Wheel brake device

Abstract

The invention relates to a wheel brake device (1) for a brake system of a motor vehicle, having a brake holder (2), a brake caliper (3) mounted displaceably on the brake holder (2), a drivable actuator (4), in particular an electric machine, connected to the brake caliper (3), a first brake lining (5) displaceable by means of the actuator (4), a second brake lining (6) displaceable by means of the brake caliper (3), in particular connected with the brake caliper (3), and a brake disc (7), wherein the brake linings (5, 6) are associated with different sides (10, 11) of the brake disc (7) and are mounted so as to be displaceable towards one another in order to produce a braking force. According to the invention, the wheel brake device (1) has at least one first path-reversing linkage (12), and the brake linings (5, 6) are coupled resiliently to one another by means of the linkage (12).

Description

[0001] R. 415567

[0002] - 1 -

[0003] Description

[0004] title

[0005] Wheel brake alignment

[0006] The invention relates to a wheel brake device for a braking system of a motor vehicle, comprising a brake holder, a brake caliper slidably mounted on the brake holder, a controllable actuator connected to the brake caliper, in particular an electric machine, a first brake pad slidable by means of the actuator, a second brake pad slidable by means of the brake caliper, in particular connected to the brake caliper, and a brake disc, wherein the brake pads are assigned to different sides of the brake disc and are slidably mounted towards each other in order to generate a braking force.

[0007] State of the art

[0008] From the prior art, wheel brake systems designed as floating caliper brakes are known, which can be actuated hydraulically or purely electromechanically. The floating brake caliper used, also called a "fist," typically surrounds the brake disc. To utilize the reaction force of the actuation triggered by the actuator for braking, the second brake pad is displaceable by the brake caliper or supported by it. When the first brake pad is moved towards the brake disc by the actuator, the second brake pad is also pressed against the brake disc by the reaction force of the actuation transmitted via the brake caliper. This type of coupling, however, is only a pressure coupling. During braking, the reaction force of the first brake pad, transmitted via the brake caliper, ensures that the brake caliper floats on the brake carrier when actuated by the floating guide.415567.

[0009] - 2 -

[0010] When the wheel brake system is disengaged, no braking torque should be applied. Therefore, after braking, the brake pads must be released from the brake disc. To do this, the brake caliper must be reset to ensure that both brake pads are no longer in contact with the brake disc. With hydraulic actuation, it is known to use a so-called quad ring with a rectangular cross-section as a sealing element for the first brake pad on a corresponding brake piston, because actively retracting the brake piston is not possible. The deformation that occurs when the brake piston is actuated pre-tensions the quad ring, causing the first brake pad to retract slightly with the piston.

[0011] With purely electromechanical actuation, it is possible to actively retract the first brake pad. In known wheel brake systems, the brake caliper with the second brake pad cannot be actively reset; however, the brake disc usually exhibits runout and wobbles slightly and / or is slightly tilted due to the elasticity of the wheel bearing, so that the brake pads are pushed away from the brake disc by the corresponding wobbling motion. Reliable operation of this mechanism is not guaranteed, so a certain residual drag torque may remain.

[0012] If the disc runout or tilt is sufficient, the brake pads are moved away from the brake disc; otherwise, they continue to rub against it. If the smooth movement of the brake caliper's floating guide is reduced, for example, due to contamination, the floating caliper brake typically retains some residual braking effect. Furthermore, it is generally desirable that the distance between each brake pad and the brake disc, the so-called brake pad clearance, is the same on both sides of the brake disc. This ensures minimal free play for the next application and thus allows both pads to contact the brake disc more quickly.

[0013] Disclosure of the invention R. 415567

[0014] - 3 -

[0015] The wheel brake device according to the invention, with the features of claim 1, is characterized in that the wheel brake device has at least one first reversing linkage mechanism, and that the brake pads are spring-elastically coupled to each other by means of the linkage mechanism. This creates an advantageous positive guidance or positive coupling of the two brake pads, which ensures that, in an unactuated state of the wheel brake device, an equally sized air gap exists between both brake pads and the brake disc, thus centering them and completely preventing any residual rubbing torque. The limitations of known wheel brake devices mentioned at the outset are therefore completely eliminated.The invention demonstrates that it is possible to bring the brake pads, directly or indirectly via the brake caliper, into a spring-elastic and thus soft constraint condition using a transmission system with spring coupling and / or elastic materials. This is possible because, unlike hydraulic actuation, electromechanical actuation allows the first brake pad to be actively moved away from the brake disc, rather than being pulled, thus generating the force required to move the floating caliper. This mechanism, implemented via the transmission system, ensures that the brake can be released even with older or dirty brake calipers. Because the forces involved are generally quite small, the mechanism only needs to transmit minimal forces and can therefore be small and lightweight. The spring coupling is advantageous because it elegantly compensates for inaccuracies and elastic deflection.The spring coupling ensures a rigid connection up to a predetermined force or preload, followed by a softer connection. This is achieved primarily through the use of a separate spring element and / or an elastic material in at least one of the coupling components. Thus, everything can be moved up to the predetermined force. Once the preload is exceeded, the spring element and / or the material is compressed, and the output of the coupling mechanism associated with the second brake pad no longer follows the input associated with the first brake pad. The second brake pad can be directly connected to the brake caliper, but this is not mandatory.

[0016] In particular, the second brake pad is only spring-loaded, for example by known pad springs, in the direction of the brake caliper. (See R. 415567)

[0017] - 4 -

[0018] If the linkage mechanism only moves the brake caliper, the second brake pad follows due to the spring tension. In this context, the reversal of movement means that the brake pads always have opposite displacement paths; that is, they are always moved in opposite directions by the linkage mechanism, either towards or away from each other. If the first brake pad is moved away from the brake disc by the actuator after braking, the linkage mechanism automatically moves the second brake pad away from the brake disc as well. Various mechanical solutions are conceivable for this. For example, the linkage mechanism may have a lever mechanism and / or a rack and pinion mechanism, or may be designed as such. The rack and pinion mechanism, in particular, has a gear as a pinion and two racks engaging with it, and is thus designed as a double rack and pinion mechanism.The racks are arranged parallel to each other and opposite each other with respect to the gear. The gear ensures that the racks always move by the same distance, but in opposite directions. All embodiments of the wheel brake device have in common that the movement of the first brake pad is transmitted, via the linkage, to the position of the brake caliper relative to the brake holder, which is preferably designed as a component fixed to a steering knuckle, or directly to the second brake pad in the opposite direction. The wheel brake device according to the invention is, in particular, a component of a motor vehicle's braking system, wherein the braking system preferably comprises a plurality of such wheel brake devices. The first brake pad is, in particular, an inner brake pad with respect to the motor vehicle, and the second brake pad is an outer brake pad and thus, when properly installed, a rim-side brake pad.The actuator, in particular an actuator housing, is preferably rigidly connected to the brake caliper. The brake holder is designed in particular to encompass the brake disc and hold the brake caliper via guide pins. The brake pads are supported in the brake holder in particular tangentially and / or radially, so that the brake holder absorbs the resulting braking forces and no lateral forces are transmitted to the brake caliper. R. 415567.

[0019] - 5 -

[0020] According to a preferred embodiment of the invention, the wheel brake device comprises at least one gear arrangement, in particular a spindle drive, and the first brake pad, in particular an actuating element connected to the first brake pad, is operatively connected to the actuator by means of the gear arrangement. The use of such a gear arrangement advantageously ensures that the brake pad can be moved with pinpoint accuracy by the actuator. Preferably, the gear arrangement is designed to convert a rotation into a translation, i.e., for example, a rotation of a rotor shaft of an actuator designed as an electric machine into a linear displacement of the brake pad, as in a spindle drive or ball screw drive.

[0021] In particular, the actuating element is designed as a brake piston. Using a brake piston also allows for a sealing function. Through the corresponding operative connection, the actuator is preferably designed to actively retract the brake pad from the brake disc, as described above, in order to establish an air gap as clearance.

[0022] It is particularly preferred that the first brake pad and / or the second brake pad are slidably mounted on the brake caliper bracket. This slidable mounting on the brake caliper bracket offers the advantage that the bracket provides advantageous guidance for the respective brake pad.

[0023] According to a preferred embodiment of the invention, the wheel brake assembly comprises at least one second linkage assembly, arranged at a distance from the first linkage assembly and, in particular, designed symmetrically to the first linkage assembly, and the brake pads are spring-elastically coupled to each other by means of the linkage assemblies. The use of at least two linkage assemblies advantageously ensures that the overall mechanical load is better distributed, and in particular symmetrically distributed. In particular, the wheel brake assembly comprises a plurality of linkage assemblies, which are arranged distributed, preferably at uniform distances from one another.

[0024] The coupling mechanism particularly preferably includes a lever or a gear which is attached to the brake holder, in particular to ensure a transverse movement to a respective R. 415567

[0025] - 6 -

[0026] The pivot axis is mounted on a rotatable bearing, aligned with the direction of movement of the brake pads. Using a suitable lever or gear offers the advantage that the brake caliper serves as a fixed point for the linkage mechanism, to which the linkage is functionally connected. The pivot point is therefore located on the brake caliper itself, allowing the lever or gear to rotate relative to the caliper but not to slide.

[0027] According to a preferred embodiment of the invention, the coupling mechanism comprises a first and a second rack, which are aligned parallel to each other and each engages with the gear. The first rack has a first end coupled to the first brake pad, and the second rack has a second end coupled to the second brake pad. The use of a corresponding rack mechanism advantageously ensures that the brake pads are functionally coupled to each other in reverse, as described above. When the first brake pad is moved, the movement is transmitted to the corresponding rack, the gear rotates, and the movement is transmitted via the gear to the other rack, so that the second brake pad is also forcibly moved in the opposite direction.

[0028] Particularly preferably, the lever has a first end coupled to the first brake pad and a second end coupled to the second brake pad, and the lever is rotatably mounted on the brake caliper, especially centrally, between the two ends. The use of such a lever mechanism also offers the advantage that the brake pads are functionally coupled to each other in reverse, as described above. When the first brake pad is moved, the movement is transferred to the lever, which rotates and is then transmitted via the lever to the second brake pad, so that the second brake pad is also forcibly moved in the opposite direction.

[0029] According to a preferred embodiment of the invention, the lever or at least one of the racks is designed to be elastically deformable, at least in certain areas. The elastically deformable design is advantageous (R. 415567).

[0030] - 7 -

[0031] This ensures that the brake pads are spring-elastically coupled to each other. In particular, no additional spring element is then necessary.

[0032] The coupling mechanism particularly preferably comprises at least one, in particular a first and a second, spring element, especially a coil spring or elastomer, which is / are connected at one end to one of the ends, in particular the first end, of the lever or one of the racks, and at the other end to one of the brake pads or the brake caliper. The advantage of one or more such spring elements is that the brake pads are directly or indirectly spring-elastically coupled to the lever or the respective rack and thus to each other. In particular, if several spring elements are used, the spring elements have the same spring constant and / or are geometrically identical, so that the spring forces are balanced in an unactuated state of the wheel brake device.

[0033] According to a preferred embodiment of the invention, the spring element, in particular the first one, is connected to the first brake pad and / or the spring element, in particular the second one, is connected to the second brake pad. This advantageously ensures that the respective brake pad is directly coupled to the lever or the respective rack in a spring-like manner.

[0034] Preferably, the brake caliper has a U-shaped cross-section and comprises a first and a second leg, with the first spring element connected to the first leg and / or the second spring element connected to the second leg. This connection of the respective spring elements offers the advantage that the spring-elastic coupling is achieved indirectly via the support on the brake caliper. Thus, the orientation of each spring element is geometrically and reliably fixed by the corresponding leg of the brake caliper.

[0035] According to a preferred embodiment of the invention, the spring element, or at least one of the spring elements, is pushed at least partially at at least one end onto a projection arranged on the lever, one of the racks, one of the brake pads, or the brake caliper. R. 415567

[0036] - 8 -

[0037] By sliding it onto the projection, it is advantageously ensured that the spring element is geometrically securely fixed in its orientation.

[0038] Particularly preferred is the spring element, or at least one of the spring elements, being inserted, at least partially, with at least one end into a receptacle formed on the lever, one of the racks, one of the brake pads, or the brake caliper. Insertion into the receptacle also has the advantage that the spring element's orientation is geometrically fixed.

[0039] According to a preferred embodiment of the invention, the spring element, or at least one of the spring elements, has a hook at at least one end and is engaged by the hook in a hook receptacle, in particular a through-hole, formed on the lever, one of the racks, one of the brake pads, or the brake caliper. By engaging the spring element in the hook receptacle, it is advantageously ensured that it is geometrically securely fixed.

[0040] The coupling mechanism particularly preferably comprises at least one connecting rod which is connected at one end, in particular the second end, of the lever or one of the racks, and at the other end to the brake caliper, to one of the brake pads, in particular to the first brake pad, or to an actuating element connected to the first brake pad, in particular to a radial projection of the actuating element. Such use of the connecting rod offers the advantage that the lever or rack is reliably coupled to the brake pad, either directly or indirectly. In particular, the actuating element is designed as a brake piston.

[0041] Further preferred features and combinations of features will become apparent from the foregoing and from the claims. The invention will now be explained in more detail with reference to the drawings. These drawings show...

[0042] Figures 1A to 1D show schematic embodiments of advantageous wheel brake devices, and R. 415567

[0043] - 9 -

[0044] Figure 2 shows one of the embodiments in a detailed view.

[0045] Figures 1A to 1D each show various embodiments of advantageous wheel brake devices 1 in a purely schematic view to illustrate the respective operating principle. The wheel brake device 1 is, in particular, in each case a component of a braking system of a motor vehicle, which is not shown in any further detail.

[0046] Because the exemplary embodiments are identical in essential features, they will be described together below; functionally relevant differences will be addressed at appropriate points.

[0047] The wheel brake assembly 1 comprises a brake holder 2, a brake caliper 3 designed as a floating caliper, and a controllable actuator 4. The actuator 4 is connected to the brake caliper 3 and is specifically designed as an electric machine.

[0048] The wheel brake assembly 1 further comprises a first brake pad 5, a second brake pad 6, and a brake disc 7. The brake pads 5 and 6 are assigned to different sides 10 and 11 of the brake disc 7 and are mounted so that they can slide towards each other to generate a braking force. The first brake pad 5 is assigned to a first side 10, and the second brake pad 6 is assigned to a second side 11 opposite the first side 10. In particular, the brake pads 5 and 6 are mounted so that they can slide on the brake holder 3.

[0049] The brake caliper 3 has a U-shaped cross-section and comprises a first leg 20 and a second leg 21, so that it completely surrounds the brake disc 7 with the brake pads 5 and 6. The first leg 20 is thus assigned to the first brake pad 5, and the second leg 21 to the second brake pad 6.

[0050] The first brake pad 5 is displaceable by means of the actuator 4. For this purpose, the wheel brake assembly 1 has at least one gear arrangement 8, in particular a spindle gear. The first brake pad 5 is, in this case, connected to the first brake pad 5, for example, by a brake piston R. 415567

[0051] - 10 -

[0052] trained actuating element 9, operatively connected to the actuator 4 by means of the gear arrangement 8.

[0053] The second brake pad 6 can be moved by means of the brake caliper 3 by the reaction force generated when the first brake pad 5 is moved. Specifically, the second brake pad 6 is connected to the brake caliper 3, for example at the second arm 21. Thus, because the actuator 4 is rigidly connected to the brake caliper 3, the brake caliper 3, at the latest when the first brake pad 5 contacts the brake disc 7, will move the actuator 4 together with the brake caliper 3 away from the brake disc 7, so that the second brake pad 6 is forcibly moved towards the brake disc 7.

[0054] As explained in detail above, this coupling only functions in the clamping direction of the wheel brake assembly 1. To ensure that the brake pads 5 and 6 are also completely lifted from the brake disc 7 in the opposite direction, and that any residual rubbing torque is reliably prevented, the wheel brake assembly 1 has at least one first reversing linkage 12. The brake pads 5 and 6 are spring-elastically coupled to each other by means of the linkage 12.

[0055] Preferably, the wheel brake device 1 has at least one second linkage 12 arranged at a distance from the first linkage 12, in particular designed symmetrically to the first linkage 12, so that the brake linings 5, 6 are each spring-elastically coupled to each other by means of the linkage 12.

[0056] Various reversing gears are suitable as coupling gears 12. Preferably, a lever gear and / or a rack and pinion gear are used. In the exemplary embodiments shown here, lever gears are used; according to further embodiments not shown, these can be replaced or supplemented by rack and pinion gears.

[0057] The coupling mechanism 12 has a lever 13 which is rotatably mounted on the brake bracket 2. In this case, the lever 13 is angled transversely to R. 415567

[0058] - 11 -

[0059] The pivot axis is rotatably mounted in a direction of displacement of the brake pads 5, 6, aligned with the respective displacement direction. The displacement direction is indicated by a corresponding double arrow 27, and the pivot axis projects perpendicularly from the plane of the drawing at a pivot point 14 of the lever, and is indicated by a corresponding double arrow 15.

[0060] The lever 13 has a first end 16 and a second end 17 facing away from the first end 16. The first end 16 is connected to the first brake pad 5, and the second end 17 to the second brake pad 6. The lever 13 is rotatably mounted on the brake holder 2, particularly at its midpoint, between the two ends 16 and 17.

[0061] According to other embodiments not shown, the axis of rotation has a different angle to the plane of the drawing, in particular it lies perpendicular to the plane of the drawing (i.e. tilted by 90° to the present representation), as long as it is still oriented transversely to the (horizontal in the plane of the drawing) direction of displacement (i.e. it can have any angle between the one shown and the tilt by 90°).

[0062] As already indicated, the coupling mechanism 12 can also be designed as a rack and pinion mechanism. According to further embodiments not shown, it then has a gear which, analogous to the lever 13, is rotatably mounted on the brake bracket 2.

[0063] The coupling mechanism 12 also has a first and a second rack, which are aligned parallel to each other and each engages with the gear. The first rack has a first end coupled to the first brake pad 5, and the second rack has a second end coupled to the second brake pad 6.

[0064] In the present embodiments, the coupling mechanism 12 has at least one spring element 18, 19 for spring-elastic coupling, which is connected at one end to one of the ends 16, 17 of the lever 13 or, according to a further embodiment not shown, to one of the racks, and at the other end to one of the brake pads 5, 6 or the brake caliper 3. R. 415567

[0065] - 12 -

[0066] Spring element 18, 19 is designed in particular as an elastomer or, as in the present case, as a helical spring.

[0067] In particular, the coupling mechanism 12, if it has only one spring element 18, 19, or if the spring elements 18, 19 are assigned to the same ends 16, 17 of the lever 13 (or the rack), has at least one connecting rod 22 which is connected at one end to the respective unused end 16, 17 of the lever 13 (or one of the other racks), and at the other end to the brake caliper 3, to one of the brake pads 5, 6, or to the actuating element 9.

[0068] The embodiments differ in the precise arrangement and connection of the spring element(s) 18, 19. Alternatively or additionally, the lever 13 or at least one of the racks for spring-elastic coupling is designed to be elastically deformable, at least in certain areas.

[0069] In the first embodiment shown in Figure 1A, the linkage 12 has a first spring element 18 and a second spring element 19. The first spring element 18 is connected at one end to the second end 17 of the lever 13 and at the other end to the brake caliper 3, in particular to the first leg 20. The second spring element 19 is also connected at one end to the second end 17 of the lever 13 and at the other end to the brake caliper 3, spaced apart from the first spring element 18, in particular to the second leg 21.

[0070] Furthermore, the coupling mechanism 12 has at least one connecting rod 22 which is connected at one end to the first end 16 of the lever 13 and at the other end to the actuating element 9, in particular to a radial projection of the actuating element 9.

[0071] In the second embodiment shown in Figure 1B, the coupling mechanism 12 has only a single spring element 19. The spring element 19 is connected at one end to the second end 17 of the lever 13 and at the other end to the second brake pad 6. R. 415567

[0072] - 13 -

[0073] Furthermore, the coupling mechanism 12 again has at least one connecting rod 22, which is connected at one end to the first end 16 of the lever 13 and at the other end to the actuating element 9, in particular to a radial projection of the actuating element 9.

[0074] In the third embodiment shown in Figure 1C, the coupling mechanism 12 has a first spring element 18 and a second spring element 19. The first spring element 18 is connected at one end to the first end 16 of the lever 13 and at the other end to the first brake pad 5. The second spring element 19 is connected at one end to the second end 17 of the lever 13 and at the other end to the second brake pad 6.

[0075] In the fourth embodiment shown in Figure 1D, the coupling mechanism 12 has a first spring element 18 and a second spring element 19. The first spring element 18 is connected at one end to the second end 17 of the lever 13 and at the other end to the brake caliper 3, in particular to the first leg 20. The second spring element 19 is also connected at one end to the second end 17 of the lever 13 and at the other end to the brake caliper 3, spaced apart from the first spring element 18, in particular to the second leg 21.

[0076] Furthermore, the coupling gear 12 has at least one connecting rod 22 which is connected at one end to the first end 16 of the lever 13 and at the other end to the first brake pad 5.

[0077] Several variants are conceivable for the actual connection of the spring elements 18, 19, which are not shown here due to the schematic representation. For example, the spring element 18, 19, or at least one of the spring elements 18, 19, is pushed, at least partially at at least one end, onto a projection arranged on the lever 13, one of the racks, one of the brake pads 5, 6, or the brake caliper 3.

[0078] Alternatively or additionally, the spring element 18, 19 or at least one of the spring elements 18, 19 with at least one end is at least partially in R. 415567

[0079] - 14 -

[0080] a receptacle formed on the lever 13, one of the racks, one of the brake pads 5, 6 or the brake caliper 3, and / or has a hook at at least one end, and is hooked into a hook receptacle formed on the lever 13, one of the racks, one of the brake pads 5, 6 or the brake caliper 3, in particular a through hole.

[0081] Figure 2 shows a detailed view of a wheel brake assembly 1 based on the third embodiment shown in Figure 1C. The brake bracket 2 and the brake caliper 3, designed as a floating caliper, are visible. The brake caliper 3 is slidably mounted on the brake bracket 2 by means of guide pins 23.

[0082] The first brake pad 5 and the second brake pad 6 are arranged on both sides of the brake disc 7 and are slidably mounted on the brake caliper 3. The U-shaped brake caliper 3 has a first arm 20 and a second arm 21, so that it completely surrounds the brake disc 7 with the brake pads 5 and 6. The actuating element 9 connected to the first brake pad 5 is also visible.

[0083] The wheel brake assembly 1 comprises two spaced-apart, symmetrically designed second linkage 12s, such that the brake linings 5, 6 are spring-elastically coupled to each other by means of the linkage 12s. For clarity, only one of the linkages is fully labelled with reference numerals.

[0084] The coupling gears 12 each have a lever 13 which is rotatably mounted on the brake bracket 2. The axis of rotation about the pivot point 14 is, as indicated above, tilted by 90° compared to the previous illustrations.

[0085] Furthermore, the coupling gears 12 each have the first spring element 18 and the second spring element 19, which are each designed as coil springs. The first spring element 18 is connected at one end to the first end 16 of the lever 13 and at the other end to the first brake pad 5. The second R. 415567

[0086] - 15 -

[0087] Spring element 19 is connected at one end to the second end 17 of the lever 13 and at the other end to the second brake pad 6.

[0088] The first spring elements 18, 19 are each, at least partially, pushed onto a projection 24 arranged on the respective brake lining 5, 6 at one end face. At their end face opposite the projection, they each have a hook 25, and the hook 25 is engaged in a hook receptacle 26, in this case a through hole, formed on the lever 13.

Claims

R. 415567 - 16 - Claims 1. Wheel brake device (1) for a braking system of a motor vehicle, comprising a brake holder (2), with a brake caliper (3) slidably mounted on the brake holder (2), with a controllable actuator (4) connected to the brake caliper (3), in particular an electric machine, with a first brake pad (5) which can be moved by means of the actuator (4), with a second brake pad (6) which can be moved by means of the brake caliper (3) and in particular is connected to the brake caliper (3), and with a brake disc (7), - wherein the brake pads (5,6) are assigned to different sides (10,11) of the brake disc (7) and are mounted so as to be displaceable towards each other in order to generate a braking force, characterized by that the wheel brake device (1) has at least one first reversing coupling mechanism (12), and that the brake pads (5,6) are spring-elastically coupled to each other by means of the coupling mechanism (12).

2. Wheel brake device according to claim 1, characterized in that the wheel brake device (1) has at least one gear arrangement (8), in particular a spindle gear, and that the first brake pad (5), in particular an actuating element (9) connected to the first brake pad (5), is operatively connected to the actuator (4) by means of the gear arrangement (8).

3. Wheel brake device according to one of the preceding claims, characterized in that the first brake pad (5) and / or the second brake pad (6) is / are slidably mounted on the brake holder (3). R. 415567 - 17 - 4. Wheel brake device according to one of the preceding claims, characterized in that the wheel brake device (1) has at least one second linkage device (12) arranged at a distance from the first linkage device (12), in particular designed symmetrically to the first linkage device (12), and that the brake linings (5, 6) are each spring-elastically coupled to each other by means of the linkage devices (12).

5. Wheel brake device according to one of the preceding claims, characterized in that the linkage (12) has a lever (13) or a gear which is rotatably mounted on the brake holder (2), in particular about an axis of rotation oriented transversely to a respective displacement direction of the brake pads (5,6).

6. Wheel brake device according to claim 5, characterized in that the coupling mechanism (12) has a first and a second rack which are aligned parallel to each other and each engage with the gear, and that the first rack has a first end coupled to the first brake pad (5) and the second rack has a second end coupled to the second brake pad (6).

7. Wheel brake device according to claim 5, characterized in that the lever (13) has a first end (16) coupled to the first brake pad (5) and a second end (17) coupled to the second brake pad (6), and that the lever (13) is rotatably mounted on the brake holder (2), in particular centrally, between the two ends (16, 17).

8. Wheel brake device according to one of claims 6 and 7, characterized in that the lever (13) or at least one of the racks is designed to be elastically deformable at least in certain areas.

9. Wheel brake device according to one of claims 5 to 8, characterized in that the coupling mechanism (12) has at least one, in particular a first and a second, spring element (18, 19), in particular a coil spring or elastomer, which is connected at one end to one of the ends (16, 17), in particular to the first end (16), of the lever (13) or one of the R. 415567 - 18 - racks, and on the other hand connected to one of the brake pads (5,6) or the brake caliper (3).

10. Wheel brake device according to claim 9, characterized in that the, in particular the first, spring element (18,19) is connected to the first brake pad (5) and / or the, in particular the second, spring element (18,19) is connected to the second brake pad (6).

11. Wheel brake device according to one of claims 9 and 10, characterized in that the brake caliper (3) has a U-shaped cross-section and a first and a second leg (20, 21), and that the first spring element (18) is connected to the first leg (20) and / or the second spring element (19) is connected to the second leg (21).

12. Wheel brake device according to one of claims 9 to 11, characterized in that the spring element (18,19) or at least one of the spring elements (18,19) is pushed at least partially at at least one end onto a projection (24) arranged on the lever (13), one of the racks, one of the brake linings (5,6) or the brake caliper (3).

13. Wheel brake device according to one of claims 9 to 12, characterized in that the spring element (18,19) or at least one of the spring elements (18,19) is inserted with at least one end at least partially into a receptacle formed on the lever (13), one of the racks, one of the brake linings (5,6) or the brake caliper (3).

14. Wheel brake device according to one of claims 9 to 13, characterized in that the spring element (18,19) or at least one of the spring elements (18,19) has a hook (25) at at least one end and is hooked into a hook receptacle (26), in particular a through hole, formed on the lever (13), one of the racks, one of the brake linings (5,6) or the brake caliper (3).

15. Wheel brake device according to one of claims 5 to 14, characterized in that the coupling mechanism (12) has at least one coupling rod R. 415567 - 19 - (22) having a connection at one end, in particular the first end (16), of the lever (13) or one of the racks, and at the other end to the brake caliper (3), to one of the brake pads (5, 6), in particular to the first brake pad (5), or to an actuating element (9) connected to the first brake pad (5), in particular to a radial projection of the actuating element (9).

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