Motorcycle rim

Abstract

The present invention relates to a motorcycle rim (1) with a pivot axis (2), a rim center (3) made of fiber-reinforced material, and a circumferential rim (4). The rim center (3) comprises a hub (5) and a plurality of spokes (6) extending from the hub (5) to the circumferential rim (4), as well as a cup-shaped mounting structure (7) for attaching a brake disc to the rim center (3). The mounting structure (7) comprises an outer wall (9) that at least partially surrounds an interior (8) and, viewed in the direction of the pivot axis (2), has a star-shaped cross-section with at least three outwardly extending star points (11).

Description

AREA OF INVENTION

[0001] The present invention relates to a motorcycle rim. BACKGROUND OF THE INVENTION

[0002] Motorcycle rims play a crucial role in a motorcycle's overall dynamic performance. In particular, their weight has a direct impact on handling, suspension response, general maneuverability, and the overall riding experience.

[0003] To reduce weight, traditional steel rims have given way to modern alternatives made of lightweight alloys or even fiber-reinforced materials. Besides weight reduction, rim development also focuses on ensuring adequate torsional stiffness. Furthermore, the lightweight design should provide robust mounting points for the rim itself or other components such as the brake disc, whose position is often standardized. However, these requirements often conflict with the goals of lightweight design.

[0004] An example of a motorcycle rim can be found in WO2018073005A1, published in 2018 on behalf of the same applicant. It discloses a motorcycle rim with a rim center made of fiber-reinforced material. Here, separate flange rings on both sides are connected to a tubular central section of the rim center to secure the rim and provide additional fastening points.

[0005] The object of the invention is to provide a lightweight motorcycle rim with good torsional stiffness. GENERAL DESCRIPTION OF THE INVENTION

[0006] The present invention relates to a motorcycle rim with an improved power-to-weight ratio compared to rims known from the prior art. This is achieved by an improved shell-like structure, particularly in the area of ​​the rim's center. The technology of the motorcycle rim according to the invention can be implemented as a front wheel with a brake disc on only one side or oppositely on both sides of the wheel, or as a rear wheel with a drive wheel on one side and a brake disc on the opposite side.

[0007] The motorcycle rim has a center section and a circumferential rim. The rim extends around an axis of rotation. The center section comprises a hub and a plurality of spokes extending from the hub to the circumferential rim. At their outer ends, the spokes may be connected to the rim or formed integrally with it. In the context of this disclosure, "connected" means that they are directly or indirectly connected via at least one other part of the motorcycle rim. At their inner ends, the spokes may be formed integrally with the hub.

[0008] To achieve a lightweight structure, at least the center of the rim is made (at least partially or completely) of fiber-reinforced material. The circumferential rim can also be made of fiber-reinforced material. The fiber-reinforced material can be arranged as a shell-like structure. Advantageously, the fiber-reinforced material comprises layered fiber sheets embedded in a matrix material such as resin. These layers form the shell-like structure, if present. For a particularly strong yet lightweight structure, the fiber-reinforced material can include at least one stitched fiber structure. Such stitched fiber structures can be produced, for example, by multiaxial warp knitting or by TFP (Tailored Fiber Placement) and are particularly advantageous for achieving out-of-plane stiffness and strength and significantly improving three-dimensional load-bearing capacity.The stitched fiber structure can be embedded in the same matrix material as the layered fiber sheets. The stitched fiber structure can comprise a three-dimensional network of fiber strands. Unidirectional fiber strands can also be integrated into the stitched fiber structure if desired. The use of layers and / or stitched fiber structures thus results in an overall stronger structure compared to, for example, rims made of unconnected short fibers embedded in plastic.

[0009] The wheel according to the invention further comprises a mounting structure for attaching a brake disc to the rim center, with bores arranged in the mounting structure for receiving mounting bolts for securing the brake disc. Preferably, the mounting structure is an integral part of the rim center. Therefore, the mounting structure is advantageously made (at least partially or completely) of fiber-reinforced material. In contrast to conventional rims, in which the mounting structure is generally integrated into a metallic insert that spans and covers a larger area of ​​the rim center, an integral design of the mounting structure within the fiber-reinforced material results in a significantly lighter rim design.The mounting structure according to the present disclosure comprises an outer wall that extends, in particular integrally, from the spokes and / or the hub in the direction of the axis of rotation and transitions into an end face of the mounting structure. The extension of the mounting structure from the spokes and / or the hub provides sufficient space for, for example, brake pads arranged between the spokes and the brake disc. In a mounted position of the brake disc, the end face is oriented towards the brake disc, which is preferably located on the end face. The outer wall adjacent to the end face is preferably rotationally symmetrical with respect to the axis of rotation of the wheel. Rotationally symmetrical design means that the shape of the outer wall is identical to itself after a rotation of less than 360°. Such a design facilitates easy mounting of the brake disc.The outer wall transitions into the hub and / or spokes at a proximal end – relative to a central plane of the wheel. This central plane is perpendicular to the axis of rotation and is located at the center of the rim. At a distal end, the outer wall transitions into the face (with the proximal end of the outer wall being closer to the central plane than the distal end). The face can be three-dimensionally shaped, for example, by not being flat and including protrusions, recesses, or reinforcing ribs. Depending on the application, a central portion of the mounting structure may be located further from the central plane of the rim than a radially outer portion of the face.

[0010] A cross-section of the outer wall of the mounting structure is preferably star-shaped when viewed in the direction of the axis of rotation, with at least three points of the star extending outwards. The bores for mounting the brake disc are advantageously located in the outer region of the star points. This arrangement and structural design of the outer wall allows the bores to be positioned at a greater distance from the axis of rotation and provides good structural rigidity. In contrast, if the bores in conventional metal inserts are positioned at a similarly large distance from the axis of rotation, the wheel inevitably becomes unnecessarily heavy due to the greater distance.

[0011] In addition to the outer wall, the end face can also be star-shaped. In this way, a mounted brake disc is only partially positioned next to the end face, as the brake disc is exposed to a cooling space between the points of the star, which allows for better air circulation around the brake disc and thus leads to improved cooling.

[0012] For improved structural rigidity, the outer wall around the star points and / or the transition areas between adjacent star points can be rounded. Advantageously, the star points of the mounting structure align with the spokes of the rim's center. If the spokes extend radially, for example, along a specific dimension of each spoke, the star point located on that spoke can point into that dimension.

[0013] The points of the star are preferably positioned in the center of each spoke when viewed from the direction of the axis of rotation. If the spokes are curved radially, other arrangements of the star-shaped structure are also possible. Depending on the application, the number of points can be the same as the number of spokes. Thus, the fastening structure can have, for example, five or six points, depending on the wheel design.

[0014] For a lightweight design, the motorcycle rim preferably includes an interior space. This interior space can be hollow or at least partially filled with a material such as foam or a honeycomb structure. Preferably, the mounting structure at least partially encloses the interior space. To form the interior space, the mounting structure can be shell-shaped and have a comparatively thin wall. The shell of the mounting structure can comprise fiber-reinforced material, in particular several layers of fibers embedded in a matrix material. Preferably, the cross-section of the interior space within the mounting structure increases in the direction of the axis of rotation and towards the median plane of the rim's center. Advantageously, the interior space extends at least partially from the mounting structure into the hub and, optionally, from the hub into the spokes.However, the interior space can also extend directly from the mounting structure into the spokes.

[0015] Due to its complex geometry, the interior is preferably designed to be constructed using a removable core. Therefore, the cross-sections of the respective interior parts of the mounting structure and / or the hub and / or the spokes preferably widen towards the transition areas between the hub and the spokes and / or between the mounting structure and the hub and / or between the mounting structure and the spokes. Such a design allows for easy removal of the core with minimal core residue.

[0016] To create solid mounting points for the mounting bolts, the holes can be arranged in mounting inserts on the motorcycle rim. The use of mounting inserts can also prevent corrosion between the fiber-reinforced material and the mounting bolts. The individual mounting inserts are arranged radially at a distance from the center axis and spaced apart from each other. Each mounting insert can include a bushing that forms the respective hole. The bushing can extend along the entire length of the outer wall of the mounting structure in the direction of the axis of rotation. The outer wall can at least partially surround the bushing. The outer wall can be spaced away from the bushing, allowing parts of the interior to be positioned radially between the bushing and the outer wall.Alternatively, the bushing can be enclosed by the outer wall (without an interior space between the bushing and the outer wall). Furthermore, the outer wall can form at least a partial bulge around the bushing, as explained in more detail below.

[0017] Depending on the application, the outer surface of the bushing may be at least partially conical. The outer circumference of the conical bushing may slope towards the center of the rim. Alternatively, a hollow cylindrical bushing is also possible. Furthermore, the mounting insert may include a collar that (with its back side) rests against the face of the mounting structure to prevent the mounting insert from slipping into the interior. A groove may be present on the circumference of the bushing and next to the collar, into which the fiber strands and / or the stitched fiber structure engage. For securing the brake disc, the mounting inserts may have an interface, particularly on the front of the collar, that surrounds the bores. Advantageously, the mounting interface is spaced away from the face of the mounting structure.The mounting inserts can be made at least partially from a single material, such as metal or ceramic. Alternatively or additionally, a heat-insulating material can also be used.

[0018] Depending on the design, the mounting inserts, and in particular the respective bushings of the mounting inserts, can extend into the interior. This means that the interior surrounds the bushing over at least part of its length. In some applications, the interior can surround the bushing over most of its length, even over more than 75%.

[0019] Depending on the application, the rim center may have a central opening in the mounting structure. At least one central insert may be at least partially housed in this central opening. This central insert serves to receive the axle of the motorcycle rim. The central insert may include a through opening extending across it. Furthermore, the central insert may include a bearing seat for a bearing for the motorcycle rim axle. The bearing seat may be located within the through opening. The central insert may also include an outer flange section. This outer flange section preferably abuts (with a rear face of the flange section) the respective end face of the mounting structure. Additionally, the central insert may include an inner flange section, as explained in more detail below.In the direction of the axis of rotation, the inner flange part can be positioned closer to the wheel's center plane than the bearing seat. Furthermore, a shoulder of the central insert can be positioned between the bearing seat and the inner flange part in the direction of the axis of rotation to serve as an axial stop for the bearing.

[0020] Depending on the application, the motorcycle rim can include two central inserts, which are at least partially located within the central opening. These central inserts can be positioned opposite each other relative to the hub. It is advantageous for the two central inserts to be connected either directly or indirectly. This connection ensures more stable force transmission, particularly during manufacturing, and especially when pressing the bearing into the bearing seat. A very stable construction is achieved when the two central inserts are connected directly or indirectly and, in addition, one or more mounting inserts are connected internally, as explained in more detail below. In the case of a direct connection between the two central inserts, they can be clamped together to prevent noise during use.Alternatively or additionally, other connections such as screw connections and / or adhesive can be used. In the case of an indirect connection of the two central inserts (first and second central insert), the (first and second) central inserts can be connected to each other via a connecting element. The connecting element can be clamped to the respective central inserts to prevent noise during use. Alternatively or additionally, other connections such as screw connections and / or adhesive can be used.

[0021] The connecting element can be arranged between the respective central inserts in the direction of the axis of rotation. The connecting element thus extends through the wheel and, in particular, through the interior. In the radial direction, the connecting element can therefore be partially or completely enclosed by the interior. Preferably, the connecting element is enclosed by the interior for at least 80% of its length (in the direction of the axis of rotation).

[0022] Depending on the application, the connecting element can have at least a partially hollow cylindrical shape in the direction of the axis of rotation. The respective central insert with its inner flange can be located within one end of the connecting element. Thus, the first central insert with its inner flange can be located in the first end of the connecting element, and / or the second central insert with its inner flange can be located in the second end. Alternatively, either the first or second end of the connecting element can be received in the through-hole. If necessary, the first and / or second end of the connecting element that is received in the through-hole of one of the central inserts can serve as a shoulder, acting as an axial stop for the bearing.

[0023] Depending on the application, a groove may be present around the circumference of the central insert. In particular, the groove may be located next to the outer flange section. The fiber strands and / or the stitched fiber structure can engage further in this groove of the central insert. Additional mounting points for attaching a motorcycle rim axle may be present on the outer flange section. Preferably, the mounting interface described above is located closer to the central plane than the front face of the outer flange section. The distance of the mounting interface from the end face serves to improve access to the mounted brake disc. Furthermore, the central insert may also extend into the interior and / or be at least partially enclosed by the interior. If the interior is designed to be constructed using a dissolvable core, the dissolvable core material can be removed through the central opening.In the case of a star-shaped outer wall and / or front surface, an outer contour of the star points of the outer wall extends essentially tangentially from the central opening.

[0024] For added structural rigidity, one or more stiffening ribs can be arranged on the end face. A stiffening rib can, for example, surround the central opening and / or the outer flange of the central insert. Alternatively or additionally, the star points can be framed by stiffening ribs on the end face. These stiffening ribs can extend tangentially from the central opening. Additional stiffening ribs can frame transition areas of the end face between adjacent star points. Depending on the design, the height of the stiffening ribs can vary. Preferably, the stiffening ribs decrease in height around the star points in the direction of the respective star points.

[0025] Depending on the application, the fiber-reinforced material of the fastening structure can comprise fiber strands, in particular unidirectional fiber strands, that at least partially or completely enclose the central opening and / or the fastening openings. The respective fiber strands can be arranged in a stitched fiber structure. The stitched fiber structure can thus at least partially enclose the central opening and / or the bores or fastening openings (e.g., in the respective grooves, if present). Preferably, the stitched fiber structure comprises loops, each loop at least partially enclosing a corresponding fastening opening. The loops are connected to the part of the stitched fiber structure that partially or completely encloses the central opening. Depending on the application, the stitched fiber structure can...The fiber strands can be arranged on or within a wall of the fastening structure, which consists of layered fiber sheets of the reinforced fiber material. The stitched fiber structure and / or the fiber strands can be located, for example, on the inside or outside of the (layered) wall. If stiffening ribs (as described above) are present, the fiber strands can be aligned with the stiffening ribs.

[0026] Depending on the application, the mounting inserts can be connected to each other by a cover. The cover can be attached, particularly by adhesive bonding, to at least parts of the end face. Preferably, the cover completely covers the end face and can even extend around the corners of the end face to cover the distal end of the outer wall. The bushings of the mounting inserts thus extend from a rear side of the cover and in the direction of the axis of rotation. The cover can also be made of the same material as the mounting inserts. For example, the cover can be forged. When using a cover, it can be advantageous if the shell-shaped mounting structure also includes bulges that partially or completely enclose the bushings.

[0027] A preferred embodiment of the motorcycle rim comprises a cup-shaped mounting structure for attaching a brake disc to the rim's center, with bores arranged on the outer edges of the star-shaped points for receiving a mounting bolt when installed. The outer wall of the mounting structure surrounds the interior and, viewed along the axis of rotation, has a star-shaped cross-section, with at least three points extending outwards.

[0028] Depending on the application, the motorcycle rim can comprise two mounting structures (according to the variant described above) arranged opposite each other with respect to the hub. This is particularly advantageous when the motorcycle rim is a front wheel rim. The two mounting structures can be mirror images of each other in the central plane but identical in construction. However, different designs of the two mounting structures can also be chosen. Preferably, both mounting structures (first and second mounting structure) are star-shaped, with their outer walls aligned with each other. Alternatively or additionally, the mounting inserts and the central inserts arranged on the first and second sides are advantageously arranged coaxially with each other.

[0029] A stable structure can be achieved if the mounting inserts arranged on the first and second mounting structures are coaxially aligned and connected to each other, particularly through their interior. The (first) mounting inserts can have an external thread on one side of the rim center, and the (second) mounting inserts can have an internal thread on the opposite side of the rim center, designed to engage with the respective external thread (or vice versa). For assembly of the (first and / or second) mounting inserts, they can have a tool interface. This tool interface can be located, for example, at the base of the bore for tool insertion and / or on the outer circumference of the bushing.The outer surface of each bushing can also be conically shaped in the case of interconnected mounting inserts, as explained above. Alternatively or in addition to the screw connection, the first and second mounting inserts can be glued together, particularly in the area of ​​the screw connection.

[0030] Alternatively, the coaxial mounting inserts can each be connected to each other by a spacer. The spacer can be a bushing with one or two internal threads that engage with the respective threads of the coaxial mounting inserts. In an alternative embodiment, each mounting insert can extend through the center of the rim and have a bore at each end for mounting a brake disc on either side. Furthermore, the screw connections of the spacer to the respective mounting inserts can be reinforced by using an additional adhesive.

[0031] Depending on the application, it can be advantageous for the mounting structure to include bulges that extend at least partially around the respective mounting inserts and from the inside of the mounting structure towards the axis of rotation. The inside of the mounting structure is opposite the end face with respect to the shell-shaped wall of the mounting structure. The bulges can extend from the inside of the mounting structure into the interior to accommodate at least part or all of the mounting inserts. In the assembled position, the bulges can partially or completely enclose the respective mounting inserts. This provides additional stability to the mounting structure. The bulges can also be shell-shaped.The protrusions can be cylindrical or have at least one conical section, with the smallest diameter located in the median plane of the rim's center. Alternatively or additionally, the outer wall of the mounting structure can surround the mounting insert and, in particular, the bushing, and at least partially form part of the protrusion. In this way, the protrusion at least partially surrounds the mounting insert and, in particular, the bushing in the direction of the axis of rotation and abuts it. Similarly, another (central) protrusion can be arranged at least partially around the central insert(s).When two coaxial and interconnected mounting inserts are used, where the respective protrusions completely enclose the interconnected mounting inserts, the first and second mounting structures are connected by the protrusions extending through the interior, giving the structure additional stiffness.

[0032] As mentioned above, the hub and / or spokes can also be cup-shaped and partially enclose the interior. The cup-shaped hub can comprise several hub wall segments, with each segment connecting two adjacent spokes. Depending on the design, the hub wall can also enclose the axis of rotation and have an opening for each spoke into its interior. The respective hub wall or hub wall segments can transition into the outer wall of the mounting structure.

[0033] It is understood that both the preceding general description and the following detailed description represent embodiments and are intended to provide an overview or framework for understanding the nature and character of the disclosure. The accompanying drawings provide further understanding and form part of this description. The drawings illustrate various embodiments and, together with the description, serve to explain the principles and operation of the disclosed concepts. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The invention described herein is better understood with the help of the following detailed description and the accompanying drawings, which are not to be considered as limiting the invention described in the attached claims. The drawings show: Fig. 1 A first variant of the motorcycle rim according to the invention in a partially cutaway and perspective view; Fig. 2 The rim according to Fig. 1 in a front view. Fig. 3 A section view A - A according to Fig. 2, which shows the mounting inserts. Fig. 4 A first variant of an alternative design for the fastening inserts; Fig. 5 A second variant of an alternative design for the fastening inserts; Fig. 6 A second variant of the motorcycle rim according to the invention in a perspective view; Fig. 7 A third variant of the motorcycle rim according to the invention in a perspective and partially cutaway view; Fig. 8 A detail of the variation of the motorcycle rim according to Fig. 7 in a sectional view; Fig. 9 A fourth variant of the motorcycle rim according to the invention in a sectional view. DESCRIPTION OF THE EXECUTION FORMS

[0035] Reference is now made in detail to specific embodiments, which are illustrated by way of example in the accompanying drawings, showing some, but not all, of their features. In fact, the embodiments disclosed herein can be embodied in many different forms and should not be understood as being limited to those presented here; rather, these embodiments are provided so that this disclosure complies with applicable legal requirements. Wherever possible, reference numbers are used to refer to identical components or parts.

[0036] Fig. 1 - Fig. Figure 3 shows a first embodiment of a motorcycle rim 1 according to the invention. The motorcycle rim 1 comprises a rim center 3 and a circumferential rim 4 extending about an axis of rotation 2. The rim center 3 comprises a hub 5 and a plurality of spokes 6 extending from the hub 5 to the circumferential rim 4. The rim center 3 further comprises a fastening structure 7 arranged on the hub 5 and the spokes 6. Preferably, the rim center 3 and the rim 4 are integrally connected and both comprise fiber-reinforced material.

[0037] The mounting structure 7 is shell-shaped and at least partially encloses an interior space 8 of the motorcycle rim 1. The interior space 8 extends further into the hub 5 and the spokes 6. Therefore, the spokes 6 and the hub 5 can also be shell-shaped, as shown. The mounting structure 7 comprises an outer wall 9 that extends around the axis of rotation 2. The outer wall 9 merges into the hub 5 and the spokes 6 at a proximal end and into the end face 10 at a distal end. Viewed in the direction of the axis of rotation 2, the outer wall 9 has a star-shaped cross-section with at least three points 11 extending outwards. In the illustrated version, there are five points 11. Accordingly, the end face 10 is also star-shaped when viewed in the direction of the axis of rotation 2.

[0038] The end face 10 has a central opening 18 and several mounting holes 14. The mounting holes 14 are preferably located in the outer region of the star tips 11. In addition, several stiffening ribs 20 may be located on the end face 10. While the central opening 18 serves to receive a central insert 17, the mounting holes 14 each serve to receive a mounting insert 13 for securing the brake disc. The central insert 17 and / or a bushing 15 of the respective mounting inserts 13 extend in the direction of the axis of rotation 2. The central insert 18 also includes an outer flange part 28 that abuts the end face 10. Furthermore, each mounting insert includes a collar 16 that abuts the end face 10. The bushings 15 also enclose a bore 12 to receive a mounting bolt in a mounted position.

[0039] The bushings 15 can be conically shaped, as in Fig. 1 and Fig. 3 can be seen. The outer circumference of the conically shaped bushing 15 slopes down towards a central plane 27 of the rim center 3.

[0040] Depending on the application, other versions of the fastening inserts 13 are also possible, as shown in Fig. 4 and Fig. 5 shown. If, for example, two fastening structures are present on opposite sides of the rim center 3, the fastening inserts 13a arranged in the first fastening structure and the fastening inserts arranged in the second fastening structure 13b can be aligned coaxially with each other. Furthermore, the coaxial fastening inserts 13a, 13b can be connected to each other, as shown in Fig. Figure 4 shows that the fastening inserts 13a on one side of the rim center 3 each comprise an external thread 22, and the fastening inserts 13b on the opposite side of the rim center 3 each comprise an internal thread 23 that can engage with the respective external thread 22 (or vice versa). In an alternative embodiment, which is shown in Fig. As shown in Figure 5, the respective mounting inserts 13 can extend through the rim center 3, which has a bore 12 at both ends for mounting a brake disc. In each variant, the cup-shaped mounting structure 7 can extend around the respective mounting inserts 13. Thus, in the Fig. 4 and Fig. In the 5 variants shown, the first and second fastening structures 7a, 7b are connected to each other by protrusions 26 that enclose the fastening inserts 13. However, variants are also possible in which the protrusions only partially enclose the respective fastening inserts 13 (whereby the protrusions do not connect the first and second fastening structures 7a, 7b to each other).

[0041] Fig. Figure 6 shows a second embodiment of a motorcycle rim 1 according to the invention. The second embodiment differs from the first embodiment in that the mounting inserts 13 (on one side of the rim center 3) are connected to one another by a cover 25. The cover 25 is attached to the end face 10 of the mounting structure 7 and covers the end face 10 and preferably the distal end of the outer wall 9. Furthermore, the mounting inserts for each bore can include a collar with an interface extending over an outer surface of the cover. The cover 25 also has a central cutout, such as the central opening 18 of the rim center 3, which is visible. In addition, the cup-shaped mounting structure 7 can also include cup-shaped protrusions 26 that partially or completely enclose the mounting inserts 13, which are connected to one another by the cover 25.

[0042] Fig. 7 and Fig. Figure 8 shows a third variant of a motorcycle rim 1 according to the invention. The motorcycle rim 1 comprises a rim center 3 and a circumferential rim edge 4 extending about an axis of rotation 2. The rim center 3 comprises a hub 5 and a plurality of spokes 6 extending from the hub 5 to the circumferential rim 4. The rim center 3 further comprises a fastening structure 7 arranged on the hub 5 and the spokes 6. Preferably, the rim center 3 and the rim 4 are integrally connected and both comprise fiber-reinforced material.

[0043] The mounting structure 7 is shell-shaped and at least partially encloses an interior space 8 of the motorcycle rim 1. The interior space 8 also extends into the hub 5 and the spokes 6. Therefore, the spokes 6 and the hub 5 can also be shell-shaped, as shown. The mounting structure 7 comprises an outer wall 9 that extends around the axis of rotation 2. The outer wall 9 merges into the hub 5 and the spokes 6 at a proximal end and into the end face at a distal end. Viewed in the direction of the axis of rotation 2, the outer wall 9 has a star-shaped cross-section with at least three points 11 extending outwards. A central opening 18 and several mounting openings are arranged in the end face.

[0044] The mounting openings each serve to receive a mounting insert 13 for securing the brake disc. The mounting openings are preferably arranged in the outer region of the star points 11. Stiffening ribs 20 may be arranged on the end face. A bushing 15 of each mounting insert 13 extends in the direction of the axis of rotation 2. The mounting insert 13 also includes a collar 16 that rests against the end face 10. The bushings 15 also each enclose a bore 12 for receiving a mounting bolt in a mounted position. Depending on the application, two mounting structures 7 may be present on opposite sides of the rim center 3. The mounting inserts 13 in the first and second mounting structures 7 may be arranged coaxially and connected to each other, as described in connection with Fig. 4 explained. In the variant according to Fig. The protrusions 26 only partially enclose the respective fastening inserts 13. Therefore, the protrusions 26 do not connect the first and second fastening structures 7a, 7b. The respective protrusions 26 extend from the end face 10 of the fastening structure 7 into the interior 8. In the variant shown, the interior remains partially between the respective protrusions 26 and the outer wall 9. However, this area can also be filled with fiber-reinforced material.

[0045] The central opening 18 serves to receive at least one central insert 17. In the illustrated variant, two central inserts 17 are arranged in the central opening 18, opposite each other with respect to the hub 5. Each central insert 18 also comprises an outer flange section 28, which abuts the respective mounting structures 7 located on both sides of the rim 1. The central inserts 17 also extend at least partially in the direction of the axis of rotation 2. Depending on the application, the central insert 17 may extend at least partially into the interior and / or be enclosed by a central bulge 26. The central inserts may also be connected to each other directly or, as shown, indirectly via a connecting element 29. The connecting element 29 is connected at one end to the first central insert 17 and at the other end to the second central insert 17.For the connection, the respective first or second end of the connecting element 29 can be received on a respective inner flange part of the central insert 17 (as shown) or received in a respective central opening of the central insert 17.

[0046] Fig. Figure 9 shows a fourth variant of a motorcycle rim 1 according to the invention in a sectional view (only the upper half of the rim is shown). The construction of the motorcycle rim 1 essentially corresponds to the variant of the motorcycle rim 1 as shown in Figure 9. Fig. As explained in section 8, the individual geometry of the hub 5, the spokes 6, and the surrounding rim 4 differs slightly. In the variant shown, the bulges 26 around the mounting inserts 13 are also partially formed by the outer wall 9 of the mounting structure 7. Furthermore, a wedge-shaped central bulge 26 made of fiber-reinforced material is arranged around the central insert 17 to stabilize and secure it. The respective bulges 26 around the mounting inserts 13 and the central bulge 26 both extend from the end face 10 of the mounting structure 7 into the interior 8.

[0047] The shell-shaped fastening structures 7 of the respective variants can comprise several layers of fiber layups embedded in a matrix material, forming a layered wall. Depending on the application, the fiber-reinforced material of the shell-shaped fastening structure 7 can further comprise fiber strands 21, in particular unidirectional fiber strands. Preferably, the fiber strands 21 at least partially enclose the central opening 18 and / or at least partially a fastening opening 14. Such a structure is, for example, in Fig. 1 or Fig. 6 in a perspective view or in Fig. 3 or Fig.Figure 9 shows a cutaway view. However, such a structure of the fiber strands is possible in all embodiments shown. As illustrated, the fiber strands 21 can be arranged along an inner surface 24 of the layered wall facing the interior 8. The fiber strands 21 extend tangentially from the central opening 18 to the respective fastening openings 14. The fiber strands 21 thus frame the star-shaped geometry of the fastening structure 7. However, other arrangements are also possible, e.g., in the stiffening ribs. As explained above, the fiber strands 21 shown can be sewn together to form a stitched fiber structure 19.

[0048] The words used in the description are descriptive rather than restrictive, and it is understood that various modifications can be made without deviating from the scope of the invention. LIST OF TERMS 1 motorcycle rim 2. Axis of rotation 3 Rim center 4 Circumferential rim 5 hub 6 spokes 7 Mounting structure 8 Interior 9 Outer wall 10 Front surface 11 star points 12 holes 13 mounting inserts 14 Mounting opening 15 sockets 16 collars 17 Central Deployment 18 Central Opening 19 Stitched fiber structure 20 stiffening ribs 21 fiber strands 22 external threads 23 internal threads 24 Inside 25 Cover 26 bulge 27 Middle level 28 Outer flange part 29 Connecting element 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] WO 2018073005A1

[0004]

Claims

[1] Motorcycle rim (1) with a rim center (3) made of fiber-reinforced material and a circumferential rim (4), a. the rim center (3) comprising a hub (5) and a plurality of spokes (6) extending from the hub (5) to the circumferential rim (4), and a cup-shaped mounting structure (7) for attaching a brake disc to the rim center (3), the mounting structure (7) comprising an outer wall (9) which at least partially encloses an interior (8) and has a star-shaped cross-section when viewed in the direction of an axis of rotation (2) of the motorcycle rim (1), with at least three star points (11) extending outwards, wherein b. in the area of ​​the star tips (11) bores (12) are arranged for receiving one fastening bolt each. [2] Motorcycle rim (1) according to claim 1, characterized by, that the shell-shaped fastening structure (7) has a star-shaped end face (10) when viewed in the direction of the axis of rotation (2) of the rim. [3] Motorcycle rim (1) according to claim 2, characterized by , that fastening inserts (13) for fastening the brake disc are arranged within the front face (10). [4] Motorcycle rim (1) according to claim 3, characterized by , that the fastening inserts (13) each comprise a bushing (15) surrounding the respective bores (12). [5] Motorcycle rim (1) according to claim 4, characterized by , that the fastening inserts (13) and in particular the respective bushings (15) of the fastening inserts (13) extend into the interior (8). [6] Motorcycle rim (1) according to claim 4 or 5, characterized by , that an outer surface of the respective socket (15) is at least partially conical. [7] Motorcycle rim (1) according to any one of claims 3 to 6, characterized by, that the fastening inserts (13) extend through the rim center (3) in the direction of the axis of rotation (2). [8] Motorcycle rim (1) according to any one of claims 3 to 7, characterized by , that the fastening inserts (13) are connected to each other via a cover (25) which is attached at least to parts of the end face (10). [9] Motorcycle rim (1) according to claim 8, characterized by that the fastening inserts (13) and / or the cover (25) are made of a single material. [10] Motorcycle rim (1) according to any one of the preceding claims, characterized by , that the star points (11) of the fastening structure (7) are aligned with the spokes (6) of the rim center (3). [11] Motorcycle rim (1) according to any one of the preceding claims, characterized by, that a central opening (18) of the rim center (3) is arranged in the fastening structure (7) which at least partially accommodates a central insert (17) which extends into the interior (8). [12] Motorcycle rim (1) according to claim 11, characterized by , that the interior (8) is designed such that it can be produced by applying layers of fibers to a core of a soluble material, which can be removed through the central opening (18) after the hardening of a matrix material surrounding the fibers. [13] Motorcycle rim (1) according to claim 11 or 12, characterized by , that an outer contour of the star tips (11), viewed in the direction of the axis of rotation, extends essentially tangentially from the central aperture (18). [14] Motorcycle rim (1) according to one of claims 11 to 13, characterized by, that the motorcycle rim (1) comprises two central inserts (17) which are at least partially located within the central opening (18) and are arranged opposite each other with respect to the hub (5). [15] Motorcycle rim (1) according to claim 14, characterized by , that the two central inserts (17) are connected directly to each other or indirectly via a connecting element (29) which extends through the rim (1) and in particular through the interior (8). [16] Motorcycle rim (1) according to any one of the preceding claims, characterized by , that the interior (8) extends at least partially into the spokes (6) and / or the hub (5). [17] Motorcycle rim (1) according to any one of the preceding claims, characterized by , that a cross-section of the interior (8) of the fastening structure (7) increases in the direction of the axis of rotation (2) and in the direction of a median plane (27) of the rim center (3). [18] Motorcycle rim (1) according to any one of the preceding claims, characterized by , that the fiber-reinforced material comprises fiber strands (21), in particular unidirectional fiber strands, which at least partially surround a / the central opening (18) and / or at least partially a fastening opening (14). [19] Motorcycle rim (1) according to claim 18, characterized by , that the fiber strands (21) of the fiber-reinforced material are arranged in a sewn fiber structure (19). [20] Motorcycle rim (1) according to any one of the preceding claims, characterized by , that the motorcycle rim (1) comprises two fastening structures (7) which are arranged opposite each other with respect to the hub (5) and each extend outwards from the hub (5) and / or the spokes (6) in the direction of the axis of rotation (2).

Images