DE102021207985A1 - Motor vehicle wheel assembly and wheel cover - Google Patents

Abstract

The present disclosure relates to a wheel assembly for a motor vehicle, which comprises a steel disc wheel (10), a disc brake (20) and a wheel cover (30). The steel disc wheel (10) has a rim (11) and a wheel disc (12). The disc brake (20) comprises a brake disc (21) and a brake caliper (22). A number of ventilation openings (13) are guided through the wheel disc (12). At least one magnet (31) is arranged on the wheel cover (30) in such a way that a magnetic field (40) is formed between an inside of the wheel cover (30) and the ventilation openings (13). The present disclosure further relates to a corresponding wheel cover and a corresponding magnet.

Description

technical field

The invention relates to a wheel assembly for a motor vehicle, a wheel cover and a magnet.

State of the art

Friction brakes are usually used in motor vehicles to reduce speed. Friction brakes usually have one or more brake pads and at least one friction partner, e.g. a brake disc, on which at least one brake pad rubs. In a disc brake, for example, a brake disc can be made of cast iron, while steel wool is used as a main component for the brake pads. When braking, ferrous brake dust is generated. If this brake abrasion is not collected, particles of the brake abrasion are emitted into the environment, which increases the fine dust pollution. In addition, this abrasion, also known as brake dust, which can have particle sizes of around 10 nm - 10 µm, soils the wheel rims on which the brakes are mounted.

From the EP 2 151 596 B1 a device for collecting and/or retaining brake dust from a brake unit is known, which is based on a magnetic principle of action.

Brief description of the invention

Against this background, the invention is based on the object of providing an alternative device with which brake dust can be held back more efficiently.

Accordingly, a wheel assembly for a motor vehicle is proposed according to the main claim as well as a wheel cover and a magnet according to the independent claims. Further refinements are the subject matter of the respective dependent claims.

According to a first aspect of the invention, the object is achieved by a wheel assembly for a motor vehicle, comprising a steel disc wheel, a disc brake and a wheel cover. The steel disc wheel has a rim and a wheel disc. The disc brake includes a brake disc and a brake caliper. A number of ventilation openings are routed through the wheel disc. At least one magnet is arranged on the wheel cover in such a way that a magnetic field is formed between an inner side of the wheel cover and the ventilation openings.

The mostly magnetic particles of the brake pigeon are attracted by the magnet(s). The brake particles are deposited on the magnetic surface and are no longer released into the environment.

The arrangement of a magnetic brake particle collection device on the wheel cover is characterized by its ease of implementation, since only a wheel cover has to be adapted for this, while no changes are required to the wheel and wheel brake.

According to a further development of the wheel arrangement, the magnet can be designed as a one-piece magnet ring which is arranged coaxially to an axis of rotation of the steel disk wheel on the wheel cover.

The radii of such a magnetic ring can easily be adapted to the distance between the ventilation openings and the axis of rotation of the steel disc wheel and to the respective diameter of the ventilation openings. The magnetic ring and the ventilation openings are thus self-adjusting to one another when the wheel cover is installed on an outside of the steel disc wheel.

According to a development of the wheel arrangement, the magnet or magnets can be cast in a plastic body of the wheel cover.

A one-piece wheel cover with a cast-in magnet enables easy cleaning, which can be done with a high-pressure cleaner, for example.

According to a development of the wheel arrangement, the magnet or magnets can be detachably connected to the wheel cover via mechanical connecting elements.

The mechanical connecting elements can be designed, for example, as a clip connection, as a Velcro connection or as a bayonet-like mechanical connecting device. Thus, the magnet or magnets can be exchanged or cleaned independently of the wheel cover.

According to a further development of the wheel arrangement, the magnet or magnets can be glued to an inside of the wheel cover.

In particular, the magnet or magnets can be designed as an adhesive magnetic strip, which can thus be attached to the inside of the wheel cover in a self-adhesive manner.

According to a development of the wheel assembly, the wheel cover can be a closed wheel cover.

In electric vehicles in particular, there is no need to ventilate each wheel brake via openings in the wheel covers provided for this purpose, since the braking energy recovery (recuperation) produces less overall waste heat when braking. A closed wheel cover is therefore to be understood as meaning a wheel cover which has at least no unsealed openings between its inner and outer side. The steel disc wheel is thus fluidically sealed on the outside by the closed wheel cover.

The lack of flow of cooling air creates a turbulent flow inside the steel disc wheel, i.e. especially in the inner area between the wheel disc and the wheel cover. This turbulent behavior of the air favors the adhesion of the brake particles to the magnets.

The closed wheel covers reduce air turbulence, so that the range of electric vehicles increases. It is also advantageous that due to the lower flow rate inside the rim, less moisture and protection can reach the brake disc and brake caliper. This leads to less corrosion, so that brake noise is reduced.

According to an alternative development of the wheel arrangement, the magnet or magnets can be arranged on or within a number of openings in the wheel cover.

Through the openings on such an open wheel cover, air can flow through the steel disc wheel, which enables cooling of the wheel brake. The magnets placed on or within the openings can attract and trap the resulting brake particles in the airflow through the steel disc wheel.

According to an independent second aspect of the invention, the object is achieved by a wheel cover for a wheel assembly as described above. At least one magnet is or can be arranged on the wheel cover in such a way that a magnetic field can be aligned with a number of ventilation openings of a steel disk wheel.

According to a further development, a magnet can be designed as a one-piece magnetic ring which is or can be aligned coaxially to a central axis of the wheel cover.

The central axis of the wheel cover corresponds to the axis of rotation of the steel disc wheel when the wheel cover is attached to an outside of the steel disc wheel.

According to a development, at least one magnet can be cast in a plastic body of the wheel cover.

According to a development, a number of mechanical connecting elements can be arranged on an inner side of the wheel cover, which are designed for the detachable attachment of at least one magnet.

According to an alternative development, an adhesive surface for adhesive attachment of at least one magnet can be arranged on an inside of the wheel cover.

According to a third independent aspect of the invention, the object is achieved by a magnet for attachment to a wheel cover according to one of the aspects described above.

character list

• 1 zeigt ein Querschnitt durch eine erfindungsgemäße Radanordnung;
• 2 zeigt eine erste Alternative einer erfindungsgemäßen Radanordnung;
• 3 zeigt eine zweite Alternative einer erfindungsgemäßen Radanordnung;
• 4 zeigt eine Radanordnung gemäß Stand der Technik;
• 5 zeigt eine dritte Alternative einer erfindungsgemäßen Radanordnung.

Further features and details result from the following description, in which at least one exemplary embodiment is described in detail—if appropriate with reference to the drawing. Described and/or illustrated features form the subject matter alone or in any meaningful combination, possibly also independently of the claims, and in particular can also be the subject matter of one or more separate applications. Identical, similar and/or functionally identical parts are provided with the same reference symbols. show:

• 1 shows a cross section through a wheel assembly according to the invention;
• 2 shows a first alternative of a wheel assembly according to the invention;
• 3 shows a second alternative of a wheel assembly according to the invention;
• 4 shows a prior art wheel assembly;
• 5 shows a third alternative of a wheel assembly according to the invention.

Description of execution types

In the 1 1 shows a cross section through a wheel assembly 1 for a motor vehicle, which includes a steel disc wheel 10 with a rim 11 and a wheel disc 12 . A disc brake 20 is arranged on a radial inner side of the steel disc wheel 10 . A wheel cover 30 is mounted on a radially outer side of the steel disc wheel 10 .

The disc brake 20 has a brake disc 21 and a brake caliper 22 in which a pair of brake pads 23 are arranged in a movable, controllable manner. The brake pads 23 contain steel wool as an essential material component. The brake disc 21 is made of cast iron and is centered on the wheel disc 12 by means of a hub bore. The brake disc can be screwed to the wheel disc 12 of the steel disc wheel 10 via a number of wheel nuts, which are not shown in the figure.

A number of ventilation openings 13 are guided through the wheel disc 12 and are arranged at a uniform radius to an axis of rotation of the steel disc wheel 10 at a distance from one another in the radial direction. Furthermore, the ventilation openings 13 are placed in the wheel disc 12 in a circumferentially spaced-apart manner.

During a braking process, the brake pads 23 are pressed against the friction ring 24 of the brake disk 21 by means of an actuator in the brake caliper 22 . Friction between the brake pads 23 and the friction ring 24 produces ferrous brake particles 50 which flow at least partially through the ventilation openings 13 into an intermediate space between the wheel disc 12 and the wheel cover 30 .

A magnet 31 is arranged on the wheel cover 30 in such a way that a magnetic field 40 is formed between an inner side of the wheel cover 30 and the ventilation openings 13 of the wheel disk 12 . The magnetic braking particles 50 that have flowed through the ventilation openings 13 are attracted by the magnet 31 . The magnetic brake particles 50 generated during the braking process remain in or under the wheel cover 30 and do not escape into the environment.

The magnet 31 is ring-shaped in the present example, with the radii of such a magnet ring being adapted to the distance between the ventilation openings 13 and the axis of rotation of the steel disc wheel 10 and to the respective diameter of the ventilation openings 31 . The magnetic ring can be glued to the inside of the wheel cover 30, for example. The ring-shaped magnet 31 can be designed as an adhesive magnetic tape. A groove-shaped adhesive surface for receiving the magnetic ring in the wheel cover 30 can be provided as an assembly or centering aid.

In the 2 a first alternative exemplary embodiment of a wheel assembly 1 according to the invention and a corresponding wheel cover 30 is shown. An annular magnet 31 is molded in a plastic body of wheel cover 30 . Such a one-piece design of the wheel cover 30 and magnet 31 enables simple servicing, since cleaning can be carried out using a high-pressure cleaner, for example.

Like in the 3 As can be seen, a preferably ring-shaped magnet 31 can alternatively also be detachably connected to the wheel cover 30 by means of a clip connection 32 . Thus, the magnet 31 can be replaced independently of the wheel cover 30, for example when its brake dust collecting capacity is exhausted. Instead of the sketched clip connection 32, other common mechanical locks can also be provided for a detachable connection.

In electric vehicles, an air flow to cool the wheel brakes is usually no longer necessary, since a large part of the deceleration energy can be recuperated during the braking process and therefore no longer has to be converted into heat, as is usual in vehicles with combustion engines. The in the 1 until 3 Wheel covers 30 shown can therefore preferably have a closed shape. That means that on the in the 4 Openings 32 shown in the wheel cover 30, which are common in conventionally powered motor vehicles and fluidically communicate with the ventilation openings 13 of the wheel disc 12, can be dispensed with.

When the wheel cover 30 is closed, the lack of flow of cooling air causes the air to behave turbulently inside the steel disc wheel 10 , which promotes the adhesion of the brake particles 50 to the magnet 31 .

From the 5 it follows that a corresponding arrangement of magnets 31 for collecting magnetic brake particles 50 can also be used in connection with an open, ie with a ventilated, wheel cover 30 . For this purpose, one or more magnets 31 are suitably arranged on or in the openings 32 of a corresponding wheel cover 30 .

As compared to the 4 can be seen, get less ent during braking standing magnetic brake particles 50 through the openings 32 of the open wheel cover 30 into the environment.

Although the subject matter has been illustrated and explained in more detail by exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived therefrom by a person skilled in the art. It is therefore clear that a large number of possible variations exist. It is also understood that exemplary embodiments are only examples and should not be construed as limiting in any way the scope, applications, or configuration of the invention. Rather, the preceding description and the description of the figures enable the person skilled in the art to concretely implement the exemplary embodiments, whereby the person skilled in the art, knowing the disclosed inventive idea, can make a variety of changes, for example with regard to the function or the arrangement of individual elements mentioned in an exemplary embodiment, without having to Leaving the scope of protection defined by the claims and their legal equivalents, such as further explanations in the description.

Reference List

1

wheel assembly

10

steel disc wheel

11

rim

12

wheel disk

13

ventilation opening

20

disc brake

21

brake disc

22

caliper

23

brake pad

24

friction ring

30

wheel cover

31

magnet

32

opening

40

magnetic field

50

brake particles

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 2151596 B1 [0003]

Claims (13)

Wheel arrangement for a motor vehicle, comprising a steel disc wheel (10) with a rim (11) and a wheel disc (12), a disc brake (20) with a brake disc (21) and a brake caliper (22) and a wheel cover (30), with a number of ventilation openings (13) are guided in the wheel disc (12), and at least one magnet (31) is arranged on the wheel cover (30) in such a way that between an inside of the wheel cover (30) and the ventilation openings (13) Magnetic field (40) is formed. Wheel assembly according to one of the preceding claims, wherein the magnet (31) is formed as a one-piece magnet ring which is arranged coaxially with an axis of rotation of the steel disc wheel (10) on the wheel cover (30). Wheel arrangement according to one of the preceding claims, wherein the magnet or magnets (31) is cast in a plastic body of the wheel cover (30). Wheel assembly according to any of the preceding Claims 1 until 3 , wherein the magnet or magnets (31) are releasably connected to the wheel cover (30) via mechanical connecting elements. Wheel assembly according to one of Claims 1 until 3 , wherein the magnet or magnets (31) is glued to an inside of the wheel cover (30). Wheel assembly according to any of the preceding Claims 1 until 5 , wherein the wheel cover (30) is a closed wheel cover. Wheel assembly according to one of Claims 1 until 5 wherein the magnet or magnets (31) are arranged at or within a number of openings (32) in the wheel cover (30). Wheel cover for a wheel arrangement (1) according to one of the preceding claims, on which at least one magnet (31) is or can be arranged in such a way that a magnetic field (40) can be aligned with a number of ventilation openings (13) of a steel disc wheel (10). Wheel cover according to the above claim 8 , wherein a magnet (31) is designed as a one-piece magnet ring which is aligned or alignable coaxially to a central axis of the wheel cover (30). Wheel cover according to any of the foregoing Claims 8 or 9 , wherein at least one magnet (31) is cast in a plastic body of the wheel cover (30). Wheel cover according to one of Claims 8 or 9 , wherein a number of mechanical connecting elements are arranged on an inner side, which are designed for the detachable attachment of at least one magnet (31). Wheel cover according to one of Claims 8 or 9 , An adhesive surface for adhesive attachment of at least one magnet (31) being arranged on an inner side. Magnet for attachment to a wheel cover (30) according to any one of the preceding Claims 11 or 12 .

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