FR3071573B1 - BRAKE PAD WITH DUST COLLECTOR - Google Patents

Abstract

The invention relates to a disc brake pad (4) for a motor vehicle comprising a support plate (8); a friction layer (10) on the support plate, intended to be in contact with the disc; a skirt (12) at the periphery of the friction layer, forming with said layer (10) a peripheral groove (14) capable of collecting dust produced by the friction layer in contact with the rotating disk, said skirt (12) comprising two opposed radial portions (16) and two opposite circumferential portions (18). One of the two radial portions (16) of the skirt (12) comprises a plurality of transverse air inlet channels (20) in the circumferential groove (14) and the wafer (4) comprises an outlet port (22) air and dust adjacent to the other of the two radial portions (16) of the skirt (12).

Description

The invention relates to the field of motor vehicles, more particularly to the field of motor vehicle brakes.

Motor vehicles equipped with disc brakes generally comprise brake pads which, when braking the vehicle, are pushed on either side of a brake disc by means of pistons. The wafers comprise a support plate and a friction layer intended to come into contact with the still rotating disk. The friction between each plate and the disc wears the friction layer resulting in the formation of dust. Dust created generally include microparticles harmful to the body if inhaled.

Published patent document WO 2013/084188 A1 discloses a brake pad comprising a support plate and a friction layer on said plate. The wafer comprises, at its periphery, a skirt forming a peripheral groove with the friction layer. The peripheral groove is intended to collect the dust emitted during braking. The wafer also comprises in its center an orifice. The central orifice and the groove are connected, by tubes, to a device allowing a supply of fluid under pressure in order to extract the braking dusts.

The published patent document EP 2 309 146 B1 discloses a disk brake pad. The brake pad comprises a support base with a friction layer for engaging the brake disc. The brake pad comprises a reservoir in the support base for receiving wear dust from the friction layer. The brake pad has channels passing through the friction layer and communicating with the reservoir. The brake pad may include a second reservoir adjacent to the first reservoir and located opposite the friction layer. The brake pad also includes, in the or tanks, a device capable of generating a magnetic field configured to attract dust in the tank or tanks.

The published patent document JP 2006-112578 discloses a brake pad provided with a device for collecting dust from the braking of a motor vehicle. The device comprises a dust collection tank configured to be placed under the brake pad, when the latter is in the mounting position. The reservoir is connected to a tube comprising a device configured to generate a negative pressure to direct the dust into the tube to an outlet.

The published patent document DE 198 46 887 A1 discloses a disc brake pad for a motor vehicle comprising a support and a friction layer. The plate comprises grooves and a collection tank of the dust emitted during braking, the grooves communicating with said tank. The tank can be connected to a dust extraction device.

The published patent document KR 100267658 discloses a motor vehicle disc brake pad comprising a carrier plate and a friction layer on said plate. The wafer includes orifices passing through said wafer and configured to be connected to a dust extraction device created during braking

The documents of the state of the art mentioned above describe devices that do not make it possible to recover all the dust arising from the braking and / or requiring dust extraction devices, thus rendering the recovery inefficient and / or complex. brake dust. The invention aims to overcome at least one of the disadvantages of the state of the art mentioned above. More particularly, the invention aims to provide a solution for collecting in a simple and effective way the dust generated during braking.

In the following, the terms "radial" and "axial" refer to the orientation of the brake disc. The invention relates to a disk brake pad for a motor vehicle, comprising a support plate; a friction layer on the support plate, intended to be in contact with the disc; a skirt at the periphery of the friction layer, forming with said layer a peripheral groove capable of collecting dust produced by the friction layer in contact with the rotating disk, said skirt comprising two opposite radial portions and two opposite circumferential portions; remarkable in that one of the two radial portions of the skirt comprises a plurality of transverse air inlet channels in the circumferential groove and the wafer comprises an air outlet port and dust adjacent to the other of the two radial portions of the skirt.

By radial portion is meant a portion that extends at least substantially radially relative to the disk when the brake pad is in position on said disk. The two radial portions may form an angle relative to the radial direction, this angle being limited, for example less than 30 °, preferably less than 20 °.

By circumferential portion is meant a portion which extends at least substantially circumferentially with respect to the disk when the brake pad is in position on said disk. This portion may in some cases be rectilinear.

According to an advantageous embodiment of the invention, the plurality of transverse channels are distributed over the radial portion of the skirt in the radial direction and / or in an axial direction.

According to an advantageous embodiment of the invention, the plurality of transverse channels are distributed radially over at least one half of the radial portion of the skirt.

According to an advantageous embodiment of the invention, the plurality of transverse channels are distributed axially over at least one half of the radial portion of the skirt, said at least one half comprising a free edge of said radial skirt portion intended to contact the disk. .

According to an advantageous embodiment of the invention, each of the transverse channels has a diameter of less than 10 mm and / or greater than 0.5 mm.

According to an advantageous embodiment of the invention, the number of transverse channels of the plurality of transverse channels is greater than 10 and / or less than 50.

According to an advantageous embodiment of the invention, the air outlet orifice and dust passes through the support plate. Advantageously, the orifice has a main direction which is perpendicular to a mean plane of the support plate or which forms with the perpendicular to said plane an angle less than 45 °, preferably less than 30 °.

According to an advantageous embodiment of the invention, the friction layer forms a recess around the air outlet orifice and dust. The invention also relates to a disc brake comprising a brake caliper; a set of brake pads mounted or intended to be mounted on the caliper and intended to cooperate with a disk; remarkable in that each of the brake pads is in accordance with the invention, and in that the radial portion of the skirt comprising the plurality of transverse channels is in the up position when the pads are in position on the caliper in the mounting position . The invention also relates to a motor vehicle comprising at least one disc brake remarkable in that said disc brake is in accordance with the invention.

The measures of the invention are interesting in that the skirt of the wafer comprises on a radial portion of the transverse channels of air inlet, said portion being in the upper position of the brake disc. The transverse channels allow air to enter the circumferential groove of the skirt, thus allowing the dust to be conveyed to an air and dust outlet, located on the plate opposite the channels, in the lower position of the skirt. wafer. The delivery of dust to the outlet is thus passively without external energy source, thus reducing manufacturing costs. In addition, the invention has the advantage of being simple to implement and does not imply substantial modifications of the brake pads. Other features and advantages of the present invention will be better understood with the help of the description and the drawings, among which: FIG. 1 represents a motor vehicle disc brake according to the invention; - Figure 2 shows a view of% of a disc brake pad illustrated in Figure 1; FIG. 3 represents a front view of the brake pad illustrated in FIG. 2.

In the description, the terms "radial" and "axial" refer to the orientation of the brake disc.

FIG. 1 illustrates a motor vehicle disc brake according to the invention and FIGS. 2 and 3 illustrate different views of a disc brake pad of FIG. 1. For a better understanding of the invention, FIGS. 3 will be described together.

The disc brake 2 comprises a brake caliper (not shown) and a set of brake pads 4 mounted or intended to be mounted on the caliper. The brake pads 4 are intended to cooperate with a disc 6. In the following, a single plate 4 will be described but it is understood that the two plates of the disc brake are symmetrical with respect to the disc.

The brake pad 4 comprises a support plate 8 and a friction layer 10 on said support plate. The friction layer 10 is intended to be in contact with the disk 6. The plate 4 comprises a skirt 12 at the periphery of the friction layer 10. The skirt 12 forms with the friction layer 10 a peripheral groove 14 able to collect dust produced by the friction layer in contact with the disk 6 in rotation. The skirt 12 comprises two opposite radial portions 16 and two opposite circumferential portions 18. One of the two radial portions 16 of the skirt 12 comprises a plurality of transverse air inlet channels 20 in the circumferential groove 14 and the plate comprises an air outlet orifice 22 and dust adjacent to the other of the two radial portions 16 of the skirt 12.

The radial portion 16 of the skirt 12 comprising the plurality of transverse channels 20 is in the up position when the plate 4 is in position on the yoke, in the mounting position as shown in FIG.

Thus, during the braking of a motor vehicle, a current of air generated by the movement of the vehicle is introduced into the transverse orifices 20, this being guaranteed by their high position on the wafer when the wafer is in position. mounting on the stirrup. The air inlet via the channels 20 allows the dust to be conveyed along the circumferential groove 14 to the outlet orifice 22 and this passively. The routing of the air in the wafer is represented by arrows in FIG.

According to one embodiment of the invention, the outlet orifice 22 for air and dust passes through the support plate 8. The friction layer 10 forms a recess 24 around the outlet orifice 22 and air dust (Figure 3).

The plurality of transverse channels 20 are distributed over the radial portion 16 of the skirt in the radial direction and / or in an axial direction. Preferably, the plurality of transverse channels 20 are distributed over the radial portion 16 of the skirt 12 in the radial direction and in an axial direction.

The plurality of transverse channels 20 are radially distributed over at least one half of the radial portion 16 of the skirt 12.

The plurality of transverse channels 20 are distributed axially over at least one half of the radial portion 16 of the skirt 12, said at least one half comprising a free edge 26 of said radial skirt portion intended to contact the disc 6. Thus, it is guaranteed an air intake throughout the wear of the brake pad.

Each of the transverse channels 20 has a diameter of less than 10 mm and / or greater than 0.5 mm.

The number of transverse channels of the plurality of transverse channels 20 is greater than 10 and / or less than 50.

The wafer 4 may comprise a dust collecting tank 28 connected to the outlet orifice 22 by means of a tube 30. The reservoir 28 is thus in the low position when the wafer is in position on the stirrup in the mounting position. . The collection reservoir 28 may be arranged laterally to the wafer, opposite the friction layer 10. The dusts resulting from the braking are thus stored in the reservoir 28 and can be recovered during a maintenance phase of the vehicle.

Claims (10)

claims Disc brake pad (4) (2) for a motor vehicle, comprising: - a support plate (8); - a friction layer (10) on the support plate (8) intended to be in contact with the disk (6); a skirt (12) at the periphery of the friction layer (10), forming with said layer a peripheral groove (14) capable of collecting dust produced by the friction layer (10) in contact with the disc (6) in rotation, said skirt (12) comprising two opposite radial portions (16) and two opposite circumferential portions (18); characterized in that one of the two radial portions (16) of the skirt comprises a plurality of transverse air inlet channels (20) in the circumferential groove (14) and the wafer (4) comprises an orifice (22) air outlet and dust adjacent to the other of the two radial portions (16) of the skirt. 2. brake pad (4) according to claim 1, characterized in that the plurality of transverse channels (20) are distributed over the radial portion (16) of the skirt (12) in the radial direction and / or in one direction axial. 3. brake pad (4) according to claim 2, characterized in that the plurality of transverse channels (20) are distributed radially on at least one half of the radial portion (16) of the skirt (12). 4. Brake pad (4) according to one of claims 1 to 3, characterized in that the plurality of transverse channels (20) are distributed axially on at least one half of the radial portion of the skirt, said at least one half comprising a free edge (26) of said radial skirt portion (16) (12) for contacting the disk (6). 5. Brake pad (4) according to one of claims 1 to 4, characterized in that each of the transverse channels (20) has a diameter less than 10 mm and / or greater than 0.5 mm. 6. brake pad (4) according to one of claims 1 to 5, characterized in that the number of transverse channels (20) of the plurality of transverse channels is greater than 10 and / or less than 50. 7. Brake pad (4) according to one of claims 1 to 6, characterized in that the orifice (22) of air outlet and dust passes through the support plate (8). 8. Brake pad according to claim 7, characterized in that the friction layer (10) forms a recess (24) around the orifice (22) of air outlet and dust. Disc brake (2) comprising: - a brake caliper; - a set of brake pads (4) mounted or intended to be mounted on the caliper and intended to cooperate with a disc (6); characterized in that each of the brake pads (4) is according to one of claims 1 to 8, and in that the radial portion (16) of the skirt (12) comprising the plurality of transverse channels (20) is in the high position when the plates (4) are in position on the yoke in the mounting position. 10. Motor vehicle comprising at least one disc brake (2) characterized in that said disc brake (2) is according to claim 9.