BRAKE PAD WITH BRAKE PARTICLE CATCHING ELEMENT

Abstract

Braking device (1) for a motor vehicle comprising a movable brake drum and a brake backing plate (2) fixed to the chassis of the motor vehicle and entering into friction with the brake drum during braking. The brake backing plate (2) has at least one particle collection element (6) for particles resulting from friction between the brake drum and the brake backing plate (2). The collection element (6) is fixed to the brake backing plate (2) or to a component of the brake backing plate (2) by means of magnetic force and / or adhesive bonding and / or screwing and / or clipping. Figure for abbreviation: Fig 1

Description

Title of the invention: BRAKE PLATE WITH BRAKE PARTICLE CATCHING ELEMENT technical field

[0001] The invention relates to a drum braking device for a motor vehicle. In particular, the invention relates to a brake plate of a braking device.

[0002] The invention also relates to a motor vehicle equipped with such a braking device.

[0003] A drum brake system is more economical than a disc brake system but is less efficient, particularly in emergency braking conditions. This is why drum brake systems are often used on the rear wheels of motor vehicles.

[0004] A drum brake system comprises a movable brake drum fixed to the vehicle wheel and a brake backing plate fixed to the vehicle chassis. The brake backing plate includes brake shoes made of materials that withstand high temperatures. The brake shoes generally comprise a heat-resistant composite friction material, such as glass fibers, metal, or ceramic materials.

[0005] When braking by the driver, a piston fixed to the brake plate pushes the brake segments so as to come into friction with the brake drum.

[0006] Friction between the brake plate and the brake drum results in the release of polluting particles into the atmosphere, mainly composed of metallic materials. These particles vary in size, and some particles, known as fine particles, measuring less than 10 µm, are particularly dangerous to the respiratory systems of the population. Description of the invention

[0007] The present invention aims to overcome the aforementioned problems and, in particular, to considerably reduce the diffusion of particles in the air resulting from the friction between the brake drum and the brake plate.

[0008] The invention therefore relates to a braking device for a motor vehicle comprising a movable brake drum and a brake plate fixed to the chassis of the motor vehicle and coming into friction with the brake drum during braking. The brake plate includes at least one element for capturing particles resulting from the friction between the brake drum and the brake plate.

[0009] According to one embodiment, the capture element has a paving stone shape.

[0010] Advantageously, the sensing element is fixed to the brake plate or to a component of the brake plate by means of a magnetic force and / or gluing and / or screwing and / or clipping.

[0011] According to one embodiment, the brake plate comprises several sensing elements.

[0012] Optionally, the sensing element is a magnet.

[0013] Optionally, the sensing element is an electromagnet.

[0014] According to one embodiment, the sensing element is covered with an envelope without electromagnetic impact.

[0015] Advantageously, the cover covering the sensing element is removable.

[0016] According to one embodiment, the capture element is removable.

[0017] The invention also relates to a motor vehicle comprising a braking device as defined above. Brief description of the drawings

[0018] Other objects, features and advantages of the invention will become apparent from the following description, given solely by way of non-limiting example and made with reference to the attached [Fig.1], which is a schematic front view of a braking device. Detailed description

[0019] Figure [1] shows a braking device 1 for a wheel of a motor vehicle, said braking device 1 comprising a brake drum and a brake plate 2. The brake drum is fixed to the wheel of the motor vehicle and is movable with the wheel while the brake plate 2 is fixed to the chassis of the motor vehicle and is fixed relative to the chassis.

[0020] The brake drum comprises a base and 3 annular side walls extending from the base.

[0021] The brake plate 2 includes annular brake segments 4, a piston 5 and a hydraulic or mechanical mechanism enabling the brake segments 4 to move apart when the driver brakes.

[0022] When the driver presses the brake pedal of the motor vehicle, the piston 5 attached to the brake plate 2 pushes the brake shoes 4 so that they come into contact with the side walls 3 of the brake drum. The friction between the stationary brake shoes 4 and the moving side walls 3 of the brake drum causes the wheel and the vehicle to brake.

[0023] To significantly reduce the release of particles into the air due to friction between the brake plate 2 and the brake drum, the brake plate 2 includes one or more particle-capturing elements 6. According to one embodiment Not shown in the figures, the brake plate 2 comprises several particle-sensing elements 6 distributed across the brake plate. The number of particle-sensing elements 6 in the braking device 1 varies according to several conditions, such as the architecture of device 1, the mass of device 1, and the power required for particle capture.

[0024] The sensing element 6 is fixed to the brake plate 2 or to a component of the brake plate 2 and its function is to capture the friction particles present in the braking device 1 during vehicle braking. It is advantageously made from a magnetic material capable of attracting and retaining the brake particles. A permanent magnet is advantageously used.

[0025] The sensing element 6 has a shape that adapts to the architecture of the braking device 1. According to the embodiment illustrated in [Fig.1], the sensing element 6 has a block shape, i.e. a rectangular parallelepiped.

[0026] The sensing element 6 includes means for fixing 7 to the brake plate 2 which comprise a magnetic element and / or a bonding element and / or a bolt and / or a clipping element.

[0027] In one embodiment, the capture element 6 is a magnet resistant to high temperatures, in particular temperatures up to 400°C, and is capable of attracting particles due to its magnetic attraction force.

[0028] Heat affects the properties of magnetic materials. Indeed, when a magnetic material is exposed to high temperatures, its magnetism decreases greatly. Thus, the sensing element 6 is more effective when positioned on a fixed part of the braking device 1, such as the brake plate 2, which heats up less than the brake drum.

[0029] In an embodiment not shown, the capture element 6 is an electromagnet and is thus able to attract particles due to its electromagnetic attractive force.

[0030] To facilitate maintenance of the vehicle comprising a brake plate 2 with a particle-sensing element 6, said particle-sensing element 6 is covered by an electromagnetically impact-free casing 8. For example, the casing 8 covering the particle-sensing element 6 is made of foam that traps the attracted particles. The casing 8 is removable and retains the particles resulting from the vehicle's braking that are attracted to the particle-sensing element 6.

[0031] During the overhaul of the braking device 1, the cover 8 covering the sensing element 6 is removed, cleaned and / or changed in order to restore the sensing element 6. In the same way, the sensing element 6 is easily accessible and removable and can be removed, changed, cleaned.

Claims

Demands

1. Braking device (1) for a motor vehicle comprising a movable brake drum and a brake plate (2) fixed to the chassis of the motor vehicle and coming into friction with the brake drum during braking, characterized in that the brake plate (2) has at least one element for capturing particles resulting from the friction between the brake drum and the brake plate (2).

2. Device (1) according to claim 1, wherein the capture element (6) has a block shape.

3. Device (1) according to any one of claims 1 and 2, wherein the sensing element (6) is fixed to the brake plate (2) or to a component of the brake plate (2) by means of a magnetic force and / or gluing and / or screwing and / or clipping.

4. Device (1) according to any one of claims 1 to 3, wherein the brake plate (2) comprises several sensing elements (6).

5. Device (1) according to any one of claims 1 to 4, wherein the sensing element (6) is a magnet.

6. Device (1) according to any one of claims 1 to 5, wherein the sensing element (6) is an electromagnet.

7. Device (1) according to any one of claims 1 to 6, wherein the sensing element (6) is covered by an envelope (8) without electromagnetic impact.

8. Device (1) according to claim 7, wherein the cover (8) covering the sensing element (6) is removable.

9. Device (1) according to any one of claims 1 to 8, wherein the sensing element (6) is removable.

10. Motor vehicle comprising a braking device (1) according to any one of claims 1 to 9.

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