Functional body arrangement, rotor arrangement and electrical machine

Abstract

The invention relates to a functional body arrangement (1) for an electric machine (100) with a rotor (51) and a shaft (70) with a common axis of rotation (R), which is designed to be arranged in an installation position between an inner surface (53) of the rotor (51) and an outer surface (71) of the shaft (70), wherein the functional body arrangement (1) comprises a first body element (3) with a first guide section (3a) and a second body element (5) with a second guide section (5a), which can each be coupled to one another slidably via the two guide sections (3a, 5a) along a longitudinal axis (L), and wherein the functional body arrangement (1) has a lower height (H) transverse to the longitudinal axis (L) in a first position (O) along the longitudinal axis (L) than in a second position (F).The invention further relates to a rotor arrangement (50) with the functional body arrangement (1) according to the invention and to an electric machine (100) with the rotor arrangement and the functional body arrangement (1) according to the invention.

Description

[0001] The present invention generally relates to a functional body arrangement, a rotor arrangement and an electrical machine.

[0002] Spacers for electrical machines are commonly used; they are arranged between a shaft and a rotor. Metallic material is removed from a rotor core to create the spacers. Functional elements in the form of spacers, whose density is lower than that of the rotor core, are inserted into the resulting cavity. The spacers are made of a soft plastic, for example.

[0003] The spacers can perform various functions within the electric motor. For example, they reduce the weight of the rotor. Due to the moving masses on the rotor and the very high speeds during operation, even small weight reductions can have a significant impact, contributing to increasing the vehicle's efficiency. The rotor often needs to be actively cooled during operation to ensure the electric motor remains efficient even during continuous use. By inserting spacers between the shaft and the rotor, the surface area of ​​the rotor is increased and the required oil volume is reduced. This allows the rotor to be cooled more efficiently.

[0004] However, it is difficult to install the delicate spacers correctly. The high operating speeds and the higher coefficient of expansion of the rotor core mean that the spacers must be installed using a press fit. This ensures that the spacers cannot move during operation.

[0005] However, a press fit has several disadvantages. During assembly, the rotor and the spacer must be kept at different temperatures to allow the spacer to be inserted. For example, the spacer can be shrunk at low temperatures and installed in this shrunk state. However, this makes the assembly process complex and expensive.

[0006] Another approach to assembly is to mechanically press the spacers axially. However, this leads to several disadvantages. The laminated core consists of a layered structure with laminations that have sharp edges on their surfaces. Sliding the spacer over the sharp edges of the laminations can cause damage, especially if the spacers are made of soft plastic. Furthermore, axial pressing can damage the end faces of the spacers, making precise positioning only possible to a limited extent. This can negatively impact the cooling performance of the rotor.

[0007] Both installation options require a lot of time, energy and additional tools.

[0008] The object of the present invention is therefore to provide a functional body arrangement, a rotor arrangement and an electrical machine in which the disadvantages mentioned above are at least partially reduced.

[0009] This object is achieved by a functional body arrangement according to claim 1, a rotor arrangement according to claim 12 and an electrical machine according to claim 15.

[0010] Further aspects and features of the present invention emerge from the dependent claims, the accompanying drawings and the following description of embodiments.

[0011] According to a first aspect, the present invention provides a functional body arrangement for an electrical machine having a rotor and a shaft, with a common axis of rotation, which is designed to be arranged in an installed position between an inner circumferential surface of the rotor and an outer circumferential surface of the shaft, wherein the functional body arrangement comprises a first body element with a first guide section and a second body element with a second guide section, which can each be coupled to one another displaceably along a longitudinal axis via the two guide sections, and the functional body arrangement has a lower height transverse to the longitudinal axis in a first position along a longitudinal axis than in a second position.

[0012] The functional body assembly can be a displacement body assembly. The first position can be an assembly position. In the assembly position, the functional body assembly can be inserted between the inner surface of the rotor and the outer surface of the shaft. In the assembly position, the functional body assembly can be inserted between the inner surface of the rotor and the outer surface of the shaft in an essentially contactless manner. Essentially contactless can mean without friction between the functional body assembly and the inner surface.

[0013] The first body element and the second body element can be designed identically. This can reduce production costs. This can increase the number of identical parts. A cross-sectional contour of the functional body arrangement 1 can have a vertical plane of symmetry. The cross-sectional contour of the functional body arrangement 1 can have a horizontal plane of symmetry. The cross-sectional contour of the functional body arrangement 1 can have the vertical and horizontal planes of symmetry. The cross-sectional contour can be an outline contour of the functional body arrangement 1.

[0014] The guide sections can be configured such that the first body element and the second body element are guided against a displacement direction transverse to the longitudinal axis. The first guide section can comprise a male and a female section. The second guide section can comprise a male and a female section. The first and second body elements can be detachably coupled to one another. The first and second body elements can be non-detachably coupled to one another.

[0015] The height transverse to the longitudinal axis can be a height in a radial direction relative to the rotation axis. The movable coupling along the longitudinal axis allows the functional body assembly to be pressed between the rotor and the shaft. The functional body assembly can be pressed between the rotor and the shaft without the functional body assembly being damaged by the inner surface of the rotor.

[0016] Before a detailed description of the figures, general remarks on the embodiments follow.

[0017] There are embodiments in which the height transverse to the longitudinal axis of the functional body arrangement can be changed in a geometric relationship to the displacement along the longitudinal axis of the first and second body elements relative to one another.

[0018] The height of the functional body arrangement can increase the closer the first and second body elements are pushed together along the longitudinal axis. The height of the functional body arrangement can decrease the further the first and second body elements are pushed apart along the longitudinal axis.

[0019] The first body element and the second body element can each have an inclined side surface. The inclined side surface can be aligned obliquely or diagonally with respect to the longitudinal axis. The first body element and the second body element can contact each other via the inclined side surfaces. The first body element and the second body element can lie on one another via the inclined side surfaces. The first guide section can be formed on the inclined side surface of the first body element. The second guide section can be formed on the inclined side surface of the second body element. A pitch angle of the inclined side surface of the first body element and a pitch angle of the inclined side surface of the second body element can together add up to 90°.Due to the common pitch angle of 90°, the side surfaces of the functional body arrangement, which are aligned with the two lateral surfaces of the rotor and the shaft, can be aligned parallel to each other.

[0020] There are embodiments in which the functional body arrangement is designed such that in the installed position in the second position the first body element contacts a receiving recess of the inner circumferential surface of the rotor and the second body element contacts the outer circumferential surface of the shaft.

[0021] In the second position, the functional body assembly can be pressed between the inner surface of the rotor and the outer surface. In the second position, the functional body assembly can also have a centering function for the rotor and the shaft.

[0022] There are embodiments in which the first body element and / or the second body element is wedge-shaped. The first body element can have a triangular cross-section. The second body element can have a triangular cross-section. The triangular cross-section can be a cross-section that runs along the longitudinal axis. The wedge-shaped first body element and the wedge-shaped second body element can contact each other along the guide sections in such a way that the side surface or contact surface of the first body element towards the rotor and the side surface or contact surface of the second body element towards the shaft are aligned parallel to each other. This allows the functional body arrangement to be clamped between the rotor and the shaft.

[0023] There are embodiments in which the first body element comprises a web arrangement and / or the second body element comprises a web arrangement.

[0024] The web arrangement can run along the longitudinal axis. The web arrangement can be arranged on an outer surface or lateral surface of the first body element. The web arrangement can be arranged on an outer surface or lateral surface of the second body element. The web arrangement can be arranged offset on an outer surface or lateral surface. The web arrangement can be arranged mounted on an outer surface or lateral surface. The web arrangement can comprise one web. The web arrangement can comprise several webs. The webs can run parallel to one another.

[0025] There are embodiments in which the web arrangement is designed to form a channel arrangement between the inner circumferential surface of the rotor and the functional body arrangement.

[0026] The first web arrangement can be configured to form the channel arrangement between the inner surface of the rotor and the functional body arrangement. The second web arrangement can be configured to form the channel arrangement between the inner surface of the rotor and the functional body arrangement. The first and second web arrangements can be configured to jointly form the channel arrangement between the inner surface of the rotor and the functional body arrangement.

[0027] The web arrangement can be designed to divide the channel arrangement into individual channels. The web arrangement can comprise a plurality of webs. The channel arrangement can comprise a plurality of channels. The webs can divide the channel arrangement into a plurality of channels. A cross-section of a channel can be formed by one or more webs, a section of the inner circumferential surface of the rotor and a surface or circumferential surface of the first and / or the second body element. The channel arrangement can be designed to conduct a fluid. The channel arrangement can run along the longitudinal axis. The channel arrangement can be relatively flat. The channel arrangement can be relatively wide. The channel arrangement can be designed such that the largest possible surface area is spanned. A large surface area can increase the cooling performance.The channel arrangement can be designed to achieve a high fluid flow velocity. A high fluid flow velocity can increase cooling performance, thereby reducing drag losses.

[0028] There are embodiments in which the functional body arrangement is designed as a displacement body, and a fluid can be distributed in a defined manner along the surface of the functional body arrangement between the rotor and the shaft.

[0029] The functional body arrangement or the displacement body can be designed to reduce the volume between the inner surface of the rotor and the outer surface of the shaft. The displacement body can be designed to displace a fluid. The displacement body can reduce the total fluid volume between the rotor and the shaft. This can increase the flow velocity of the fluid. This can increase the cooling capacity. This can reduce drag losses.

[0030] The functional body assembly or the displacement body can be made of a material that has a lower density than the rotor. The functional body assembly or the displacement body can be made of a material that has a lower density than the shaft. The functional body assembly or the displacement body can be made of a plastic. The plastic can be any plastic that has sufficient temperature and media resistance. The media resistance can include fluid resistance. The sufficient resistance lies within the range of the requirements profile of the electrical machine. The functional body assembly or the displacement bodies can be manufactured using an injection molding process. The functional body assembly can contribute to reducing the overall weight of the electrical machine.

[0031] The functional body arrangement or the displacement body can be made of a non-conductive material. The functional body arrangement or the displacement body can be made of a magnetically non-conductive material.

[0032] There are embodiments in which the first body element comprises a first spacer on one end face and / or the second body element comprises a second spacer on one end face.

[0033] The spacer and the body element can be designed as a single piece. The spacer and the body element can be designed as multiple pieces. In the installed position, the first spacer and the second spacer can each be arranged on the opposite end face. The spacer can position the body element along the longitudinal axis. The spacer can serve as a positioning aid. The two spacers can position the first body element and the second body element relative to each other in a predefined installation position.

[0034] The spacer can be web-shaped. The spacer can be pin-shaped. The shape of the spacer can be selected taking fluid flow into account. The spacer can be designed to allow the fluid to be distributed evenly in a circumferential direction. The spacer can be designed to form an additional channel arrangement between the functional body arrangement and a fixing part.

[0035] There are embodiments in which, in the installation position in the second position, the first body element can be fixed to the second body element at the front via the functional body arrangement with the fixing part against displacement along the longitudinal axis.

[0036] The fixing part can be a fixing disc. The fixing part can be a balancing disc. The functional body assembly can be designed such that, in the installed position, the functional body assembly contacts the fixing part only via the spacers. The fixing part can serve as an axial stop. The fixing part can serve as an axial stop for positioning the functional body assembly along the longitudinal axis.

[0037] There are embodiments in which, in the second position, the first body element and the second body element can be permanently coupled to one another in a direction along the height transverse to the longitudinal axis.

[0038] The direction along the height transverse to the longitudinal axis can be a vertical direction relative to the functional body arrangement. The first and second body elements can be permanently coupled to one another in a direction along the width transverse to the longitudinal axis.

[0039] The first body element and the second body element can be coupled to one another in a form-fitting manner. The first body element and the second body element can be coupled to one another via a dovetail connection. The dovetail connection can be formed along the guide sections. The dovetail connection can be formed in the region of the two end faces of the functional body arrangement. On the first body element, a male part of the dovetail connection can be formed in the region of one end face, and a female part of the dovetail connection can be formed in the region of the opposite end face. On the second body element, a male part of the dovetail connection can be formed in the region of one end face, and a female part of the dovetail connection can be formed in the region of the opposite end face.

[0040] The first body element and the second body element can already be permanently coupled to each other in a pre-assembly position in the direction along the height transverse to the longitudinal axis. The pre-assembly position can be a position that does not correspond to the position in the installed position. In the pre-assembly position, the functional body arrangement can have a lower height transverse to the longitudinal axis than in the installed position.

[0041] A threading geometry can be formed in a central region of the body element. The threading geometry can be used to thread the male part of the dovetail joint into the central region of the opposing body element. The threading geometry can be a threading surface. The dovetail joint can simplify the assembly of the first and second body elements. The dovetail joint can be used to securely connect the first and second body elements to one another.

[0042] There are embodiments in which the first body element has a first opening and the second body element has a second opening, which form a common opening along the longitudinal axis in the functional body arrangement.

[0043] The first opening may be a through opening. The second opening may be a through opening. The common opening may be a common through opening.

[0044] In another embodiment, the first and second openings can each be closed in the region of an end face. The opening can be designed as a blind hole in the body element. This allows the functional body arrangement to be hollow. The first and second body elements can form a cavity through the shared opening. The cavity can be sealed in a media-tight manner by the first and second body elements.

[0045] The openings allow the weight of the functional body assembly to be reduced. This also reduces the overall weight of the electrical machine. The opening also increases cooling performance.

[0046] A second aspect of the application relates to a rotor assembly with the functional body assembly according to the invention. The functional body assembly is arranged in the region of the inner circumferential surface. The rotor assembly can be a rotor assembly for a permanent-magnet synchronous machine. Magnets can be arranged in the rotor assembly. The rotor assembly can be a rotor assembly for a reluctance motor.

[0047] There are embodiments which further comprise a rotor and a shaft, wherein a receiving recess for receiving the functional body arrangement is formed on an inner circumferential surface of the rotor.

[0048] The rotor may comprise a rotor core. The receiving recess may be formed in the rotor core on the inner surface. The receiving recess allows for the elimination of additional metallic material on the rotor, further reducing weight.

[0049] Due to the layered structure of the rotor core, the inner surface has a rough surface. The functional body assembly can be inserted into the receiving recess in such a way that there is essentially no frictional contact with the rough surface during insertion. This allows the functional body assembly to be brought into the installation position without damage.

[0050] The rotor assembly may further comprise the fixing part. The fixing part may be arranged on the end face of the rotor core. The rotor assembly may comprise a fixing part on both end faces of the rotor core.

[0051] One possible way to assemble the functional body assembly is described below as an example. The functional body assembly is in the pre-assembly position before being inserted between the rotor and the shaft. Alternatively, the first body element can be inserted between the rotor and the shaft, followed by the second body element.

[0052] The first fixing part is mounted on one end face of the rotor laminated core. The functional body arrangement is then inserted between the rotor and the shaft essentially without contact. The wedge-shaped first fixing part is arranged radially on the outside, the wedge-shaped second fixing part is arranged radially on the inside. The first fixing part serves as an axial stop for the first body element. Contact between the fixing part and the first body element is made via the first spacer. The second body element with its second spacer protrudes slightly beyond the rotor laminated core on the opposite end face of the rotor laminated core. Finally, the second fixing part is mounted on the opposite end face of the rotor laminated core. During assembly of the second fixing part, the second body element is moved along the longitudinal axis in the direction of the first fixing part.Frictional contact exists solely between the second body element and a smooth surface of the shaft. The displacement of the second body element pushes the first body element radially outward. This increases the height of the functional body assembly transversely to the longitudinal axis. Frictional contact between the functional body assembly and the rough inner surface is avoided.

[0053] After installing the second fixing part, the functional body assembly can be secured against axial displacement. By increasing the height transverse to the longitudinal axis, the functional body assembly can be clamped between the shaft and the rotor. The functional body assembly can be pressed between the shaft and the rotor. The functional body assembly can be pressed between the shaft and the rotor in the area of ​​the receiving recess.

[0054] A third aspect of the application relates to an electric machine with the rotor arrangement according to the invention and the functional body arrangement according to the invention.

[0055] The electrical machine can be a permanent magnet synchronous motor (PMM). The electrical machine can be a reluctance motor.

[0056] The electric machine can be an electric machine for vehicles, industrial machines, generators, or traction drives. The vehicle can be a motor vehicle, truck, two-wheeler, rail vehicle, or other vehicle.

[0057] There are embodiments that comprise a plurality of functional body arrangements that are arranged in a circumferential direction around a common axis of rotation between the inner surface of the rotor and the outer surface of the shaft.

[0058] Each functional body arrangement can be arranged in the region of a respective receiving recess. The multiple functional body arrangements can be arranged such that they do not contact each other. The multiple functional body arrangements can be identical.

[0059] The invention is explained in more detail below by way of example and with reference to the accompanying figures. Identical or similar components are designated by identical reference numerals. They show: Fig. 1a a schematic sectional view of a functional body arrangement according to the invention in a first position; Fig. 1b a schematic sectional view of the functional body arrangement in an installed position in a second position; Fig. 2 a schematic sectional view of the functional body arrangement with front-side spacers and fixing parts; Fig. 3a a perspective view of a first body element of the functional body arrangement; Fig. 3b a perspective view of a second body element of the functional body arrangement; Fig. 3c a perspective view of the functional body arrangement with the first and second body elements; Fig. 4 a perspective sectional view of the functional body arrangement; Fig. 5 a front view of the functional body arrangement; Fig. 6 a schematic sectional view of a rotor arrangement according to the invention with the functional body arrangement in the installed position with a fluid; Fig. 7 a front view of the rotor assembly with the functional body assembly in the installed position; and Fig. 8 a schematic front view of an electrical machine according to the invention with the rotor arrangement and the functional body arrangement. Fig. 1a and Fig. 1b each show a schematic sectional view of a functional body arrangement 1 according to the invention in different positions. In Fig. 1a, the functional body arrangement 1 is in a first position O. In Fig. 1b, the functional body arrangement 1 is in a second position F.

[0060] The functional body arrangement 1 is arranged in a schematically illustrated rotor arrangement 50 between an inner shaft 70 and a receiving recess 55 of an outer rotor 51. The rotor 51 and the shaft 70 have a common axis of rotation R. The functional body arrangement 1 is composed of a first body element 3 and a second body element 5. The two body elements 3, 5 each have a wedge-shaped cross-section with an oblique or diagonal side surface. When changing from the first position O ( Fig. 1a) to the second position F ( Fig. 1b) the wedge-shaped body elements 3, 5 are pushed into each other.

[0061] The first guide section 3a is formed on the inclined side surface of the first body element 3. The second guide section 5a is formed on the inclined side surface of the second body element 5. The two body elements 3, 5 lie on top of one another via the inclined side surfaces and contact one another via the first and second guide sections 3a, 5a. The first and second body elements 3, 5 are aligned with one another such that they can be slidably coupled to one another along a longitudinal axis L via the first and second guide sections 3a, 5a.

[0062] The nested first and second body elements 3, 5 together form a height H of the functional body arrangement 1. The height H is a dimension transverse to the longitudinal axis L. When the functional body arrangement 1 is arranged between the rotor 51 and the shaft 70, the height H in the area between the rotor 51 and the shaft 70 is relevant. The height H changes when the two body elements 3, 5 are displaced along the longitudinal axis L.

[0063] In Fig. Figure 1a shows the first position O of the functional body assembly 1. The height H is less than the distance between the rotor 51 and the shaft 70. The first position O also corresponds to a pre-assembly position. This allows the functional body assembly 1 to be inserted essentially contactlessly between an inner surface 53 of the rotor 51 in the region of the receiving recess 55 and an outer surface 71 of the shaft 70.

[0064] In Fig. Figure 1b shows the second position F of the functional body assembly 1. In the second position F, the functional body assembly 1 is in an installed position. The height H corresponds to the distance between the rotor 51 and the shaft 70. The functional body assembly 1 is arranged so as to fill the space between the rotor 51 and the shaft 70. The first body element 3 is arranged on top and contacts the inner rough surface 53 of the rotor 51. The second body element 5 is arranged on the bottom and contacts the outer smooth surface 71 of the shaft 70.

[0065] When adjusting from the first position O to the second position L, the second body element 5 is moved along the longitudinal axis L in a direction of the first body element 3. The first body element 3 is moved along the longitudinal axis L via an axial stop (shown in Fig. 2) is held in position. Axial displacement along the longitudinal axis L occurs only on the second body element 5 along the smooth outer surface 71 of the shaft 70. Due to the wedge-shaped geometry of the first and second body elements 3, 5, the first body element 3 only experiences displacement along a height direction transverse to the longitudinal axis L. The height H of the functional body arrangement 1 increases. Due to the displacement along the height direction, the first body element 3 is pressed or pressed against the rough inner surface 53 of the rotor 50.

[0066] Fig. 2 shows the schematic sectional view of the functional body arrangement 1 from Fig. 1b with frontal spacers 3c, 5c and fixing parts 80. In contrast to Fig. 1a and Fig. 1b are in Fig. 2, the spacers 3c, 5c are formed on the body elements 3, 5. The first spacer 3c is formed on an end face 3s of the first body element 3. The second spacer 5c is formed on an end face 5s of the second body element 5.

[0067] The first spacer 3c and the second spacer 5c are each arranged on opposite end faces.

[0068] A disc-shaped fixing part 80 is arranged on each end face of the rotor 51. The fixing part 80 attached to the left side also serves as an axial stop for the first body element 3 during assembly of the functional body assembly 1.

[0069] In Fig. 2, the functional body arrangement 1 in the rotor arrangement 50 is in the installed position in the second position F. The functional body arrangement 1 contacts the fixing part 80 on the left side via the first spacer 3c of the first body element 3. The functional body arrangement 1 contacts the fixing part 80 on the right side via the second spacer 5c of the second body element 5. The functional body arrangement 1 is positioned and fixed along the longitudinal axis L via the fixing parts 80 and the two spacers 3c, 5c. A channel space is formed on each end face between the functional body arrangement 1 and the fixing parts 80 via the spacers 3c, 5c.

[0070] Fig. 3a shows a perspective view of the first body element 3. Fig. 3b shows a perspective view of the second body element 5. A web arrangement 3b, 5b is formed on each of the first and second body elements 3, 5. The web arrangement 3b, 5b runs along the longitudinal axis L (not shown) on a surface 7 of the body element 3, 5. The web arrangement 3b, 5b is offset from the surface 7.

[0071] The first body element 3 and the second body element 5 can be slidably coupled to one another via a dovetail joint 11. Different parts (components) of the dovetail joint are formed on the first and second body elements 3, 5. The different parts are formed along the first and second guide sections 3a, 5a. The different parts are formed on the first and second guide sections 3a, 5a. The different parts are formed on the respective inclined side surfaces.

[0072] On the first body element 3, a male part 13a of the dovetail connection 11 is formed in the region of an end face 3o, and a female part 13b of the dovetail connection 11 is formed in the region of the opposite end face 3s. On the second body element 5, a male part 15a of the dovetail connection 11 is formed in the region of an end face 5o, and a female part 15b of the dovetail connection 11 is formed in the region of the opposite end face 5s. A threading geometry 13c is formed in a central region of the first body element 3. A threading geometry 15c is formed in a central region of the second body element 5. The threading geometry 13c, 15c is each flat.

[0073] On the first body element 3, a first opening 3d is further formed on the end face 3s with the first spacer 3c. On the second body element 5, a second opening 5d is further formed on the end face 5s with the first spacer 5c.

[0074] Fig. 3c shows a perspective view of the functional body arrangement 1 with the Fig. 3a shown first body element 3 and the one in Fig. 3b. The functional body arrangement 1 is in a second position (F). The first body element 3 and the second body element 5 are connected to one another via the dovetail joint 11. The first body element 3 and the second body element 5 are connected to one another in a non-detachable manner along the height H transverse to the longitudinal axis L. Furthermore, the first body element 3 and the second body element 5 are connected to one another in a non-detachable manner along the width transverse to the longitudinal axis L.

[0075] Fig. 4 shows a perspective sectional view of the functional body arrangement 1 from Fig. 3c. A common opening 6 is formed within the first body element 3 and the second body element 5. The common opening 6 is formed from the first opening 3d of the first body element 3 and the second opening 5d of the second body element 5. The first opening 3d and the second opening 5d are each formed as a through-opening. The first opening 3d and the second opening 5d form the common opening 6 in the installed position in the second position F. The common opening 6 runs along the longitudinal axis L.

[0076] Fig. 5 shows a front view of the functional body arrangement 1 from Fig. 3c. The first and second body elements 3, 5 together form an oval cross-section of the functional body arrangement 1. The oval cross-section refers to a viewing direction along the longitudinal axis L. The web arrangement 3b of the first body element 3 and the web arrangement 5b of the second body element 5 stand out from the oval cross-section in an upper and a lower region of the functional body arrangement 1, respectively. A cross-sectional contour of the functional body arrangement 1 has a vertical and a horizontal plane of symmetry.

[0077] Fig. 6 shows a schematic sectional view of the rotor assembly 50 according to the invention with the functional body assembly 1 in the installed position. In contrast to Fig. 2, a first web arrangement 3b is formed on the functional body arrangement 1, and a second web arrangement 5b is formed on the surface 7. This forms a channel arrangement 10 between the inner circumferential surface 53 of the rotor 51 and the functional body arrangement 1. The channel arrangement 10 is also formed between the outer circumferential surface 71 of the shaft 70 and the functional arrangement 1.

[0078] Furthermore, Fig. 6 in contrast to Fig. 2, an inlet opening 81 is formed on the right-hand fixing part 80. An outlet opening 83 is formed on the left-hand fixing part 80. Viewed from the rotational axis R, the inlet opening 81 is radially closer to the rotational axis R than the outlet opening 83. A fluid 30 is introduced via the inlet opening 81. The fluid 30 is discharged via the outlet opening 83.

[0079] In the view in Fig. 6 shows the rotor arrangement 50 during a rotational movement about the rotational axis R. The fluid 30 is introduced under pressure via the inlet opening 81. A centrifugal force resulting from the rotational movement presses the fluid 30 through a cavity in the direction of the inner circumferential surface 53 of the rotor 50. The cavity is a channel space formed by the second spacer 5c between the inner wall of the fixing part 80 and the functional body element 1. Due to the increased pressure, the fluid 30 is guided along the longitudinal axis L or the rotational axis R in the direction of the outlet opening 83. The fluid 30 flows within the channel arrangement 10 along the inner circumferential surface 53 in the receiving recess 55 and cools the rotor 50. Finally, the fluid 30 is guided out via the outlet opening 83.

[0080] Fig. 7 shows a front view of the rotor arrangement 50 with the functional body arrangement 1 in the installed position. For simplification, only a section of an individual functional body element 1 in the installed position is shown. The fixing part 80 with outlet opening 83 is arranged on the front side. The fixing part 80 is shown partially transparent. The functional body arrangement 1 is inserted into the receiving recess 55. The first web arrangement 3b and the second web arrangement 5b contribute to dividing the channel arrangement 10 into several individual channels 10. The functional body arrangement 1 and the receiving recess 55 are geometrically coordinated such that the channels 10 located therebetween form the largest possible surface area while simultaneously having a small volume.

[0081] In Fig. 7 is also located as in Fig. 6 shows the rotor assembly 50 in a rotational movement. The fluid 30 or its level is schematically represented as a dashed line. The level is the level of the fluid 30 that occurs during the rotational movement. The outlet opening 83 is arranged lower in the radial direction than the fill level / level of the fluid 30 that occurs during the rotational movement. As a result, the circulating fluid 30 is guided out of the outlet opening 83 despite the rotational movement.

[0082] In Fig.Figure 8 shows a schematic front view of an electric machine 100 according to the invention, comprising the rotor assembly 50 and the functional body assembly 1. The electric machine 100 is schematically represented by a dashed frame. The rotor 51 and the shaft 70 are connected to one another in a rotationally fixed manner. Within the rotor assembly 50, a plurality of functional body assemblies 1 are arranged in the receiving recesses 55 of the rotor 51. The plurality of functional body assemblies 1 are arranged along a circumferential direction U around the rotation axis R.

[0083] The functional body arrangement according to the invention is not limited to use in an electric motor of a vehicle. The functional body arrangement can also be used in any other electrically operated assembly. Further aspects and embodiments of the present invention will become apparent to those skilled in the art from the claims. Reference symbol 1 Functional body arrangement 3 first body element 3a first guide section 3b Web arrangement of the first body element 3c first spacer 3d first opening 3s front side of the first body element 3o Front side of the first body element 5 second body element 5a second guide section 5b Web arrangement of the second body element 5c second spacer 5d second opening 5s front side of the second body element 5o Front side of the second body element 6 common opening 7 Surface 10 channel arrangement 11 Dovetail joint 13a male part of the dovetail joint (first body element) 13b female part of the dovetail joint (first body element) 13c Threading geometry (first body element) 15a male part of the dovetail joint (second body element) 15b female part of the dovetail joint (second body element) 15c Threading geometry (second body element) 30 Fluid 50 Rotor arrangement 51 Rotor 53 inner surface of the rotor 55 Recess 70 wave 71 outer surface of the shaft 80 Fixing part 81 Inlet opening 83 Outlet opening 100 electric machine F second position H Height B Direction along the width L Longitudinal axis O first position; pre-assembly position R rotation axis U circumferential direction

Claims

[1] Functional body arrangement (1) for an electrical machine (100) with a rotor (51) and a shaft (70), with a common axis of rotation (R), which is designed to be arranged in an installed position between an inner circumferential surface (53) of the rotor (51) and an outer circumferential surface (71) of the shaft (70), wherein the functional body arrangement (1) comprises a first body element (3) with a first guide section (3a) and a second body element (5) with a second guide section (5a), which can each be coupled to one another displaceably via the two guide sections (3a, 5a) along a longitudinal axis (L), and the functional body arrangement (1) has a lower height (H) transverse to the longitudinal axis (L) in a first position (O) along the longitudinal axis (L) than in a second position (F). [2] Functional body arrangement (1) according to claim 1, wherein the height (H) transverse to the longitudinal axis (L) of the functional body arrangement (1) is variable in a geometric relationship to the displacement along the longitudinal axis (L) of the first and second body elements (3, 5) relative to one another. [3] Functional body arrangement (1) according to claim 1 or 2, wherein the functional body arrangement (1) is designed such that in the installed position in the second position (F), the first body element (3) contacts a receiving recess (55) of the inner circumferential surface (53) of the rotor (51) and the second body element (5) contacts the outer circumferential surface (71) of the shaft (70). [4] Functional body arrangement (1) according to one of the preceding claims, wherein the first body element (3) and the second body element (5) are wedge-shaped. [5] Functional body arrangement (1) according to one of the preceding claims, wherein the first body element (3) comprises a web arrangement (3b) and / or the second body element (5) comprises a web arrangement (5b). [6] Functional body arrangement (1) according to claim 5, wherein the web arrangement (3b, 5b) is designed to form a channel arrangement (10) between the inner circumferential surface (53) of the rotor (51) and the functional body arrangement (1). [7] Functional body arrangement (1) according to one of the preceding claims, wherein the functional body arrangement (1) is designed as a displacement body, and a fluid (30) can be distributed in a defined manner along a surface (7) of the functional body arrangement (1) between the rotor (51) and the shaft (70). [8] Functional body arrangement (1) according to one of the preceding claims, wherein the first body element (3) comprises a first spacer (3c) on an end face (3s) and / or the second body element (5) comprises a second spacer (5c) on an end face (5s). [9] Functional body arrangement (1) according to one of the preceding claims, wherein in the installed position in the second position (F), the first body element (3) can be fixed to the second body element (5) at the end face via the functional body arrangement (1) with a fixing part (80) against displacement along the longitudinal axis (L). [10] Functional body arrangement (1) according to one of the preceding claims, wherein in the second position (F) the first body element (3) and the second body element (5) are non-releasably coupled to one another in a direction (11) along the height (H) transverse to the longitudinal axis (L). [11] Functional body arrangement (1) according to one of the preceding claims, wherein the first body element (3) has a first opening (3d) and the second body element (5) has a second opening (5d) which form a common opening (6) along the longitudinal axis (L) in the functional body arrangement (1). [12] Rotor arrangement (50) with a functional body arrangement (1) according to one of claims 1 to 11. [13] Rotor arrangement (50) according to claim 12, further comprising a rotor (51) and a shaft (70), wherein a receiving recess (55) for receiving the functional body arrangement (1) is formed on an inner circumferential surface (53) of the rotor (51). [14] Electrical machine (100) with a rotor arrangement (50) according to claim 12 or 13 and a functional body arrangement (1) according to one of claims 1 to 11. [15] Electrical machine (100) according to claim 14, comprising a plurality of functional body arrangements (1) which are arranged in a circumferential direction (U) about a common axis of rotation (R) between the inner circumferential surface (53) of the rotor (51) and the outer circumferential surface (71) of the shaft (70).

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