brake disc

Abstract

Brake disc (1), comprising: a first friction ring (100) and a second friction ring (200), each of the first friction ring (100) and the second friction ring (200) comprising: a first side surface (110, 210) with a friction surface (111, 211), a second side surface (120, 220) opposite the first side surface (110, 210) and having a ventilation surface (121, 221), a circumferential outer lateral surface (130, 230), a circumferential first edge region (131, 231) between the first side surface (110, 210) and the outer lateral surface (130, 230), and a circumferential second edge region (132, 232) between the second side surface (120, 220) and the outer lateral surface (130, 230). 230), wherein the first friction ring (100) and the second friction ring (200) are arranged coaxially with respect to an axis (A) of the brake disc (1) and parallel to each other, wherein the second side surfaces (120, 220) of the first and second friction ring (100,200) facing each other, the brake disc further comprising: a plurality of ribs (300) arranged between the first friction ring (100) and the second friction ring (200), the ribs (300) connecting the second surfaces (120, 220) of the first friction ring (100) and the second friction ring (200) and forming cooling channels (310), each of the first and second edge regions (130, 230) of the first friction ring (100) and the second friction ring (200) being shaped such that each of the first and second edge regions (130, 230) comprises a circumferential strip (1310, 1320, 2310, 2320) with a width (w) of at least 0.5 mm, in which an orientation of a surface (10) of the brake disc (1) is neither parallel nor orthogonal to the axis (A) of the brake disc (1) is characterized in that the surface (10) of the brake disc (1) has at least one circumferential convex surface (1311, 1321, 2311,2321) within at least one or each of the circumferential strips (1310, 1320, 2310, 2320) of the first and second edge regions (130, 230) of the first and second friction ring (100, 200), wherein at least one or each of the at least one circumferential convex surface (1311, 1321, 2311, 2321) has a minimum radius of curvature (R) in a direction orthogonal to a circumferential direction of the respective first or second edge region (131, 132, 231, 232) of at least 0.25 mm.

Description

The present invention relates to a brake disc and, more specifically, a brake disc for a disc brake assembly of a vehicle. A brake disc is generally used as a friction component of a vehicle's disc brake assembly. A typical disc brake assembly includes a pair of brake pads positioned on either side of the brake disc and means for pressing the brake pads against friction surfaces on both sides of the brake disc. As the vehicle moves, the brake disc rotates with the wheel to which it is mounted. To reduce the vehicle's speed, the driver can apply the disc brake. During application of the disc brake, the brake pads are pressed against the brake disc, creating friction between the stationary brake pads and the rotating brake disc. This friction converts the vehicle's kinetic energy into heat and slows the vehicle down. However, in addition to generating heat, the friction between the brake pads and the brake disc can also cause vibrations and associated noise emissions from the brake disc. Document US2009 / 0050422A1 describes a brake disc known from the prior art, comprising a disc carrier and at least one disc attached to the disc carrier. Document DE 60120338T2 describes a disc brake comprising a pair of friction discs and a plurality of wings extending between the pair of friction discs. Document US 2010 / 0282552 A1 describes a brake disc according to the preamble of claim 1. In particular, it describes a brake disc comprising two parallel and coaxial friction rings having external friction surfaces. The friction rings are connected to one another by a plurality of ribs arranged between the friction rings, forming cooling channels. Furthermore, document US 2010 / 0282552 A1 proposes a specific arrangement of the ribs to reduce brake disc vibrations and associated noise emissions. The present invention is generally aimed at providing a brake disc that is modified in a way that reduces noise emissions caused by vibrations of the brake disc. Furthermore, the invention aims to avoid, as far as possible, modifications that are costly or difficult to manufacture, and modifications that introduce imbalance into the brake disc or that impair its mechanical stability or frictional properties. The invention is defined in claim 1. Examples and preferred embodiments of the invention are disclosed in the dependent claims and in the following description as well as in the drawings. A brake disc according to the invention comprises a first friction ring and a second friction ring. Each of the first and second friction rings comprises a first side surface with a friction surface and a second side surface opposite the first side surface with a ventilation surface, a circumferential outer side surface, a circumferential first edge region between the first side surface and the outer side surface, and a circumferential second edge region between the second side surface and the outer side surface. The first and second friction rings are arranged coaxially and parallel to each other with respect to an axis of the brake disc. The second side surfaces of the first and second friction rings face each other. The brake disc also includes a number of ribs arranged between the first and second friction rings. These ribs connect the second surfaces of the first and second friction rings, forming cooling channels (sometimes also referred to as ventilation channels). Each of the first and second edge regions of the first and second friction rings is shaped, for example, rounded or chamfered, such that each of the first and second edge regions comprises a circumferential strip with a width of at least 0.5 mm in which the surface of the brake disc is neither parallel nor orthogonal to the axis of the brake disc. In other words, every normal vector of the surface of the brake disc within the aforementioned circumferential strip is neither parallel nor orthogonal to the axis of the brake disc. In some embodiments, the aforementioned width may be at least 1 mm, at least 1.5 mm, or at least 2 mm. Typically, however, the width of each of the aforementioned strips is less than 5 mm, less than 4 mm, or less than 3 mm. Due to the aforementioned modifications of the first and second edge regions, the first and second friction rings typically do not contain sharp circumferential edges in these regions. Furthermore, the thickness of the first and second friction rings decreases continuously within the circumferential strips of the first and second edge regions in a direction that points radially outward with respect to the axis of the brake disc. The first and second edge regions of the first and second friction rings are typically rotationally symmetrical with respect to the axis of the brake disc. Typically, the first and second edge regions of both the first and second friction rings have an annular shape, i.e., they have constant outer diameters. Here, the term "width" refers to the smallest width of each circumferential strip along its entire circumferential length. The width of the circumferential strip is therefore measured along a straight line oriented perpendicular to the direction of rotation of the circumferential strip and connecting its two lateral edges. Depending on the surface shape of the brake disc in each circumferential strip, this straight line may pass through the disc material. The thickness of the first and second friction rings is measured in a direction parallel to the axis of the brake disc. The inventors have found that the aforementioned modifications to the first and second edge regions of the first and second friction rings can reduce the noise emissions of the brake disc during braking, at least in one or more frequency ranges. Unlike many known brake disc modifications, which are primarily aimed at altering the normal modes of the brake disc, the modifications to the edge regions of the first and second friction rings according to the present invention do not appear to substantially affect the normal modes of the brake disc in most cases. For example, it has been found that, at least in some embodiments, noise emissions can be reduced that correspond to in-plane vibration modes coupled with out-of-plane modes or that correspond to out-of-plane modes of the brake disc.In some embodiments, noise emissions in a frequency range above 5 kHz can be reduced, for example in a range between approximately 8 kHz and 9 kHz. Furthermore, the proposed modifications can be implemented without substantially altering the design of known brake discs and without requiring expensive or complex manufacturing steps. The proposed solution is not limited to specific brake disc configurations or sizes. Moreover, the proposed modification does not introduce any rotational asymmetries or imbalances, and the mechanical stability of the brake disc is maintained. Finally, it is possible to design the proposed brake disc with modified edges but unchanged friction surfaces (because the edge modifications can be considered even before the disc brake is designed). The frictional properties of the brake disc can therefore be maintained unchanged. It is noted that the term "circumferential," when used to specify a structural element of the brake disc, is intended to describe a structural element that extends continuously around the axis of the brake disc or, equivalently, forms a continuous annular structure around the axis of the brake disc. Furthermore, the circumferential elements described here are typically coaxial with respect to the axis of the brake disc; that is, they share the axis of the brake disc as a common axis. Additionally, the term "direction of circumferential" corresponds to an azimuthal direction with respect to the axis of the brake disc. The term "circumferential length" of a structural element corresponds to a length measured along the direction of circumferential travel of the respective structural element. It is further noted that the term "surface" as used here refers to a macroscopic or smoothed surface of the brake disc that does not resolve microscopic (or even atomic) surface structures or textures of the brake disc. For example, the surface under consideration is smoothed so that structures with heights and / or widths of less than 10 µm, or alternatively with heights and / or widths of less than 100 µm, are not resolved. Therefore, the surface of the brake disc, as considered here, can be defined as an average surface of the brake disc or as an envelope of the brake disc. The average surface or envelope can, for example, be defined as an approximation of the actual physical surface of the brake disc with a minimum local curvature of at least 10 µm, or alternatively, at least 100 µm. In some embodiments, the surface of the brake disc can include at least one chamfer within at least one of the circumferential strips of the first and second edge regions of the first and second friction rings. The chamfer(s) typically have the form of circumferential conical surfaces. The surface of the brake disc can therefore include at least one circumferential conical surface within at least one of the circumferential strips of the first and second edge regions of the first and second friction rings. For example, the surface of the brake disc can include a first circumferential conical surface within the circumferential strip of the second edge region of the first friction ring and also a second circumferential conical surface within the circumferential strip of the second edge region of the second friction ring. In some examples, at least one or each of the at least one circumferential conical surface has an angle of inclination relative to the axis of the brake disc within a range of 15° to 75°, preferably within a range of 25° to 65°, more preferably within a range of 35° to 55° and most preferably within a range of 45° ± 3°, ± 2° or ± 1° or identical to 45° (i.e. identical within the manufacturing tolerance). In some embodiments, at least one or each of the at least one circumferential conical surface has a width of at least 0.5 mm or at least 1 mm, preferably a width in the range of 0.5 mm to 4 mm, more preferably in the range of 1 mm to 3 mm, most preferably in the range of 2 mm ± 0.5 mm, ± 0.2 mm or ± 0.1 mm or identical to 2 mm (i.e., identical within the manufacturing tolerance). It is noted that the angle of inclination of each circumferential conical surface can also be defined as half the opening angle of the cone corresponding to the circumferential conical surface. The term "width" is used for circumferential conical surfaces in the same way as described above for circumferential strips. The width of the circumferential conical surfaces therefore refers to the smallest width of the respective circumferential conical surface along its entire circumferential length. The width is measured along a straight line oriented perpendicular to the direction of circumferential rotation, connecting the two circumferential lateral boundaries of the circumferential conical surface. Typically, the circumferential conical surface has the same width as the circumferential strip in which it is contained. According to the invention, the surface of the brake disc comprises at least one circumferential convex surface within at least one or each of the circumferential strips of the first and second edge regions of the first and second friction rings. At least one or each of the at least one circumferential convex surface has a minimum radius of curvature of at least 0.25 mm in a direction orthogonal to a circumferential direction of the respective first or second edge region. Alternatively, the minimum radius of curvature can be defined as the radius of the smallest circle of curvature of the respective circumferential convex surface, oriented parallel to the axis of the brake disc.Due to its convexity, a circumferential convex surface can be characterized by the property that for every pair of points on the circumferential convex surface, a straight connecting line linking the pair of points lies entirely beneath the circumferential convex surface (i.e., entirely within the material of the respective first or second friction ring). The width of the circumferential convex surfaces can be defined in the same way as the width of the circumferential strips. Typically, each of the at least one circumferential convex surface has the same width as the corresponding circumferential strip in which it is contained. In some embodiments, the surface of the brake disc may include a first circumferential convex surface within the circumferential strip of the first edge region of the first friction ring, and may also include a second circumferential convex surface within the circumferential strip of the first edge region of the second friction ring. At least one or both of the first and second circumferential convex surfaces may have a minimum radius of curvature of at least 0.25 mm in a direction orthogonal to the direction of rotation of the respective first edge region. In some embodiments, the minimum radius of curvature of the at least one or each of the at least one circumferential convex surface may be at least 0.5 mm, or in the range of 1 mm ± 0.5 mm, 1 mm ± 0.2 mm, 1 mm ± 0.1 mm, or identical to 1 mm (i.e., identical within the manufacturing tolerance). In some embodiments, the brake disc includes a first circumferential convex surface within the circumferential strip of the first edge region of the first friction ring. The first circumferential convex surface may have a minimum radius of curvature in a direction perpendicular to a direction of rotation of the first edge region of the first friction ring in a range as specified above, for example, 0.25 mm or more. The brake disc may also include a second circumferential convex surface within the circumferential strip of the first edge region of the second friction ring. The second circumferential convex surface may also have a minimum radius of curvature in a direction perpendicular to a direction of rotation of the first edge region of the second friction ring in a range as specified above, for example, 0.25 mm or more.Furthermore, the brake disc may have a first circumferential conical surface within the circumferential strip of the second edge region of the first friction ring, wherein the first circumferential conical surface has an angle of inclination relative to the axis of the brake disc within one of the ranges specified above, for example, in the range of 15° to 75°, and a width within one of the ranges specified above, for example, 0.5 mm or more. The brake disc may also have a second circumferential conical surface within the circumferential strip of the second edge region of the second friction ring, wherein the second circumferential conical surface has an angle of inclination relative to the axis of the brake disc within one of the ranges specified above, for example, within the range of 15° to 75°, and a width within one of the ranges specified above, for example, 0.5 mm or more. In some embodiments, the smallest radius of curvature of each of the first and second circumferential convex surfaces is, for example, within a range of 0.8 mm to 1.2 mm. The angle of inclination of each of the first and second circumferential conical surfaces may, for example, be within a range of 43° to 47°. The width of each of the first and second circumferential conical surfaces may, for example, be within a range of 1.7 mm to 2.3 mm. Further examples of preferred ranges for the smallest radii of curvature of the circumferential convex surfaces and for the angles of inclination and widths of each of the first and second circumferential conical surfaces are given above. In some embodiments, at least one or both of the circumferential outer lateral surfaces of the first and second friction rings contain a circumferential cylindrical surface. For example, the circumferential cylindrical surface may adjoin the circumferential strips of the first and second edge regions of the respective first or second friction ring. In some embodiments, at least one or each of the first side faces of the first and second friction rings can comprise a first circumferential flat surface. The first circumferential flat surface can adjoin the circumferential strip of the first edge region of the respective first or second friction ring. In some embodiments, at least one or both of the second side faces of the first and second friction rings can comprise a second circumferential flat surface. The second circumferential flat surface can adjoin the circumferential strip of the second edge region of the respective first or second friction ring. The invention is described in more detail below with reference to an embodiment shown schematically in the drawings. The drawings show: Fig. 1 a top view of an embodiment of a brake disc according to the invention, Fig. 2 a side view of the embodiment shown in Fig. 1, Fig. 3 an enlarged view of an area circled in Fig. 2, Fig. 4 a side view of a part of a first friction ring of the embodiment shown in Figs. 1, 2 to 3. Figures 1, 2, 3 to 4 show different views of an embodiment of a brake disc 1 according to the invention. The brake disc comprises a first friction ring 100 and a second friction ring 200. As can be seen particularly clearly in the view shown in Fig. 2, each of the first friction ring 100 and the second friction ring 200 comprises a first side surface 110, 210 with a friction surface 111, 211, and a second side surface 120, 220, which is opposite the respective first side surface 110, 210, with a ventilation surface 121, 221. Each of the first and second friction ring 100, 200 also comprises a circumferential outer lateral surface 130, 230, a circumferential first edge region 131, 231 between the first side surface 110, 210 and the outer lateral surface 130, 230, and a circumferential second edge region 132, 232 between the second side surface 120, 220 and the outer lateral surface 130, 230. The first friction ring and the second friction ring 100, 200 are arranged coaxially with respect to an axis A of the brake disc 1 and parallel to each other. The second side surfaces 120, 220 of the first and the second friction ring 100, 200 face each other. The brake disc 1 also includes a plurality of ribs 300, which are arranged between the first friction ring 100 and the second friction ring 200. The ribs 300 connect the second side surfaces 120, 220 of the first friction ring 100 and the second friction ring 200 and form cooling channels 300. As can be seen particularly clearly in Figures 3 and 4, each of the first and second edge regions 131, 132, 231, 232 of the first friction ring 100 and the second friction ring 200 is shaped, for example, rounded or chamfered, such that each of the first and second edge regions 131, 231, 231, 232 comprises a circumferential strip 1310, 1320, 2310, 2320 with a width of at least 0.5 mm, in which an orientation of a surface 10 of the brake disc 1 is neither parallel nor orthogonal to the axis A of the brake disc. In the illustrated embodiment, the aforementioned width is, for example, between 1.8 mm and 2.2 mm, preferably approximately 2 mm. As can also be clearly seen, the thickness of the first friction ring 100 and the thickness of the second friction ring 200 decrease continuously within their respective first and second edge regions 131, 132, 231, 232, measured in a direction parallel to the axis of the brake disc 1, in a direction that points radially outward with respect to the axis of the brake disc 1. The first and second edge regions 131, 132, 231, 232 of the first and second friction rings 100, 200 are rotationally symmetrical with respect to the axis A of the brake disc 1. In particular, the first and second edge regions 131, 132, 231, 232 of the first and second friction rings 100, 200 have the shape of circular rings, i.e., with constant outer diameters. As shown in Fig. 4, the width of each of the circumferential strips 1310, 1320, 2310, 2320 is measured along a straight line (shown in Fig. 4 as a dashed line through the circumferential strip 1310) which is oriented perpendicular to the direction of rotation of the respective circumferential strip 1310, 1320, 2310, 2320 and which connects the two circumferential lateral boundaries of the circumferential strip 1310, 1320, 2310, 2320. As can be seen particularly clearly in Fig. 3 and Fig. 4, the surface 10 of the brake disc contains two chamfers which are formed as circumferential conical surfaces 1321, 2321 within the circumferential strips 1320, 2320 of the second edge areas 132, 232 of the first and second friction ring 100, 200. In the present embodiment, the surface 10 of the brake disc 1 comprises, for example, a first circumferential conical surface 1321 within the circumferential strip 1320 of the second edge region 132 of the first friction ring 100, and also a second circumferential conical surface 2321 within the circumferential strip 2320 of the second edge region 232 of the second friction ring 200. In this example, the first and the second circumferential conical surfaces both have an inclination angle α relative to the axis A of the brake disc 1 of 45° and a width of 2 mm (i.e., identical within manufacturing tolerances). Furthermore, the present embodiment of the brake disc 1 also comprises a first circumferential convex surface 1311 within the circumferential strip 1310 of the first edge region 131 of the first friction ring 100. The first circumferential convex surface 1311 has, for example, a minimum radius of curvature of 1 mm in a direction perpendicular to the direction of rotation of the first edge region 131 of the first friction ring 100. The brake disc 1 also comprises a second circumferential convex surface 2311 within the circumferential strip 2310 of the first edge region 231 of the second friction ring 200. The second circumferential convex surface 2311 has, for example, a minimum radius of curvature of 1 mm in a direction orthogonal to the direction of rotation of the first edge region 231 of the second friction ring. Further examples of possible ranges for the smallest radii of curvature of the first and second circumferential convex surfaces 1311, 2311 and for the angles of inclination and the widths of each of the first and second circumferential conical surfaces 1321, 2321 are given above. In the illustrated embodiment, both of the circumferential outer lateral surfaces 130, 230 of the first and second friction rings 100, 200 include a circumferential cylindrical surface 1300, 2300. In this example, the circumferential cylindrical surface 1300 of the first friction ring 100 borders the circumferential strips 1310, 1312 of the first and second edge regions 131, 132 of the first friction ring 100. The circumferential cylindrical surface 2300 of the second friction ring 200 borders the circumferential strips 2310, 2312 of the first and second edge regions 231, 232 of the second friction ring 200. In the example shown, each of the first side surfaces 110, 210 of the first and second friction rings 100, 200 contains a respective first circumferential planar surface 112, 212. Each of the first circumferential planar surfaces 112, 212 borders the circumferential strips 1310, 2310 of the first edge regions 131, 231 of the respective first or second friction ring 100, 200. Furthermore, each of the second side surfaces 120, 220 of the first and second friction rings 100, 200 comprises a second circumferential planar surface 122, 222. The second circumferential planar surfaces 122, 222 border the circumferential strips 1320, 2320 of the second edge regions 132, 232 of the respective first or second friction ring 100, 200. The rounded or chamfered circumferential edge areas 131, 132, 231, 232 of the illustrated brake disc 100 result in reduced noise emissions without requiring any other substantial structural deviations from known brake disc configurations. The proposed modifications are not limited to specific brake disc configurations or sizes. Furthermore, the proposed modifications are inexpensive and easy to manufacture. No imbalances are caused by the proposed modifications, and the mechanical stability of the brake disc 1 is maintained. Finally, the friction properties of the brake disc 100 have not been altered because the friction surfaces 111, 211 of the first and second friction rings 100, 200 have not been modified. Reference symbol list: 1 Brake disc 10 Surface of the brake disc 100 First friction ring 200 Second friction ring 110 First side surface of the first friction ring 210 First side surface of the second friction ring 111 Friction surface of the first friction ring 112 First circumferential flat surface of the first friction ring 211 Friction surface of the second friction ring 212 First circumferential flat surface of the second friction ring 120 Second side surface of the first friction ring 220 Second side surface of the second friction ring 121 Ventilation surface of the first friction ring 122 Second circumferential flat surface of the first friction ring 221 Ventilation surface of the second friction ring 222 Second circumferential flat surface of the second friction ring 130 Circumferential outer lateral surface of the first friction ring 230 Circumferential outer lateral surface of the second friction ring 1300 Circumferential cylindrical surface of the first friction ring 2300 Circumferential cylindrical surface of the second friction ring 131 Circumferential first Edge of the first friction ring 231 circumferential first edge of the secondFriction ring 132 circumferential second edge region of the first friction ring 232 circumferential second edge region of the second friction ring 1310 circumferential strip of the first edge region of the first friction ring 1320 circumferential strip of the second edge region of the first friction ring 2310 circumferential strip of the first edge region of the second friction ring 2320 circumferential strip of the second edge region of the second friction ring 1311 circumferential convex or conical surface within circumferential strip of the first edge region of the first friction ring 1321 circumferential convex or conical surface within circumferential strip of the second edge region of the first friction ring 2311 circumferential convex or conical surface within circumferential strip of the first edge region of the second friction ring 2321 circumferential convex or conical surface within circumferential strip of the second edge region of the second friction ring 300 rib 310 cooling channel A axis of the brake disc αInclination angle R Radius of curvature w Width of the circumferential strip of the edge area

Claims

Brake disc (1), comprising: a first friction ring (100) and a second friction ring (200), each of the first friction ring (100) and the second friction ring (200) comprising: a first side surface (110, 210) with a friction surface (111, 211), a second side surface (120, 220) opposite the first side surface (110, 210) and having a ventilation surface (121, 221), a circumferential outer lateral surface (130, 230), a circumferential first edge region (131, 231) between the first side surface (110, 210) and the outer lateral surface (130, 230), and a circumferential second edge region (132, 232) between the second side surface (120, 220) and the outer lateral surface (130, 230). 230), wherein the first friction ring (100) and the second friction ring (200) are arranged coaxially with respect to an axis (A) of the brake disc (1) and parallel to each other, wherein the second side surfaces (120, 220) of the first and second friction ring (100,200) facing each other, the brake disc further comprising: a plurality of ribs (300) arranged between the first friction ring (100) and the second friction ring (200), the ribs (300) connecting the second surfaces (120, 220) of the first friction ring (100) and the second friction ring (200) and forming cooling channels (310), each of the first and second edge regions (130, 230) of the first friction ring (100) and the second friction ring (200) being shaped such that each of the first and second edge regions (130, 230) comprises a circumferential strip (1310, 1320, 2310, 2320) with a width (w) of at least 0.5 mm, in which an orientation of a surface (10) of the brake disc (1) is neither parallel nor orthogonal to the axis (A) of the brake disc (1) is characterized in that the surface (10) of the brake disc (1) has at least one circumferential convex surface (1311, 1321, 2311,2321) within at least one or each of the circumferential strips (1310, 1320, 2310, 2320) of the first and second edge regions (130, 230) of the first and second friction ring (100, 200), wherein at least one or each of the at least one circumferential convex surface (1311, 1321, 2311, 2321) has a minimum radius of curvature (R) in a direction orthogonal to a circumferential direction of the respective first or second edge region (131, 132, 231, 232) of at least 0.25 mm. Brake disc according to claim 1, characterized in that the width (w) of each of the circumferential strips (1310, 1320, 2310, 2320) of the first and second edge regions (131, 132, 231, 232) of the first friction ring (100) and of the second friction ring (200) is at least 1 mm. Brake disc according to one of the preceding claims, characterized in that the surface (10) of the brake disc (1) contains at least one circumferential conical surface (1311, 1321, 2311, 2321) within at least one of the circumferential strips (1310, 1320, 2310, 2320) of the first and second edge regions (130, 230) of the first and second friction ring (100, 200). Brake disc according to claim 3, characterized in that the surface (10) of the brake disc (1) comprises a first circumferential conical surface (1321) within the circumferential strip (1320) of the second edge region (132) of the first friction ring and a second circumferential conical surface (2321) of the circumferential strip (2320) of the second edge region of the second friction ring (200). Brake disc according to one of claims 3 and 4, characterized in that at least one or each of the at least one circumferential conical surface (1311, 1321, 2311, 2321) has an inclination angle (α) relative to the axis of the brake disc within a range of 15° to 75°. Brake disc according to one of claims 3 to 5, characterized in that at least one or each of the at least one circumferential conical surface (1311, 1321, 2311, 2321) has a width (w) of at least 0.5 mm. Brake disc according to one of the preceding claims, characterized in that the surface (10) of the brake disc (1) has a first circumferential convex surface (1311) within the circumferential strip (1310) of the first edge region (131) of the first friction ring (100) and a second circumferential convex surface (2311) within the circumferential strip (2310) of the first edge region (231) of the second friction ring (200), wherein each of the first and second circumferential convex surfaces (1311, 2311) has a minimum radius of curvature (R) in a direction orthogonal to a circumferential direction of the respective first edge region (131, 231) of at least 0.25 mm. Brake disc according to one of the preceding claims, characterized by: a first circumferential convex surface (1311) within the circumferential strip (1310) of the first edge region (130) of the first friction ring (100), wherein the first circumferential convex surface (1311) has a minimum radius of curvature (R) in a direction orthogonal to a direction of rotation of the first edge region (131) of the first friction ring (100) of at least 0.25 mm, a second circumferential convex surface (2311) within the circumferential strip (2310) of the first edge region (231) of the second friction ring (200), wherein the second circumferential convex surface (2310) has a minimum radius of curvature (R) in a direction orthogonal to a direction of rotation of the first edge region (231) of the second friction ring (200) of at least 0.25 mm, a first circumferential conical surface (1321) within the circumferential strip (1320) of the second edge region (132) of the first friction ring (100),wherein the first circumferential conical surface (1321) has an inclination angle (α) relative to the axis (A) of the brake disc (1) within the range of 15° to 75° and a width (w) of at least 0.5 mm, and a second circumferential conical surface (2321) within the circumferential strip (2320) of the second edge region (230) of the second friction ring (200), wherein the second circumferential conical surface (2321) has an inclination angle (α) relative to the axis of the brake disc within the range of 15° to 75° and a width (w) of at least 0.5 mm. Brake disc according to claim 8, characterized in that the smallest radius of curvature (R) of each of the first and second circumferential convex surfaces (1311, 2311) is within a range of 0.8 mm to 1.2 mm, wherein the angle of inclination of each of the first and second circumferential conical surfaces (1321, 2321) is in a range between 43° and 47° and wherein the width (w) of each of the first and second circumferential conical surfaces (1321, 2321) is in a range between 1.7 mm and 2.3 mm.

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