Friction braking device

Abstract

The invention relates to a friction braking device (10) comprising a caliper (12), at least one pad (16) movable in translation along an axis (A) of movement relative to the caliper (12), the pad (16) being intended to engage with a brake disk, and at least one piston movably mounted on the caliper (12) and capable of axially translating the pad (16), the pad (16) comprising at least one particle suction region that comprises a suction port, characterised in that the device (10) further comprises a suction pipe (60) comprising a first rigid portion (64-1) comprising a first end capable of being opposite the suction port of the pad (16) and a second end, the suction pipe (60) comprising an axially extendable flexible portion (66).

Description

Description Title: FRICTION BRAKING DEVICE Technical field

[0001] This disclosure relates to the field of friction braking devices. Prior art

[0002] The invention relates to a friction braking device intended to equip, for example, a road or rail vehicle, or a stationary rotor machine such as a wind turbine or an industrial machine.

[0003] Such a braking device is known in particular from document FR 3 057 040 B1, in the name of the Applicant. This conventionally comprises a so-called floating caliper, intended to be mounted on a fixed caliper support, and two pads mounted on either side of a brake disc secured to a wheel of a vehicle or a rotor of a stationary machine for example. The device comprises in particular a so-called inner pad, moved in translation by a piston and intended to come to bear on a first surface of the disc, and a so-called outer pad, intended to come to bear on the second surface of the disc, opposite the first surface. The piston comprises a part subjected to pressure from a hydraulic fluid, for example oil, exerted in a pressure chamber.The increase in pressure in the said chamber causes the piston to move axially relative to the caliper and thus pushes the inner pad against the first surface of the disc. Simultaneously, the rear part of the floating caliper pushes the outer pad against the second surface of the disc. The disc is thus braked by a resistive torque resulting from the friction of the pads on the corresponding surfaces.

[0004] When the pressure in the chamber decreases, the piston is retracted and the floating caliper is moved to release the pads. The pads can then be moved away from the disc as it rotates, due to a slight runout naturally present in the disc.

[0005] Each pad comprises a base and a friction lining. The lining is intended to come into contact with the disc, wearing down by abrasion over time. The abrasion of the linings generates particles and dust that can be harmful. In order to limit the emission of such particles, it is known to provide means for collecting and sucking up the emitted particles. For this purpose, each pad comprises a groove formed in the lining and located near a lateral edge of the pad, and a suction orifice opening into said groove and opening axially into the base, opposite the groove. A flexible pipe makes it possible to connect each suction orifice to a suction and filtration device.

[0006] In operation, the flexibility of the lines makes it possible to compensate for any axial displacement of the pads, due to the movement of the piston and / or the progressive wear of the pads. However, such lines have a spring effect tending to apply an unwanted axial force on the pads, this axial force being able to tend to bring them closer or further apart uncontrolled way the disc pads. This can cause premature wear of the pads or lead to incomplete control of the braking torque. Summary

[0007] This disclosure improves the situation.

[0008] To this end, a friction braking device is proposed comprising a caliper, at least one pad movable in translation along an axis of movement relative to the caliper, said pad being intended to cooperate with a brake disc, at least one piston mounted movably on the caliper and capable of axially moving said pad in translation, said pad comprising at least one particle suction zone comprising a suction orifice, characterized in that the device further comprises a suction pipe comprising a first rigid part comprising a first end capable of coming opposite said suction orifice of the pad, and a second end, the suction pipe comprising an axially extensible flexible part comprising a first end connected to the first rigid part and a second end intended to be connected to means for suctioning said particles.

[0009] Also, unlike the prior art, the suction line is not flexible over its entire length, which reduces the spring effect of the suction line on the at least one pad. Indeed, thanks to the axially extensible flexible part, the suction line can compensate for the axial displacement of said pad, but the first rigid part being that opposite the pad, the spring effect exerted on the latter is limited. The residual torques resulting from the contact between the at least one pad and the brake disc are reduced compared to the prior art.

[0010] It is also noted that, thanks to the reduction in the length of the flexible part, the suction line is more heat resistant. Indeed, the first rigid part can have a higher melting point than that of the flexible part.

[0011] By "rigid part" is meant here a part of the suction line which does not change its axial dimension when the piston axially moves the pad. By "flexible part" is meant here a part of the suction line which is capable of changing its axial dimension when the piston axially moves the pad.

[0012] The flexible part being axially extensible, it allows the axial movement of the piston.

[0013] As will be detailed, the first rigid part can be fixed directly or indirectly to the piston. Said rigid part can come from the material of the piston.

[0014] In this text, “axial” is understood as “substantially parallel to said axis of movement”.

[0015] The suction means are for example a suction and filtration device.

[0016] The second end of the flexible part can be connected to said suction means directly, but also indirectly (for example, another part of the pipe can to be inserted between the second end of the flexible part and the suction means, as in the embodiment which will be described below).

[0017] According to one aspect, said suction pipe may comprise a second rigid part comprising a first end connected to the second end of said flexible part, and a second end intended to be connected to said suction means.

[0018] The flexible part is therefore arranged between said first rigid part and said second rigid part. The flexible part can thus contract between the first rigid part and the second rigid part when the piston is retracted.

[0019] In this configuration, the suction means are directly connected to the second rigid part, and indirectly connected (via the second rigid part) to the second end of the flexible part.

[0020] The second rigid part may be fixed to the stirrup, for example by an arm extending substantially in an L shape.

[0021] According to one aspect, said flexible part may comprise at least one bellows.

[0022] Thanks to the bellows, which has folds, the flexible part can follow the axial movement of the corresponding pad (induced by the piston and the disc web) without being subjected to significant tensile forces which risk causing the flexible part to break. Alternatively, the flexible part could be replaced by a telescopic part, flexible or rigid.

[0023] According to one aspect, said flexible part may be made of an elastomeric material, for example rubber. The flexible part may thus exhibit elastic behavior.

[0024] According to one aspect, said suction pipe can be fixed to the wafer, said first end of the first rigid part being able to come into sealing contact with said wafer, opposite said suction orifice of the wafer, so as to connect said suction pipe and said suction zone of the wafer.

[0025] The sealed support of the suction line on the pad opposite the suction port allows the particles generated by the friction of the pad on a brake disc to be sucked up, thus limiting the particles which are ejected outwards.

[0026] The suction line can be attached directly or indirectly, i.e. via an additional part, to the plate.

[0027] According to one aspect, said suction pipe can be fixed to the piston, said first end of the first rigid part being able to come into sealing contact with said pad, opposite said suction orifice of the pad, so as to connect said suction pipe and said suction zone of the pad.

[0028] The suction line is thus fixed to the piston and not to the at least one pad, so that the latter does not exert axial force on the corresponding pad. This avoids the aforementioned drawbacks of the prior art.

[0029] The suction line may be fixed directly or indirectly, i.e. by means of an additional part, to the piston. The first end of the first rigid part of the suction line may bear in a sealed manner directly or indirectly on said plate.

[0030] The corresponding end of the suction line may be capable of bearing tightly against the pad during braking, i.e. when the piston is bearing against the pad so as to push it axially towards the disc. Particles are produced and must therefore be sucked away during such braking phases. It is therefore also during these phases that a seal between the line and the suction zone of the pad must be ensured by means of a tight bearing.

[0031] Outside of braking phases, such sealing is always ensured, which allows particles to be sucked up after braking, at least during a phase, called cleaning, immediately after the braking phases.

[0032] In some cases, the suction line may be integral with a support, said support being fixed to the piston. Said support may be in the form of a sheet metal. Said support may have a central opening through which the piston passes. Said support may be fixed to the piston, for example by screwing, riveting or welding. The suction line may be fixed to this support.

[0033] Said support may comprise an orifice located opposite the corresponding end of the pipe, said support being capable of coming to bear in a sealed manner on the plate so that the suction orifice of the plate and the orifice of the support are opposite each other.

[0034] According to one aspect, the caliper may be a floating caliper capable of being moved axially in translation relative to a caliper support, the device comprising a first pad called the inner pad and a second pad called the outer pad, the first pad being actuated directly by the piston, the second pad being actuated directly by a rear part of the floating caliper, a first suction line being capable of being connected to a suction zone of the first pad, a second suction line being capable of being connected to a suction zone of the second pad.

[0035] In such a floating caliper configuration, a single piston can actuate both the first pad directly and, indirectly via the floating caliper, the second pad.

[0036] The particles emitted by each platelet are sucked up through a dedicated pipe.

[0037] According to one aspect, the rear part of the floating caliper may comprise a suction orifice, the second suction pipe being connected to said suction orifice of the floating caliper, said suction orifice of the floating caliper being capable of coming into sealed contact with the second pad, opposite the suction zone of said second pad, so as to connect said second suction pipe and said suction zone of the second pad.

[0038] As before, the suction port of the caliper may be able to come into sealing contact with the suction port of the second pad, when particles are produced.

[0039] The second pipe may consist entirely of one or more rigid parts and be devoid of any flexible part. For example, the second suction pipe may be made in a floating casting of the stirrup. In particular, the second pipe may be made in one piece with the floating casting of the stirrup.

[0040] The seal between the second suction line and the second pad is therefore ensured by the sealed support between the suction port of the caliper and the suction port of the second pad. This limits the number of parts in the braking system.

[0041] The second suction line may comprise a first end fixed directly or indirectly to the caliper and a second end intended to be connected to a suction and filtration device. It is noted that by fixing the second suction line to the caliper, the second suction line is prevented from exerting forces on the second pad. Indeed, instead of fixing the second suction line directly to the second pad, the suction orifice of the caliper is provided through which the particles resulting from braking are sucked by the second suction line.

[0042] The suction port of the second pad may have a diameter smaller than the diameter of the suction port of the caliper. This ensures that a maximum number of particles emitted during the cooperation between the second pad and the brake disc are sucked in by the second suction line. Indeed, if the suction port of the caliper had the same diameter or a smaller diameter than that of the suction port of the second pad, the risk of accumulation of particles at the interface between the two suction ports would be very high.

[0043] In some cases, a first end portion of the suction port of the caliper comprises a substantially annular shoulder shaped to receive said second suction line.

[0044] The seal between the caliper and the second suction line is thus improved, since the second suction line is partially inserted into the suction port of the caliper. This limits the risk of particles being expelled to the outside of the braking device at the interface between the caliper and the second suction line.

[0045] Said first end portion corresponds in particular to the end portion of the suction port of the caliper which is opposite the second pad. Thanks to the shoulder, the diameter of the suction port of the caliper increases at its first end portion. The second suction line can thus be received in the suction port of the caliper while ensuring that a channel of the suction line in which the particles flow can have a diameter equal to or greater than that of the suction port of the caliper. This limits the risk of accumulation of particles at the interface between the suction port of the caliper and the second suction line.

[0046] The second suction line may in particular be received in a tight or fitted manner in said shoulder.

[0047] Said second suction line can be attached to the caliper by means of at least one removable connecting member. The second suction line can thus be easily replaced in the event of wear. For example, the second suction line can be attached to the caliper by screws.

[0048] The suction orifice of the second pad may be included in a first face of the second pad, the first face of the second pad being metallic and coming into sealed contact with a first metallic face of the caliper onto which the suction orifice of the caliper opens. The seal between the second pad and the caliper is therefore ensured by metal-metal contact.

[0049] According to one aspect, the caliper may be a so-called fixed caliper, the device comprising a first pad called the inner pad on the vehicle side and a second pad called the outer pad on the rim side, each pad being actuated directly by at least one piston, a first suction line being able to be connected to a suction zone of the first pad, a second suction line being able to be connected to a suction zone of the second pad.

[0050] In such a fixed caliper configuration, each pad is actuated by at least one dedicated piston.

[0051] As before, the particles emitted by each platelet are sucked up through a dedicated pipe.

[0052] According to one aspect, at least one of said first suction line and the second suction line may comprise a first rigid portion connected to the pad and an axially extensible flexible portion.

[0053] Also, at least one of the first suction line and the second suction line has the advantages indicated above.

[0054] This document also relates to a braking system comprising a brake disc and a friction braking device of the aforementioned type.

[0055] This document also relates to a vehicle having a braking system of the aforementioned type.

[0056] This document also relates to a stationary rotor machine comprising a braking system of the aforementioned type. Brief description of the drawings

[0057] Other features, details and advantages will become apparent upon reading the detailed description below, and upon analyzing the attached drawings, in which: Fig. 1

[0058] [Fig. 1] shows a schematic perspective view of a friction braking device according to an exemplary embodiment. Fig. 2

[0059] [Fig. 2] shows a schematic side view of the friction braking device of Figure 1. Fig. 3

[0060] [Fig. 3] shows another schematic perspective view of the friction braking device of Figure 1. Fig. 4

[0061] [Fig. 4] shows a schematic view of a front section of the friction braking device of Figure 1. Fig. 5

[0062] [Fig. 5] shows a partial schematic view of another frontal section of the friction braking device of Fig. 1. Fig. 6

[0063] [Fig. 6] shows a schematic perspective view of a portion of the friction braking device of Figure 1 comprising a first pad, a piston, a suction line connected to a support surrounding the piston. Fig. 7

[0064] [Fig. 7] shows a schematic perspective view of the suction line connected to the bracket shown in Figure 6. Fig. 8

[0065] [Fig. 8] shows a partial schematic view of a side section of the friction braking device of Fig. 1 showing a second pad of said device. Fig. 9

[0066] [Fig. 9] shows a schematic perspective view of a friction braking device according to another exemplary embodiment. Description of the embodiments

[0067] Figure 1 shows a schematic perspective view of an example of a friction braking device 10. The device 10 can be used in a braking system, for example in a road or rail vehicle, but also in a stationary rotor machine, such as a wind turbine or an industrial machine.

[0068] The friction braking device 10 comprises a caliper 12. In Figures 1 to 8, the caliper 12 is a floating caliper, but it could also be a fixed caliper as will be detailed. When the caliper 12 is a floating caliper, it can move in translation relative to a caliper support (not shown) on which it is mounted.

[0069] The stirrup 12 comprises a fixed part 13A and a floating casting part 13B, visible in Figure 2.

[0070] The device 10 further comprises a piston 14 mounted on the caliper 12. The piston 14 may comprise a portion subjected to pressure from a hydraulic fluid, for example oil, exerted in a pressure chamber. The increase in pressure in said chamber causes the piston 14 to move relative to the caliper in an axial direction A. In the following, “axial” or “axially” means substantially parallel to the direction A.

[0071] A first pad 16, also called a front pad, is provided in the device 10. In particular, the pad 16 may be arranged in a housing 17 (visible in FIG. 4) provided in a front part 19 of the caliper 12. The pad 16 is for example mounted directly axially opposite the piston 14. In particular, as visible in FIG. 4, the pad 16 may be in contact with the piston 14. As will be detailed later, the pad 16 is intended to cooperate with a brake disc (not illustrated).

[0072] The first plate 16 comprises a sole 18 (also called a “base”) and a lining 20.

[0073] The sole 18 comprises an axially opposite external face 22 and an internal face 24. The external face 22 bears on the piston 14 and / or the caliper 12.

[0074] A thickness of the sole 18 is for example between 3 mm and 5 mm. By “thickness of the sole” is meant here the dimension of the sole 18 in the axial direction A.

[0075] The sole 18 is preferably made of metallic material.

[0076] The lining 20 is fixed on the internal face 24 of the sole 18. The lining 20 is formed by a friction material, commonly called “ferodo”.

[0077] The lining 20 comprises a friction face 26 which is axially opposite the face of the lining 20 which is fixed to the sole 18. The friction face 26 is intended, during the braking phases, to come axially into contact with a first face of the brake disc, which rotates around an axis substantially parallel to the axial direction A. In particular, the friction face 26 comes into contact with the first face of the brake disc when the piston 14 moves in the direction A while approaching the brake disc.

[0078] The lining 20 and the disc release particles resulting from abrasion when the friction face 26 comes into contact with the brake disc during braking. This causes wear of the lining 20 and the disc. The thickness (i.e., the axial dimension) of the lining therefore gradually decreases during the useful life of the pad 16.

[0079] As illustrated in Figure 4, the plate 16 comprises a particle suction zone 28. The particle suction zone 28 comprises a suction orifice 30 formed by a first cavity 32 arranged in the sole 18 and a groove 34 arranged in the lining 20. The suction orifice extends for example substantially axially.

[0080] The first cavity 32 passes through the sole 18 between its external face 22 and its internal face 24 opposite at least a portion of the groove 34 of the lining 20. The groove 34 extends axially between the friction face 26 and the second face of the lining 20. In other words, the depth of the groove 34 is equal to the thickness of the lining 20. Also, the particles released by abrasion can be collected in the groove 34, then sucked through the cavity 32 of the sole 18.

[0081] To suck up the particles collected in the groove 34, the device comprises a first suction line 60. The first suction line 60 has a first end 62 and a second end 63 opposite each other.

[0082] The first end 62, visible in particular in FIG. 5, is capable of coming into sealed contact, directly or indirectly, with the first plate 16. Advantageously, the end 62 is capable of coming into sealed contact opposite the suction orifice 30 of the plate 16. Thus, the suction pipe 60 is connected to the suction zone 28 of the plate 16. This limits the risk of ejection towards the outside of the particles formed by the abrasion of the plate 16 and the disc when they are in contact with each other.

[0083] Advantageously, the end 62 of the suction pipe 60 comes into sealed contact with the pad 16 during the braking phase. Indeed, as explained previously, during the braking phases, the pad 16 comes into axial contact with the braking disc and therefore, the particles are formed by abrasion.

[0084] Outside of braking phases, the seal between the suction line 60 and the pad 16 is also ensured, at least during a cleaning phase immediately following the braking phase. This makes it possible to suck up the particles after braking.

[0085] The second end 63 of the pipe 60 is intended to be connected to suction means (not shown). The suction means are for example a suction and filtration device. Such a device is configured to suck up the particles formed by abrasion of the pad 16 and the brake disc when they come into contact with each other.

[0086] In certain cases, the pipe 60 may comprise at least one rigid part 64 and at least one flexible part 66. By “rigid part” is meant here a part of the pipe 60 which does not modify its axial dimension when the piston 14 axially moves the pad 16. By “flexible part” is meant here a part of the pipe 60 which is capable of modifying its axial dimension when the piston 14 axially moves the pad 16.

[0087] In the non-limiting example of the figures, the pipe 60 comprises a first rigid part 64-1, a second rigid part 64-2 and a flexible part 66 interposed between the two rigid parts 64-1, 64-2.

[0088] The first rigid part 64-1 comprises a first end, which corresponds to the first end 62 of the pipe 60 described above. Also, the first end 62 of the first rigid part 64-1 is capable of coming to bear in a sealed manner, directly or indirectly, on the plate 16, in particular opposite the suction orifice 30 of the plate 16.

[0089] As will be detailed, the first rigid part 64-1 can be fixed on the piston 14 or directly on the plate 16.

[0090] The first rigid part 64-1 further comprises a second end 65 which is axially opposite its first end 62. As is clear from FIG. 5, the second end 65 is connected to the flexible part 66.

[0091] The flexible portion 66 comprises a first end 67 and a second end 69 axially opposite.

[0092] The first end 67 is connected to the first rigid part 64-1. In particular, the first end 67 of the flexible part 66 is connected to the second end 65 of the first rigid part 64-1.

[0093] The second end 69 is intended to be connected to the means for suctioning the particles generated by abrasion. In the example shown, the connection between the second end 69 and the means for suctioning the particles is made indirectly via the second rigid part 64-2. However, according to an example not shown, the second end 69 of the flexible part 66 could be directly connected to the suction means.

[0094] The flexible portion 66 is axially extensible. Advantageously, the flexible portion 66 may be made of an elastomeric material, for example rubber. The flexible portion 66 may thus exhibit elastic behavior, which allows it to follow the axial movement of the piston 14.

[0095] In the figures, the flexible part 66 comprises at least one bellows 70 comprising folds.

[0096] The second rigid part 64-2 has a first end 71. As clearly illustrated in FIG. 5, the first end 71 is connected to the second end 69 of the flexible part 66. The flexible part 66 is therefore arranged between the first rigid part 64-1 and said second rigid part 64-2. The flexible part 66 can thus contract between the first rigid part 64-1 and the second rigid part 64-2 when the piston 14 is retracted.

[0097] The second rigid part 64-2 further comprises a second end which corresponds to the second end 63 of the pipe 60 described above. Also, the second end 63 of the second rigid part 64-2 is intended to be connected to the suction means. For example, the second end 63 can be connected directly to the suction means.

[0098] Thanks to the presence of the rigid parts 64-1, 64-2, the pipe 60 is not flexible over its entire length, which reduces the spring effect of the pipe 60 on the pad 16. In particular, given that the first rigid part 64-1 is the one which is in sealed support, directly or indirectly, on the pad 16, and the one which is fixed, directly or indirectly, on the piston 14, the spring effect exerted on the pad 16 is limited. The residual torques in the braking device are therefore reduced compared to the prior art.

[0099] It is further noted that, thanks to the reduction in the length of the flexible part 66, the pipe 60 can be more heat resistant. Indeed, the rigid parts 64-1, 64-2 can have a melting point higher than that of the flexible part 66.

[0100] In the non-limiting exemplary embodiment illustrated in the figures, the suction pipe 60 is fixed to the piston 14. In particular, the first rigid part 64-1 of the pipe 60 is fixed to the piston 14. More precisely, the first rigid part 64-1 can be fixed to the piston by its first end 62.

[0101] The pipe 60 is thus fixed to the piston 14 and not to the pad 16, so that the pipe 60 does not exert axial force on the pad 16. This prevents the pad 16 from being moved closer to or further away from the brake disc in an uncontrolled manner, which reduces the risk of premature wear of the pad 16 and makes it possible to more completely control the braking torque.

[0102] When the pipe 60 is fixed to the piston, its end 62 is advantageously capable of coming to bear in a sealed manner on the plate 16, opposite the suction orifice 30. The first suction pipe 60 and the suction zone 30 of the plate 16 are thus connected.

[0103] The pipe 60, and in particular its first rigid part 64-1, can be fixed directly to the piston 74. For example, the first rigid part 64-1 can come from the material of the piston 14.

[0104] Alternatively, the first rigid part 64-1 of the pipe 60 can be fixed indirectly to the piston 14. For example, as illustrated in the figures, the first rigid part 64-1 can be connected indirectly to the piston by an additional part 74. The additional part 74 is for example a support which is fixed to the piston 14, for example by screwing, riveting or welding.

[0105] The support 74 may be in the form of a sheet metal. As can be seen from Figure 7, the support 74 has a central opening 75. This opening 75 is crossed by the piston 14, as can be seen in particular in Figure 6.

[0106] The end 62 of the pipe 60 is secured to the support 74. The support 74 may comprise an orifice 76 located opposite the end 62 of the pipe 60. The support 74 is thus able to come into sealed contact with the plate 16 so that the suction orifice 30 of the plate 16 and the orifice 76 of the support are opposite each other.

[0107] In an alternative not illustrated, the pipe 60 could be directly fixed to the plate 16. As previously, the end 62 of the pipe 60 is then able to come into sealed contact with the first plate 12, opposite the suction orifice 30. The first suction pipe 60 and the suction zone 30 of the plate 16 are thus connected.

[0108] As can be seen in the figures, the bracket may further comprise an arm 78 extending in an L shape and which makes it possible to fix the pipe 60 to the bracket 12. Preferably, the arm 78 fixes one of the rigid parts 64, in this case the second rigid part 64-2 to the bracket 12.

[0109] A second pad 36, also called a rear pad, is provided in the device 10. The second pad 36 can be arranged in a housing 37 provided in a rear part 39 of the caliper 12. As is apparent from the figures, in particular from figure 4, the second pad 36 is axially opposite the first pad 16. A space 21 intended to receive the brake disc is formed between the two pads 16, 36.

[0110] The second plate 36 comprises a sole 38 and a lining 40. The sole 38 and the lining 40 are similar or identical to, respectively, the sole 18 and the lining 20 described above. Also, for the sake of brevity, they are not described in detail below. It is noted only that the second plate 36 comprises a suction zone 48 comprising a suction orifice 50 which is formed by a first cavity 52 and a groove 54 similar or identical to, respectively, the first cavity 32 and the groove 34 of the first plate 16. The suction orifice 50 extends for example substantially axially.

[0111] It is also noted that the second pad 36, in particular the friction face of its lining 40, is intended to come axially into contact with a second face of a brake disc axially opposite the first face of the disc during braking phases. As in the case of the front pad 16, this contact causes abrasion of the lining 40 and the disc, thus generating particles.

[0112] As can be seen from Figures 4 and 8, the second plate 36 comprises a first face 42 which bears axially on a first face 56 of the stirrup 12. The first face 42 of the second plate 36 is similar or identical to the external face 22 of the sole 18 of the first plate 16. The first face 42 of the plate 32 and the first face 56 of the stirrup 12 are advantageously metallic.

[0113] Advantageously, when the caliper 12 is a floating caliper, the second pad 36 is mounted on a guide and slides (not shown). Thus, the approach of the second pad 36 to the brake disc is induced by an axial displacement of the caliper 12, in particular of its rear part 39, relative to the caliper support. Such an axial displacement of the rear part 39 of the caliper 12 causes the second pad 36 to slide on the guide and the slides on which it is mounted. The second pad 36 is therefore actuated directly by the rear part 39 of the floating caliper 12. Also, in this floating caliper configuration, a single piston, in this case the piston 14, makes it possible to actuate both the first pad 16 directly and, indirectly via the floating caliper, the second pad 36.

[0114] The suction orifice 50 of the second plate 36 may be included in the first face 42 of the plate 36.

[0115] The rear portion 39 of the stirrup 12 may comprise a suction orifice 80, visible in FIG. 8. The suction orifice 80 passes through the rear portion 39 of the stirrup 12 between the first face 56 and the exterior of the stirrup 12. For example, the suction orifice 80 extends substantially axially.

[0116] Advantageously, when the face 42 of the pad 36 and the face 56 of the caliper 12 are in contact, the suction orifice 50 of the pad 36 and the suction orifice of the caliper 12 are aligned. In particular, the suction orifice 80 of the caliper 12 is able to come into sealed contact with the second pad 36, opposite the suction orifice 50. The first face 42 of the pad 32 and the first face 56 of the caliper 12 being metallic, the seal between the second pad 32 and the caliper 12 is therefore ensured by a metal-metal contact. Thanks to this seal between the pad 32 and the caliper 12, the particles generated by the abrasion of the pad 32 and the disc during the phases of braking can be sucked up by suction means while limiting the particles released into the environment, as will be detailed.

[0117] The suction orifice 80 of the caliper 12 may be capable of coming into sealed contact with the suction orifice 50 of the second pad 36 in the event of braking, when particles are produced by abrasion. Outside of the braking phases, the pad 36 is pushed towards the rear part 39, which also makes it possible to maintain the seal between the second pad 32 and the caliper 12. This makes it possible to suck up the remaining particles during the cleaning phases.

[0118] As shown in Figure 8, the diameter D1 of the suction orifice 50 of the second pad 36 may have a diameter smaller than the diameter D2 of the suction orifice 80 of the caliper 12. This ensures that a maximum of particles emitted during the cooperation between the second pad 36 and the brake disc are sucked in by the suction means. Indeed, if the suction orifice 80 of the caliper 12 had the same diameter or a diameter smaller than that of the suction orifice 50 of the second pad 36, the risk of accumulation of particles at the interface between the two suction orifices 50, 80 would be very high.

[0119] In order to connect the suction ports 50, 80 to the suction means, a second suction pipe 90 is provided in the device 10. The second pipe 90 can be produced in the continuity of the floating casting part 13B.

[0120] The second conduit 90 comprises a first end 92 and a second end 93.

[0121] The first end 92 of the pipe 90 is fixed directly or indirectly to the caliper 12. In the figures, the first end 92 is directly connected to the suction orifice 80 of the floating caliper 12. This makes it possible to indirectly connect the pipe 90 to the suction zone 48 of the second pad 36. The particles generated by abrasion of the pad 36 and the disc can thus move from the suction zone 48 of the pad 36 to the pipe 90 through the orifice 80 of the caliper.

[0122] In particular, the first end 92 is, at least in part, mounted tightly or adjusted in the orifice 80. The sealing between the stirrup 12 and the suction pipe 90 is thus improved, which limits the risk of particles being expelled towards the outside of the device 10 at the interface between the stirrup 12 and the second suction pipe 90.

[0123] In the non-limiting example of the figures, the suction orifice 80 comprises, at an end portion 81 opposite the second plate 36, a shoulder 82. Thanks to the shoulder 82, the diameter D2 of the suction orifice 80 of the stirrup 12 increases at its end portion 81 relative to the rest of the orifice 80.

[0124] The shoulder 82 is for example substantially annular. Advantageously, the shoulder 82 is shaped to receive the second suction pipe 90, in particular the first end 92 thereof. The end 92 of the pipe 90 can in particular be received tightly or adjusted in the end portion 81 of the orifice 80.

[0125] Since the diameter of the suction port 80 of the yoke 12 increases at its first end portion 81 due to the shoulder 82, the suction line 90 can be received in the port suction port 80 of the stirrup while ensuring that a channel 94 of the suction line in which the particles flow has a diameter equal to or greater than that of the suction port 80 of the stirrup. This limits the risk of accumulation of particles at the interface between the suction port 80 of the stirrup 12 and the second suction line 90.

[0126] By fixing the suction line 90 to the bracket 12, the second suction line 90 is prevented from exerting forces on the second plate 36.

[0127] The second end 93 of the pipe 90 is intended to be connected to the suction means. As indicated previously, such means may be a suction and filtration device. It is noted that the first pipe 60 and the second pipe 90 may be connected to the same suction and filtration device, or to separate suction and filtration devices.

[0128] The second suction line 90 is preferably made entirely of one or more rigid portions. In other words, the line 90 is preferably devoid of a flexible portion similar to the flexible portion 66 of the line 60.

[0129] As is clear from Figure 3, the shape of the pipe 90 may include an elbow 95. This elbow 95 makes it possible to place the end 93 of the pipe 90 on the same side of the bracket 12 as the end 63 of the pipe 60. Thus, it is simpler to connect the two pipes 60, 90 to the same suction and filtration device.

[0130] As also visible in Figure 8, the second suction line 90 can furthermore be fixed to the bracket 12 from at least one removable connecting member 96. The line 90 can thus be easily replaced in the event of wear. The removable connecting member 96 is for example a screw.

[0131] Now the alternative embodiment of the device 10 illustrated in Figure 9 will be described. In this figure, the elements of the device 10 identical or similar to those of the example of Figures 1 to 8 are designated by the same reference. Also, for the sake of brevity, they will not be described below, the descriptions given above for such elements being valid for this alternative embodiment.

[0132] In this case, the caliper 12 is a fixed caliper. The fixed caliper is distinguished from the floating caliper described above in that the second pad 36 is axially displaced by a piston 104 similar or identical to the piston 14 which displaces the first pad 16. Also, the second pad 36 is not axially displaced by the movement of the caliper 12 relative to the caliper support.

[0133] Furthermore, in order to follow the movement of the piston 104, the fixed caliper of FIG. 9 may comprise a pipe 110 similar or identical to the pipe 60 described above. That is to say, the pipe 110 may comprise at least one rigid part and at least one flexible part similar or identical to the rigid parts 64-1, 64-2 and the flexible part 66 of the pipe 60.

[0134] Finally, the assembly of the pipe 110 is similar or identical to that of the pipe 60 and, consequently, will not be described in the following. It is only specified that, in a manner analogous to the pipe 60, the pipe 110 can be connected, directly or indirectly, to the piston 104 or on the plate 36. One end 112 of the pipe 110 is capable of coming into sealed contact with the plate 36 opposite the suction orifice 50.

[0135] It is noted that in the case of the fixed caliper as in that of the floating caliper, after friction of the pads 16, 36 on the brake disc, these pads 16, 36 are moved away from the disc due to a slight warp (not shown) present in the disc. In particular, the pads 16, 36 are moved away from the disc during its rotation.

[0136] In the case of the floating caliper illustrated in the figures, the separation of the pads 16, 36 from the brake disc occurs when the piston 14 is retracted (and therefore, moved away from the inner pad 16) and the caliper 12 moves relative to the caliper support so as to move away from the inner pad 36. The pads 16, 36 are thus released, which allows them to move in a direction moving them away from the brake disc by the action of the slight runout of the disc.

[0137] In the case of the fixed caliper, the piston 14, 104 associated with each of the inner 16 and outer 36 pads is retracted so as to move away from the corresponding pad. The pads 16, 36 can thus be moved in a direction moving them away from the brake disc by the action of the slight warping of the disc.

[0138] The present disclosure is not limited to the embodiments described above, only by way of example, but it encompasses all the variants that may be envisaged by those skilled in the art within the framework of the protection sought. For example, as illustrated in the figures, each of the pipes 60, 90, 110 may comprise a tapping 120. Preferably, such tappings 120 are not provided in the device 10 which is intended to be installed in a vehicle or in a stationary rotor machine. These tappings 120 are only useful when the device 10 is used to carry out experimental tests in order to measure the depression in the pipe which carries them.

Claims

Claims

1. Friction braking device (10) comprising a caliper (12), at least one pad (16) movable in translation along an axis (A) of movement relative to the caliper (12), said pad (16) being intended to cooperate with a brake disc, at least one piston (14) mounted movably on the caliper (12) and capable of axially moving said pad (16) in translation, said pad (16) comprising at least one particle suction zone (28) comprising a suction orifice (30), characterized in that the device (10) further comprises a suction pipe (60) comprising a first rigid part (64-1) comprising a first end (62) capable of coming opposite said suction orifice (30) of the pad (16), and a second end (65),the suction pipe (60) comprising a flexible part (66) axially extensible comprising a first end (67) connected to the first rigid part (64-1) and a second end (69) intended to be connected to means for suctioning said particles.,

2. Device (10) according to claim 1, wherein said suction pipe (60) comprises a second rigid part (64-2) comprising a first end (71) connected to the second end (69) of said flexible part (66), and a second end (63) intended to be connected to said suction means. [Claim s] Device (10) according to one of the preceding claims, wherein said flexible part (66) comprises at least one bellows (70).

4. Device (10) according to one of the preceding claims, wherein said flexible part (66) is made of elastomeric material, for example rubber. [Claim s] Device (10) according to one of the preceding claims, in which said suction pipe (60) is fixed to the wafer (16), said first end (62) of the first rigid part (64-1) being able to come into sealing contact with said wafer (16), opposite said suction orifice (30) of the wafer (16), so as to connect said suction pipe (60) and said suction zone (28) of the wafer (16).

6. Device (10) according to one of claims 1 to 4, in which said suction pipe (60) is fixed to the piston (14), said first end (62) of the first rigid part (64-1) being able to come into sealing contact with said plate (16), opposite said suction orifice (30) of the plate (16), so as to connect said suction pipe (60) and said suction zone (28) of the plate (16).

7. Device (10) according to one of the preceding claims, in which the caliper (12) is a floating caliper capable of being moved axially in translation relative to a caliper support, the device (10) comprising a first pad (16) called the inner pad and a second pad (36) called the outer pad, the first pad (16) being actuated directly by the piston (14), the second pad (36) being actuated directly by a rear part (39) of the floating caliper, a first suction line (60) being capable of being connected to a suction zone (28) of the first pad (16), a second suction line (90) being capable of being connected to a suction zone (48) of the second pad (36). [Claim s] Device (10) according to the preceding claim, in which the rear part (39) of the floating caliper comprises a suction orifice (80), the second suction pipe (90) being connected to said suction orifice (80) of the floating caliper, said suction orifice (80) of the floating caliper being capable of coming into sealed contact with the second plate (36), opposite the suction zone (48) of said second plate (36), so as to connect said second suction pipe (90) and said suction zone (48) of the second plate (36).

9. Device (10) according to one of claims 1 to 6, in which the caliper (12) is a so-called fixed caliper, the device (10) comprising a first pad (16) called the inner pad on the vehicle side and a second pad (36) called the outer pad on the rim side, each pad (16, 36) being actuated directly by at least one piston (14, 104), a first suction line (60) being able to be connected to a suction zone (28) of the first pad (16), a second suction line (110) being able to be connected to a suction zone (48) of the second pad (36).

10. Device (10) according to one of claims 7 to 9, wherein at least one of said first suction line (60) and the second suction line (110) comprises a first rigid part (64-1) connected to the plate (16, 36) and a flexible part (66) axially extensible.

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