Vehicle braking system

Abstract

One aspect of the present invention relates to a braking system (1), comprising a caliper (3), the caliper supporting an inner brake lining (4) and an outer brake lining (5), each of the inner and outer brake linings comprising a support plate (41, 51) and a friction layer (42, 52), the inner and outer brake linings (4, 5) comprising an orifice (6) extending through their thickness (E), the braking system (1) further comprising: an inner container (7) facing the orifice (6), the inner container (7) opening onto the support plate (41) and comprising a first magnet (8), an outer container (9) facing the other orifice (6), the outer container (9) opening onto the support plate (51) and comprising a second magnet (10), the faces (11, 12) of the first and second magnets (8, 10) facing the orifice (6) being convex.

Description

Technical Field

[0001] The present invention claims priority from French application No. 2005507, filed on May 25, 2020, the content (text, drawings and claims) of which is incorporated herein by reference.

[0002] One aspect of the invention relates to a vehicle braking system constructed and arranged to collect particles emitted during braking. Another aspect of the invention relates to a vehicle, in particular a motor vehicle, comprising a vehicle braking system constructed and arranged to collect particles emitted during braking. Background Art

[0003] Motor vehicles comprise a braking system comprising linings equipped with friction material which send pressure to brake discs or drums rotationally connected to the wheels of the vehicle in order to exert a braking torque thereon.

[0004] Vehicle braking causes abrasive wear of the friction material and, to a lesser extent, wear of the metal brake discs, which generates particles that are dispersed into the ambient air, polluting it. In the future, anti-pollution standards will impose limits on particle pollutant emissions from braking.

[0005] A known device for recovering particles emitted by a disc brake, notably proposed in document EP 2 309 146 A1, uses holes drilled into the brake lining. These holes penetrate the lining to guide the particles emitted between the friction material and the face of the brake disc towards a rear cavity containing a magnet.

[0006] Particles of friction material containing metallic elements and metal particles of the brake disc are attracted by a magnet arranged parallel to the lining and flat against the bottom of the cavity, and are accumulated in the cavity forming a container to prevent them from being dispersed into the air. During vehicle maintenance, the container is removed to empty the particles.

[0007] However, the magnet arranged flat against the bottom of the container is gradually covered with particles. Since the magnet is relatively far away from the front face of the lining (which is attached to the brake disc), the magnetic field of the magnet near the grinding area is weaker.

[0008] As a result, many particles may be dispersed around the lining and disappear into the air, thereby reducing the particle collection efficiency of such a recovery device. Summary of the Invention

[0009] The present invention aims to overcome the disadvantages of the prior art by providing a vehicle braking system constructed and arranged to collect particles emitted during braking, the particle collection efficiency of the vehicle braking system being high.

[0010] Against this background, the present invention therefore relates in its broadest accepted scope to a vehicle braking system constructed and arranged for collecting particles emitted during braking, the braking system comprising a caliper supporting an inner brake lining and an outer brake lining, each of the inner and outer brake linings comprising a support plate and a friction layer.

[0011] Each of the inner brake lining and the outer brake lining includes an aperture extending through its thickness, the braking system further comprising:

[0012] an inner container facing the orifice of the support plate of the inner brake lining, said inner container opening onto said support plate and comprising a first magnet,

[0013] an outer container facing the orifice of the support plate of the outer brake lining, said outer container opening onto said support plate and comprising a second magnet,

[0014] The faces of the first and second magnets facing the orifice are convex.

[0015] Thus, the convex surfaces of the first and second magnets are able to collect the maximum amount of particles emitted during braking. In fact, the convex portion is able to maximize the particle attraction and collection surface. This thus leads to a reduction (or even elimination) of the ejection of particles emitted into the air during braking.

[0016] In addition to the features mentioned in the immediately preceding paragraph, a vehicle braking system constructed and arranged to collect particles emitted during braking may have one or more additional features of the following features considered individually or in all possible technical combinations.

[0017] According to an aspect of the present invention, at least one of the faces of the first magnet or the second magnet facing one of the apertures is spherical.

[0018] According to an aspect of the present invention, at least one of the surfaces of the first magnet or the second magnet facing one of the apertures is convex.

[0019] According to an aspect of the present invention, at least one of the faces of the first magnet or the second magnet facing one of the apertures comprises a chamfer.

[0020] According to an aspect of the present invention, the inner container is arranged in a piston of the brake system.

[0021] According to an aspect of the present invention, a peripheral storage area is provided between an inner surface of the inner container or the outer container and an outer surface of the first magnet or the second magnet.

[0022] According to an aspect of the present invention, the first magnet and the second magnet have different lengths.

[0023] According to an aspect of the invention, a groove is provided in at least one of the friction layers, the groove opening into the orifice. The orifice is the orifice of the friction layer comprising the groove.

[0024] According to an aspect of the present invention, at least one of the first magnet or the second magnet is made of neodymium iron boron.

[0025] According to another aspect, the invention relates to a vehicle comprising two braking systems constructed and arranged to collect particles emitted during braking according to any one of the above aspects of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention and its various applications will be better understood by reading the following detailed description of the present invention and the accompanying drawings, in which:

[0027] Figure 1 A vehicle braking system according to an aspect of the invention is schematically illustrated.

[0028] Figure 2 yes Figure 1 A cross-sectional view of a brake system according to the invention is shown.

[0029] Figure 3 An embodiment of a brake lining according to an aspect of the invention is schematically shown.

[0030] Figure 4a is a bottom view of a first embodiment of a raised surface of a magnet included in a braking system according to the present invention.

[0031] Figure 4b yes Figure 4a Front view of the raised surface shown.

[0032] Figure 5a is a bottom view of a second embodiment of a raised surface of a magnet included in a braking system according to the present invention.

[0033] Figure 5b yes Figure 5a Front view of the raised surface shown.

[0034] Figure 6 is a top view of a third embodiment of a raised surface of a magnet included in a braking system according to the present invention.

[0035] Figure 7 is a three-dimensional view of a fourth embodiment of a raised surface of a magnet comprised by a braking system according to the invention. DETAILED DESCRIPTION

[0036] Figure 1 A vehicle brake system 1 according to one aspect of the present invention is shown. The brake system 1 is assembled on a brake disc 2. The brake system 1 comprises a caliper 3 supporting an inner brake lining and an outer brake lining, each of which comprises a support plate and a friction layer.

[0037] Figure 2 yes Figure 1 A cross-sectional view of the brake system 1 is shown.

[0038] The brake system 1 comprises a caliper 3. The caliper 3 supports an inner brake lining 4 and an outer brake lining 5, each of which comprises a support plate 41, 51 and a friction layer 42, 52.

[0039] The inner brake lining 4 comprises an orifice 6 which extends through the thickness E of the inner lining 4 , and the outer brake lining 5 comprises an orifice 6 which extends through the thickness E of the outer lining 5 .

[0040] The brake system 1 further comprises an inner container 7, which faces the opening 6 and opens onto the support plate 41 of the inner brake lining 4. In this embodiment, the inner container 7 is arranged in the piston of the brake system 1. The first magnet 8 is arranged in the inner container 7.

[0041] The brake system 1 further comprises an outer container 9, which faces the orifice 6 and opens onto the support plate 51 of the outer brake lining 5. The second magnet 10 is arranged in the outer container 9.

[0042] The face 11 of the first magnet 8 facing the through-going orifice 6 is convex. More specifically, in this example, the convex portion is formed by a raised surface.

[0043] The face 12 of the second magnet 10 facing the through-going orifice 6 is convex. More specifically, in this example, the convex portion is formed by a raised surface.

[0044] In this embodiment, for size reasons, the second magnet 10 has a length L10 that is smaller than the length L8 of the first magnet 8 .

[0045] In a different embodiment not shown, the first magnet 8 and the second magnet 10 may have similar lengths.

[0046] Furthermore, a peripheral storage area Z8 is provided between the inner surface of the inner container 7 and the outer surface of the first magnet 8. To position and maintain the first magnet 8 in the inner container 7, a spacer 13 is provided between the inner surface of the inner container 7 and the outer surface of the first magnet 8.

[0047] Furthermore, a peripheral storage area Z10 is provided between the inner surface of the outer container 9 and the outer surface of the second magnet 10. In order to maintain and position the second magnet 10 in the outer container 9, a shoulder is implemented at the bottom of the outer container 9.

[0048] Thus, the metallically charged particles P generated during braking are attracted by the surfaces 11 and 12 of the first and second magnets 8, 9 that face the orifice 6. Consequently, the particles P penetrate the orifice 6 to adhere to the surfaces 11 and 12 of the first and second magnets 8, 10. When these surfaces 11 and 12 are covered with particles P, the new particles push the previously deposited particles toward the bottom of the inner container 7 or outer container 9.

[0049] Figure 3 An embodiment of a brake lining according to one aspect of the present invention is shown. More specifically, in this embodiment, grooves R are provided in the friction layer 52 of the outer lining 5. In this example, the grooves R extend along the periphery of the friction layer 52 and also open into an aperture 6 extending through the thickness of the outer lining 5. As a result, some of the particles P generated during braking are directed toward the aperture 6 and subsequently adhere to the raised surface 12 of the magnet 10. Other particles are collected by the grooves R. The particles collected by the grooves R are then attracted by the magnet 10. These particles thus move into the grooves R and pass through the aperture 6 to adhere to the raised surface 12 of the magnet 10. The particles thus collected can then be recovered during the vehicle maintenance phase.

[0050] According to one aspect of the invention, the raised surface 12 of the magnet 10 for positioning facing the orifice 6 of the outer lining 5 is convex.

[0051] Figure 4a is a bottom view of a magnet 10 provided with such a raised surface 12, and, Figure 4b 1 is a front view of the magnet 10. The radius of curvature r of the raised surface 12 may be approximately 20 mm. Of course, the convex surface 11 of the magnet 8 may also be raised.

[0052] According to another aspect of the invention, the raised surface 12 of the magnet 10 intended to be positioned facing the orifice 6 of the outer lining 5 is chamfered.

[0053] Figure 5ais a bottom view of a magnet 10 provided with such a beveled surface comprising two bevels, and, Figure 5b 1 is a front view of the magnet 10. The angle α between the two inclined surfaces may be approximately 120°. Of course, the convex surface 11 of the magnet 8 may also be chamfered.

[0054] In another example, the raised surface 12 of the magnet 10 for positioning facing the orifice 6 of the outer brake lining 5 comprises not two but four inclined surfaces. Figure 6 A top view of the magnet 10 is shown, the convex surface 12 of the magnet comprising four inclined surfaces for positioning facing the orifice 6. Of course, the convex surface 11 of the magnet 8 could also comprise four inclined surfaces.

[0055] according to Figure 7 In the different aspects of the invention shown, the surface 12 of the magnet 10 intended to be positioned facing the orifice 6 is spherical. Likewise, the convex surface 11 of the magnet 8 may be spherical.

Claims

1. A vehicle braking system (1) constructed and arranged for collecting particles emitted during braking, the vehicle braking system (1) comprising a caliper (3) supporting an inner brake lining (4) and an outer brake lining (5), each of the inner and outer brake linings comprising a support plate (41, 51) and a friction layer (42, 52), the inner and outer brake linings (4, 5) comprising an orifice (6) extending through their thickness (E), characterised in that The vehicle braking system (1) further comprises: an inner container (7) facing the orifice (6) of the support plate (41) of the inner brake lining (4), the inner container (7) opening onto the support plate (41) and comprising a first magnet (8), an outer container (9) facing the orifice (6) of the support plate (51) of the outer brake lining (5), the outer container (9) opening onto the support plate (51) and comprising a second magnet (10), - the faces (11, 12) of the first and second magnets (8, 10) facing the orifice (6) are convex, wherein at least one of the faces (11, 12) of the first or second magnets (8, 10) facing one of the orifices (6) is spherical, or is convex, or comprises an inclined surface.

2. The vehicle braking system (1) according to claim 1, characterized in that The inner container (7) is arranged in a piston of the vehicle brake system (1).

3. The vehicle braking system (1) according to claim 1 or 2, characterized in that A peripheral storage area (Z8, Z10) is provided between the inner surface of the inner container (7) or the outer container (8) and the outer surface of the first magnet (8) or the second magnet (10).

4. The vehicle braking system (1) according to claim 1 or 2, characterized in that The first magnet (8) and the second magnet (10) have different lengths (L8, L10).

5. The vehicle braking system (1) according to claim 1 or 2, characterized in that A groove (R) is provided in at least one of the friction layers (42, 52), the groove (R) opening into the orifice (6).

6. The vehicle braking system according to claim 1 or 2, characterized in that: At least one of the first magnet or the second magnet (8, 10) is made of neodymium iron boron.

7. A vehicle, characterized in that: The vehicle comprises two braking systems (1) constructed and arranged for collecting particles emitted during braking according to any one of the preceding claims.

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