Conjugate stator motor and vehicle powertrain

Abstract

The application provides a conjugate stator motor and a vehicle power system. The motor comprises a motor stator (100), which comprises a stator core (1) including a plurality of lamination groups (11) stacked together, the stator core (1) being provided with a plurality of axial oil holes (12) and stator core bolt holes (13) penetrating through the axial direction (A) of the stator core (1), at least one of the plurality of lamination groups (11) being provided with a circumferential connecting hole (14) communicating two axial oil holes (12) on the circumferential two sides of the stator core bolt hole (13), and a bolt (3) penetrating through the stator core bolt hole (13) to connect the stator core (1) to a shell (200) of the conjugate stator motor.

Description

Technical Field

[0001] This application belongs to the field of vehicle power technology, and specifically relates to a conjugate stator motor and a vehicle power system. Background Technology

[0002] With the miniaturization of vehicle drive systems and the increasing demand for high power, the use of conjugate stator motors has become a trend.

[0003] However, with the miniaturization of motors and the increasing demand for high power, the cooling of conjugate stator motors faces many challenges. Summary of the Invention

[0004] This application aims to propose a conjugate stator motor to solve or alleviate the deficiencies of the prior art.

[0005] This application provides a conjugate stator motor, including a motor stator, wherein the motor stator comprises:

[0006] A stator core, comprising multiple lamination groups stacked together, the stator core having multiple axial oil holes and stator bolt holes extending along the axial direction of the stator core, at least one of the lamination groups having a circumferential connecting hole connecting two of the axial oil holes on either side of the stator bolt holes; and

[0007] Bolts, which pass through the stator core bolt holes, thereby connecting the stator core to the housing of the conjugate stator motor.

[0008] In at least one possible implementation, the motor stator further includes two oil rings, which are respectively disposed at both axial ends of the stator core. Both oil rings are provided with oil injection holes, through which oil can be sprayed onto the end windings protruding from the axial ends of the stator core.

[0009] In at least one possible implementation, the oil ring includes a first oil ring and a second oil ring, the first oil ring and the second oil ring being respectively disposed at both axial ends of the stator core, the second oil ring and the head of the bolt or the nut threadedly connected to the bolt being located on the same axial side of the stator core, the second oil ring being provided with a second oil ring bolt hole for the bolt to pass through, and the second oil ring being solid and not forming grooves in the circumferential regions on both sides of the second oil ring bolt hole.

[0010] In at least one possible implementation, the surface of the second oil ring facing the stator core is provided with a plurality of arc-shaped grooves, the plurality of arc-shaped grooves extending circumferentially spaced along the second oil ring, and the bolt holes of the second oil ring are disposed between two adjacent arc-shaped grooves.

[0011] In at least one possible implementation, the surface of the first oil ring facing the stator core has an annular groove that extends circumferentially around the second oil ring.

[0012] The first oil ring is provided with a first oil ring bolt hole for the bolt to pass through. The first oil ring bolt hole is located at the bottom of the ring groove, and the ring groove includes a portion that bypasses the first oil ring bolt hole, thereby enabling the oil to flow circumferentially in the ring groove.

[0013] In at least one possible implementation, the first oil ring is provided with an oil inlet, the oil inlet being connected to the ring groove, and there are multiple oil inlets, which are spaced apart in the circumferential direction of the first oil ring.

[0014] In at least one possible implementation, the stacked sheet group includes a first stacked sheet group and a second stacked sheet group, wherein the first stacked sheet group is provided with the circumferential connecting hole, the second stacked sheet group is not provided with the circumferential connecting hole, and there are multiple first stacked sheet groups, with two first stacked sheet groups separated by the second stacked sheet group.

[0015] In at least one possible implementation, the laminations at both ends of the stator core are the second lamination group.

[0016] In at least one possible implementation, the conjugate stator motor is a dual-rotor motor, wherein the motor stator of the dual-rotor motor includes an inner stator and an outer stator, and the inner stator and the outer stator share a single stator core.

[0017] The embodiments of this application also propose a vehicle power system, including the conjugate stator motor described in any of the above technical solutions.

[0018] By adopting the above technical solution, a circumferential connecting hole is set in the stator core to connect the two axial oil holes on both sides of the stator core bolt hole in the circumferential direction, so that the oil can flow in the circumferential direction in the circumferential connecting hole, thereby solving or alleviating the problem that the annular groove is blocked by the bolt and the oil is difficult to flow in the circumferential direction. Attached Figure Description

[0019] Figure 1 A schematic diagram of a portion of the structure of a conjugate stator motor according to an embodiment of this application is shown.

[0020] Figure 2 A cross-sectional view of a portion of the structure of a conjugate stator motor according to an embodiment of this application is shown.

[0021] Figure 3 A schematic diagram of a portion of the structure of an electric motor stator according to an embodiment of this application is shown.

[0022] Figure 4 A cross-sectional view along the axis of a portion of the structure of an electric motor stator according to an embodiment of this application is shown.

[0023] Figure 5 A cross-sectional view along the plane containing the first lamination group is shown of a partial structure of an electric motor stator according to an embodiment of this application.

[0024] Figure 6 A cross-sectional view along the plane containing the second lamination group is shown of a partial structure of an electric motor stator according to an embodiment of this application.

[0025] Figure 7 A schematic diagram of the structure of the first lamination group of a motor stator according to an embodiment of this application is shown.

[0026] Figure 8 A schematic diagram of the structure of the second lamination group of a motor stator according to an embodiment of this application is shown.

[0027] Figure 9 A schematic diagram of the structure of the first oil ring of the motor stator according to an embodiment of this application is shown.

[0028] Figure 10 A schematic diagram of the structure of the second oil ring of the motor stator according to an embodiment of this application is shown.

[0029] Figure 11 A cross-sectional view of a possible conjugate stator motor structure is shown.

[0030] Figure 12 A cross-sectional view along the axis of a possible conjugate stator motor partial structure is shown.

[0031] Figure 13 A schematic diagram of the oil ring structure of a possible conjugate stator motor is shown.

[0032] Explanation of reference numerals in the attached figures

[0033] 100 motor stator 200 housing

[0034] 1. Stator core; 11. Lamination group; 11A First lamination group; 11B Second lamination group; 12. Axial oil hole; 13. Stator core bolt hole; 14. Circumferential connection hole; 15. Stator core pin hole.

[0035] 2 oil rings

[0036] 21 First oil ring 211 Oil inlet 212 First oil injection hole 213 First oil ring bolt hole 214 First oil ring pin hole 215 Ring groove

[0037] 22 Second oil ring; 221 Arc groove; 222 Second oil ring injection hole; 223 Second oil ring bolt hole; 224 Second oil ring pin hole

[0038] 3 bolts

[0039] 4 pins

[0040] A-axis and C-circumferential direction Detailed Implementation

[0041] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0042] like Figures 11 to 13 As shown, a possible conjugate stator motor includes a stator core 1, two oil rings 2, and bolts 3. The two oil rings 2 are respectively disposed at both axial ends of the stator core 1, and the bolts 3 pass through the two oil rings 2 and the stator core 1, fixing them to the housing 200. The surfaces of both oil rings 2 facing the stator core have annular grooves 215, thereby forming annular oil cavities at both axial ends of the stator core 1. The oil rings 2 are provided with oil injection holes communicating with the annular oil cavities to spray oil onto the end windings.

[0043] The above technical solution has the following defects.

[0044] (1) The oil ring 2 with the annular groove 215 has low rigidity. The bolt 3 squeezes the oil ring 2, which may cause the oil ring 2 to deform, thereby reducing the reliability of the bolt 3 connection and posing a risk of bolt 3 loosening.

[0045] (2) Due to limitations such as electrical safety distance, the size of the annular groove 215 of the oil ring 2 is limited, and the annular oil cavity is partially blocked by the bolt 3, resulting in restricted oil flow along the circumferential direction C and pressure loss of the oil flowing through the annular oil cavity. Consequently, the injection volume and injection pressure of the injection holes are relatively small, especially for injection holes far from the oil inlet. Software simulation results show that the injection pressure of injection holes far from the oil inlet is only about 1 / 10 of the pressure at the oil inlet.

[0046] like Figures 1 to 10 As shown, embodiments of this application propose a vehicle powertrain system, which may include a dedicated hybrid transmission (DHT) and an engine. The dedicated hybrid transmission may include a conjugate stator motor.

[0047] A conjugate stator motor can be a dual-rotor motor. A dual-rotor motor includes a housing 200, a stator 100, and a rotor, which can rotate relative to the stator 100. The stator of the dual-rotor motor can include an inner stator and an outer stator, which can share a single stator core. The portions of the inner and outer stator windings that protrude from the axial ends of the stator core are called end windings.

[0048] The motor stator 100 includes a stator core 1, oil rings 2, bolts 3, and pins 4. Two oil rings 2 can be respectively disposed at both axial ends of the stator core 1. The bolts 3 pass through the stator core 1 and the two oil rings 2, thereby connecting them to the housing 200 of the conjugate stator motor or dedicated hybrid power transmission (DHT). Both oil rings 2 are provided with oil injection holes, through which oil can be sprayed onto the end windings protruding from the axial ends of the stator core 1, thereby cooling the end windings.

[0049] The stator core 1 includes multiple lamination groups 11, which are stacked together. For example, six lamination groups 11 can be stacked together to form the stator core 1. The lamination group 11 may include multiple layers of laminations.

[0050] like Figures 4 to 8 As shown, the stator core 1 may be provided with axial oil holes 12, stator core bolt holes 13, circumferential connecting holes 14, and stator core pin holes 15. Multiple axial oil holes, stator core bolt holes 13, and stator core pin holes 15 may be provided along the circumferential direction C of the stator core 1. The axial oil holes 12, stator core bolt holes 13, and stator core pin holes 15 all penetrate the stator core 1 along the axial direction A.

[0051] Axial oil hole 12 is used to supply oil from one axial side of stator core 1. Figure 4 The right side of the middle) flows to the other side of the axis ( Figure 4 (Left side of the image). The stator core bolt hole 13 is for the bolt 3 to pass through, thereby connecting the stator core 1 to the housing 200 of the conjugate stator motor. The stator core pin hole 15 is for the pin 4 to pass through, thereby positioning the stator core 1 in the housing 200 of the conjugate stator motor.

[0052] At least one lamination group 11 is provided with a circumferential connecting hole 14, which connects to two axial oil holes 12 on both sides of the stator core bolt hole 13 in the circumferential direction. Through the circumferential connecting hole 14, oil can flow from one side of the bolt 3 in the circumferential direction to the other side of the bolt 3 in the circumferential direction.

[0053] The lamination group 11 includes a first lamination group 11A and a second lamination group 11B.

[0054] The first lamination group 11A may be provided with axial oil holes 12, stator core bolt holes 13, circumferential connecting holes 14, and stator core pin holes 15. The circumferential connecting holes 14 can penetrate the first lamination group 11A along the axial direction A, and can connect the two axial oil holes 12 on both sides of the stator core bolt holes 13 in the circumferential direction. Observed along the axial direction A, the circumferential connecting holes 14 can be an arc shape extending along the circumferential direction C, and the circumferential connecting holes 14 form a flow channel for oil to flow along the circumferential direction C inside the stator core 1.

[0055] Optionally, the circumferential connecting hole 14 can also be connected to the stator core bolt hole 13.

[0056] The second lamination group 11B may be provided with axial oil holes 12, stator core bolt holes 13, and stator core pin holes 15. The second lamination group 11B is not provided with circumferential connecting holes 14, and each axial oil hole 12 is independent of each other and is not directly connected to each other.

[0057] Optionally, two of the multiple stacked groups 11 are designated as the first stacked group 11A.

[0058] Optionally, a second lamination group 11B can be spaced between the two first lamination groups 11A. This allows the stator core 1 to have higher strength, enabling it to withstand the compression of the bolts 3 and improving the reliability of the bolted connection.

[0059] Optionally, the lamination groups 11 at both axial ends of the stator core 1 can be second lamination groups 11B. It is understood that since the second lamination group 11B has less hollowed-out portion than the first lamination group 11A, the second lamination group 11B has better strength. Therefore, setting the second lamination group 11B at both axial ends of the stator core 1 can result in higher strength of the stator core 1 and better reliability of the bolt connection.

[0060] Optionally, in the six stacked sheets 11, the second and fifth stacked sheets can be first stacked sheets 11A, and the remaining four stacked sheets can be second stacked sheets 11B. That is, there can be two second stacked sheets 11B between two first stacked sheets 11A.

[0061] like Figure 4 As shown, the oil ring 2 includes a first oil ring 21 and a second oil ring 22, which are respectively disposed at both axial ends of the stator core 1. The heads of the second oil ring 22 and the bolt 3 are located on the same axial side of the stator core 1. Figure 4 (Left side of the middle). The first oil ring 21 can be disposed on one side near the part of the housing 200 that connects to the motor stator 100. Figure 4 The second oil ring can be located on the other side of the part connecting the motor stator 100 away from the housing 200 (right side). Figure 4 (Left side of the middle).

[0062] It is understandable that the second oil ring 22 can also be tightened by the nut that is threadedly connected to the bolt 3.

[0063] like Figure 3 , Figure 4 and Figure 9 As shown, the surface of the first oil ring 21 facing the stator core 1 can be provided with an annular groove 215, which extends circumferentially C along the first oil ring 21. The first oil ring 21 can be provided with an oil inlet 211, a first oil injection hole 212, a first oil ring bolt hole 213, and a first oil ring pin hole 214. The oil inlet 211, the first oil ring bolt hole 213, and the first oil ring pin hole 214 all penetrate the first oil ring 21 along the axial direction A. Multiple first oil ring bolt holes 213 can be provided (e.g., 12) for bolts 3 to pass through and fix the stator core 1 and the oil ring 2 to the housing 200. Multiple first oil ring pin holes 214 can be provided (e.g., 3) for pins 4 to pass through and position the stator core 1 and the oil ring 2.

[0064] The oil inlet 211, the first oil ring bolt hole 213, and the first oil ring pin hole 214 can all be located at the bottom of the ring groove 215.

[0065] The first oil injection hole 212 can be connected to the annular groove 215. The first oil injection hole 212 can be inclined relative to the radial direction. The first oil injection hole 212 is used to spray oil onto the end winding. The first oil injection hole 212 includes two sets of first oil injection holes 212 that can respectively spray oil onto the end winding of the inner stator and the end winding of the outer stator.

[0066] like Figure 9 As shown, multiple oil inlets 211 can be provided, and these multiple oil inlets 211 can be spaced apart on the circumferential C of the first oil ring 21, so that the oil pressure or flow rate at various positions on the circumferential C of the annular groove 215 is approximately the same. Optionally, two oil inlets 211 can be provided, and the two oil inlets 211 can be spaced apart by a relatively large distance (or a large angle) on the circumferential C of the first oil ring 21, for example, they can be spaced apart by 140 degrees to 180 degrees.

[0067] Optionally, the oil inlet 211 is directly opposite at least one axial oil hole 12 located next to the stator core bolt hole. This allows the oil entering the annular groove 215 through the oil inlet 211 to directly enter the axial oil hole 12 without circumferential flow, ensuring a smooth and unobstructed flow path and minimizing oil pressure loss.

[0068] The annular groove 215 extends over the entire circumference of the first oil ring 21. The annular groove 215 includes a portion that passes around the first oil ring bolt hole 213 and the first oil ring pin hole 214, thereby enabling oil to flow in the annular groove 215 in the circumferential direction C.

[0069] like Figure 2 , Figure 4 and Figure 10 As shown, the surface of the second oil ring 22 facing the stator core 1 can be provided with multiple arc-shaped grooves 221, and the multiple arc-shaped grooves 221 can extend at intervals along the circumference C of the second oil ring 22.

[0070] The second oil ring 22 may be provided with a second oil ring injection hole 222, a second oil ring bolt hole 223, and a second oil ring pin hole 224. The second oil ring bolt hole 223 extends through the second oil ring 22 along the axial direction A. Multiple second oil ring bolt holes 223 may be provided (e.g., 12) for bolts 3 to pass through and fix the stator core 1 and oil ring 2 to the housing 200. The second oil ring pin hole 224 is a blind hole. Multiple second oil ring pin holes 224 may be provided (e.g., 3) for accommodating the end of the pin 4.

[0071] In the circumferential regions on both sides of the second oil ring bolt hole 223, the second oil ring 22 is solid and does not form a groove. This results in lower contact stress on the second oil ring 22 and better mechanical connection rigidity. When the head of the bolt 3 is pressing against the second oil ring 22, the second oil ring 22 is not prone to collapse or deformation, can withstand a large bolt preload, the bolt 3 is not prone to loosening, and the connection reliability of the bolt 3 is good.

[0072] The second oil ring injection hole 222 can be connected to the arc groove 221. The second oil ring injection hole 222 can be inclined relative to the radial direction. The second oil ring injection hole 222 is used to spray oil onto the end winding. The second oil ring injection hole 222 includes two sets of injection holes that can spray oil onto the end winding of the inner stator and the end winding of the outer stator respectively.

[0073] The flow path of oil in the motor stator is described below.

[0074] Oil enters the annular groove 215 through the oil inlet 211 and flows circumferentially C within the annular groove 215, then enters the stator core through the axial oil holes 12. When the oil flows to the first lamination group 11A, it can flow circumferentially C between adjacent axial oil holes 12 through the circumferential connecting holes 14, thereby reducing the oil pressure difference between different axial oil holes 12. This solves or alleviates the problem of poor oil flow caused by the annular groove 215 being blocked by the bolt 3, resulting in oil pressure loss in the portion far from the oil inlet 211, ensuring that the oil sprayed from the injection holes reaches the end windings. According to software simulation, the injection pressure at the injection hole farthest from the oil inlet 211 can reach more than half of the inlet pressure.

[0075] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0076] (1) In the above specific embodiment, two first stacked lamination groups 11A are provided, but this application is not limited to this. In other possible embodiments, one or more than two first stacked lamination groups (e.g., three) may be provided.

[0077] (2) In the above specific embodiment, the two first stacked sheets 11A are spaced apart by two second stacked sheets 11B, but this application is not limited to this. In other possible embodiments, the two first stacked sheets 11A may be spaced apart by one second stacked sheet.

[0078] (3) In the above specific embodiments, the circumferential connecting hole 14 is connected to the stator core bolt hole 13, but this application is not limited to this. In other possible embodiments, without affecting the strength and electromagnetic performance of the stator core, the circumferential connecting hole and the stator core bolt hole can be independently separated, that is, the circumferential connecting hole can bypass the core bolt hole and connect to two adjacent axial oil holes.

[0079] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0080] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0081] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0082] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0083] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A conjugate stator motor, comprising a motor stator (100), characterized in that, The motor stator (100) includes: A stator core (1), comprising multiple lamination groups (11) stacked together, the stator core (1) having multiple axial oil holes (12) and stator core bolt holes (13) extending along the axial direction (A) of the stator core (1), at least one of the lamination groups (11) having a circumferential connecting hole (14) connecting the two axial oil holes (12) on both circumferential sides of the stator core bolt holes (13); and Bolt (3) passes through the stator core bolt hole (13) to connect the stator core (1) to the housing (200) of the conjugate stator motor.

2. The conjugate stator motor according to claim 1, characterized in that, The motor stator (100) also includes two oil rings (2), which are respectively disposed at both ends of the stator core (1). Both oil rings (2) are provided with oil injection holes, which can spray oil onto the end windings protruding from the axial ends of the stator core (1).

3. The conjugate stator motor according to claim 2, characterized in that, The oil ring (2) includes a first oil ring (21) and a second oil ring (22). The first oil ring (21) and the second oil ring (22) are respectively disposed at both ends of the stator core (1). The second oil ring (22) and the head of the bolt (3) or the nut threadedly connected to the bolt (3) are located on the same side of the axial direction of the stator core (1). The second oil ring (22) is provided with a second oil ring bolt hole (223) for the bolt (3) to pass through. In the circumferential regions on both sides of the second oil ring bolt hole (223), the second oil ring (22) is solid and does not form a groove.

4. The conjugate stator motor according to claim 3, characterized in that, The surface of the second oil ring (22) facing the stator core (1) is provided with a plurality of arc grooves (221), the plurality of arc grooves (221) extending at intervals along the circumference (C) of the second oil ring (22), and the second oil ring bolt hole (223) is provided between two adjacent arc grooves (221).

5. The conjugate stator motor according to claim 3, characterized in that, The surface of the first oil ring (21) facing the stator core (1) forms an annular groove (215), which extends circumferentially (C) along the second oil ring (22). The first oil ring (21) is provided with a first oil ring bolt hole (213) through which the bolt (3) passes. The first oil ring bolt hole (213) is located at the bottom of the ring groove (215). The ring groove (215) includes a portion that bypasses the first oil ring bolt hole (213), thereby enabling the oil to flow circumferentially in the ring groove (215).

6. The conjugate stator motor according to claim 5, characterized in that, The first oil ring (21) is provided with an oil inlet (211), which is connected to the ring groove (215). There are multiple oil inlets (211), which are spaced apart on the circumference (C) of the first oil ring (21).

7. The conjugate stator motor according to claim 1, characterized in that, The stacked sheet group (11) includes a first stacked sheet group (11A) and a second stacked sheet group (11B). The first stacked sheet group (11A) is provided with the circumferential connecting hole (14), and the second stacked sheet group (11B) is not provided with the circumferential connecting hole (14). There are multiple first stacked sheet groups (11A), and two first stacked sheet groups (11A) are separated by the second stacked sheet group (11B).

8. The conjugate stator motor according to claim 7, characterized in that, The laminations at both ends of the stator core (1) are the second lamination group (11B).

9. The conjugate stator motor according to claim 1, characterized in that, The conjugate stator motor is a dual-rotor motor. The motor stator (100) of the dual-rotor motor includes an inner stator and an outer stator, and the inner stator and the outer stator share a stator core (1).

10. A vehicle powertrain system, characterized in that, The conjugate stator motor includes any one of claims 1 to 9.

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