brake disc

Abstract

A brake disc is proposed which has a coating (8,8') outside its friction surface (3,3'), where the coating material is magnetic and / or has magnets (12).

Description

Technical area

[0001] The invention relates to a brake disc for a motor vehicle brake, in particular for a disc or drum brake. State of the art

[0002] 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 enter the environment and increase particulate pollution. Furthermore, the brake wear particles, which have particle sizes of approximately 10 nm - 10 µm, contaminate the wheel rims on which the disc brakes are mounted.

[0003] WO 81 / 02690 describes a brake with a fibrous friction material, for example, asbestos fibers. The fibers have metal components attached to them, with adjacent magnetic means provided to retain the magnetic particles.

[0004] FR 3090057 B1 describes a disc brake in which part of the brake caliper is coated with a magnetic coating. The magnetic coating is intended to capture brake dust particles.

[0005] 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. Description of the invention

[0006] An object of the present invention is to enable existing vehicles with disc brakes to retain brake particles in the simplest possible manner, whereby the collected brake wear particles can be easily removed during a cleaning process.

[0007] This problem is solved by the independent claims. The dependent claims specify advantageous further developments.

[0008] According to the invention, a brake disc is used to achieve the object, which has a coating outside its friction surface, wherein the coating material is magnetic and / or it has magnets.

[0009] With the brake disc according to the invention, existing brake discs can be used in the manufacturing process, and a coating can simply be applied to them. For the vehicle owner, replacing the brake disc is sufficient if replacement is necessary anyway due to wear and tear to capture brake particles in their existing vehicle. Service work on the existing vehicle, such as that required for retrofitting a brake caliper according to FR 3090057 B1, can be eliminated. This eliminates additional costs and vehicle downtime during the workshop work.

[0010] With the proposed solution, the captured brake wear particles can be easily removed and disposed of during a vehicle wash using a powerful water jet, which is commonly used in car washes to clean wheel rims. Alternatively, the particles can be removed with compressed air.

[0011] Several designs indicate where the coating is best applied. The specific location depends largely on the airflow prevailing in the brake area, which is vehicle-specific: 1. You can first coat the brake disc cup if there is a significant air flow at the level of the wheel axle. 2. If the brake disc is internally ventilated, its internal air channels can be at least partially coated, particularly in the air outlet area. This design allows magnetic particles from the air flow to be trapped by the air channels between the brake rings. 3. The outer surface of the brake disc can be coated, either alternatively or in addition to the latter measure in the case of an internally ventilated brake disc. The coating can be applied, in particular, adjacent to the radial edge or the radially outer edges of the brake rings, and thus in the air outlet area. With this design, magnetic particles from the air flow can be captured by the cavities in the air outlet area. 4. If the brake disc is internally ventilated, the air outlet area can also be crossed by coated webs. These webs connect the two brake rings, between which the air-conducting air ducts are located. When driving, the webs are directly exposed to the airflow exiting the air ducts. This design allows magnetic particles from the airflow to be trapped by the cavities between the brake rings. 5. The radial edge of the brake disc, whether internally ventilated or not, may be provided with a magnetic coating, alternatively or in addition to the options set out in points 3 and 4 above.

[0012] The coating can be a paint coat or a pigment-free coating, the latter containing the magnets or magnetic pigments. The paint coat has the advantage that its visibility makes cleaning the brake disc easier. However, the color pigments contained in the coating should weaken the magnetic force that traps the brake wear particles. The pigment-free coating therefore provides stronger magnetization, and depending on the color of the magnets, the coated area may be less visible for cleaning purposes.

[0013] Neodymium magnets can be used as magnets, especially those in the compound Nd2Fe 14 B. Such magnets have a high magnetization and are readily available commercially.

[0014] 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 selected, e.g., a layer thickness of less than 0.5 mm for magnets < 1 mm or (for magnets y < 0.5 mm) less than 0.25 mm, which increases the magnetic force on the brake wear particles to be captured.

[0015] 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.

[0016] A further aspect of the invention relates to a disc brake for a motor vehicle, in particular a passenger car or a light commercial vehicle, which is equipped with a brake disc according to one or more of the previous embodiments.

[0017] A further aspect of the invention relates to a motor vehicle, in particular a passenger car or a light commercial vehicle, which has at least one disc brake equipped with a brake disc according to one or more of the previous embodiments.

[0018] 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: Fig. 1 a perspective view of an internally ventilated brake disc; Fig. 2 shows a section through the brake disc of the Fig. 1.

[0019] Fig. Figure 1 shows an internally ventilated brake disc 1 for a motor vehicle, in particular a vehicle with an internal combustion engine, such as a hybrid vehicle. The brake disc 1 has two brake rings 2 and 2', each of which has a friction surface 3 and 3' on its end face for frictional contact with a brake pad of a brake caliper (not shown).

[0020] The brake rings 2 and 2' can be made of grey cast iron on the, as Fig. As shown in Figure 2, a coating 7 is applied to the area of ​​the friction surface 3, which serves as a friction partner during braking. The coating can be a 200-250 µm thick hard material layer with embedded carbides.

[0021] In the center of the brake ring 2 is the (carrier) pot 4, with which the brake disc 1 can be attached to a wheel bearing or a wheel (not shown).

[0022] Between the coplanarly arranged brake rings 2, 2', a plurality of ribs 5 are arranged, defining a plurality of air channels 11 through which air flows during operation to cool the brake disc 1. This air exits at the radial end of the brake rings 2 and 2', the air outlet area 6.

[0023] The brake disc 1, for example, has a circumferential coating 8 on the outer surface of the hub 4. A coating can also be selected on the front side of the hub 4. The outer surface is coated over its entire surface, and the coating 8 is only symbolically indicated by elongated dots, which also applies to the other coatings.

[0024] Furthermore, a coating 8' is provided radially outward near the edge 10 of the brake ring 2 and at the corresponding location on the brake ring 2' (not shown). Fig. 1, only a portion radially outside of the brake ring 2 is provided with a coating 8'. Of course, the coating 8' can also be circumferential.

[0025] Unlike a conventional brake disc, the brake disc 1 is equipped with ribs 9 that cross the air outlet area 6. The ribs 9 are attached at one end to the brake ring 2 and at the other end to the brake ring 2'. The shape of the ribs 9 is freely selectable. The ribs 9 are coated at least on their inner side facing the escaping air. Fig. 1, the outside of the bridge 9 is also coated. This is a transparent, pigment-free layer of approximately 0.3 mm thickness with embedded magnets 12 made of Nd2Fe 14B. The magnets 12 thus protrude from the layer and are only coated with a layer of coating material. Since the coating is thin and pigment-free, the magnetic force is only slightly weakened, and the brake particles emerging from the air channels 11 are particularly strongly attracted. List of reference symbols 1 brake disc 2 brake ring 2' brake ring 3 Friction surface 3' friction surface 4 pot 5 ribs 6 Air outlet area 7 Coating 8 magnetic coating 8' magnetic coating 9 jetty 10 Rand 11 Air duct 12 Magnet QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 81 / 02690

[0003] FR 3090057 B1 [0004, 0009] DE 10 2020 216 507 A1

[0005]

Claims

[1] brake disc, characterized by that it has a coating (8,8') outside its friction surface (3,3') and that the coating material is magnetic and / or it has magnets (12). [2] Brake disc according to claim 1, characterized by that the coating (8,8',8") is provided on a pot (4) of the brake disc (1). [3] Brake disc according to one or more of the preceding claims, characterized by that the coating (8,8',8") is provided on the radial edge (10) of the brake disc (1). [4] Brake disc according to one or more of the preceding claims, characterized by that an external coating (8,8',8"), in particular on a brake ring (2,2'), is provided. [5] Brake disc according to one or more of the preceding claims, characterized by that an internally ventilated brake disc (1) is provided and whose internal air channels (11) are at least partially provided with the coating (7). [6] Brake disc according to one or more of the preceding claims, characterized by that an internally ventilated brake disc is provided, the air outlet area (6) of which is crossed by webs (9) provided with a coating (8,8'), and the webs (9) are provided with a coating (8,8'). [7] Brake disc according to one or more of the preceding claims, characterized by that neodymium magnets are provided as magnets (12), in particular those in the compound Nd2Fe 14 B. [8] Disc brake for a motor vehicle, in particular for a passenger car or for a light commercial vehicle, comprising a brake disc (1) according to one of the preceding claims. [9] Motor vehicle, in particular for a passenger car or for a light commercial vehicle, with a disc brake according to claim 8.

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