Fan wheel for a fan, fan for a motor vehicle, and motor vehicle with fan

Abstract

Fan wheel for a motor vehicle fan, with at least one axial blade (13) by means of which air is conveyed in the axial direction (12) of the fan wheel by rotating the fan wheel about an axis of rotation (11), wherein the fan wheel has at least one radial blade (14) in a region adjoining the axial blade (13) in the radial direction of the fan wheel, by means of which the air is conveyed outwards in the radial direction of the fan wheel by rotating the fan wheel about the axis of rotation (11), characterized in that: - the at least one axial blade (13) forms an axial blade assembly by means of which the air is conveyed in the axial direction (12) of the fan wheel by rotating the fan wheel about the axis of rotation (11); - the at least one radial blade (14) forms a radial blade assembly by means of which, by rotating the fan wheel about the axis of rotation (11), the air is conveyed outwards in the radial direction of the fan wheel; and - via an outflow area of ​​the radial blade assembly, when the fan wheel is rotated about the axis of rotation (11), the air conveyed by means of the radial blade assembly flows outwards in the radial direction of the fan wheel in the axial direction (12) of the fan wheel partly in front of the axial blade assembly and partly behind the axial blade assembly.

Description

[0001] The invention relates to a fan wheel for a motor vehicle fan according to the preamble of claim 1 and a fan for a motor vehicle according to the preamble of claim 3. The invention also relates to a motor vehicle.

[0002] From GB 2 486 019 B, a heat dissipation device with an impeller is known, wherein the impeller comprises a hub with a plurality of rotor blades arranged around the hub, each radially inner side of the rotor blades extending radially towards a center of the hub, and a radially innermost section of each rotor blade extending axially beyond a front surface of the hub, and the rotor blades being configured such that, in operation, air is driven in a substantially axial direction.

[0003] From GB 2 395 233 B a fan for residential use is known, wherein the fan comprises an impeller with a conical hub, wherein a plurality of blades each has a leading edge, a trailing edge, an inner side edge connected to and partially extending around the outer surface of the hub, an outer side edge opposite the inner side edge, and a blade tip located at the intersection of the leading edge and the outer side edge.

[0004] From DE 199 29 978 A1 an axial fan is known, in particular for radiators of motor vehicles, wherein the axial blades are attached to a fan hub and the fan hub in turn is connected to a fluid friction coupling.

[0005] From DE 10 2019 216 704 A1, a fan wheel for a radiator fan or for a radiator fan module of a motor vehicle is described, comprising a blading arrangement of a number of radiator fan blades arranged on a hub and directed radially outwards, wherein each radiator fan blade has a leading edge and a trailing edge as well as a blade tip and a blade root, wherein the radiator fan blade has a hollow wall with a wall top and a wall bottom, and wherein a number of stiffening elements are arranged between the wall top and the wall bottom of the hollow wall.

[0006] From DE 10 2017 203 731 A1 a fan is known which comprises an electric motor and a fan wheel.

[0007] From DE 10 2009 055 609 A1, a fan for an internal combustion engine is known, which has a fan wheel driven by an electric motor arranged in a hub, which is designed with a plurality of fan blades arranged on the hub, wherein the hub is designed with a hub end face and a hub shell surface, wherein a plurality of recesses are provided in the hub shell surface, which divide the hub shell surface into a plurality of blade-like elements.

[0008] The invention is based on the objective of providing a particularly efficient fan wheel for a fan, a particularly efficient fan comprising this fan wheel for a motor vehicle and a motor vehicle with this fan.

[0009] The problem is solved by a fan wheel with the features of claim 1, a fan with the features of claim 2, and a motor vehicle with the features of claim 9. Advantageous embodiments of the invention are described by the dependent claims, the following description, and the figures.

[0010] A first aspect of the invention relates to a fan wheel for a motor vehicle fan, comprising at least one axial blade, by means of which air is conveyed in the axial direction of the fan wheel by rotating the fan wheel about an axis of rotation. The fan wheel has at least one radial blade in a region extending inwards in the radial direction of the fan wheel, by means of which air is conveyed outwards in the radial direction of the fan wheel by rotating the fan wheel about the axis of rotation.

[0011] This results in the advantage that the total airflow or total air mass flow conveyed in the axial direction by the fan wheel is increased by supplying the airflow that hits the area adjoining to the inside through at least one radial blade to the axial airflow.

[0012] The axial direction here refers to a direction perpendicular to the plane in which the at least one axial blade rotates or moves, i.e., to the plane of rotation of the at least one axial blade. The at least one axial blade can be designed as is known from the prior art for axial fans. The conveyance direction, i.e., the direction in which the air is conveyed by the at least one axial blade, is determined by the angle or inclination of the axial blade in conjunction with the direction of rotation. Based on the axial direction, an upstream side or front is defined here by the fact that the air flowing through the fan wheel in an axial direction passes through the plane of rotation from this side. An downstream side or rear of the fan wheel is defined by the fact that the air flowing through it leaves the plane of rotation from this side, or flows away from it.The axis of rotation is characterized by being perpendicular to the plane of rotation, and the at least one axial blade rotates around this axis. "Radial inwards" here means pointing towards the axis of rotation in the plane of rotation. "Radial outwards" here means pointing away from the axis of rotation in the plane of rotation. Air is to be guided radially outwards from an inner region, which adjoins the at least one axial blade in a radially inward direction, through the at least one radial blade. The radially outward-directed air is to be introduced into the axial airflow. The at least one radial blade can be designed as is known from the prior art for radial fans. The inner region can be designed to be axially impermeable. For the purposes of this invention, "air" generally refers to the medium air, regardless of whether a specific or indefinite article is used.

[0013] The invention also includes embodiments that offer additional advantages.

[0014] In a further development of the invention, the at least one axial blade forms an axial blade assembly by means of which air is conveyed in the axial direction of the fan wheel by rotating the fan wheel about its axis of rotation. The at least one radial blade forms a radial blade assembly by means of which air is conveyed outwards in the radial direction of the fan wheel by rotating the fan wheel about its axis of rotation. The fan wheel has an outflow area of ​​the radial blade assembly through which, when the fan wheel is rotated about its axis of rotation, the air conveyed by the radial blade assembly flows outwards in the radial direction of the fan wheel, partly in front of the axial blade assembly and partly behind the axial blade assembly.

[0015] This has the advantage that the radially flowing air is introduced uniformly into the axial airflow and accelerated axially, thus reducing efficiency-reducing air turbulence.

[0016] The axial blade assembly can comprise one or more axial blades, and the radial blade assembly can comprise one or more radial blades. Specifically, the fan wheel is designed to have an equal number of axial and radial blades. The outflow area can be a boundary region between the radial and axial blade assemblies, i.e., the region where the radial blade assembly borders the axial blade assembly. Within the outflow area, the radially conveyed air can be directed both in front of and behind each axial blade.

[0017] A second aspect of the invention relates to a fan for a motor vehicle with a fan wheel, according to at least one of the previously described embodiments or configurations. In this second aspect of the invention, the described fan wheel thus constitutes a part of the fan or is encompassed by it.

[0018] In a further development of the invention, the fan has an intake element which adjoins an inner area in the axial direction of the fan wheel and through which air can flow in the axial direction of the fan wheel, and through which the at least one radial blade can be supplied with air.

[0019] The intake element allows the airflow on the inlet side—that is, the airflow flowing axially towards the plane of rotation—to be divided into a portion that is to be conveyed radially outwards by the radial fan assembly and a portion that, together with the radially conveyed portion, is to be conveyed axially through the plane of rotation. This has the advantage of reducing efficiency-reducing air turbulence on the inlet side. The intake element can be bounded by a wall that extends perpendicularly away from the inner area or the plane of rotation, opposite to the axial direction or an axial airflow direction, away from the inlet side of the fan wheel.The intake element can have an air inlet opening that is open, i.e., not closed by the wall, and is arranged in a plane that extends parallel to the plane of rotation and in which the wall has a maximum distance to the plane of rotation.

[0020] In a further development of the invention, the at least one radial blade extends from a surface having the inner region in the axial direction away from the fan wheel towards the intake element, wherein the intake element is spaced away from the surface, whereby a gap through which flow can occur in the radial direction of the fan wheel is formed between the surface and the intake element.

[0021] This offers the advantage that the outflow area is defined by the flow-through gap, and the radially conveyed or conveyed air only mixes with the axially conveyed or conveyed air after flowing radially outwards through the gap. This reduces or eliminates upstream air turbulence that reduces efficiency.

[0022] In a further development of the invention, a root area of ​​the at least one axial blade extends radially outwards from the surface towards the intake element and thus at least partially across the gap, following the inner area of ​​the fan wheel.

[0023] If the root area extends across the entire gap and is thus connected to the intake element by material, force, or form-fit, the advantage arises that the fan wheel and the intake element can be manufactured as a single unit, for example, using a 3D printing process (3D: three-dimensional). This reduces the assembly effort when putting together or manufacturing the fan. If the root area is connected to the intake element as described, the intake element rotates with the fan wheel around its axis of rotation. If the intake element is not connected to the root area, the root area may only partially extend across the gap, and the intake element will not rotate with the fan wheel when the fan wheel turns.In both cases, the advantage arises that at least one axial blade is simultaneously engaged in the described arrangement, which is necessary to convey air axially through the plane of rotation. Additionally, in both cases, the radially conveyed air can be introduced into the axial airflow both in front of and behind the at least one axial blade, and thus both in front of and behind the axial blade assembly, due to the at least partial extension of the root area across the gap, which can represent the outflow area. This again results in the advantage already described.

[0024] In a further development of the invention, a wall area that encloses the air inlet opening of the intake element has a chamfer.

[0025] The chamfer, which can also be described as a slope, offers the advantage of reducing flow losses as air enters the intake element, thereby increasing the overall efficiency of the fan. Without the chamfer, a vertical surface of the wall area, perpendicular to the direction of airflow, would be formed around the air inlet opening of the intake element. This surface would cause some of the airflow to back up, leading to turbulence and flow losses that reduce efficiency. The wall area can be enclosed by the wall or be part of the wall that surrounds the intake element (see above).

[0026] In a further development of the invention, the fan has a fan frame in a region extending radially outwards from the at least one axial blade, which surrounds the fan wheel in the circumferential direction.

[0027] The fan shroud offers the advantage that the air to be conveyed by the fan is guided in an axial direction, thus reducing mixing or turbulence with the ambient air, which is not intended to pass axially through the fan, and thereby minimizing flow losses. The fan shroud can be designed as known from the prior art for axial fans. The fan shroud need not be materially, forcefully, or positively connected to the fan wheel, so that it does not rotate with the fan wheel around its axis of rotation when the fan wheel rotates.

[0028] In a further development of the invention, the intake element is held attached to the fan frame by means of at least one strut. Two embodiments of this embodiment can be distinguished. In a first embodiment, the fan frame and the intake element, connected by the at least one strut, can rotate with the fan wheel. In this case, the intake element can be connected to the fan wheel, or the fan frame to the fan wheel, or the intake element and the fan frame together. In a second preferred embodiment, neither the fan frame nor the intake element is connected to the fan wheel, so that neither they nor both of them rotate with the fan wheel.

[0029] This offers the advantage of increased fan stability thanks to at least one strut. Particularly when the fan is installed in a vehicle, this prevents damage or displacement of the intake element from its intended position, for example, due to vibrations when a vehicle containing the fan drives over a pothole. Depending on the material used, one or more struts may be incorporated, requiring appropriate expert considerations.

[0030] In particular, the fan, impeller, and intake element are designed to be rotationally symmetrical about the axis of rotation. The fan, impeller, and fan housing can be made of plastic, CFRP (carbon fiber reinforced plastic), GFRP (glass fiber reinforced plastic), and / or metal.

[0031] A third aspect of the invention relates to a motor vehicle with a fan according to at least one of the previously described further developments or embodiments of the fan.

[0032] Further advantages, features, and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. The features and combinations of features mentioned above in the description, as well as those mentioned below in the figure description and / or shown in the figures alone, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention.

[0033] This shows: Fig. 1 a schematic representation of an installation area of ​​a motor vehicle for a fan; Fig. 2. Partially a schematic perspective view of the fan with fan wheel with an axial blade assembly rotatable about an axis of rotation and a radial blade assembly rotatable about the same axis of rotation; Fig. 3 a schematic frontal view from an axial direction of the fan with an intake element held by struts on a fan frame; Fig. 4 a schematic perspective view of the fan with the intake element having a chamfer in a wall area enclosing an air inlet opening and shown transparently; and Fig. 5 another schematic perspective view of the fan with the intake element shown opaquely.

[0034] In the illustrations, identical elements or elements with the same function are indicated by the same reference symbols.

[0035] Fig. Figure 1 schematically shows a possible installation area 10 or location for a fan in a motor vehicle. The fan can be installed, in particular, in a front area of ​​the vehicle in the direction of travel, especially under the hood and in front of an internal combustion engine and behind an air intake of the vehicle. This allows the fan to draw in air through the air intake while the vehicle is in motion and / or when stationary, and to direct it towards the internal combustion engine for cooling purposes, against the direction of travel. The use or arrangement of the fan can correspond to that of engine blowers known from the prior art.

[0036] Fig. Figure 2 shows a schematic perspective view of a section of the fan with a fan wheel. The fan wheel can be rotatably mounted about a pivot axis 11. In this embodiment, the fan wheel can have an inner area that is radially closer to or directly adjacent to the pivot axis 11 than an outer area. In a [context missing] shown here in Fig. In the embodiment shown in Figure 2, the inner region can comprise or have four radial blades 14. An outer region can extend radially outwards from the inner region. In this embodiment, this outer region can comprise four axial blades 13. The radial blades 14 can form a radial blade assembly, and the axial blades 13 can form an axial blade assembly. Both the axial blade assembly and the radial blade assembly can be arranged point-symmetrically around a center point of the fan wheel, the center point being defined by the intersection of the axis of rotation 11 with a plane of rotation in which the fan wheel rotates when it rotates about the axis of rotation 11.Due to the point symmetry of the radial and axial blade assembly with respect to the center point, which can be a pivot point of the fan wheel, the advantage arises that no imbalances occur during operation of the fan, i.e., when the fan wheel rotates, as a result of the centrifugal force occurring during rotation. As in . Fig. As shown in Figure 2, the axial blades 13 can be inclined or angled, i.e., exhibit an inclination to the plane of rotation. "Inclined or angled" here can mean that an axial blade 13 can be rotated about a longitudinal axis or central axis running along its body contour, which can be perpendicular to the axis of rotation 11 and point radially outwards. For a given angle of the axial blades 13, as shown in Figure 2, the axial blades 13 can be tilted or angled. Fig. As shown in Figure 2, a rotational direction of the fan wheel results in an axial direction 12, in which air is conveyed axially by the axial blade assembly. For the in Fig. In the axial direction 12 shown in Figure 2, in which air is to be conveyed, a clockwise rotation (when viewed in the direction of the indicated axial direction 12) of the impeller may be necessary. A front face of the impeller can be defined as being located in axial direction 12 in front of or upstream of a rear face of the impeller or fan. The front face may have a surface in its inner region from which the radial blades 14 extend perpendicularly or parallel to the axis of rotation 11, either upstream or upstream. The radial blades 14 may be directly connected to the surface by material, frictional, and / or form-fitting means. The rear face of the impeller or fan may be located downstream of the front face along the axial direction 12 or along the axis of rotation 11.From the rear side, a shaft or drive shaft can extend in axial direction 12, via which, for example, an electric motor can be used to drive and rotate the fan wheel. Each axial blade 13 can have a root region 19. The root region 19 can connect each axial blade 13 directly to the inner region by means of a material, force-fit, and / or form-fit connection. The root region 19 can be directly connected to the surface at one end by means of a material, force-fit, and / or form-fit connection, and at the other end to a radial blade 14. The root region 19 can extend from the surface over the height of the respective radial blade 14, i.e., its extension away from the surface in the opposite direction to the axial direction 12.In particular, each root section 19 can be directly connected to a radial blade 14 by a material, force-fit, and / or form-fit connection. This allows a gap to form between the surface and the root section 19, through which air can flow radially outwards. Because each root section 19 extends from its first end to its second end away from the surface in the opposite direction 12, each axial blade 13 can be simultaneously angled. Preferably, the fan wheel has the same number of axial blades 13 and radial blades 14. During clockwise rotation, viewed in the axial direction 12, air can be conveyed radially outwards from the inner area through the radial blade assembly. Each radial blade 14 can have a pressure side and a suction side.These two sides can be characterized by the fact that their respective surface normals are perpendicular to the axis of rotation, the axial direction 12, or to a direction of elevation of a respective radial blade away from the surface. The pressure side can be the side that, contrary to the direction of rotation of the fan wheel, precedes the suction side. Thus, air can be compressed or pushed on the pressure side, and drawn or sucked in on the suction side. As in . Fig. As shown in Figure 2, a radial blade 14 can convey air, which is conveyed radially outwards along its pressure side, axially in front of an axial blade 13 and simultaneously behind an axial blade 13 that is closest in the direction of rotation. This offers the advantage that the air conveyed radially outwards from the inner area is supplied uniformly to the axial blade assembly, thus reducing disruptive and efficiency-reducing air turbulence. The radial blade assembly offers the advantage that air which would otherwise accumulate in or on the inner area—and which, because there are no axial blades there and / or the inner area is airtight, could not be conveyed axially—can be fed into the axial airflow and thus additionally conveyed axially.In other words, the advantage of the radial blade assembly can be that it increases the airflow conveyed in the axial direction 12 and by the fan overall. This can be particularly advantageous when a maximum airflow rate is required within a given dimension, for example, determined by the installation area. The fan wheel or the axial blade assembly can be surrounded radially on the outside by a fan shroud 15. As shown in . Fig. As shown in Figure 2, the fan shroud 15 can be rotationally symmetrical about the axis of rotation 11. The axial airflow can be directed or guided by the fan shroud 15. This minimizes flow losses, such as those caused by air turbulence at the outer ends of the axial blades 13. This increases the fan's efficiency. The fan wheel and the fan shroud 15 can be made of plastic (GRP, CFRP, fiberglass, and / or metal). In particular, the fan can be manufactured from plastic using a 3D printing process. The shape of the radial blades 14 and the shape and / or inclination of the axial blades 13 can be determined by a person skilled in the art such that the airflow conveyed in the axial direction 12 is maximized for a given drive power and fan dimensions.It can be particularly advantageous if a surface tangent pointing radially outwards at a radially outer end of each radial blade 14 extends collinearly or parallel to a surface tangent along a radially outwards extending side edge of an axial blade 13 immediately adjacent to the respective radial blade 14. In particular, this refers to the respective side edge of the respective axial blade 13 that, contrary to the intended direction of rotation, precedes a second side edge of the respective axial blade 13.

[0037] Fig. Figure 3 shows another embodiment of the fan. In this embodiment, four axial blades 13 can form the axial blade assembly, and four radial blades 14 can form the radial blade assembly. The axial blades 13 and the radial blades 14 can be arranged symmetrically around the center point or pivot point. Preferably, the pivot point is located in the inner region. Fig. Figure 3 shows a schematic frontal view looking in the axial direction 12 or in the axial airflow direction towards the front. Upstream of the surface and obstructed by the surface, an intake element 16 can extend upstream and perpendicular to the surface. The intake element 16 can be held by at least one strut 17, i.e., by one or more struts 17. As shown in Fig. As shown in Figure 3, the intake element 16 can be held in position or attached by three struts 17. Each strut can be designed as a rod, i.e., have a geometry in which a first dimension in a first direction of extension is a multiple, in particular three to ten times, of the second and third dimensions in a second and third direction of extension, respectively, the second and third directions of extension being defined perpendicular to the first direction of extension. At a first radially inner end, each strut 17 can be directly connected to a wall of the intake element 16 by a material, force-fit, and / or form-fit connection. At a radially outer second end, each strut 17 can be directly connected to the fan frame 15 by a material, force-fit, and / or form-fit connection.The fan housing 15 can be rigid or non-rotatable, so that the housing cannot rotate in the direction of rotation when the fan wheel rotates about the axis of rotation 11. In this case, the intake element 16, which may be connected to the fan housing 15 via the struts 17, cannot be rotatable. In particular, in this case, the intake element 16 is not directly connected to the fan wheel by material, force-fit, and / or form-fit. The intake element 16 can divide the airflow approaching the front of the fan or fan wheel from the axial direction 12. The intake element 16 can be, as in . Fig. As shown in Figure 3, the intake element 16 is rotationally symmetrical about the axis of rotation 11 and its wall separates a radially inner region from a radially outer region. The wall of the intake element 16 can be spaced from a boundary region that separates the radial blade assembly from the axial blade assembly and extend perpendicularly upwards from the surface. This allows the incoming airflow to be divided into an inner and an outer airflow. The inner airflow can be directed to the radial blade assembly, and the outer airflow can be directed to the axial blade assembly. By separating the incoming airflow, efficiency-reducing air turbulence between the airflow that is to be conveyed axially only by the axial blade assembly and the airflow that is to be directed radially outwards to the axial blade assembly by the radial blade assembly can be reduced.Additionally or alternatively, it can be provided that at least one strut 17 is designed as an air guide element and is equipped, for example, by means of a wing profile, to guide and / or align the oncoming air in the axial direction 12.

[0038] Fig. Figure 4 shows a schematic perspective view of the fan with a transparent intake element 16. In this embodiment, the intake element 16 can be attached to the non-rotating fan frame 15 by means of three struts 17. The intake element 16 is therefore not connected to the fan wheel. The intake element 16 can be tubular or rotationally symmetrical about the axis of rotation 11 and extend upstream from the surface of the inner region. The tubular intake element 16 can have an upstream end or end plane that includes or represents an air inlet opening. "Air inlet opening" here refers to a surface bounded by the wall of the intake element at the upstream left end and aligned parallel to the surface of the inner region or to the plane of rotation. A wall region that borders or bounds the air inlet opening can have a chamfer 18.Chamfer 18 refers to a beveling of the wall area running all the way around the air intake opening. Fig. Figure 4 shows the chamfer 18 as a slope running radially outwards in the axial direction 12 around the entire wall area. The chamfer 18 reduces the area of ​​stagnation, i.e., the portion of the wall area that surrounds the air inlet opening and is perpendicular to the axial direction, causing the incoming air to stagnate there. This reduces efficiency-reducing flow losses during the flow through and / or around the intake element 16 compared to a wall area around the air inlet opening that is neither chamfered nor beveled. The chamfer 18 can extend radially outwards from the air inlet opening in the axial direction 12, as shown in Fig. 4 shown, or it can extend radially downwards inwards. Which embodiment of the chamfer 18 is more aerodynamically efficient or increases efficiency can be determined by a person skilled in the art based on test series or CFD analyses (CFD: computational fluid dynamics). A gap can form between the surface and the intake element 16, which is not connected to the surface. This gap can represent an outflow area through which air conveyed radially outwards by the radial blade assembly can be supplied to or flow into the axial blade assembly. Fig. 5. Another schematic perspective view of the fan is shown. This means that when the fan is operating, i.e., when the fan wheel rotates around the axis of rotation 11, air can flow radially outwards through this gap. Here, the intake element 16 with the chamfer 18 is shown as opaque.

[0039] In Fig. Figure 5 shows how each axial blade 13 extends along its respective root region 19 from the surface towards the intake element 16 and thus across the gap or outflow area. An axial blade 13 can be connected at one end of its root region 19 to the surface and simultaneously to the lower end of a first radial blade. At the other end of its root region 19, the axial blade can be connected to the upper surface of a second radial blade 14. The first radial blade can thus convey the air it conveys through the gap in a radial direction and axially in front of this axial blade, while the second radial blade conveys the air it conveys radially in an axial direction and in front of this axial blade.In conjunction with flow guidance through the intake element 16, air turbulence causing flow losses can thus be reduced, compared to conventional fans.

[0040] In a possible installation area 10 in a motor vehicle, the fan can be held by a housing or a frame. In particular, the frame can hold the fan wheel, the fan shroud 15, the intake element 16 and / or the drive, each and / or all together, in the respective relative position or positions to each other, as described above.

[0041] The following describes a particularly preferred embodiment.

[0042] The following technical problem can be solved: Fan impellers, for example those used in automotive cooling systems, are typically enclosed in a central area, also known as the inner area, because the drive mechanism, which may be an electric motor, is located behind it. This can result in a significant percentage of the effective airflow being lost, leading to less efficient operation of the cooling fan.

[0043] This embodiment demonstrates how the situation described above can be resolved. The following devices or fans are known from the prior art and may have disadvantages: - Axial fan - Radial fan - Air guide elements

[0044] The following arrangement for a fan wheel can avoid the disadvantages known from this and provides for the effective use of airflow that is unusable in conventionally designed fan wheels. The unusable airflow here refers to the area flowing towards or impacting the inner, axially impervious area 12. In conventionally designed fan wheels, the central area is usually completely covered (circularly), so that an airflow drawn in from the front cannot be used in a flow-optimized or efficient manner. In the new arrangement, the novel design of a fan wheel can be located behind a stationary intake tube, which can also be referred to as an intake element 16. This intake element can be connected, for example, by corresponding struts 17 to an outer, annular air guide element, which can be the fan shroud 15.This fan wheel is characterized in particular by the fact that it represents a combination of a radial air guide, which can also be referred to as a radial blade assembly, and an axial air guide, which can also be referred to as an axial blade assembly. In the figures... Fig. 2, Fig. 3, Fig. 4 to Fig.For the sake of simplicity, figure 5 is a fan wheel with 4 air-guiding elements each, i.e., four axial blades 13 for the axial blade assembly and four radial blades 14 for the radial blade assembly - both in the radial and axial air guidance units, which can also be referred to as axial blade assembly and radial blade assembly respectively.A design, for example of a fan and / or fan wheel, can be characterized in particular by the fact that the axially acting air guide elements, which can also be referred to as axial blades 13, are arranged such that the air expelled or radially conveyed by the radial air guide elements, which can also be referred to as radial blades 14, is guided both in front of and behind the respective axial air guide element, or can be supplied to the axial blade 13 both in front of and behind the respective axial blade 13 in the axial direction 12. This can lead to a particularly efficient use of the intake airflow and thus also to a correspondingly larger volume of air flowing through it per unit of time compared to a fan wheel of conventional design. The drive (for example, an electric motor) can be arranged behind the fan wheel assembly, which can also be referred to as a fan.During the design phase, the dimensions of this drive should form the basis for the dimensioning of the new fan wheel or the inner area. The diameter of the radial air guide unit, which can also be referred to as a radial blade assembly, should completely cover the dimensions of the drive or have a larger diameter in the radial direction than a maximum transverse dimension perpendicular to the axial direction 12. The percentage of the cross-sectional area of ​​the radial air guide unit is then distributed accordingly to the percentage of the axial air guide unit, which can also be referred to as an axial blade assembly, or can be supplied to the axially conveyed airflow.

[0045] Overall, the examples show how a fan wheel for a motor vehicle fan, a motor vehicle fan, and a motor vehicle with a fan can be provided.

Claims

[1] Fan wheel for a motor vehicle fan, with at least one axial blade (13) by means of which air is conveyed in the axial direction (12) of the fan wheel by rotating the fan wheel about an axis of rotation (11), wherein the fan wheel has at least one radial blade (14) in a region adjoining the axial blade (13) in the radial direction of the fan wheel, by means of which air is conveyed outwards in the radial direction of the fan wheel by rotating the fan wheel about the axis of rotation (11), characterized by , that: - the at least one axial blade (13) forms an axial blade assembly by means of which the air is conveyed in the axial direction (12) of the fan wheel by rotating the fan wheel about the axis of rotation (11); - the at least one radial blade (14) forms a radial blade assembly by means of which, by rotating the fan wheel about the axis of rotation (11), the air is conveyed outwards in the radial direction of the fan wheel; and - via an outflow area of ​​the radial blade assembly, when the fan wheel is rotated about the axis of rotation (11), the air conveyed by means of the radial blade assembly flows outwards in the radial direction of the fan wheel in the axial direction (12) of the fan wheel, partly in front of the axial blade assembly and partly behind the axial blade assembly. [2] Fan for a motor vehicle with a fan wheel which has at least one axial blade (13) by means of which air is conveyed in the axial direction (12) of the fan wheel by rotating the fan wheel about an axis of rotation (11), characterized by, that the fan wheel has at least one radial blade (14) in a region adjoining the axial blade (13) in a radial direction of the fan wheel, by means of which the air is conveyed outwards in a radial direction of the fan wheel by rotating the fan wheel about the axis of rotation (11). [3] Fan according to claim 2, characterized by , that the fan has an intake element (16) adjoining an inner area in the axial direction (12) of the fan wheel and through which air can flow in the axial direction (12) of the fan wheel, via which the at least one radial blade (14) can be supplied with air. [4] Fan according to claim 3, characterized by, that the at least one radial blade (14) extends from a surface having the inner region in the axial direction (12) of the fan wheel away from the intake element (16), wherein the intake element (16) is spaced away from the surface, whereby a gap through which flow can occur in the radial direction of the fan wheel is formed between the surface and the intake element (16). [5] Fan according to claim 4, characterized by , that a root area (19) of the at least one axial blade (13) extends from the inner area in a radial direction of the fan wheel outwards from the surface towards the intake element (16) and thus at least partially across the gap. [6] Fan according to any one of claims 3 to 5, characterized by , that a wall area by which an air inlet opening of the intake element (16) is enclosed has a chamfer (18). [7] Fan according to any one of claims 3 to 6, characterized by, that the fan has a fan frame (15) in an area extending outwards in the radial direction of the fan wheel to the at least one axial blade (13), which surrounds the fan wheel in the circumferential direction. [8] Fan according to one of claims 3 to 6 and according to claim 7, characterized by , that the intake element (16) is held attached to the fan frame (15) by means of at least one strut (16). [9] Motor vehicle with a fan according to any one of claims 2 to 8.

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