Wheel assembly of a vehicle and vehicle with such a wheel assembly

Abstract

The invention relates to a wheel device (2) of a vehicle, comprising at least one wheel (4) encompassing a rim (6) which is rotatable about an axis of rotation (8), comprising at least one brake unit (10), wherein the brake unit (10) has at least one support body (12) rotatable about the axis of rotation (8), which is directly or indirectly connected to the wheel (4) in a rotationally fixed manner and which comprises at least one friction layer (16) forming a braking surface (14) and subject to wear, and wherein the brake unit (10) has at least one braking agent (18) which, for braking the vehicle, bears against the braking surface (14) of the support body (12) in a manner that causes wear, and at least one magnetic unit (20) comprising at least one magnetic means (22) by which magnetic or magnetizable brake abrasion, in particular from the friction layer (16) and / or from the braking agent (18), is magnetically attracted.wherein at least one of the at least one magnetic means (22) is fixed to the rim (6) of the wheel (4).

Description

The invention relates to a wheel device of a vehicle and to a vehicle having such a wheel device.During operation of a motor vehicle, in particular during braking of the motor vehicle, a braking means is applied to a braking surface of a contact body in a contacting and wear-generating manner. Due to the prevailing friction, it can never be entirely avoided that particles are released from the friction layer of the contact body or of the brake means during braking and reach the environment.In the known contact bodies, these consist in their entirety of gray cast iron or of coated contact bodies. The abrasion that is produced, the brake particles, is metallic and can lead to damage in the lung and in the human body.From the prior art, wheel devices are known in which magnetic means of a magnet unit are arranged in the immediate vicinity of the braking means and / or the contact means in order to magnetically attract and store the abrasion.An object of an exemplary embodiment of the invention is to propose a wheel device for a vehicle in which the number of brake particles released to the environment is further reduced during a braking operation.This object is achieved by a wheel device of a vehicle, having at least one wheel comprising a rim, which wheel is rotatable about an axis of rotation, having at least one brake unit, wherein the brake unit has at least one bearing body which is rotatable about the axis of rotation and is connected in a rotationally fixed manner to the wheel directly or indirectly and which comprises at least one friction layer which forms a brake surface and is subject to wear, and wherein the brake unit has at least one brake means which, for braking the vehicle, bears in a contacting manner and in a wear-generating manner against the brake surface of the bearing body, and at least one magnet unit which comprises at least one magnet means by means of which magnetic or magnetizable brake abrasion, in particular from the friction layer and / or from the brake means, can be magnetically attracted, wherein at least one of the at least one magnet means is fixed to the rim of the wheel.By virtue of the fact that the wheel device comprises a magnet unit which has at least one magnet means which is fixed to the rim of the wheel, magnetic or magnetizable brake abrasion which leaves the brake unit can be attracted and bonded by said magnet means. As a result, the number of brake particles that can be reached to the environment is further reduced.The at least one magnet means of the magnet unit can in principle be arranged at any desired location on the rim. Embodiments of the wheel device are conceivable in which one of the at least one magnetic means of the magnetic unit is arranged on a side of the rim facing the brake unit or facing away from the brake unit and / or in which at least one of the at least one magnetic means is arranged, in particular cast, within the rim.If the magnetic means is arranged on a side of the rim facing the brake unit or on a side of the rim facing away from the brake unit, the at least one magnetic means can be placed where space-saving capacitances are present in a rim which is already present.If at least one of the at least one magnetic means is arranged within the rim, the rim can be designed to be optically appealing and the magnetic means can be arranged captive within the rim. In such a case, the magnetic or magnetizable brake particles adhere to the surface of the rim on account of the magnetic attraction of the at least one magnetic means acting through the rim.In order to make the wheel device compact, it proves to be advantageous if the rim comprises at least two spokes, wherein at least one spoke of the rim comprises, on the side facing the brake unit, at least one material-free depression in which at least one of the at least one magnetic means can be arranged or is arranged.In most currently used rims, the spokes comprise pockets and cavities which form the material-free depression for weight reduction reasons. These pockets or cavities, which form the material-free depressions, are arranged on the side facing the vehicle center, that is to say on the side facing the brake unit. As a result, the at least one magnetic means can be arranged in material-free depressions of the rim, in particular of the spokes of the rim, which depressions are present in any case.The at least one magnetic means can in principle comprise any desired shape, provided that it follows the technical function of attracting and binding magnetizable or magnetized brake abrasion. Embodiments of the wheel device are conceivable in which at least one of the at least one magnetic means of the magnetic unit comprises a magnetic body comprising a three-dimensional shape, a substantially planar magnetic film or a substantially planar magnetic tape.The magnetic means can in principle be designed in any desired manner. For example, the magnetic means can comprise an electromagnet which is energized during operation of the vehicle. The wheel device can be formed easily and economically if at least one of the at least one magnet means of the magnet unit comprises a neodymium magnet or a hard ferrite magnet.If at least one of the at least one magnetic means comprises a neodymium magnet or a hard ferrite magnet, a high magnetic field can be generated permanently.In addition, it has proven to be advantageous if at least one of the at least one magnetic means is fixed to the rim in a releasable manner, in particular by means of force or form closure, in particular by means of screw connection, or in a non-releasable manner, in particular by means of force, form closure or material connection, in particular by means of adhesive bonding, riveting, soldering or welding.If at least one of the at least one magnetic means of the magnet unit is detachably fixed to the rim, the magnetic means can be easily replaced. This can make sense, for example, when changing from winter wheels to summer wheels and vice versa. In such a case, one and the same magnetic means may be used for a plurality of rims.If at least one of the at least one magnetic means is non-detachably fixed to the rim, it is possible to reduce the amount of play between the magnetic means and the rim.In principle, it is conceivable for the magnet unit to comprise a single magnetic means. In embodiments of the wheel device, it proves to be advantageous if the magnet unit comprises a plurality of magnet means which are arranged uniformly distributed on the rim, in particular on or in the spokes, in the circumferential direction with respect to the axis of rotation.The brake unit can basically comprise any desired brake unit. Embodiments of the wheel device are conceivable in which the brake unit comprises a disc brake, wherein the contact body is formed as a brake disc, or that the brake unit comprises a drum brake, wherein the contact body is formed as a brake drum.If the brake unit comprises a disc brake, the contact body is substantially planar and disc-shaped. The contact body is then arranged substantially parallel to the rim.If the brake unit comprises a drum brake, the contact body, which is designed as a brake drum, runs substantially along a circumferential direction with respect to the axis of rotation. During braking, the braking means is moved in the direction transverse to the axis of rotation in such a way.The rim can basically comprise any desired rim. It has proven to be advantageous if the rim comprises a metal rim or an aluminum rim.Finally, the object is achieved by a motor vehicle having a wheel device with at least one of the aforementioned features.Further features, details and advantages of the invention are evident from the appended patent claims, from the drawing and from the following description of a preferred embodiment of the wheel device.The drawing shows: FIG. 1 shows a side view of an exemplary embodiment of the wheel device; FIG. 2 shows an isometric individual illustration of the brake unit according to FIG. 1 ; FIG. 3 shows a rear view of a wheel with a magnet unit of the exemplary embodiment according to FIG. 1.FIG. 1 shows a wheel device of a vehicle provided overall with the reference numeral 2 (not explicitly shown in the figures). The wheel device 2 comprises a wheel 4 having a rim 6. The wheel 4 is rotatable about an axis of rotation 8.In addition, the wheel device 2 comprises a brake unit 10 which has a contact body 12 which can be rotated about the axis of rotation 8 and is connected to the wheel 4 in a rotationally fixed manner and which comprises at least one friction layer 16 which forms a brake surface 14 and is under wear. In addition, the brake unit 10 comprises a brake means 18 which, for braking the vehicle, bears in contact and generating wear against the brake surface 14 of the contact body 12. The contact body 12 illustrated in the figures is a brake disc. The brake unit 10 includes a disc brake.Moreover, the wheel device 2 comprises a magnet unit 20 comprising a plurality of magnet means 22. Magnetic or magnetizable brake abrasion, in particular from the friction layer 16 and / or from the brake means 18, can be magnetically attracted by the magnetic means 22 of the magnetic unit 20. The magnet means 22 of the magnet unit 20 are fixed to the rim 6 of the wheel 4 in the exemplary embodiment shown in the figures.FIG. 2 shows a perspective detailed view of the brake unit 10 according to FIG. 1, and it can be seen from FIG. 2 that the brake unit 10 in the exemplary embodiment shown is a disc brake.FIG. 3 is a rear view of the wheel 4 according to FIG. 1.It can be seen from FIG. 3 that the wheel 4, in particular the rim 6, comprises a plurality of spokes 24, which each comprise material-free depressions 26, in which magnetic means 22 are arranged. In the exemplary embodiment shown in the figures, the magnetic means 22 each comprise a three-dimensional magnetic body which is arranged in an unreleasable manner in the respective depression 26.The operation of the wheel device 2 will be described briefly below:During operation of the vehicle, the wheels 4 of the vehicle rotate and the contact bodies 12 connected to the respective wheel 4 in a rotationally fixed manner. For braking the vehicle, the brake unit 10 is actuated, wherein the brake means 18 is applied to the brake surface 14 of the friction layer 16. Particles which are magnetic or magnetizable can be released from the braking surface 14 or from the braking means 18. This magnetically or magnetized brake abrasion is attracted and bound by the magnetic bodies when the magnetic or magnetizable brake abrasion is located in the effective range of the magnetic field of the respective magnetic means 22.The features of the invention disclosed in the above description, in the claims and in the drawing can be essential both individually and in any combination in the realisation of the invention in its various embodiments within the scope of the following claims.List of reference characters2 Wheel device 4 Wheel 6 Rim 8 Axis of rotation 10 Brake unit 12 Contact body 14 Brake surface 16 Friction layer 18 Brake means 20 Magnet unit 22 Magnet means 24 Spoke 26 Depression

Claims

Wheel device (2) of a vehicle, having at least one wheel (4) comprising a rim (6) and which is rotatable about an axis of rotation (8), having at least one brake unit (10), wherein the brake unit (10) has at least one bearing body (12) which is rotatable about the axis of rotation (8) and is connected in a rotationally fixed manner directly or indirectly to the wheel (4) and which comprises at least one friction layer (16) which forms a brake surface (14) and is subject to wear, and wherein the brake unit (10) has at least one brake means (18) which, for braking the vehicle, bears in a contacting and wear-generating manner against the brake surface (14) of the bearing body (12), and having at least one magnet unit (20) which comprises at least one magnet means (22), as a result of the magnetic or magnetizable brake abrasion, in particular of the friction layer (16) and / or of the brake means (18), The magnetic attachment may be magnetically attractable, wherein at least one of the at least one magnetic means (22) is fixed to the rim (6) of the wheel (4).Wheel device (2) according to Claim 1, characterized in that at least one of the at least one magnetic means (22) of the magnetic unit (20) is arranged on a side of the rim (6) facing the brake unit (10) or facing away from the brake unit (10), and / or in that at least one of the at least one magnetic means (22) is arranged, in particular is cast, within the rim (6).Wheel device (2) according to claim 1 or 2, characterised in that the rim (6) comprises at least two spokes (24), wherein at least one spoke (24) of the rim (6) comprises at least one material-free depression (26) on the side facing the brake unit (10), in which at least one of the at least one magnetic means (22) can be arranged or is arranged.Wheel device (2) according to one of the preceding claims, characterized in that at least one of the at least one magnetic means (22) of the magnet unit (20) comprises a magnetic body comprising a three-dimensional shape, a substantially planar magnetic film or a substantially planar magnetic tape.Wheel device (2) according to any one of the preceding claims, characterized in that at least one of the at least one magnetic means (22) of the magnet unit (20) comprises a neodymium magnet or a hard ferrite magnet.Wheel device (2) according to one of the preceding claims, characterized in that at least one of the at least one magnetic means (22) is fixed to the rim in a releasable manner, in particular by means of force or form closure, in particular by means of screw connection, or in a non-releasable manner, in particular by means of force, form closure or material closure, in particular by means of adhesive bonding, riveting, soldering or welding.Wheel device (2) according to one of the preceding claims, characterized in that the magnet unit (20) comprises a plurality of magnet means (22) which are arranged uniformly distributed on the rim (6), in particular on or in the spokes (24), in the circumferential direction with respect to the axis of rotation (8).Wheel device (2) according to one of the preceding claims, characterized in that the brake unit (10) comprises a disc brake, wherein the contact body (12) is designed as a brake disc, or in that the brake unit (10) comprises a drum brake, wherein the contact body (12) is designed as a brake drum.Wheel device (2) according to one of the preceding claims, characterized in that the rim (6) comprises a metal rim or an aluminium rim.Motor vehicle having a wheel device (2) according to one of Claims 1 to 9.

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