CN116997730A - Brake pad system and sensor unit - Google Patents

Abstract

The invention proposes and describes a brake lining system (2) for a disc brake of a railway vehicle, comprising a lining holder (1) and comprising at least one brake lining (3) connected to the lining holder (1), preferably comprising two brake linings (3), and comprising a sensor device with a sensor unit (8) with at least one wear sensor for determining the wear state of the brake linings (3).

Description

Brake pad system and sensor unit

Technical Field

The invention relates to a brake pad system (brake lining system) for a disc brake of a rail vehicle, having a pad holder and having at least one brake pad (brake pad) connected to the pad holder, preferably having two brake pads connected to the pad holder. The invention further relates to a sensor unit for a brake lining system of a disk brake of a rail vehicle.

Background

The known brake pad or a component of the brake pad is inserted in a brake pad system (brake pad systems) of known design in a rail vehicle and is inserted mainly through a dovetail guide into the pad holder. Thus, the brake pad has a friction surface size whose effective area cannot be changed during use. By means of different locking means, the dovetail guide can be securely closed when one or more brake pads are located in the dovetail guide. Furthermore, a modular brake lining system is known, for example from DE102012012876A1, which has a carrier plate held on at least one back part and has a plurality of different friction sections, wherein the different friction sections comprise friction surfaces with different geometries and/or different dimensions and/or different friction coefficients and/or different friction materials, and wherein the different friction sections of the brake lining system can be fixed to the carrier plate as required.

During operation of the rail vehicle, the brake pads are subjected to high mechanical loads, which cause the brake pads, including the retainer system, to become stuck. Incidentally, during the braking process, the temperature of the brake disc rises sharply, which promotes wear of the brake pads. Wear is further increased due to non-optimal pressure and speed distribution over the cross-section of the brake pad, and wear can also occur in a very irregular manner on the surface of the brake pad. In addition to the material temperature and specific material properties of the pads, the wear of the brake pads is also dependent, inter alia, on the speed at which the brake disc moves past the friction surface of the brake pad and the contact pressure of the friction surface against the brake disc.

In order to check the wear of the brake lining and to check any wear-related damage to the brake lining system, after a certain operating time and/or a certain number of operating revolutions has been reached, maintenance personnel visually check the brake lining (brake lining) and the lining holder (lining holder) on the basis of the train crew experience values and, depending on the result of the check, propose an action proposal to replace the brake lining and/or, if necessary, to take further maintenance measures on the brake lining system. However, visual inspection of brake pad wear and wear conditions of the brake pad system is error-prone, and the quality of the inspection depends on the experience of the service personnel. Therefore, it cannot be excluded: maintenance personnel do not properly evaluate the wear condition of the brake pads and brake pad system, such that the brake pads are replaced too late. This can negatively impact the functional safety of the brake system and jeopardize the safety of the rail traffic. Furthermore, excessive wear of the brake pads can cause abrasive damage to other components of the brake pad system, particularly to the pad holders.

Disclosure of Invention

The object of the present invention is to provide a brake lining system of the initially mentioned type which allows the wear state of the brake lining used to be determined in a cost-effective and constructively simple manner, in particular automatically and independently of visual inspection. In particular, the object of the present invention is to create a possibility for the in particular automatic determination of the wear state of a brake lining, which can be retrofitted in a simple manner and which can be used universally for different brake lining systems. In addition, a high degree of reliability of the wear detection is also ensured.

The above-mentioned object is achieved by a brake lining system having the features of claim 1 and a sensor unit for a sensor device of a brake lining system having the features of claim 10. Advantageous embodiments of the invention are the subject matter of the dependent claims.

In order to solve the above-mentioned task, according to the invention, a brake lining system for a disk brake of a rail vehicle is proposed, which has a lining holder and has at least one brake lining connected to the lining holder, which preferably has two brake linings, which has a sensor device with a sensor unit having at least one wear sensor for determining the wear state, i.e. the wear or the degree of wear, of the brake linings. Multiple sensor units may also be provided to detect wear at different points of the friction pad. The wear sensor is designed as a component of the sensor arrangement and is arranged to determine the wear condition of the brake pad, preferably the wear sensor is arranged to determine the wear condition of the brake pad during operation of the disc brake. The sensor device also has an evaluation unit, which is connected to the sensor unit via a wireless device or a wired device, which is designed to evaluate the sensor signal and to generate at least one wear warning and/or wear indication, and which can comprise a corresponding display device.

In the sense of the present invention, the term "brake pad system" should be interpreted broadly and in principle relates to any brake pad configuration in which at least one brake pad is attached to and held by a pad holder. Preferably, however, the present invention relates to a brake pad configuration in which one or more brake pads are positioned in corresponding pad guides of a brake pad holder by dovetails.

The wear condition of the brake pads can be determined qualitatively or quantitatively. In a qualitative determination, an event is detected that the friction material layer of the brake pad reaches a certain degree of wear or a certain wear thickness and/or that the brake pad reaches a certain remaining pad thickness. In the quantitative determination, the amount of wear thickness of the friction material layer of the brake pad and/or the amount of remaining pad thickness of the brake pad may be determined in units of [ mm ]. Discontinuous or continuous wear determination is possible.

The plurality of sensors may be integrated into the sensor unit, whereby the first sensor may be arranged for detecting a first wear state of the friction lining, whereupon, upon detection of the first wear state, a first wear indication is generated. The second sensor is arranged for: the more severe second wear state is detected, in particular before a certain wear limit is reached, whereupon a second wear indication is generated when the second wear state is detected.

The wear sensor can be operated without contact and is designed as a proximity sensor or a (per) temperature sensor. A wear warning may be generated and/or a wear indication provided when the brake pad is worn to such an extent that the distance between the sensor and the brake disc is sufficiently small and/or the sensor temperature rises above a predetermined limit value.

The wear sensor can also be designed as a contact sensor. If the sensor contacts the brake disc and a ground contact occurs when the friction pad reaches a certain level of wear, a wear warning is generated. Finally, the sensor unit may also comprise a wear element comprising a conductive element which is cut off by the brake disc at a certain value, preferably before the wear limit of the brake pad, and thus the ground connection is separated, which in turn generates a wear warning.

The sensor unit and/or the wear element of the sensor unit are heat-resistant at least until the limit value of the operating temperature of the brake lining and/or the disc brake is reached during the braking operation. A metal material may be used, or preferably, a thermosetting material may be used. If a conductor loop is implemented in the wear element, the conductor loop is also resistant to high temperatures before the maximum operating temperature is reached.

Nor is it excluded that in this embodiment the cable loop is embedded in the friction material of the brake pad and that when the wire comes into contact with the brake disc with a certain degree of wear of the brake pad, a ground contact occurs, which in turn generates a wear warning. Interruption of the ground contact also generates a wear warning.

In a particularly preferred embodiment of the brake lining system according to the invention, however, the sensor unit is formed by a separate structural unit, in particular wherein the sensor unit is a retrofit part which is adapted to the generic, standardized geometry of the lining holder and the brake lining in the known brake lining design.

It is particularly preferred that the sensor unit is adapted as a separate structural unit to a pad holder conforming to the DIN EN 16451:2015-09 standard and/or to a brake pad conforming to the DIN EN1 5328:2020-10 standard or to the UIC541-3 eighth edition standard as a template for the above-mentioned standard.

The design of the sensor unit as a separate component enables an easy installation of the sensor unit on an installed brake lining system and an easy replacement of the sensor unit, in particular whereby the sensor unit can be replaced together with the friction lining.

The sensor unit can also be retrofitted to existing brake pad systems without difficulty, in adaptation to the geometry of the usual brake pad design, without having to modify the design of the brake pad system, i.e. without having to modify the design of the pad holder and the friction pad. In particular, no additional drilling or modification of the construction of the pad holder is required to influence the strength of the pad holder to retrofit the sensor unit. Thus, retrofitting an existing brake pad system with a sensor unit does not necessarily require approval by approval authorities of various countries.

Particularly preferably, the sensor unit is connected to the brake pad holder, preferably the sensor unit is connected to the brake pad holder in a non-destructively detachable manner. The sensor unit may be held and/or fastened to the pad holder in a form-fitting manner and/or in a non-form-fitting manner. In order to ensure that the sensor unit is securely held on the pad holder during a braking operation, the connection between the sensor unit and the pad holder may be spring loaded. However, it is not excluded to screw or rivet the sensor unit to the pad holder and/or to screw or rivet the sensor unit to the pad holder. However, a material-locking connection, for example by gluing, is not excluded.

In particular, the sensor unit may be inserted, plugged and/or pushed into a recess, opening or cavity in and/or on the pad holder and then secured to the pad holder by suitable fasteners.

In a preferred embodiment, the sensor unit can be arranged at least partially in a free space formed between the brake pad and the brake pad holder in the assembled state, preferably the sensor unit can be arranged largely in a free space formed between the brake pad and the brake pad holder in the assembled state. The dimensions and geometry of the free space are predetermined by the construction of the brake pad and pad holder in the state of the components being connected to each other (assembled state). The sensor unit is thus fitted at least partially as an integral structural unit into the structure of the brake lining system according to the invention. Thus, even in existing brake pad systems, the sensor unit can be easily incorporated into the system design and then form an integral structural unit located between the brake pad and the brake pad holder. Furthermore, the sensor unit is firmly held on the brake lining system and is largely protected during rough braking operations due to the arrangement of the sensor unit in free space.

Particularly preferably, the sensor unit can be inserted, pushed or plugged at least partially into the free space formed between the brake pad and the pad holder from the outside or from the side, preferably from the front or the side of the locking latch of the pad holder into the free space formed between the brake pad and the pad holder.

In this case, the sensor unit may have a base body which is designed as a molded body and whose geometry and dimensions are adapted to the geometry and dimensions of the free space. The base body is then considered to be an integral structural unit between the brake pad and the brake pad holder, and is in particular supported downwardly on the pad holder. Furthermore, in particular, the base body does not protrude outwards beyond the brake pad and/or the pad holder, so that the base body is firmly arranged between the brake pad and the pad holder and is protected against damage. In particular, the base body may be inserted into the free space from the outside, preferably from the front or on the side of the locking latch of the pad holder.

Particularly preferably, the sensor unit can have a base body which is arranged in the assembled state underneath the brake pad and/or which is inserted in the assembled state into the pad guide of the pad holder, preferably from the front via an insertion opening of the pad guide. Dovetail geometry may be provided on the pad holder for guiding the brake pad on the pad holder. Then, the base body of the sensor unit may be inserted into the insertion opening from the front into a free space formed between the upper side portion of the pad holder in the region of the pad guide and the adjacent lower side portion of the brake pad. Alternatively, the base body can also be held laterally on the pad holder, whereby an eyelet can be cast on the pad holder, for example for screwing or riveting the sensor unit to the pad holder.

The invention relates in particular to a brake lining system in which at least one brake lining, preferably two brake linings, is positioned by means of dovetails in corresponding lining guides of a lining holder and the lining guides can be closed with single-sided bolts or double-sided bolts. Then, the base body of the sensor unit may be inserted into the opening of the pad guide on the latch side, and it is also preferable that the base body of the sensor unit is mounted in front of the latch in an assembled or fastened state. The base body may have a stop edge or boss that stops against the pad holder and determines the assembly position when the sensor unit reaches the assembled state.

Preferably, the base body is composed of a thermosetting plastic, which is preferably not electrically conductive and heat resistant, at least before the maximum operating temperature of the brake lining system and/or the disc brake is reached.

In order to receive the at least one wear sensor, the base body has at least one sensor portion, wherein the base body is preferably formed in one piece with the sensor portion and is composed of a material which is resistant to temperatures up to the maximum operating temperature of the brake lining system or the brake disc. The plurality of spaced apart sensor portions may also be formed on the base body, e.g., the plurality of spaced apart sensor portions may also be formed on opposite sides of the base body.

The sensor portion is preferably arranged on the outer edge of the base body and in the assembled state is preferably positioned outside the free space formed between the brake pad and the pad holder and/or adjacent to the brake pad in the lateral direction. In particular, the sensor portion is not covered by the brake pad at the top, so that the possibility of detecting the wear condition of the brake pad using the contact sensor, proximity sensor or temperature sensor described at the beginning can be achieved.

A left-right design of the sensor unit is possible if the wear sensor is arranged laterally adjacent to the brake pad, wherein the sensor portion is provided on the left or right side of the base body of the sensor unit.

The outer surfaces on the upper and lower side of the base body preferably define an upper and a lower mounting plane of the sensor unit, whereby the base body reaches a maximum thickness between the mounting planes, which allows the base body to be incorporated into the free space between the pad holder and the brake pad. The sensor part may then project upwards beyond the upper mounting plane of the base body, or the sensor part may be formed by a preferably block-shaped protrusion having at least one receiving opening for receiving the wear sensor.

Preferably, the sensor part has at least two receiving openings for receiving two wear sensors, whereby the receiving openings can extend upwards to different extents, so that the sensors are arranged at different heights from the brake disc or at different distances from the brake disc in the assembled state. Such a first wear state may be detected by a first sensor arranged higher when the pad wear reaches a first wear thickness of the friction material or when the pad thickness reaches a first limit value, followed by triggering the generation of a first wear warning or a first closure indication. This may be used, for example, to indicate that the liner will soon need to be replaced. If wear continues to increase and pad wear reaches a second wear thickness of the friction material, or reaches a defined minimum thickness of the brake pad, such a second wear condition may be detected by a second, lower sensor and a wear warning or wear indication is generated indicating an urgent need to replace the pad.

The base body with the sensor portion may also be built entirely under the pad holder. Preferably, the sensor portion does not protrude laterally or forwardly beyond the pad holder. This can protect the sensor portion of the sensor unit from external damage as much as possible.

The contact between the one or more sensors and the evaluation unit may be made by wires via a cable, which may preferably exit from the bottom side of the sensor portion and be routed to the evaluation unit. In the region of the sensor part, the base body may have a recess on the bottom side of the base body, so that a free space is formed between the sensor part and the lower mounting plane of the base body, via which free space the cable exits from the sensor part, and the cable can be routed to the evaluation unit in a simple manner.

The geometry of the base body in the region of the sensor portion can also be adapted to a geometry predetermined by the relative arrangement of the pad holder and the brake pad. In particular, the sensor portion may have a chamfer or chamfer on the side of the brake pad such that the brake pad is spaced apart from the sensor portion in the assembled state.

In an alternative embodiment of the present invention, it may be provided that: the sensor unit is arranged between the two brake pads, preferably between the two brake pads and in the central region of the pad holder. Thus, the sensor portion of the base body with the at least one wear sensor preferably extends vertically upwards between adjacent brake pads. The base body is firmly seated in the base of the brake pad, in particular, the base body is firmly seated in the pad guide. In order to enable the sensor unit to be arranged between adjacent brake pads, the brake pads can also be shortened and have a smaller extension in the longitudinal direction than the length of the brake pads in conventional brake bellows designs. The sensor portion preferably does not protrude laterally beyond the brake pad.

Thus, during assembly, the first brake pad is inserted into the pad guide through the insertion opening of the pad guide by the dovetail of the first brake pad. When the first brake pad reaches its end position, the sensor unit is inserted into the pad guide through the insertion opening of the pad guide until the sensor portion abuts against the end face of the inserted brake pad. The second brake pad is then inserted into the pad guide through the dovetail of the second brake pad until the brake pad also abuts the sensor portion on the front side. The guide is then closed by the latch. This holds the sensor unit firmly between the brake pads and protects the sensor unit from external damage. The arrangement of the sensor unit between two brake pads fixed to the pad holder may be particularly advantageous for special vehicles.

The signal transmission of the sensor may be a wired transmission or a wireless transmission via radio. A transponder for signal transmission via radio may also be provided.

The sensor portion of the base body of the sensor unit may be provided as a wear element. An electrical conductor can then be provided in the sensor part, which conductor is cut off by the brake disc when a certain pad thickness is reached and thereby the ground connection is separated, thereby generating a wear warning. A transponder may also be provided in the sensor part, which transponder is destroyed when a certain pad thickness is reached, so that the signal transmission ends, thereby generating a wear warning. It is also possible to incorporate a conductive member in the sensor portion, which is in contact with the brake disc when the pad reaches a certain degree of wear, so that a ground contact occurs, thereby generating a wear warning. If the sensor portion or the base body of the sensor unit is entirely made of electrically conductive material, grounding contact will also occur when the friction lining reaches a certain degree of wear and the brake disc is in contact with the sensor portion.

Drawings

The invention will be described below by way of examples of embodiments with reference to the accompanying drawings. The drawings show:

figure 1 is a top perspective view of a pad holder of a brake pad system according to the invention in an oblique view,

figure 2 is a perspective view of the brake pad system according to the invention in a partially assembled state when the brake pad is secured to the pad holder of figure 1,

FIG. 3 is a front partial perspective view of the latch side of the brake pad system according to the present invention with a sensor unit disposed between the pad holder and the front brake pad;

figure 4 is a side partial view of the latch side of the brake pad system shown in figure 3,

figure 5 is a top partial view of the latch side of the brake pad system shown in figure 3,

figure 6 is a top perspective view of a possible embodiment of a sensor unit for a brake lining system according to the invention,

figure 7 is a bottom partial perspective view of the sensor unit of figure 6 from a perspective view,

fig. 8 is the sensor unit of fig. 6, wherein a wired signal transmission is performed between the sensor unit and the evaluation unit,

fig. 9 is the sensor unit of fig. 6, wherein wireless signal transmission is performed between the sensor unit and the evaluation unit,

FIG. 10 is a top perspective view of another embodiment of a brake pad system in a partially assembled state thereof, wherein a sensor unit is disposed between two friction pads mounted on a pad holder, and

fig. 11 is a top perspective view of the brake pad system of fig. 10 in a fully assembled state of the brake pad system.

Detailed Description

Fig. 1 shows the pad holder 1 of the brake pad system 2 shown in fig. 2 in a partially assembled state. The brake pad system 2 is designed to attach two brake pads 3 to the pad holder 1. The brake pads 3 have a dovetail geometry on the bottom side and are each inserted into a pad guide 6 of the pad holder 1 by way of the dovetail via an insertion opening 4 of the pad holder 1 on the latch side 5 of the brake pad system 2. When the two brake pads 3 have reached the respective mounting positions, the pad guides 6 are closed with bolts 7 in a manner known per se. Corresponding screw locks are described, for example, in DE 35 43457A1 and DE 42 27 725 A1.

In fig. 3, the brake lining system 2 is shown in an assembled state of the lining holder 1 and the brake lining 3, seen in the direction of the latch side 5 of the brake lining system 2. As can be seen from fig. 3, the sensor unit 8 is at least partially arranged in a free space formed between the pad holder 1 and the latch-side brake pad 3 in the assembled state of the brake pad system 2. Fig. 4 shows the latch side 5 of the brake lining system 2 from the side, and fig. 5 shows the latch side 5 of the brake lining system 2 from above before the brake lining 3 is mounted on the lining retainer 1.

The sensor unit 8 is connected to an evaluation unit 16, which is schematically shown in fig. 8 and 9, the sensor unit 8 having at least one contact sensor, proximity sensor or temperature sensor, or the sensor unit 8 being designed for determining at least one wear state of the brake lining 3. The evaluation unit 16 is arranged and designed for evaluating the sensor signal and generating a wear warning and/or a wear indication. The sensor means may comprise corresponding indication means, such as an indicator light or the like. The evaluation unit 16 and any display means are arranged spaced apart from the pad holder 1 and the brake pad 3.

In particular, the sensor unit 8 is a separate structural unit, more particularly the sensor unit 8 is a retrofit component, the sensor unit 8 being geometrically and dimensionally adapted to the system design of the brake lining system 2, in particular the geometry and dimensions of the sensor unit 8 being adapted to the geometry and dimensions of a free space formed between the lining retainer 1 and the friction lining 3 on the latch side 5 of the brake lining system 2, which free space is used for accommodating the sensor unit 8. In the embodiment shown, the sensor unit 8 is inserted into the pad guide 6 of the pad holder 1 via the insertion opening 4 on the latch side, whereby the sensor unit 8 can rest against the latch 7 on the inside, but this is not necessarily the case. Then, the sensor unit 8 is clamped to the covered holder 1 by an elastic member not shown. Thus, the sensor unit 8 is positioned in front of the bolt 7 and is supported on the pad guide 6 of the pad holder 1. A stop edge 9 is formed on the outer side of the sensor unit 8, which stop edge 9 rests against the outer surface 10 of the covered holder 1 from the outside and determines the mounting position of the sensor unit 8 when the sensor unit 8 is mounted.

As can be seen in particular from fig. 6 and 7, the sensor unit 8 has a base body 11, the geometry and dimensions of which base body 11 are adapted to the geometry and dimensions of the free space formed between the pad holder 1 on the latch side and the brake pad 3 in the mounted state of the brake pad system 2. This relates in particular to the length L and thickness D of the base body 11 in relation to the upper and lower mounting planes Y1 and Y2 of the base body 11. The upper mounting plane Y1 is defined by an edge-side outer surface 12 on the upper side of the base body 11, and the lower mounting plane Y2 is defined by an outer surface 13 on the lower side of the base body 11. The thickness D of the base body 11 is selected such that the base body 11 can be inserted between the pad holder 1 and the friction pad 3 in the region of the pad guide 6. The length L of the base body 11 is smaller than the opening width of the pad guide 6 of the pad holder 1.

The base body 11 has on the upper side a central recess between the outer surfaces 12 on the edge side via which a not shown elastic element for fastening the base body 11 to the pad holder 1 can be guided and/or held.

As can be seen from fig. 3, the base body 11 is arranged approximately below the brake pad 3 in the assembled state, and the base body 11 is supported on the pad holder 1 in the region of the pad guide 6.

The base body 11 has a sensor portion 14 in the form of a block-shaped protrusion, which sensor portion 14 is provided for receiving two wear sensors, and for this purpose, the sensor portion 14 has two receiving openings 15 on the bottom side of the sensor portion 14. The receiving openings 15 preferably extend into the sensor portion 14 to different extents or the receiving openings 15 extend upwards in the mounted state of the sensor unit 8 such that the sensors are arranged at different heights or at different distances from the brake disc relative to the brake disc of the disc brake.

The base body 11 of the sensor unit 8 is preferably formed integrally with the sensor portion 14, which sensor portion 14 is formed as a block-shaped protrusion.

The sensor portion 14 is formed as a boss and extends upward beyond the upper mounting plane Y1 of the base body 11. In the assembled state of the brake lining system 2 (fig. 3), the sensor portion 14 is located outside the free space formed between the lining retainer 1 and the brake lining 3 and is arranged adjacent to the brake lining 3 in the lateral direction.

It is also possible to form a plurality of sensor portions 14 on the base body 11, for example, the plurality of sensor portions 14 being opposite to each other on both lateral sides.

The wear sensor may be an electrical conductor. When the wear of the brake pad reaches a certain value, the disc brake cooperating with the brake pad system 2 may be in contact with the sensor portion 14, and the sensor portion 14 starts to wear from the upper side of the sensor portion 14. Thus, the sensor portion 14 acts as a wear element. When the sensor portion 14 is sufficiently worn by the brake disc, which corresponds to a certain pad wear of the brake pad or a certain remaining pad thickness, the brake disc may be in contact with the electrical conductor and make ground contact, which causes a wear warning or wear indication to be generated. Alternatively, the conductor loop integral with the sensor portion 14 may be cut off by the brake disc, creating a ground connection, which also generates a wear warning or wear indication. It is also possible to integrally form a transponder in the sensor part 14, which transponder communicates wirelessly with the evaluation unit 16. If the transponder is destroyed when the sensor portion 14 is worn, the data transmission ends, possibly causing the generation of a wear warning or wear indication.

The base body 11 has a recess on the bottom side of the base body 11 in the region of the sensor portion 14 via which the cable can be connected with a wear sensor incorporated in the receiving opening 15.

Fig. 5 shows the sensor unit 8 in a left-hand version, wherein the sensor part 14 is arranged on the left half of the pad holder 1. Not shown, but also a right-hand version of the sensor unit 8 is possible, wherein the sensor part 14 is located on the right side.

The first sensor positioned higher may detect the wear of the brake pad 3 corresponding to the larger first remaining pad thickness, while the second sensor positioned lower may detect the wear of the brake pad corresponding to the smaller second remaining pad thickness. Thus, the sensor signal from the higher first sensor may be interpreted as an indication of an impending replacement of a brake pad, while the sensor signal from the lower second sensor may be interpreted as an indication of an emergency replacement of a brake pad.

Fig. 8 and 9 show: the signal transmission between the sensor unit 8 and the evaluation unit 16 can take place either by wire (fig. 8) or wirelessly via radio (fig. 9).

In fig. 10 and 11, an alternative embodiment of a brake lining system 2 according to the invention is shown, wherein fig. 10 shows a partially assembled state of the brake lining system 2 and fig. 11 shows a fully assembled state of the brake lining system 2. The brake lining system 2 has a lining holder 1 and in the fully assembled state the brake lining system 2 has two brake linings 3 mounted on the lining holder 1.

In the embodiment shown in fig. 10 and 11, the sensor unit 8 is arranged between two brake pads 3 in the central region of the pad holder 1. Here, the base body of the sensor unit 8 is inserted into the pad guide 6 and/or the base body of the sensor unit 8 is supported on the pad holder 1 in the region of the pad guide 6. The sensor portion 14 protrudes vertically upwards from the base body in the direction of the surface of the brake pad 3. Preferably, the sensor unit 8 is held on the pad guide 6 in a form-fitting manner, and for this purpose, the sensor unit 8 may have, for example, a dovetail-like geometry on the bottom side of the base body.

List of reference numerals:

1. pad holder

2. Brake pad system

3. Brake pad

4. Insertion opening

5. Latch side

6. Pad guide

7. Latch member

8. Sensor unit

9. Stop edge

10. Outer surface

11. Base body

12. Outer surface

13. Outer surface

14. Sensor part

15. Receiving opening

16. And an evaluation unit.

Claims (10)

1. Brake lining system (2) for a disc brake of a rail vehicle, the brake lining system (2) having a lining holder (1) and having at least one brake lining (3) connected to the lining holder (1), the brake lining system (2) preferably having two brake linings (3), and the brake lining system (2) having a sensor device with a sensor unit (8), the sensor unit (8) having at least one wear sensor for determining a wear state of the brake linings (3).

2. Brake pad system (2) according to claim 1, characterized in that the sensor unit (8) forms a separate structural unit,

in particular, wherein the sensor unit (8) is a retrofit component.

3. Brake pad system (2) according to claim 1 or 2, characterized in that the sensor unit (8) is connected to the pad holder (1),

preferably, the sensor unit (8) is connected to the pad holder (1) in a non-destructively detachable manner.

4. Brake pad system (2) according to one of the preceding claims, characterized in that the sensor unit (8) is arranged at least partially in the following free spaces: the free space is formed between the pad holder (1) and the brake pad (3) in the assembled state.

5. Brake pad system (2) according to one of the preceding claims, characterized in that the sensor unit (8) has a base body (11), the geometry and dimensions of the base body (11) being adapted at least partially to the geometry and dimensions of the free space.

6. Brake pad system (2) according to one of the preceding claims, characterized in that the base body (11) is arranged substantially below the brake pad (3), and/or

The base body (11) is introduced into a pad guide (6) of the pad holder (1) and/or the base body (11) is supported on the pad holder (1) in the region of the pad guide (6).

7. Brake pad system (2) according to one of the preceding claims, characterized in that the base body (11) has a sensor portion (14) for receiving at least one wear sensor, and

preferably, the sensor portion (14) is arranged outside a free space formed between the pad holder (1) and the brake pad (3) and/or the sensor portion (14) is arranged adjacent to the brake pad (3) in the lateral direction.

8. Brake pad system (2) according to one of the preceding claims, characterized in that the sensor unit (8) is arranged between two of the brake pads (3),

preferably, the sensor unit (8) is arranged between two brake pads (3) in a central region of the pad holder (1).

9. Brake pad system (2) according to one of the preceding claims, characterized in that the sensor portion (8) is provided as a wear element of the sensor unit.

10. A sensor unit (8), the sensor unit (8) being for a sensor device of a brake lining system (2) according to one of the preceding claims.