Magnetic coating for collecting brake abrasion particles for motor vehicle wheel rims

Abstract

The invention relates to a motor vehicle wheel rim, characterized in that the radial inner face (6) of the wheel rim is provided with a coating (7) and that the coating material is magnetic and / or comprises magnets.

Description

[0001] MAGNETIC COATING TO CAPTURE BRAKE WEAR PARTICLES

[0002] FOR VEHICLE RIMS

[0003] The invention relates to a device for collecting brake wear particles from disc brakes, a motor vehicle rim, the use of motor vehicle rims for collecting brake wear particles from disc brakes and an associated motor vehicle.

[0004] Ferrous and therefore magnetic brake wear particles are rubbed off during braking by the brake disc, which is usually made of cast iron, and the brake pads, which contain steel wool as their main component. If these brake wear particles are not captured, they reach the road surface and thus pollute the environment by increasing particulate matter. Furthermore, the brake wear particles, which have particle sizes of approximately 10 nm - 10 pm, contaminate the wheel rims on which the disc brakes are mounted.

[0005] FR 3090057 B1 describes a disc brake in which part of the brake caliper is coated with a magnetic layer. The magnetic layer is intended to capture brake dust particles.

[0006] DE 10 2020 216 507 A1 describes a motor vehicle rim which has an annular magnetic strip designed as a flexible band on the radial inside to collect brake dust particles.

[0007] An object of the present invention is to retain brake wear particles in a particularly simple construction and easy to retrofit for existing wheel rims, whereby the collected brake wear particles can be easily removed during a cleaning process.

[0008] This problem is solved by the independent claims. The dependent claims specify advantageous further developments.

[0009] According to the invention, a motor vehicle rim is used to achieve the object, which has a coating on its radial inner side, wherein the coating material is magnetic and / or it has magnets or magnetic particles.

[0010] Since the majority of brake wear particles are ferromagnetic and the coating is arranged radially outside the brake disc, the majority of the magnetic brake wear particles will move radially outwards from the brake disc onto the magnetic coating, where they will adhere due to the magnetic force. The larger brake wear particles will be thrown radially outwards onto the coating by the centrifugal force of the rotating brake disc. Even very small particles will be influenced by the generated magnetic field and will thus be captured. The brake wear particles rubbed off by the brake shoes will fall onto the magnetic strip in the same way and will be held there. The device according to the invention is also advantageously suitable for retrofitting existing rims, because the coating only needs to be subsequently applied to the inside of the rim.

[0011] In addition, the captured brake wear particles can be easily removed and disposed of during a vehicle wash using a powerful water jet, which is used in car washes for wheel cleaning. Because the brake wear particles are captured in the area of ​​the magnetic strip, the rest of the wheel rim becomes less dirty and requires less frequent cleaning.

[0012] As explained above, the coating material itself can be magnetic. Alternatively, or cumulatively, the coating material can be non-magnetic in origin but contain magnetic particles or magnets.

[0013] The coating can be a paint coat or a pigment-free coating, the latter containing magnets or magnetic pigments. The paint coat has the advantage that its visibility makes cleaning the rim easier. However, the color pigments it contains should weaken the magnetic force that traps brake wear particles. The pigment-free coating therefore provides stronger magnetization; depending on the color of the magnets, the coated area may then be less visible for cleaning purposes.

[0014] Neodymium magnets can be used as magnets, especially those in the compound Nd2FeI4B. Such magnets have high magnetization and are readily available commercially.

[0015] The magnets, e.g., the neodymium magnets mentioned in the last paragraph, are preferably smaller than 1 mm and preferably smaller than 0.5 mm. When integrated into the coating, they have the potential to partially protrude from the coating if a thin layer thickness is chosen, increasing the magnetic force on the brake wear particles to be captured. In one embodiment, the magnets have a coating of coating material and are partially visible from the outside.

[0016] In one embodiment, the magnets are coated with a coating material and are partially visible from the outside. They thus partially protrude from the coating and increase the magnetic force on the brake wear particles to be captured.

[0017] It makes sense to design the coating as an annular strip. Since the invention is intended for a disc brake and the brake wear particles fly radially away from the brake disc, which is arranged with its axis of rotation in the transverse direction of the vehicle, the surface normal to this ring is preferably parallel to the aforementioned axis of rotation. With an annular strip, the entire inner part of the rim does not need to be coated, but only the part of the rim that is important for capturing brake wear particles. This saves coating material, production time, and energy.

[0018] When choosing a coating or coating material, a pigment-free coating is also recommended, since existing pigments disadvantageously weaken the provided magnetic force.

[0019] A further aspect of the invention relates to the use of a magnetic coating radially inward on a motor vehicle rim for capturing ferromagnetic brake wear particles from a motor vehicle's disc brake. The magnetic nature of the coating is preferably achieved by incorporating magnets or magnetic particles, such as the aforementioned neodymium magnets, which are absorbed by the coating material.

[0020] A further aspect of the invention relates to a device for collecting ferromagnetic brake wear particles accumulating in a disc brake of a motor vehicle using a magnetic collecting device. This device has at least one magnetic coating provided on the radial inner side of a motor vehicle rim, wherein the coating material is magnetic and / or comprises magnets. The specific implementation of the coating on the inner side of the rim can be carried out as described above with reference to the motor vehicle rim.

[0021] A further aspect of the invention relates to a motor vehicle, in particular a passenger car or a light commercial vehicle, which comprises at least three motor vehicle rims and which has a motor vehicle rim according to one of the preceding embodiments and / or a device for collecting ferromagnetic brake wear particles accumulating in a disc brake of a motor vehicle according to the preceding paragraph.

[0022] The invention will be explained in more detail below using an exemplary embodiment based on figures not drawn to scale, which are intended merely as an example of the possible implementation of the invention and are not to be construed as limiting. It shows:

[0023] Fig. 1 shows an extract of a rim with a disc brake.

[0024] Fig. 1 partially shows a rim 1 with a disc brake 2, of which the brake caliper 3 and the actual brake disc 4 can be seen, with the brake disc rotating about the axis of rotation D. If this arrangement is installed in the motor vehicle (not shown), the view is in the longitudinal direction of the vehicle.

[0025] When the disc brake 2 is in use, brake wear particles 5 fly tangentially away from the brake disc 4 and reach the radial inner side 6 of the rim 1. Without additional measures, these brake wear particles 5 would escape into the environment through the openings in the hub cap 7. To prevent this, the inner side 6 of the rim 1 has a magnetic coating 8, which here is designed as an annular strip 9. The surface normal to this ring runs through the wheel hub (not shown).

[0026] List of reference symbols

[0027] 1 rim

[0028] 2 disc brakes

[0029] 3 brake caliper

[0030] 4 brake disc

[0031] 5 brake wear particles

[0032] 6 Inside

[0033] 7 Hubcap

[0034] 8 Coating

[0035] 9 Ring-shaped stripe

Claims

Patent claims 1 . Motor vehicle rim, characterized in that it has a coating (7) on its radial inner side (6) and that the coating material is magnetic and / or it has magnets.

2. Motor vehicle rim according to claim 1, characterized in that a paint coating or a pigment-free coating is provided as the coating (7).

3. Motor vehicle rim according to claim 1 or 2, characterized in that neodymium magnets are provided as magnets (), in particular those in the compound Nd2Fei4B.

4. Motor vehicle rim according to one or more of the preceding claims, characterized in that the magnets are smaller than 1 mm, preferably smaller than 0.5 mm.

5. Motor vehicle rim according to one or more of the preceding claims, characterized in that the magnets have a coating of coating material and are partially visible from the outside.

6. Motor vehicle rim according to one or more of the preceding claims, characterized in that the coating (8) is designed as an annular strip (9).

7. Motor vehicle rim according to one or more of the preceding claims, characterized in that a pigment-free coating is provided, 8. Use of a magnetic coating (8) radially inside on a motor vehicle rim (1) for collecting ferromagnetic brake wear particles (5) of a disc brake (2) of a motor vehicle.

9. Device for collecting ferromagnetic brake wear particles (5) arising from a disc brake (2) of a motor vehicle by means of a magnetic collecting device, characterized in that the magnetic collecting device is designed as at least one magnetic coating (8) which is applied to a radial inner side (6) of a motor vehicle rim (1), wherein the coating material is magnetic and / or comprises magnets. A motor vehicle, in particular a passenger car or a light commercial vehicle, comprising at least three motor vehicle rims (1) according to one or more of the preceding claims 1 to 7 or a device according to claim 9.

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