DISC BRAKE SYSTEM AND BRAKE DUST PARTICLE FILTER

Description

Technical field

[0001] The invention relates to a disc brake assembly comprising a brake disc and a brake caliper assembly with a brake caliper. The invention further relates to a brake dust particle filter. State of the art

[0002] Brake dust, also known as brake abrasion, contributes to the release of particulate matter into the environment from motor vehicles. This abrasion consists primarily of particles worn away from brake discs and brake pads. In addition to its environmental impact, brake dust causes stubborn soiling that can impair the function of the brakes and adjacent components. Furthermore, brake dust deposits, especially on alloy wheels, are often considered aesthetically displeasing.

[0003] A brake dust collection device for a disc brake is known from DE 10 2010 053 879 A1. The disc brake comprises a brake disc, a brake caliper, and at least one brake pad. The brake pad has an encapsulation that at least partially surrounds it. The encapsulation has a chamber into which brake dust can be directed during braking, allowing it to be deposited. Furthermore, US 2010 / 065387 A1 and DE 10 2009 021203 A1 disclose brake disc arrangements with brake dust filters.

[0004] One object of the invention is to reduce the entry of brake dust into the environment of a disc brake. Disclosure of the invention

[0005] The problem is solved by a disc brake assembly having the features specified in claim 1 and a brake dust particle filter according to claim 13. Preferred embodiments are specified in the respective dependent claims and the description.

[0006] According to the invention, a disc brake assembly is provided. The disc brake assembly comprises a brake disc and a brake caliper assembly with a brake caliper. Directional terms such as radial, axial, or circumferential refer to an axis of rotation of the brake disc. The brake caliper partially surrounds the brake disc. The brake caliper assembly typically also comprises at least two brake pads arranged on opposite sides of the brake disc. The brake pads can be pressed against a friction ring of the brake disc by at least one brake piston of the brake caliper.

[0007] According to the invention, the disc brake assembly further comprises a brake dust particle filter with a filter housing and a filter medium. The filter housing can partially surround the brake disc. In particular, the filter housing can have a U-shaped cross-section. The filter housing and the brake caliper can be separate components. The filter medium serves to retain and collect brake dust particles. The filter medium is arranged section by section within the filter housing.

[0008] The brake dust particle filter can be a brake dust particle filter according to the invention as described below. Features of the brake dust particle filter according to the invention can be provided in the brake dust particle filter of the disc brake assembly according to the invention.

[0009] According to the invention, the filter medium extends beyond the filter housing in the circumferential direction of the brake disc and rests against the brake caliper assembly. In particular, the filter medium can bridge a gap between the filter housing and the brake caliper assembly. The protruding section of the filter medium can direct an airflow laden with brake dust particles from the brake caliper into the filter housing. Within the filter housing, the brake dust particles can be separated particularly effectively by the filter medium. In the area of ​​the filter medium's protrusion, no brake dust particles can escape into the environment between the filter housing and the brake caliper assembly. The filter medium's protrusion, which seals tightly against the brake caliper assembly and extends beyond the filter housing, increases the separation efficiency of the brake dust particle filter because the seal at the interface is improved, and therefore fewer particles escape into the environment.The disc brake arrangement according to the invention releases only an extremely small amount of brake dust particles into its environment.

[0010] The filter medium can overlap the brake caliper assembly in the circumferential direction. In other words, the filter medium and the brake caliper assembly can be arranged one above the other when viewed radially, with at least partial contact in the overlapping areas. This allows for a particularly effective seal between the filter housing and the brake caliper assembly.

[0011] The filter medium can be designed to rest against the brake caliper assembly under elastic preload. This elastic preload prevents the filter medium from lifting off the brake caliper assembly during vibrations, such as those experienced while driving a vehicle equipped with disc brakes. This effectively reduces the entry of brake dust particles into the vicinity of the disc brake assembly.

[0012] Alternatively or additionally, the filter medium can be plastically deformed by its contact with the brake caliper assembly. This plastic deformation allows the filter medium to conform to a contour of the brake caliper assembly, particularly over longer sections. This also reduces the unwanted escape of brake dust particles. Even with plastic deformation of the filter medium, an additional elastic preload is typically applied against the brake caliper assembly to ensure proper contact.

[0013] Preferably, the filter medium extends over a circumferential section of a surface of the brake disc. In other words, the filter medium overlaps a radially outer section of the brake disc in an arc-like shape. The rotation of the brake disc typically creates a radially outward airflow, allowing a particularly large number of brake dust particles to be retained at the outer circumference of the brake disc. Preferably, at least part of the circumferential wall of the filter housing can be lined with the filter medium.

[0014] Alternatively or additionally, the filter medium can extend radially, preferably on both sides, of the brake disc. In other words, the filter medium extends over one or both friction surfaces of the brake disc's friction ring. In a particular embodiment, opposite side walls of the filter housing can be lined with the filter medium.

[0015] In a preferred embodiment, the filter medium may extend beyond an end edge of the circumferential wall facing the brake caliper assembly and / or at least one of the side walls of the filter housing. If the extension occurs at the end edge of the circumferential wall, the overlap with the brake caliper assembly described herein in the radial direction occurs. If the filter medium extends beyond the end edge of at least one of the side walls, the overlap with the brake caliper assembly occurs in the axial direction. It may also be advantageous for the filter medium to extend beyond both the end edge of the circumferential wall and the end edge of at least one of the side walls, as this further improves the sealing of the brake caliper interface.

[0016] In a further embodiment, the filter housing can be designed in the shape of an annular segment and have a receiving area with which it encompasses the brake disc within a predetermined angular range. This predetermined angular range can be at least 20°, in particular at least 30°, for example at least 40° of the brake disc's circumference. The filter housing preferably encompasses the brake disc on both sides, i.e., on both friction surfaces. For this purpose, the filter housing can have a substantially U-shaped form in longitudinal section (relative to an axis of rotation of the brake disc).

[0017] The brake caliper assembly can include a caliper bracket to which the brake caliper is attached. The brake caliper can be axially displaceable on the caliper bracket. In other words, the brake caliper can be designed as a floating caliper. The filter medium can rest against the caliper bracket. In particular, if the caliper bracket has a retaining section located behind the brake caliper in the direction of rotation of the brake disc, against which the filter medium rests, this can improve the dust-tight coupling of the brake dust particle filter to the brake caliper assembly. A brake pad can be supported against the retaining section of the caliper bracket. The caliper bracket and the brake caliper are generally separate components. The caliper bracket and the filter housing can also be separate components.

[0018] Alternatively or additionally to mounting the filter medium on the caliper bracket, it can be designed so that the filter medium rests directly against the caliper. This allows the filter medium to cover any gap between the caliper and the filter housing or caliper bracket. In particular, the filter medium can rest directly against the caliper if the caliper is a fixed caliper and the caliper assembly does not have a separate caliper bracket.

[0019] The brake disc can be an internally ventilated brake disc. This can improve the thermal load capacity of the disc brake assembly.

[0020] The filter housing may have at least one vent opening. Air drawn into the filter housing by the rotation of the brake disc can escape through the vent openings. This prevents air containing brake dust particles from passing the brake dust particle filter.

[0021] Preferably, the at least one vent opening opens the filter housing in a radial direction. In other words, the vent opening allows air to flow out of the filter housing away from the outer surface of the brake disc. In particular, an internally ventilated brake disc causes air to be directed radially outwards.

[0022] It is particularly advantageous for at least one vent opening to be covered by the filter medium. This allows the brake dust particles carried in the air flowing through the filter housing to be retained in the brake dust particle filter.

[0023] Also within the scope of the present invention is a motor vehicle with a disc brake assembly according to the invention. The brake disc can be held on a wheel hub of the motor vehicle. The brake caliper assembly, in particular a brake caliper bracket of the brake caliper assembly, can be held on a wheel carrier of the motor vehicle.

[0024] The present invention also encompasses a brake dust particle filter for a disc brake assembly described above according to the invention. Features of the brake dust particle filter of the disc brake assembly according to the invention may be provided in the brake dust particle filter according to the invention.

[0025] The brake dust particle filter according to the invention comprises a filter housing and a filter medium arranged section by section within the filter housing. According to the invention, the filter medium projects beyond the filter housing in the circumferential direction. This projection of the filter medium enables the filter housing to be tightly connected to a brake caliper assembly, with the projection of the filter medium bearing against the brake caliper assembly.

[0026] The filter medium can consist of a metal fiber fleece, in particular, it can be designed as a metal fiber fleece. A metal fiber fleece exhibits high temperature resistance. It can therefore withstand the temperatures occurring at a disc brake. Furthermore, a metal fiber fleece allows brake dust particles to be effectively cut out of an airflow. A metal fiber fleece can also capture a large quantity of brake dust particles. Alternatively or additionally, the filter medium can also consist of or be made of other temperature-resistant materials, such as a glass fiber fleece and / or ceramic fiber fleece.

[0027] The filter medium can project at least 3 mm, preferably at least 10 mm, and particularly preferably at least 15 mm, beyond the filter housing in the circumferential direction. This enables a reliably brake dust-tight connection of the filter housing to a brake caliper assembly. Brief description of the drawings

[0028] Further features and advantages of the invention will become apparent from the following detailed description of an exemplary embodiment of the invention, from the claims, and from the figures in the drawing, which illustrate details of the invention. The aforementioned and further described features can be implemented individually or in any suitable combination in variants of the invention. The features shown in the drawing are presented in such a way that the special features of the invention are clearly visible. The drawing shows: Fig. 1 shows a disc brake assembly according to the invention with a brake dust particle filter according to the invention, wherein a filter medium protrudes from a filter housing and rests against a brake caliper bracket, in a schematic perspective view; Fig. 2 shows the disc brake assembly of Figure 1 in a schematic sectional view. Embodiments of the invention

[0029] Figure 1 shows a disc brake arrangement 10 in a schematic perspective view. The disc brake assembly 10 has a brake disc. 12 The brake disc 12 is equipped with a friction ring. 14 with two opposing friction surfaces 16, of those in Figure 1 only one is visible, and a recording section 18 designed for attaching the brake disc 12 to a wheel hub (not shown). In Figure 2 The disc brake assembly 10 is shown in a schematic section with the section plane passing through the friction ring 14 of the brake disc 12. The brake disc 12 is rotated about an axis of rotation. 19 rotatable. The brake disc 12 can be designed with ventilation channels (not shown) in the friction ring 14 for internal ventilation.

[0030] The disc brake assembly 10 includes a brake caliper assembly. 20The brake caliper assembly 20 comprises a brake caliper. 22 and a brake caliper bracket 24. The brake caliper 22 is held on the brake caliper bracket 24. In this case, the brake caliper 22 is designed as a floating caliper. The brake caliper 22 is secured by guide pins. 26, compare Figure 2 , guided axially displaceable on the brake caliper bracket 24. The brake caliper bracket 24 serves to attach the brake caliper assembly 20 to a wheel carrier (not shown).

[0031] The disc brake assembly 10 also includes a brake dust particle filter. 28 The brake dust particle filter 28 comprises a filter housing. 30 and a filter medium 32.The filter medium 32 can be a metal fiber fleece. The filter medium 32 is arranged section by section in the filter housing 30. The filter housing 30 can have a U-shaped cross-section. Here, the filter housing 30 extends over a circumferential section. 34 (compare Figure 2 ) of a lateral surface 35 above the brake disc 12 and surrounds (with the legs of its U-shaped cross-section) the friction surfaces 16 of the friction ring 14 (compare Figure 1 ).

[0032] The filter medium 32 extends over the (radially outer) circumferential section 34 of the brake disc 12. In other words, the filter medium 32 partially covers the outer surface 35 of the brake disc 12. Additionally, the filter medium 32 can partially extend over the two friction surfaces 16 of the friction ring 14. For this purpose, the filter medium 32 can be arranged in a U-shape within the filter housing 30.

[0033] The filter medium 32 extends circumferentially beyond the filter housing 30. In other words, the filter medium 32 protrudes circumferentially from the filter housing 30. One length 36 of the supernatant of the filter medium 32, measured in the circumferential direction (compare Figure 2 ) can be at least 12 mm. The protrusion of the filter medium 32 is formed on the outer circumferential part of the filter medium 32; in other words, the protrusion of the filter medium 32 extends circumferentially over the radially outer surface 35 of the brake disc 12. Additionally, it could be provided that the filter medium 32 also projects in the area of ​​the friction surfaces 16 beyond the filter housing 30 towards the brake caliper assembly 20 (not shown in detail).

[0034] The section of the filter medium 32 protruding from the filter housing 30 rests against the brake caliper assembly 20. Here, the filter element 32 rests against the brake caliper bracket 24. The filter medium 32 bridges a gap between the filter housing 30 and the brake caliper bracket 24. To ensure contact with the brake caliper assembly 20, preferably over a flat surface, the filter element 32 can be elastically deformed and, particularly at the edge of the filter housing 30, plastically deformed. The filter medium 32 can extend circumferentially over a portion of the brake caliper assembly 20. In the illustrated embodiment, the filter medium 32 overlaps the brake caliper bracket 24 circumferentially.

[0035] The filter housing 30 can have several vent openings. 38 exhibit, compare Figure 1The vent openings 38 are arranged radially on the outside of the filter housing 30. The vent openings 38 allow an airflow to escape from the filter housing 30, the airflow having a radial velocity component.

[0036] The vent openings 38 are covered by the filter medium 32. The filter medium 32 extends across the inside of the filter housing 32 over the vent openings 38. Brake dust particles are carried along with the airflow, which is conveyed into the filter housing 30 – particularly through the ventilation channels of the internally ventilated brake disc 12. The vent openings 38 allow the airflow to exit the filter housing 30. The filter medium 32 covering the vent openings 38 retains the brake dust particles. In this way, the brake dust particles are collected in the brake dust particle filter 28, more precisely in its filter medium 32. The guidance of the airflow through the vent openings 38 thus increases the separation efficiency of the brake dust particle filter 28. Reference symbol list

[0037] Disc brake arrangement 10 brake disc 12 friction ring 14 friction surfaces 16 Recording section18 axis of rotation 19 brake caliper assembly 20 brake caliper 22 brake caliper bracket 24 sliding bolt 26 Brake dust particle filter 28 Filter housing 30 Filter medium 32 Scope section 34 Surface area 35 length 36 of the protrusion vent openings 38

Claims

1. A disc brake arrangement (10) comprising - a brake disc (12), - a brake calliper assembly (20) with a brake calliper (22), and - a brake dust particle filter (28) with a filter housing (30) and a filter medium (32) arranged in sections in the filter housing (30), characterized in that the filter medium (32) projects beyond the filter housing (30) in circumferential direction of the brake disc (12) and rests in a sealing manner against the brake calliper assembly (20).

2. The disc brake arrangement (10) according to claim 1, characterized in that the filter medium (32) overlaps the brake calliper assembly (20) in the circumferential direction.

3. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the filter medium (32) rests against the brake calliper assembly (20) under elastic prestress.

4. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the filter medium (32) is plastically deformed by the resting with the brake calliper assembly (20).

5. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the filter medium (32) extends over a circumferential section (34) of a circumferential surface (35) of the brake disc (12), preferably with a circumferential wall of the filter housing (30) being at least partially lined with the filter medium (32).

6. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the filter medium (32) extends in a radial direction, preferably on both sides, on the brake disc (12), wherein side walls of the filter housing (30) facing away from each other are preferably at least partially lined with the filter medium (32).

7. The disc brake arrangement (10) according to claim 5 or 6, characterized in that the filter medium (32) projects beyond an end edge of the circumferential wall and / or at least one of the side walls of the filter housing (30) facing the brake calliper assembly (20).

8. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the filter housing (30) is annular segment-shaped and has a receiving region with which it engages around the brake disc in a predetermined angular range, the predetermined angular range preferably being at least 20°, more preferably at least 30°, most preferably at least 40° of the brake disc circumference.

9. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the brake calliper assembly (20) has a brake calliper holder (24), on which the brake calliper (22) is held, preferably displaceably in the axial direction, the filter medium (32) resting in particular against the brake calliper holder (24).

10. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the filter medium (32) rests against the brake calliper (22).

11. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the brake disc (12) is an internally ventilated brake disc (12).

12. The disc brake arrangement (10) according to any one of the preceding claims, characterized in that the filter housing (30) has at least one venting opening (38), preferably wherein the at least one venting opening (38) opens the filter housing (30) in radial direction, wherein the at least one venting opening (38) is covered in particular by the filter medium (32).

13. A brake dust particle filter (28) for a disc brake arrangement (10) according to one of the preceding claims, comprising a filter housing (30) and a filter medium (32) arranged in sections in the filter housing (30), characterized in that the filter medium projects beyond the filter housing (30) in the circumferential direction.

14. The brake dust particle filter (28) according to claim 13, characterized in that the filter medium (32) comprises or consists of a metal fibre fleece, a glass fibre fleece and / or ceramic fibre fleece.

15. The brake dust particle filter (28) according to claim 13 or 14, characterized in that the filter medium (32) projects at least 3 mm, preferably at least 10 mm, particularly preferably at least 15 mm, beyond the filter housing (30) in the circumferential direction.