Lubricating and cooling structure for electric drive assembly bearing

Abstract

The utility model provides a lubricating and cooling structure for a bearing of an electric drive assembly, which comprises a stator winding arranged in a motor, a cooling main oil duct arranged in a shell of the electric drive assembly, and an oil pipe made of insulating materials, and the oil pipe is arranged between the stator winding and the shell of the electric drive assembly. A first oil hole and a second oil hole are formed in the two ends of the oil pipe respectively, the first oil hole and the second oil hole are communicated through a hollow oil way arranged in the oil pipe, the second oil hole of the oil pipe is connected with an oil guide pipe of the electric drive assembly bearing, and the first oil hole of the oil pipe is matched with the cooling main oil way and used for lubricating and cooling the electric drive assembly bearing. By arranging the oil pipe between the stator winding and the electric drive assembly shell, the space utilization rate is improved, the axial length of the electric drive assembly is reduced, and the design requirement for high compactness of the electric drive assembly is met. According to the structure, the number of internal movable parts is reduced, and the complexity and the fault risk of the system are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electric drive assemblies, and in particular to a lubrication and cooling structure for electric drive assembly bearings. Background Art

[0002] Electric drive assemblies (EVDs) are widely used in electric vehicles, and their internal bearings need to be fully lubricated and cooled to ensure efficient operation of the motor and extend its service life. However, existing lubrication and cooling technologies have many shortcomings and are difficult to meet this demand.

[0003] In the existing technology, there are several typical lubrication and cooling solutions:

[0004] Splash lubrication and shell oil receiving and oil guiding rib lubrication and cooling solution: This solution uses splash lubrication oil to achieve bearing lubrication, and uses the oil receiving and oil guiding ribs on the shell to guide the lubricating oil. However, the effect of splash lubrication is greatly affected by factors such as motor speed and vehicle inclination angle, the amount of lubricating oil is unstable, and the lubrication effect is poor. Especially at high speeds, this solution is difficult to meet the lubrication needs of the bearing.

[0005] Casting oil channel and CNC processing scheme: This scheme uses cast oil channels and forms a complex oil channel network through CNC processing. However, since the oil channel drilling can only be carried out along a straight line, it is necessary to connect multiple sections of broken line casting oil channels, which increases the complexity and cost of casting. In addition, deep hole processing is difficult and the angles are different, resulting in high machining costs. At the same time, the flow resistance of the oil in the intersection area of ​​the oil channel broken line is large, which affects the lubrication effect.

[0006] Metal oil pipe and sealing solution on both sides of the oil pipe: This solution uses metal oil pipes to achieve lubrication. Although the inner diameter and wall thickness of the oil pipe can be reduced and the processing difficulty is relatively low, more accessories are required, and there are more moving parts in the motor cavity. There is a risk of the fixing bolts falling off, which may cause serious consequences. In addition, since the metal oil pipe has conductive properties, in order to ensure electrical insulation, the axial space needs to be increased, resulting in an increase in the overall size of the eVD.

[0007] In summary, the existing technical solutions have problems in terms of unstable lubrication effect, high processing cost, complex structure, etc., and it is difficult to meet the needs of efficient and stable lubrication. An improved lubrication and cooling technology is urgently needed to solve the deficiencies in the existing technology and provide a more reliable and efficient bearing lubrication solution.

[0008] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0009] In view of the problems in the prior art, the purpose of the utility model is to provide a lubrication and cooling structure for the bearings of an electric drive assembly. By adopting oil holes and hollow oil passages set in oil pipes made of insulating materials, effective distribution of oil pressure and control of the amount of lubricating oil are achieved, thereby ensuring electrical insulation in a small space.

[0010] The embodiment of the utility model provides a lubrication and cooling structure for the bearing of an electric drive assembly, comprising a stator winding arranged inside a motor and a cooling main oil channel arranged in a housing of the electric drive assembly, the lubrication and cooling structure comprising an oil pipe made of insulating material, the oil pipe being arranged between the stator winding and the housing of the electric drive assembly and being arranged in the electrical insulation gap of the stator winding, a first oil hole and a second oil hole being arranged at both ends of the oil pipe respectively, the first oil hole and the second oil hole being connected by a hollow oil path arranged inside the oil pipe, the second oil hole of the oil pipe being connected to an oil guide pipe of the bearing of the electric drive assembly, the first oil hole of the oil pipe being matched with the cooling main oil channel for lubricating and cooling the bearing of the electric drive assembly. By arranging an oil pipe made of insulating material in the insulation gap, not only the electrical insulation performance is ensured, but also the weight of the oil pipe is effectively reduced, the manufacturing cost is reduced, the reliability of the overall structure is improved, and the lubrication and cooling effect of the bearing of the electric drive assembly is effectively improved. At the same time, the internal space utilization rate of the electric drive assembly is optimized, the axial length and moving parts are reduced, and the manufacturing cost and maintenance difficulty are reduced.

[0011] Furthermore, the diameter of the second oil hole is smaller than the diameter of the first oil hole.

[0012] Benefiting from the design that the diameter of the second oil hole is smaller than that of the first oil hole, the oil pipe can ensure the stable flow and pressure distribution of the internal fluid. When cooperating with the oil pressure distribution in the main oil channel of the overall lubrication and cooling structure, this design can effectively stabilize the oil pressure and the flow speed of the internal fluid, thereby ensuring that the electric drive assembly bearing obtains a more stable and uniform lubrication and cooling effect, and improving the overall performance and reliability of the system.

[0013] Furthermore, the diameter of the oil passage decreases from the first oil hole to the second oil hole.

[0014] Benefiting from the design of the oil path diameter from the first oil hole to the second oil hole from large to small, the utility model can achieve stable flow and stable pressure distribution of the internal fluid, ensuring that the internal lubricating oil can fully lubricate the electric drive assembly bearing while efficiently cooling, significantly improving the service life and overall operating performance of the bearing. At the same time, the design effectively reduces the resistance in the oil pipe, increases the flow speed of the lubricating oil and the response speed of the system, thereby improving the working efficiency and reliability of the electric drive assembly.

[0015] Furthermore, the ratio of the length of the oil path to the diameter of the second oil hole is greater than 50:1.

[0016] Benefiting from the design that the ratio of the length of the oil circuit and the diameter of the second oil hole is greater than 50:1, the utility model can significantly improve the flow stability of the oil in the oil circuit, ensure that the lubricating oil maintains appropriate pressure and speed during the flow process, and avoid eddy currents and pressure loss.

[0017] Furthermore, the diameter of the second oil hole is 0.7 mm.

[0018] Benefiting from the design of the second oil hole with a diameter of 0.7mm, the utility model can accurately control the flow rate and oil pressure distribution of the lubricating oil, ensuring that the lubricating oil maintains appropriate pressure and flow at the electric drive assembly bearing. This not only avoids the adverse effects caused by excessively high or low oil pressure, but also effectively stabilizes the oil pressure of the overall system and improves the working efficiency and reliability of the lubrication and cooling system.

[0019] Furthermore, the oil pipe housing includes at least one stepped limiting structure, and the stepped limiting structure includes a stepped structure formed by a sudden change in the outer diameter of the oil pipe arranged along the length direction of the oil pipe.

[0020] Benefiting from the design of the stepped limiting structure, the utility model can achieve accurate limiting cooperation between the oil pipe and the external matching parts, thereby stabilizing the position of the oil pipe and preventing the oil pipe from moving due to vibration or other external forces and causing poor lubrication. At the same time, this structure simplifies the installation process, improves assembly efficiency and the stability of the overall structure.

[0021] Furthermore, the contact surface between the electric drive assembly housing and the lubrication and cooling structure is matched with the stepped limiting structure and is provided with a protrusion structure for limiting the oil pipe.

[0022] Benefiting from the coordinated design of the stepped limiting structure and the protruding structure, the utility model can ensure that the oil pipe always maintains a stable position during installation and operation, preventing the oil pipe from moving due to vibration or external force, thereby avoiding the problems of poor lubrication and reduced cooling effect. At the same time, the design of the structure simplifies the installation process, improves assembly efficiency and the stability of the overall structure, thereby improving the reliability and service life of the lubrication and cooling system, and ensuring the efficient operation of the electric drive assembly.

[0023] Furthermore, the insulating material is plastic.

[0024] Benefiting from the fact that the oil pipe is made of plastic as an insulating material, the utility model not only ensures the electrical insulation performance, but also effectively reduces the weight of the oil pipe, simplifies the structure, and reduces the manufacturing cost. The use of plastic materials also improves the corrosion resistance and durability of the oil pipe, further enhances the reliability and service life of the lubrication and cooling system, thereby ensuring the efficient and stable operation of the electric drive assembly.

[0025] Furthermore, the electrical insulation gap is 6mm-8mm. Benefiting from the use of insulating oil pipes, the utility model not only ensures the electrical insulation performance, but also allows the oil pipes to be arranged in the electrical insulation gap to avoid electrical short circuit problems that may be caused by the use of metal oil pipes. Moreover, the oil pipes are arranged close to the stator windings, shortening the axial size of the motor. The use of insulating materials such as plastics makes the oil pipes have good corrosion resistance and light weight, further improving the overall performance and reliability of the electric drive assembly. Through this design, the structure of the electric drive assembly is more compact, the lubrication and cooling effects are more significant, and the service life of the bearings and motors is extended.

[0026] Furthermore, a gasket is provided on the outer peripheral surface of the oil pipe on the side close to the first oil hole. The gasket is used to enhance the sealing performance of the oil pipe, prevent oil leakage, improve the tightness of the fit between the oil pipe and its external fittings, and further ensure the stability and reliability of the oil circuit. The gasket contacts the external fittings and achieves effective sealing through elastic deformation, thereby providing a more stable oil pressure during the lubrication and cooling process and avoiding the problem of insufficient lubrication due to poor sealing. By providing a gasket on the outer peripheral surface of the oil pipe, the sealing performance of the oil pipe is effectively improved, ensuring the stable operation of the oil circuit system. The design of the gasket not only enhances the tightness of the fit between the oil pipe and the housing, preventing oil leakage, but also improves the stability of the lubrication and cooling effects, further ensuring the efficient operation and service life of the electric drive assembly.

[0027] Furthermore, the lubrication and cooling structure also includes a hole elastic retaining ring, which is arranged between the oil pipe and the cooling main oil channel. The hole elastic retaining ring ensures the effective sealing and firm connection between the oil pipe and the cooling main oil channel, and prevents the cross contamination between the lubricating oil and impurities in the environment, thereby improving the reliability and service life of the overall equipment. Thanks to this solution, the lubrication and cooling structure effectively solves the key problems of lubrication and cooling of the bearings of the electric drive assembly. Through the precise design of the hole elastic retaining ring and the optimized material selection, the tight connection and efficient sealing between the oil pipe and the cooling main oil channel are achieved. This not only improves the efficiency and stability of the lubricating oil during operation, but also reduces the risk of damage to the equipment due to failure of the lubrication system, and further improves the overall performance and reliability of the electric drive assembly.

[0028] Furthermore, the lubrication and cooling structure also includes a screw plug with a sealing gasket, which is arranged on the outside of the electric drive assembly housing in conjunction with the first oil hole and is spirally connected to the electric drive assembly housing. This design not only simplifies the installation and removal process of the oil pipe, but also effectively improves the convenience and efficiency of equipment maintenance. Benefiting from the above technical solution, the lubrication and cooling structure, while ensuring the effective transportation of lubricating oil and coolant, significantly simplifies the installation and removal operations of the oil pipe through the setting of the screw plug with a sealing gasket, thereby improving the maintenance efficiency of the equipment. This design not only optimizes the reliability and operational stability of the equipment, but also reduces the time cost and manpower investment in the maintenance process, thereby reducing the overall operating cost and extending the service life of the equipment.

[0029] Furthermore, the lubrication and cooling structure also includes a sealing gasket, which is arranged between the second oil hole of the oil pipe and the oil guide pipe of the electric drive assembly bearing. The setting of the sealing gasket effectively prevents the leakage of lubricating oil and the entry of external contaminants by adding a sealing barrier, thereby ensuring the cleanliness and efficient operation of the lubrication system. Thanks to this technical solution, the lubrication and cooling structure in the electric drive assembly has been significantly improved. By adding a sealing gasket between the second oil hole of the oil pipe and the oil guide pipe of the electric drive assembly bearing, the sealing performance of the system is effectively improved, and the leakage of lubricating oil and the intrusion of external contaminants are prevented. This design not only ensures the cleanliness and efficient operation of the lubrication system, reduces the maintenance frequency and cost of the equipment, but also extends the service life of the electric drive assembly, further improving the reliability and performance stability of the overall equipment.

[0030] Furthermore, the inner wall surface of the oil circuit is provided with a protrusion or a spiral structure to increase the stability of the fluid flow in the oil circuit and improve the heat dissipation effect. The protrusion or spiral structure forms a turbulent flow zone inside the oil circuit, so that the oil generates turbulence during the flow process, thereby improving the heat transfer efficiency and enhancing the heat dissipation effect. This design not only helps to maintain the uniform flow of the oil and avoid local overheating, but also effectively prevents oil circuit blockage and improves the stability and reliability of the lubrication and cooling effects. By providing a protrusion or a spiral structure on the inner wall of the oil circuit, the stability and heat dissipation effect of the fluid are enhanced, and the heat transfer efficiency of the oil is effectively improved. This design not only ensures the uniform flow of the oil and prevents local overheating, but also reduces the risk of oil circuit blockage, thereby improving the overall stability and reliability of the electric drive assembly lubrication and cooling system, and ensuring the efficient operation and long life of the motor.

[0031] The lubrication and cooling structure for the electric drive assembly bearing provided by the utility model has the following advantages:

[0032] The lubrication and cooling structure for the electric drive assembly bearing provided by the utility model improves the space utilization, reduces the axial length of the electric drive assembly, and meets its high compactness design requirements by arranging the oil pipe between the stator winding and the electric drive assembly housing and in the electrical insulation gap of the stator winding. This structure reduces the number of internal moving parts, reduces the complexity of the system and the risk of failure. The oil pipe is made of insulating material, which effectively solves the electrical insulation problem that may be caused by the oil pipe material in the prior art, ensures the electrical safety inside the electric drive assembly, ensures the full lubrication of the bearing, reduces the wear and heat of the bearing, and improves the operating efficiency and life of the electric drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0034] Figure 1 It is a cross-sectional view of an oil pipe according to an embodiment of the utility model;

[0035] Figure 2 It is a cross-sectional schematic diagram of a lubrication and cooling structure for an electric drive assembly bearing according to an embodiment of the utility model.

[0036] Reference numerals:

[0037] 110 first oil hole 120 second oil hole

[0038] 130 Oil circuit 140 Stepped limit structure

[0039] 150 Washer 100 Oil pipe

[0040] 200 Circlip for hole 300 Screw plug with sealing gasket

[0041] 910 Electric drive assembly housing 911 Cooling main oil channel

[0042] 920 Stator winding 930 Electric drive assembly bearing

[0043] 931 Oil pipe DETAILED DESCRIPTION

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that the utility model will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. "Or" and "or" in the specification may both mean "and" or "or". Although the terms "upper", "lower", "between", etc. may be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the directions of the examples in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0045] The utility model provides an oil pipe, wherein a first oil hole and a second oil hole are respectively arranged at both ends of the oil pipe, and the first oil hole and the second oil hole are connected by a hollow oil path arranged inside the oil pipe, and the diameter of the oil path decreases from the first oil hole to the second oil hole, and the oil pipe is made of insulating material. The oil path inside the oil pipe is designed as a gradual structure from large to small, which ensures that the lubricating oil can be stably delivered to the bearing position of the electric drive assembly under various working conditions. The optional oil pipe housing includes at least one stepped limiting structure, and the stepped limiting structure achieves accurate positioning of the oil pipe during installation by matching with the external installation position, and prevents the oil pipe from axial or radial movement during operation. The use of insulating material not only improves the electrical insulation performance of the oil pipe, but also effectively reduces the electrical interference between the oil pipe and the surrounding components. By adopting an oil pipe made of insulating material and arranging a stepped limiting structure on its housing, the oil pipe is stably installed in the housing, and the problem of unstable lubrication and cooling effects in the prior art is effectively solved. The gradient oil path design of the oil pipe improves the stability and efficiency of lubricating oil delivery, further enhancing the overall performance and service life of the electric drive assembly.

[0046] The utility model also provides a lubrication and cooling structure for the bearing of an electric drive assembly, comprising a stator winding arranged inside the motor and a cooling main oil channel arranged in the housing of the electric drive assembly, the lubrication and cooling structure comprising the above-mentioned oil pipe, the oil pipe being arranged between the stator winding and the housing of the electric drive assembly and arranged in the electrical insulation gap of the stator winding, the second oil hole of the oil pipe being connected to the oil guide pipe of the bearing of the electric drive assembly, the first oil hole of the oil pipe being matched with the cooling main oil channel, and being used for lubrication and cooling of the bearing of the electric drive assembly. Through this structural design, it is possible to ensure that the lubricating oil is stably and effectively transmitted from the cooling main oil channel to the bearing of the electric drive assembly through the oil pipe, so as to achieve continuous lubrication and cooling of the bearing, thereby improving the operating efficiency and reliability of the electric drive assembly. The lubrication and cooling structure realizes stable transmission of the lubricating oil through the oil pipe arranged between the stator winding and the housing of the electric drive assembly. The stepped limiting structure ensures the precise positioning of the oil pipe during the installation process, and avoids the problem of poor lubrication effect caused by loose oil pipe. The application of insulating materials improves the electrical insulation performance of the oil pipe, reduces electrical interference, and achieves efficient delivery of lubricating oil by optimizing the design of the oil circuit, effectively improving the overall performance and service life of the electric drive assembly.

[0047] Combine the following Figures 1-2 The working principle of the lubrication and cooling structure for the bearing of the electric drive assembly according to one embodiment of the utility model is specifically introduced. It is to be understood that the following description is only an example and is not intended to limit the scope of protection of the utility model.

[0048] like Figures 1-2 As shown, in this embodiment, an oil pipe 100 is provided, and a first oil hole 110 and a second oil hole 120 are respectively provided at both ends of the oil pipe 100, and the first oil hole 110 and the second oil hole 120 are connected by a hollow oil passage 130 provided inside the oil pipe 100, and the oil pipe 100 is made of insulating material. The oil pipe 100 is made of insulating material, which not only ensures electrical insulation performance, but also effectively reduces the weight of the oil pipe 100, simplifies the structure, reduces the manufacturing cost, improves the overall reliability of the lubrication structure, and ensures the efficient operation and long life of the motor.

[0049] In order to further improve the installation stability and positioning accuracy of the oil pipe, the housing of the oil pipe 100 optionally includes at least one stepped limiting structure 140. Figure 1 The step-type limiting structure 140 is arranged along the length direction of the oil pipe 100. The step-shaped structure formed by the sudden change of the outer diameter of the oil pipe can effectively prevent the axial sliding and displacement of the oil pipe during operation. Figure 1As shown, it can include multiple steps, and the height variation between the steps can be designed according to the specific application requirements to achieve the best limiting effect. These steps can be manufactured in an integrated manner with the oil pipe, or they can be formed by post-processing. In addition, the shape and number of the step-type limiting structure 140 can also be adjusted according to actual needs, for example, it can be annular steps, stepped steps, etc., to adapt to different installation environments and usage requirements. The step-type limiting structure 140 of the utility model is not limited to the above-mentioned embodiments. Any corresponding limiting structure obtained by improvement or modification by a technician in this field under the enlightenment of the present invention should be included in the protection scope of the utility model.

[0050] In addition, the oil pipe 100 of the present invention can have different overall shapes. Figure 1 The embodiment shown is for schematic illustration only. The first oil hole 110 and the second oil hole 120 may also be arranged not to be on the same axis, and the connection between the first oil hole 110 and the second oil hole 120 may be achieved through wiring connection methods of different oil circuits 130, thereby adapting to different installation environments and actual requirements.

[0051] Benefiting from the technical solution of the utility model, the stepped limiting structure 140 ensures the stable fixation of the oil pipe 100, avoiding the problem of poor lubrication effect caused by the movement of the oil pipe 100; the use of insulating materials not only improves the electrical insulation performance, but also effectively reduces the weight of the oil pipe 100, simplifies the structure, reduces the manufacturing cost, and improves the overall reliability of the lubrication structure; in addition, the application of different oil circuit 130 routing methods enables the oil pipe 100 to adapt to more installation environments and requirements, ensuring the efficient operation and long life of the motor.

[0052] In order to further improve the lubrication and cooling effect of the electric drive assembly bearing and ensure the stable flow and pressure distribution of the internal fluid, the diameter of the second oil hole 120 is optionally smaller than the diameter of the first oil hole 110. This design can well stabilize the oil pressure distribution when cooperating with the oil pressure distribution in the main oil channel connected thereto, and stabilize the flow speed of the internal fluid, thereby ensuring that the lubricated parts or structures obtain a more stable and uniform lubrication and cooling effect. In addition, this embodiment is only a preferred embodiment, and the specific size of the oil hole can be adjusted according to actual needs. For example, different combinations of the diameters of the first oil hole 110 and the second oil hole 120 can be selected according to the flow characteristics of different fluids and the technical requirements of the use environment to optimize the oil pressure distribution and flow effect.

[0053] In order to further improve the lubrication and cooling effect of the electric drive assembly bearing and ensure the stable flow and pressure distribution of the internal fluid, optionally, the diameter of the oil circuit 130 decreases from the first oil hole 110 to the second oil hole 120. This design can determine the pressure of the fluid in the oil circuit and then control the flow rate, thereby effectively improving the lubrication and cooling efficiency and ensuring that the bearing is always in the best condition during operation. In addition, this embodiment is only a preferred embodiment, and the specific diameter change of the oil circuit can be adjusted according to actual needs. For example, different oil circuit diameter gradient methods can be selected according to the flow characteristics and use environment of different coolants or lubricating oils to optimize the flow rate and pressure distribution effect of the fluid.

[0054] In order to further improve the lubrication and cooling effect of the electric drive assembly bearing, optionally, the ratio of the length of the oil circuit 130 to the diameter of the second oil hole 120 is greater than 50:1. By limiting the ratio of the length of the oil circuit to the diameter of the second oil hole to be greater than 50:1, the oil pressure distribution can be effectively adjusted to ensure that the lubricating oil can be stably delivered to the electric drive assembly bearing. This embodiment is only a preferred embodiment, and the ratio of the length of the oil circuit to the diameter of the second oil hole can be adjusted according to specific needs. For example, an oil circuit with a ratio of 60:1 or 100:1 can be selected to meet the lubrication requirements and oil pressure control requirements of the narrow space where different electric drive assembly bearings are located. This embodiment can achieve stable flow and pressure distribution of lubricating oil, ensure good lubrication effect of the electric drive assembly bearing during operation, extend the service life of the bearing, and improve the overall operation reliability of the electric drive assembly. Compared with the optional technical solutions in the prior art, this embodiment uses an oil pipe made of insulating material, especially plastic. Under the parameters that the length of the oil circuit 130 and the diameter of the second oil hole 120 are greater than 50:1, its machining process is simpler and more cost-saving.

[0055] Optionally, the ratio of the length of the oil circuit 130 to the diameter of the second oil hole 120 is 100: 1. This design ensures the stability and reliability of the oil lubrication system during efficient operation, while reducing the complexity and cost of the design of the oil circuit 130.

[0056] Optionally, the length of the oil passage 130 is 70 mm, and the diameter of the narrow part of the oil passage 130 is 3 mm. Taking this specific aperture design as an example, the oil pipe 100 of the utility model can effectively control the flow and pressure of the oil, ensure the balanced distribution of oil in various parts of the lubrication system, and avoid the oil pressure distribution problem that may occur when the oil pipe 100 is in the lubrication structure system.

[0057] In order to further optimize the lubrication effect and oil pressure control of the oil pipe, the diameter of the second oil hole 120 is optionally 0.7 mm. By limiting the diameter of the second oil hole to 0.7 mm, the flow rate and pressure of the lubricating oil can be effectively controlled to ensure that the lubricating oil can be stably delivered to the bearing of the electric drive assembly. In addition, this embodiment is only a preferred embodiment, and the diameter of the second oil hole can be adjusted according to specific needs. For example, an oil hole with a diameter of 0.6 mm or 0.8 mm can be selected to meet different lubrication needs and oil pressure control requirements.

[0058] In other embodiments, the design of the utility model is not limited to the above specific examples, and can also be adjusted and changed according to specific needs and design goals. For example, different lengths of the oil circuit 130 and diameters of the second oil hole 120 can be used to adapt to the oil pressure distribution requirements under different working conditions. Therefore, the technical solution disclosed in this article has a high degree of flexibility and substitutability.

[0059] In order to further optimize the design of the oil pipe 100, especially for application in lubrication and cooling systems, the oil pipe 100 is provided with a gasket 150 on its outer peripheral surface near the first oil hole 110. These gaskets 150 can be annular and form a certain gap with the outer diameter of the oil pipe 100 to ensure that the movement of the oil pipe 100 in the axial or radial direction can be effectively restricted during the installation and use of the oil pipe 100, and at the same time provide additional sealing functions to prevent the leakage of lubricating oil or cooling medium. The specific shape and size of the gasket 150 of the utility model can be adjusted and optimized according to specific engineering requirements. For example, gaskets 150 of different materials can be selected to adapt to different working environments, or multiple gaskets 150 can be combined to enhance the sealing effect. In addition, it is also possible to consider setting gaskets 150 at different positions of the oil pipe 100 to meet different installation requirements and functional requirements. By setting the gasket 150, the stability and safety of the oil pipe 100 during installation and use are effectively enhanced, while the sealing performance of the lubrication and cooling system is improved, and the potential risk of liquid leakage is reduced, thereby further optimizing the reliability and durability of the overall system.

[0060] In order to further enhance the lubrication and cooling effect of the oil pipe 100, the inner wall surface of the oil circuit 130 is provided with a spiral structure, which is formed along the inner wall of the oil pipe 100 and can be a continuous spiral line or an intermittent spiral structure. This design helps to increase the contact area between the fluid and the inner wall when the lubricating oil or cooling medium flows, thereby improving the heat transfer efficiency and the motion stability of the fluid. In addition, the spiral structure can also effectively reduce the turbulence effect of the fluid in the oil circuit 130, reduce energy loss, and improve the energy efficiency ratio of the overall system. The specific shape and parameters of the spiral structure can be adjusted according to actual needs, such as the depth, angle and spacing of the spiral. In addition, other types of inner wall structures can also be considered, such as the inner wall of the oil circuit 130 is provided with a convex structure or a composite structure to achieve similar fluid stability and heat transfer optimization effects. By providing a spiral structure on the inner wall of the oil pipe 100, the flow stability and heat transfer efficiency of the lubricating oil or cooling medium are effectively improved, thereby further optimizing the lubrication and cooling effect of the electric drive assembly bearing 930, and improving the working performance and reliability of the system.

[0061] like Figure 2 As shown, in this embodiment, a lubrication and cooling structure for an electric drive assembly bearing is provided, including a stator winding 920 disposed inside the motor and a cooling main oil passage 911 disposed in the electric drive assembly housing 910. The lubrication and cooling structure includes the above-mentioned oil pipe 100, the oil pipe 100 is disposed between the stator winding 920 and the electric drive assembly housing 910 and the oil pipe 100 is disposed in the electrical insulation gap of the stator winding 920, the second oil hole 120 of the oil pipe 100 is connected to the oil guide pipe 931 of the electric drive assembly bearing 930, and the first oil hole 110 of the oil pipe 100 cooperates with the cooling main oil passage 911 to lubricate and cool the electric drive assembly bearing 930. The second oil hole 120 is connected to the oil guide pipe 931 of the electric drive assembly bearing 930 to provide lubricating oil to the bearing.

[0062] Optionally, the electrical insulation gap of the stator winding 920 is 6mm-8mm. Benefiting from the use of insulating oil pipes, the utility model not only ensures electrical insulation performance and avoids electrical short circuit problems that may be caused by the use of metal oil pipes, but also allows the oil pipes to be arranged close to the stator windings, shortening the axial size of the motor. The use of insulating materials such as plastics makes the oil pipes have good corrosion resistance and light weight, further improving the overall performance and reliability of the electric drive assembly. Through this design, the structure of the electric drive assembly is more compact, the lubrication and cooling effects are more significant, and the service life of the bearings and motors is extended.

[0063] The electrical insulation gap of the stator winding is 6mm-8mm. The electrical insulation gap is also called creepage distance. Generally speaking, if a metal oil pipe is used, the oil pipe needs to be set outside the insulation gap of the stator winding, that is, the distance from the stator winding should be greater than 6mm. In this embodiment, the oil pipe 100 is set in the electrical insulation gap of the stator winding 920, which means that the whole or part of the oil pipe 100 is located in the space of the electrical insulation gap between the stator winding 920 and the electric drive assembly housing 910. The use of an insulating oil pipe can be set closer to the stator winding, and the distance can be less than the insulation gap, shortening the axial size of the motor. Since the oil pipe made of insulating material is used, the oil pipe can be directly placed in the electrical insulation gap of the stator winding, which not only reduces the overall size of the motor, but also improves the efficiency of lubrication and cooling. Benefiting from the application of insulating materials, the utility model can not only ensure electrical insulation performance and avoid electrical short circuit problems that may be caused by metal oil pipes, but also can be arranged close to the stator winding to shorten the axial size of the motor. The use of plastic insulating materials makes the oil pipe have good corrosion resistance and light weight, further improving the overall performance and reliability of the electric drive assembly. Through this design, the structure of the electric drive assembly is more compact, the lubrication and cooling effects are more significant, and the service life of the bearings and motors is extended.

[0064] In order to further improve the efficiency and reliability of the lubrication and cooling structure, the lubrication and cooling structure in this embodiment also includes the design of a hole elastic retaining ring 200. The design of the oil pipe 100 is made of insulating material. The first oil hole 110 of the oil pipe 100 matches the cooling main oil channel 911 and is used to transfer cooling media such as lubricating oil; the second oil hole 120 is connected to the oil guide pipe 931 of the electric drive assembly bearing 930 to provide the required lubricating oil. A hole elastic retaining ring 200 is set between the oil pipe 100 and the cooling main oil channel 911. The retaining ring can ensure the sealed connection between the oil pipe 100 and the cooling main oil channel 911, prevent medium leakage, and ensure the normal flow of lubricating oil inside the system. In the above embodiment, the hole elastic retaining ring 200 can be designed with different materials and structures to adapt to different working environments and operating requirements. For example, the material of the retaining ring can be selected from rubber, silicone or elastic plastic, and its structural form can be annular, corrugated or spiral to ensure its reliability and durability under high pressure or high temperature environment. By providing the hole elastic retaining ring 200, the sealing performance and operational safety of the lubrication and cooling structure are effectively improved, and the effective transfer and use of lubricating oil and cooling liquid within the system are guaranteed, thereby extending the service life of the electric drive assembly and improving the stability and reliability of the system.

[0065] In order to further improve the efficiency and convenience of the lubrication and cooling structure, the lubrication and cooling structure in this embodiment also includes a design of a screw plug 300 with a sealing gasket. A hole is opened on the outside of the electric drive assembly housing 910 and provided with a thread. The oil pipe 100 can be installed at the corresponding design position of the electric drive assembly through this hole, which is convenient for the disassembly and maintenance of the oil pipe 100. The hole corresponds to the position of the first oil hole 110 inside the electric drive assembly housing 910. Through this hole, a screw plug with a sealing gasket is installed, and it is connected to the corresponding thread of the electric drive assembly housing 910 to ensure sealing and fixity, and prevent leakage of lubricating oil or cooling medium. In this embodiment, the design of the screw plug 300 with a sealing gasket can be adjusted and changed according to actual needs. For example, the material of the sealing gasket can be selected from rubber, silicone, etc. to adapt to the sealing requirements of different working environments; the thread specifications and design forms of the screw plug can also be changed according to specific requirements to ensure convenience and safety during installation and disassembly. By providing the screw plug 300 with a sealing gasket, the installation and maintenance process of the oil pipe 100 is effectively simplified, the maintainability and operational convenience of the system are improved, while the sealing and stability of the lubrication and cooling structure are ensured, thereby extending the service life of the electric drive assembly and improving the overall performance of the system.

[0066] In order to further improve the lubrication and cooling effect of the electric drive assembly, in this embodiment, the contact surface between the electric drive assembly housing 910 and the lubrication and cooling structure cooperates with the stepped limiting structure 140 of the oil pipe 100, and is provided with a protrusion structure to accurately limit the position and installation angle of the oil pipe 100, and ensure that the oil pipe 100 can be correctly installed at the predetermined position through a specific shape and size. At the same time, a protrusion structure is provided on each step of the stepped limiting structure 140, and these protrusion structures can cooperate with the outer surface of the oil pipe 100 or a specific installation component to form a stable connection and fixation to prevent the oil pipe 100 from moving or loosening during use. In this embodiment, the specific shape, number and size of the stepped limiting structure 140 and the protrusion structure can be adjusted according to specific engineering needs and design requirements. For example, the height and spacing of the protrusion structure can be adjusted to adapt to the installation of oil pipes 100 of different types and sizes; the shape and position of the protrusion structure can also be optimized according to the material and appearance characteristics of the oil pipe 100 to ensure the best installation effect and reliability. Through the coordinated design of the stepped limiting structure 140 and the protrusion structure, the installation accuracy and stability of the oil pipe 100 are effectively improved, and the oil pipe 100 is prevented from shifting or loosening due to vibration or external force during use, thereby ensuring the normal operation and long-term stability of the lubrication and cooling system, and further improving the overall performance and reliability of the electric drive assembly.

[0067] In order to further optimize the efficiency of the lubrication and cooling structure, the sealing gasket in this embodiment is designed as a key component located between the second oil hole 120 of the oil pipe 100 and the oil guide pipe 931 of the electric drive assembly bearing 930. The design of the sealing gasket takes into account the interface requirements between the oil pipe 100 and the oil guide pipe 931 of the electric drive assembly bearing 930. The sealing gasket is placed around the second oil hole 120 of the oil pipe 100 to ensure that an effective seal is formed in the oil lubrication system to prevent the lubricating oil from leaking or failing during transportation. In this embodiment, the specific shape and material of the sealing gasket can be adjusted according to actual application requirements. For example, different elastic materials or sealing structures can be used to adapt to the sealing requirements and use environment under different working conditions. In addition, the installation position and method of the sealing gasket can also be optimized according to the design features of the oil pipe 100 and the oil guide pipe 931 to ensure the best sealing effect and system performance. Through the precise design and application of the sealing gasket, the leakage and loss of lubricating oil are effectively prevented, and the efficiency and reliability of the lubrication and cooling system are improved. The use of sealing gaskets not only protects the transportation and use safety of lubricating oil, but also extends the life of the electric drive assembly, providing users with a more reliable and lasting use experience.

[0068] Figures 1-2 In the embodiments, the oil pipe 100 is cylindrical as an example for explanation. In other embodiments, the oil pipe 100 can adopt other cross-sectional shapes, such as square, elliptical or polygonal, etc., to adapt to different installation environments and lubrication requirements. In all these embodiments, the key is to ensure that the oil pipe 100 can effectively connect the main cooling oil channel with the various components of the structure to be lubricated, such as the electric drive assembly bearing 930, and to ensure that the lubricating oil can flow smoothly according to the design requirements. The above-described embodiments are only a demonstration of the specific implementation of the utility model, and its purpose is to solve the technical problem of the lubrication and cooling structure in the electric drive assembly bearing 930, that is, how to effectively realize the delivery and cooling functions of the lubricating oil. By adopting oil pipes 100 of different shapes, different engineering requirements and space limitations can be flexibly responded to, thereby improving the stability and reliability of the system. Therefore, the technical effect of the technical solution is to enhance the applicability and flexibility of the lubrication and cooling structure, so that it can better meet the lubrication and cooling requirements of the electric drive assembly bearing 930, thereby improving the overall performance and service life of the equipment.

[0069] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A lubrication and cooling structure for an electric drive assembly bearing, comprising a stator winding arranged inside a motor and a cooling main oil channel arranged in a housing of the electric drive assembly, characterized in that: The lubrication and cooling structure includes an oil pipe made of insulating material, which is arranged between the stator winding and the housing of the electric drive assembly and in the electrical insulation gap of the stator winding. A first oil hole and a second oil hole are respectively arranged at both ends of the oil pipe. The first oil hole and the second oil hole are connected by a hollow oil passage arranged inside the oil pipe. The second oil hole of the oil pipe is connected to the oil guide pipe of the electric drive assembly bearing, and the first oil hole of the oil pipe cooperates with the cooling main oil channel for lubrication and cooling of the electric drive assembly bearing.

2. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: A diameter of the second oil hole is smaller than a diameter of the first oil hole.

3. The lubrication and cooling structure for electric drive assembly bearings according to claim 2, characterized in that: The diameter of the oil passage decreases from the first oil hole to the second oil hole.

4. The lubrication and cooling structure for electric drive assembly bearings according to claim 3 is characterized in that: The ratio of the length of the oil passage to the diameter of the second oil hole is greater than 50:

1.

5. The lubrication and cooling structure for the electric drive assembly bearing according to claim 4, characterized in that: The diameter of the second oil hole is 0.7 mm.

6. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: The oil pipe housing comprises at least one stepped limiting structure, and the stepped limiting structure comprises a stepped structure formed by a sudden change in the outer diameter of the oil pipe arranged along the length direction of the oil pipe.

7. The lubrication and cooling structure for the electric drive assembly bearing according to claim 6, characterized in that: The contact surface between the electric drive assembly housing and the lubrication and cooling structure cooperates with the stepped limiting structure to be provided with a protrusion structure for limiting the oil pipe.

8. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: The insulating material is plastic.

9. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: The electrical insulation gap is 6mm-8mm.

10. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: The oil pipe is provided with a gasket on its outer peripheral surface close to the first oil hole.

11. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: The lubrication and cooling structure also includes an elastic retaining ring for a hole, which is arranged between the oil pipe and the cooling main oil channel.

12. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: The lubrication and cooling structure also includes a screw plug with a sealing gasket, which is arranged on the outside of the electric drive assembly housing in conjunction with the first oil hole and is screwedly connected to the electric drive assembly housing.

13. The lubrication and cooling structure for electric drive assembly bearings according to claim 1, characterized in that: The lubrication and cooling structure further comprises a sealing gasket, which is arranged between the second oil hole of the oil pipe and the oil guide pipe of the electric drive assembly bearing.

14. The lubrication and cooling structure for an electric drive assembly bearing according to any one of claims 1 to 13, characterized in that: The inner wall surface of the oil passage is provided with a protrusion or a spiral structure.

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