Hollow chamber wheel made of a fiber composite material for a vehicle

Description

[0001] The invention relates to a hollow chamber rim for a vehicle according to the preamble of claim 1. A corresponding hollow chamber rim is known, for example, from the document US 2018 / 361785 A1.

[0002] Rims made of fiber composite material are already known from the prior art. They are the part of the wheel that forms a ring-shaped profile, accommodates the tire, and is connected to the wheel hub via spokes. They are particularly manufactured from fiber composite material when the vehicle's weight needs to be reduced. Fiber composite materials are characterized by their lightness and high rigidity. To further reduce weight while maintaining stability, the rims are designed as hollow chamber rims. The rims known from the prior art have radially outer tire engagement sections that grip the tires laterally.

[0003] According to the current state of the art, hollow-wall rims made of fiber composite materials are constructed in two parts. First, the body of the hollow-wall rim is manufactured, and in a subsequent step, the radially outer tire engagement sections are attached. These are designed to be narrow, similar to the aluminum hollow-wall rim.

[0004] The radially outer tire engagement sections on hollow-wall rims made of fiber composite material have proven to be a disadvantage. Due to the way they are attached, the individual layers of the radially outer tire engagement sections point radially outwards. Forces acting on these layer ends cause delamination of the hollow-wall rim. Even with subsequent normal stress, this delamination can spread to such an extent that the hollow-wall rim is ultimately destroyed. In addition, the small contact surface of the sidewall of the hollow-wall rim has proven to be disadvantageous. External influences and / or impacts in this area are very difficult to transmit and therefore often lead to damage to the hollow-wall rim. Impacts on the hollow-wall rim are caused in particular, but not exclusively, by unevenness in the surface on which the tire attached to the hollow-wall rim rolls.Especially at low air pressures, the tire can be compressed so much that the hollow rim comes into contact with the bump directly or only separated by the tire material. In this case, not only the individual elements and / or areas of the hollow rim but also the tire itself can be damaged, for example, by the radially outer tire contact areas.

[0005] There is therefore a great need for a simple, lightweight, stable, safe, non-delaminating hollow-wall rim made of a fiber composite material that is resistant to external influences and / or impacts and suitable for a wide variety of vehicles. Furthermore, the hollow-wall rim should be adaptable to the corresponding and / or required conditions of the preferred application as well as the user's wishes. Furthermore, the hollow-wall rim should be cost-effective to manufacture, durable, resistant to failure, low-maintenance, and easy to mount with the tire. The invention therefore sets itself the task of providing a hollow-wall rim to overcome the aforementioned difficulties and, above all, to reliably dissipate the external influences and / or impacts that occur during intended use while simultaneously protecting it from delamination.

[0006] This problem is solved in a surprisingly simple but effective manner by a hollow chamber rim according to the teaching of the independent main claim 1.

[0007] According to the invention, a hollow chamber rim for a vehicle is proposed, which comprises a first radially outer tire engagement portion having a first tire holding portion with a first outer wall, and a second radially outer tire engagement portion spaced from the first radially outer tire engagement portion and having a second tire holding portion with a second outer wall. The hollow chamber rim is formed from a fiber composite material with at least two layers. The hollow chamber rim is designed as one piece with the first radially outer tire engagement portion and the second radially outer tire engagement portion, and the first outer wall has a curvature in the direction of the first tire holding portion, and the second outer wall has a curvature in the direction of the second tire holding portion.

[0008] The hollow chamber rim according to the invention is based on the fundamental idea that the effect of an external influence and / or impact on the fiber composite material is reduced by lessening the direct impact on an edge of the layers of the fiber composite material, so that the force of the external influences and / or impacts in this area cannot act on the individual layers of the fiber composite material in directions pointing away from one another. Furthermore, it makes it possible to offer an external influence and / or impact the largest possible contact surface in order to minimize point loading. These two approaches are realized with the help of the special geometric design of the hollow chamber rim, including the radially outer tire engagement sections, in that the particularly stressed radially outer tire engagement sections are not narrow, but significantly widened and curved on the outer walls.This curvature enlarges the hollow chamber into the radially outer tire engagement sections. This makes it possible to continuously guide the individual layers of the fiber composite material across the entire profile of the hollow chamber rim and to design the hollow chamber rim as a single piece. "Continuous" means that the individual layer ends in the layer system are offset from one another and, in particular, do not end at the same point, thus forming a terminating edge. Furthermore, due to its geometry, the hollow chamber rim according to the invention has no exposed edge at which an external influence and / or impact can act, in particular no edge at which a plurality of layers end. In addition, the curvature of the radially outer tire engagement sections provides a maximum contact surface for an external influence and / or impact.This allows the force to be dissipated over a large area, significantly reducing the risk of overloading the material. Within the scope of the invention, it was also recognized that the curved design of the radially outer tire engagement sections eliminates the possibility of damage to the tire.

[0009] According to the invention, the hollow chamber rim has a first radially outer tire engagement portion, which has a first tire holding portion with a first outer wall, and a second radially outer tire engagement portion, which is spaced apart from the first radially outer tire engagement portion and also has a second tire holding portion with a second outer wall. The main task of the first and second radially outer tire engagement portions is to hold the tire in its position. For this purpose, the tire is placed at the spacing between the first and second radially outer tire engagement portions. The tire, which is placed between the radially outer tire engagement portions, rests against the tire holding portions.It has been recognized as essential to the invention that the hollow chamber rim is formed in one piece with the first radially outer tire engagement section and the second radially outer tire engagement section.

[0010] A "tire" refers to the part of the wheel that has circumferential contact with the road surface. It consists of a casing and a tube ("clincher tire"), with one design combining the casing and tube ("tubular tire"), and another design omitting the tube ("tubeless tire").

[0011] Furthermore, it has been recognized as essential to the invention that the first outer wall has a curvature in the direction of the first tire holding section and the second outer wall has a curvature in the direction of the second tire holding section.

[0012] The term "curvature," in its simplest form, refers to the local and continuous deviation of a curve from a straight line. Using the curvature measure, the differential quotient of the angle of the curve normal to the length of the corresponding curve segment, the local deviation can be quantitatively specified for each point on the curve. If the curvature measure is not zero at a point, the inverse of the curvature measure at that point is called the radius of curvature. According to the invention, the degree of the deviation can vary along the course of the curvature, but not in its direction. A curvature in the direction of a specific point means that the local deviation of the curve occurs in such a way that the curve, or its continuous tangent at the end of the curve, reaches the specific point via a shorter path or passes it at a shorter distance after the deviation.

[0013] The hollow-chamber rim according to the invention is made of a fiber composite material with at least two layers. The term "hollow-chamber rim" refers to a rim with a double rim arch. A hollow space, the hollow chamber, is enclosed between these rim arches. This achieves sufficient stability with lower weight. In general, hollow-chamber rims can be made of any sufficiently stable material.

[0014] Within the scope of the invention, the contents of the hollow chamber are arbitrary. It is preferably conceivable for the hollow chamber to be completely or partially filled with at least one medium. The medium is, for example, a gas or gas mixture, such as air, a plastic, in particular a foam, a gel, and / or a mixture thereof, wherein the medium has a lower density than the surrounding material. The hollow chamber rim can also be filled with two, three, four, five, six, or more media.

[0015] The term "fiber composite material" refers to a composite material consisting of fibers known from the state of the art embedded in a matrix. The fibers are preferably in at least two, three, four, five, six, seven, eight, nine, ten, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 or more layers are arranged one above the other. They can essentially run parallel or in different directions, although in the latter case they are usually interwoven into fabrics. It has been recognized as essential that the at least two layers of the fiber composite remain fully bonded and do not delaminate during intended use.The expert understands "delamination" to mean the partial or complete separation of the layers of the fiber composite material from one another.

[0016] The term "intended use of the hollow-wall rim" refers to the use of the hollow-wall rim equipped with a tire when installed on the vehicle. This includes, in particular, driving and / or standing the vehicle on any type of surface, in particular on flat, uneven, straight, uneven, paved, and / or unpaved surfaces. During intended use, the hollow-wall rim may be exposed to external influences and / or impacts. Within the scope of the invention, it has been recognized that, due to its structural design, the hollow-wall rim according to the invention is resistant to external influences and / or impacts when used as intended.

[0017] The term "impact" refers to an impact on the hollow section rim during its intended use, particularly impacts caused by a jump, such as a sports jump, an obstacle, or rolling over uneven surfaces in the roadway, such as stones, rocks, roots, and / or other vegetation, or road construction-related edges and / or bumps. This can occur, in particular, when driving on a flat, uneven, paved, unpaved, fully or partially developed and / or asphalted road or path, and / or off-road.

[0018] The term "external influence" refers to a force acting on the hollow section rim due to intended use and / or improper use, for example, when not installed in the vehicle. This includes, but is not limited to, a fall, an accident, a collision, especially with one or more other vehicles, vandalism, an impact, improper maintenance, and / or improper repair.

[0019] By means of the invention, it is possible to provide a hollow-wall rim which, during intended use and / or non-intended use, is protected from damage to the rim and / or the mounted tire, in particular damage caused by delamination. In addition to the hollow-wall rim, the tire is also protected from damage caused by the hollow-wall rim itself due to the special curved design of the radially outer tire engagement sections. At the same time, the hollow-wall rim is particularly easy to handle and transport due to its hollow construction and the use of fiber composite materials, which offer a particularly favorable stability-to-weight ratio. Furthermore, the one-piece design of the hollow-wall rim eliminates at least one production step in the manufacture of the hollow-wall rim, resulting in considerable savings in production time and thus also in production costs.

[0020] Advantageous further developments of the invention, which can be implemented individually or in combination, are presented in the subclaims.

[0021] In one embodiment of the present invention, it is conceivable that the axial extent of the profile of the hollow chamber rim is greater than the radial extent of the profile of the hollow chamber rim. Within the scope of the invention, it has been recognized that a widened and simultaneously flat hollow chamber rim, compared to conventional rims, is advantageous for driving on flat, uneven, straight, odd-shaped paved and / or unpaved surfaces. The hollow chamber rim according to the invention, in addition to reducing weight, also offers the possibility of using a wider tire. The wider tire has greater grip on the ground, which is particularly, but not exclusively, necessary to prevent a fall. At the same time, the tire pressure in the tire can be reduced. As a result, the tire adapts its shape to the surface and is thus less slowed in its rolling motion. This adaptation also increases comfort for the driver.

[0022] In a further development of the design, it is conceivable that the axial extension of the profile of the hollow chamber rim has a value in the range from 10 mm to 400 mm and / or the radial extension of the profile of the hollow chamber rim has a value in the range from 5 mm to 80 mm. The axial extent of the profile of the hollow chamber is preferably at least 10 mm, even more preferably at least 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, 125 mm, 130 mm, 135 mm, 140 mm, 145 mm, 150 mm, 155 mm, 160 mm, 165 mm, 170 mm, 175 mm, 180 mm, 185 mm, 190 mm, 195 mm, 200 mm, 205 mm, 210mm, 215mm, 220mm, 225mm, 230mm, 235mm, 240mm, 245mm, 250mm, 255mm, 260mm, 265mm, 270mm, 275mm, 280mm, 285mm, 290mm, 295mm, 300mm, 305mm, 310mm, 315mm, 320mm, 325mm, 330mm, 335mm, 340mm, 345mm, 350mm, 355mm, 360mm, 365mm, 370mm, 375mm, 380mm, 385mm, 390mm, 395mm or 400 mm.The radial extent of the profile of the hollow chamber is preferably at least 5 mm, even more preferably at least 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm or 80mm.

[0023] Furthermore, it is conceivable that the ratio of the above-mentioned preferred radial dimension to the above-mentioned preferred axial dimension is in the range between 1:2 and 1:10. The ratio of the radial dimension to the axial dimension is preferably at least 1:2, even more preferably at least 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, or 1:10. These dimensions offer an optimal compromise between stability, weight, grip, and ride comfort.

[0024] According to the invention, the curvature of the first outer wall and / or the curvature of the second outer wall has a curvature in the range of 0.05 mm -1< to 1.0 mm -1<. The corresponding radius of curvature is in the range of 1 mm to 20 mm. The curvature is preferably at least 0.05 mm -1< , even more preferably at least 0.06 mm -1< , 0.07 mm -1< , 0.08 mm -1< , 0.09 mm -1< , 0.10 mm -1< , 0.11 mm -1< , 0.12 mm -1< , 0.13 mm -1< , 0.14 mm -1< , 0.15 mm -1< , 0.16 mm -1< , 0.17 mm -1< , 0.18 mm -1< , 0.19 mm -1< , 0.20 mm -1< , 0.21 mm -1< , 0.22 mm -1< , 0.23 mm -1< , 0.24 mm -1< , 0.25 mm -1< , 0.26 mm -1< , 0.27 mm -1< , 0.28 mm -1< , 0.29 mm -1< , 0.30 mm -1< , 0.31 mm -1< , 0.32 mm -1< , 0.33 mm -1< , 0.34 mm -1< , 0.35 mm -1< , 0.36 mm -1< , 0.37 mm -1< , 0.38 mm -1< , 0.39 mm -1< , 0.40 mm -1< , 0.41 mm -1< , 0.42 mm -1< , 0.43 mm -1< , 0.44 mm -1< , 0.45 mm -1< , 0.46 mm -1< , 0.47mm -1< , 0.48 mm -1< , 0.49 mm -1< , 0.50 mm -1< , 0.51 mm -1< , 0,52 mm -1< , 0.53 mm -1< , 0.54 mm -1< , 0.55 mm -1< , 0.56 mm -1< , 0.57 mm -1< , 0.58 mm -1< , 0.59 mm -1< , 0.60 mm -1< , 0.61 mm -1< , 0.62 mm -1< , 0.63 mm -1< , 0.64 mm -1< , 0.65 mm -1< , 0.66 mm -1< , 0.67 mm -1< , 0.68 mm -1< , 0.69 mm -1< , 0.70 mm -1< , 0.71 mm -1< , 0.72 mm -1< , 0.73 mm -1< , 0.74 mm -1< , 0.75 mm -1< , 0.76 mm -1< , 0.77 mm -1< , 0.78 mm -1< , 0.79 mm -1< , 0.80 mm -1< , 0.81 mm -1< , 0.82 mm -1< , 0.83 mm -1< , 0.84 mm -1< , 0.85 mm -1< , 0.86 mm -1< , 0.87 mm -1< , 0.88 mm -1< , 0.89 mm -1< , 0.90 mm -1< , 0.91 mm -1< , 0.92 mm -1< , 0.93 mm -1< , 0.94 mm -1< , 0.95mm -1< , 0.96 mm -1< , 0.97 mm -1< , 0.98 mm -1< , 0.99 mm -1< or 1.00 mm -1< . Within the scope of the invention, it is conceivable that the curvature of the first outer wall and the second outer wall is the same or different. When designing the curvature, care must be taken to ensure that it is sufficiently flat,to achieve the advantages listed above. At the same time, however, a curvature that is too flat means that additional material must be used.

[0025] In a further development, it is conceivable for the curvature of the first outer wall and the curvature of the second outer wall to continue beyond the outer walls and to continuously merge into a single curvature in the region of an inner rim arch. Due to this design, the hollow chamber rim has no edges, except for the area between the radially outer tire engagement sections, in particular not in the area of ​​the inner rim arch.

[0026] Edges are always a weak point in a fiber composite material, as forces acting there lead to delamination particularly quickly. The area of ​​the hollow rim between the radially outer tire engagement sections is additionally protected by the tire.

[0027] The term "continuous" means that both curves have essentially the same tangent at the point of their intersection. The terms "essentially" and "substantially the same" mean that there is only a slight, particularly insignificant, change, alteration, and / or deviation from the corresponding conditions.

[0028] In addition, it is conceivable that the width of the first radially outer tire engagement portion and / or the second radially outer tire engagement portion is preferably 2 mm to 60 mm. The width of the first radially outer tire engagement portion and / or the second radially outer tire engagement portion is preferably at least 2 mm, more preferably at least 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 51 mm, 52 mm, 53 mm, 54 mm, 55 mm, 56 mm, 57 mm, 58 mm, 59 mm and / or 60 mm. Within the scope of the invention, it is conceivable that the width of the first radially outer tire engagement portion and the second radially outer tire engagement portion are the same or different.

[0029] It is further conceivable for the first and second radially outer tire engagement sections to be configured identically. An identical configuration provides optimal central positioning of the tire between the radially outer tire engagement sections. This significantly simplifies balancing, particularly of two-wheeled vehicles.

[0030] It is also conceivable for the first radially outer tire engagement section and the first tire holding section and / or the second radially outer tire engagement section and the second tire holding section to form a flat contact surface for the tire. Due to the technically induced reduced manufacturing tolerances in tire production, it has been shown that the hooks on the tire holding sections, which previously provided sufficient hold for the tire even when the diameter deviated from the specified diameter, are no longer required. This is particularly true when the tire is used with a comparatively low tire pressure. Since these hooks represent an edge, and edges are a surface for delamination and are more complex to manufacture, it is advantageous to dispense with them and to make the tire holding section flat.

[0031] In an advantageous development, it is conceivable for the fiber composite material to comprise glass fibers, aramid fibers, boron fibers, basalt fibers, quartz fibers, carbon fibers, and / or a mixture thereof, and a matrix. The fiber composite material is preferably a carbon fiber composite (carbon) with carbon fibers. Carbon fiber composites are among the most stable fiber composite materials. Their use in lightweight vehicle construction is well-known and easily manageable. At the same time, this material incurs high material costs, which is why maintaining the hollow chamber rim is particularly advantageous. The material used for the matrix is ​​also fundamentally arbitrary.Thermosets such as unsaturated polyester resin (UP), vinyl ester resin (VE), phenol-formaldehyde resin (PF), diallyl phthalate resin (DAP), methacrylate resin (MMA), polyurethane (PUR), or amino resins, or thermoplastics such as polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polysulfone (PSU), polyetherimide (PEI), or polytetrafluoroethylene (PTFE), are preferred. Epoxy resin (EP) is particularly preferred. Those skilled in the art will know which fibers can be combined with which matrix materials.

[0032] Furthermore, it is conceivable for the fiber composite material to have a first outermost layer and a second outermost layer, wherein an arc section of the hollow chamber rim is completely enclosed by the first outermost layer of the fiber composite material and the second outermost layer of the fiber composite material, and wherein the first outermost layer of the fiber composite material and the second outermost layer of the fiber composite material are delimited by lines running radially along the region of the inner rim arc and a drop center of the hollow chamber rim. The design of the individual layers is fundamentally arbitrary.

[0033] The hollow chamber rim can be divided into 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more arcuate sections, with the division into exactly one arcuate section corresponding to the entire hollow chamber rim. The individual arcuate sections can have different sizes, but division into arcuate sections of equal size is preferred.

[0034] The first and second outermost layers of the fiber composite material can touch each other along the boundary lines and partially or completely overlap. Furthermore, the layers can touch the layers of the next sheet section at the edge areas and partially or completely overlap along the boundary.

[0035] Just like edges, the edges of fiber composite layers represent a weak point. Radial forces acting there lead to delamination particularly quickly. Therefore, it is advantageous to end layers of fiber composite material at those points where radial forces are least likely to occur. One such point is the inner rim arch, as this does not come into contact with the ground during intended use. Another point is the drop center located between the radially outer tire engagement sections, as this is additionally protected from force by the tire and its recessed position. A "drop center" is a depression between the radially outer tire engagement sections, which is particularly necessary for mounting and demounting the tire.

[0036] In a further development, it is conceivable for the fiber composite material to have four or five layers. Four or five layers achieve sufficient stability while keeping the overall weight of the hollow chamber rim as low as possible.

[0037] Furthermore, it is conceivable for the hollow chamber rim to be reinforced in the region of the inner rim arch, the first radially outer tire engagement section, and / or the second radially outer tire engagement section, in particular by locally limited layers of the fiber composite material. Within the scope of the invention, it has been recognized that certain sections of the hollow chamber rim are subject to greater stress than others. This particularly applies to the radially outer tire engagement sections. External influences and / or impacts, which are caused in particular, but not exclusively, by uneven and / or unpaved surfaces, mainly impact these areas. Another section subject to particular stress is the inner rim arch, as it bears the weight of the driver and the vehicle, as well as any additional weight in the vehicle.In addition, the inner rim arch must also absorb additional energy, which can arise, for example, from the vehicle hitting the ground. To provide these particularly stressed sections with sufficient stability, it is advantageous to reinforce them with locally confined layers of fiber composite material. The position of the additional locally confined layers of fiber composite material within the layer system is arbitrary. In particular, they can form the outermost, the innermost, or an intermediate layer. Furthermore, several locally confined layers of fiber composite material can be arranged in the layer system to reinforce the same stressed area. These can be embedded in the layer system at the same or different positions.In addition, one or more locally limited layers of the fiber composite material can extend beyond a particularly stressed area into one or more other particularly stressed areas and thus reinforce two or more particularly stressed areas.

[0038] Another advantageous development is that a pressure distribution element is arranged between the layers of the fiber composite material. This pressure distribution element is made of an elastically deformable material. The elasticity of the elastically deformable material is greater than the elasticity of the fiber composite material. If an external influence and / or impact occurs on the fiber composite material, a portion of its energy is absorbed by the elastically deformable material. Furthermore, the portion of the force that is transmitted to the underlying layers of the fiber composite material is distributed over a large area. These advantages can be utilized in particular when the pressure distribution element is arranged in the particularly stressed first and / or second radially outer tire engagement section or when the pressure distribution element encloses the entire hollow chamber rim.

[0039] The elastically deformable material used for production is fundamentally optional. It should preferably be an elastomer, especially one containing a rubber component. Different types of rubber, namely ethylene propylene diene rubber (EPDM), ethylene acrylate rubber (EAM), fluororubber (FKM), acrylate rubber (ACM), acrylonitrile butadiene rubber (NBR), hydrogenated acrylonitrile butadiene rubber (HNBR), carboxylated nitrile butadiene rubber (XNBR), natural rubber (NR), chlorosulfonated ethylene rubber (CSM), silicone rubber (VMQ / MVQ), and / or fluorosilicone rubber (MFQ), may also be included. The above-mentioned advantages can be optimally utilized when the elastically deformable material is chemically structured in such a way that it forms a material-to-material bond with the matrix material of the fiber composite material.

[0040] It is also conceivable that the vehicle is a two-wheeler, in particular a bicycle, motorcycle, moped, scooter, kick scooter, pedelec, or balance bike; a tricycle, in particular a trike, recumbent bicycle, or velomobile; a unicycle, a cargo bike, a wheelchair, a trailer, a sidecar, a wheelbarrow, a handcart, or a cart, in particular a marathon cart. In principle, the vehicle on which the hollow-wall rim is installed is arbitrary.

[0041] In another advantageous development, the hollow-wall rim is fitted with a tubeless tire. Tubeless tires are characterized by their lower weight and lower tire pressure. Furthermore, they eliminate the friction caused by the movement of the tire relative to the tube. To use the hollow-wall rim with a tubeless tire, it must be specially prepared, as otherwise air will escape through the nipple holes, for example. Suitable measures are known to those skilled in the art.

[0042] It is assumed that the definitions and descriptions of the above terms apply to all aspects described in this description and below, unless otherwise stated.

[0043] Further details, features, and advantages of the invention will become apparent from the following description of the preferred embodiments in conjunction with the subclaims. The respective features can be implemented individually or in combination with one another. The invention is not limited to the embodiments. The embodiments are illustrated schematically in the figures. The same reference numerals in the individual figures denote identical or functionally identical elements, or elements that correspond to one another in terms of their function.

[0044] In detail: Fig. 1 an isometric representation of an embodiment of the hollow chamber rim according to the invention; Fig. 2 an isometric representation of a cross-section of the hollow chamber rim according to the invention along an axial plane; Fig. 3 a partial excerpt ( Fig. 3A and 3B) a sectional view of the profile of the hollow chamber rim according to the invention and Fig. 4 a partial excerpt ( Fig. 4A and 4B ) a sectional view of the profile of the hollow chamber rim according to the invention including a pressure distribution element.

[0045] Figure 1 shows an isometric representation of the hollow chamber rim 01 according to the invention. The hollow chamber rim 01 comprises an outer rim arch 07, an inner rim arch 11, a first radially outer tire engagement section 10 and a second radially outer tire engagement section 12, which enclose a hollow chamber not shown. The illustrated embodiment of the hollow chamber rim 01 is divided into four equally sized arc sections 15. For the sake of clarity, only one of the arc sections 15 has been marked and named as an example. Figure 1It is clearly visible that the axial extension of the profile of the hollow chamber rim is greater than the radial extension of the profile of the hollow chamber rim, so that the hollow chamber rim 01 has a flat design.

[0046] Furthermore, it is in Figure 1 It is clearly visible that a tire (not shown) can be mounted on the outer rim arch 07. In the area of ​​the outer rim arch 07 and the inner rim arch 11, nipple holes 13 are arranged at regular intervals; these serve to accommodate spokes (not shown). In order to use the hollow chamber rim 01 with a tubeless tire (not shown), the nipple holes 13 are sealed in the direction of the outer rim arch 07. A valve hole 14 is arranged at one point between the nipple holes 13. This hole serves to guide the valve of the tire (not shown) to the inside of the hollow chamber rim 01.

[0047] Figure 2shows an axial cross section through the hollow chamber rim 01 according to the invention. The cross section reveals the hollow chamber 02 enclosed by the inner rim arch 11 and the outer rim arch 07. Furthermore, the curvature of the first radially outer tire engagement section 10 and the second radially outer tire engagement section 12 can be clearly seen. The sectional view of the profile of the hollow chamber rim resulting from the cross section is shown in further exemplary embodiments in Figures 3A and 3B and Figures 4A and 4B shown in detail.

[0048] Figures 3A and 3BEach shows a sectional view of the profile of the hollow chamber rim 01 according to the invention. This comprises the hollow chamber 02 and a frame 03, which comprises the outer rim arch 07, the inner rim arch 11, the first radially outer tire engagement section 10, and the second radially outer tire engagement section 12, respectively. In the embodiment shown, the frame 03 consists of four layers 04 of the fiber composite material and an outermost layer 05 of the fiber composite material. The layers 04, 05 of the fiber composite material are continuously circumferential.

[0049] Furthermore, it is the Figures 3A and 3B It can be seen that the inner rim arch 11 has a first shoulder 081 and a second shoulder 082. The first shoulder 081 and the second shoulder 082 are spaced apart by a deep base 09. As the Figure 3AAs can be seen, the first radially outer tire engagement portion 10 comprises a first tire holding portion 101 and a first outer wall 102. The first outer wall 102 has a curvature in the direction of the Figure 3B shown second radially outer tire engagement portion 12. The curvature continues beyond the first outer wall 102 into the inner rim arch 11. The Figure 3B illustrated second radially outer tire engagement portion 12, analogous to the first radially outer tire engagement portion 10 of Figure 3A , also a second tire holding section 121 and a second outer wall 122. The second outer wall 122 has a curvature in the direction of the Figure 3Aillustrated first radially outer tire engagement portion 10. The curvature continues beyond the second outer wall 122 into the inner rim arch 11. In a preferred embodiment, the first and second radially outer tire engagement portions 10, 12 are designed symmetrically, which means that the second outer wall 122 has a curvature that is mirror-symmetrical to the curvature of the first wall 102.

[0050] Figures 4A and 4Beach show a sectional view of the profile of a further embodiment of the hollow chamber rim 01 according to the invention, each comprising a pressure distribution element 106, 126. The hollow chamber rim 01 has a hollow chamber 02 and a frame 03. The frame 03 comprises several layers 04 of the fiber composite material, a first outermost layer 05a and a second outermost layer 05b of the fiber composite material. The frame 03 comprises an outer rim arch 07, a first radially outer tire engagement section 10 or a second radially outer tire engagement section 12, and an inner rim arch 11. The line at which the first outermost layer 05a of the fiber composite material and the second layer 05b of the fiber composite material meet lies in the region of the corresponding radially outer tire engagement sections 10, 12 in this embodiment.The first outermost layer 05a of the fiber composite material represents a local reinforcement of a particularly stressed area of ​​the inner rim arch 11. The second outermost layer 05b of the fiber composite material is continuous. In an alternative embodiment (not shown), the first outermost layer 05a of the fiber composite material and the second outermost layer 05b of the fiber composite material do not overlap or only partially overlap.

[0051] The outer rim arch 07 in Figure 4A also has a first shoulder 081 and a deep base 09, whereas the outer rim arch 07 in Figure 4B a second shoulder 082 and the deep base 09. The first shoulder 081 and the second shoulder 082 are spaced apart from each other by the deep base 09. The first radially outer tire engagement section 10 in Figure 4Acomprises a first tire holding portion 101 and a first outer wall 102. The second radially outer tire engagement portion 12 in Figure 4B comprises a second tire holding section 121 and a second outer wall 122. The first pressure distribution element 106 in Figure 4A and the second pressure distribution element 126 in Figure 4B In this embodiment, they are formed in the region of the first and second radially outer tire engagement sections 10, 12, respectively.

Claims

1. A hollow rim (01) for a vehicle, the hollow rim (01) comprising a first radially outer tire-engagement section (10), which has a first tire-holding section (101) having a first outer wall (102), and a second radially outer tire-engagement section (12), which is spaced apart from the first radially outer tire-engagement section (10) and has a second tire-holding section (121) having a second outer wall (122), and the hollow rim (01) being made of a fiber composite having at least two layers (04, 05), the hollow rim (01) being made in one piece with the first radially outer tire-engagement section (10) and the second radially outer tire-engagement section (12) and the first outer wall (102) having a curvature in the direction of the first tire-holding section (101) and the second outer wall (122) having a curvature in the direction of the second tire-holding section (121), characterized in that the curvature of the first outer wall (102) extends across the length of the first outer wall (102) and in that the curvature of the first outer wall (102) has a curvature degree ranging from 0.05 mm-1 to 1.0 mm-1 and / or in that the curvature of the second outer wall (122) extends across the length of the second outer wall (102) and in that the curvature of the second outer wall (102) has a curvature degree ranging from 0.05 mm-1 to 1.0 mm-1.

2. The hollow rim (01) according to claim 1, characterized in that the axial extension of the profile of the hollow rim (01) is larger than the radial extension of the profile of the hollow rim (01).

3. The hollow rim (01) according to claim 2, characterized in that the axial extension of the profile of the hollow rim (01) has a value ranging from 10 mm to 400 mm and / or the radial extension of the profile of the hollow rim (01) has a value ranging from 5 mm to 80 mm.

4. The hollow rim (01) according to any one of the claims 1 to 3, characterized in that the curvature of the first outer wall (102) and the curvature of the second outer wall (122) are continued beyond the outer walls (102, 122) and are continuously united in the area of an inner rim arc (11) to form a curvature.

5. The hollow rim (01) according to any one of the claims 1 to 4, characterized in that the width of the first radially outer tire-engagement section (10) and / or the second radially outer tire-engagement section (12) is preferably 2 mm to 60 mm.

6. The hollow rim (01) according to any one of the claims 1 to 5, characterized in that the first radially outer tire-engagement section (10) and the first tire-holding section (101) and / or the second radially outer tire-engagement section (12) and the second tire-holding section (121) form a plane abutment for a tire.

7. The hollow rim (01) according to any one of the claims 1 to 6, characterized in that the fiber composite comprises glass fibers, aramid fibers, boron fibers, basalt fibers, quartz fibers, carbon fibers and / or a mixture thereof and a matrix.

8. The hollow rim (01) according to any one of the claims 1 to 7, characterized in that the fiber composite has a first outermost layer (05a) and a second outermost layer (05b), an arc section (15) of the hollow rim (01) being entirely enclosed by the first outermost layer (05a) of the fiber composite and the second outermost layer (05b) of the fiber composite and the first outermost layer (05a) of the fiber composite and the second outermost layer (05b) of the fiber composite being limited by lines extending along the area of the inner rim arc (11) and a well (09) of the hollow rim (01).

9. The hollow rim (01) according to any one of the claims 1 to 8, characterized in that the fiber composite has four or five layers (04, 05).

10. The hollow rim (01) according to any one of the claims 1 to 9, characterized in that the hollow rim (01) is reinforced by locally limited layers (04, 05) of the fiber composite in the area of the inner rim arc (11), the first radially outer tire-engagement section (10) and / or the second radially outer tire-engagement section (12).

11. The hollow rim (01) according to any one of the claims 1 to 10, characterized in that a pressure distributor (106, 126) is disposed between the layers (04, 05) of the fiber composite.

12. The hollow rim (01) according to claim 11, characterized in that the pressure distributor (106, 126) is disposed in the area of the first radially outer tire-engagement section (10) and / or the second radially outer tire-engagement section (12) or in that the pressure distributor (106, 126) encloses the entire hollow rim (01).

13. The hollow rim (01) according to any one of the claims 1 to 12, characterized in that the vehicle is a two-wheeler, in particular a bicycle, a motorcycle, a moped, a scooter, a kick scooter, a pedelec or a balance bike, a tricycle, in particular a trike, a recumbent bicycle or velomobile, a unicycle, a cargo bike, a wheelchair, a trailer, a sidecar, a wheelbarrow, a handcart or a cart, in particular a marathon carriage.

14. The hollow rim (01) according to any one of the claims 1 to 13, characterized in that a tubeless tire is mountable on the hollow rim (01).