a common axis. Both distance sensors are therefore moved parallel to each other, in particular pivoted, in order to perform a measurement on both flat sides of a brake disc simultaneously. The measured values ​​obtained simultaneously from a first distance sensor and a second distance sensor can also be used to determine other 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. From the two distance values ​​measured in opposite directions to the two flat sides of the brake disc, the thickness of the brake disc at this measuring point can be calculated, for example.The above description of the method is therefore also to be understood in such a way 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.

[0051] Further advantageous embodiments of the invention emerge from the following description of the figures and the dependent subclaims.

[0052] They show:

[0053] Fig. 1 shows an embodiment of a device in perspective view,

[0054] Fig. 2 a part of the device according to Fig. 1 ,

[0055] Fig. 3 is 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

[0056] Fig. 5 shows an exemplary representation of a brake disc with exemplary measuring circles and measuring points.

[0057] In the various figures of the drawing, identical parts are always provided with the same reference symbols.

[0058] With regard to the following description, it is claimed that the invention is not limited to the exemplary embodiments and not to all or several features of described combinations of features, but rather each individual partial feature of the / each exemplary embodiment is also important for the subject matter of the invention, even independently of all other partial features described in connection therewith, and also in combination with any features of another exemplary embodiment.

[0059] Fig. 1 shows an embodiment of a device 1 for determining properties, for example, the axial runout of a brake disc 2, the angular position of the brake disc 2 relative to a mounting surface of a floating caliper seat 4, or the variance of the thickness of the brake disc 2. Fig. 1 shows the device 1 in a perspective view. Fig. 2 shows a part of the device 1 according to Fig. 1, also in a perspective view.

[0060] According to Fig. 1, the device 1 has at least one disc interface 3. The disc interface 3 is oriented substantially horizontally, so that the brake disc 2 can be placed in a flat position. The disc interface 3 is at least partially rotatable about a rotation axis Z by a disc drive means 3a, here an electric motor, in any case such that a brake disc 2 is rotatable in the mounted state according to Fig. 1. Furthermore, the device 1 has at least one floating caliper interface 4. The floating caliper interface 4 lies 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 use state, 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.

[0061] The floating caliper interface 4 is, as shown, designed for connection to a floating caliper mount 6 of the wheel carrier 7. The floating caliper mount 6 serves, in a vehicle (not shown), for attaching a floating caliper with brake pads that act on the brake disc 2 during operation to generate a braking force. The floating caliper mount 6 of the wheel carrier 7 can be fastened to the floating caliper interface 4 by means of screws 4a. The plane at which the floating caliper mount 6 rests on the floating caliper interface 4 or its mounting surface essentially corresponds to plane F.

[0062] To prevent movement of the wheel carrier 7 during a measurement, the device 1 in the embodiment shown in 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.

[0063] According to Fig. 1 and Fig. 2, the device 1 further comprises a second distance sensor 8, which is arranged for measuring in a direction opposite to the first distance sensor 5. In the mounted state of a brake disc 2, 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 held on the device 1 so as to be movable, here pivotable, relative to the floating caliper interface 4 of the device 1.

[0064] To pivot the distance sensors 5, 8, the device 1 in this 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 extending substantially orthogonally to the arm base 10a, as well as a further second web 10c extending substantially orthogonally to the arm base 10a. The first distance sensor 5 is arranged in an end region of the first web 10b remote from the arm base 10a, and the second distance sensor 8 is arranged in an end region of the second web 10c remote from the arm base 10a.

[0065] The sensor arm 10, in particular the arm base 10a, is mounted in the base frame 9 for rotation about a rotation axis A, as indicated by the double arrows in Figs. 1 and 2. The rotation axis A is spaced from the two distance sensors 5, 8, in particular from the common axis X, so that the distance sensors 5, 8 can be pivoted or rotated on a circular path, the radius of which corresponds to the distance of the rotation axis A from the axis X, when the arm base 10a rotates about the rotation axis A.

[0066] Due to the flexible mobility of the distance sensors 5, 8, measurements can 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.

[0067] 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 embodiment has a drive means 12 designed as a servomotor. The drive means 12 is attached to the base frame 9 by a mounting flange 11. The drive means 12 can be controlled by a control device of the device 1 such that the distance sensors 5, 8 can be pivoted in the desired shape, for example in the form of partial circles 15, over the flat sides 2a, 2b of the brake disc 2.

[0068] 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 provided that the partial circles 15 on which the measuring points lie are arranged such that they do not overlap. Particularly preferably, it is provided that a measurement is carried out at three measuring points M1, M2, M3 per partial circle 15 on four partial circles 15 offset from one another at an angle of approximately 90°. The three measuring points M1, M2, M3 on a partial circle 15 preferably span a triangle, see, for example, Fig. 1 and Fig. 5.

[0069] The partial circles 15 along which the distance sensors 5, 8 are pivoted for a measurement are shown as examples in Fig. 1 and Fig. 5. Fig. 5 shows, as an example, the first flat side 2a of a brake disc 2 with partial circles 15 and measuring points M1, M2, M3 shown only for clarification. For example, three measuring points M1, M2, M3 are located on a partial circle 15. For each partial circle 15, the brake disc 2 has been rotated, for example by means of the disc drive means 3a. The measuring points M2 and M3 are located, for example, on a radius R according to Fig. 1 and Fig. 5, which is approximately 10 mm from an outer edge of the brake disc 2. At the measuring points M2 and M3, when the brake disc 2 is rotated, for example by 360°, measured values ​​for determining the axial runout of the brake disc 2 can be determined.

[0070] Fig. 3 shows schematically how a positional deviation of the brake disc 2 relative to the mounting surface of the floating caliper interface 4 - see Fig. 1 - or to the floating caliper mount 6 is determined. In the mounted state, the mounting surface of the floating caliper interface 4 lies essentially in the same plane as the floating caliper interface or plane F. Calibration of the device 1 can be carried out either by measurements with a setup master disc (not shown) or, preferably, by a one-time measurement of the device - as described above. With a one-time measurement, only a check of the measured deviations with a test element can be carried out during operation.If, for example, 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 disc 2, a positional deviation, represented, for example, as angle α, of the brake disc 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 various 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.

[0071] Fig. 4 schematically shows a sequence of the method for determining properties of a brake disc 2. The method 100 comprises moving 101 the distance sensor 5 relative to the floating caliper interface 4 to a first measuring point M1 and performing 102 a measurement at the first measuring point M1. The method 100 can be repeated similarly for measurements at the measuring points M2 and M3.

[0072] The invention is not limited to the illustrated and described embodiments, but also encompasses all equivalent embodiments within the meaning of the invention. It is expressly emphasized that the embodiments are not limited to all features in combination; rather, each individual feature can also have an inventive significance in isolation from all other features. Furthermore, the invention is not yet limited to the combination of features defined in claim 1, but can also be defined by any other combination of specific features of all 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.

[0073] 1 device

[0074] 2 brake discs

[0075] 2a first flat side of 2

[0076] 2b second flat side of 2

[0077] 3 Disc interface

[0078] 3a Disc drive means

[0079] 4 Fist saddle interface

[0080] 4a Screws

[0081] 5 first distance sensor

[0082] 6 floating saddle mount

[0083] 7 wheel carriers

[0084] 8 second distance sensor

[0085] 9 base frames

[0086] 10 Sensor arm

[0087] 10a Arm base

[0088] 10b first bridge

[0089] 10c second bridge

[0090] 11 Mounting flange

[0091] 12 Propulsion means

[0092] 13 Counterholder

[0093] 14 Base frame

[0094] 15 pitch circle

[0095] 100 procedures

[0096] 101 Moving

[0097] 102 Implementation

[0098] F Level of the fist caliper interface

[0099] A Rotation axis Z Rotation axis of 3

[0100] X Common axis a Angle

[0101] M1 measuring point

[0102] M2 measuring point

[0103] M3 measuring point

[0104] R radius

Claims

Claims 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), wherein the disc interface (3) is provided for interaction with a brake disc (2), wherein the floating caliper interface (4) is designed for connection to a floating caliper mount (6) of a wheel carrier (7), characterized in that the first distance sensor (5) is held movable relative to the floating caliper 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 axis of rotation (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 a rotation axis (Z) of the disc 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 in that the first distance sensor (5) and the second distance sensor (8) are movable relative to the fist-caliper interface (4), in particular in two mutually 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 opposite directions to each other, 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 substantially horizontally, in particular that the disk interface (3) is rotatable 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 provided, that the sensor arm (10) has an arm base (10a) and at least one first web (10b) extending substantially orthogonally to the arm base (10a), 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 provided, 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 rotatably about a rotation axis (A) extending through the arm base (10a), in particular that the sensor arm (10) is rotatable via a drive means (12), in particular that the drive means (12) has at least one servomotor and at least one transmission means, for example at least one drive belt, at least one drive chain, at least one gearwheel 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 configured 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 provided, and in that the control device is set up and designed to move at least the first distance sensor (5) dynamically during a measurement or at least to move the first distance sensor (5) 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 provided, and in 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) for carrying out measurements. in particular, to hold the respective measuring position (M1, M2, M3) at least for the duration of a measurement. A method (100) for determining properties of a brake disc (2), comprising 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 at least one first distance sensor (5), wherein the disc interface (3) is provided for interaction with the brake disc (2), and wherein the floating caliper interface (4) is designed for connection to a floating caliper mount (6) of a wheel carrier (7), characterized in that at least the following method steps are included: Moving (101) at least the first distance sensor (5) relative to the caliper interface (4) to a first measuring point (M1), performing (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 further included: Moving (101) at least the first distance sensor (5) relative to the caliper interface (4) to a second measuring point (M2), performing (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 fist caliper 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 the movement (101) and the carrying out (102) of a measurement are carried out dynamically, so that a measurement is carried out at a measuring point (M1, M2, M3) without interruption of the movement (101), or that the movement (101) for carrying out (102) a measurement at a measuring point (M1, M2, M3) is at least temporarily interrupted.

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