Connecting assembly and bridge driving system

Abstract

The utility model provides a connecting assembly and a bridge driving system. The connecting assembly comprises a connecting bar, a controller housing, a motor housing and a sealing ring. The connecting row is arranged in the controller shell and the motor shell in a penetrating mode, and the sealing ring is arranged between the controller shell and the motor shell in a sleeving mode and used for preventing refrigerants from leaking from a gap between the motor shell and the controller shell; a pouring cavity is formed between the side wall of the connecting row and the inner wall of the controller shell, and a sealing material is poured into the pouring cavity and used for preventing refrigerants from leaking from a gap between the connecting row and the controller shell. Through the configuration, sealing can be achieved only through one sealing ring and one sealing material, the production cost is reduced, meanwhile, the sealing material is poured into the pouring cavity, the space utilization rate can be increased, the development trend of miniaturization and low cost can be achieved, and the structural rigidity can be further improved after the sealing material is cured.

Description

Technical Field

[0001] The utility model relates to the field of electric vehicles, in particular to a connection component and an electric bridge drive system. Background Art

[0002] With the development of the electric vehicle industry, the use of three-in-one drive axles has become a clear trend in electric drive assemblies. The entire industry has increasingly stringent requirements for electric drive assemblies. High speed, high output power, small size, light weight, high integration, and low cost have gradually become core requirements. At the same time, oil-cooled motors have become the main development direction of motors due to their high power density, high torque density, pin size, and compact structure. Therefore, the requirements for the interface design between the inverter and the drive motor are becoming more and more stringent.

[0003] The design of the inverter and motor interface mainly considers the medium-resistant sealing performance to ensure that the medium will not enter the inverter housing through the gap between the copper busbar and the plastic, between the plastic and the inverter housing, and the gap between the plastic housing itself.

[0004] Please refer to Figure 1 The current mainstream media-resistant sealing design is to use a double-layer end face sealing ring plus a media-resistant sealant: a media-resistant sealant (generally a softer silicone) is used to seal the leakage channel 1 between the copper busbar and the plastic; a layer of end face sealing ring is used to seal the leakage channel 2 between the copper busbar and the controller housing; another layer of end face sealing ring is used to seal the leakage channel 3 between the controller housing and the motor housing.

[0005] The disadvantages of this sealing method are:

[0006] 1. The space required is large, and the space of two layers of sealing rings can no longer meet the current miniaturization needs;

[0007] 2. The cost is relatively high, mainly reflected in the cost of additional machining of die castings, the cost of sealing rings and the process cost of sealants;

[0008] 3. The sealing design is relatively complex and has high requirements on size;

[0009] 4. The process is relatively complicated;

[0010] 5. The reliability of the output interface under high vibration levels is low;

[0011] 6. There are relatively many failure modes, which is not conducive to the reliability design of the assembly.

[0012] These shortcomings limit the current core design needs of miniaturization and low cost. Therefore, providing an integrated interface between the inverter and the motor that meets the current needs has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0013] The utility model aims to provide a connection component and an electric bridge driving system to solve the problem that the existing integrated interface does not meet the core design requirements of miniaturization and low cost.

[0014] In order to achieve the above-mentioned object, the utility model provides a connection assembly, including: a connection row, a controller housing, a motor housing and a sealing ring;

[0015] The connecting row is provided through the controller housing and the motor housing, wherein a receiving cavity is provided between the controller housing and the motor housing, and the sealing ring is provided in the receiving cavity to prevent the refrigerant from leaking from the gap between the motor housing and the controller housing;

[0016] A filling cavity is provided between the side wall of the connecting row and the inner wall of the controller housing. The filling cavity is filled with sealing material to prevent the refrigerant from leaking from the gap between the connecting row and the controller housing.

[0017] Optionally, the sealing ring includes a radial sealing ring, which seals the accommodating cavity along the radial direction of the connecting row to prevent the refrigerant from flowing in the axial direction of the connecting row.

[0018] Optionally, the sealing ring includes an axial sealing ring, which seals the accommodating cavity along the axial direction of the connecting row to prevent the refrigerant from flowing in the radial direction of the connecting row.

[0019] Optionally, a covering member is provided on the outside of the connecting bar, and the covering member cooperates with the sealing material to prevent the refrigerant from leaking from a gap between the connecting bar and the controller housing.

[0020] Optionally, the covering member at least covers a connecting portion between the connecting row and the controller housing.

[0021] Optionally, the covering member protrudes outwardly in the radial direction of the connection row to form a protrusion, and the protrusion abuts against the controller housing.

[0022] Optionally, the covering member is further provided with a sleeve portion, the sleeve portion and the protruding portion are arranged along the axial direction of the connecting row, the controller housing is provided with a through hole, and the minimum radial length of the through hole is adapted to the sum of the radial lengths of the connecting row and the sleeve portion.

[0023] Optionally, the connection assembly further includes a seal, which is sleeved on a connection portion between the connection row and the controller housing, and the seal cooperates with the sealing material to prevent the refrigerant from leaking from a gap between the connection row and the control housing.

[0024] Optionally, the controller housing has a narrowed section, and when the controller housing is connected to the motor housing, the narrowed section is located inside the motor housing, and the sealing ring is sleeved outside the narrowed section.

[0025] In order to achieve the above-mentioned object, the utility model also provides an electric bridge drive system, including: a drive motor, a motor controller and a transmission device;

[0026] The drive motor is disposed in the motor housing, the motor controller is disposed in the controller housing, and the drive motor drives the transmission device to output torque to an external structure;

[0027] The motor controller includes an inverter, which is connected to the drive motor via the connection assembly as described above, and is used to output electric energy to the drive motor.

[0028] Compared with the existing connection interface between the inverter and the motor, this application has the following advantages:

[0029] (1) The present application prevents the refrigerant from leaking from the gap between the controller housing and the motor housing by arranging the sealing member between the outer wall of the controller housing and the inner wall of the motor housing; at the same time, the sealing material is poured into the pouring cavity between the connecting row and the controller housing to prevent the refrigerant from leaking from the gap between the connecting row and the controller housing; compared with the solution in the prior art that requires two sealing rings and one sealing material to achieve sealing, the present application only requires one sealing ring and one sealing material to achieve sealing, thereby reducing production costs; at the same time, by pouring the sealing material into the pouring cavity, the space utilization rate can be improved, which is conducive to the development trend of miniaturization and low cost, and the structural rigidity can be further improved after the sealing material is cured;

[0030] (2) By providing a covering member on the outside of the connecting bar, the sealing effect of the sealing material can be further improved. At the same time, the covering member cooperates with the sealing material to prevent the refrigerant from leaking from the gap between the covering member and the connecting bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a connection interface between an inverter and a motor in the prior art;

[0032] Figure 2 This is a schematic diagram of the structure of the connection assembly provided in an embodiment of the utility model;

[0033] Figure 3 A partial cross-sectional view of a first connection assembly provided in an embodiment of the utility model;

[0034] Figure 4A partial cross-sectional view of a second connection assembly provided in an embodiment of the utility model;

[0035] Figure 5 A schematic diagram of the connection relationship between the sealing ring and the controller housing provided in an embodiment of the utility model;

[0036] The description of each reference numeral is as follows:

[0037] 10-connecting row; 11-controller housing; 12-motor housing; 13-sealing ring; 14-accommodating chamber; 15-injection chamber; 16-sealing material; 17-covering piece; 18-copper row; 19-first sealing ring; 20-second sealing ring; 21-sealing glue; 22-plastic; 111-narrowing section; 171-protruding part; 172-sleeving part;

[0038] X- axial direction of the connecting row; Y- radial direction of the connecting row. DETAILED DESCRIPTION

[0039] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0040] As used in this specification, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used to include the meaning of "and / or", the term "several" is generally used to include the meaning of "at least one", and the term "at least two" is generally used to include the meaning of "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" and "the proximal end" and "the distal end" generally refer to two corresponding parts, which include not only the endpoints, and the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. In addition, as used in this specification, an element disposed on another element generally only indicates that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the connection, coupling, cooperation or transmission between the two elements may be direct or indirect through an intermediate element, and it cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element may be in any orientation such as inside, outside, above, below or on one side of another element, unless the content clearly indicates otherwise. The terms "upper", "lower", "top" and "bottom" are generally relative position relationships arranged in the direction of gravity; the terms "vertical, vertical direction" generally refer to the direction of gravity, which is generally perpendicular to the ground, and "horizontal, horizontal plane direction" generally refers to the direction parallel to the ground; for ordinary technicians in this field, the specific meanings of the above terms in this specification can be understood according to specific circumstances.

[0041] The utility model aims to provide a connection component and an electric bridge driving system to solve the problem that the existing integrated interface does not meet the core design requirements of miniaturization and low cost.

[0042] The following description is given with reference to the accompanying drawings.

[0043] Please refer to Figure 1As can be understood by those skilled in the art, the connection interface between the existing inverter and the motor is provided with a copper bar 18, a first sealing ring 19, a second sealing ring 20 and a sealant 21; wherein the copper bar 18 is inserted into the controller housing 11 and the motor housing 12, the first sealing ring 19 is provided between the copper bar 18 and the controller housing 11, the second sealing ring 20 is provided between the controller housing 11 and the motor housing 12, and a glue pouring groove is provided in a part of the copper bar 18 to accommodate the sealant 21. The above sealing scheme prevents the cooling oil from leaking from the self-leakage path 1 (i.e., the gap between the copper bar 18 and the plastic 22) through the sealant 21, the first seal can prevent the cooling oil from leaking from the self-leakage path 2 (i.e., the gap between the copper bar 18 and the controller housing 11), and the second seal can prevent the cooling oil from leaking from the self-leakage path 3 (i.e., the gap between the controller housing 11 and the motor housing 12). Although this solution can effectively avoid cooling oil leakage, it requires a large space, has a relatively high cost, and has a relatively complex design and process. The reliability of the output interface under high vibration levels is low, and it cannot effectively meet the production trend of miniaturization and low cost. Based on this, the present application provides a connection assembly that improves space utilization and reduces the cost of sealing components by simplifying the component configuration of the sealing scheme, thereby meeting the development trend of miniaturization and low cost. It should be noted that this embodiment only uses the motor housing 12 and the controller housing 11 as an example to illustrate the connection assembly, which does not mean that the connection assembly provided in this embodiment can only be used in the connection between the motor housing 12 and the controller housing 11. As long as there is an application scenario with sealing requirements, the connection assembly mentioned in the embodiment can be used. Those skilled in the art can configure the application scenario of the connection assembly according to actual conditions, and this embodiment does not limit this.

[0044] Please refer to Figures 2 to 5The utility model provides a connection assembly, including: a connection bar 10, a controller housing 11, a motor housing 12 and a sealing ring 13; the connection bar 10 is arranged through the controller housing 11 and the motor housing 12, wherein a receiving chamber 14 is provided between the controller housing 11 and the motor housing 12, and the sealing ring 13 is provided in the receiving chamber 14, which is used to prevent the refrigerant from leaking from the gap between the motor housing 12 and the controller housing 11; a perfusion chamber 15 is provided between the side wall of the connection bar 10 and the inner wall of the controller housing 11, and a sealing material 16 is perfused in the perfusion chamber 15, which is used to prevent the refrigerant from leaking from the gap between the connection bar 10 and the controller housing 11. It should be noted that in this embodiment, the sealing material 16 can be a sealant and / or a potting glue, wherein the sealant can be silica gel and the potting glue can be epoxy resin; the connection bar 10 can be a copper bar or a component of other materials; the refrigerant can be cooling oil, or other gas or liquid circulating in the component. It can be understood by those skilled in the art that, in the process of assembling the connection component, the connection row 10 is first inserted into the controller housing 11, and the sealing material 16 is poured into the pouring cavity 15; then the sealing ring 13 is sleeved on the outside of the controller housing 11; finally, the controller housing 11 sleeved with the sealing ring 13 is connected to the motor housing 12, so that the connection between the controller and the motor can be achieved.

[0045] With such configuration, the present application can prevent the refrigerant from leaking from the gap between the controller housing 11 and the motor housing 12 by arranging the sealing member between the outer wall of the controller housing 11 and the inner wall of the motor housing 12; at the same time, the sealing material 16 is poured into the filling cavity 15 between the connecting row 10 and the controller housing 11, so as to prevent the refrigerant from leaking from the gap between the connecting row 10 and the controller housing 11; compared with the solution in the prior art that requires two sealing rings 13 and one sealing material 16 to achieve sealing, the present application only needs one sealing ring 13 and one sealing material 16 to achieve sealing, thereby reducing production costs; at the same time, by pouring the sealing material 16 into the filling cavity 15, the space utilization rate can be improved, which is conducive to the development trend of miniaturization and low cost, and the structural rigidity can be further improved after the sealing material 16 is cured.

[0046] As an optional embodiment, please refer to Figure 3 The sealing ring 13 includes a radial sealing ring, which seals the accommodating cavity 14 along the radial direction Y of the connecting row to prevent the refrigerant from flowing in the axial direction X of the connecting row. Figure 3In the illustrated example, the sealing ring 13 is a radial sealing ring. During use, the radial sealing ring is pressed by the extrusion force of the motor housing 12 along the radial direction Y of the connecting row, and can block the flow of the refrigerant along the axial direction X of the connecting row. It should be noted that the axial sealing ring used in the prior art requires the rigidity of the components participating in the formation of the sealing surface or the sealing groove, and generally requires the use of a group of screws to provide the tightening force; while the radial sealing ring used in the present application can complete the sealing only by the extrusion force of the motor housing 12 along the radial direction Y of the connecting row, without the need for additional screws, reducing the installation space required during the installation process, and further meeting the development needs of miniaturization and low cost.

[0047] As another optional embodiment, please refer to Figure 4 , the sealing ring 13 includes an axial sealing ring, which seals the accommodating cavity 14 along the axial direction X of the connecting row to prevent the circulation of the refrigerant in the radial direction Y of the connecting row. It should be noted that during use, the axial sealing ring is subjected to the extrusion force of the controller housing 11 and the motor housing 12 along the axial direction X of the connecting row, and can prevent the circulation of the refrigerant in the radial direction Y of the connecting row. It should be noted that due to the physical properties and functional requirements of the axial sealing ring, it puts forward requirements on the stiffness of the components participating in the formation of the sealing surface or the sealing groove. Generally speaking, it is necessary to use a group of screws to tighten the above components to provide a sealing force that meets the requirements; the prior art provides a sealing solution for setting two axial sealing rings. In addition to setting a set of screws when the controller housing 11 and the motor housing 12 are installed, an additional set of screws is required to provide a tightening force to the axial sealing ring. The sealing solution in this application only needs to set a set of screws when the controller housing 11 and the motor housing 12 are installed to meet the tightening requirements of the axial sealing ring, reducing the axial space required during the installation process, and further meeting the development trend of miniaturization and low cost.

[0048] In an alternative example, please refer to Figure 3 The outer part of the connecting bar 10 is provided with a covering 17, which cooperates with the sealing material 16 to prevent the refrigerant from leaking from the gap between the connecting bar 10 and the controller housing 11. It should be noted that in this embodiment, the covering 17 is a plastic layer, which is formed on the outer part of the connecting bar 10 by a plastic coating process. Of course, in other embodiments, the covering 17 can also be composed of other materials with isolation oil, and those skilled in the art can configure it according to actual conditions.

[0049] Furthermore, the covering member 17 at least covers the connection portion between the connection row 10 and the controller housing 11. Furthermore, the covering member 17 protrudes outward along the radial direction Y of the connection row to form a protrusion 171, and the protrusion 171 abuts against the controller housing 11; the covering member 17 is also provided with a sleeve portion 172, and the sleeve portion 172 and the protrusion 171 are arranged along the axial direction X of the connection row, and the controller housing 11 is provided with a through hole, and the minimum radial length of the through hole is adapted to the sum of the radial lengths of the connection row 10 and the sleeve portion 172. It should be noted that the protrusion 171 and the sleeve portion 172 are integrally formed, wherein the protrusion 171 can be formed by injection molding or compression molding, and the sleeve portion 172 is a layered component that is coated on the outside of the connection row 10 along the circumference thereof. In this configuration, by arranging the covering member 17 on the outside of the connection bar 10, the sealing effect of the sealing material 16 can be further improved. At the same time, the covering member 17 cooperates with the sealing material 16, and even if there is a gap between the covering member 17 and the connection bar 10 during the overmolding process, the refrigerant can be prevented from leaking from the gap between the covering member 17 and the connection bar 10. In order to reduce production costs, the covering member 17 can be only arranged at the connection part between the connection bar 10 and the controller housing 11; at the same time, the covering member 17 may not be provided with the protrusion 171, but only with the sleeve portion 172, and the main function of the protrusion 171 is to form an anchoring connection with the cured sealing material 16 to improve the strength of the overall component. Therefore, the protrusion 171 may not be against the controller housing 11, and those skilled in the art can reasonably configure the covering member 17 according to actual conditions.

[0050] In an optional embodiment, the connection assembly further includes a seal (not shown in the figure), which is sleeved on the connection portion between the connection row 10 and the controller housing 11, and cooperates with the sealing material 16 to prevent the refrigerant from leaking from the gap between the connection row 10 and the control housing. It should be noted that the seal can be a sealing ring 13 or other component with a sealing function, which can replace the role of the covering 17, and improve the strength of the overall component through the anchoring effect between the seal and the sealing material 16. At the same time, the setting of the seal can also avoid the leakage path between the covering 17 and the connection row 10, thereby improving the sealing performance of the connection assembly.

[0051] Please refer to Figures 3 to 5 The controller housing 11 has a narrowing section 111. When the controller housing 11 is connected to the motor housing 12, the narrowing section 111 is located inside the motor housing 12, and the sealing ring 13 is sleeved outside the narrowing section 111. Figure 3 and Figure 5In the illustrated example, the motor housing 12 at least covers a portion of the controller housing 11, and the sealing ring 13 is sleeved between the outer wall of the controller housing 11 and the inner wall of the motor housing 12. The connection portion between the controller housing 11 and the motor housing 12 is provided with a narrowing section 111, which can reduce the production cost of the controller housing 11 on the one hand, and avoid the inconvenience caused by the excessive size of the housing on the other hand. Of course, in other embodiments, the controller housing 11 may also cover a portion of the motor housing 12. At this time, the sealing ring 13 should be sleeved between the outer wall of the motor housing 12 and the inner wall of the controller housing 11. Those skilled in the art can configure this according to actual conditions.

[0052] In another embodiment, the utility model also provides an electric bridge drive system, including: a drive motor (not shown in the figure), a motor controller (not shown in the figure) and a transmission device (not shown in the figure); the drive motor is arranged in the motor housing 12, the motor controller is arranged in the controller housing 11, and the drive motor drives the transmission device to output torque to the external structure; the motor controller includes an inverter (not shown in the figure), the inverter is connected to the drive motor through the connection assembly as described above, and is used to output electric energy to the drive motor. It should be noted that the inverter is a core component of the motor controller, which can convert DC power into a predetermined voltage or frequency-modulated voltage-regulated AC power. In this embodiment, the inverter is arranged in the controller housing 11, and is connected to the motor housing 12 through the above-mentioned connection assembly to transmit electric energy to the drive motor located inside the motor housing 12. The drive motor outputs torque to the external component through the transmission device under the drive of electric energy. The transmission device can be a gear and a worm gear. The specific structure and use principle of the transmission device can refer to the prior art, and this application will not repeat it here. With such configuration, by using the above-mentioned connection assembly in the connection between the controller housing 11 and the motor housing 12, the production cost of the overall component is reduced, and the space utilization rate is improved, so that the entire electric bridge drive system meets the development trend of miniaturization and low cost. It should be noted that this embodiment only uses the motor housing 12 and the controller housing 11 as examples to illustrate the connection assembly, which does not mean that the connection assembly provided in this embodiment can only be used in the connection between the motor housing 12 and the controller housing 11. As long as there is an application scenario with sealing requirements, the connection assembly mentioned in the embodiment can be used. Those skilled in the art can configure the application scenario of the connection assembly according to actual conditions, and this embodiment does not limit this.

[0053] In summary, in the connection component and the electric bridge drive system provided by the embodiments of the utility model, the connection component includes: a connection row, a controller housing, a motor housing and a sealing ring; the connection row is penetrated by the controller housing and the motor housing, wherein an accommodating cavity is provided between the controller housing and the motor housing, and the sealing ring is provided in the accommodating cavity to prevent the refrigerant from leaking from the gap between the motor housing and the controller housing; an infusion cavity is provided between the side wall of the connection row and the inner wall of the controller housing, and the infusion cavity is filled with sealing material to prevent the refrigerant from leaking from the gap between the connection row and the controller housing.

[0054] With such configuration, the present application can prevent the refrigerant from leaking from the gap between the controller housing and the motor housing by sleeve-arranging the sealing member between the outer wall of the controller housing and the inner wall of the motor housing; at the same time, the sealing material is poured into the pouring cavity between the connecting row and the controller housing, which can prevent the refrigerant from leaking from the gap between the connecting row and the controller housing; compared with the solution in the prior art that requires two sealing rings and one sealing material to achieve sealing, the present application only needs one sealing ring and one sealing material to achieve sealing, which reduces the production cost, and at the same time, by pouring the sealing material into the pouring cavity, the space utilization rate can be improved, which is conducive to the development trend of miniaturization and low cost, and the structural rigidity can be further improved after the sealing material is cured;

[0055] Furthermore, by providing a covering member on the outside of the connecting row, the sealing effect of the sealing material can be further improved. At the same time, the covering member cooperates with the sealing material to prevent the refrigerant from leaking from the gap between the covering member and the connecting row.

[0056] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A connection assembly, characterized in that: include: Connecting row, controller housing, motor housing and sealing ring; The connecting row is provided through the controller housing and the motor housing, wherein a receiving cavity is provided between the controller housing and the motor housing, and the sealing ring is provided in the receiving cavity to prevent the refrigerant from leaking from the gap between the motor housing and the controller housing; A filling cavity is provided between the side wall of the connecting row and the inner wall of the controller housing. The filling cavity is filled with sealing material to prevent the refrigerant from leaking from the gap between the connecting row and the controller housing.

2. The connection assembly according to claim 1, characterized in that The sealing ring comprises a radial sealing ring, and the radial sealing ring seals the accommodating cavity along the radial direction of the connecting row, so as to prevent the refrigerant from flowing in the axial direction of the connecting row.

3. The connection assembly according to claim 1, characterized in that The sealing ring comprises an axial sealing ring, and the axial sealing ring seals the accommodating cavity along the axial direction of the connecting row, so as to prevent the refrigerant from flowing in the radial direction of the connecting row.

4. The connection assembly according to claim 2 or 3, characterized in that: A covering piece is disposed outside the connecting bar, and the covering piece cooperates with the sealing material to prevent the refrigerant from leaking from the gap between the connecting bar and the controller housing.

5. The connection assembly according to claim 4, characterized in that The covering member at least covers the connection portion between the connection row and the controller housing.

6. The connection assembly according to claim 4, characterized in that The covering member protrudes outwardly along the radial direction of the connection row to form a protruding portion, and the protruding portion abuts against the controller housing.

7. The connection assembly according to claim 6, characterized in that The covering piece is further provided with a sleeve portion, and the sleeve portion and the protruding portion are arranged along the axial direction of the connecting row. The controller housing is provided with a through hole, and the minimum radial length of the through hole is adapted to the sum of the radial lengths of the connecting row and the sleeve portion.

8. The connection assembly according to claim 2 or 3, characterized in that: The connection assembly also includes a seal, which is sleeved on the connection portion between the connection row and the controller housing, and cooperates with the sealing material to prevent the refrigerant from leaking from the gap between the connection row and the controller housing.

9. The connection assembly according to claim 1, characterized in that: The controller housing has a narrowed section, and when the controller housing is connected to the motor housing, the narrowed section is located inside the motor housing, and the sealing ring is sleeved outside the narrowed section.

10. An electric bridge drive system, characterized in that: include: Drive motor, motor controller and transmission; The drive motor is disposed in the motor housing, the motor controller is disposed in the controller housing, and the drive motor drives the transmission device to output torque to an external structure; The motor controller comprises an inverter, and the inverter is connected to the drive motor via a connecting assembly as claimed in any one of claims 1 to 9, and is used for outputting electric energy to the drive motor.

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