Brake pad and method of assembling same

Abstract

Brake pad (18), said pad (18) comprising a lining (20) made of friction material and provided with at least one particle collection groove, and a lining support (24) connected to one face (22B) of the lining (20), referred to as a mounting face, in which a space (29) is provided between the lining support (24) and the mounting face (22B) of the lining (20), in which space a sealed chamber (50) is arranged, the sealed chamber (50) comprises a suction conduit (52) for fluid communication with a source of negative pressure, wherein the at least one particle collection tank comprises a suction aperture leading to the sealed chamber (50) and in fluid communication with the suction conduit.

Description

Technical Field

[0001] This disclosure relates to brake pads and methods for assembling these pads. Background Technology

[0002] Typically, vehicle braking systems include brake pads that press against elements rotating about an axis of rotation during braking, thereby braking the vehicle. Specifically, in rail transit vehicles such as trains, trams, or subways, braking is achieved using shoe brakes, also known as tread brakes or TBUs (Tread Brake Units). In this type of brake, brake pads, also called wear plates or brake shoes, press against the radially outer surface of the moving wheels of the rail transit vehicle during braking.

[0003] The brake shoes of a shoe brake consist of a liner made of a friction material. One side of this liner that contacts the wheel during braking is called the friction surface, which wears down gradually, as does the wheel itself. This generates particles. Since these particles are pollutants, their release into the environment should be limited. For this purpose, the liner is traditionally equipped with a particle collection groove that is fully open on the friction surface. This groove is in fluid communication with a negative pressure source capable of suctioning the collected particles. For example, a pneumatic hose connects this groove to the negative pressure source, as described in FR 3087238 A.

[0004] There is a need to develop a liner that can ensure a reliable and leak-free connection between the pneumatic hose and the tank, without increasing the size of the liner. Summary of the Invention

[0005] This disclosure improves upon the above situation.

[0006] To this end, a brake pad is proposed, comprising a pad and a pad support. The pad is made of a friction material and has at least one particle collection groove. The pad support is connected to one surface of the pad, referred to as a mounting surface. A space is provided between the pad support and the mounting surface of the pad. The brake pad is characterized in that a sealed chamber is arranged in the space, the sealed chamber including a suction pipe for fluid communication with a negative pressure source. The at least one particle collection groove includes a suction hole leading to the sealed chamber and in fluid communication with the suction pipe.

[0007] Therefore, by using a sealed chamber, particularly the suction conduit contained within it, a reliable and sealed fluid connection can be more easily established between the collection tank and the negative pressure source. Furthermore, since the sealed chamber is located in the space between the pad support and the pad mounting surface (a space already present in prior art brake pads), its presence does not increase the overall size of the pad, nor does it require altering its geometry relative to a known pad. Thus, a leak-proof and reliable fluid connection between the collection tank and the negative pressure source can be achieved without increasing the overall size or altering the pad geometry relative to a known pad. Moreover, because the sealed chamber is designed to be installed in the space between the pad support and the pad mounting surface, maintenance operations on the brake pads remain unchanged. More specifically, the pads installed in the braking system can be replaced with new pads as in the prior art, as described below.

[0008] The brake pad is, for example, the wear plate (or brake shoe) of a shoe brake (or tread brake, or TBU) on a rail vehicle. Alternatively, the brake pad can be a brake pad for a road vehicle, a brake pad for a stationary machine with a rotor (such as a wind turbine), or a brake pad for an industrial machine.

[0009] The liner support can be shaped to connect to the brake head, for example, via a pin configured to pass through at least one hole provided in the liner support. The liner support may comprise a plate, for example, made of metal. In some cases, the plate includes at least one curved region formed by two shoulders, thereby creating the space between the liner support and the liner mounting surface. Advantageously, the curved region may have a hole in each shoulder. Such a hole allows the pin of the brake head to pass through. The pin can be mounted to be translatably movable between a first position and a second position. In the first position, the pin passes through the hole in the liner support, thereby securing the liner to the brake head. In the second position, the pin is not in the hole in the liner support, thereby separating the liner from the brake head, which allows for liner replacement.

[0010] Particles collected in the at least one collection tank can be generated during vehicle braking, in which the liner comes into contact with an element rotating about a rotation axis. Specifically, the liner may include a face, called a friction face, which faces the mounting surface in a direction substantially perpendicular to the friction face. This friction face is designed to contact the rotating element during vehicle braking. The friction face and the rotating element therefore wear during braking, resulting in the release of particles, typically contaminant particles generated by the wear of the friction face and the rotating element. These particles can be collected in the at least one collection tank.

[0011] The at least one collection tank can therefore reduce the amount of particles released into the environment due to wear of the liner and rotating elements.

[0012] In some cases, the at least one collection trough is fully open on the friction surface of the liner. In other cases, the at least one collection trough comprises a first portion and a second portion, the first portion being open on the friction surface and the second portion being covered by the friction material of the friction surface. Because the second portion of the at least one collection trough is covered by the friction material, it is only opened on the friction surface after the friction material covering it has been completely worn away by the wear of the liner that contacts the rotating element during the braking phase. Specifically, the second portion of the at least one collection trough is initially embedded in the liner. As the friction surface of the liner wears away due to contact with the rotating element, the second portion of the collection trough is exposed and opened on the friction surface. This prevents the second portion of the collection trough from being open on the friction surface before the liner wear level reaches a level sufficient to close the second portion of the at least one collection trough during the braking phase. This reduces the risk that particles generated by the wear of the braking liner and the rotating element and collected in the at least one collection trough may escape from the second portion of the collection trough before being drawn away by the negative pressure source. The collection and suction efficiency of these particles is thus improved because fewer particles are lost compared to when the collection trough was initially fully open on the friction surface.

[0013] The liner also includes a leading edge and a trailing edge, as well as an axially inner edge and an axially outer edge extending between the leading edge and the trailing edge. In some cases, at least one of the axially inner edge or the axially outer edge is a chamfered edge.

[0014] In this article, "axial" should be understood as a direction substantially parallel to the axis of rotation of the rotating element, while "radial" should be understood as any direction substantially perpendicular to the axis of rotation of the rotating element.

[0015] In one example, the second portion of the at least one collection slot is at least partially located below the chamfered edge. In another example, the entire second portion of the at least one collection slot is located below the chamfered edge.

[0016] The rotating element is, for example, a wheel of a rail vehicle. Alternatively, the rotating element can be a brake disc. The radially outer surface of the rotating element may have a basic truncated conical shape. Specifically, the diameter of the rotating element may gradually increase between the axially inner end face and the axially outer end face of the rotating element.

[0017] The suction port of the at least one groove can lead directly or indirectly to a suction pipe. In a non-limiting example, the suction port is located at one end of the at least one collection groove. This concentrates the suction of particles at that end. Furthermore, particles collected in the at least one collection groove can be suctioned from a single suction port. This facilitates the manufacture of the liner and reduces its size.

[0018] A negative pressure source is, for example, a particle suction system. A connecting device, such as a flexible hose, connects the negative pressure source to the suction port.

[0019] The sealed chamber may include a sealing body and a suction conduit. In a non-limiting example, the sealing body is at least partially disposed in the space between the liner support and the liner mounting surface, and the suction conduit protrudes from this space.

[0020] The suction pipe can be connected to the sealing body. Furthermore, the suction pipe can be designed to be in fluid communication with a negative pressure source. Specifically, one end of the connecting device can be connected to the suction pipe, and the other end can be connected to the negative pressure source. Advantageously, the outer surface of the suction pipe may include at least one annular protrusion. This secures the connection between the connecting device and the suction pipe.

[0021] Advantageously, when the sealing chamber is installed in the space between the liner support and the liner mounting surface, the at least one hole in the liner support for allowing the pin to pass through is not blocked by the sealing chamber. Therefore, the liner can still be connected to the brake head by inserting a pin into the at least one hole in the liner support. Thus, the presence of the sealing chamber does not alter the liner maintenance operation; the liner can be replaced when the pin is removed from the at least one hole in the liner support and the connecting device is disconnected from the suction pipe. Furthermore, as described above, this chamber can be installed in existing liners without altering their geometry or dimensions.

[0022] The sealing chamber can be an additional component inserted into the space between the liner support and the liner mounting surface. The advantage of this configuration is that it does not require modification to the method of assembling the liner to the liner support. Alternatively, the sealing chamber can be integrated into the liner support and / or the liner itself. This avoids the need for means to hold the sealing chamber in position within the space between the liner support and the liner mounting surface.

[0023] The sealed chamber is advantageously connected in a sealing manner to the liner of the liner, thereby connecting to each collection slot of the liner. The seal between the chamber and the liner (and with each collection slot) can be established, for example, by a layer of rubber or putty, by molding the liner onto the chamber, or by an O-ring installed between the suction port and the chamber.

[0024] According to one aspect, the sealed chamber is welded to the liner support and / or the liner.

[0025] This configuration allows the chamber to be installed in the space between the liner support and the mounting surface without modifying the structure of the liner support or the liner. Therefore, the sealing chamber can be installed on an existing liner block that includes the space between the liner support and the liner mounting surface. Furthermore, no additional components are required to hold the sealing chamber in position within the space between the liner support and the liner mounting surface.

[0026] For welding, the sealing body may include, for example, a housing made of metal. The housing may define a recess within the sealing body. The housing may be welded to a face of a liner support positioned facing the liner mounting surface. Therefore, a weld seam appears between the liner support and the sealing chamber.

[0027] If the sealed chamber is welded to the liner, the liner may advantageously include a metal area for welding.

[0028] According to one aspect, the liner may further include connecting means for connecting the sealing chamber to the liner support and / or the liner. Therefore, the sealing block is reliably connected to the liner support and / or the liner.

[0029] The connecting device can be non-removable or removable. For example, the connecting device can be a screw. To connect the chamber to the liner support via the connecting device, the sealing body may include a cavity having an internal thread complementary to the external thread of the connecting device. Furthermore, the liner support may include a hole aligned with the cavity of the sealing body and shaped to receive the connecting device. Thus, the sealing chamber can be connected to the liner support via the connecting device, holding it in position within a space provided between the liner support and the liner mounting surface.

[0030] It should be noted that the sealing chamber designed to be connected to the liner support via a connecting device may, in other respects, include the same elements as the sealing chamber designed to be welded to the liner support and / or the liner. However, it should be noted that, in order to avoid increasing the size of the sealing chamber, the recess of the aforementioned housing may be smaller than when the sealing chamber is welded.

[0031] According to one aspect, the sealing chamber is press-fitted into the space provided between the liner support and the liner mounting surface. This configuration also allows the chamber to be installed in the space between the liner support and the mounting surface without modifying the structure of the liner support or the liner. Therefore, the sealing chamber can be installed in an existing liner block that includes the space between the liner support and the liner mounting surface. Furthermore, no additional components are required to hold the sealing chamber in position within the space between the liner support and the liner mounting surface.

[0032] Specifically, the sealing chamber can contract and fit within the space between the liner support and the liner mounting surface. For this purpose, the chamber is initially sized to prevent insertion into this space. The chamber, or at least its sealing body, is then cooled. This cooling process causes the sealing chamber to contract, allowing it to easily insert into the space between the liner support and the liner mounting surface. The temperature of the sealing chamber is then gradually increased until it reaches thermal equilibrium with its environment, particularly with the liner support and the mounting surface. This increase in temperature causes the chamber to gradually return to its original shape and size. The sealing chamber is then tightly held between the liner support and the liner, forming a seal.

[0033] According to one aspect, the sealed chamber may include a nut welded to a liner support and / or a liner. The nut includes an inner annular surface having an internal thread complementary to an external thread on the outer surface of the suction conduit. Therefore, the suction conduit can be connected to the nut via the engagement of the external thread on the outer surface of the suction conduit with the internal thread within the nut.

[0034] To weld the nut to the liner support, a wall substantially perpendicular to the suction pipe can be obtained by bending the plate of the liner support or by welding such a wall to the liner support.

[0035] In some cases, to improve the seal between the sealing body and the suction pipe, a sealing component, such as an O-ring, can be provided at the end of the suction pipe received in the sealing body.

[0036] According to one aspect, the sealed chamber may include a filling block comprising a cavity that fluidly connects the suction port of the at least one collection tank to a suction conduit.

[0037] The filler block can be installed in the recess of the housing. The filler block can occupy the entire recess defined by the housing. The cavity of the filler block extends, for example, between the suction port and the suction channel, thereby establishing a fluid connection between the suction port and the suction channel.

[0038] The filler block can also be obtained after the liner is molded onto the liner support.

[0039] According to one aspect, the filler block may be made of a friction material of silicone and / or a liner.

[0040] When the filler block is made of the friction material of the liner, the filler block can be obtained while the liner is being molded onto the liner support.

[0041] According to one aspect, the sealing chamber can be formed as a single unit with the liner support. This eliminates the need for additional components or steps to connect the sealing chamber to the liner support during liner assembly.

[0042] According to one example, the plate used to form the liner support can be designed to bend to form a sealing body of a sealed chamber.

[0043] According to another example, at least one wall may be welded to the liner support, the wall extending substantially perpendicular to the suction conduit. For example, two walls substantially perpendicular to the suction conduit may be welded to the liner support to form a single unit. When the liner is molded onto the liner support, the cavity formed between these walls and the liner support may be filled with the friction material of the liner.

[0044] According to another aspect, a method for assembling the aforementioned brake pad is proposed, the method comprising: - Provides liner, liner support and sealing chamber; - Connect the liner support to the liner mounting surface; - The sealed chamber is arranged in the space between the liner support and the liner mounting surface, such that the suction hole of the at least one particle collection tank leads to the sealed chamber and is in fluid communication with the suction pipe.

[0045] Therefore, the assembly method for this brake pad is simple. Specifically, this method allows for the installation of a sealed chamber without modifying the brake head, a very complex operation in the case of rail vehicle braking systems. Consequently, the seal established between the suction port, suction pipe, and negative pressure source is easily achieved.

[0046] According to one aspect, the sealed chamber can be arranged in the space by at least one of the following techniques: - Weld the sealed chamber to the liner support and / or the liner; and / or - Connect the sealed chamber to the liner support and / or the liner via a connecting device; and / or - The sealed chamber is fitted between the liner support and the liner; and / or - The liner is molded onto the assembly, which includes the liner support and the suction pipe.

[0047] It should be noted that several of these technologies can be combined in the same brake pad to arrange the sealing chamber in the space between the pad support and the pad mounting surface. For example, the same chamber can be both welded to the pad support and secured to it via a connecting device. This helps to better ensure that the sealing chamber remains in position within the space between the pad support and the pad mounting surface.

[0048] Advantageously, when the chamber comprises a housing surrounding a recess occupied by a filler block, and the chamber is connected to the liner support and / or liner by welding or connecting means, the filler block is installed in the recess before the sealing block is connected to the liner and / or liner support. In embodiments where the chamber is connected to the liner support and / or liner by welding or connecting means, the liner support can be connected to the mounting surface of the liner first, and then the sealing chamber is installed in the space between the liner support and the mounting surface. In these examples, the chamber can also be connected to the liner support and / or liner first (by welding or connecting means), and then the liner support can be connected to the mounting surface of the liner. In this case, the step of connecting the liner support to the mounting surface is performed simultaneously with the step of arranging the chamber in the space between the liner support and the mounting surface.

[0049] In embodiments where the liner is molded onto an assembly including a liner support and a suction conduit, the step of arranging the chamber in space is also performed simultaneously with the step of connecting the liner support and the liner. Attached Figure Description

[0050] Other features, details, and advantages will be apparent from the following detailed description and from the analysis of the accompanying drawings, wherein: Figure 1 【 Figure 1 This image shows a schematic perspective view of a braking system according to an exemplary embodiment.

[0051] Figure 2 【 Figure 2 [Showing] Figure 1 A schematic side view of the braking components of a braking system.

[0052] Figure 3 【 Figure 3 [This illustrates an exemplary embodiment.] Figure 1 A schematic perspective view of the brake pads of a braking system.

[0053] Figure 4 【 Figure 4 [This shows the view from the first angle] Figure 3 A schematic perspective view of a liner block equipped with a sealed chamber.

[0054] Figure 5 【 Figure 5 This shows an observation from a second perspective. Figure 3 A schematic perspective view of a liner block equipped with a sealed chamber.

[0055] Figure 6 【 Figure 6 The image shows a representation according to the first embodiment. Figure 3 Schematic perspective view of the axial cross-section of the liner and sealing chamber.

[0056] Figure 7 【 Figure 7 [Illustrated according to the second embodiment] Figure 3 Schematic perspective view of the axial cross-section of the liner and sealing chamber.

[0057] Figure 8 【 Figure 8 [Illustrated according to the third embodiment] Figure 3 Schematic perspective view of the axial cross-section of the liner and sealing chamber.

[0058] Figure 9 【 Figure 9 [Illustrated according to the fourth embodiment] Figure 3 Schematic perspective view of the axial cross-section of the liner and sealing chamber.

[0059] Figure 10 【 Figure 10 [Illustrated according to the fifth embodiment] Figure 3 Schematic perspective view of the axial cross-section of the liner and sealing chamber.

[0060] Figure 11 【 Figure 11 [This section shows the implementation of the sixth embodiment.] Figure 3 Schematic perspective view of the axial cross-section of the liner and sealing chamber.

[0061] Figure 12 【 Figure 12 [A schematic perspective view of the seventh embodiment is shown.]

[0062] Figure 13 【 Figure 13 The diagram shows the eighth embodiment.

[0063] Figure 14 【 Figure 14 The diagram shows the ninth embodiment. Detailed Implementation

[0064] Figure 1 An example of a braking system 10 for vehicles, particularly rail transport vehicles (trains, trams, subways, etc.) is shown. The braking system 10 includes a rotating element 12 and a braking assembly 14.

[0065] The rotating element 12 corresponds to the part of the vehicle whose translational motion is caused by the rotational motion of the element 12 about the axis of rotation. In this example, the rotating element 12 is the vehicle's wheel, configured to rotate about the axis of rotation A, but this is not a limitation.

[0066] Advantageously, the radially outer surface 16 of the wheel 12 has a substantially truncated conical shape. Specifically, the diameter of the wheel 12 gradually increases between the axially inner end face 13A and the axially outer end face 13B of the wheel 12. Herein, the axial direction corresponds to any direction substantially parallel to the axis of rotation A, and the radial direction corresponds to any direction substantially perpendicular to the axis of rotation A. This truncated conical shape of the radially outer surface 16 ensures that the wheel 12 self-centers during vehicle translational motion and reduces the risk of derailment on its path curve.

[0067] like Figure 1 As shown, the wheel 12 may also include a flange 17 that projects radially from the axial inner end face 13A of the wheel 12. This flange 17 also reduces the risk of vehicle derailment.

[0068] Brake assembly 14 includes brake pad 18, also known as a wear plate or brake shoe. Pad 18 includes a liner 20 made of friction material. Liner 20 includes a first surface, called friction surface 22A, which is arranged radially toward the radially outer surface 16 of the wheel. Friction surface 22A is generally curved.

[0069] As described in more detail below, friction surface 22A is intended to contact the radial outer surface 16 of wheel 12 during vehicle braking.

[0070] The liner 20 includes a second surface 22B, referred to as the mounting surface, which is opposite to the friction surface 22A. Specifically, the friction surface 22A and the mounting surface 22B are opposite to each other in the axial direction.

[0071] The liner 20 also includes an axial inner edge 22C, an axial outer edge 22D, a leading edge 22E, and a trailing edge 22F. Edges 22C, 22D, 22E, and 22F extend radially between the friction surface 22A and the mounting surface 22B.

[0072] The inner axial edge 22C and the outer axial edge are opposite each other in the axial direction. These inner and outer axial edges 22C, 22D connect the leading edge 22E and the trailing edge 22F.

[0073] like Figure 1 and 3 As shown, the axial inner edge 22C can be chamfered.

[0074] The leading edge 22E and the trailing edge 22F are defined relative to the rotational direction of wheel 12. Figure 1 In the example, assume wheel 12 rotates about axis A in direction R. Leading edge 22E corresponds to the edge of liner 20 first seen by a specific imaginary point P on wheel 12 when it rotates about its axis of rotation A in direction R, while trailing edge 22F corresponds to the edge of liner 20 last seen by a specific point P when it rotates about its axis of rotation A in direction R. Of course, the direction of rotation R can be... Figure 1 Conversely, this would reverse the positions of the leading edge 22E and the trailing edge 22F.

[0075] As described in more detail below, the liner 20 includes at least one particle collection trough.

[0076] Braking assembly 14 may include pad support 24, particularly Figure 2 As can be seen, the liner support 24 may include, for example, a plate 25 made of metal. The liner support 24 is directly or indirectly connected to the mounting surface 22B of the liner 20.

[0077] Plate 25 may include at least one curved region 26, in Figure 3 and 4As can be seen in the image. In this example, the curved region 26 includes a first shoulder 26A and a second shoulder 26B opposite to each other. The first shoulder 26A includes a hole 27A, and the second shoulder includes a hole 27B. Preferably, holes 27A and 27B are aligned with each other.

[0078] like Figure 3 As shown, when the liner support 24 is connected to the mounting surface 22B, the bending region 26 protrudes from the rest of the plate that contacts the mounting surface 22B. Therefore, a space 29 exists between the liner support 24 and the mounting surface 22B of the liner 20. This space is defined between the bending region 26 of the plate and the mounting surface 22B of the liner 20.

[0079] The braking assembly 14 may also be equipped with a brake head 28. The brake head 28 is connected to the pad support 24. Specifically, as Figure 2 As shown, the brake head 28 may include a pin 31. The pin 31 is shaped to pass through holes 27A and 27B provided in the liner support 24. Specifically, the pin 31 can be mounted to be translatably movable between a first position, in which it passes through holes 27A and 27B in the liner support 24, and in the second position, the pin 31 is not within holes 27A and 27B. Therefore, in the first position of the pin 31, the liner 18 is fixed to the brake head 28, while in the second position of the pin 31, the liner 18 can be detached from the brake head 28, for example, so that it can be replaced by another liner 18.

[0080] Braking assembly 14 is configured to move brake head 28, thereby moving pad 18. During vehicle braking, braking assembly 14 is configured to move pad 18 in a direction that brings pad 18 closer to wheel 12 until friction surface 22A contacts the radial outer surface 16 of wheel 12, such as... Figure 3 As shown. Once the braking phase ends, the braking assembly 14 is configured to move the brake pad 18 away from the wheel 12, thereby stopping the contact between the friction surface 22A and the radially outer surface 16 of the wheel 12. In fact, outside the braking phase, the brake pad 18 and the wheel 12 are separated from each other, as... Figure 1 As shown.

[0081] When the friction surface 22A of the liner 18 contacts the radial outer surface 16 of the wheel 12 during the braking phase, the wheel 12 is rotating about axis A. Therefore, frictional force is generated between the friction surface 22A and the radial outer surface 16, causing wear on both the liner 20 of the liner 18 and the radial outer surface 16 of the wheel 12. Consequently, particles, typically contaminant particles, are formed through the friction material of the liner 20 and the wear of the wheel 12. During this wear, the friction surface 22A of the liner 20 is reshaped to conform to the radial outer surface 16 of the wheel 12.

[0082] As described above, the liner 20 includes at least one particle collection trough.

[0083] Each collection trough is partially open at least on the friction surface 22A, as described in detail below. Each collection trough extends in the depth direction between the friction surface 22A and the mounting surface 22B. Each collection trough is preferably blind at the end opposite the opening on the friction surface 22A. Furthermore, each collection trough is shaped to collect contaminant particles generated by the wear of the liner 20 and the wheel 12, thereby preventing these particles from being released into the environment.

[0084] Figure 5 A non-limiting example of the arrangement of collection channels in a liner 20 is shown. Specifically, the liner 20 includes a first main collection channel 30, a second main collection channel 32, a secondary collection channel 38, a first transverse collection channel 40, and a second collection channel 42. As described below, all these channels 30, 32, 38, 40, and 42 are advantageously in fluid communication with each other, thereby forming a single continuous collection channel.

[0085] The first main collection tank 30 is arranged near the leading edge 22E. For example, the first main collection tank 30 is substantially parallel to the leading edge 22E. The second main collection tank 32 is arranged near the trailing edge 22F. For example, the second main collection tank 32 is substantially parallel to the trailing edge 22F. In this document, "near the leading / trailing edge" should be understood as "the distance from the leading / trailing edge is less than or equal to 30% of the distance between the leading and trailing edges, preferably less than or equal to 15% of the distance between the leading and trailing edges".

[0086] The presence of the main collection tanks 30 and 32 near the leading edge 22E and trailing edge 22F ensures that pollutant particles can be collected regardless of the rotation direction of the wheel 12.

[0087] Advantageously, each main collection channel 30, 32 may include a first portion and a second portion, the first portion being open on the friction surface 22A, and the second portion being covered by the friction material of the friction surface 22A. Thus, the second portion of each channel 30, 32 is embedded in the liner when the liner 18 is new or only slightly worn. Once the liner 18 reaches a certain wear level, the second portion of each main collection channel 30, 32 is exposed, i.e., it also opens on the friction surface 22A. The second portion of each main collection channel 30, 32 may be located below the chamfered edge 22C, but this is not a limitation. Alternatively, a portion of the second portion may be embedded under the friction material of the friction surface 22A, and the remainder of the second portion may be embedded under the chamfered edge 22C.

[0088] The secondary collection trough 38 is located between the first primary collection trough 30 and the second primary collection trough 32. In a non-limiting example, the secondary collection trough 38 is located at the center of the liner. "Central location" as used herein should be understood as a position substantially equidistant between the leading edge 22E and the trailing edge 22F of the liner 20. Of course, the secondary collection trough 38 may be closer to either the leading edge 22E or the trailing edge 22F than the other.

[0089] The secondary collection trough 38 may extend substantially parallel to the main collection troughs 30 and 32, but this is not a limitation. For example, the secondary collection trough may extend substantially parallel to only one of the two troughs 30 and 32, or in a direction not parallel to the main collection troughs 30 and 32.

[0090] like Figures 6 to 10 As shown, the secondary collection trough 38 may include a first portion 38-1 and a second portion 38-2. The first portion is open on the friction surface 22A, and the second portion is covered by the friction material. The second portion 38-2 of the secondary collection trough 38 may be completely located below the chamfered edge 22C. Alternatively, a portion of the second portion 38-2 of the secondary collection trough 38 may be embedded under the friction material of the friction surface 22A, while the remaining portion of the second portion 38-2 of the secondary collection trough 38 may be embedded under the chamfered edge 22C. Once the liner 18 reaches a certain wear level, the second portion 38-2 of the secondary collection trough 38 is exposed, meaning it also opens on the friction surface 22A.

[0091] In some cases, even when the liner 18 is brand new, the secondary collection groove 38 is fully open on the friction surface 22A. In this case, the secondary collection groove 38 is advantageously shorter; for example, it does not extend into the portion of the chamfered edge 22C.

[0092] It should be noted that, although Figure 5 Only one secondary collection tank 38 is shown, but the liner 20 may include multiple secondary collection tanks 38 as described above.

[0093] The presence of the main collection grooves 30, 32 and the secondary collection groove 38 provides the advantage that, regardless of the radius of curvature of the brake pad friction surface 22A, contact between the friction surface 22A and the wheel 12 during braking occurs when facing one of the grooves 30, 32, or 38. Therefore, more contaminant particles emitted due to wear of the brake pad 18 and the wheel 12 can be collected into the grooves 30, 32, or 38. Furthermore, as mentioned above, the presence of the main collection grooves 30, 32 near the leading edge 22E and the trailing edge 22F ensures that contaminant particles are collected regardless of the rotation direction of the wheel 12.

[0094] The first transverse collection tank 40 fluidly connects the first main collection tank 30 and the secondary collection tank 38. Figure 5 In a non-limiting example, the first transverse collection channel 40 extends between one end of the first main collection channel 30 located next to the axial outer edge 22D of the liner 20 and one end of the secondary collection channel 38 located next to the chamfered edge 22C. Therefore, the first transverse collection channel 40 extends obliquely between the first main collection channel 30 and the secondary collection channel 38.

[0095] The second transverse collection tank 42 fluidly connects the second main collection tank 32 and the auxiliary collection tank 38. Figure 5In a non-limiting example, the second transverse collection channel 42 extends between one end of the second main collection channel 32 located next to the axial outer edge 22D of the liner 20 and the end of the secondary collection channel 38 located next to the chamfered edge 22C. Therefore, the second transverse collection channel 42 extends obliquely between the second main collection channel 32 and the secondary collection channel 38.

[0096] In this document, when the transverse collection channels 40 and 42 are referred to as extending "inclined," it should be understood that they form a non-zero, non-right-angle angle with each of the channels to which they are connected. In this example, the first transverse collection channel forms a non-zero, non-right-angle angle with the first main collection channel and the secondary collection channel, while the second transverse collection channel forms a non-zero, non-right-angle angle with the second main collection channel and the secondary collection channel.

[0097] The first transverse collecting groove 40 and the second transverse collecting groove 42 are advantageously open on the friction surface 22A. Figure 7 In a non-limiting example, the first and second transverse collection channels 40, 42 are open along their entire length on the friction surface 22A. However, each of the first and second transverse collection channels 40, 42 may also have an embedded portion.

[0098] Due to the presence of the transverse collection troughs 40 and 42, the entire length of the liner 20 between the main collection troughs 30 and 32 is traversed by at least one particle collection trough. This increases the surface area of ​​the liner occupied by the collection trough, thereby increasing the amount of pollutant particles collected in the trough and thus not released into the environment.

[0099] The fact that the first and second lateral collection grooves 40, 42 extend obliquely is also advantageous. Specifically, as described above, during the braking phase, the wear of the radial outer surface 16 of the wheel 12 and the liner 20 occurs simultaneously. During braking, the portion of the radial outer surface 16 of the wheel 12 that directly faces one of the collection grooves at any given time does not experience wear. In fact, each collection groove forms a recess in the friction surface 22A. Therefore, each collection groove prevents frictional force from being generated between the friction surface 22A and the radial outer surface 16 of the wheel 12. If the lateral collection grooves 40, 42 are connected in a direction tangential to the portion of the radial outer surface 16 that contacts the liner 20 during the braking phase, the annular portion of the radial outer surface 16 of the wheel 12 will never come into contact with the friction material of the friction surface 22A. Ultimately, the radial outer surface 16 of the wheel 12 will have excessive thickness in this annular portion relative to the rest of the radial outer surface 16 of the wheel 12. This excessive thickness may damage the track on which the wheel 12 travels and / or may cause the vehicle to derail. In this example, due to the inclined lateral collection grooves 40, 42, the contact time of any portion of the radial outer surface 16 of the wheel 12 is ensured to be negligible compared to the contact time of that portion with the friction material of the liner 20. Therefore, the wheel 12 wears evenly, thereby preventing the formation of excessively thick areas on its radial outer surface 16.

[0100] certainly, Figure 5 The shape of the collection trough in the liner 20 provided is not limited. Other shapes of collection troughs may be considered.

[0101] like Figures 6 to 10 As shown, the secondary collection tank 38 includes a suction port 44 leading to a sealed chamber 50, which will be described in detail below. The collection tank formed by the main collection tanks 30, 32, the transverse collection tanks 40, 42 and the secondary collection tank 38 thus leads to the sealed chamber 50.

[0102] Suction port 44 is intended to be connected to a negative pressure source (not shown). The negative pressure source is, for example, a particle suction system. Connecting device 45 (in...) Figure 1 (As can be seen in the image) A negative pressure source can be connected to the suction port 44 via a sealed chamber. Therefore, particles collected in the collection tanks 30, 32, 38, 40, and 42 can be drawn in. The connecting device 45 includes, for example, a pneumatic hose.

[0103] Preferably, the suction hole 44 is arranged at one end of the secondary collection tank 38. This concentrates the suction of particles at that end.

[0104] Now refer to Figures 4 to 11 Describe the sealed chamber 50.

[0105] The sealed chamber 50 includes a sealing body 51 and a suction pipe 52.

[0106] The sealed chamber 50 is arranged in the space 29 between the liner support 24 and the mounting surface 22B of the liner 20. Specifically, as Figure 4 As shown, the sealing body 51 is at least partially arranged in the space 29.

[0107] like Figure 4 As shown, the suction pipe 52 protrudes from the sealing body 51 and the space 29. The suction pipe 52 is connected to the sealing body 51.

[0108] The suction pipe 52 is designed to be in fluid communication with a negative pressure source. Specifically, as... Figure 1 As shown, the connecting device 45 can be connected to the suction pipe 52. More specifically, one end of the connecting device 45 is connected to the suction pipe 52, while the other end of the device 45 is connected to a negative pressure source. Figure 4 and 5 As shown, the outer surface of the suction conduit 52 may include at least one annular protrusion 54. In this example, three annular protrusions 54 are provided on the outer surface of the suction conduit, but this is not a limitation. Such annular protrusions secure the connection between the connecting device 45 and the suction conduit 52.

[0109] Advantageously, when the sealing chamber 50, particularly its body 51, is installed in the space 29, the holes 27A and 27B are not blocked by the sealing chamber 50. Therefore, the liner 18 can always be connected to the brake head 28 by inserting the pin 31 into the holes 27A and 27B. Thus, the presence of the chamber 50 does not change the maintenance operation of the liner 18, which can be replaced when the pin 31 is removed from the holes 27A and 27B and the connecting device 45 is disconnected from the suction pipe 52.

[0110] like Figures 6 to 11 As shown, the sealed chamber 50 can have different shapes. Figures 6 to 8 In the middle, the sealed chamber 50 is a component added to the space 29, while Figures 9 to 11 In this case, the sealed chamber 50 is integrated into the liner support 24 and / or the liner 22, as described below.

[0111] Now will describe Figures 6 to 8 An example of a sealed chamber.

[0112] exist Figure 6 In the example, the sealing body 51 includes a housing 56. The housing 56 is advantageously made of metal. The housing 56 defines a recess 58 in which a filler block 60 is provided.

[0113] In one example, filler block 60 is made of silicone, but other materials are possible. For example, filler block 60 may be made of rubber that meets the fire and smoke protection requirements for railway applications. For example, filler block 60 may be made of NBR rubber, which provides improved heat resistance. Filler block 60 preferably fills the entire recess 58. Figure 6 As shown, the filling block 60 includes a cavity 62. The cavity 62 extends between the suction port 44 and the suction conduit 52, thereby allowing fluid communication between the suction port 44 and the suction conduit 52.

[0114] In order to hold the sealed chamber 50 in position within the space 29, Figure 6 In this example, the sealed chamber 50 is welded to the liner support 24. Specifically, the housing 56 may be welded to a face of the liner support 24 positioned facing the mounting surface 22B of the liner 20. Therefore, a weld 64 appears between the liner support 24 and the chamber 50.

[0115] Advantageously, it should be noted that the filler block 60 is installed in the recess 58 of the housing 56 before the housing 56 is welded to the liner support 24. It should also be noted that in some cases, the chamber 50 may be without the filler block 60, and the seal between the suction port 44 and the suction conduit 52 is achieved through the housing 56.

[0116] therefore, Figure 6 This configuration allows the sealed chamber 50 to be installed in the space 29 without modifying the liner support 24 or the liner 20. Therefore, according to Figure 6 The example welded chamber 56 has the advantage of being able to be mounted on an existing liner that contains the space between the liner support 24 and the mounting surface 22B of the liner 20.

[0117] Figure 7 Examples and Figure 6 The difference lies in that the sealed chamber 50 is connected to the liner support 25 via a connecting device 66 instead of a weld 64. The connecting device 66 may be, for example, a screw, particularly a pressure screw that is screwed into the liner support 24 (which may have internal threads) and abuts against the outside of the chamber 50. Alternatively, the connecting device 66 may be a gasket that abuts against the liner support 24 and is screwed onto the chamber 50, or a gasket that is press-fitted between the liner support 24 and the chamber 50.

[0118] To connect the chamber 50 to the liner support 25 via the connecting device 66, the sealing body 51 may include a cavity 68 containing an internal thread complementary to the thread of the connecting device 66. Figure 7 (Not shown in the image). Furthermore, the liner support 24 includes a hole 70 aligned with the cavity 68 of the sealing body 51 and shaped to receive the connecting device 66. Therefore, the chamber 50 can be connected to the liner support 24 via the connecting device 66, holding it in position within the space 29.

[0119] Figure 7 The chamber 50 includes [missing information - likely related to a specific type of chamber]. Figure 6 The chamber 50 contains the same components. These components are in... Figure 7 Zhongyu Figure 6The same reference numerals are used in the figures and will not be described further below for the sake of brevity. However, it should be noted that, in order to avoid increasing the size of the chamber 50, the recess 58 and therefore the filling block 60 (if provided) are comparable. Figure 6 The example is smaller.

[0120] like Figure 6 Similarly, advantageously, the filler block 60 is installed in the recess 58 of the housing 56 before the housing 56 is connected to the liner support 24 via the connecting device 66. Figure 6 Similarly, recess 58 may also be without filler block 60.

[0121] exist Figure 8 In the example, chamber 50 is press-fitted into space 29. Specifically, chamber 50 can be retracted into space 29. For this purpose, before insertion into space 29, chamber 50, particularly its body 51, has dimensions that prevent its insertion into space 29. Chamber 50, or at least its body 51, is then cooled. This cooling process causes chamber 50 to shrink, making it easy to insert into space 29. The temperature of chamber 50 is then gradually increased until it reaches thermal equilibrium with its environment, particularly with liner support 24 and mounting surface 22B. This temperature increase causes chamber 50 to gradually return to its original shape and size. Thus, chamber 50 is clamped between liner support 24 and liner 20. Specifically, chamber 50 is tightly clamped to form a seal between liner support 24 and mounting surface 22B of liner 20.

[0122] therefore, Figure 8 This configuration allows the sealed chamber 50 to be installed in the space 29 without modifying the liner support 24 or the liner 20.

[0123] For the sake of brevity, Figure 8 In the illustrated embodiments, and Figure 6 and 7 Identical or similar components share the same numbering, and will not be described in detail below. It should only be noted that... Figure 8 In the example, the recess 58 of the housing 56 does not have a filler block 60, but it may include such a filler block 60.

[0124] Now will describe Figures 9 to 11 Example of a sealed chamber 50.

[0125] exist Figure 9 In this example, the sealing chamber 50 and the liner support 24 are formed as a single unit. Specifically, the plate used to form the liner support 24 is designed to be flexible to form the sealing body 51. The sealing body 51 includes a first wall 51-1 and a second wall 51-2 that are substantially perpendicular to the suction conduit 52 and located between the first shoulder 26A and the second shoulder 26B. The suction conduit 52 is supported, for example, by the second wall 51-2.

[0126] In this example, the sealing body 51 may further include a third wall 51-3 connecting the first wall and the second walls 51-1, 51-2 and substantially parallel to the mounting surface 22B. The third wall 51-3 may include a hole 72 arranged in fluid communication with the hole 44 of the liner 20. The third wall 51-3 may also include at least one hole 74 for retaining the liner 20.

[0127] Recess 76, similar to recess 58 described above, is formed between the liner support 24, the first wall 51-1, the second wall 51-2, and the third wall 51-3. In the figure, recess 76 is empty, but it may also include, for example... Figure 6 and 7 The filler block 60 shown, or the filler block 60 made of the friction material of the liner 20. Both the suction channel 52 and the suction hole 44 open into the recess 58 so that they are in fluid communication with each other.

[0128] In this example, the liner 20 is molded onto a liner support 24 forming a single unit with a cavity 50. This molding results in the holes 72 and at least one hole 74 of the cavity 50 being at least partially filled with the friction material of the liner 20. By introducing the friction material of the liner 20 into the holes 72 and at least one hole 74, the adhesion of the liner 20 to the liner support 24 is improved.

[0129] It should be noted that, in order to prevent the recess 76 from being filled with friction material during the molding of the liner 20, the recess 76 is sealed during the molding of the liner 20. Therefore, the recess 76 allows fluid communication between the suction port 44 and the suction channel 52 without the need to machine an additional cavity.

[0130] Similarly, it should be noted that, in order to prevent the portion of space 29 located outside chamber 50 from being filled with friction material during the molding of liner 20, this portion of space 29 is sealed during the molding of liner 20. Therefore, after liner 20 is molded, the holes 27A, 27B of liner support 24 can freely receive the pin 31 of brake head 28.

[0131] In this configuration, the amount of material required to manufacture the liner 18 is reduced because the recess 76 is not filled with friction material.

[0132] exist Figure 10 In the example, the first wall 78-1 and the second wall 78-2 are welded to the liner support 24. Therefore, the liner support 24, the first wall 78-1, and the second wall 78-2 form a single unit. In other words, they are made as a single piece.

[0133] The first and second walls 78-1, 78-2 extend substantially perpendicular to the suction pipe 52. The suction pipe 52 is supported by the second wall 78-2. A recess 80 is formed between the liner support 24 and the first and second walls 78-1, 78-2.

[0134] The liner 20 is molded onto an assembly including the liner support 24, the first and second walls 78-1, 78-2, and the suction conduit 52. During molding, the recess 80 is filled with the friction material of the liner 20, thereby establishing a seal in the recess 80. Therefore, the sealing body 51 in this case includes the walls 78-1, 78-2 and the friction material of the liner 20 filling the recess 80. To establish fluid communication between the orifice 44 and the suction conduit 52, the aforementioned cavity 62 is machined through the friction material filling the recess 80.

[0135] like Figure 9 As in the example, to prevent the portion of space 29 located outside chamber 50 from being filled with friction material during the molding of liner 20, that portion of space 29 is sealed during the molding of liner 20. Therefore, after liner 20 is molded, the holes 27A, 27B of liner support 24 can freely receive the pin 31 of brake head 28.

[0136] Figure 11 Another example of a sealed chamber 50 is shown. In this case, the plate of the liner support 24 is bent to form a wall 82 substantially perpendicular to the suction conduit 52. Alternatively, the wall 82 may be welded to the liner support 24. The wall 82 is passed through the suction conduit 52. A nut 84 is welded to the liner support 24. Figure 11 As shown, nut 84 is welded to wall 82, for example.

[0137] The nut 84 includes an inner annular surface having an internal thread (not shown) that is complementary to the external thread (not shown) provided on the outer surface of the suction conduit 52. Thus, the suction conduit 52 is connected to the chamber 50 by the engagement of the threads of the suction conduit 52 with the threads of the nut.

[0138] In this case, the sealing body 51 therefore includes a wall 82 and a nut 84. Furthermore, as... Figure 11 As shown, the sealing body 51 includes a filler block 60 formed of the friction material of the liner 24. This filler block 60 can be obtained after the liner 24 is molded onto the liner support 24 connected to the wall 82, nut 84, and pipe 52. To obtain this filler block 60, during the molding of the liner 20, a portion of the space 29 is sealed, while another portion remains accessible to the friction material of the liner 20.

[0139] It should be noted that, such as Figure 9 and 10Similarly, after the liner 20 is molded, the holes 27A and 27B of the liner support 24 can freely receive the pin 31 of the brake head 28.

[0140] like Figure 11 As shown, in order to improve the seal established between the sealing body 51 and the suction pipe 52, a sealing member 90 may be arranged at the end of the suction pipe 52 received in the sealing body 51. The sealing member 90 is, for example, an O-ring.

[0141] Figures 9 to 11 The illustrated embodiment offers the advantage that the seal established between chamber 50, orifice 44, and suction conduit 52 is achieved using the friction material of the molded liner 20. Therefore, no additional material is required to establish the seal.

[0142] The method of assembling the liner 18 according to one of the examples above will now be described.

[0143] The method first includes providing a liner 20, a liner support 24, and a sealing chamber 50. Next, the method includes connecting the liner support 24 to the mounting surface 22B of the liner 20 and arranging the sealing chamber 50 in the space 29 such that the suction port 44 leads to the sealing chamber 50.

[0144] As described above, the sealed chamber 50 can be arranged in the space 29 in the following manner: - Weld the sealed chamber 50 to the liner support 24, such as Figure 6 Examples; - The sealed chamber 50 is connected to the liner support 24 via the connecting device 66, such as Figure 7 Examples; - The sealed chamber 50 is retracted and fitted between the liner support 24 and the liner 20, such as Figure 8 As shown in the example; - The liner 20 is molded onto the assembly including the liner support 24 and the suction conduit 52, such as Figures 9 to 11 The example shown.

[0145] exist Figure 6 and 7 In the example embodiment shown, the liner support 24 may first be connected to the mounting surface 22B of the liner 20, and then the sealed chamber 50 may be installed in the space 29. In these examples, the chamber 50 may also first be connected to the liner support 24 (by welding or connecting device 66), and then the liner support 24 may be connected to the mounting surface 22B of the liner 20. In this case, the step of connecting the liner support 24 to the mounting surface 22B is performed simultaneously with the step of arranging the chamber 50 in the space 29 between the liner support 24 and the mounting surface 22B.

[0146] As mentioned above, in Figure 6 and 7 In the example, the filling block 60 is installed in the recess 58 of the housing 56 before the chamber 50 is positioned in the space 29.

[0147] In embodiments where the liner 20 is molded onto an assembly including the liner support 24 and the suction conduit 52, the step of positioning the chamber 50 in space is therefore performed simultaneously with the step of connecting the liner support 24 and the liner 20. As described above, in Figure 9 In this case, chamber 50 is entirely supported by the liner support 24. Figure 10 and 11 In this case, when the liner 20 is molded onto the assembly including the liner support 24 and the suction conduit 52, the chamber 50 is partially formed of the friction material of the liner 20. Furthermore, in Figures 9 to 11 In all the cases shown, once the operation of molding the liner 20 onto the liner support 24 is completed, the chamber 50 is installed in its final position in the space 29.

[0148] It should be noted that several of these techniques for arranging the sealed chamber 50 in the space 29 can be combined in the same liner 18. For example, the same chamber 50 can be both welded to the liner support 24 and secured to the liner support 24 by means of the connecting device 66. This better ensures that the sealed chamber 50 remains in its position in the space 29.

[0149] Figure 12 Show alternative configurations (or with) Figures 4 to 11 (The configuration is combinable), wherein the sealed chamber 50 is arranged at both circumferential ends of the liner 18. As in the example above, the suction pipe 52 is connected to the corresponding slots 30, 32 via the corresponding suction holes 44.

[0150] This arrangement allows for greater flexibility in the arrangement of the pneumatic lines connecting the suction source to the suction line 52. Furthermore, the arrangement of the pneumatic lines is not obstructed by the attachment element (leaf spring) that secures the brake head to the brake shoe. Additionally, in this configuration, the suction is positioned as close as possible to the leading edge of the particle discharge, thereby shortening the length of the trough.

[0151] exist Figure 12 In the middle, the suction pipes 52 have an axial orientation, that is, they are aligned with an axis parallel to the axis of rotation of the disc.

[0152] Figure 13 Showing with Figure 12 The same example, except that the orientation of the suction pipe 52 is basically radial.

[0153] Figure 14A variation is shown (which can also be combined with the elements presented in the above figures). In this example, to accommodate the flexibility required in the central area of ​​the liner, the liner is divided into two parts 18A and 18B. In this case, corresponding pipes 52 can be arranged at the circumferential ends of each part 18A and 18B, engaging with corresponding groove elements 38A and 38B. The numbers 30, 32, 40, and 42 are provided to facilitate understanding of this figure in relation to the above. Figure 5 The relationship.

[0154] To minimize the length and number of hoses connecting pipe 52 to the suction source, it is recommended that suction pipe 52 be arranged as follows: Figure 14 They are arranged close to each other as shown. Alternatively (or otherwise), pipes (and corresponding grooves) may be arranged at the other end of each liner section 18A, 18B.

[0155] This disclosure is not limited to the above-described examples of brake pads and their assembly methods, which are merely illustrative examples, but covers all variations that would be conceived by those skilled in the art within the scope of protection sought.

Claims

1. A brake pad (18), the pad (18) comprising a pad (20) and a pad support (24), the pad (20) being made of a friction material and having at least one particle collection groove (30, 32, 38, 40, 42), the pad support (24) being connected to a surface (22B) of the pad (20), referred to as a mounting surface, wherein a space (29) is provided between the pad support (24) and the mounting surface (22B) of the pad (20), characterized in that, A sealed chamber (50) is arranged in the space (29), the sealed chamber (50) including a suction pipe (52) for fluid communication with a negative pressure source, wherein at least one particle collection tank (30, 32, 38, 40, 42) includes a suction hole (44) leading to the sealed chamber (50) and in fluid communication with the suction pipe.

2. The brake pad (18) according to claim 1, characterized in that, The sealed chamber (50) is welded to the liner support (24) and / or the liner (20).

3. The brake pad (18) according to any one of the preceding claims further includes a connecting device (66) that connects the sealed chamber (50) to the pad support (24) and / or the pad (20).

4. The brake pad (18) according to any one of the preceding claims, characterized in that, The sealed chamber (50) is press-fitted in the space (29) provided between the liner support (24) and the mounting surface (22B) of the liner (24).

5. The brake pad (18) according to any one of the preceding claims, characterized in that, The sealed chamber includes a nut (84) welded to the liner support (24) and / or the liner (20), the nut including an inner annular surface having an internal thread complementary to the external thread on the outer surface of the suction pipe (52).

6. The brake pad (18) according to any one of the preceding claims, characterized in that, The sealed chamber (50) includes a filling block (60) that includes a cavity (62) for fluidly connecting the suction port (44) of the at least one collection groove (30, 32, 38, 40, 42) to a suction pipe (52).

7. The brake pad (18) according to claim 6, characterized in that, The filler block (60) is made of a friction material of silicone and / or a liner (20).

8. The brake pad (18) according to any one of the preceding claims, characterized in that, The sealed chamber (50) and the liner support (24) are made into a single unit.

9. A method for assembling a brake pad (18) according to any one of the preceding claims, the method comprising: - Provides a liner (20), a liner support (24), and a sealed chamber (50); - Connect the liner support (24) to the mounting surface (22B) of the liner (20); - The sealed chamber (50) is arranged in the space (29) between the liner support (24) and the mounting surface (22B) of the liner (20), such that the suction hole (44) of the at least one particle collection groove (30, 32, 38, 40, 42) leads to the sealed chamber (50) and is in fluid communication with the suction pipe (52).

10. The method according to claim 9, characterized in that, The sealed chamber (50) is arranged in the space (29) by at least one of the following techniques: - Weld the sealed chamber (50) to the liner support (24) and / or the liner (20); and / or - Connect the sealed chamber (50) to the liner support (24) and / or the liner (20) via the connecting device (66); and / or - The sealed chamber (50) is retracted and fitted between the liner support (24) and the liner (20); and / or - The liner (20) is molded onto the assembly including the liner support (24) and the suction pipe (52).

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