Electric drive system

Abstract

The utility model provides a kind of electric drive system, including casing and rotary variable total assembly, wherein, casing has the first cavity and the second cavity of intercommunication, first cavity and the second cavity are along axial arrangement, and first cavity is at least used to accommodate motor assembly, and the second cavity is at least used to accommodate electric control assembly;Rotary variable total assembly is arranged at the intercommunication passage of first cavity and the second cavity, and is sealed with casing Connection, to make first cavity and the second cavity are sealed cavity;Wherein, rotary variable total assembly includes rotating part and non-rotating part, at least non-rotating part is integrally formed.The utility model solves the problem that the rotary variable total assembly of electric drive system in prior art cannot effectively isolate motor cavity and electric control cavity, and the installation process of rotary variable total assembly is relatively complex.

Description

Technical Field

[0001] This utility model relates to the field of electric drive system technology, and more specifically, to an electric drive system. Background Technology

[0002] Currently, the integration and installation complexity of resolver assemblies pose a significant challenge in electric drive systems, particularly oil-cooled or water-cooled motor systems. Existing resolver assemblies lack self-sealing capabilities. When applied to electric drive systems requiring oil or water cooling, additional seals are needed to ensure the motor housing is sealed, further increasing installation complexity and cost. Furthermore, stator mounting relies on resolver stator clamping plates for fixation, leading to additional assembly steps. The use of clamping plates also reduces vibration resistance to some extent, a significant drawback for electric drive systems that prioritize high reliability.

[0003] Especially in all-in-one integrated electric drive systems, the coaxial arrangement of the motor unit and the electronic control unit has become a common layout scheme. The isolation requirements of the motor cavity and the electronic control cavity make it difficult for the existing resolver assembly to meet the requirements, because the existing resolver assembly cannot effectively isolate the two cavities and ensure the sealing reliability of the two cavities, which leads to a decrease in cooling effect and even causes the problem of mixing of cooling media, increasing the failure rate of the electric drive system. Utility Model Content

[0004] The main objective of this invention is to provide an electric drive system that solves the problems of the resolver assembly in existing electric drive systems being unable to effectively isolate the motor cavity and the electronic control cavity, and the installation process of the resolver assembly being relatively complex.

[0005] To achieve the above objectives, this utility model provides an electric drive system, including a housing and a resolver assembly. The housing has a first cavity and a second cavity that are connected to each other. The first cavity and the second cavity are arranged axially, and the first cavity is used to accommodate at least a motor assembly, and the second cavity is used to accommodate at least an electronic control assembly. The resolver assembly is disposed at the communication channel between the first cavity and the second cavity and is sealed to the housing, so that both the first cavity and the second cavity are sealed cavities. The resolver assembly includes a rotating part and a non-rotating part, and at least the non-rotating part is integrally formed.

[0006] In one exemplary embodiment, the non-rotating part is sealed to the housing.

[0007] In one exemplary embodiment, the non-rotating part is detachably connected to the housing.

[0008] In an exemplary embodiment, the housing includes a first cylindrical body and a second cylindrical body, with the bottom surface of the first cylindrical body connected to the bottom surface of the second cylindrical body to allow the first and second cylindrical bodies to be connected back-to-back. The first cylindrical body has a first cavity, and the second cylindrical body has a second cavity. The housing also includes a clearance through-hole that passes through the bottom surfaces of the first and second cylindrical bodies. The housing further includes an annular sealing platform that protrudes from the outer periphery of the clearance through-hole and extends axially into the second cavity. The inner ring side region of the annular sealing platform communicates with the clearance through-hole to form a communication channel. The non-rotating part is sealed to the annular sealing platform; and / or the non-rotating part is detachably connected to the annular sealing platform.

[0009] In an exemplary embodiment, the non-rotating part includes an injection-molded housing and a resolver stator, wherein the injection-molded housing is detachably connected to an annular sealing platform; and / or, the injection-molded housing is sealed to the annular sealing platform; the resolver stator is integrated on the injection-molded housing and integrally formed with the injection-molded housing, and the resolver stator is sealed to the annular sealing platform.

[0010] In an exemplary embodiment, the inner ring side of the annular sealing platform has a first sealing step. In the direction from the second cavity to the first cavity, the first sealing step sequentially includes a first sealing ring surface, a second sealing ring surface, and a first assembly ring surface. The first sealing ring surface extends axially along the annular sealing platform, the second sealing ring surface extends radially inward along the annular sealing platform, and the first assembly ring surface extends axially along the annular sealing platform. The outer peripheral side of the resolver stator has a second sealing step. In the direction from the second cavity to the first cavity, the second sealing step sequentially includes a third sealing ring surface, a fourth sealing ring surface, and a second assembly ring surface. The third sealing ring surface extends axially along the resolver stator, the fourth sealing ring surface extends radially inward along the resolver stator, and the second assembly ring surface extends axially along the resolver stator. The first sealing step and the second sealing step are interlocked to achieve radial sealing between the resolver stator and the annular sealing platform, and to achieve axial sealing between the resolver stator and the annular sealing platform, through the interlocking of the first and third sealing ring surfaces.

[0011] In an exemplary embodiment, the outer diameter of the injection-molded housing is larger than the outer diameter of the resolver stator, so that the annular end face of the injection-molded housing is located on the outer periphery of the resolver stator; wherein, the axial end face of the annular sealing platform facing the second cavity has an annular sealing groove, and an annular sealing ring is provided in the annular sealing groove; when the non-rotating part is assembled with the annular sealing platform, the resolver stator extends into the inner ring side region of the annular sealing platform, and the annular end face abuts against the axial end face of the annular sealing platform facing the second cavity and presses the annular sealing ring, so as to achieve axial, radial and circumferential sealing of the injection-molded housing and the annular sealing platform.

[0012] In an exemplary embodiment, the non-rotating part has a mounting groove with the opening of the mounting groove facing the first cavity side and extending axially along the non-rotating part and concentrically arranged with the communicating channel; at least a portion of the drive shaft of the motor assembly extends into the mounting groove; the rotating part includes a resolver rotor, which is rotatably sleeved on the outer periphery of the drive shaft located in the mounting groove, and a resolver stator is located on the outer periphery of the resolver rotor.

[0013] In an exemplary embodiment, the outer peripheral surface of the injection-molded housing is provided with a plurality of first mounting lugs, each of which has a first mounting hole; the outer peripheral surface of the annular sealing platform is provided with a plurality of second mounting lugs, each of which corresponds to one of the plurality of first mounting lugs, and each of the second mounting lugs has a second mounting hole; the electric drive system also includes a plurality of fasteners, each of which passes through the first mounting hole and is screwed into the second mounting hole in sequence.

[0014] In one exemplary embodiment, the non-rotating part further includes a transmission line, the first end of which is integrated into the injection-molded housing and integrally formed with the injection-molded housing, and a guide post protruding at the position where the second end of the transmission line passes through the injection-molded housing. The guide post has a guide hole, through which the transmission line passes and is electrically connected to the electronic control board of the electronic control component; or, a connector, which is integrated into the injection-molded housing and integrally formed with the injection-molded housing, and the connector is electrically connected to the electronic control board of the electronic control component through a wire.

[0015] The present invention provides an electric drive system comprising a housing and a resolver assembly. The housing has a first cavity and a second cavity that are connected to each other. The first cavity and the second cavity are arranged axially, and the first cavity is used to house at least a motor assembly, and the second cavity is used to house at least an electronic control assembly. The resolver assembly is disposed at the communication channel between the first cavity and the second cavity and is sealed to the housing, so that both the first cavity and the second cavity are sealed cavities. The resolver assembly includes a rotating part and a non-rotating part, and at least the non-rotating part is integrally formed.

[0016] By placing the resolver assembly at the communication channel between the first and second cavities and sealing it with the housing, both the first and second cavities become sealed cavities, achieving reliable isolation between them and thus meeting their sealing requirements. Furthermore, by configuring the resolver assembly into a structure including rotating and non-rotating parts, with at least the non-rotating parts integrally formed, the resolver assembly becomes modular, significantly reducing the assembly process and thus simplifying installation. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A cross-sectional structural schematic diagram of an electric drive system according to an alternative embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 The exploded structure diagram of the electric drive system in the figure is shown, in which the second cylinder is omitted;

[0020] Figure 3 It shows Figure 2 A schematic diagram of the exploded structure of the electric drive system from another perspective;

[0021] Figure 4 It shows Figure 2 A schematic diagram of the non-rotating part of the resolver assembly in the electric drive system.

[0022] The above figures include the following reference numerals:

[0023] 10. Housing; 11. First cavity; 12. Second cavity; 13. First cylinder; 14. Second cylinder; 15. Clearance hole; 16. Annular sealing platform; 161. First sealing step; 162. Annular sealing groove; 163. Annular sealing ring; 164. Second mounting lug; 1641. Second mounting hole;

[0024] 20. Resolver assembly; 21. Rotating part; 211. Resolver rotor; 22. Non-rotating part; 221. Injection-molded housing; 2211. First mounting lug; 2212. First mounting hole; 2213. Guide post; 222. Resolver stator; 2221. Second sealing step; 223. Mounting groove; 224. Transmission line;

[0025] 30. Drive shaft; 40. Fastener. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] To address the problems of existing electric drive systems where resolver assemblies cannot effectively isolate the motor housing and the electronic control housing, and where the installation process of resolver assemblies is relatively complex, this utility model provides an electric drive system.

[0028] like Figures 1 to 4 As shown, the electric drive system includes a housing 10 and a resolver assembly 20. The housing 10 has a first cavity 11 and a second cavity 12 that are connected to each other. The first cavity 11 and the second cavity 12 are arranged axially, and the first cavity 11 is used to accommodate at least a motor assembly, and the second cavity 12 is used to accommodate at least an electronic control assembly. The resolver assembly 20 is disposed at the communication channel between the first cavity 11 and the second cavity 12 and is sealed to the housing 10 so that both the first cavity 11 and the second cavity 12 are sealed cavities. The resolver assembly 20 includes a rotating part 21 and a non-rotating part 22, and at least the non-rotating part 22 is integrally formed.

[0029] By placing the resolver assembly 20 at the communication channel between the first cavity 11 and the second cavity 12 and sealing it with the housing 10, both the first cavity 11 and the second cavity 12 are sealed cavities, achieving reliable isolation between the first cavity 11 and the second cavity 12, thereby meeting the sealing requirements of the first cavity 11 and the second cavity 12. In addition, by setting the resolver assembly 20 into a structure including a rotating part 21 and a non-rotating part 22, and at least the non-rotating part 22 being integrally formed, the resolver assembly 20 is modularized, greatly reducing the assembly process of the resolver assembly 20, thereby reducing the complexity and difficulty of installing the resolver assembly 20.

[0030] It should be noted that in this application, the non-rotating part 22 is sealed to the housing 10. This ensures the reliability of the seal between the non-rotating part 22 and the housing 10, thereby isolating the first cavity 11 and the second cavity 12 and ensuring that there is no communication between the first cavity 11 and the second cavity 12.

[0031] It should be noted that in this application, the non-rotating part 22 is detachably connected to the housing 10. This ensures ease of installation and removal between the non-rotating part 22 and the housing 10.

[0032] like Figure 1As shown, the housing 10 includes a first cylindrical body 13 and a second cylindrical body 14. The bottom surface of the first cylindrical body 13 is connected to the bottom surface of the second cylindrical body 14, so that the first cylindrical body 13 and the second cylindrical body 14 are connected back to back. The first cylindrical body 13 has a first cavity 11, and the second cylindrical body 14 has a second cavity 12. The housing 10 also has a clearance through hole 15, which passes through the bottom surface of the first cylindrical body 13 and the bottom surface of the second cylindrical body 14. The housing 10 also includes an annular sealing platform 16, which protrudes from the outer periphery of the clearance through hole 15 and extends along the axial direction of the housing 10 into the second cavity 12. The inner ring side region of the annular sealing platform 16 communicates with the clearance through hole 15 and forms a communication channel. The non-rotating part 22 is sealed to the annular sealing platform 16; and / or, the non-rotating part 22 is detachably connected to the annular sealing platform 16. In this way, the arrangement of the annular sealing platform 16 ensures that the non-rotating part 22 and the annular sealing platform 16 can achieve an effective sealing connection, thereby isolating the first cavity 11 and the second cavity 12 and ensuring that there is no communication between the first cavity 11 and the second cavity 12.

[0033] like Figures 1 to 3 As shown, the non-rotating part 22 includes an injection-molded housing 221 and a resolver stator 222, wherein the injection-molded housing 221 is detachably connected to the annular sealing platform 16; and / or, the injection-molded housing 221 is sealed to the annular sealing platform 16; the resolver stator 222 is integrated onto the injection-molded housing 221 and integrally formed with the injection-molded housing 221, and the resolver stator 222 is sealed to the annular sealing platform 16. Thus, by integrating the resolver stator 222 onto the injection-molded housing 221 and integrally molding it, the assembly complexity of the resolver assembly 20 is reduced, thereby improving the assembly efficiency of the resolver assembly 20.

[0034] Furthermore, the resolver stator 222 and the injection-molded housing 221 are integrally injection molded. The principle of this design is to use injection molding to tightly integrate the resolver stator 222 and the injection-molded housing 221 into a single unit. This not only enhances structural stability but also simplifies the production process and reduces manufacturing costs. The implementation results in improved structural strength and seismic performance of the resolver assembly, reduced material requirements for installation, simplified installation steps for the electric drive system, and improved production efficiency and product quality. The main application scenarios are in electric drive systems requiring high integration and reliability, especially in the electric drive systems of new energy vehicles, where it effectively improves the integration and reliability of the electric drive system, reduces maintenance costs, and enhances the overall performance of the vehicle. In practice, when axially arranging the motor and electronic control system, the integrated resolver assembly is aligned with the motor housing and secured with M4 bolts, eliminating the need for an additional stator clamping plate, simplifying the installation steps and improving installation efficiency.

[0035] like Figures 1 to 3As shown, the inner ring side of the annular sealing platform 16 has a first sealing step 161. In the direction from the second cavity 12 to the first cavity 11, the first sealing step 161 sequentially includes a first sealing ring surface, a second sealing ring surface, and a first assembly ring surface; wherein, the first sealing ring surface extends axially along the annular sealing platform 16, the second sealing ring surface extends radially inward along the annular sealing platform 16, and the first assembly ring surface extends axially along the annular sealing platform 16; the outer peripheral side of the resolver stator 222 has a second sealing step 2221. In the direction from the second cavity 12 to the first cavity 11, the second sealing step 2221 sequentially includes... The system includes a third sealing ring surface, a fourth sealing ring surface, and a second assembly ring surface. The third sealing ring surface extends axially along the resolver stator 222, the fourth sealing ring surface extends radially inward along the resolver stator 222, and the second assembly ring surface extends axially along the resolver stator 222. The first sealing step 161 and the second sealing step 2221 are interlocked to achieve radial sealing between the resolver stator 222 and the annular sealing platform 16, and to achieve axial sealing between the resolver stator 222 and the annular sealing platform 16, through the engagement of the first sealing ring surface and the third sealing ring surface. In this way, the insertion and engagement of the first sealing step 161 and the second sealing step 2221 enables the first sealing ring surface and the third sealing ring surface to achieve radial sealing of the resolver stator 222 and the annular sealing platform 16, and enables the second sealing ring surface and the fourth sealing ring surface to achieve axial sealing of the resolver stator 222 and the annular sealing platform 16, thereby ensuring that the resolver assembly 20 can effectively isolate the first cavity 11 and the second cavity 12.

[0036] like Figures 1 to 3 As shown, the outer diameter of the injection molded housing 221 is larger than the outer diameter of the resolver stator 222, so that the annular end face of the injection molded housing 221 is located on the outer periphery of the resolver stator 222; wherein, the axial end face of the annular sealing platform 16 facing the second cavity 12 has an annular sealing groove 162, and an annular sealing ring 163 is provided in the annular sealing groove 162; when the non-rotating part 22 is assembled with the annular sealing platform 16, the resolver stator 222 extends into the inner ring side region of the annular sealing platform 16, and the annular end face abuts against the axial end face of the annular sealing platform 16 facing the second cavity 12 and presses the annular sealing ring 163, so as to achieve axial, radial and circumferential sealing of the injection molded housing 221 and the annular sealing platform 16. In this way, the setting of the annular sealing ring 163, combined with the insertion and cooperation of the first sealing step 161 and the second sealing step 2221, achieves a dual isolation effect on the first cavity 11 and the second cavity 12, further improving the sealing reliability between the first cavity 11 and the second cavity 12.

[0037] like Figures 1 to 3As shown, the non-rotating part 22 has a mounting groove 223, the opening of which faces the first cavity 11, and the mounting groove 223 extends axially along the non-rotating part 22 and is concentrically arranged with the communicating channel; at least a portion of the drive shaft 30 of the motor assembly extends into the mounting groove 223; the rotating part 21 includes a resolver rotor 211, which is rotatably fitted onto the outer periphery of the drive shaft 30 located within the mounting groove 223, and the resolver stator 222 is located on the outer periphery of the resolver rotor 211. Thus, the mounting groove 223 provides installation space for the resolver rotor 211 and fully utilizes the overall axial space of the housing 10, preventing the overall axial dimension of the electric drive system from becoming too large, which is beneficial for the compact and miniaturized design of the electric drive system.

[0038] like Figures 2 to 4 As shown, the outer peripheral surface of the injection-molded housing 221 is provided with a plurality of first mounting lugs 2211, each of which has a first mounting hole 2212. The outer peripheral surface of the annular sealing platform 16 is provided with a plurality of second mounting lugs 164, each of which corresponds to one of the first mounting lugs 2211, and each of which has a second mounting hole 1641. The electric drive system also includes a plurality of fasteners 40, each of which passes through the first mounting hole 2212 and is screwed into the second mounting hole 1641. In this way, by tightening the plurality of fasteners 40, the reliability and stability of the connection between the resolver assembly 20 and the housing 10 are achieved, and the ease of assembly between the resolver assembly 20 and the housing 10 is also ensured.

[0039] like Figures 1 to 4 As shown, the non-rotating part 22 also includes a transmission line 224. The first end of the transmission line 224 is integrated into the injection-molded housing 221 and integrally formed with the injection-molded housing 221. A guide post 2213 protrudes from the second end of the transmission line 224 where it exits the injection-molded housing 221. The guide post 2213 has a guide hole through which the transmission line 224 exits and is electrically connected to the electronic control board of the electronic control assembly. In this way, by integrating the first end of the transmission line 224 into the injection-molded housing 221, the assembly complexity of the resolver assembly 20 is reduced.

[0040] It should be noted that in this application, the transmission line 224 is a long pin flexible wire. By integrating the long pin flexible wire into the injection-molded housing 221, the stability and reliability of signal transmission can be achieved. The pin flexible wire injection molding and connector integration injection molding scheme provides flexibility, allowing selection of the most suitable solution based on different application scenarios. The implementation effect is improved signal transmission quality, reduced problems caused by poor signal line connections, and the provision of diverse options to meet the needs of different customers. The main application scenario is in electric drive systems requiring signal transmission, especially in the electric drive systems of new energy vehicles, where it effectively improves the stability and reliability of signal transmission, reduces the failure rate, and improves the overall performance of the electric drive system. The usage process involves aligning the resolver assembly 20 with the housing 10 when the motor and electronic control are axially arranged, fixing it with M4 bolts, and connecting the long pin flexible wire to the external circuit to achieve the signal transmission function.

[0041] Furthermore, by utilizing injection molding, the long PIN needle wire is integrated with the injection-molded housing 221 and the resolver stator 222 into a continuous whole. This not only improves the stability of signal transmission but also enhances the structure's sealing and shock resistance. The implementation effect is improved overall performance of the resolver assembly 20, reduced problems caused by poor signal line connections or inadequate sealing, and enhanced protection level and service life of the electric drive system. The main application scenarios are in electric drive systems requiring signal transmission and high sealing, especially in the electric drive systems of new energy vehicles. It effectively improves the stability and reliability of signal transmission while ensuring airtight isolation between the motor cavity and the electronic control cavity, thus improving the overall performance and safety of the electric drive system. The usage process involves aligning the integrated resolver assembly 20 with the housing 10 during axial arrangement of the motor and electronic control system, fixing it with M4 bolts, and connecting the long PIN needle wire to the external circuitry to achieve signal transmission. Simultaneously, the O-ring seal deforms under the bolt tightening force, forming a seal and ensuring airtight isolation between the motor cavity and the electronic control cavity.

[0042] The electric drive system provided in this application uses an O-ring seal between the resolver assembly 20 and the housing 10 to form a seal under the tightening force of bolts, effectively isolating the oil-cooled motor cavity from the water-cooled electronic control cavity and preventing cross-contamination between oil-cooling and water-cooling media. The implementation effect is to improve the protection level and service life of the electric drive system, reduce the failure rate caused by media contamination, and improve the operational stability and safety of the vehicle. The main application scenario is in highly integrated electric drive systems of oil-cooled motors and water-cooled electronic controls, especially in the electric drive systems of new energy vehicles, where it can effectively seal the motor cavity and the electronic control cavity, preventing cross-contamination between oil-cooling and water-cooling media and improving the safety and reliability of the system. The usage process involves aligning the resolver assembly 20 with the housing 10 when the motor and electronic control are axially arranged, and fixing them with M4 bolts. During the tightening of the bolts, the O-ring seal is compressed, forming a seal and ensuring airtight isolation between the motor cavity and the electronic control cavity, preventing cross-contamination between oil-cooling and water-cooling media.

[0043] It should be noted that, in one embodiment of this application (not shown), the non-rotating part 22 further includes a connector, which is integrated into the injection-molded housing 221 and integrally formed with it. The connector is electrically connected to the electronic control board of the electronic control assembly via a wire. In this way, by integrating the connector into the injection-molded housing 221, the assembly complexity of the resolver assembly 20 is reduced.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0046] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0048] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric drive system, characterized in that, include: The housing (10) has a first cavity (11) and a second cavity (12) that are connected to each other. The first cavity (11) and the second cavity (12) are arranged axially, and the first cavity (11) is used to accommodate at least a motor assembly, and the second cavity (12) is used to accommodate at least an electronic control assembly. A resolver assembly (20) is disposed at the communication channel between the first cavity (11) and the second cavity (12) and is sealed to the housing (10) so that both the first cavity (11) and the second cavity (12) are sealed cavities. The resolver assembly (20) includes a rotating part (21) and a non-rotating part (22), at least the non-rotating part (22) is integrally formed.

2. The electric drive system according to claim 1, characterized in that, The non-rotating part (22) is sealed to the housing (10).

3. The electric drive system according to claim 1, characterized in that, The non-rotating part (22) is detachably connected to the housing (10).

4. The electric drive system according to claim 1, characterized in that, The housing (10) includes: A first cylinder (13) and a second cylinder (14), wherein the bottom surface of the first cylinder (13) is connected to the bottom surface of the second cylinder (14) so ​​that the first cylinder (13) and the second cylinder (14) are connected back to back, the first cylinder (13) has the first cavity (11) and the second cylinder (14) has the second cavity (12). The housing (10) also has a clearance through hole (15), which passes through the bottom surface of the first cylinder (13) and the bottom surface of the second cylinder (14); The housing (10) also includes: An annular sealing platform (16) is provided on the outer periphery of the clearance hole (15) and extends along the axial direction of the housing (10) into the second cavity (12). The inner ring side region of the annular sealing platform (16) communicates with the clearance hole (15) and forms the communication channel. Wherein, the non-rotating part (22) is sealed to the annular sealing platform (16); and / or, The non-rotating part (22) is detachably connected to the annular sealing platform (16).

5. The electric drive system according to claim 4, characterized in that, The non-rotating part (22) includes: Injection molded housing (221), wherein the injection molded housing (221) is detachably connected to the annular sealing platform (16); and / or, the injection molded housing (221) is sealed to the annular sealing platform (16); A resolver stator (222) is integrated on the injection-molded housing (221) and integrally formed with the injection-molded housing (221). The resolver stator (222) is sealed to the annular sealing platform (16).

6. The electric drive system according to claim 5, characterized in that, The inner ring side of the annular sealing platform (16) has a first sealing step (161). In the direction from the second cavity (12) to the first cavity (11), the first sealing step (161) sequentially includes a first sealing ring surface, a second sealing ring surface, and a first assembly ring surface. The first sealing ring surface extends axially along the annular sealing platform (16), the second sealing ring surface extends radially inward along the annular sealing platform (16), and the first assembly ring surface extends axially along the annular sealing platform (16). The outer periphery of the resolver stator (222) has a second sealing step (2221). In the direction from the second cavity (12) to the first cavity (11), the second sealing step (2221) sequentially includes a third sealing ring surface, a fourth sealing ring surface, and a second assembly ring surface. The third sealing ring surface extends along the axial direction of the resolver stator (222), the fourth sealing ring surface extends radially inward along the resolver stator (222), and the second assembly ring surface extends along the axial direction of the resolver stator (222). The first sealing step (161) and the second sealing step (2221) are inserted into each other so that the first sealing ring surface and the third sealing ring surface achieve radial sealing of the resolver stator (222) and the annular sealing platform (16), and the second sealing ring surface and the fourth sealing ring surface achieve axial sealing of the resolver stator (222) and the annular sealing platform (16).

7. The electric drive system according to claim 5, characterized in that, The outer diameter of the injection molded housing (221) is larger than the outer diameter of the resolver stator (222) so that the annular end face of the injection molded housing (221) is located on the outer periphery of the resolver stator (222); The annular sealing platform (16) has an annular sealing groove (162) on the axial end face facing the second cavity (12), and an annular sealing ring (163) is provided in the annular sealing groove (162). When the non-rotating part (22) is assembled with the annular sealing platform (16), the resolver stator (222) extends into the inner ring side region of the annular sealing platform (16), and the annular end face abuts against the axial end face of the annular sealing platform (16) facing the second cavity (12) and presses the annular sealing ring (163) to achieve axial, radial and circumferential sealing of the injection molded housing (221) and the annular sealing platform (16).

8. The electric drive system according to claim 5, characterized in that, The non-rotating part (22) has an assembly groove (223), the opening of the assembly groove (223) faces the first cavity (11), and the assembly groove (223) extends along the axial direction of the non-rotating part (22) and is concentrically arranged with the communicating channel; At least a portion of the drive shaft (30) of the motor assembly extends into the mounting groove (223); The rotating part (21) includes: A resolver rotor (211) is rotatably fitted on the outer periphery of the drive shaft (30) located in the mounting groove (223), and the resolver stator (222) is located on the outer periphery of the resolver rotor (211).

9. The electric drive system according to claim 5, characterized in that, The outer peripheral surface of the injection molded housing (221) is provided with a plurality of first mounting lugs (2211), and each of the first mounting lugs (2211) is provided with a first mounting hole (2212); The outer peripheral surface of the annular sealing platform (16) is provided with a plurality of second mounting lugs (164), and the plurality of second mounting lugs (164) correspond one-to-one with the plurality of first mounting lugs (2211). Each second mounting lug (164) is provided with a second mounting hole (1641). The electric drive system also includes a plurality of fasteners (40), each of which passes through the first mounting hole (2212) and is screwed into the second mounting hole (1641) in sequence.

10. The electric drive system according to claim 5, characterized in that, The non-rotating part (22) also includes: A transmission line (224) has its first end integrated into the injection-molded housing (221) and integrally formed with the injection-molded housing (221). A guide post (2213) protrudes from the second end of the transmission line (224) at the point where it exits the injection-molded housing (221). The guide post (2213) has a guide hole through which the transmission line (224) passes and is electrically connected to the electronic control board of the electronic control assembly; or... The connector is integrated on the injection-molded housing (221) and integrally formed with the injection-molded housing (221), and the connector is electrically connected to the electronic control board of the electronic control component through a wire.

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