BRAKE DRUM WITH SEAL RING FOR MOTOR VEHICLES

Abstract

Brake drum (2) for a braking device (1) for a motor vehicle, comprising a base (4) and a peripheral wall (5) extending from the base (4). The brake drum (2) comprises a sealing ring (7) having means for attachment (8) to the peripheral wall (5) of the brake drum (2) and at least one sealing element (9) suitable for reducing the diffusion of particles into the air resulting from wear of the brake drum (2) during braking. The sealing ring (7) has a torus shape. Figure for the abbreviation: Fig 1

Description

Title of the invention: BRAKE DRUM WITH SEAL RING FOR MOTOR VEHICLE technical field

[0001] The invention relates to a drum braking device for a motor vehicle. In particular, the invention relates to a brake drum 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] In view of the foregoing, the present invention aims to provide a brake drum that considerably reduces 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 brake drum for a braking system for a motor vehicle, comprising a base and a peripheral wall extending from the base. The brake drum includes a sealing ring having means for attachment to the peripheral wall of the brake drum and at least one sealing element capable of reducing the diffusion of particles into the air resulting from wear of the brake drum during braking.

[0009] Preferably, the sealing ring has a torus shape.

[0010] Advantageously, the sealing ring comprises materials resistant to temperatures up to 500°C.

[0011] Advantageously, the means for fixing the sealing ring to the brake drum include at least one screw and / or at least one clip element.

[0012] According to one embodiment, the sealing ring comprises at least two removable parts separated by at least two fractions of the sealing ring.

[0013] Optionally, the sealing ring is electrostatically charged.

[0014] Advantageously, the sealing ring includes holes suitable for evacuating a liquid located inside the brake drum.

[0015] Preferably, the sealing ring is fixed to the axial ends of the peripheral wall of the brake drum and extends radially into the interior of the brake drum.

[0016] The invention also relates to a motor vehicle comprising a brake drum as defined above. Brief description of the drawings

[0017] 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 accompanying drawings in which:

[0018] - Figure 1 is a side view of a braking device; and

[0019] - Figure [Fig. 2] is a perspective view of the brake drum of a device braking. Detailed description

[0020] Figure 1 shows a braking device 1 for a wheel of a motor vehicle, said braking device 1 comprising a brake drum 2 and a brake plate 3. The brake drum 2 is fixed to the wheel of the motor vehicle and is movable with the wheel while the brake plate 3 is fixed to the chassis of the motor vehicle and is fixed relative to the chassis.

[0021] The brake drum 2 comprises a base 4 and an annular peripheral wall 5 extending from the base 4.

[0022] The brake plate 3 includes annular brake segments, a piston and a hydraulic or mechanical mechanism enabling the brake segments to move apart when the driver brakes.

[0023] When the driver presses the brake pedal of the motor vehicle, the piston attached to the brake plate 3 pushes the brake shoes so that they come into contact with the peripheral wall 5 of the brake drum 2. The friction between the stationary brake shoes and the peripheral wall 5 of the moving brake drum 2 causes the Wheel and vehicle braking. During braking, the friction between the brake shoes and the drum's outer wall 5 causes polluting particles to be released into the atmosphere. An annular space 6 exists between the brake backing plate 3 and the brake drum 2, through which the particles can be released into the air by the centrifugal force created in the rotating brake drum 2, projecting the particles towards the annular space 6.

[0024] To considerably reduce the release of particles into the air, the brake drum 2 includes a sealing ring 7 comprising means for fixing the ring 7 to the peripheral wall 5 of the brake drum 2 and at least one sealing element 9 confining the particles in the brake drum, in order to reduce or even eliminate the diffusion of particles into the air.

[0025] The sealing ring 7 has a torus shape and is fixed to the axial end of the peripheral wall 5 of the brake drum 2. Preferably, the sealing ring 7 extends radially into the interior of the brake drum 2, beyond the peripheral wall in order to fill as much as possible the annular space present between the brake drum 2 and the brake plate 3. The sealing ring 7 protrudes radially into the interior of the brake drum 2 by a few millimeters.

[0026] The sealing ring 7 comprises one or more materials resistant to temperatures up to 500°C in order to withstand the heat produced by the friction of the components during braking.

[0027] The means for attaching the sealing ring 7 to the peripheral wall 5 of the brake drum 2 comprise at least one screw and / or at least one clip element. The sealing element 9 of the sealing ring 7 comprises a solid annular support with or without foam and / or a row of filter bristles. By way of example, the annular support comprises a metallic material such as carbon, steel, or aluminum.

[0028] Figure 2 illustrates in perspective the brake drum 2 including the sealing ring 7. The sealing element 9 of the sealing ring 7 may also include a solid part. The sealing ring 7 includes, for example, an annular support made of composite material fixed to the peripheral wall 5 of the brake drum 2 and a covering of foam and / or filter bristles that covers the annular support.

[0029] The function of the annular support is to create an obstacle for brake particles at the level of the annular space present between the brake plate 3 and the brake drum 2 and the role of the foam and filter hairs is to trap as many brake particles as possible to prevent them from being released into the air.

[0030] During the overhaul of the braking device 1, the foam and / or rows of filter bristles covering the sealing ring 7 are removed, cleaned and / or replaced in order to to restore the sealing ring 7. Similarly, the sealing ring 7 is easily accessible and removable and can be removed, changed, cleaned.

[0031] To further facilitate maintenance of the braking device 1 of the motor vehicle, the sealing ring 7 comprises two removable parts separated by two fractions 10 of the sealing ring 7. Such a removable architecture allows only the sealing ring 7 and the brake drum 2 to be removed during vehicle servicing.

[0032] During vehicle maintenance, the entire braking device 1 can be cleaned and the particles easily vacuumed up.

[0033] According to one embodiment, the sealing ring 7 is electrostatically charged in order to improve the retention of particles during vehicle braking.

[0034] Preferably, the sealing ring 7 has holes suitable for evacuating liquid located inside the brake drum 2 in case of leakage for example.

Claims

Demands

1. Brake drum (2) for braking device (1) for motor vehicle, comprising a base (4) and a peripheral wall (5) extending from the base (4), characterized in that it comprises a sealing ring (7) comprising means for fixing (8) to the peripheral wall (5) of the brake drum (2) and at least one sealing element (9) capable of reducing the diffusion of particles in the air resulting from the wear of the brake drum (2) during braking.

2. Drum (2) according to claim 1, wherein the sealing ring (7) has a torus shape.

3. Drum (2) according to any one of claims 1 and 2, wherein the sealing ring (7) comprises materials resistant to temperatures up to 500°C.

4. Drum (2) according to any one of claims 1 to 3, wherein the sealing element (9) of the sealing ring (7) comprises foam and / or at least one row of filter bristles.

5. Drum (2) according to any one of claims 1 to 4, wherein the means for fixing (8) the sealing ring (7) to the brake drum (2) comprise at least one screw and / or at least one clip element.

6. Drum (2) according to any one of claims 1 to 5, wherein the sealing ring (7) comprises at least two removable parts separated by at least two splits (10) of the sealing ring (7).

7. Drum (2) according to any one of claims 1 to 6, wherein the sealing ring (7) is electrostatically charged.

8. Drum (2) according to any one of claims 1 to 7, wherein the sealing ring (7) includes holes suitable for evacuating a liquid located inside the brake drum (2).

9. Drum (2) according to any one of claims 1 to 8, wherein the sealing ring (7) is fixed to the axial end of the peripheral wall (5) of the brake drum (2) and extends radially into the interior of the brake drum (2).

10. Motor vehicle comprising a brake drum (2) according to any one of claims 1 to 9.

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