Motor vehicle with axial flux machine aligned parallel to the vertical axis

Abstract

The invention relates to a motor vehicle (KFZ) comprising a traction drive (TA) with an axial flux machine (AFM) having a rotational axis (DA), wherein the axial flux machine (AFM) is arranged in the motor vehicle (KFZ) such that the rotational axis (DA) is aligned parallel to a vertical axis (HA) and / or in the direction of the vertical axis (HA) of the motor vehicle (KFZ).

Description

[0001] The invention relates to an at least partially electrically driven motor vehicle having a traction drive with an axial flux machine, wherein the axial flux machine has an axis of rotation, and the axis of rotation is aligned parallel to a vertical axis of the motor vehicle.

[0002] Motor vehicles with a traction drive are generally known. Furthermore, it is known that traction drives comprise an axial flux machine. Axial flux machines generally comprise a disk-shaped rotor and a disk-shaped stator arranged parallel to the disk-shaped rotor. In known axial flux machines, a rotor rotation axis is aligned in the direction of or parallel to a transverse axis of the motor vehicle in order to transfer the rotary motion of the rotor directly to the wheels of the motor vehicle. Since the installation space for the traction drive in motor vehicles is limited in the direction of a vertical axis of the motor vehicle, known axial flux machines have a reduced diameter. This means that the known axial flux machines can have reduced torque.

[0003] An object of the invention is to provide a motor vehicle with a traction drive having an axial flux machine, wherein the axial flux machine can be arranged in a space-saving manner and can have an increased power.

[0004] The problem is solved by the subject matter of the independent patent claim. Preferred developments of the invention are the subject matter of the dependent patent claims, the following description, and the drawings. Each feature can represent an aspect of the invention, both individually and in combination, unless explicitly stated otherwise in the description.

[0005] In a first aspect, the invention relates to a motor vehicle having a traction drive with an axial flux machine having a rotational axis, wherein the axial flux machine is arranged in the motor vehicle such that the rotational axis is aligned parallel to a vertical axis and / or in the direction of the vertical axis of the motor vehicle.

[0006] In other words, according to the first aspect of the invention, a motor vehicle is provided. The motor vehicle generally has a longitudinal axis. The longitudinal axis is preferably aligned in a direction of travel of the motor vehicle and extends from a front of the motor vehicle to a rear of the motor vehicle. In addition, the motor vehicle generally has a transverse axis. The transverse axis is aligned at a right angle to the longitudinal axis of the motor vehicle and preferably extends between the two sides of the motor vehicle that are arranged at a distance from one another. Furthermore, the motor vehicle comprises a vertical axis. The vertical axis is aligned both at a right angle to the longitudinal axis and at a right angle to the transverse axis of the motor vehicle. The vertical axis points towards the sky when the motor vehicle is on a level surface. Furthermore, the motor vehicle is provided with a traction drive.The traction drive comprises an axial flux machine. The axial flux machine, in turn, comprises an axis of rotation. The axis of rotation is preferably an axis of a rotor arranged in the axial flux machine. According to the invention, it is now provided that the axis of rotation is aligned parallel to the vertical axis and / or in the direction of the vertical axis of the motor vehicle. The arrangement of the axial flux machine in the motor vehicle thus has a completely new arrangement compared to the known prior art. Due to the new arrangement of the axial flux machine in the motor vehicle such that the axis of rotation is aligned towards the vertical axis of the motor vehicle, on the one hand the axial flux machine and thus also the rotor and / or stator arranged in the axial flux machine can have a larger diameter, and on the other hand the installation space of the axial flux machine in the direction of the vertical axis of the motor vehicle can be reduced. With a larger outer diameter of the axial flux machine orof the rotor and / or stator arranged in the axial flux machine, the torque and thus also the performance of the axial flux machine can be increased.

[0007] An advantageous development of the invention is that the motor vehicle has at least two wheels arranged at a distance from one another and mounted for rotation about a wheel axis, wherein the axial flux machine is arranged, on the one hand, between the two wheels and, on the other hand, between the wheel axis and a wheel contact point of the wheels. Consequently, the motor vehicle has two wheels, which are preferably arranged at a distance from one another in the transverse direction or in the direction of the transverse axis of the motor vehicle. Furthermore, the wheels have a wheel axis around which the wheels rotate.

[0008] The wheels usually rest on a contact patch. The point at which the wheels rest on the contact patch is the wheel contact point. The axial flux machine is located between the wheel axle and the contact patch. It goes without saying that, due to the required ground clearance, the axial flux machine maintains a minimum distance from the contact patch. The axial flux machine is therefore located in an area that, when the vehicle rests on the contact patch, is below the wheel axle. This allows the area above the wheel axle to be used as a trunk or storage space.In this way, a motor vehicle is provided in which the axial flux machine is arranged in a region in which the axial flux machine can, on the one hand, have an increased outer diameter, which can have an advantageous effect on the torque and the performance of the axial flux machine, and, on the other hand, does not take up any installation space above the wheel axle, so that this space can be used for other purposes.

[0009] In this context, an advantageous embodiment of the invention is that the axial flux machine is arranged between the wheel axle and half the wheel radius. In other words, a certain minimum distance of the axial flux machine from the contact point of the wheels on the contact surface is specified. This minimum distance is therefore at least half the wheel radius. This specifies a ground clearance for the axial flux machine relative to the contact point of the wheels.

[0010] According to an advantageous development of the invention, the rotational axis of the axial flux machine intersects a longitudinal axis of the motor vehicle. In other words, the axial flux machine is arranged centrally relative to the transverse direction of the motor vehicle. This has the advantage that the weight of the axial flux machine can be evenly distributed.

[0011] A preferred embodiment of the invention is that a rotor shaft of the axial flux machine is mechanically coupled to a bevel gear, and via the bevel gear, a rotation of the rotor shaft about the vertical axis can be converted into a rotary movement about the transverse axis of the motor vehicle. Thus, via the bevel gear, the rotary movement of the rotor shaft, which occurs about the rotational axis, can be easily converted into a rotary movement about the transverse axis for transmission to the wheels.

[0012] In this context, an advantageous development of the invention is that a differential gear is mechanically connected to the bevel gear. The differential gear can be used to compensate for the rotational speed between the two spaced-apart wheels of a wheel axle.

[0013] According to a preferred embodiment of the invention, it is provided that for an outer diameter Ø AD of a rotor of the axial flux machine applies: 20 cm ≤ Ø AD ≤ 50 cm, preferably 25 cm ≤ Ø AD ≤ 45 cm, particularly preferred 30 cm ≤ Ø AD ≤ 45 cm. The axial flow machines thus have a larger diameter than the current state of the art. Due to the increased outer diameter of the rotor, the axial flow machines can achieve increased performance.

[0014] The traction drive can preferably be a component of a front axle and / or rear axle of the motor vehicle.

[0015] Further features and advantages of the present invention emerge from the dependent claims and the following exemplary embodiment. The exemplary embodiment is not restrictive, but rather should be understood as an example. It is intended to enable those skilled in the art to implement the invention. The applicant reserves the right to make individual and / or several of the features disclosed in the exemplary embodiment the subject of patent claims or to incorporate such features into existing patent claims. The exemplary embodiment is explained in more detail with reference to drawings.

[0016] In these show: Fig. 1 a three-dimensional view of a motor vehicle, Fig. 2 a view of a traction drive of the motor vehicle.

[0017] In Fig. 1 shows a three-dimensional view of a motor vehicle KFZ. The motor vehicle KFZ generally has a longitudinal axis LA. The longitudinal axis LA is preferably aligned in a direction of travel of the motor vehicle KFZ, or extends from a front of the motor vehicle KFZ to a rear of the motor vehicle KFZ. In addition, the motor vehicle KFZ has a transverse axis QA. The transverse axis QA is aligned at a right angle to the longitudinal axis LA of the motor vehicle KFZ and preferably extends between the two sides of the motor vehicle KFZ that are arranged at a distance from one another. Furthermore, the motor vehicle comprises a vertical axis HA. The vertical axis HA is aligned both at a right angle to the longitudinal axis LA and at a right angle to the transverse axis QA of the motor vehicle KFZ. The vertical axis HA preferably points towards the sky, provided the motor vehicle KFZ is standing on a flat surface.

[0018] The motor vehicle KFZ has a traction drive TA, as shown in a view in Fig. 2 is shown schematically. The traction drive TA comprises an axial flux machine AFM. The axial flux machine AFM in turn comprises a rotational axis DA. The rotational axis DA is preferably an axis of a rotor arranged in the axial flux machine AFM. According to the invention, it is now provided that the rotational axis DA is aligned parallel to the vertical axis HA and / or in the direction of the vertical axis HA of the motor vehicle KFZ. By arranging the axial flux machine AFM in the motor vehicle KFZ in such a way that the rotational axis DA is aligned in the direction of the vertical axis HA of the motor vehicle KFZ, on the one hand the axial flux machine AFM and thus also the rotor and / or stator arranged in the axial flux machine AFM can have a larger outer diameter, and on the other hand the axial flux machine AFM can have a reduced installation space in the direction of the vertical axis HA of the motor vehicle KFZ. With a larger outer diameter of the axial flux machine AFM orof the rotor and / or stator arranged in the axial flux machine AFM, the torque and thus also the performance of the axial flux machine AFM can be increased.

[0019] The Fig. 2, it can also be seen that the motor vehicle FKZ has at least two wheels RD arranged at a distance from one another and mounted rotatably about a wheel axis RA, wherein the axial flux machine AFM is arranged on the one hand between the two wheels RD and on the other hand between the wheel axis RA and a wheel contact point RAP of the wheels RD. The wheel contact point RAP is the point at which the wheels RD normally rest on a contact surface. In particular, it is provided, even if not explicitly stated in the Fig. 2 shows that the axial flux machine AFM is located between the wheel axis RA and half a wheel radius (1 / 2 r RD) of the RD wheels. In other words, a certain minimum distance of the axial flux machine AFM from the wheel contact point RAP of the RD wheels in the direction of the vertical axis HA is specified. This minimum distance is therefore at least half the wheel radius. This specifies a ground clearance for the axial flux machine AFM relative to the wheel contact point RAP of the RD wheels.

[0020] If the axial flux machine AFM is arranged below the wheel axis RA, i.e. in an area between the wheel axis RA and the wheel contact point RAP, and in addition a rotational axis DA of the axial flux machine AFM is aligned in the direction of the vertical axis HA of the motor vehicle KFZ, an increase in the outer diameter of the axial flux machine AFM or of the stator and rotor has no or only a reduced influence on the installation space of the axial flux machine AFM in the direction of the vertical axis HA of the motor vehicle KFZ.

[0021] The rotational axis DA of the axial flux machine AFM preferably intersects the longitudinal axis LA of the motor vehicle KFZ. In other words, the axial flux machine AFM is arranged centrally relative to the transverse direction of the motor vehicle KFZ. This has the advantage that the weight of the axial flux machine AFM can be evenly distributed.

[0022] A rotor shaft of the axial flux machine AFM is mechanically coupled to a bevel gear KRG, so that the rotation of the rotor shaft RW, which extends in the direction of the vertical axis HA, can be converted into a rotary motion about the transverse axis QA of the motor vehicle KFZ via the bevel gear KRG. The rotary motion of the rotor shaft, which occurs about the rotational axis DA, can be easily converted into a rotary motion about the transverse axis QA for transmission to the wheels RD via the bevel gear KRG.

[0023] Furthermore, a differential gear DG is mechanically coupled to the bevel gear KRG. The differential gear DG can be used to balance the speed between the two spaced-apart wheels RD of a wheel axle RA. Starting from the differential gear DG, the generated rotational movement is transmitted to the wheels RD via the steering knuckle AS.

Claims

[1] Motor vehicle (KFZ), comprising a traction drive (TA) with an axial flux machine (AFM) having a rotational axis (DA), wherein the axial flux machine (AFM) is arranged in the motor vehicle (KFZ) such that the rotational axis (DA) is aligned parallel to a vertical axis (HA) and / or in the direction of the vertical axis (HA) of the motor vehicle (KFZ). [2] Motor vehicle according to claim 1, comprising at least two wheels (RD) arranged at a distance from one another and mounted rotatably about a wheel axis (RA), wherein the axial flux machine (AFM) is arranged on the one hand between the two wheels (RD) and on the other hand between the wheel axis (RA) and a wheel contact point (RAP) of the wheels (RD). [3] Motor vehicle according to claim 2, characterized by that the axial flux machine (AFM) is located between the wheel axis (RA) and half a wheel radius (1 / 2 r RD ) of the wheels (RD). [4] Motor vehicle according to one of the preceding claims, characterized bythat the axis of rotation (DA) of the axial flux machine (AFM) crosses a longitudinal axis (LA) of the motor vehicle (KFZ). [5] Motor vehicle according to one of the preceding claims, characterized by , a rotor shaft of the axial flux machine (AFM) is mechanically coupled to a bevel gear (KRG), and via the bevel gear (KRG) a rotation of the rotor shaft about the vertical axis (HA) can be converted into a rotary movement about a transverse axis (QA) of the motor vehicle (KFZ). [6] Motor vehicle according to claim 5, characterized by that a differential gear (DG) is mechanically connected to the bevel gear (KRG). [7] Motor vehicle according to one of the preceding claims, characterized by that for an outer diameter Ø AD of a rotor of the axial flux machine (AFM) applies: 20 cm ≤ Ø AD ≤ 50 cm.

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