Injection molded stator and electric oil pump

Abstract

The application provides an injection molded stator and an electric oil pump, and relates to the field of oil pumps. The injection molded stator has a first cooling oil channel and a rotor cavity, the first cooling oil channel has an inlet and an outlet, the injection molded stator comprises a stator core, at least part of the outer side wall of the stator core is exposed to the first cooling oil channel, and the outlet of the first cooling oil channel and the rotor cavity are communicated. The application can effectively improve the heat dissipation efficiency of the stator core and the coil, meet the high heat dissipation requirement in the miniaturization and light weight development of the electric oil pump, and prolong the service life of the oil pump.

Description

Technical Field

[0001] This application relates to the field of oil pumps, and more particularly to an injection-molded stator and an electric oil pump. Background Technology

[0002] Traditional electric oil pumps mostly employ an internal rotor structure, and in recent years, integrally molded stators have gradually become the mainstream in electric oil pumps. However, the low thermal conductivity of injection molding resin limits the heat dissipation capacity of the coils. To compensate for this deficiency, existing technologies propose introducing cooling oil into the motor rotor cavity for oil cooling. However, as electric oil pumps become smaller and lighter, the thermal load on the stator coils increases significantly, and the heat dissipation capacity of the aforementioned cooling structures is limited and can no longer meet the heat dissipation requirements, affecting the service life of the electric oil pump. Summary of the Invention

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide an injection-molded stator and an electric oil pump that can effectively improve the heat dissipation efficiency of the stator core and coil, meet the high heat dissipation requirements in the miniaturization and lightweight development of electric oil pumps, and extend the service life of the oil pump.

[0004] This application provides the following technical solution: In a first aspect, embodiments of this application provide an injection-molded stator, the injection-molded stator having a first cooling oil passage and a rotor cavity, the first cooling oil passage having an inlet and an outlet, the injection-molded stator comprising: The stator core has at least a portion of its outer sidewall exposed to the first cooling oil passage, the outlet of which is connected to the rotor cavity.

[0005] In some embodiments of the first aspect, along the axial direction of the stator core, the inlet of the first cooling oil passage is located at one end of the stator core, and the outlet of the first cooling oil passage is located at the other end of the stator core.

[0006] In some embodiments of the first aspect, the first cooling oil passage extends axially along the stator core.

[0007] In some embodiments of the first aspect, the number of the first cooling oil passages is at least two, and each of the first cooling oil passages is spaced apart. The ends of any two adjacent first cooling oil passages away from the rotor cavity are connected.

[0008] In some embodiments of the first aspect, the injection-molded stator includes: The injection molded housing includes an injection molded encapsulation body, one end of which covers the outer periphery of the stator core; wherein, a first cooling oil channel is formed between the outer wall of the stator core and the injection molded encapsulation body.

[0009] In some embodiments of the first aspect, the injection-molded stator further includes a coil, the stator core has stator teeth, the inner surface of the stator core is disposed on the side of the stator teeth facing the rotor cavity, the coil is wound on the stator teeth, an insulating element is disposed between the stator core and the coil, and the coil is embedded in the injection-molded package.

[0010] In some embodiments of the first aspect, the number of stator teeth is multiple, each stator tooth is arranged circumferentially along the stator core, and a tooth groove is formed between any two adjacent stator teeth; wherein, a portion of the injection-molded package is filled in the tooth groove.

[0011] In some embodiments of the first aspect, the injection-molded package includes a first injection-molded portion, a second injection-molded portion, a third injection-molded portion, and a plurality of the fourth injection-molded portions, wherein the first injection-molded portion covers one end of the stator core along the axial direction of the stator core, and the second injection-molded portion covers the other end of the stator core; Along the radial direction of the stator core, the third injection molding portion covers the outer side of the stator core, the fourth injection molding portion is located on the inner side of the stator core, and each of the tooth slots is filled with the fourth injection molding portion. The third injection molding portion is connected to the first injection molding portion and the second injection molding portion respectively, and the fourth injection molding portion is connected to the first injection molding portion and the second injection molding portion respectively.

[0012] In some embodiments of the first aspect, the injection-molded stator further includes a grounding terminal, the injection-molded package has a flange portion on which a conductive bushing is mounted, one end of the grounding terminal is located inside the injection-molded package and connected to the conductive bushing; the end of the grounding terminal away from the conductive bushing is exposed outside the injection-molded package.

[0013] Secondly, embodiments of this application also provide an electric oil pump, the electric oil pump including the injection-molded stator as described in any of the above embodiments.

[0014] The embodiments of this application have the following advantages: This application provides an injection-molded stator in which the outer wall of the stator core is directly exposed to the first cooling oil channel. The cooling oil can directly contact the core for heat exchange without passing through the injection molding resin layer, which greatly reduces the thermal resistance and effectively overcomes the problem of limited coil heat dissipation caused by the low thermal conductivity of the injection molding resin. This meets the high heat load requirements under the trend of miniaturization and lightweighting.

[0015] Furthermore, the outlet of the first cooling oil passage is connected to the rotor cavity. After absorbing the heat from the stator, the cooling oil can enter the rotor cavity to cool the rotor and stator core, realizing series cooling of the stator and rotor. No additional cooling pipes are required, which is conducive to miniaturization of the overall size of the oil pump.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This illustration shows a schematic structural diagram of an injection-molded stator according to an embodiment of this application from one perspective; Figure 2 This invention provides a schematic structural diagram of an injection-molded stator from another perspective, according to an embodiment of the present application. Figure 3 This illustration shows a structural schematic diagram of an injection-molded stator provided in one embodiment of the present application from another perspective; Figure 4 This invention provides a schematic structural diagram of an injection-molded stator from another perspective, according to an embodiment of the present application. Figure 5 This invention provides a schematic structural diagram of a stator core according to an embodiment of the present application from one perspective. Figure 6 A schematic diagram of the structure of an insulating member provided in an embodiment of this application is shown from one perspective.

[0019] Explanation of key component symbols: 110-Rotor cavity; 120-First cooling oil passage; 130-Stator core; 131-Stator tooth; 132-Gate groove; 140-Third injection molding section; 150-First injection molding section; 160-Conductive bushing; 170-Second injection molding section; 180-Grounding terminal; 190-Insulating component; 200-Coil; 210-Fourth injection molding section. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] As shown in Figure 1, Figure 2 and Figure 3As shown, this application embodiment provides an injection-molded stator having a first cooling oil channel 120 and a rotor cavity 110. The first cooling oil channel 120 has an inlet and an outlet. The injection-molded stator includes a stator core 130. At least a portion of the outer sidewall of the stator core 130 is exposed in the first cooling oil channel 120. The outlet of the first cooling oil channel 120 is connected to the rotor cavity 110.

[0026] In these embodiments, the stator core 130 is the core component of the injection-molded stator. The overall structure has two major fluid channel structures: the first cooling oil channel 120 and the rotor cavity 110. This is intended to solve the technical problem that existing plastic-coated injection-molded stators have poor thermal conductivity of injection molding resin and insufficient heat dissipation capacity of traditional rotor cavity 110 oil cooling structure, which cannot meet the high heat dissipation requirements of miniaturization and lightweighting of oil pumps, resulting in short service life of oil pumps.

[0027] The injection-molded stator is the core component of the electric oil pump motor. The rotor cavity 110 is a hollow cavity housing the motor rotor and serves as the core space for the motor's rotation and operation. The first cooling oil channel 120 is an independent cooling fluid flow channel specifically designed to introduce cooling oil for active heat dissipation. The stator core 130, as the core component for stator magnetic conduction and heat generation, has its outer wall at least partially exposed within the internal space of the first cooling oil channel 120, allowing the metal heat-conducting surface of the stator core 130 to directly contact and exchange heat with the cooling oil. Simultaneously, the outlet of the first cooling oil channel 120 connects to the interior of the rotor cavity 110, utilizing the cooling oil to further cool the inner surface of the stator core 130, forming a complete cooling oil flow loop. In actual operation, external cooling oil flows into the channel from the inlet of the first cooling oil passage 120, directly flushing the exposed outer wall of the stator core 130. This quickly removes the Joule heat and hysteresis loss heat generated during the operation of the stator core 130. After heat exchange, the oil flows into the rotor cavity 110 through the outlet, simultaneously providing auxiliary heat dissipation for the rotor and stator structures. Finally, the oil returns to the oil pump circuit system to complete the circulation. For example, the first cooling oil passage 120 can adopt a hollowed-out or slotted structure.

[0028] Obviously, by directly exposing the outer wall of the stator core 130 to the first cooling oil channel 120, the cooling oil can directly contact the core for heat exchange without passing through the injection molding resin layer, which greatly reduces the thermal resistance and effectively overcomes the problem of limited heat dissipation of the coil 200 caused by the low thermal conductivity of the injection molding resin, thus meeting the high heat load requirements under the trend of miniaturization and lightweighting.

[0029] Furthermore, the outlet of the first cooling oil passage 120 is connected to the rotor cavity 110. After absorbing the heat of the stator, the cooling oil can enter the rotor cavity 110 to cool the rotor and stator core 130, realizing series cooling of the stator and rotor. No additional cooling pipes are required, which is conducive to miniaturization of the overall size of the oil pump.

[0030] like Figure 1 and Figure 2 As shown, in some embodiments, along the axial direction of the stator core 130, the inlet of the first cooling oil channel 120 is located at one end of the stator core 130, and the outlet of the first cooling oil channel 120 is located at the other end of the stator core 130.

[0031] In these embodiments, the effective heat exchange path between the cooling oil and the stator core 130 is extended by the axially arranged inlet and outlet layout, so as to achieve uniform axial heat dissipation of the stator core 130, further improve the overall heat dissipation efficiency, and at the same time ensure that the axial temperature field of the stator core 130 is uniform and stable.

[0032] like Figure 2 and Figure 3 As shown, in some embodiments, the first cooling oil passage 120 extends along the axial direction of the stator core 130.

[0033] In these embodiments, the overall extension shape of the first cooling oil passage 120 is defined to further optimize the smoothness of oil flow and reduce heat loss.

[0034] The first cooling oil passage 120 extends linearly along the axial direction of the stator core 130, with its direction parallel to the central axis of the stator core 130, without any bends or detours. This regular straight-channel structure allows the cooling oil to maintain a uniform, straight flow within the passage, avoiding the eddies and turbulence caused by traditional bends in the oil passage. This significantly reduces oil flow resistance and improves the circulation flow rate and efficiency of the cooling oil. Furthermore, the straight-line oil passage forming process is simpler.

[0035] like Figure 2 and Figure 3 As shown, in some embodiments, there are at least two first cooling oil passages 120, and each first cooling oil passage 120 is spaced apart. The ends of any two adjacent first cooling oil passages 120 away from the rotor cavity 110 are connected.

[0036] In these embodiments, the number and connection structure of the first cooling oil passages 120 are defined to achieve uniform heat dissipation at multiple points and further improve the overall heat dissipation capacity.

[0037] At least two first cooling oil channels 120 are provided, and the multiple first cooling oil channels 120 are evenly spaced along the circumference of the stator core 130 to ensure that there is a corresponding cooling and heat dissipation area in each circumferential direction of the stator core 130. At the same time, the ends of any two adjacent first cooling oil channels 120 away from the rotor cavity 110 are connected to each other to form an integrally connected cooling oil circuit.

[0038] For example, an annular oil passage groove is opened at the axial end of the stator core 130 to connect all adjacent oil passage ends in series, resulting in high oil circuit integration and uniform flow distribution. Alternatively, adjacent oil passage ends can be connected by an external thin oil passage pipe, which has strong structural adaptability and can be adapted to stator cores 130 of different sizes.

[0039] During operation, the cooling oil enters from the main inlet and is then distributed to various independent first cooling oil channels 120 through a connecting structure. It simultaneously exchanges heat at multiple locations around the stator core 130 before finally converging into the rotor cavity 110. This interconnected oil circuit enables automatic and balanced oil distribution, avoiding heat dissipation differences caused by uneven flow in single channels and further improving heat dissipation stability.

[0040] like Figure 3 As shown, in some embodiments, the injection-molded stator includes an injection-molded shell, the injection-molded shell includes an injection-molded package, one end of which covers the outer periphery of the stator core 130. A first cooling oil channel 120 is formed between the outer wall of the stator core 130 and the injection-molded package.

[0041] In these embodiments, the injection shell structure of the injection-molded stator and the molding method of the first cooling oil channel 120 are defined, and the molding carrier and structural composition of the oil channel are clarified.

[0042] The injection molded shell is mainly composed of an injection molded encapsulation body. It is made of insulating engineering plastic through an integrated injection molding process. The material can be high-temperature resistant insulating injection molding materials such as PA66 and PBT, which have the basic functions of insulation, heat insulation and structural support.

[0043] One end of the injection-molded package is wrapped and attached to the outer periphery of the stator core 130, achieving positioning, fixation, and insulation encapsulation of the stator core 130. At the same time, through the injection molding reserved gap structure, a hollow first cooling oil channel 120 is directly formed between the exposed outer wall of the stator core 130 and the inner wall of the injection-molded package, without the need for additional pipe fittings, resulting in a high degree of structural integration.

[0044] For example, during injection molding, space for oil channels is reserved through mold inserts, and the complete oil channels are formed directly after molding. Alternatively, the entire injection molding process can be completed first, and then the oil channels can be machined on the bonding surface.

[0045] This embodiment directly forms the cooling oil channels by fitting the injection-molded package with the stator core 130, eliminating the need for additional cooling pipe assembly. This simplifies the overall assembly structure of the injection-molded stator and reduces assembly costs. Simultaneously, the integrated molding structure provides excellent sealing, effectively preventing cooling oil leakage and ensuring stable operation of the cooling oil circuit. Furthermore, the exposed core structure enables efficient heat exchange, balancing structural compactness with excellent heat dissipation performance.

[0046] like Figure 3 , Figure 4, Figure 5 and Figure 6 As shown, in some embodiments, the injection-molded stator also includes a coil 200, a stator core 130 having stator teeth 131, an inner side of the stator core 130 being disposed on the side of the stator teeth 131 facing the rotor cavity 110, the coil 200 being wound on the stator teeth 131, an insulating member 190 being disposed between the stator core 130 and the coil 200, and the coil 200 being embedded in the injection-molded package.

[0047] In these embodiments, the overall composition of the injection-molded stator is further improved, and the assembly structure and positional relationship of the coil 200 and the insulating component 190 are defined to achieve the adaptation of the insulation protection and heat dissipation structure.

[0048] The stator core 130 has stator teeth 131 integrally formed on its inner side. The side of the stator teeth 131 facing the rotor cavity 110 is the inner side of the stator core 130. The coil 200 is made of enameled copper wire and is tightly wound on the outer side of each stator tooth 131. It is the core component for electromagnetic induction and heat generation of the motor. To ensure electrical insulation safety, an insulating component 190 is placed between the stator core 130 and the coil 200. The insulating component 190 can be insulating paper or insulating plastic sleeve, etc.

[0049] In terms of overall structure, the coil 200 is completely embedded inside the injection-molded package, which provides fixed encapsulation and dust and moisture protection. The outer wall of the stator core 130 is exposed to the cooling oil channels, forming a differentiated structure of inner insulation encapsulation and outer oil-cooled heat exchange. During operation, the heat generated by the coil 200 can be quickly conducted to the entire stator core 130 through the stator teeth 131, and then dissipated by heat exchange with the cooling oil on the outer wall of the first cooling oil channel 120 and the inner wall of the rotor cavity 110.

[0050] like Figure 4 and Figure 5 As shown, in some embodiments, there are multiple stator teeth 131, each stator tooth 131 is arranged at intervals along the circumference of the stator core 130, and a groove 132 is formed between any two adjacent stator teeth 131. The injection-molded package portion is filled in the groove 132.

[0051] In these embodiments, multiple stator teeth 131 are provided, and all stator teeth 131 are evenly spaced along the circumference of the stator core 130. The gap between two adjacent stator teeth 131 forms a hollowed-out groove 132 structure. During the injection molding process, some plastic material automatically fills into the groove 132, completely filling the originally hollowed-out groove 132. For example, the plastic completely fills the space of the groove 132, resulting in a strong overall structure and good shock resistance.

[0052] By using the injection-molded filling structure of the tooth grooves 132, the dispersed stator teeth 131 are connected into a whole, which greatly improves the overall structural strength and rigidity of the stator core 130 and effectively reduces the noise and deformation caused by electromagnetic vibration during motor operation. At the same time, the filled injection-molded body can help fix the coil 200 wound on the stator teeth 131, preventing the coil 200 from loosening or shifting, improving structural stability, and the dense injection-molded layer can help conduct local heat of the coil 200.

[0053] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the injection-molded package includes a first injection-molded portion 150, a second injection-molded portion 170, a third injection-molded portion 140 and a plurality of fourth injection-molded portions 210. Along the axial direction of the stator core 130, the first injection-molded portion 150 covers one end of the stator core 130 and the second injection-molded portion 170 covers the other end of the stator core 130. Along the radial direction of the stator core 130, the third injection molding part 140 covers the outer side of the stator core 130, the fourth injection molding part 210 is located on the inner side of the stator core 130, and each tooth groove 132 is filled with the fourth injection molding part 210. The third injection molding part 140 is connected to the first injection molding part 150 and the second injection molding part 170 respectively, and the fourth injection molding part 210 is connected to the first injection molding part 150 and the second injection molding part 170 respectively.

[0054] In these embodiments, the integral injection-molded package is divided into four modular structures: a first injection molding part 150, a second injection molding part 170, a third injection molding part 140, and multiple fourth injection molding parts 210. Each structure is integrally injection molded and seamlessly connected.

[0055] Along the axial direction of the stator core 130, the first injection molding part 150 fully covers one end face of the stator core 130 in the axial direction, and the second injection molding part 170 fully covers the other end face of the stator core 130 in the axial direction, so as to achieve sealing protection and fixation at both ends of the core.

[0056] Along the radial direction of the stator core 130, the third injection molding part 140 covers the outer non-heat exchange area of ​​the stator core 130, leaving only the core area of ​​the outer wall of the core exposed to the first cooling oil passage 120; multiple fourth injection molding parts 210 correspond to the positions of each tooth groove 132 and fill the inside of the tooth groove 132 one by one.

[0057] In terms of structural connection, the two ends of the third injection part 140 on the outer side are seamlessly connected to the first injection part 150 and the second injection part 170 respectively, and the two ends of the fourth injection part 210 at the inner tooth groove 132 are also integrally connected to the first injection part 150 and the second injection part 170 respectively, forming an integral injection frame with inner and outer closed loops.

[0058] This implementation improves structural strength through modular design, with each injection molding part seamlessly connected, effectively resisting structural failure under high temperature and vibration conditions, and significantly enhancing the working stability and service life of the injection molded stator.

[0059] like Figure 3 As shown, in some embodiments, the injection-molded stator further includes a grounding terminal 180. The injection-molded package has a flange portion, on which a conductive bushing 160 is mounted. One end of the grounding terminal 180 is located inside the injection-molded package and connected to the conductive bushing 160. The end of the grounding terminal 180 away from the conductive bushing 160 is exposed outside the injection-molded package.

[0060] In these embodiments, the outer side of the injection-molded package has an integrally formed flange portion, which serves as the mounting reference structure for stator assembly and positioning. The conductive bushing 160 is made of a highly conductive metal such as copper and is interference-fitted and fixed in the preset mounting hole of the flange portion, ensuring firm fixation and stable conductivity.

[0061] For example, the conductive bushing 160 is used to pass through the mounting bolt.

[0062] The grounding terminal 180 is a metal conductive component, formed using a pre-embedded injection molding process. One end is pre-embedded and fixed inside the injection-molded package, and is in close contact with the conductive bushing 160 to achieve electrical conductivity. The other end extends outward and is exposed outside the injection-molded package for connecting an external grounding line. For example, the grounding terminal 180 is electrically connected to the control board of the electric oil pump to achieve grounding.

[0063] The conductive bushing 160 can be a cylindrical bushing or a sheet-like inlaid bushing.

[0064] Obviously, the combination of the built-in grounding terminal 180 and the conductive bushing 160 enables reliable grounding of the injection-molded stator, which can quickly discharge the induced static electricity and leakage current generated during the operation of the stator, avoiding the problems of static electricity accumulation and leakage current breakdown of the insulation structure, and greatly improving the electrical safety performance of the electric oil pump motor. At the same time, the pre-embedded structure does not require post-assembly, has a compact structure and reliable connection, and is suitable for the miniaturization design requirements of oil pumps.

[0065] In some embodiments, this application also provides an electric oil pump, which includes an injection-molded stator as described in any of the above embodiments.

[0066] In these embodiments, injection-molded stators are applied to electric oil pumps to solve the technical problems of poor heat dissipation, short lifespan, and low reliability of traditional electric oil pumps.

[0067] The rotor is mounted in the rotor cavity 110 of the injection-molded stator, forming a motor-driven structure with the stator. The pump core assembly is connected to the rotor drive, and the oil pump operates by being driven by the motor. The cooling oil circuit system of the oil pump is connected to the first cooling oil passage 120 of the injection-molded stator, allowing the hydraulic oil used by the oil pump to be continuously circulated into the first cooling oil passage 120 as a cooling medium. Efficient heat dissipation is achieved by relying on the exposed heat exchange structure of the stator core 130. The oil after heat exchange flows back to the pump body oil circuit, simultaneously completing the cooling of the rotor cavity 110 and the oil circuit circulation.

[0068] By incorporating a high-heat-dissipation injection-molded stator, the problem of insufficient heat dissipation under high heat load in miniaturized oil pumps is fundamentally solved, effectively reducing the operating temperature rise of the motor, reducing the high-temperature aging loss of the stator and coils, and significantly improving the stability and service life of the oil pump during long-term continuous operation. At the same time, the integrated injection-molded structure of the stator is compact and easy to assemble, which can effectively reduce the overall size and production cost of the oil pump.

[0069] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0070] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. An injection-molded stator, characterized in that, The injection-molded stator has a first cooling oil passage (120) and a rotor cavity (110), the first cooling oil passage (120) having an inlet and an outlet, and the injection-molded stator includes: The stator core (130) has at least a portion of its outer sidewall exposed to the first cooling oil passage (120), the outlet of which is connected to the rotor cavity (110).

2. The injection-molded stator according to claim 1, characterized in that, Along the axial direction of the stator core (130), the inlet of the first cooling oil channel (120) is located at one end of the stator core (130), and the outlet of the first cooling oil channel (120) is located at the other end of the stator core (130).

3. The injection-molded stator according to claim 2, characterized in that, The first cooling oil passage (120) extends along the axial direction of the stator core (130).

4. The injection-molded stator according to claim 2 or 3, characterized in that, The number of the first cooling oil passages (120) is at least two, and each of the first cooling oil passages (120) is arranged at intervals; The ends of any two adjacent first cooling oil passages (120) away from the rotor cavity (110) are connected.

5. The injection-molded stator according to claim 1, characterized in that, The injection-molded stator includes: The injection molded housing includes an injection molded encapsulation body, one end of which covers the outer periphery of the stator core (130); wherein, the first cooling oil channel (120) is formed between the outer wall of the stator core (130) and the injection molded encapsulation body.

6. The injection-molded stator according to claim 5, characterized in that, The injection-molded stator also includes a coil (200), the stator core (130) has stator teeth (131), the inner side of the stator core (130) is disposed on the side of the stator teeth (131) facing the rotor cavity (110), the coil (200) is wound on the stator teeth (131), an insulating element (190) is disposed between the stator core (130) and the coil (200), and the coil (200) is embedded in the injection-molded package body.

7. The injection-molded stator according to claim 6, characterized in that, The number of stator teeth (131) is multiple, and each stator tooth (131) is arranged at intervals along the circumference of the stator core (130), and a tooth groove (132) is formed between any two adjacent stator teeth (131); wherein, part of the injection molded package is filled in the tooth groove (132).

8. The injection-molded stator according to claim 7, characterized in that, The injection-molded package includes a first injection-molded part (150), a second injection-molded part (170), a third injection-molded part (140), and a plurality of fourth injection-molded parts (210). Along the axial direction of the stator core (130), the first injection-molded part (150) covers one end of the stator core (130), and the second injection-molded part (170) covers the other end of the stator core (130). Along the radial direction of the stator core (130), the third injection molding part (140) covers the outer side of the stator core (130), the fourth injection molding part (210) is located on the inner side of the stator core (130), and each of the tooth grooves (132) is filled with the fourth injection molding part (210). The third injection molding part (140) is connected to the first injection molding part (150) and the second injection molding part (170) respectively, and the fourth injection molding part (210) is connected to the first injection molding part (150) and the second injection molding part (170) respectively.

9. The injection-molded stator according to claim 5, characterized in that, The injection-molded stator also includes a grounding terminal (180). The injection-molded package has a flange portion, on which a conductive bushing (160) is mounted. One end of the grounding terminal (180) is located inside the injection-molded package and is connected to the conductive bushing (160). The end of the grounding terminal (180) away from the conductive bushing (160) is exposed outside the injection-molded package.

10. An electric oil pump, characterized in that, The electric oil pump includes the injection-molded stator as claimed in any one of claims 1 to 9.

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