Electric motor, electronic water pump and vehicle

Abstract

The application discloses a motor, an electronic water pump and a vehicle, and the motor comprises a stator assembly, a stator injection body and a casing injection body, the stator injection body is formed by one-time injection to at least partially cover the stator assembly, the casing injection body is formed by two-time injection to cover the stator injection body, the stator injection body is provided with a positioning hole at a first end in the axial direction, and the casing injection body comprises a top wall, a bottom wall, an outer peripheral wall and an inner peripheral wall, the top wall is provided with a matching part which is matched in the positioning hole. According to the motor provided in the embodiment of the application, the matching part and the positioning hole are matched to realize positioning when the casing injection body is subjected to two-time injection, the matching part which is combined with the positioning hole is formed after the material solidifies when the matching part is withdrawn from the positioning hole, slight cracks generated due to poor fusion of the fusion part between the stator injection body and the casing injection body can be effectively avoided, the connection strength between the stator injection body and the casing injection body is enhanced, and the service life of the whole product is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic water pumps, in particular to an electric machine, an electronic water pump having the electric machine, and a vehicle having the electronic water pump. BACKGROUND

[0002] In the related art, the injection molding mode of separately injection molding the stator injection body and the casing injection body (two-time injection molding) has certain advantages and is widely used. For example, by using the above two-time injection molding mode, the strength of the casing injection body can be ensured, the material cost can be saved, the volume of the stator injection body can be smaller, the injection molding time is shortened, and the winding and other components inside the stator injection body can be prevented from being damaged during injection molding, thereby ensuring the performance reliability of the electronic water pump. SUMMARY

[0003] The present application is made based on the findings and recognitions of the inventors on the following facts and problems:

[0004] The inventors have found through research that, in order to ensure the above advantages of two-time injection molding in the related art, the casing injection body is often made of thermoplastic engineering plastic, and the stator injection body is often made of thermosetting plastic. Since two types of plastic materials are used, the thickness of the plastic materials is not uniform, and in some areas where the plastic is thin (such as the inner circumferential wall of the casing injection body), deformation, bulging, and underfilling of the injection plastic caused by uneven cooling may occur.

[0005] In addition, the inventors have found through research that, during two-time injection molding, the compatibility of the molten second thermoplastic engineering plastic and the thermosetting plastic of the first injection body (stator injection body) is different, and the interface position of the two is prone to poor fusion, which causes microcracks at the fusion position, affects the strength of the electronic water pump, and when the water pump is running, if water flows through the fusion position, the water flow is likely to seep into the motor through the cracks, causing the risk of water leakage, thereby reducing the performance reliability of the electronic water pump.

[0006] The present application aims to at least partially solve one of the technical problems in the related art.

[0007] To this end, an embodiment of one aspect of the present application proposes an electric machine that can improve the uniformity and flowability of material filling during two-time injection molding, has good combined effects, and improves the combined strength of the two injection bodies.

[0008] The motor according to the first aspect of the embodiments of the present application comprises: a stator assembly; a stator injection body formed by one-time injection to at least partially cover the stator assembly, the stator injection body having a ring-shaped cross section, the stator injection body being provided with a positioning hole at a first end thereof in an axial direction, the positioning hole extending from a first end surface of the stator injection body to a second end thereof; and a casing injection body formed by two-time injection to cover the stator injection body, the casing injection body comprising a top wall, a bottom wall, an outer peripheral wall and an inner peripheral wall, the stator injection body being located in a cavity formed by the top wall, the bottom wall, the outer peripheral wall and the inner peripheral wall, the top wall being provided with a fitting portion, the top wall comprising a first side surface adjacent to the bottom wall, the fitting portion protruding from the first side surface towards the bottom wall, and the fitting portion being fitted in the positioning hole.

[0009] According to the motor of the embodiments of the present application, when the casing injection body is subjected to two-time injection, the positioning can be completed by fitting the insert and the positioning hole after the insert enters the positioning hole, and when the insert exits the positioning hole during the two-time injection, the two-time injection material naturally flows into the positioning hole, and the fitting portion combined with the positioning hole is formed after the material solidifies, so that the fine cracks caused by poor fusion of the fusion portion between the stator injection body and the casing injection body can be effectively avoided, the connection strength between the stator injection body and the casing injection body is enhanced, and the service life of the product as a whole is increased.

[0010] In some embodiments, the cross-sectional area of the positioning hole gradually decreases along the extension direction thereof, and the fitting portion gradually decreases along the protruding direction thereof.

[0011] In some embodiments, the cross-sectional area of the positioning hole is constant along the extension direction thereof, and the fitting portion is constant along the protruding direction thereof.

[0012] In some embodiments, the positioning hole comprises a first segment and a second segment arranged in sequence along the extension direction thereof, the cross-sectional area of the first segment gradually decreases along the extension direction of the positioning hole, the cross-sectional area of the second segment is constant along the extension direction of the positioning hole, the fitting portion comprises a first fitting portion and a second fitting portion arranged in sequence along the protruding direction thereof, the first fitting portion is fitted in the first segment, the second fitting portion is fitted in the second segment, the cross-sectional area of the first fitting portion gradually decreases along the protruding direction of the fitting portion, and the cross-sectional area of the second fitting portion is constant along the protruding direction of the fitting portion.

[0013] In some embodiments, the first segment is a conical hole, the second segment is a circular hole, and the outer peripheral contour of the cross section of the first fitting portion and the outer peripheral contour of the cross section of the second fitting portion are both circular.

[0014] In some embodiments, the positioning hole is multiple, and a cross-sectional area of a second section of one of the positioning holes is different from cross-sectional areas of second sections of the rest of the positioning holes.

[0015] In some embodiments, an inner circumferential surface of the stator injection body is provided with a first groove, and an outer circumferential surface of the inner circumferential wall is provided with a protrusion which is fitted in the first groove.

[0016] In some embodiments, the first groove extends along an axial direction of the stator injection body, and the protrusion extends along an axial direction of the casing injection body.

[0017] In some embodiments, the first groove is multiple, and the multiple first grooves are arranged along a circumferential direction of the stator injection body, and the protrusion is multiple, and the multiple protrusions are arranged along a circumferential direction of the casing injection body.

[0018] In some embodiments, the stator assembly comprises: a stator core; an insulation frame which is arranged at an end of the stator core in an axial direction of the stator core; multiple pins which are arranged at intervals, and one end of at least part of the multiple pins is connected to the insulation frame; a winding which is wound on a tooth portion of the stator core, and an outgoing line of the winding is connected to the at least part of the pins; and the stator injection body covers one end of the multiple pins, the winding, the insulation frame and the stator core, and the other end of the multiple pins penetrates through the stator injection body and the casing injection body.

[0019] In some embodiments, an outer circumferential surface of the stator core is provided with a second groove, and one end of one of the multiple pins is fitted in the second groove.

[0020] In some embodiments, a fixing plate is further included, the fixing plate is arranged on the insulation frame, a part of the fixing plate is located in the stator injection body, another part of the fixing plate is located in the casing injection body, and the other end of the multiple pins penetrates through the stator injection body, the fixing plate and the casing injection body in sequence.

[0021] In some embodiments, the material of the stator injection body is a thermosetting material, the material of the insulation frame and the material of the fixing plate are thermoplastic plastics, the curing temperature of the thermosetting material is lower than the softening temperature of the thermoplastic material, and the thermal decomposition temperature of the thermosetting material is greater than the injection temperature of the casing injection body.

[0022] The electronic water pump according to the embodiments of the second aspect of the present application comprises the motor according to any one of the above embodiments.

[0023] The vehicle according to the third aspect of the embodiments of the present application comprises the electronic water pump according to any one of the above embodiments. In the vehicle according to the embodiments of the present application, the electronic water pump can improve the uniformity and flowability of the material filling during the secondary injection, has a good combination effect, and improves the combination strength of the twice-injected body. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a sectional view of the electronic water pump according to the embodiments of the present application.

[0025] Figure 2 is a structural schematic view of the stator injection body according to the embodiments of the present application.

[0026] Figure 3 is a structural schematic view of the casing injection body according to the embodiments of the present application.

[0027] Figure 4 is a schematic view of the cross section of the electronic water pump according to the embodiments of the present application.

[0028] Figure 5 is a structural schematic view of the fixing plate according to the embodiments of the present application.

[0029] Figure 6 is Figure 5 is a side view of the fixing plate.

[0030] LIST OF REFERENCE NUMBERS

[0031] stator assembly 100, stator core 101, pin 102, winding 103, fixing plate 104, insulation frame 105;

[0032] body 1041, first boss 1042, second boss 1043, protruding part 1044, through hole 1045, first end surface 1046, second end surface 1047, first side surface 1048, second side surface 1049, first circular platform part 10421, second circular platform part 10422, third circular platform part 10423, first connecting part 10424, second connecting part 10425;

[0033] stator injection body 200, first groove 201, positioning hole 202, first section 2021, second section 2022;

[0034] casing injection body 300, protrusion 301, fitting part 302, first fitting part 3021, second fitting part 3022, top wall 303, bottom wall 304, outer peripheral wall 305, inner peripheral wall 306. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described below in detail with reference to examples shown in the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0036] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] The following description, with reference to the accompanying drawings, describes an electric motor, an electric water pump, and a vehicle according to embodiments of the present invention.

[0042] The following is a reference appendix. Figures 1-6 A motor according to an embodiment of the present invention is described.

[0043] like Figures 1-6 As shown, the motor according to an embodiment of the present invention includes a stator assembly 100, a stator injection molded body 200, and a housing injection molded body 300.

[0044] The stator injection molding body 200 is formed by injection molding in one step to at least partially cover the stator assembly 100. The cross-section of the stator injection molding body 200 is annular. The stator injection molding body 200 has a positioning hole 202 at its first axial end. The positioning hole 202 extends from the first end of the stator injection molding body 200 toward the second end of the stator injection molding body 200.

[0045] The housing injection body 300 is formed by secondary injection molding to cover the stator injection body 200. The housing injection body 300 includes a top wall 303, a bottom wall 304, an outer peripheral wall 305, and an inner peripheral wall 306. The stator injection body 200 is located in the cavity formed by the top wall 303, the bottom wall 304, the outer peripheral wall 305, and the inner peripheral wall 306. The top wall 303 is provided with a mating part 302. The top wall 303 includes a first side surface adjacent to the bottom wall 304. The mating part 302 protrudes from the first side surface toward the bottom wall 304 and fits into the positioning hole 202.

[0046] According to the motor of the embodiment of the present application, when the insert enters the positioning hole 202, the positioning can be completed through the cooperation of the insert and the positioning hole 202, and when the insert exits the positioning hole 202 during the secondary injection molding, the secondary injection material naturally flows into the positioning hole 202, and the material forms the cooperation part 302 combined with the positioning hole 202 after solidification, so that the fine cracks caused by poor fusion of the fusion part between the stator injection body 200 and the motor housing injection body 300 can be effectively avoided, the connection strength between the stator injection body 200 and the motor housing injection body 300 is enhanced, and the service life of the whole product is prolonged.

[0047] In some embodiments, the cross-sectional area of the positioning hole 202 gradually decreases along the extension direction thereof, and the cooperation part 302 gradually decreases along the protruding direction thereof; or the cross-sectional area of the positioning hole 202 is constant along the extension direction thereof, and the cooperation part 302 is constant along the protruding direction thereof.

[0048] According to the motor of the embodiment of the present application, when the cross-sectional area of the positioning hole 202 gradually decreases along the extension direction thereof, the material injected secondarily will cover the insert located in the positioning hole 202 during the secondary injection molding, and when the insert exits the positioning hole 202, the material covering the insert can naturally fill the space caused by the exit of the insert from the positioning hole 202, and air can be completely prevented from entering the positioning hole 202, so that the connection strength between the stator injection body 200 and the motor housing injection body 300 is enhanced.

[0049] In some embodiments, as shown in Figure 2 and Figure 3 The positioning hole 202 comprises a first segment 2021 and a second segment 2022 arranged in sequence along the extension direction thereof, the cross-sectional area of the first segment 2021 gradually decreases along the extension direction of the positioning hole 202, and the cross-sectional area of the second segment 2022 is constant along the extension direction of the positioning hole 202.

[0050] The cooperation part 302 comprises a first cooperation part 3021 and a second cooperation part 3022 arranged in sequence along the protruding direction thereof, the first cooperation part 3021 is fitted in the first segment 2021, the second cooperation part 3022 is fitted in the second segment 2022, the cross-sectional area of the first cooperation part 3021 gradually decreases along the protruding direction of the cooperation part 302, and the cross-sectional area of the second cooperation part 3022 is constant along the protruding direction of the cooperation part 302.

[0051] According to the motor of the embodiment of the present application, since the cross-sectional area of the first end of the first section 2021 is larger than that of the second end of the first section 2021, the secondary injection material flows into the first section 2021, when the secondary material fills the first section 2021, the insert begins to exit the second section 2022, when the insert completely exits the second section 2022, the secondary injection material in the first section 2021 naturally flows into the second section 2022, effectively preventing air from entering the second section 2022, avoiding uneven condensation of the secondary injection material when condensing to produce fine cracks to increase the service life of the shell injection body 300

[0052] In some embodiments, according to the shape of the insert, the first section 2021 and the second section 2022 can also be square holes, circular holes, conical holes or other shaped holes with the same or different cross-sectional sizes, the first fitting part 3021 and the second fitting part 3022 are cuboids, cylinders, cones or other three-dimensional shapes that cooperate with the first section 2021 and the second section 2022, preferably, the first section 2021 is a conical hole, the second section 2022 is a circular hole, the outer peripheral contour of the cross section of the first fitting part 3021 and the outer peripheral contour of the cross section of the second fitting part 3022 are both circular, the first fitting part 3021 is a circular truncated cone cooperating with the first section 2021, and the second fitting part 3022 is a circular cylinder cooperating with the second section 2022, when the first section 2021 is a conical hole and the second section 2022 is a circular hole, the first section 2021 and the second section 2022 are simple to process and can make the secondary material flow from the first section 2021 to the first section 2021 more smoothly.

[0053] In some embodiments, the inner peripheral surface of the stator injection body 200 is provided with a first groove 201, and the outer peripheral surface of the inner peripheral wall 306 is provided with a protrusion 301, and the protrusion 301 is fitted in the first groove 201.

[0054] According to the motor of the embodiment of the present application, when the secondary injection material flows along the first groove 201 on the inner circumferential surface of the stator injection body 200 during the secondary injection of the casing injection body 300, the first groove 201 can increase the cross-sectional area of the secondary injection material on the inner circumferential surface of the stator injection body 200, thereby reducing the flow speed of the secondary injection material on the inner circumferential surface of the stator injection body 200, reducing the loss of the injection pressure of the secondary injection material on the inner circumferential surface of the stator injection body 200, and reducing the shear stress of the secondary injection material, improving the internal stress of the secondary injection material at the inner circle of the product, thereby reducing the risk of deformation of the secondary injection body at the inner circle position due to the large stress residual, and at the same time, due to the first groove 201, the contact area of the secondary injection material with the inner circumferential surface of the stator injection body 200 is increased, and during the secondary injection, the outer circumferential surface of the inner circumferential wall 306 of the casing injection body 300 forms a protrusion 301 corresponding to the first groove 201 on the inner circumferential surface of the stator injection body 200, which strengthens the connection strength of the casing injection body 300 and the stator injection body 200 while increasing the thickness of the casing injection body 300 at the first groove 201, increasing the overall strength of the casing injection body 300, and when the secondary injection material flows in the first groove 201, the cooling speed of the secondary injection material in the first groove 201 is slow, which can ensure the injection effect of the secondary injection material and prevent underfilling during the secondary injection process.

[0055] In some embodiments, the first groove 201 extends in the axial direction of the stator injection body 200, and the protrusion 301 extends in the axial direction of the casing injection body 300.

[0056] According to the motor of the embodiment of the present application, the first groove 201 extends in the axial direction of the stator injection body 200, and during the secondary injection, the secondary injection material flows along the first groove 201, increasing the contact area of the secondary injection material with the inner circumferential surface of the stator injection body 200, thereby reducing the flow speed of the secondary injection material, and when the secondary injection material flows in the first groove 201, the cooling speed of the secondary injection material is slowed down, which can ensure that the secondary injection material will not cool down during the secondary injection process, causing underfilling and other phenomena.

[0057] In some embodiments, the first groove 201 is a plurality of first grooves 201, and the plurality of first grooves 201 are arranged in the circumferential direction of the stator injection body 200, the protrusion 301 is a plurality of protrusions 301, and the plurality of protrusions 301 are arranged in the circumferential direction of the casing injection body 300, and the plurality of protrusions 301 are correspondingly matched in the plurality of first grooves 201.

[0058] According to the motor of the embodiment of the present application, by providing a plurality of first grooves 201 and protrusions 301, the thickness at the first groove 201 can be further increased, the connection strength of the stator injection body 200 and the casing injection body 300 is increased, thereby increasing the overall strength and enhancing the service life of the product.

[0059] In some embodiments, the stator assembly 100 comprises a stator core 101, an insulation frame 105, windings 103 and a plurality of pins 102. The insulation frame 105 is arranged at the end of the stator core 101 in the axial direction of the stator core 101. The plurality of pins 102 are arranged at intervals, and one end of at least some of the plurality of pins 102 is connected to the insulation frame 105. The windings 103 are wound around the tooth portions of the stator core 101, and the lead wires of the windings 103 are connected to at least some of the plurality of pins 102. The stator injection body 200 covers one end of the plurality of pins 102, the windings 103, the insulation frame and the stator core 101, and the other end of the plurality of pins 102 penetrates through the stator injection body 200 and the casing injection body 300.

[0060] According to the motor of the embodiments of the present application, the stator core 101, the insulation frame 105, the windings 103 and the plurality of pins 102 are covered by the stator injection body 200, which can enhance the connection strength between the pins 102 and the insulation frame 105, thereby enhancing the stability of the connection between the windings 103 and the pins 102, and can protect the stator assembly 100 inside the secondary injection body, preventing the pins 102 from being deformed or skewed due to impact during the formation of the casing injection body 300 in the secondary injection process.

[0061] In some embodiments, the outer circumferential surface of the stator core 101 is provided with a second groove (not shown), and one end of one of the plurality of pins 102 is fitted in the second groove.

[0062] According to the motor of the embodiments of the present application, the second groove is fitted with the pin 102, so that the pin 102 is connected to ground through the second groove, and the pin 102 connected to ground is supported through the second groove and the stator injection body 200, thereby enhancing the stability of the pin 102 and preventing the pin 102 from being deformed.

[0063] In some embodiments, the stator assembly 100 further comprises a fixing plate 104, which is arranged on the insulation frame 105. One part of the fixing plate 104 is located in the stator injection body 200, and the other part of the fixing plate 104 is located in the casing injection body 300. The other end of the plurality of pins 102 penetrates through the stator injection body 200, the fixing plate 104 and the casing injection body 300 in sequence.

[0064] According to the motor of the embodiments of the present application, the fixing plate 104, the second groove and the stator injection body are cooperated, which can further protect the pins 102 from being deformed.

[0065] In some embodiments, the material of the stator injection body 200 is a thermosetting material, the material of the insulation frame 105 and the material of the fixing plate 104 are thermoplastics, the curing temperature of the thermosetting material is lower than the softening temperature of the thermoplastic material, and the thermal decomposition temperature of the thermosetting material is greater than the injection temperature of the casing injection body 300.

[0066] According to the motor of the embodiment of the present application, the thermosetting material with a curing temperature lower than the softening temperature of the thermoplastic material is used, so that the components such as the winding 103 inside the stator injection body 200 will not be damaged during injection, thereby ensuring the performance reliability of the electronic water pump, and the thermal decomposition temperature of the thermosetting material is greater than the injection temperature of the casing injection body 300, so that the stator injection body 200 will not be damaged when the casing injection body 300 is injected.

[0067] In some embodiments, the shell strength and weather resistance of the electronic water pump are required to be high, and high-strength engineering plastics are often used in production, and the high-strength engineering plastics often have high molding temperature and high cost. By using the secondary injection molding method, the stator injection body 200 of the stator assembly 100 and the casing injection body 300 of the casing assembly can be formed by different plastics, the casing injection body 300 requires high strength and good weather resistance, and the thermoplastic engineering plastic with high cost can be used, and the stator injection body 200 requires low strength, and the thermosetting plastic with low cost can be used. This way not only ensures the strength of the casing injection body 300, but also saves material cost.

[0068] Some specific exemplary motors according to the present application will be described below with reference to the accompanying drawings. As shown in Figures 1-6 The electronic water pump according to the embodiment of the present application includes a stator assembly 100, a stator injection body 200, and a casing injection body 300, the stator injection body 200 is formed by primary injection to at least partially cover the stator assembly 100, and the casing injection body 300 is formed by secondary injection to cover the stator injection body 200.

[0069] As shown in Figure 2 The cross section of the stator injection body 200 is annular, the stator injection body 200 includes a plurality of positioning holes 202 and a first groove 201, the plurality of positioning holes 202 are arranged on the upper end of the stator injection body 200, the positioning holes 202 extend downward along the upper end of the stator injection body 200, the positioning holes 202 include a first section 2021 and a second section 2022 arranged in sequence along the extension direction of the positioning holes 202, the first section 2021 is a conical hole, and the second section 2022 is a circular hole, the upper end of the circular hole is in communication with the lower end of the conical hole, and the cross-sectional area of the second section 2022 of one of the plurality of positioning holes 202 is smaller than the cross-sectional area of the second section 2022 of the remaining positioning holes 202.

[0070] Multiple first grooves 201 are provided on the inner circumferential surface of the stator injection molded body 200 and along the axial direction of the stator injection molded body 200. Figure 2 Extending in the vertical direction.

[0071] like Figure 1 and Figure 3 As shown, the injection molded housing 300 includes a top wall 303, a bottom wall 304, an outer peripheral wall 305, an inner peripheral wall 306, multiple mating parts 302, and multiple protrusions 301.

[0072] The stator injection molded body 200 is located in the cavity formed by the top wall 303, bottom wall 304, outer peripheral wall 305 and inner peripheral wall 306. The mating part 302 is provided on the top wall 303 in the cavity. The mating part 302 protrudes downward from the top wall 303 in the cavity. The mating part 302 includes a first mating part 3021 and a second mating part 3022 arranged sequentially along its protrusion direction. The first mating part 3021 fits in the first section 2021 and the second mating part 3022 fits in the second section 2022. The outer peripheral contour of the cross-section of the first mating part 3021 and the outer peripheral contour of the cross-section of the second mating part 3022 are both circular.

[0073] Multiple protrusions 301 are provided on the outer peripheral surface of the inner peripheral wall 306 of the housing injection body 300 and extend along the axial direction of the housing injection body 300. The protrusions 301 cooperate with the first groove 201 to increase the thickness of the first groove 201 and enhance the connection strength between the stator injection body 200 and the housing injection body 300.

[0074] The stator assembly 100 includes: a stator core 101, an insulating frame 105, multiple pins 102, multiple windings 103, and a fixing plate 104. For example... Figure 1 As shown, the upper and lower surfaces of the stator core 101 are respectively provided with insulating frames 105. Multiple pins 102 are spaced apart, and the lower ends of the pins 102 are connected to the insulating frames 105. The winding 103 is wound around the teeth of the insulating frame 105 and connected to the lower ends of the pins 102 through lead wires. The fixing plate 104 is provided on the upper end of the insulating frame 105, and the multiple pins 102 pass through the fixing plate 104. The stator injection molded body 200 covers one end of the multiple pins 102, the winding 103, the insulating frame and the stator core 101. The other ends of the multiple pins 102 pass through the stator injection molded body 200 and the housing injection molded body 300.

[0075] like Figure 5 and Figure 6 As shown, the fixing plate 104 is an arc plate, and the fixing plate 104 includes a body 1041, a first boss 1042, a second boss 1043, a through hole 1045, and a protrusion 1044.

[0076] The body 1041 comprises a first end surface 1046 and a second end surface 1047 arranged oppositely in the length direction of the body 1041, and comprises a first side surface 1048 and a second side surface 1049 arranged oppositely in the width direction of the body 1041, the first side surface 1048 of the body 1041 is provided with a protruding portion 1044 adjacent to the first end surface 1046 of the body 1041, the second boss 1043 is arranged spaced apart from the first boss 1042, the first boss 1042 comprises first, second and third circular boss portions 10421, 10422 and 10423 arranged spaced apart, and a first connecting portion 10424 connecting the first and second circular boss portions, a second connecting portion 10425 connecting the second and third circular boss portions 10423, the outer contour of the second boss 1043 is circular, and the second boss 1043 is one, the second boss 1043 is connected with the body 1041 and the protruding portion 1044, the through hole 1045 comprises a first through hole, a second through hole, a third through hole and a fourth through hole, the first through hole penetrates through the first circular boss portion 10421 and the body 1041, the second through hole penetrates through the second circular boss portion 10422 and the body 1041, the third through hole penetrates through the third circular boss portion 10423 and the body 1041, and the fourth through hole penetrates through the second boss 1043 and the protruding portion 1044 and partially exceeds the outer edge of the stator core 101, a second groove is formed in the corresponding position of the fourth through hole along the up-down direction of the outer edge of the stator core 101, that is, the second boss 1043 is arranged at the connecting position of the protruding portion 1044 and the body 1041, at this time, the pin 102 is four, and the four pins 102 are respectively a U-phase pin, a V-phase pin, a W-phase pin and a ground pin, the lower end of the U-phase pin penetrates through the third through hole and is connected with the insulating frame 105, the lower end of the V-phase pin 102 penetrates through the second through hole and is connected with the insulating frame 105, the lower end of the W-phase pin 102 penetrates through the first through hole and is connected with the insulating frame 105, the lead-out wires of the winding 103 are respectively connected with the lower end of the U-phase pin, the lower end of the V-phase pin and the lower end of the W-phase pin, and the lower end of the ground pin penetrates through the fourth through hole and is grounded through the groove formed in the corresponding position of the fourth through hole of the outer edge of the stator core 101.

[0077] The material of the stator injection body 200 is a thermosetting material, the material of the insulating frame 105 and the material of the fixing plate 104 are thermoplastic plastics, the curing temperature of the thermosetting material is lower than the softening temperature of the thermoplastic material, and the thermal decomposition temperature of the thermosetting material is greater than the injection temperature of the casing injection body 300.

[0078] The electronic water pump according to the embodiment of the still another aspect of the present application comprises the motor of the above-mentioned embodiment.

[0079] The vehicle according to the embodiment of the still another aspect of the present application comprises the electronic water pump according to the embodiment of the present application, and the vehicle can be a new energy vehicle, a fuel vehicle or the like, and the new energy vehicle includes a pure electric vehicle, a range-extended electric vehicle, a hybrid electric vehicle, a fuel cell electric vehicle, a hydrogen engine vehicle or the like.

[0080] According to the vehicle of the embodiment of the application, the electronic water pump can avoid the deformation, bulging, uneven cooling and other defects caused by insufficient injection of the injection material in the injection molding process, and improve the bonding strength of the twice injection molded body.

[0081] Although the embodiments of the application have been shown and described above, it should be understood by those skilled in the art that the above embodiments are exemplary and cannot be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. An electric machine characterized in that, The application relates to a stator assembly, a stator injection body and a casing injection body. The stator assembly comprises: a stator core; an insulation frame arranged on an end of the stator core in the axial direction of the stator core; a plurality of pins, at least part of the pins being connected to the insulation frame at one end; a winding wound on the tooth portion of the stator core, and the lead wire of the winding being connected to the at least part of the pins, 2. The electric machine of claim 1, wherein, the stator injection body covering the one end of the plurality of pins, the winding, the insulation frame and the stator core, and the other end of the plurality of pins penetrating through the stator injection body and the casing injection body.

3. The electric machine of claim 1, wherein, The outer circumferential surface of the stator core is provided with a second groove, and one end of one pin in the plurality of pins is fitted into the second groove.

4. The electric machine of claim 1, wherein, ​ 5. The electric machine of claim 4, wherein, ​ 6. The electric machine of claim 4, wherein, ​ 7. The electric machine of any of claims 1-6, wherein, ​ ​ ​ ​ ​ ​ 8. The electric machine of claim 7, wherein, ​ 9. The electric machine of claim 7, wherein, The fixing plate is arranged on the insulating frame, one part of the fixing plate is located in the stator injection body, another part of the fixing plate is located in the casing injection body, and the other ends of the plurality of pins pass through the stator injection body, the fixing plate and the casing injection body in sequence.

10. The electric machine of claim 9, wherein, The material of the stator injection body is a thermosetting material, the material of the insulating frame and the material of the fixing plate are thermoplastic materials, the curing temperature of the thermosetting material is lower than the softening temperature of the thermoplastic material, and the thermal decomposition temperature of the thermosetting material is greater than the injection temperature of the casing injection body.

11. An electronic water pump characterized by comprising: The motor comprises the motor as claimed in any one of claims 1-10.

12. A vehicle characterized by comprising: The electronic water pump comprises the electronic water pump as claimed in claim 11.

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