Electric drive assembly cooling and lubrication system, method, and electric vehicle

Abstract

The application provides an electric drive assembly cooling and lubricating system, method and electric vehicle. The electric drive assembly cooling and lubricating system comprises a first mechanical gear pump, a second mechanical gear pump, an electric three-way proportional valve, an oil storage cavity, a heat exchanger and a differential gear. The first mechanical gear pump is coaxial and concentric with a motor shaft of the electric drive assembly. The second mechanical gear pump is coaxial and concentric with a gear shaft of the differential gear. The oil storage cavity is communicated with a first valve port of the electric three-way proportional valve through an oil pipe. The first mechanical gear pump is communicated with a second valve port of the electric three-way proportional valve. The second mechanical gear pump is communicated with a third valve port of the electric three-way proportional valve. The first mechanical gear pump and the second mechanical gear pump are communicated with the heat exchanger. The application realizes the cooling and lubrication of the electric drive assembly without separately setting the electric oil pump and the motor cooling water jacket. Compared with the prior art, the application has the advantages of simple structure and compact space.

Description

Technical Field

[0001] This application relates to the field of cooling and lubrication equipment, and more specifically, to an electric drive assembly cooling and lubrication system, method, and electric vehicle. Background Technology

[0002] There are two main types of cooling and lubrication systems for the electric drive assembly of existing new energy pure electric vehicles: Option 1, water cooling of the motor + splash lubrication of the differential reducer; In this option, the motor housing needs to be designed with a dedicated cooling water channel to achieve heat exchange through cooling water circulation. However, the design of the water channel increases the outer size of the motor, resulting in low space utilization of the whole vehicle, which is not conducive to the layout of the electric drive assembly. At the same time, the addition of the water channel increases the cost.

[0003] Option 2: Cooling and lubrication of the motor and differential reducer is achieved through active cooling and lubrication powered by an electric oil pump. Compared to Option 1, this option eliminates the need for a cooling water channel design and results in a smaller motor envelope size; however, the addition of an electric oil pump increases costs, and the efficiency factor of the electric oil pump leads to energy losses in the system. Summary of the Invention

[0004] The purpose of this application is to provide an electric drive assembly cooling and lubrication system, method, and electric vehicle, which can achieve cooling and lubrication of the electric drive assembly without the need for separate electric oil pumps and motor cooling water jackets. Compared with the prior art, the embodiments of this application have the advantages of simple structure and compact space.

[0005] In a first aspect, the present invention provides an electric drive assembly cooling and lubrication system, the electric drive assembly cooling and lubrication system comprising: a first mechanical gear pump, a second mechanical gear pump, an electric three-way proportional valve, an oil reservoir, a heat exchanger, and a differential reduction gear;

[0006] The first mechanical gear pump is mounted on the end of the motor shaft of the electric drive assembly and is coaxial and concentric with the motor shaft of the electric drive assembly;

[0007] The second mechanical gear pump is installed at the end of the differential reduction gear and is coaxial and concentric with the gear shaft of the differential reduction gear;

[0008] The differential gear is connected to the motor shaft of the electric drive assembly via a transmission.

[0009] The oil storage chamber is connected to the first valve port of the electric three-way proportional valve via an oil pipe. The first mechanical gear pump is connected to the second valve port of the electric three-way proportional valve. The second mechanical gear pump is connected to the third valve port of the electric three-way proportional valve. The first mechanical gear pump and the second mechanical gear pump are connected to the heat exchanger.

[0010] In the first aspect of this application, since the first mechanical gear pump is installed at the end of the motor shaft of the electric drive assembly and is coaxial and concentric with the motor shaft of the electric drive assembly, the motor shaft of the electric drive assembly can drive the first mechanical gear pump to rotate. The first mechanical gear pump can then deliver the lubricating oil in the oil storage chamber to the heat exchanger, and through the heat exchanger, the lubricating oil can cool and lubricate the electric drive assembly. Meanwhile, since the differential gear is connected to the motor shaft of the electric drive assembly, and the second mechanical gear pump is installed at the end of the differential gear and is coaxial with the gear shaft of the differential gear, the second mechanical gear pump can also generate power under the drive of the motor of the electric drive assembly to deliver the lubricating oil in the oil storage chamber to the heat exchanger. Through the heat exchanger, the lubricating oil can cool and lubricate the electric drive assembly. In addition, the differential gear can make the gear speed inside the second mechanical gear pump different from the gear speed inside the first mechanical gear pump, thereby realizing multiple oil supply modes based on this difference. Finally, the cooling and lubrication needs of the electric drive assembly can be flexibly adapted through multiple oil supply modes.

[0011] Compared with the prior art, the electric drive assembly cooling and lubrication system of the first aspect of this application can achieve cooling and lubrication of the electric drive assembly without the need for separate electric oil pumps and motor cooling water jackets, thus having the advantages of simple structure and compact space.

[0012] In an optional embodiment, the electric drive assembly cooling and lubrication system further includes an oil pipe injection device, which is connected to the heat exchanger and is used to inject lubricant from the oil pipe into the gears, bearings, and drive motor of the electric drive assembly.

[0013] In this optional embodiment, by connecting the oil pipe injection device to the heat exchanger, the lubricant in the oil pipe can be injected through the oil pipe injection device to the gears of the electric drive assembly, the bearings of the electric drive assembly, and the drive motor of the electric drive assembly.

[0014] In an optional embodiment, the oil pipe injection device includes a plurality of injection ports for injecting lubricating fluid from the oil pipe into the gears of the electric drive assembly, the bearings of the electric drive assembly, and the drive motor of the electric drive assembly.

[0015] In this optional embodiment, the lubricant in the oil pipe can be sprayed to different components of the electric drive assembly through a plurality of injection ports, such as the gears of the electric drive assembly, the bearings of the electric drive assembly, and the drive motor of the electric drive assembly.

[0016] In an optional embodiment, the electric drive assembly cooling and lubrication system further includes a filter placed in the oil reservoir and connected to the oil pipe for filtering the lubricating fluid entering the oil pipe.

[0017] In this optional embodiment, by placing a filter in the oil reservoir, the lubricating fluid entering the oil pipe can be filtered, thereby preventing impurities from being sprayed into the electric drive assembly through the oil pipe.

[0018] In an optional embodiment, the first mechanical gear pump is an eccentric internal meshing gear.

[0019] In an optional embodiment, the second mechanical gear pump is an eccentric internal meshing gear.

[0020] In a second aspect, the present invention provides a method for cooling and lubricating an electric drive assembly, wherein the method is applied to an electric drive assembly cooling and lubrication system as described in any of the foregoing embodiments, and the method includes:

[0021] When a low flow mode command is received, the second valve port of the electric three-way proportional valve is disconnected from the first valve port, and the third valve port of the electric three-way proportional valve is connected to the first valve port.

[0022] In this optional embodiment, since the second valve port of the electric three-way proportional valve is disconnected from the first valve port of the electric three-way proportional valve, and the third valve port of the electric three-way proportional valve is connected to the first valve port of the electric three-way proportional valve, the cooling lubricant can flow through the third valve port to the second mechanical gear pump. As a result, since the power of the second mechanical gear pump is less than that of the first mechanical gear pump, it can enter a low flow mode.

[0023] In an optional embodiment, the cooling and lubrication method for the electric drive assembly includes:

[0024] When a high flow mode command is received, the second valve port of the electric three-way proportional valve is controlled to connect with the first valve port of the electric three-way proportional valve, and the third valve port of the electric three-way proportional valve is controlled to disconnect from the first valve port of the electric three-way proportional valve.

[0025] In this optional embodiment, since the second valve port of the electric three-way proportional valve is connected to the first valve port of the electric three-way proportional valve, and the third valve port of the electric three-way proportional valve is disconnected from the first valve port of the electric three-way proportional valve, the cooling lubricant can flow through the second valve port to the first mechanical gear pump. As a result, since the power of the first mechanical gear pump is greater than that of the second mechanical gear pump, it can enter the high flow mode.

[0026] In an optional embodiment, the cooling and lubrication method for the electric drive assembly includes:

[0027] When a proportional flow mode command is received, based on the proportional data carried by the proportional flow mode command, the opening degree of the second valve port of the electric three-way proportional valve and the opening degree of the first valve port of the electric three-way proportional valve are controlled so that the opening degree of the second valve port of the electric three-way proportional valve and the opening degree of the first valve port of the electric three-way proportional valve meet the preset conditions.

[0028] In this optional embodiment, based on the proportional data carried by the proportional flow mode command, the opening degree of the second valve port of the electric three-way proportional valve and the opening degree of the first valve port of the electric three-way proportional valve can be controlled so that the opening degree of the second valve port of the electric three-way proportional valve and the opening degree of the first valve port of the electric three-way proportional valve meet the preset conditions.

[0029] Thirdly, the present invention provides an electric vehicle, the electric vehicle including an electric drive assembly cooling and lubrication system as described in any of the foregoing embodiments.

[0030] Since the electric vehicle of the third aspect of this application includes the electric drive assembly cooling and lubrication system of this application, it has the advantages of simple structure and compact space. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of an electric drive assembly cooling and lubrication system provided in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of an electric drive assembly cooling and lubrication system provided in an embodiment of this application;

[0034] Figure 3 This is a schematic flowchart of a cooling and lubrication method for an electric drive assembly provided in an embodiment of this application.

[0035] Icons: 1. First mechanical gear pump; 2. Second mechanical gear pump; 3. Electric three-way proportional valve; 4. Heat exchanger; 5. Oil reservoir; 6. Oil pipe injection device; 7. Differential reduction gear; 8. Motor of electric drive assembly; 9. Motor shaft of electric drive assembly. Detailed Implementation

[0036] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0037] Example

[0038] Please see Figure 1 , Figure 2 , Figure 1 This is a schematic diagram of the structure of an electric drive assembly cooling and lubrication system disclosed in an embodiment of this application. Figure 2 This is a schematic diagram of another electric drive assembly cooling and lubrication system disclosed in an embodiment of this application. Figure 1 and Figure 2 As shown, the electric drive assembly cooling and lubrication system of this application embodiment includes: a first mechanical gear pump 1, a second mechanical gear pump 2, an electric three-way proportional valve 3, an oil reservoir 5, a heat exchanger 4, and a differential reduction gear 7.

[0039] In this embodiment of the application, the first mechanical gear pump 1 is mounted on the end of the motor shaft 9 of the electric drive assembly and is coaxial and concentric with the motor shaft 9 of the electric drive assembly, wherein the motor shaft 9 of the electric drive assembly is connected to the motor 8 of the electric drive assembly in a transmission connection.

[0040] In this embodiment, the second mechanical gear pump 2 is installed at the end of the differential reduction gear 7 and is coaxial and concentric with the gear shaft of the differential reduction gear 7. In addition, the differential reduction gear 7 is connected to the motor shaft 9 of the electric drive assembly.

[0041] In this embodiment, the oil storage chamber 5 is connected to the first valve port of the electric three-way proportional valve 3 via an oil pipe, the first mechanical gear pump 1 is connected to the second valve port of the electric three-way proportional valve 3, the second mechanical gear pump 2 is connected to the third valve port of the electric three-way proportional valve 3, and the first mechanical gear pump 1 and the second mechanical gear pump 2 are connected to the heat exchanger 4.

[0042] In this embodiment, since the first mechanical gear pump 1 is mounted on the end of the motor shaft 9 of the electric drive assembly and is coaxial and concentric with the motor shaft 9 of the electric drive assembly, the motor shaft 9 of the electric drive assembly can drive the first mechanical gear pump 1 to rotate. The first mechanical gear pump 1 can then deliver the lubricating oil in the oil storage chamber 5 to the heat exchanger 4. Through the heat exchanger 4, the lubricating oil can cool and lubricate the electric drive assembly. Meanwhile, since the differential reduction gear 7 is connected to the motor shaft 9 of the electric drive assembly, and the second mechanical gear pump 2 is installed at the end of the differential reduction gear 7 and is coaxial and concentric with the gear shaft of the differential reduction gear 7, the second mechanical gear pump 2 can also generate power under the drive of the motor of the electric drive assembly to deliver the lubricating oil in the oil storage chamber 5 to the heat exchanger 4. Through the heat exchanger 4, the lubricating oil can cool and lubricate the electric drive assembly. In addition, the differential reduction gear 7 can make the gear speed inside the second mechanical gear pump 2 different from the gear speed inside the first mechanical gear pump 1, thereby realizing multiple oil supply modes based on this difference. Finally, the cooling and lubrication needs of the electric drive assembly can be flexibly adapted through multiple oil supply modes.

[0043] Compared with the prior art, the electric drive assembly cooling and lubrication system of this application embodiment can achieve cooling and lubrication of the electric drive assembly without the need for separate electric oil pumps and motor cooling water jackets, thus having the advantages of simple structure and compact space.

[0044] In an optional embodiment, the electric drive assembly cooling and lubrication system further includes an oil pipe injection device 6, which is connected to the heat exchanger 4. The oil pipe injection device is used to spray lubricant in the oil pipe onto the gears, bearings, and drive motor of the electric drive assembly.

[0045] In this optional embodiment, by connecting the oil pipe injection device 6 to the heat exchanger 4, the lubricant in the oil pipe can be injected into the gears of the electric drive assembly, the bearings of the electric drive assembly, and the drive motor of the electric drive assembly through the oil pipe injection device.

[0046] In an optional embodiment, the oil pipe injection device 6 includes a plurality of injection ports for injecting lubricating fluid from the oil pipe into the gears of the electric drive assembly, the bearings of the electric drive assembly, and the drive motor of the electric drive assembly.

[0047] In a preferred embodiment of this application, the oil pipe injection device 6 includes 5 injection ports, or it may include 6 injection ports.

[0048] In this optional embodiment, lubricating fluid in the oil pipe can be sprayed to different components of the electric drive assembly through several injection ports, such as gears, bearings, and drive motors of the electric drive assembly.

[0049] In an optional embodiment, the electric drive assembly cooling and lubrication system further includes a filter placed in the oil reservoir 5 and connected to the oil pipe for filtering the lubricating fluid entering the oil pipe.

[0050] In this optional embodiment, by placing the filter in the oil reservoir 5, the lubricating fluid entering the oil pipe can be filtered, thereby preventing impurities from being sprayed into the electric drive assembly through the oil pipe.

[0051] In an optional embodiment, the first mechanical gear pump 1 is an eccentric internal meshing gear.

[0052] In an optional embodiment, the second mechanical gear pump 2 is an eccentric internal meshing gear.

[0053] Furthermore, this application also provides a method for cooling and lubricating an electric drive assembly, wherein the method is applied to an electric drive assembly cooling and lubrication system as described in any of the foregoing embodiments. Please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic flowchart of a cooling and lubrication method for an electric drive assembly disclosed in an embodiment of this application. Figure 3 As shown, the electric drive assembly cooling and lubrication method of this application embodiment includes the following steps:

[0054] 101. When a low flow mode command is received, the second valve port of the electric three-way proportional valve is disconnected from the first valve port, and the third valve port of the electric three-way proportional valve is connected to the first valve port.

[0055] In this optional embodiment, since the second valve port of the electric three-way proportional valve 3 is disconnected from the first valve port, and the third valve port of the electric three-way proportional valve 3 is connected to the first valve port, the cooling lubricant can flow through the third valve port to the second mechanical gear pump 2. Furthermore, since the power of the second mechanical gear pump 2 is less than that of the first mechanical gear pump 1, it can enter a low-flow mode. Specifically, as... Figure 1 As shown, when the second valve port of the electric three-way proportional valve 3 is disconnected from the first valve port of the electric three-way proportional valve 3, and the third valve port of the electric three-way proportional valve 3 is connected to the first valve port of the electric three-way proportional valve 3, pipeline AC is connected and pipeline AB is disconnected.

[0056] In an optional implementation, the electric drive assembly cooling and lubrication method of this application embodiment includes:

[0057] When a high flow mode command is received, the second valve port of the electric three-way proportional valve 3 is connected to the first valve port of the electric three-way proportional valve 3, and the third valve port of the electric three-way proportional valve 3 is disconnected from the first valve port of the electric three-way proportional valve 3.

[0058] In this optional embodiment, since the second valve port of the electric three-way proportional valve 3 is connected to the first valve port of the electric three-way proportional valve 3, and the third valve port of the electric three-way proportional valve 3 is disconnected from the first valve port, the cooling lubricant can flow through the second valve port to the first mechanical gear pump 1. Furthermore, since the power of the first mechanical gear pump 1 is greater than that of the second mechanical gear pump 2, it can enter a high-flow mode. Specifically, as... Figure 1 As shown, when the second valve port of the electric three-way proportional valve 3 is connected to the first valve port of the electric three-way proportional valve 3, the third valve port of the electric three-way proportional valve 3 is disconnected from the first valve port of the electric three-way proportional valve 3, the AC pipeline is disconnected, and the AB pipeline is connected.

[0059] In an optional implementation, the electric drive assembly cooling and lubrication method in this embodiment includes:

[0060] When a proportional flow mode command is received, the opening degree of the second valve port of the electric three-way proportional valve 3 and the opening degree of the first valve port of the electric three-way proportional valve 3 are controlled based on the proportional data carried by the proportional flow mode command, so that the opening degree of the second valve port of the electric three-way proportional valve 3 and the opening degree of the first valve port of the electric three-way proportional valve 3 meet the preset conditions.

[0061] In this optional embodiment, based on the proportional data carried by the proportional flow mode command, the opening degree of the second valve port of the electric three-way proportional valve 3 and the opening degree of the first valve port of the electric three-way proportional valve 3 can be controlled so that the opening degree of the second valve port of the electric three-way proportional valve 3 and the opening degree of the first valve port of the electric three-way proportional valve 3 meet the preset conditions.

[0062] In addition, this application embodiment also provides an electric vehicle, which includes an electric drive assembly cooling and lubrication system as described in any of the foregoing embodiments.

[0063] Since the electric vehicle in this application embodiment includes the electric drive assembly cooling and lubrication system of this application, it has the advantages of simple structure and compact space. In the embodiments provided in this application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interface; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0064] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0065] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0066] It should be noted that, in order to implement the electric drive assembly cooling and lubrication method, the electric drive assembly cooling and lubrication system of this application embodiment further includes a controller, wherein the controller is electrically connected to the electric three-way proportional valve, and the controller is provided with a control module, which can execute the electric drive assembly cooling and lubrication method of this application embodiment based on a preset program.

[0067] It should be noted that if the function is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0069] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A cooling and lubrication system for an electric drive assembly, characterized in that, The electric drive assembly cooling and lubrication system includes: a first mechanical gear pump, a second mechanical gear pump, an electric three-way proportional valve, an oil reservoir, a heat exchanger, and a differential reduction gear; The first mechanical gear pump is installed at the end of the motor shaft of the electric drive assembly and is coaxial and concentric with the motor shaft of the electric drive assembly; The second mechanical gear pump is installed at the end of the differential reduction gear and is coaxial and concentric with the gear shaft of the differential reduction gear; The differential reduction gear is connected to the motor shaft of the electric drive assembly, and the differential reduction gear is used to make the gear speed inside the second mechanical gear pump different from the gear speed inside the first mechanical gear pump. The oil storage chamber is connected to the first valve port of the electric three-way proportional valve via an oil pipe. The first mechanical gear pump is connected to the second valve port of the electric three-way proportional valve. The second mechanical gear pump is connected to the third valve port of the electric three-way proportional valve. The first mechanical gear pump and the second mechanical gear pump are connected to the heat exchanger.

2. The electric drive assembly cooling and lubrication system as described in claim 1, characterized in that, The electric drive assembly cooling and lubrication system also includes an oil pipe injection device, which is connected to the heat exchanger. The oil pipe injection device is used to spray the lubricant in the oil pipe onto the gears, bearings, and drive motor of the electric drive assembly.

3. The electric drive assembly cooling and lubrication system as described in claim 2, characterized in that, The oil pipe injection device includes several injection ports, which are used to inject lubricating fluid from the oil pipe into the gears of the electric drive assembly, the bearings of the electric drive assembly, and the drive motor of the electric drive assembly.

4. The electric drive assembly cooling and lubrication system as described in claim 2, characterized in that, The electric drive assembly cooling and lubrication system also includes a filter, which is placed in the oil reservoir and connected to the oil pipe for filtering the lubricating fluid entering the oil pipe.

5. The electric drive assembly cooling and lubrication system as described in claim 1, characterized in that, The first mechanical gear pump is an eccentric internal meshing gear.

6. The electric drive assembly cooling and lubrication system as described in claim 1, characterized in that, The second mechanical gear pump is an eccentric internal meshing gear.

7. A method for cooling and lubricating an electric drive assembly, characterized in that, The electric drive assembly cooling and lubrication method is applied to the electric drive assembly cooling and lubrication system as described in any one of claims 1-6, wherein the electric drive assembly cooling and lubrication method comprises: When a low flow mode command is received, the second valve port of the electric three-way proportional valve is disconnected from the first valve port, and the third valve port of the electric three-way proportional valve is connected to the first valve port.

8. The electric drive assembly cooling and lubrication method as described in claim 7, characterized in that, The cooling and lubrication method for the electric drive assembly includes: When a high flow mode command is received, the second valve port of the electric three-way proportional valve is controlled to connect with the first valve port of the electric three-way proportional valve, and the third valve port of the electric three-way proportional valve is controlled to disconnect from the first valve port of the electric three-way proportional valve.

9. The cooling and lubrication method for an electric drive assembly as described in claim 7, characterized in that, The cooling and lubrication method for the electric drive assembly includes: When a proportional flow mode command is received, based on the proportional data carried by the proportional flow mode command, the opening degree of the second valve port of the electric three-way proportional valve and the opening degree of the first valve port of the electric three-way proportional valve are controlled so that the opening degree of the second valve port of the electric three-way proportional valve and the opening degree of the first valve port of the electric three-way proportional valve meet the preset conditions.

10. An electric vehicle, characterized in that, The electric vehicle includes the electric drive assembly cooling and lubrication system as described in any one of claims 1-6.

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