Patent Application
20220134802
The subject matter of the present disclosure is an insert element for a vehicle wheel, in particular a light metal wheel, with several supporting bodies arranged at an axial distance from one another on the rear side on the insert element for bracing the insert element installed on the vehicle wheel on supporting surfaces of the vehicle wheel, wherein the supporting bodies have a supporting shoulder which can be brought to bear against a supporting surface of the vehicle wheel and a fastening extension with an axial hollow channel and with at least one outwardly protruding locking projection, arranged at an axial distance from the supporting shoulder, for engaging behind an installation opening reaching through the supporting surface of the vehicle wheel. Furthermore, a vehicle wheel with at least one such insert element is described.
Light metal vehicle wheels are designed in many cases as spoked wheels. The spokes connect the hub mount bearing the wheel stud bores to the rim. Between the spokes, spoke openings are arranged. Such a spoke can also be formed from two or more spoke segments. Such light metal wheels exist in different designs. Here they are cast wheels or forged wheels.
Such vehicle wheels are produced and offered in different variants not only with regard to their wheel form but also with regard to their coloring. The coloring usually takes place by painting certain surfaces or surface regions of the wheel. According to another possibility for a colored design of such a wheel, a spoke insert made of plastic is inserted in the spoke openings as wheel appliqué. These spoke inserts can be of the same color as the light metal wheel or of another color. In this manner, without having to paint the vehicle wheel, this vehicle wheel can be provided multiple colors. Such spoke inserts can also be designed to completely or partially cover spoke openings, in order to reduce the flow resistance coefficient of the vehicle wheel by means of such wheel appliqués. It is precisely for this purpose that such spoke inserts are available, since, by means of them, with clearly reduced weight, the flow resistance coefficient can be reduced in comparison to a vehicle wheel in which the surfaces in question are formed by the light metal.
In vehicle wheels, plastic appliqué parts in the form of hub caps are also used. They are attached in the axial bore of the wheel by a snap connection. However, in contrast to the above-described spoke inserts, these plastic appliqué parts are not exposed to centrifugal forces. The centrifugal forces occurring when the vehicle wheel is rotated and acting on a spoke insert are not negligible. The spoke insert therefore must be fastened on the vehicle wheel in such a manner that there is no risk of the spoke insert loosening. For this purpose, such a spoke insert has multiple, for example, three, supporting bodies protruding on the rear side, arranged at a distance from one another. In each supporting body, a threaded bushing made of metal is inserted. The vehicle wheel has complementary supporting surfaces, on which the supporting bodies can be brought to bear during the installation of such a spoke insert. The supporting surfaces have a respective bore, in order to provide access to the threaded bushings located in the supporting bodies of such a spoke insert from the rear side of the wheel. Such a spoke insert is usually fastened by means of screws which are installed from the rear side of the wheel. Said screws pass through the installation opening, typically implemented as an installation bore and passing through the supporting surfaces, and they are secured by means of their threaded shaft in the threaded bushings of a respective supporting body. So that such a screw connection does not automatically loosen, in many cases, with the threaded bushings, titanium screws provided with screw securing media are commonly used. As a result of this pairing of materials, corrosion is prevented. In fact, in this way, such a spoke insert is permanently fastened securely on the vehicle wheel. However, the screws required for this purpose are expensive. If each spoke insert is held on the vehicle wheel by three screw fasteners and such a wheel bears five such inserts, 15 screws are necessary. Thus, the use of material for fastening the insert elements per vehicle wheel is quite high, which moreover has a disadvantageous effect on the weight of the vehicle wheel. Due to the use of screws, such an insert can be loosened again for the purpose of repair or readjustment.
Tests have been carried out in order to connect such spoke inserts by clip-on connections to a light metal wheel having spokes, namely by forming locking fingers protruding on the rear side from the spoke insert and engaging behind the rear side of the spokes facing the vehicle. However, particularly in cast wheels, the problem associated with clipping the spokes from the rear is that a relatively high tolerance of the spoke thickness, thus the extension of such a spoke in axial direction, must be accepted. This tolerance resulting from tool wear is considerable and can be 1 to 1.5 mm. This tolerance cannot be compensated for using conventional clip-on connections, in particular if, at the same time, a permanent play- and thus rattle-free and secure connection is to be ensured.
From DE 20 2018 106 318 U1, a spoke insert for a vehicle wheel having the features of the type mentioned above at the start is known. In this previously disclosed insert element referred to as spoke insert, supporting bodies are formed on the rear side thereof. The supporting bodies have a formed fastening extension, by which the spoke insert is fastened on the vehicle wheel. The fastening extension has a supporting shoulder and a locking projection spaced therefrom. The locking projection is used for engaging behind a wheel-side installation opening implemented as bore, so that the marginal regions facing the insert element are supported on the supporting shoulder, while the locking projection engages behind the installation bore. The fastening extension itself has at least one gap according to its longitudinal extension, so that a diameter reduction in the region of its locking projection is possible, in order to be able to push said locking projection through the installation bore, before it relaxes on the rear side of the installation bore, so that the spoke insert is firmly secured in a form-fitting manner in axial direction in or on such an installation bore. Typically, such a spoke insert bears several such supporting bodies. The supporting bodies are formed on the insert element, consisting therefore of the same hard plastic material as the insert element which is also typically a plastic part.
In this previously disclosed spoke insert, it is advantageous that screws or other fasteners to be set with a tool are not necessary and that installation of the insert element occurs from only one side of the vehicle wheel, typically the visible side.
Even if in this previously disclosed spoke insert, installation on the vehicle wheel is simplified, a rattle-free seating of the insert elements cannot be guaranteed. Moreover, limitations exist with regard to a compensation in axial direction, which is necessary due to manufacturing tolerances. Moreover, with such an insert element, the desired pretensioning force can sometimes not be achieved. As axial compensation element, a foam rubber ring or a silicone ring implemented as O-ring is used, resulting in the axial pretensioning force. A defined seating of the insert element on the spoke flanks or the wheel disc is however not present. A defined junction, for example, by way of a gap between such an insert element and the vehicle wheel, is dependent on the tolerance situations of insert element and vehicle wheel.
Proceeding from this background, an aspect of the present disclosure is to further develop an insert element for a vehicle wheel, of the type mentioned at the start, in such a manner that the above-mentioned disadvantages are reduced, if not eliminated.
This is achieved according to the present disclosure by an insert element of the type mentioned at the start, wherein the supporting bodies are implemented as elastomer components which are elastically deformable in radial and axial direction and sit with their hollow channel on a supporting core, which supporting cores bear a radially protruding retaining flange and are held on the rear side on the insert element, wherein each supporting body is held by the retaining flange of the supporting core bearing it in a form-fitting manner against being pulled off from the supporting core.
In this insert element, the supporting bodies are designed as elastomer components. Said supporting bodies are elastic both in radial direction and in axial direction, at least in their sections which border the hole marginal regions of an installation opening, typically designed as installation bore, of the vehicle wheel. Due to this constitution of the supporting bodies designed as elastomer components, it is possible to compensate not only for tolerances with regard to the arrangement of the installation bores on the vehicle wheel and the arrangement of the elastomer components on the insert element and thus in radial direction by means of the resilience of the elastomer components, but also to compensate for axial tolerances. With such elastomer components, the hole marginal region of an installation opening of the vehicle wheel between the supporting shoulder and the locking projection can be bordered due to the elastic properties of the supporting body under considerable pretensioning. This is provided in a preferred embodiment example. In such an embodiment example, the distance of the surface of the supporting shoulder, by which the supporting body is supported on the supporting surface of the vehicle wheel, from the radial locking projection of the supporting body is slightly smaller than the material thickness of a wheel-side installation opening which is passed through by the supporting body. This means that according to a first design, the supporting shoulder on the complementary supporting surface of the vehicle wheel and the locking projection bear under pretensioning against the rear side of the installation bore, so that the hole marginal region bordering the installation bore is clamped in between these two abutments—the supporting shoulder and the locking projection. Thereby, such an insert element is connected to the vehicle wheel with play-free and rattle-free seating.
Due to the above-described measure, the insert element is also successfully held with a pretensioning force on the wheel-side installation flange, which, on the one hand, replaces a screw pretensioning force and, on the other hand, also ensures a defined bearing of the insert element against the vehicle wheel outer side, for example, on the spoke flank. In this way, it can be achieved that a peripherally uniform slot distance between the insert element and the spoke flank can be set. The latter is promoted if, on the insert element and/or on the vehicle wheel-side, multiple web- or cap-like protrusions are provided as spacer elements. These spacer elements form an abutment for setting a pretensioning, with which the supporting bodies act with their locking projections against the surface of an installation opening of the vehicle wheel facing away from the insert element. For the application of this pretensioning force, use is made of the possible compression of the locking projection of the elastomer supporting bodies in axial direction, which are held on the respective supporting core by the retaining flange protruding thereon in radial direction.
The material thickness of the locking projection in axial direction is typically designed in such a manner that a sufficient pretensioning force can also be provided taking into consideration all the tolerance situations in axial direction with insertion of the insert element.
The elastomer properties of the supporting body in axial direction are used for the installation, and namely in that the locking projection of the supporting body can be pressed sufficiently far through the installation opening so that the locking projection engages behind the installation opening on its side facing away from the insert element. Likewise, during the installation, the locking projection is compressed in radial direction as it is passed through the installation opening, so that the elastomer properties of the supporting body in radial direction are also used during the installation. According to an additional design, an arrangement of spacers arranged in the contact region between the vehicle wheel and the insert element, which may be designed, for example, as web- or cap-like projections, is used as abutment for a fastening point in addition to the retaining flange. The pretensioning force then results from the elastic resilience of the locking projection of the supporting body of a fastening point. Thereby, in such a design as well, a pretensioning force acts on the connection between insert element and vehicle wheel. In an additional design of such an embodiment example, the spacers, and likewise bodies with elastomer properties, are arranged on the insert element.
In this way, independently of its design, the insert element can be clamped to the vehicle wheel in a manner similar to a screw connection. This ensures not only a secure fastening of the insert element on the vehicle wheel but also likewise a rattle-free seating, even when the vehicle wheel is exposed to dynamic stresses. In radial direction as well, the supporting body can act by its holding section located between the supporting shoulder and the locking projection under pretensioning against the installation opening wall. The same applies when spacer elements are provided, which act at least by a vector component in peripheral direction, for example, against a ventilation hole flank.
The supporting bodies are held in axial direction in a form-fitting manner on the respective supporting core by the retaining flange against being pulled off the supporting core. The retaining flange protruding from the supporting core in radial direction, which is harder in comparison to the supporting core, forms an abutment for the supporting body designed as elastomer component. If a pull-off force (loosening force) is exerted on the insert element, the rear-side marginal regions bordering the installation opening act against the locking projection of the supporting body. By the abutment of the supporting body on the retaining flange, such a loosening force brings about a compression of the locking projection in axial direction, resulting in the locking projection trying to expand in radial direction. The form-fitting connection acting in radial direction between the supporting body and the vehicle wheel or the installation opening through which the supporting body reaches is strengthened in this manner, so that in this way a loosening of the insert element from the vehicle wheel is not possible, at least not in a destruction-free manner. Such an insert element can be loosened from the vehicle wheel, if the locking projection of the elastomer support body is shorn off due to the applied loosening force. This too is not a problem in the end, since, in the case of a new installation of the insert element, only the elastomer supporting body needs to be exchanged. In order to achieve this locking between the supporting body sitting on the supporting core and the installation flange of the vehicle wheel, the surfaces in contact with one another in this regard in axial direction are arranged in a plane extending transversely to the longitudinal extension of the supporting body. In an embodiment example, these cooperating surfaces are located in a plane extending at a right angle with respect to the longitudinal axis of the supporting body or supporting core. The surfaces which in this regard cooperate can also be oriented inclined at a small angle with respect to the above-described planes, in particular also in a direction opposite the pull-off direction. In such a design, the rear-side peripheral edge of the installation opening promotes the shearing off of the locking projection when sufficiently high forces are applied. This can be advantageous when insert elements are to be replaced.
These supporting bodies designed as elastomer components sit with their hollow channel on a supporting core. In contrast to the supporting bodies, the supporting core is not an elastomer component. While the supporting bodies are produced, for example, from a soft plastic component, the supporting cores are produced, for example, from a hard plastic component. As material for producing the supporting body, a material having a Shore-A hardness of 55-85 is suitable. For this purpose, silicone material can be used, for example. When the supporting cores, which by comparison are considerably harder, are made of plastic, they are made, for example, of a polyamide (with or without fiber reinforcement). It is understood that the supporting cores can also be made of metal. The latter possibility exists when the insert elements are metal parts, since the supporting cores can then be connected by means of a material joint connection to the insert elements themselves. On the one hand, the supporting cores are used for holding the supporting bodies on the insert element. On the other hand, they are used as abutment for applying the above-described pretensioning. For this purpose, each supporting core has a retaining flange arranged on its free end or on its end region in this regard and which protrudes in radial direction. By the retaining flange, the supporting body is held in a form-fitting manner on the support core in axial direction against being pulled off from the supporting core. The free end of the supporting body is formed by the end of the locking projection. Thus, in such a design, the locking projection of the supporting body is supported on the retaining flange. Thereby, the retaining flange enables the locking surface of the locking projection, which bears against the rear side of the installation opening of the vehicle wheel, to bear with corresponding pretensioning against the rear-side hole marginal region of the installation bore under pretensioning. According to one design, the abutment opposite the retaining flange for such a supporting body designed as elastomer component is provided by the rear side of the insert element or one or more supporting elements attached on the rear side of the insert element, for example, supporting bars arranged in radial direction with respect to the supporting core. Other supporting elements can also be provided, for example, an abutment shoulder on which the base surface of the supporting shoulder of the supporting body is supported. In order to achieve the desired pretensioning, by which the hole marginal regions of the installation bore are clamped in between the supporting shoulder and the locking projection of such a supporting body, it is not necessary for the pretensioning force to be peripherally equal. If, as insert element-side abutment, for example, several supporting bars in a radial arrangement with respect to the supporting core are used, the base surface of the supporting shoulder is supported on small sides of these bars, so that a force concentration occurs in the region of the support of the supporting shoulder on the supporting bars. In alignment with these supporting bars, the supporting shoulder acts with higher pretensioning on the complementary supporting surface of the vehicle wheel than in the supporting shoulder regions located between the supporting bars. In such a design, depending on the height of the supporting shoulder, a certain evening out of the pretensioning force over the contact surface of the supporting shoulder occurs on the complementary supporting surface of the vehicle wheel. Nevertheless, the advantages of an abutment element designed, for example, as supporting bars remain noticeable.
In one design, the supporting shoulder is designed as hollow chamber component which has several hollow chambers separated by a respective web extending in radial direction. In such a design, contact tolerances can be compensated in a special way, for example, if, as a result of production, the supporting surface of the vehicle wheel is not exactly parallel to the complementary surface of the supporting shoulder. Such compensation is in principle also possible with a solidly designed shoulder of the support body, but in this regard a supporting shoulder designed as a hollow chamber component enables a better compensation while ensuring the most peripherally uniform possible pretensioning acting on the supporting surface of the vehicle wheel. The hollow chambers can be open in direction of the rear side of the insert element, which simplifies the production of the supporting shoulder.
Such a supporting body designed as elastomer component is typically produced as an injection molded part but it can also be produced using additive or other manufacturing methods.
The pretensioning acting on the hole marginal regions of the installation opening of the vehicle wheel is achieved in that the distance of the locking surface of the locking projection from the surface of the supporting projection facing the supporting surface of the vehicle wheel is smaller in the untensioned state than the material thickness of the vehicle wheel in the region of its installation openings. The elasticity of the supporting shoulder of such a supporting body can also be used so that the locking projection of the support body can be pressed sufficiently far through an installation opening of the vehicle wheel so that this locking projection of reduced diameter within the installation bore automatically relaxes on the rear side of the installation opening in order to engage behind it, even if, during the installation process, the locking projection as a whole or in certain sections has been elastically shifted in the direction of the supporting shoulder.
In another design, the locking projection is supported by means of its locking surface under pretensioning on the rear side of the installation opening, wherein the counter-abutment is due to the contact arrangement between the insert element and the vehicle wheel occuring via spacer elements. These spacer elements are located in the region of the outer periphery on the side of such an insert element, which is not visible from the visible outward-facing side.
For the application of increased pretensioning in axial direction on the hole marginal regions of the installation bore, it can be provided that the locking surface of the supporting projection of the supporting body does not extend parallel to the contact surface of the vehicle wheel, at least in its inner region, but instead extends inclined with respect to said contact surface. By such a measure, the shape stability of the locking projection with respect to a shift in the direction of the supporting shoulder is increased. In addition, an increased pretensioning then acts on the junction between the wall of the installation bore and the surface regions bordering said installation bore. Such a measure can also be undertaken for adapting to the geometry of the installation opening, for example, if a bevel is provided on the rear side of the installation opening.
The supporting core can be designed as slotted or not slotted, wherein such a slot for the formation of a gap extends in longitudinal axial direction. If the supporting core is slotted, wherein the supporting core is typically divided into two supporting core segments in such a design, the core segments can be shifted in radial direction with their retaining flange, in particular toward one another for reducing the diameter of the retaining flange. In such a slotted design of the supporting core, the maximum diameter of the retaining flange can therefore be greater than the diameter of the installation opening. In transverse direction with respect to the extension of the maximum diameter of the retaining flange, on the other hand, the diameter is not greater than the diameter of the installation opening. The abutment formed by the retaining flange in such a design engages behind the installation opening. To achieve a pull-off protection, it can be provided to insert a securing pin in the gap separating the two supporting core segments, so that a movement of the supporting core segments in radial direction toward one another, whereby the diameter in the region of the retaining flange would be reduced, is blocked. Such a securing pin, as provided in an embodiment example, can be preinstalled in a manner so that it can be shifted in longitudinal axial direction on the supporting core. In such a design, the securing pin has, for example, guiding pins which engage in the gaps separating the supporting core segments. According to one design, such a securing pin has sections with different diameters. In the region of its head or in the region forming such a head, a blocking section is located which engages between the two supporting core segments for blocking the above-described diameter reduction movements. A section formed thereon has a smaller diameter so that, when this section is located in the region of the retaining flange, the supporting core segments can be shifted towards one another. During the installation and the removal of the insert element on the vehicle wheel or from the vehicle wheel, the securing element is in this position. After an installation, the securing pin is then inserted into the gap in order to block a loosening movement.
In another design, the supporting core is not slotted. In such a design, the diameter of the locking projection of the supporting body designed as elastomer component is greater than the diameter of the retaining flange and of the installation opening. In this design, the diameter of the retaining flange is smaller than the diameter of the installation opening of the vehicle wheel, so that said retaining flange can pass through the installation opening without problem. In the same way as described in the previous embodiment example, the front side of the locking projection is supported on the retaining flange.
In a preferred design, the supporting body sits by means of its hollow channel wall under pretensioning on the supporting core. By this measure, the fastening seating is improved. In addition, this measure promotes a rattle-free seating of the insert element on the vehicle wheel.
The below description is provided in reference to the appended figures based on embodiment examples, wherein:
and
In
In the embodiment example shown, the fastening of the insert element 6 occurs via three fastening points, wherein an installation of the insert element 6 on the vehicle wheel 1 occurs without a tool. The fastening points can be seen in the rear view of the vehicle wheel 1 of
The fastening point B1 shown in an enlarged perspective representation in
The supporting body 9 sits on the supporting core 8. For this purpose, the supporting body 9 has a hollow channel 10a (see
The supporting body 9 has a supporting shoulder 13 which bears with its base surface 14 against the small sides of the supporting bars 12, which face the retaining flange 10. The surface of the supporting shoulder 13 opposite the base surface 14 is a contact surface 15, against which the hole marginal region of the installation hole, which faces the insert element 6, bears as complementary supporting surface. A holding section 16 is formed on the supporting shoulder 13. The diameter of the holding section 16 substantially corresponds to the diameter of the installation bore. On the holding section 16, a locking projection 17 which is peripheral in the embodiment example shown is formed with a locking surface 18 facing the contact surface 15. The locking projection 17 protrudes beyond the holding section 16. The supporting body 9 is tapered by the holding section 16. The holding section 16 and the locking projection 17 together form a fastening extension. As can be seen in
In the embodiment example shown, the supporting shoulder 13 is designed as hollow chamber part and has several hollow chambers 19 arranged peripherally distributed. Two adjacent hollow chambers 19 are each separated from one another by a web 20 extending in radial direction.
The fastening point B1 is shown in cross section in
In
In a further development, it is provided that the supporting body 9 with its base surface 14, when attached to the installation flange 7 of the vehicle wheel 1, is not supported on the supporting bars 12, but it is provided that, in order to apply the desired pretensioning force, the abutment occurs due to the contact arrangement of the spacer elements A on the outer side of the vehicle wheel 1. In this design, a certain play is present between the base surface 14 of the supporting shoulder 13 of the supporting body 9 and the supporting bars 12. Thus, in this design, for applying the desired pretensioning, the retaining flange 10—on the one hand—and the contact arrangement of the supporting elements A on the outer side of the vehicle wheel 1—on the other hand—act as abutment. It is understood that the spacer elements can also be arranged on the vehicle wheel side.
The maximum diameter of the supporting core 8.1 in the region of its retaining flange 10.1 is greater than the diameter of the installation bore reaching through the installation flange 7. Therefore, the retaining flange 10.1 engages behind the installation bore of the vehicle wheel 1. The diameter of the locking projection 17.1 forming the locking surface 18.1 of the supporting body 9.1 corresponds to the maximum diameter of the retaining flange 10.1.
The securing pin 22 has a blocking section 23, the outer diameter of which corresponds to the inner diameter of the inner channel of the supporting body 8.1. On the blocking section 23, a head 24 is formed for handling the securing pin 22. In the direction of the insert element 6.1, on the blocking section 23, a section 25 with reduced diameter is formed. If the section 25 is located in the region of the retaining flange 10.1, as is the case at fastening point B5, the two supporting core half-shells can be moved toward one another in the region of their retaining flange 10.1. Then it is possible to bring them through the installation bore. In the securing position of the securing pin 22, shown in
In the embodiment example of
From this disclosure it becomes clear that not only can an insert element as described be mounted particularly simply, but also advantageous properties of a conventional screw connection can be implemented.
The invention has been described using embodiment examples. Without departing the scope of the claims, numerous embodiments, modifications and possibilities for implementing said invention arise for a person skilled in the art, without needing to explain or show them in further detail in the context of this disclosure.
1 Vehicle wheel
2 Wheel opening
3, 3.1 Spoke
4 Hub region
5 Rim well
6, 6.1 Insert element
7, 7.1 Installation flange
8, 8.1 Supporting core
9, 9.1 Supporting body
10, 10.1 Retaining flange
10
a Hollow channel
11, 11.1 Shaft section
12 Supporting bar
13, 13.1 Supporting shoulder
14 Base surface
15, 15.1 Contact surface
16, 16.1 Holding section
17, 17.1 Locking projection
18, 18.1 Locking surface
19 Hollow chamber
20 Web
21 Gap
22, 22.1 Securing pin
23 Blocking section
24 Head
25 Section
26 Small snap arms
A Spacer element
B1-B5 Fastening point
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 109 336.8 | Apr 2019 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/057639 | 3/19/2020 | WO | 00 |
