WO2015158780A1

WO2015158780A1 - Vehicle wheel made of fibre-reinforced plastic

Info

Publication number: WO2015158780A1
Application number: PCT/EP2015/058180
Authority: WO
Inventors: Niccolò Pini; Sebastian Beck; Johannes REISSER
Original assignee: Kringlan Composites Ag
Priority date: 2014-04-15
Filing date: 2015-04-15
Publication date: 2015-10-22
Also published as: CH709492A2

Abstract

A vehicle wheel made of fibre-reinforced plastic with a wheel spider taking on the function of spokes and with a hub region which is centred with respect to the axis of rotation of the wheel and has fastening means for attaching the wheel to a vehicle wheel hub. Following consecutively in the radial direction, adjoining the hub region, are a spoke region and an outer circumferential region U for connection to a connecting region V of the rim. The circumferential region U is formed here at least at the ends of the spokes of the wheel spider, but can also be designed as a continuously encircling circumferential region in the case of a wheel spider which has, for example, an annular outer structure connected to or continuous with the ends of the spokes. The wheel spider here comprises an inner and an outer wheel spider sheet which is in each case composed of fibre-reinforced plastic, for example of a multi-layered basic laminate composed of a semi-finished fibre-reinforced polymer product. According to the invention, by means of frictional connection of the inner and outer wheel spider sheet, at least one cavity is formed for stiffening the hollow body of the wheel spider in the region of the wheel hub and/or at least in a partial region of the spokes.

Description

Vehicle wheel made of fiber-reinforced plastic

The present invention relates to a vehicle wheel made of fiber-reinforced plastic according to the preamble of claim 1.

Vehicle wheels are made of fiber-reinforced plastic

basically known from the prior art. Thus, WO 2013/083443 AI describes a corresponding wheel, in which a hub member and wheel disc or rim star and the rim itself are each made separately. Subsequently, the items are connected in various manufacturing steps to a vehicle.

A disadvantage is that for the production of the individual components and their subsequent connection a variety of steps is necessary. Furthermore, the design of the strength of the Radsterscheibe and thus the entire wheel is limited.

Another wheel design discloses WO 2014/016211 AI. This is a preformed core between two

also preformed Radsterscheiben sandwiched, so that a load-bearing construction is formed, which is then connected at least via the Radsternscheiben with the rim. In this case, the plastic core produced by injection molding or compression molding together with the two Radsternscheiben and the rim must ensure the ^'required strength or stiffening of the wheel.

Accordingly, to achieve operational safety the wheel special precautions such as the choice of a correspondingly dense core material or, in execution of the core as a hollow body, a corresponding solid truss ^¬ or honeycomb structure necessary, whereby the weight of the wheel is increased.

It is therefore an object of the present invention to provide a

To propose a vehicle wheel that avoids the disadvantages of the prior art. In particular, it is an object of the invention to provide a vehicle wheel of fiber reinforced

To show plastic material, which is easier to produce in a few steps. Another task of

The invention is to propose a wheel with a lower weight compared with wheels of the prior art with the same or even increased stability and / or rigidity of the wheel.

According to the invention, a vehicle wheel according to independent claim 1 is accordingly proposed. Further

Designs and modifications will become apparent from the dependent claims 2 to 27.

An inventive vehicle wheel made of fiber-reinforced plastic has the function of spokes

receiving hub on and has a centric to the wheel axis hub region with fastening means, such as through holes with or without

Support sleeve for attaching the wheel to a vehicle wheel hub. In the radial direction, subsequent to the hub region, a spoke region and an outer peripheral region U follow Connect to a connection area V of the rim. The peripheral region U is at least at the ends of the

Spokes of the wheel formed, but can also in a Radstern, for example, has a ring-like connected to the ends of the spokes or contiguous outer structure, as a continuous circumferential

Be formed circumference area.

The wheel star comprises an inner and an outer,

Radsternblatt, each of fiber-reinforced plastic, for example, a multi-layer base laminate of fiber-reinforced polymer semi-finished consists. In accordance with the invention, at least one cavity is provided by non-positive connection of the inner and outer wheel star blades

Hollow body stiffening of the wheel hub in the region of the wheel hub and / or formed at least in a portion of the spokes. The connection of the inner and the outer

Radsternblatt is preferably material fit.

Material closure can be produced by gluing, welding, by pressing, but preferably by heating element welding or IR welding, in particular preferably by hot pressing, whereby compounds with particularly high strength are achieved. The connection can be made linearly along the edges of the Radsternblätter or preferably flat in the edge region or flat in any other area of the Radsternblätter. When Heizelement- or synonymous contact welding method, the surfaces to be joined by

direct contact with a heating element brought to the required working temperature and, after removing the

Heating element, connected or pressed together. Analogous For this purpose, the surfaces are brought to the required working temperature by means of radiant heaters during the IR welding process. Further details of the preferred hot-pressing process follow below.

To form the reinforcing hollow spoke structure, at least one of the wheel-star blades and preferably also the prepregs used therefor are shaped or preformed three-dimensionally, at least in the region of the wheel hub and / or in partial regions of the spokes. For receiving the pressing pressure, at least in larger diameters of the cavity, at least in a region of a cavity, a core of fiber composite material may be arranged. Since in this case the core is intended to prevent collapse of the cavity in the mold, for example only during the hot-pressing process, but does not have to absorb any forces during use of the wheel, this can be carried out in lightweight construction. Thus, the core essentially consists essentially of a fiber composite material with a short fiber length, up to a maximum of 12 mm, for example for reasons of weight, at least partially made of polymer foam or fiber-reinforced polymer foam, which preferably contains fibers with a short fiber length. This is also

manufacturing technology of advantage, since the resulting, for example, in the production of the wheel stars or the rim

Waste material can be poured as granules after crushing or sprayed as a foam. Furthermore, a support element, either in place of the core, may be provided in the cavity together with the core or covered by the core. In principle, however, the core can consist of completely different materials, for example from one or more of the following materials: polymeric material, glass, ceramic, graphite, metal being based on the weight savings preferably at least partly a foam such as polymer foam, glass foam, ceramic foam, graphite ^¬ foam or metal foam is used. In a further embodiment, the core may contain a hollow body or be designed as a hollow body itself. Thus, the core can contain, for example, as a hollow body, a tube or an at least partially tubular hollow body, which consists of fiber composite material or of a light metal such as aluminum or titanium. If such a tubular metal body is used, this may advantageously be first encased with fiber composite material, for example glass fiber composite material, or embedded in fiber composite material. This allows a better connection of the tube during the hot pressing of the core or the entire wheel center. In a further ^embodiment , the core can consist of two connected half-shells, in which case the support element in the half-shells can be in the form of a honeycomb, for example as a web or latticework.

Fastening means for attaching the wheel to the Fahrzeugradnabe, further fastening means for additional connection of the wheel to the rim if necessary, a Radsternblatts with the core or for other types of connections can in principle directly, for example in the form of Thread or be introduced as a through hole in the plastic wheel. Advantageously, in particular ^¬ sondere can therefor but at to be expected occurrence of high forces, metal inserts, such as support cylinder for receiving the pressure of the wheel nuts in the area of the lug bolt receiving through-holes, threaded inserts as used for example helicoils, in known manner, or threaded holes in one or more of the above-mentioned metal inserts or metal pipe

be provided.

In a preferred embodiment of the present invention

Invention, the cavity extends at least in

Spoke area essentially from an inner to an outer spoke area. To build a particularly torsionally stiff vehicle wheel, the entire wheel center may be formed as a hollow body.

While in conventional vehicle wheels, as described for example in WO 2014/016211 AI, the Radstern consists of at least three prefabricated parts in each case, which are composed in the manner of a sandwich structure (2 Radsternblätter and core), the Radstern the present wheel advantageous, for example be manufactured in a single hot pressing step, which can be dispensed with two expensive hot-pressed molds. For this purpose, in a first step, fiber-reinforced polymer semifinished product, for example, three-dimensionally preformed blanks of fiber-reinforced plastic mats (so-called prepregs), are laid in several layers in a mold half. wise connected by spot welding and thus formed a first multiple layer. Subsequently, if necessary, various fastening means (threaded inserts, etc.), support sleeves for the wheel hub attachment or the like can be placed or fastened at the designated location.

In a further step, if necessary, at the designated locations, for example in areas which have a particularly large cavity diameter and therefore can collapse during hot pressing, or in

Areas which are exposed in use high pressure loads, proppant and / or one or more cores

be introduced. The core can be poured or injected as granules or, if prefabricated, inserted. In this case, previously placed fastening means and / or support means can be fixed in place, for example by means of injected polymer foam.

If metallic support bodies are used, they can be previously wrapped, for example, with ribbons of fiber-reinforced plastic or encapsulated with fiber foam for better connection in the plastic composite.

In a preparatory step for hot pressing final step, fiber-reinforced polymer semi-finished is then placed in other layers and forms a second multiple layer, the preformed either flat with overhead edges or surfaces of the polymer semi-finished bottom layers or even three-dimensionally preformed with the first layer together Preform of the hollow body forms. Also in the area of the second multiple layer can appropriate fastening, support means or the like may be provided.

Subsequently, the wheel center in a single operation, for example when using PEI, at temperatures between 300 ° C to 390 ° C, especially at about 350 ° C, hot pressed. A prefabricated rim can then be connected to the wheel center, for example by gluing, by welding, in particular by contact or IR welding, or by a combination of said connection methods with additional mechanical fastening measures, as described in another context. Thus, the production of the present wheel with a

much lower tooling costs than in the prior art, such as. In WO2014 / 016211 described possible.

Even more cost-effective, such a wheel can only mechanically, for example, by a form turning closure, such as a Baj onettverschluss or the like, with the rim

get connected. This can, for example, by

Bonding and / or secured by a mechanical safeguard against accidental loosening, which

For example, a further welding process can be saved.

Due to the use of the hollow spoke principle and the manufacture of the wheel center in one step, a wheel according to the invention can be made significantly lighter than wheels of the prior art. For example, a prior art fiber-reinforced plastic wheel without tires weighs about 8 kg while a wheel according to the invention the same dimension weighs only about 6.5 kg. Thus, weight savings between 15 to 30% can be achieved.

Of course, if necessary, individual or even all components of the wheel star can be prefabricated, which, however, requires additional molding, joining and / or hot stamping operation.

In a further embodiment of the vehicle wheel, the cavity for hollow body reinforcement is formed at least in a radial section of the spokes substantially transversely or obliquely to the longitudinal axis of the spoke. Because in this case not the whole spoke as a hollow spoke

is executed, the wheel center, at least in the region of the transverse or oblique to the longitudinal axis of the spoke formed cavity, by another, in a radial

Partial area designed as a spoke, Radsternblatt

to be supported. In this case, at least the part of the cavity projecting furthest from the wheel center can be arranged in a depression or between at least two knobs or ribs of the cavity

be supported further Radsternblatt. Advantageously, the wheel with the other Radsternblatt is also fastened materially and / or with a further mechanical connection, such as a screw, rivet, or the like.

Independently of the embodiments, the wheel center in the peripheral region U is connected to a connection region V of a rim which is advantageously also prefabricated from fiber composite material. In this case, the rim can at least in a peripheral portion of a cavity have for hollow body stiffening. Furthermore, in the area of the circumferential area U and of the connecting area V, the wheel center and rim flange can be at least partially enclosed by a ring-shaped hoop. In this case, the Fassreif can be made in one piece or segmented. The

Fiber composite material of the vehicle wheel can basically consist of any fiber-reinforced plastic. However, preference is given to glass-fiber reinforced but especially for reasons of weight carbon fiber reinforced plastic. When

Fiber material can be used only by way of example for the large number of possibilities a fiber of the type 12k (for example T700 from Toray, C30 50k from SGL, HTS from Toho-Tenax, AS4 from Hexcel). When

Matrix polymers are preferred here, in contrast to conventional thermosetting prepregs

Thermoplastics, in particular thermoplastic

High performance plastics, used, which, in addition to a high continuous temperature resistance, good impact strength and excellent creep resistance in the solid state, maintain the rigidity over a wide temperature range and have a particularly high resistance to thermal oxidative degradation. Some amorphous or crystalline thermoplastic matrix polymers suitable for the present application are polyetherimide (PEI), polyethersulfone (PES, PESU), polysulfone (PSU), polyphenylsulfone (PPSU), polyphenylene sulfide (PPS) and others.

The production of a rim made of fiber-reinforced plastic is already known from WO 2013/037428. Such a rim can in principle also with a wheel according to the invention be connected with hollow spoke structures. In principle, however, rims made entirely differently can be used, with rims made of composite material being particularly suitable for reasons of weight. Particularly preferred is the use of a rim as disclosed in the co-pending CH ... (P213269). The content of this application is therefore fully explained as an integral part of the present application. A corresponding rim consists of several layers of fiber-reinforced polymer, at least in

Some areas of the rim between a multilayer inner base laminate and a multilayer outer base laminate are arranged a plurality of extending in the circumferential direction of the rim band stacks, which can be generated for example by winding the bands in the circumferential direction.

It can, in each case per section in the contour of the rim surface, be arranged circumferentially extending band layers. The individual tape layers may have bandwidths which correspond approximately to the thickness of the respective rim portion or

have at least one or only such bands, which have a greater width, so that they at least in the edge region of the respective section through which

Pressing operation bent, wavy or swirled.

In addition, in the rim, as already mentioned, a further cavity may be provided. For this purpose, at least in a circumferential, ie extending in the circumferential direction, portion of the rim by non-positive Connection of the inner and outer multilayer Grund ^¬ laminate, at least one cavity for hollow body stiffening of the rim to be formed. This cavity can ^¬ example as immediately adjacent to the connecting region V to give the wheel after assembly of the wheel center with the spoke in the joining and circumferential area V, U a particularly high strength or stiffness. To accommodate the pressing forces in the mold, for example, a core as described above may be provided.

Furthermore, a heat sink or a heat reflection shield may be attached to the side of the wheel hub facing the vehicle wheel hub, in particular in the region of the wheel hub. The designed essentially as a metal disk heat sink or a heat reflection shield can take over several functions. Thus, on the one hand, the contact force of the vehicle wheel hub with respect to the hub region of the

Wheel according to the invention are distributed as evenly as possible on this and cooled to the other of the wheel, or the heat of the brake system are reflected, whereby an unacceptably high heat input from braking operations in the plastic material of the wheel can be avoided. To increase the cooling effect, the metal disc can be formed and dimensioned as known with cooling fins or the like. Incidentally, the metal disc may have a circular cylindrical ^¬ in relation to the wheel rotation axis section whose inner circumferential surface is provided for abutment on a centering collar of the vehicle wheel hub by annular configuration. Preferably, the heat sink, or sit the heat reflection shield on metallic support cylinders inserted in the through holes of the wheel bolts, whereby they are thermally and mechanically connected to the cooling or reflection disc.

Further preferred embodiments of the wheel according to the invention, of the wheel according to the invention as well as of the rim according to the invention are shown in the following

Examples, as characterized in the claims.

Details and embodiments will be explained with reference to the figures. Showing:

Figure 1 A wheel according to the invention in the supervision;

FIG. 2 A sectional view through the wheel from FIG. 1

along the axis ΑΑ ·

FIG. 3 shows the cross section of a spoke from FIG. 1

along the axis BB ^λ and others

Embodiments;

Figure 4 An embodiment of a core as a double

Half shell;

FIG. 5 shows a radial section through a wheel center

FeIgenverbünd ·

FIG. 6 shows a radial section through a connection of a

Radsterns with another Radsternblatt

The example shown in Figure 1 in supervision

Vehicle wheel 1 of a first embodiment has a shape

Radstern 2, the outer Radsternblatt, in contrast to the actual material embodiment, transparent is shown. Thus, the inner structure of the wheel is recognizable. The cavity 10 filling in this case the entire hub region 3 and spoke region 5 is partially filled with a core 11. The core 11 in turn beinhal- tet a honeycomb-shaped in this case spoke portion, annularly formed in the hub region supporting element 14. In the hub portion 3 are mounted through holes 20, which, for example, cylindrical preferably metallic support ^¬ elements contain 22 to a setting of the

Core material to prevent.

Figure 2 shows the section ΑΑ ^λ of Figure 1, in the area to the right of the wheel axis R, in the hub portion 3, the through hole 20 with metallic support sleeve 22 surrounded by an annular support member 14 ^Λ , which consists for example of fiber composite material. In the following

Spoke area 5, the hollow spoke 4 with the arranged in the cavity 10 and core 11 support elements 14. Thus, the stiffening effect of the hollow spoke construction is also used in this case for the construction and reinforcement of the hub portion 3. In the connection region V of the rim 6 with the

Peripheral region U of the Radsterns 2 are rim 6 and Radstern 2 preferably materially connected to each other. In the present example, a further cavity 10 is also in the connection region of the rim 6, if necessary

is also filled with a core 11 ^Λ , to recognize. Further details will be discussed in connection with FIG.

A schematxscher cross section along the section line B, B ^{A of} the vehicle wheel 1 shown in Figure 1 is in Figure 3-1 shown. The three-dimensionally executed inner Radsternblatt 8 in this area comprises the present in this representation of two half-shells 13, 13 core by the honeycomb-shaped support member 14 is arranged. The connection between the inner and outer Radsternblatt 9 is flat in the flange side areas.

Due to this structural design inner wheel star sheet 8 with core 11 and outer Radsternblatt 9 can be easily connected to one another materially in a single pressing operation. In addition, if necessary, for example in the flange-side area, through holes through both wheel stars for fasteners 7 such as screw / nut, or at least one through hole through a Radsternblatt and corresponding blind hole with thread or threaded insert in the second Radsternblatt be provided for further connection.

Basically, it should be noted that a thread here or for the other compounds mentioned also directly in the fiber-reinforced plastic, such as the carbon core or the Radsternblatt or the rim can be introduced. However, a metallic version has expected frequent installation or extremely high loads

Advantages, in view of the corrosive properties of carbon components, the contact with Aluminiumein ^¬ sets (cast aluminum components or the like) should be avoided for example by thin fiber-reinforced plastic inserts or the like. Alternatively, the use of stainless steel or titanium as a material for the purposes mentioned above is particularly suitable for particularly high-quality wheels. FIGS. 3-2 and 3-3 show two further embodiments of a hollow spoke of a wheel according to the invention. In Figure 3-2, a tube 12 is provided as a support element, which may for example be made of light metal such as aluminum or as a prefabricated fiber-reinforced plastic pipe. Such a design with metal tube 12, for example, simply after completion of the wheel 1, by attaching a threaded hole from the outside in

Metal tube for further attachment of one or both

Radsternblätter (8, 9) are used. One more

simpler structure shows Figure 3-3. Here is the core in one piece, running the cavity between the outer and inner Radsternblatt filling. Especially with small structural diameters of the cavity can be completely dispensed with a core, as this, as mentioned above does not contribute to the higher functional strength of the wheel, but only has a Stützf tion during the pressing process. The functional stiffening of the wheel hub is ensured by the structural design as a hollow spoke. Although in Figure 3-1 to 3-3 all connections between the outer and inner Radsternblatt are made flat, the connection with a corresponding structural design also linear, so for example in the area or along the joint of one or two edges done. The Radsternblätter can be either three-dimensionally shaped both flat and linear connection or as in the sectional images of the spokes, 3-1 to 3-3, shown with only a three-dimensional and a planar planar shaped Radsternblatt. In particular, Radsternblätter can also in Subareas, for example in the spoke area 5, at least ^¬ formed planar in a sectional plane and in contrast, in another sectional plane or in the edge regions be shaped three-dimensionally. FIG. 4 shows an example of a core consisting of two half-shells 13, 13. Such cores can be prefabricated individually for each spoke or over a correspondingly shaped hub region, connected together for the entire wheel center. In this case, for example, one or more support elements 14 are inserted in the lower prefabricated fiber-reinforced plastic shell 13, if necessary, and then the lower shell is connected to the upper shell 13, in this case by a tongue and groove fit. In addition, the connection can be secured by further fastening means or gluing, welding or hot pressing or a combination of these types of connection.

Figure 5 shows a detail of a radial longitudinal section of a hollow spoke 4 and their connection to a rim 6. The prefabricated components are here in the large area in

Peripheral region U of the spoke 4 and the connection region V of the rim 6 connected. For additional stabilization, the rim is in turn provided with a cavity 10 ^{Λ λ} , which is filled with a core 11 if necessary. In addition to the control performed by material bond, for example by welding or gluing connections a mechanical attachment desired, also here in the cavities 10, 10 ^λ or in core 11, 11 ^Λ arranged here not shown in detail supporting elements or Fasteners, such as threaded metal inserts, Helicoils or the like, are provided. Furthermore, in FIG. 5, the rim flange and the outer peripheral area of the wheel center are at least one

partially comprehensive Fassreif 19 shown. This

Fassreif, on the one hand causes a further stabilization of the connection between the wheel center 4 and rim 6, on the other hand, the stability of the wheel in radial impact

Increased (eg. When driving over a sidewalk edge), for example, made of metal, preferably a light metal, be performed either in one piece or segmented. When integrally running barrel ring 19 this can by

Thermofassung, for example, by preliminary heating and then cooling on the wheel, i. by

Shrinking, be applied, while in a segmented structure of the drum ring this also plugged, glued, hot-glued, pressed or welded and / or additionally with mechanical fasteners with

Radstern 2 and / or rim 6 can be connected. FIG. 6 shows a section of an alternative

Construction as truss ^wheel 1 ^Λ . The spoke 4 shown in longitudinal section here has a cavity 10 likewise formed by frictional connection between the inner and outer Radsternblatt 8, 9, but which is aligned transversely to the longitudinal direction of the spoke. In this case, the spoke 6 ^{Λ is} only in a radial

Partial area hollow body stiffened. An additional

Stiffening of the wheel is achieved in this case by another Radsternblatt 15, the material preferably with the Radstern 2, and the spoke 6 of the wheel star connected is. Alternatively or additionally, the compound can also be fixed by means of mechanical fastening means 7, such as here as a screw with in the cavity

Mating thread to be produced. Alternatively or

In addition, it can be beneficial for suppression or

Limitation of relative movements, nubs 16 on the

be mounted further Radsternblatt 15, which may also be in the form of ribs or the circumference of the cavity formed by the cavity 10 ^λ following ring, executed. A similar function can be achieved by a recess or recess of the other wheel star blade 15. The further Radsternblatt 15 can follow the outline of the Radsterns in geometry or, for example, to save weight, even narrower, or be made wider for design purposes in geometry. Although the spokes of the other Radsternblatt 15 can also be individually attached to the Radstern 2, it is off

Stability reasons advantageous to perform the other Radsternblatt 15 in one piece and in addition to the Radstern 2 in the hub region 3 and / or in the peripheral region U, to verbin ^¬ the. Such a truss-like trained Radstern 2 ^Λ with additional Radsternblatt 15 can be connected as well as the Radstern described in the first embodiment 2 in a welding process with the rim 6.

Although in the foregoing, in certain examples certain embodiments of an inventive vehicle wheel, or its components such as wheel with spoke (with and without core) Radsternblatt and rim have been described, it should be noted that all different combinations of different not in one Example of said components, if technically feasible, combinable and subject of the present invention. The same applies to the described production, for example. Connection method. For example, of course, with respect to the cavity formed in the rim if necessary, the structural features specified in the description of the cavity or the cavities in the spokes, for example, for receiving the pressing pressure, for example, different cores, or for additional fastening or reinforcement measures , For example, the (provision of

different fasteners, etc.) can be realized.

LIST OF REFERENCE NUMBERS

1 vehicle wheel

2 wheel stars

3 hub area 4 spokes

5 spoke area

6 rim

7, 7 'fastening means

8 inner wheel star blade 9 outer wheel star blade

10, 10 cavity 11, 11 'core

12 hollow body, tube

13, 13 'half shell

14 support element

15 additional wheel leaf 16 knob (rib)

18 Fit (tongue and groove) 19 Collar ring

20 through hole 22 support element

23 rim flange

Claims

claims

1. vehicle wheel (1) made of fiber-reinforced plastic with a function of spokes (4) taking over Radstern

(2), the center of a wheel axis of rotation R hub region

(3) with fastening means (7) for attaching the wheel to a vehicle wheel hub, a subsequent thereto

Spoke area (5) and a peripheral area U to

Connecting with a connecting portion V of the rim (6), wherein the wheel center (2) an inner and outer, each formed from fiber composite material Radsternblatt

(8, 9), characterized in that the wheel center (2) in the region of the wheel hub and / or at least in partial regions of the spokes (4), by non-positive connection of the inner and outer Radsternblatt (8, 9), at least one cavity ( 10) forms the hollow body stiffening of the wheel (2).

2. Vehicle wheel according to claim 1, characterized in that the connection of the inner and outer Radsternblatts (8, 9) is material fit.

3. Vehicle wheel according to one of the preceding claims, characterized in that the compound is a Klebever ^¬ bond, a welded joint, a press connection preferably a Heizelementschweissverbindung or IR-welded connection, particularly preferably one

Hot press connection is.

4. Vehicle wheel according to one of the preceding claims, characterized in that at least one of

Radsternblätter (8, 9) is three-dimensionally shaped.

5. Vehicle wheel according to one of the preceding claims, characterized in that in at least one region of at least one cavity (10), a core (11) is arranged.

6. Vehicle wheel according to one of the preceding claims, characterized in that the core consists essentially of one or more of the following materials:

Polymer material, glass, ceramic, graphite, metal preferably at least partially from a foam such as polymer foam, glass foam, ceramic foam, graphite foam or metal foam.

7. Vehicle wheel according to one of the preceding claims, characterized in that the core (11) consists essentially of one or more of the following materials: fiber composite material, in particular fiber composite material with short fiber length, polymer foam, in particular

Polymer foam containing fibers with short fiber length.

8. Vehicle wheel according to one of the preceding claims, characterized in that the cavity (10) contains at least one support element (14).

9. Vehicle wheel according to one of claims 5 to 8, characterized in that the core (11) contains a hollow body (12) or is a hollow body.

10. Vehicle wheel according to claim 9, characterized in that the hollow body is a tube (12) or at least partially tubular.

11. Vehicle wheel according to one of claims 5 to 9, characterized in that the core (11) consists of two connected half-shells (13, 13 ').

12. Vehicle wheel according to claim 11, characterized in ^¬ net, that the support element (14) in the half-shells (13, 13 ') is arranged.

13. Vehicle wheel according to one of claims 1 to 12, characterized in that in the Radsternblättern (8, 9), in the core (11) or at least one Radsternblatt (8, 9) and core (11) cross-metallic fasteners (7, 7 ') are provided.

14. Vehicle wheel according to one of claims 1 to 13, characterized in that the at least one cavity (10), at least in the spoke area (5), is formed extending substantially from an inner to an outer spoke area.

15. Vehicle wheel according to one of claims 1 to 14, characterized in that the entire wheel center (2) as

Hollow body (10) is formed.

16. Vehicle wheel according to one of claims 1 to 13, characterized in that a cavity (10 ') for Hohlkörperver- stiffening at least in a radial section

at least one spoke (4) is formed substantially transversely or obliquely to the longitudinal axis of the spoke (4).

17. Vehicle wheel according to claim 16, characterized in that the wheel center (2), at least in the region of the transverse or oblique to the longitudinal axis of the spoke (4) formed cavity (10 '), by another, in a radial

Partial area as a spoke (4 ') running, Radsternblatt (15) is supported.

18. Vehicle wheel according to claim 17, characterized in that at least part of a cavity formed by the cavity (10 ') bulge in a recess or between at least two knobs or ribs (16) of the other

Radsternblatt (15) is supported.

19. Vehicle wheel according to one of claims 17 or 18, characterized in that the further Radsternblatt (15) with the Radstern (2) is materially connected and / or mechanically connected.

20. Vehicle wheel according to one of claims 1 to 19, characterized in that the wheel center (2) in the peripheral region U with the connection region V of a prefabricated fiber composite material rim (6) is connected.

21. Vehicle wheel according to one of claims 1 to 20, characterized in that the rim of an inner and an outer multi-layer base laminate

fiber-reinforced polymer semifinished product, between which a plurality of circumferentially extending band stacks of fiber reinforced polymer material are arranged.

22. Vehicle wheel according to claim 21, characterized in that in each case per section in the contour of

Rim surface extending in the circumferential direction

Band layers are arranged, wherein the individual band layers Bandwidths which correspond approximately to the thickness of the respective rim portion or at least individual bands of the individual band layers have a greater width.

23. Vehicle wheel according to claim 21 or 22, characterized

characterized in that at least in a circumferential

Part of the rim by frictional connection of the inner and outer multi-layer base laminate, at least one cavity (10 ^λ ) for hollow body stiffening of the rim (2) is formed.

24. Vehicle wheel according to claim 23, characterized in that the cavity (10 ^{, λ} ) directly adjacent to the connection ^{¬ range} V.

25. Vehicle wheel according to one of claims 23 or 24, characterized in that the cavity (10) contains at least one core (11 ^Λ ).

26. Vehicle wheel according to claim 25, characterized in that the core (11 ^Λ ) contains a support element or a hollow body or is a hollow body.

27. Vehicle wheel according to one of claims 1 to 24, characterized in that in the region of the peripheral region U and the connecting region V, wheel star (2) and rim flange (23) by a tassel-like hoop (19) are included, wherein the tire in one piece or segmented.

28. Vehicle wheel according to one of claims 1 to 25, characterized in that the fiber-reinforced plastic or the fiber composite material consists of glass fiber reinforced and / or carbon fiber reinforced plastic.

29. Vehicle wheel according to one of claims 1 to 26, characterized in that on the vehicle wheel hub

facing side of the Radsterns a heat sink or a heat reflection shield is mounted