Internally ventilated brake disc with a filter arrangement, and disc brake with such a brake disc

Abstract

An internally ventilated brake disc (1) for a disc brake comprises two adjacent friction discs (2) which are connected to each other and have through-openings (8) for airflow through the through-openings (8) into at least one cavity (4) between the two friction discs (2). The brake disc (1) has a filter arrangement (12) for absorbing brake dust.

Description

[0001] The invention relates to an internally ventilated brake disc for a disc brake, as well as a disc brake with such a brake disc for a motor vehicle.

[0002] Disc brakes in motor vehicles have brake pads which, depending on the activation of a brake force sensor, are pressed by an actuator against a brake disc connected to a wheel to be braked, in order to transmit a braking effect to the brake disc and thus to the wheel. When the motor vehicle is braked, the braking process creates particulate abrasion in the disc brake in the form of brake dust, which is harmful to the environment.

[0003] Brake discs are subjected to high mechanical and thermal stresses, as disc brakes must convert all the kinetic energy stored in motor vehicles into heat. This heat warms the entire braking system, but primarily the brake discs. For improved heat dissipation, internally ventilated brake discs with two perforated friction discs are used. These discs feature radial cooling vents or webs located between the two friction discs. Compared to a solid brake disc, these friction discs have a significantly larger surface area, which is therefore better suited for heat exchange. This allows heat to be dissipated to the environment more quickly than with solid brake discs. Furthermore, the rotating brake disc generates a centrifugal force that creates a suction effect, resulting in a constant airflow through the perforations in the friction discs and outwards through the radial cooling vents. This further promotes heat dissipation.

[0004] From EP 2 565 486 A1, an internally ventilated brake disc for a motor vehicle disc brake is known, wherein the brake disc has a first friction ring with an outer friction surface and a second friction ring arranged parallel to the first friction ring with an inner friction surface. Several radial cooling channels run between the two friction rings. The front and / or the rear friction ring has several axial through-holes extending from the friction surface to a cooling channel. The first friction ring has an impact edge on its outer diameter aligned with the second friction ring. The effect of this design is that the brake dust generated during braking is "captured" by the through-holes and transported radially outwards through the cooling channels and onto the wheel rim of the motor vehicle via the impact edge. This reduces the soiling of the visible area of ​​the wheel rim.

[0005] EP 4 283 155 A1 discloses an air guide arrangement for a disc brake of a motor vehicle, comprising a brake caliper, a brake disc and a structural element with an air inlet, wherein the structural element has a filter and surrounds the brake disc below the brake caliper. Air is directed into the structural element through the air inlet during driving of the motor vehicle, and brake dust generated during braking of the disc brake is absorbed by the filter.

[0006] It is an object of the invention to provide an internally ventilated brake disc for a disc brake which reduces the environmental impact of brake dust generated during braking, as well as a corresponding disc brake.

[0007] This problem is solved by an internally ventilated brake disc according to claim 1 and a disc brake according to claim 10.

[0008] The dependent claims include advantageous further developments and improvements of the invention in accordance with the following description of these measures.

[0009] The invention relates to an internally ventilated brake disc for a disc brake, comprising two adjacent friction discs which are connected to each other and have openings for airflow through them into at least one cavity between the two friction discs. The brake disc further comprises a filter arrangement for absorbing brake dust.

[0010] In an advantageous embodiment, the filter arrangement is located in an outer area of ​​the two friction discs.

[0011] In another advantageous embodiment, the filter arrangement is arranged in an outer area of ​​the cavity between the two friction discs.

[0012] In another advantageous embodiment, the filter arrangement has one or more filter elements, in particular metallic air filters.

[0013] In a further advantageous embodiment, the filter arrangement has one or more filter elements on an outer circumferential edge of the two friction discs, between the two friction discs.

[0014] In a further advantageous embodiment, the filter arrangement comprises one or more filter elements, in particular metallic air filters, which are arranged on an outer circumferential edge of the two friction discs and which partially or completely cover an outer area of ​​the cavity.

[0015] In another advantageous embodiment, the two friction discs are connected to each other by blades.

[0016] In a further advantageous embodiment, the filter arrangement has several metallic filter grids designed as vanes, which move the air located in the cavity out of the brake disc, the two friction discs being connected to each other by connectors.

[0017] In another advantageous embodiment, the two friction discs each have a friction surface for contact with brake pads of the disc brake, and the through-holes are distributed radially over an entire width of the friction surfaces.

[0018] The invention further relates to a disc brake comprising brake pads and a brake disc according to the invention.

[0019] The primary applications for brake discs are disc brakes for trucks, which experience high braking loads during operation and consequently high wear on the brake pads and brake disc.

[0020] Disc brakes enable cost-effective absorption of brake dust. This significantly reduces the amount of brake dust generated during braking, thus minimizing environmental impact.

[0021] Exemplary embodiments of the invention are shown schematically in the drawings and are explained in more detail below with reference to the figures.

[0022] They show: Fig. 1 A first embodiment of an internally ventilated brake disc with a filter arrangement in a side partial view; Fig. 2 a partial cross-section of the internally ventilated brake disc of the Fig. 1; Fig. 3 a second embodiment of an internally ventilated brake disc with a filter arrangement in a side partial view; Fig. 4 a third embodiment of an internally ventilated brake disc with a filter arrangement in a partial side view; and Fig. 5 a partial cross-section of the internally ventilated brake disc of the Fig. 4.

[0023] The present description illustrates the principles of the inventive disclosure. It is therefore understood that those skilled in the art will be able to design various arrangements which, although not explicitly described here, embody principles of the inventive disclosure and which are also intended to be protected in their scope.

[0024] In the Fig. Figure 1 schematically shows a side view of a portion of an internally ventilated brake disc 1, which has two adjacent friction discs 2. The two friction discs 2 are connected to each other, with a ventilated cavity 4, open in a radial direction, formed between them. Each friction disc 2 has an outwardly facing friction surface 6 and a plurality of through-openings 8 leading from the two friction surfaces 6 to the cavity 4 to allow airflow between the friction surfaces 6 and the cavity 4. The through-openings 8 can be in the form of round bores or any other shape.

[0025] The brake disc 1 is, in particular, a component of a disc brake for a motor vehicle, which includes brake pads 10 to enable the vehicle to be decelerated. Internally ventilated brake discs are used especially for disc brakes that require high braking performance, as these discs allow for better heat dissipation through convection and thermal radiation.

[0026] The brake disc 1 is further equipped with a filter arrangement 12 that absorbs brake dust generated during braking. Each braking action produces particulate abrasion, particularly on the brake pads 10, but also on the friction surfaces 6, which is undesirable because it is harmful to the environment. The brake disc 1 is preferably suitable for use with disc brakes on trucks, which exhibit high levels of particulate abrasion, especially under heavy-duty operating conditions.

[0027] In this embodiment, the filter arrangement 12 is located in an outer area 14 of the friction discs 2, between the two friction discs 2, and comprises at least one filter grid 18. The filter grid 18 lies completely between the two friction discs 2 and runs once around the entire circumference of the brake disc 1. Fig. 1 indicated by dashed lines. The brake disc 1 further includes elements 7 between the two friction discs 2, which are designed as vanes 7 and which stably connect the two friction discs 2 to each other and simultaneously move the air located in the cavity 4 towards the filter grid 18. The vanes 7 are not designed as air filters. The thickness of the filter grid 18 is preferably in the range of 5 mm to 10 mm.

[0028] During vehicle travel, when the brake disc 1 rotates, a vacuum is created in the cavity 4 between the two friction discs 2 due to centrifugal forces and the vanes 7. This generates an airflow through the openings 8 into the cavity 4 of the brake disc 1, drawing in the brake dust generated during braking. This brake dust is then carried by the airflow into the cavity 4 between the two friction discs 2 and subsequently absorbed by the filter grid 18 when the air in the cavity 4 flows out of the cavity 4 of the brake disc 1.

[0029] The filter grid 18 is preferably arranged so densely in the outer area 14, near or on an outer circumferential edge 16 of the two friction discs 2, that the entire airflow flowing through the through-openings 8 into the cavity 4 must pass through the filter grid 18 when the air flows radially outwards from the cavity 4 of the brake disc 1.

[0030] The filter grid 18 is preferably a metallic air filter, for example a fine metal mesh, since the filter grid 18 is exposed to high temperatures during braking. The thickness of the filter grid 18 is preferably in the range of 5 mm to 10 mm. Because the airflow through the brake disc 1 is generated without any active devices and only a few additional components are required for collecting the brake dust, this enables cost-effective brake dust extraction. The brake dust generated during braking is therefore significantly reduced, thus lessening the environmental impact.

[0031] In the Fig. Figure 2 shows a cross-sectional view of a section of the brake disc 1. The brake disc 1 rotates about an axis 26. Between the two friction discs 2, in the outer area 14 of the cavity 4 between the two friction discs 2, the filter grid 18 is arranged, through which brake particles are absorbed. Brake particles that are generated on the friction surfaces 6 during braking and flow into the cavity 4 through the through-openings 8 with an airflow 22 are captured in the filter grid 18 as the air flows through it. The through-openings 8 have a diameter sufficient to generate adequate suction for the brake particles generated on the friction surfaces 6. A bore 24 serves to mount the brake disc 1.

[0032] In the exemplary embodiment of the Fig. 1 and Fig. 2 The filter grid 18 is implemented in the outer area 14 between the two friction discs 2. The through-openings 8 are distributed, in particular, essentially radially over the entire friction surfaces 6 of the two friction discs 2, so that the brake particles that are generated during a braking process and are tangentially dragged along by the two brake pads 10 reach the through-openings 8 and are extracted through the through-openings 8.

[0033] Another embodiment of an internally ventilated brake disc 1 is shown in the Fig. Figure 3 is shown schematically in a side view. The brake disc 1 has two adjacent friction discs 2 which are connected to each other, with a ventilated cavity 4, open in a radial direction, formed between the two friction discs 2. Each friction disc 2 has a friction surface 6 arranged on its outer circumference, as well as a plurality of through-openings 8 leading from the two friction surfaces 6 to the cavity 4 to allow airflow between the friction surfaces 6 and the cavity 4. The through-openings 8 can be in the form of round bores or any other shape. The brake disc 1 has a filter arrangement 12, which in this embodiment comprises several filter grids 18 in an outer area of ​​the two friction discs 2, here between the two friction discs 2.

[0034] The brake disc 1 further includes elements 7 between the two friction discs 2, which are designed as vanes 7 and which stably connect the two friction discs 2 to each other and simultaneously move the air located in the cavity 4 towards the filter grids 18. The thickness of the filter grids 18 is, for example, in the range of 5 mm to 10 mm. The filter grids 18 extend only over partial areas of the circumference of the brake disc 1 in the outer area 14 of the cavity 4 between the two friction discs 2, with one filter grid 18 being arranged between each pair of vanes 7, such that the air which is moved outwards by the vanes 7 towards the filter grids 18 flows out of the brake disc 1 through the filter grids 18, so that the brake dust is absorbed in the filter grids 18.

[0035] In the exemplary embodiments of Fig. 1-3 the filter grid(s) 18 can also be located on the outer circumferential edge 16, but these should preferably not be thicker than 2 mm, or partly on the outer circumferential edge 16 and partly in the cavity 4 between the friction discs 2.

[0036] Another embodiment of an internally ventilated brake disc 1 is shown in the Fig. 4 schematically in a side view and in the Fig. Figure 5 shows a cross-sectional view. The brake disc 1 has two adjacent friction discs 2, which are connected to each other, with a ventilated cavity 4, open in a radial direction, formed between the two friction discs 2. Each friction disc 2 has a friction surface 6 arranged on its outer circumference, as well as a plurality of through-openings 8 leading from the two friction surfaces 6 to the cavity 4 to allow airflow between the friction surfaces 6 and the cavity 4. The through-openings 8 can be in the form of round bores or any other shape.

[0037] The brake disc 1 has a filter arrangement 12, which in this embodiment comprises several filter grids 18 designed as vanes 7, and which move the air located in the cavity 4 out of the brake disc 1. Here, the vanes 7 themselves are designed as air filters. Therefore, stabilizing connectors 20, Fig. 5, between the friction discs 2 required to ensure sufficient stability of the brake disc 1.

[0038] All examples and conditional formulations mentioned herein are to be understood without limitation to the specifically cited embodiments. The disclosure is not limited to the embodiments described here. There is scope for various adaptations and modifications that a person skilled in the art would consider based on their expertise and in accordance with the disclosure. Reference symbol list (part of the description): 1 brake disc 2 friction discs 4 cavities 6 friction surfaces 7 shovels 8 through openings 10 brake pads 12 Filter arrangement 14 Outdoor area 16 Outer perimeter edge 18 filter grids 20 connectors 22 Airflow 24 bore 26 axle QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] EP 2 565 486 A1

[0004] EP 4 283 155 A1

[0005]

Claims

Internally ventilated brake disc (1) for a disc brake, comprising two friction discs (2) arranged adjacent to each other, which are connected to each other and have the through-openings (8) for an air flow (22) through the through-openings (8) into at least one cavity (4) between the two friction discs (2), wherein the brake disc (1) has a filter arrangement (12) for absorption of brake dust. Brake disc (1) according to claim 1, wherein the filter arrangement (12) is arranged in an outer area of ​​the two friction discs (2). brake disc (1) according to claim 1 or 2, wherein the filter arrangement (12) is arranged in an outer area (14) of the cavity (4) between the two friction discs (2). brake disc (1) according to claim 1, 2 or 3, wherein the filter arrangement (12) comprises one or more filter elements (18), in particular metallic air filters. brake disc (1) according to claim 3 or 4, wherein the filter arrangement (12) has one or more filter elements (18) on an outer circumferential edge (16) of the two friction discs (2), between the two friction discs (2). brake disc (1) according to claim 1 or 2, wherein the filter arrangement (12) comprises one or more filter elements (18), in particular metallic air filters, which are arranged on an outer circumferential edge (16) of the two friction discs (2) and which partially or completely cover an outer area (14) of the cavity (4). brake disc (1) according to one of the preceding claims, wherein the two friction discs (2) are connected to each other by vanes (7). brake disc (1) according to claim 1, wherein the filter arrangement (12) has several metallic filter grids (18) designed as vanes (7) which move the air located in the cavity (4) out of the brake disc (1), and wherein the two friction discs (2) are connected to each other by connectors (20). brake disc (1) according to one of the preceding claims, wherein the two friction discs (2) each have a friction surface (6) for contact with brake pads (10) of the disc brake, and wherein the through-openings (8) are distributed radially over an entire width of the friction surfaces (6). Disc brake comprising brake pads (10) and a brake disc (1) according to one of the preceding claims.

Images