Rotor comprising an oil guiding geometry

Abstract

A rotor, particularly for an electric motor in a motor vehicle, includes a rotor shaft and a rotor lamination assembly. A star-shaped disk is disposed at at least one axial end of the rotor lamination assembly. A first oil passage in the rotor guides to the axial end of the rotor lamination assembly. A second oil passage, fluidly connected to the first oil passage, guides radially outward toward the radially inward end of the rotor winding head. An oil guiding geometry is formed at the star-shaped disk. The oil guiding geometry has a first oil guiding section that protrudes axially outward from the radially inward end of the rotor winding head, allowing oil to flow from the end of the second oil passage to the axially outer side of the rotor winding head. The oil guiding geometry also has a second oil guiding section that protrudes less or not at all from the radially inward end of the rotor winding head than the first oil guiding section, allowing oil to flow from the end of the second oil passage to the axially inward side of the rotor winding head.

Description

Technical Field

[0001] This invention relates to a rotor, particularly a rotor for an electric motor in a motor vehicle, the rotor comprising an oil-guiding geometry. Background Technology

[0002] It is known that electric motors, such as drive motors for motor vehicles, can use rotors comprising a rotor shaft located radially inward and a rotor lamination assembly arranged radially around the rotor shaft, the rotor lamination assembly being torsionally connected to the rotor shaft. The rotor lamination assembly can be constructed by stacking rotor laminations.

[0003] This type of rotor lamination assembly can accommodate windings that form rotor winding heads at the axial ends of the rotor lamination assembly. It is known that the rotor winding heads of this type of rotor generate heat during operation and can be cooled, especially by means of oil cooling, for example by oil lubrication of the rotor winding heads or direct oil spray cooling.

[0004] However, it is difficult to cool the rotor winding head sufficiently. To dissipate the heat loss generated in the rotor, it is known to provide cooling channels within the rotor, through which a cooling fluid, particularly oil, flows. At the axial ends of the rotor, the rotor winding head can be cooled by the oil flowing within the rotor's cooling channels. However, to date, this method has not been able to ensure the desired level of cooling of the winding head.

[0005] In electrically excited motors, star-shaped disks are known to be used to mechanically support the rotor winding heads against high centrifugal forces during rapid rotor rotation. These star-shaped disks are positioned at the axial ends of the rotor. One side of the star-shaped disk is typically adjacent to the rotor laminations. The rotor windings, particularly the rotor winding heads, extend from the other side of the star-shaped disk. Summary of the Invention

[0006] The object of the present invention is to improve rotors in this respect, particularly rotors for motors in motor vehicles, and especially to provide a rotor whose rotor winding heads can be cooled simply and efficiently.

[0007] The objective is achieved by a rotor, particularly a rotor for an electric motor in a motor vehicle, comprising a rotor shaft and a rotor lamination assembly surrounding the rotor shaft, wherein a star-shaped disk is disposed at at least one axial end of the rotor lamination assembly, such that the basic element of the star-shaped disk is positioned between the axial end of the rotor lamination assembly and the rotor winding head, wherein at least one first oil passage in the rotor leads to the axial end of the rotor lamination assembly, wherein at least one second oil passage fluidly connected to the first oil passage is guided radially outward toward the radially inward end of the rotor winding head, wherein at the end of the second oil passage, in the star... The disc is provided with an oil guiding geometry, which has a first oil guiding section that protrudes axially outward from the radially inner end of the rotor winding head, so that oil flows from the end of the second oil channel to or is guided to the axially outer side of the rotor winding head. The oil guiding geometry also has a second oil guiding section that protrudes axially outward from the radially inner end of the rotor winding head to a significantly less extent than the first oil guiding section, or does not protrude outward at all, so that oil flows from the end of the second oil channel to or is guided to the axially inner side of the rotor winding head.

[0008] According to the present invention, the rotor has an oil guiding structure or oil guiding geometry, which has a protrusion, finger or rib, i.e. a first oil guiding section, which guides the cooling fluid, i.e. oil, to the axially outer side of the rotor winding head, and a second oil guiding section, particularly a missing or significantly shorter protrusion, finger or rib, which constitutes a second oil channel for guiding the same oil radially outward to the axially inner side of the rotor winding head.

[0009] In this manner, a simple yet dual-function oil-guiding geometry, particularly with a suitable finger-like structure at the star-shaped disk, can cool both the axially visible internal surfaces of the rotor winding head and the outer surfaces. This results in more surfaces of the rotor winding head being directly cooled, achieving improved cooling of the rotor winding head as a whole. Consequently, the continuous power of the motor can be increased.

[0010] Improvements to the present invention are given in the dependent claims, the specification, and the drawings.

[0011] Preferably, the boundary wall extends radially outward and is positioned opposite the end of the first oil guide section, such that oil flows from the end of the second oil passage between the first oil guide section and the boundary wall to the axially outer side of the rotor winding head, wherein the boundary wall is preferably formed by a star-shaped disk.

[0012] Preferably, the rotor has rotor poles, and the oil guiding geometry at the star disk is formed at the rotor poles, such that the first oil guiding section and the second oil guiding section are provided to the same rotor pole, so that oil flows from the end of the second oil channel to or is guided to the axial outer and axial inner sides of the rotor winding head of the same rotor pole.

[0013] Preferably, the oil guiding geometry at the star disk is configured at each rotor pole such that a corresponding first oil guiding section and a corresponding second oil guiding section are provided to the corresponding rotor pole, so that oil flows from the end of the corresponding second oil channel to or is guided to the axial outer side and axial inner side of the rotor winding head of the corresponding rotor pole.

[0014] Preferably, at each rotor pole in the rotor, at least one first oil passage leads to the axial end of the rotor lamination assembly, and each first oil passage is fluidly connected to at least one radially outwardly directed second oil passage of the corresponding rotor pole. Thus, at each rotor pole, its own axial oil supply is configured via the provided first oil passage.

[0015] Preferably, the oil guiding geometry is constructed as a single piece using a star-shaped disk. In another embodiment, the oil guiding geometry is constructed as a separate component at the star-shaped disk, and preferably fastened thereto.

[0016] Preferably, the first oil guide section—and therefore preferably a finger or rib—protrudes axially outward within a range of at least 50%, preferably at least 70% or at least 90% of the axial width of the rotor winding head.

[0017] The second oil guide section—a partially missing or significantly shortened finger or rib—preferably protrudes axially outward within a range of up to 20% of the axial width of the rotor winding head. Preferably, the second oil guide section is formed from a star-shaped disk basic element and, in the radial region between the rotor lamination assembly and the axially inner side of the rotor winding head, does not protrude at all relative to the width of the basic element—or at least protrudes less than 100% of the width between the rotor lamination assembly and the axially inner side of the rotor winding head.

[0018] Preferably, a third oil passage, which is fluidly connected to the second oil passage via an oil guiding geometry, is radially guided outward between the axial inner side of the rotor lamination assembly and the rotor winding head, such that oil flows through the third oil passage from the axial inner side of the rotor winding head to or is guided to the radial outer side of the rotor winding head, wherein the third oil passage particularly preferably terminates radially at the radial outer side of the rotor winding head.

[0019] Preferably, a fourth oil passage, which is fluidly connected to the second oil passage via an oil guiding geometry, is guided radially outward along the axial outer side of the rotor winding head, such that oil flows through the fourth oil passage to or is guided to the radial outer side of the rotor winding head at the axial outer side of the rotor winding head, wherein the fourth oil passage particularly preferably terminates radially at the radial outer side of the rotor winding head.

[0020] The fourth oil passage is preferably located axially outside the end cap clearance. Attached Figure Description

[0021] The invention is described below with reference to the accompanying drawings.

[0022] Figure 1 A schematic cross-sectional view of the rotor according to the invention is shown in the region of the oil guide geometry.

[0023] Figure 2 A three-dimensional cross-sectional view of the rotor according to the present invention is shown.

[0024] Figure 3a Showing according to Figure 2 A front view of the rotor according to the present invention.

[0025] Figure 3b Showing according to Figure 3a A sectional view of the rotor according to the invention from the side in the region of the first oil guide section.

[0026] Figure 3c The following is shown: Based on the installation of end caps Figure 3a A side view of the rotor according to the present invention.

[0027] Figure 3d Showing according to Figure 3a A sectional view of the rotor according to the invention in the region of the second oil guide section, viewed from the side.

[0028] Figure 4 Showing according to Figure 3d A schematic three-dimensional diagram of the rotor according to the invention in the region of the second oil guide section.

[0029] Figure 5 Showing according to Figure 3d A schematic three-dimensional view of the rotor according to the invention in the region of the first oil guide section.

[0030] Figure 6 A schematic three-dimensional diagram of the rotor according to the invention is shown in the region of the oil-guiding geometry. Detailed Implementation

[0031] exist Figure 1The rotor according to the invention is shown in the region of the oil guiding geometry 8 of the star disk 3, which is used to deliver oil to the axially outer side 5.1 of the rotor winding head 5 and simultaneously to the axially inner side 5.2 of the rotor winding head 5.

[0032] The same rotor Figure 2 It is shown in three dimensions as a cross-section and in Figure 3a From the front, observe.

[0033] The rotor includes a rotor shaft 1 and a rotor lamination assembly 2 surrounding the rotor shaft 1. Star-shaped disks 3 are respectively disposed at two axial ends of the rotor lamination assembly 2, such that the plate-like basic elements 4 of the star-shaped disks 3 are positioned between the axial ends of the rotor lamination assembly 2 and the rotor winding head 5. A first oil passage 6 is guided within the rotor to the axial ends of the rotor lamination assembly 2. A second oil passage 7, fluidly connected to the first oil passage 6, is guided radially outward toward the radially inward end of the rotor winding head 5.

[0034] At the end of the second oil passage 7, an oil guiding geometry 8 is formed at the star-shaped disk 3. The oil guiding geometry 8 has a first oil guiding section 9 (see...). Figure 3b and Figure 5 The first oil guide section 9 protrudes axially outward from the radially inward end of the rotor winding head 5, thereby forming a "finger" that guides oil from the end of the second oil passage 7 to the axially outer side 5.1 of the rotor winding head 5. The first oil guide section 9 protrudes axially outward over a range of at least 50% of the axial width of the rotor winding head 5, thereby guiding oil into the region of the outer side 5.1 of the rotor winding head 5.

[0035] The fourth oil passage 14 (see [reference]) is fluidly connected to the second oil passage 7 via the oil guiding geometry 8. Figure 5 The oil is guided radially outward along the axial outer side 5.1 of the rotor winding head 5, so that the oil flows through the fourth oil passage 14 from the axial outer side 5.1 of the rotor winding head 5 to the radial outer side of the rotor winding head 5. The fourth oil passage 14 terminates radially at the radial outer side of the rotor winding head 5.

[0036] As in Figure 3d As shown in the figure, the fourth oil passage 14 is axially externally limited by an end cap 15 or a similar covering member.

[0037] The oil guiding geometry 8 has a second oil guiding section 10 (see...) Figure 1 , Figure 3d and Figure 4The second oil guide section protrudes less axially outward from the radially inward end of the rotor winding head 5 than the first oil guide section 9—thus forming a significantly shorter “finger”—or does not protrude outward at all, so that oil is guided from the end of the second oil passage 7 to the axially inward side 5.2 of the rotor winding head 5.

[0038] The third oil passage 13 (see [reference]) is fluidly connected to the second oil passage 7 via the oil guiding geometry 8. Figure 4 The oil is guided radially outward between the rotor lamination assembly 2 and the axial inner side 5.2 of the rotor winding head 5, so that the oil flows through the third oil channel 13 from the axial inner side 5.2 of the rotor winding head 5 to the radial outer side of the rotor winding head 5. The third oil channel 13 terminates radially at the radial outer side of the rotor winding head 5.

[0039] The boundary wall 11 extends radially outward and is positioned opposite the end of the first oil guide section 9, so that oil flows from the end of the second oil passage 7 between the first oil guide section 9 and the boundary wall 11 to the axial outer side 5.1 of the rotor winding head 5, wherein the boundary wall 11 is preferably composed of a star disk 3.

[0040] This configuration of the oil guiding geometry 8 is set at the two axial ends of the rotor.

[0041] The rotor has multiple rotor poles 12, such as six rotor poles 12, and the oil guiding geometry 8 is formed on the star disk 3 at the rotor pole 12, such that the first oil guiding section 9 and the second oil guiding section 10 are both provided to the same rotor pole 12, so that oil flows from the end of the second oil passage 7 to the axial outer side 5.1 and axial inner side 5.2 of the rotor winding head 5 of the same rotor pole 12.

[0042] Oil guiding geometry 8 - as in Figure 3a As shown in the figure, a star disk 3 is formed on each rotor pole 12 such that a corresponding first oil guide section 9 and a corresponding second oil guide section 10 are provided to the corresponding rotor pole 12, such that oil flows from the end of the corresponding second oil passage 7 to the axial outer side 5.1 and axial inner side 5.2 of the rotor winding head 5 of the corresponding rotor pole 12.

[0043] The oil guiding geometry 8 is constructed in one piece via a star-shaped disk 3.

[0044] Figure 4 This is a three-dimensional view of the rotor according to the present invention in the region of the second oil guide section 10. Figure 5 This is a three-dimensional diagram of the same rotor in the region of the first oil guide section 9. Oil flows along the third oil passage 13 ( Figure 4 ) and fourth oil passage 14 ( Figure 5 The path is shown by arrows in the direction of flow.

[0045] Therefore, the oil is transported to the end of the rotor lamination assembly 2 within the rotor. This can be done via the rotor shaft, in the oil passage between the shaft and the lamination assembly, or directly within the lamination assembly. The oil can then flow into the star disk 3 through the radially arranged channel 7.

[0046] Oil flows separately to both rotor winding heads and to each rotor pole 12. Axial finger structures 9 and 10 are used here to distribute oil to two flow paths. The finger structures 9 and 10 are formed by at least two individual or integrated rib-like components projecting axially from the star disk 3. These components can distribute oil according to the rotor rotation direction. Through the first path, oil flows through a radial oil channel 13 between the star disk 3 and the inner surface 5.2 of the rotor winding head. This oil channel terminates at the outer diameter of the rotor winding head 5. The second path is used to wet the outer surface 5.1 of the rotor winding head. This is feasible without the end cap 15, but the end cap 15 can be used to form a closed oil channel 14. This flow path also terminates at the outer diameter of the rotor winding head 5.

[0047] This patent application claims priority to German patent application 102025114289.0, the disclosure of which is hereby incorporated herein by reference.

[0048] List of reference numerals

[0049] 1 rotor shaft

[0050] 2 rotor lamination group

[0051] 3-star disk

[0052] 4 Basic components of a star-shaped disk

[0053] 5 rotor winding heads

[0054] 5.1 Axial outer side of rotor winding head

[0055] 5.2 Axial inner side of rotor winding head

[0056] 6 First oil channel

[0057] 7 Second oil passage

[0058] 8. Oil guiding geometry

[0059] 9. First oil guiding section of the oil guiding geometry

[0060] The second oil guiding section of the 10 oil guiding geometry

[0061] 11 limiting wall

[0062] 12 rotor poles

[0063] 13 Third Oil Channel

[0064] 14 Fourth Oil Channel

[0065] 15 end caps

Claims

1. A rotor, particularly for an electric motor in a motor vehicle, the rotor comprising a rotor shaft (1) and a rotor lamination assembly (2) surrounding the rotor shaft (1), wherein a star disk (3) is disposed at at least one axial end of the rotor lamination assembly (2), such that a basic element (4) of the star disk (3) is disposed between the axial end of the rotor lamination assembly (2) and a rotor winding head (5), wherein at least one first oil passage (6) is guided in the rotor to the axial end of the rotor lamination assembly (2). At least one second oil channel (7) which is fluidly connected to the first oil channel (6) is guided radially outward toward the radially inward end of the rotor winding head (5), wherein at the end of the second oil channel (7), an oil guiding geometry (8) is formed at the star disk (3), wherein the oil guiding geometry (8) has a first oil guiding section (9) which protrudes axially outward from the radially inward end of the rotor winding head (5) so that oil flows from the end of the second oil channel (7) to the axially outer side of the rotor winding head (5) (5.1), wherein the oil guiding geometry (8) has a second oil guiding section (10) which protrudes less axially outward from the radially inward end of the rotor winding head (5) than the first oil guiding section (9), or does not protrude outward at all, so that oil flows from the end of the second oil channel (7) to the axially inward side of the rotor winding head (5) (5.2).

2. The rotor according to claim 1, The boundary wall (11) extends radially outward and is positioned opposite the end of the first oil guide section (9), such that oil flows from the end of the second oil passage (7) between the first oil guide section (9) and the boundary wall (11) to the axial outer side (5.1) of the rotor winding head (5), wherein the boundary wall (11) is preferably formed by the star disk (3).

3. The rotor according to claim 1 or 2, The rotor has a rotor pole (12), and the oil guiding geometry (8) at the star disk (3) is formed at the rotor pole (12), such that the first oil guiding section (9) and the second oil guiding section (10) are provided to the same rotor pole (12), such that oil flows from the end of the second oil passage (7) to the axial outer (5.1) and axial inner (5.2) sides of the rotor winding head (5) of the same rotor pole (12).

4. The rotor according to claim 3, The oil guiding geometry (8) at the star disk (3) is formed at each rotor pole (12) such that the corresponding first oil guiding section (9) and the corresponding second oil guiding section (10) are provided to the corresponding rotor pole (12) such that oil flows from the end of the corresponding second oil passage (7) to the axial outer (5.1) and axial inner (5.2) sides of the rotor winding head (5) of the corresponding rotor pole (12).

5. The rotor according to claim 3, At each rotor pole (12) in the rotor, at least one first oil passage (6) is guided to the axial end of the rotor lamination group (2), and each first oil passage (6) is fluidly connected to at least one second oil passage (7) that is radially outwardly guided to the corresponding rotor pole (12).

6. The rotor according to claim 1 or 2, The oil guiding geometry (8) is formed as a single piece by the star disk (3), or the oil guiding geometry (8) is formed as a separate component at the star disk (3), preferably fastened at the star disk (3).

7. The rotor according to claim 1 or 2, The first oil guide section (9) protrudes axially outward within a range of at least 50%, preferably at least 70%, of the axial width of the rotor winding head (5), wherein the first oil guide section (9) preferably forms a finger and / or a rib.

8. The rotor according to claim 1 or 2, The second oil guide section (10) protrudes axially outward within a range of up to 20% of the axial width of the rotor winding head (5), or the second oil guide section (10) is formed by the basic element (4) of the star disk (3) and does not protrude relative to the width of the basic element (4) in the radial region between the rotor lamination group (2) and the axial inner side (5.2) of the rotor winding head (5), or the second oil guide section (10) protrudes at least less than 100% of the width between the rotor lamination group (2) and the axial inner side (5.2) of the rotor winding head (5).

9. The rotor according to claim 1 or 2, A third oil passage (13), which is fluidly connected to the second oil passage (7) via the oil guiding geometry (8), is guided radially outward between the rotor lamination assembly (2) and the rotor winding head (5) on the axial inner side (5.2), such that oil flows through the third oil passage (13) from the axial inner side (5.2) of the rotor winding head (5) to the radial outer side of the rotor winding head (5), wherein the third oil passage (13) preferably terminates radially at the radial outer side of the rotor winding head (5), and / or A fourth oil passage (14), which is fluidly connected to the second oil passage (7) via the oil guiding geometry (8), is guided radially outward along the axial outer side (5.1) of the rotor winding head (5), such that oil flows through the fourth oil passage (14) from the axial outer side (5.1) of the rotor winding head (5) to the radial outer side of the rotor winding head (5), wherein the fourth oil passage (14) preferably terminates radially at the radial outer side of the rotor winding head (5).

10. The rotor according to claim 9, The fourth oil passage (14) is axially externally bounded by an end cap (15).

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