Two-gear electric driving system and vehicle

Abstract

The invention discloses a two-gear electric driving system and a vehicle, and relates to the technical field of electric driving systems.The two-gear electric driving system comprises a motor with a motor shaft, a main transmission module arranged on the motor shaft, a first output shaft, a second output shaft, a differential mechanism assembly, a first driven gear module and a second driven gear module, and one / two synchronizers. Wherein the electric driving system is formed by a first combination mode / a second combination mode; when the first combination mode is adopted, the synchronizers in the electric driving system are a first synchronizer A and a second synchronizer A; through the arrangement, the space limitation of a traditional coaxial structure on the radial size of the gear is thoroughly broken through, the low-gear gear and the high-gear gear can be independently and flexibly designed, a very large speed ratio span (the ratio of the low-gear speed ratio to the high-gear speed ratio) can be achieved, and therefore the power assembly requirement of a vehicle with the strong cross-country property is perfectly met.

Description

Technical Field

[0001] This invention relates to the field of electric drive system technology, specifically to a two-speed electric drive system and vehicle. Background Technology

[0002] As the core component of electric vehicles, the electric drive system directly affects the vehicle's power and economy. To balance the demand for high output torque during start-up and hill climbing with the demand for economy and high efficiency during high-speed cruising, the industry generally adopts a two-speed transmission scheme. Typically, the low-speed gear uses a larger gear ratio to provide strong torque output, while the high-speed gear uses a smaller gear ratio to achieve higher vehicle speeds and better energy efficiency. However, existing two-speed electric drive system technologies typically employ a coaxial design for the input and output gears of the low-speed and high-speed gears. While this coaxial layout is relatively simple in structure, it is limited by axial space constraints, making it difficult to increase the speed ratio span between the low-speed and high-speed gears (i.e., the ratio of the low-speed gear ratio to the high-speed gear ratio). This limited speed ratio span makes it difficult to meet the powertrain requirements of vehicles with strong off-road attributes. Summary of the Invention

[0003] Based on this, the purpose of the present invention is to provide a two-speed electric drive system and vehicle to solve the technical problem in the prior art where the input gears and output gears of the low-speed and high-speed gears in the existing two-speed electric drive systems are usually designed with a coaxial shaft, which results in a limited speed ratio span and makes it difficult to meet the powertrain requirements of vehicles with strong off-road attributes.

[0004] One aspect of the present invention is to provide a two-speed electric drive system, comprising: The motor has a motor shaft, a main drive module mounted on the motor shaft, a first output shaft and a second output shaft that are not coaxial with the motor shaft, a differential assembly, a first driven gear module, a second driven gear module, and one or two synchronizers; The electric drive system is formed by a first combination method / a second combination method; When the electric drive system is formed by the first combination, there are two synchronizers in the electric drive system, namely the first synchronizer A and the second synchronizer A. The first driven gear module and the second driven gear module are respectively loosely fitted on the first output shaft and the second output shaft, and both are engaged with the main drive module on the motor shaft; The first synchronizer A and the second synchronizer A are respectively disposed on the first output shaft and the second output shaft; Specifically, through the combination of the first driven gear module and the first synchronizer A, or the combination of the second driven gear module and the second synchronizer A, the power of the motor is selectively transmitted to the differential assembly via a first speed ratio path or a second speed ratio path.

[0005] Furthermore, when the electric drive system is formed by the first combination method; The first driven gear module includes a first driven gear A and a first driven gear ring disposed on the first output shaft, and the second driven gear module includes a second driven gear A and a second driven gear ring disposed on the second output shaft.

[0006] Furthermore, the main drive module is a driving gear A, which is constantly meshed with both the first driven gear A and the second driven gear A.

[0007] Furthermore, the main transmission module consists of two separate first drive gears B and second drive gears B. One of the first drive gears B and the second drive gear B is constantly meshed with the first driven gear A, and the other of the first drive gears B and the second drive gear B is constantly meshed with the second driven gear A.

[0008] Furthermore, when the electric drive system is formed by the second combination method, the synchronizer of the electric drive system is a synchronizer B; The synchronizer B is mounted on the motor shaft, and the main drive module includes a first main drive unit and a second main drive unit located on both sides of the synchronizer B. The first output shaft meshes with the first main drive unit via the first driven gear module; The second output shaft meshes with the second main drive unit via the second driven gear module; The synchronizer B is selectively coupled with the first main drive unit or the second main drive unit to transmit power to the differential assembly via the first speed ratio path or the second speed ratio path.

[0009] Furthermore, the first driven gear module is a first driven gear B.

[0010] Furthermore, the second driven gear module is a second driven gear B.

[0011] Furthermore, the first main transmission unit includes a first driving gear and a first driving gear ring, and the second main transmission unit includes a second driving gear and a second driving gear ring.

[0012] Furthermore, when the electric drive system is formed by either the first combination method or the second combination method; The first output shaft is provided with a first output shaft tooth, and the second output shaft is provided with a second output shaft tooth; The first output shaft teeth and the second output shaft teeth are both in constant mesh with the main reduction gear of the differential assembly.

[0013] Another aspect of the present invention is to provide a vehicle, including a vehicle body and the aforementioned two-speed electric drive system, the two-speed electric drive system being mounted on the vehicle body.

[0014] Compared with the prior art, the two-speed electric drive system shown in this invention has the following advantages: By setting the first and second output shafts to be non-axial with the motor shaft, the spatial limitations on the radial dimensions of gears imposed by traditional coaxial structures are completely broken. This allows for independent and flexible design of the low-speed and high-speed gears, enabling a very large speed ratio span (the ratio of the low-speed gear ratio to the high-speed gear ratio). This perfectly meets the powertrain requirements of vehicles with strong off-road capabilities. Furthermore, in this application, the electric drive system is formed by a first combination method / a second combination method. When the electric drive system is formed by the first combination method, there are two synchronizers in the electric drive system, namely the first synchronizer A and the second synchronizer A. The first driven gear module and the second driven gear module are respectively unloaded. On the first and second output shafts, both meshing with the main drive module on the motor shaft, a first synchronizer A and a second synchronizer A are respectively located on the first and second output shafts. Through the engagement of the first driven gear module and the first synchronizer A, or the engagement of the second driven gear module and the second synchronizer A, the power of the motor is selectively transmitted to the differential assembly through the first speed ratio path and the second speed ratio path. The design of the two synchronizers makes the engagement of the first driven gear module and the first synchronizer A, and the engagement of the second driven gear module and the second synchronizer A, independent actions. This design makes the power transmission path completely separated when shifting gears, which helps to improve the driving quality of the vehicle. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a two-speed electric drive system consisting of a first sub-mode in one embodiment of the present invention; Figure 2 This is a schematic diagram of the working path of the first speed ratio of the first sub-mode in an embodiment of the present invention; Figure 3 This is a schematic diagram of the second speed ratio working path of the first sub-mode in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a two-speed electric drive system composed of a second sub-mode in one embodiment of the present invention; Figure 5This is a schematic diagram of the first speed ratio working path of the second sub-mode in one embodiment of the present invention; Figure 6 This is a schematic diagram of the second speed ratio working path of the second sub-mode in one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a two-speed electric drive system configured by the second combination method in one embodiment of the present invention; Figure 8 This is a schematic diagram of the working path of the first speed ratio in a second combination method according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the working path of the second speed ratio in a second combination method according to an embodiment of the present invention.

[0016] Figure label: 100. Motor; 110. Motor shaft; 200. Main drive module; 210. Drive gear A; 220. First drive gear B; 230. Second drive gear B; 240. First main drive unit; 241. First drive gear; 242. First drive gear ring; 250. Second main drive unit; 251. Second drive gear; 252. Second drive gear ring; 300, First output shaft; 310, First output shaft tooth; 400, Second output shaft; 410, Second output shaft tooth; 500. Differential assembly; 510. Main reduction gear; 600. First driven gear module; 610. First driven gear A; 620. First driven gear ring; 630. First driven gear B; 700. Second driven gear module; 710. Second driven gear A; 720. Second driven gear ring; 730. Second driven gear B; 800. First synchronizer A; 810. Second synchronizer A; 900, Synchronizer B. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0018] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] First Embodiment Please see Figures 1 to 9 The image shows a two-speed electric drive system in the first embodiment of the present invention, comprising: a motor 100 having a motor shaft 110, a main drive module 200 disposed on the motor shaft 110, a first output shaft 300 and a second output shaft 400 that are not coaxial with the motor shaft 110, a differential assembly 500, a first driven gear module 600, a second driven gear module 700, and one or two synchronizers.

[0021] It should be noted that the motor 100, main drive module 200, first output shaft 300, second output shaft 400, differential assembly 500, first driven gear module 600, second driven gear module 700, and one or two synchronizers are not intended to limit the electric drive system. It may also include other components that constitute the electric drive system. Since other components are conventional prior art in this field, they will not be specifically described here.

[0022] In this embodiment, the electric drive system is formed by a first combination method / a second combination method; When the electric drive system is formed by the first combination method, there are two synchronizers in the electric drive system, namely the first synchronizer A800 and the second synchronizer A810. The first driven gear module 600 and the second driven gear module 700 are respectively loosely fitted on the first output shaft 300 and the second output shaft 400, and both are engaged with the main drive module 200 on the motor shaft 110. The first synchronizer A800 and the second synchronizer A810 are respectively disposed on the first output shaft 300 and the second output shaft 400; The combination of the first driven gear module 600 and the first synchronizer A800, and the combination of the second driven gear module 700 and the second synchronizer A810, selectively transmits the power of the motor 100 to the differential assembly 500 through the first speed ratio path and the second speed ratio path.

[0023] Additionally, it should be noted that when the electric drive system is formed by either the first combination method or the second combination method; The first output shaft 300 is provided with a first output shaft tooth 310, and the second output shaft 400 is provided with a second output shaft tooth 410. The first output shaft tooth 310 and the second output shaft tooth 410 are both in constant mesh with the main reduction gear 510 of the differential assembly 500.

[0024] In other words, in this embodiment, by setting the first output shaft 300 and the second output shaft 400 to be non-axial with the motor shaft 110, the spatial limitation on the radial dimension of the gears imposed by the traditional coaxial structure is completely broken. This allows the low-speed and high-speed gears to be designed independently and flexibly, enabling a very large speed ratio span (the ratio of the low-speed gear ratio to the high-speed gear ratio). This perfectly meets the powertrain requirements of vehicles with strong off-road attributes. Furthermore, in this embodiment, the electric drive system is formed by a first combination method / a second combination method. When the electric drive system is formed by the first combination method, there are two synchronizers in the electric drive system, namely the first synchronizer A800 and the second synchronizer A810. The first driven gear module 600 and the second driven gear module 700 are respectively loosely fitted on the first output shaft 300 and the motor shaft 110. The first output shaft 300 and the second output shaft 400 are connected to the main drive module 200 on the motor shaft 110. The first synchronizer A800 and the second synchronizer A810 are respectively located on the first output shaft 300 and the second output shaft 400. The power of the motor 100 is selectively transmitted to the differential assembly 500 through the first speed ratio path and the second speed ratio path by the engagement of the first driven gear module 600 and the first synchronizer A800 and the engagement of the second driven gear module 700 and the second synchronizer A810. The design of the two synchronizers makes the engagement of the first driven gear module 600 and the first synchronizer A800 and the engagement of the second driven gear module 700 and the second synchronizer A810 independent actions. This design makes the power transmission path completely separated when the gear is shifted, which helps to improve the driving quality of the vehicle.

[0025] Specifically, in this example, when the electric drive system is formed by the first combination method; The first driven gear module 600 includes a first driven gear A610 and a first driven gear ring 620 disposed on the first output shaft 300, and the second driven gear module 700 includes a second driven gear A710 and a second driven gear ring 720 disposed on the second output shaft 400.

[0026] In some preferred embodiments, the first combination method may further include two sub-modes, namely the first sub-mode and the second sub-mode of the first combination method.

[0027] Please refer to the details. Figure 1 As shown, the main drive module 200 in the first sub-mode is a drive gear A210. The drive gear A210 is constantly meshed with the first driven gear A610 and the second driven gear A710. In other words, the two gears share the same drive gear A210, which can effectively reduce the overall length and make the overall structure of the electric drive system more compact and easier to arrange and install.

[0028] Please see Figure 2 and Figure 3 The diagram shows the working path diagrams for the first and second speed ratios of the first sub-mode.

[0029] Specifically, in the first speed ratio working path, the first synchronizer A800 engages the first driven gear ring 620, and the power path is: motor 100 → motor shaft 110 → main drive module 200 (drive gear A210) → first driven gear A610 → first driven gear ring 620 → first synchronizer A800 → first output shaft 300 → first output shaft gear 310 → main reduction gear 510 → differential assembly 500.

[0030] In the second speed ratio working path, the second synchronizer A810 engages the second driven gear ring 720, and the power path is: motor 100 → motor shaft 110 → main drive module 200 (drive gear A210) → second driven gear A710 → second driven gear ring 720 → second synchronizer A810 → second output shaft 400 → second output shaft gear 410 → main reduction gear 510 → differential assembly 500.

[0031] Please refer to the details. Figure 4 As shown, the main drive module 200 in the second sub-mode consists of two separate first drive gears B220 and second drive gears B230. One of the first drive gears B220 and B230, a first driven gear A610, is constantly meshed with it, while the other of the first drive gears B220 and B230 is constantly meshed with the second driven gear A710. In other words, the first drive gears B220 and B230 of the two gears are independent of each other and do not share teeth, which is beneficial for design requirements with a larger speed ratio span.

[0032] Please see Figure 5 and Figure 6 The diagram shows the working path diagrams for the first and second speed ratios of the second sub-mode.

[0033] Specifically, in the first speed ratio working path, the first synchronizer A800 engages the first driven gear ring 620, and the power path is: motor 100 → motor shaft 110 → main drive module 200 (first driving gear B220) → first driven gear A610 → first driven gear ring 620 → first synchronizer A800 → first output shaft 300 → first output shaft gear 310 → main reduction gear 510 → differential assembly 500.

[0034] In the second speed ratio working path, the second synchronizer A810 engages the second driven gear ring 720, and the power path is: motor 100 → motor shaft 110 → main drive module 200 (second driving gear B230) → second driven gear A710 → second driven gear ring 720 → second synchronizer A810 → second output shaft 400 → second output shaft gear 410 → main reduction gear 510 → differential assembly 500.

[0035] Additionally, when the electric drive system is configured using the second combination method, the synchronizer of the electric drive system is a synchronizer B900. Please refer to [link / reference needed] for details. Figure 7 As shown; Synchronizer B900 is mounted on motor shaft 110, and main drive module 200 includes a first main drive unit 240 and a second main drive unit 250 mounted on both sides of synchronizer B900. The first output shaft 300 meshes with the first main drive unit 240 via the first driven gear module 600; The second output shaft 400 meshes with the second main drive unit 250 via the second driven gear module 700; The synchronizer is selectively engaged with the first main drive unit 240 or the second main drive unit 250 to transmit power to the differential assembly 500 via the first speed ratio path or the second speed ratio path.

[0036] In the second combination, the first driven gear module 600 is a first driven gear B630.

[0037] In the second combination, the second driven gear module 700 is a second driven gear B730.

[0038] In the second combination, the first main drive unit 240 includes a first drive gear 241 and a first drive gear ring 242, and the second main drive unit 250 includes a second drive gear 251 and a second drive gear ring 252.

[0039] Please see Figure 8 and Figure 9 The diagram shows the working path diagrams for the first and second speed ratios in the second combination mode.

[0040] Specifically, in the first speed ratio working path, synchronizer B900 engages the first driving gear ring 242, and the power path is: motor 100 → motor shaft 110 → synchronizer B900 → first driving gear ring 242 → first main transmission unit 240 (first driving gear 241) → first driven gear module 600 (first driven gear B630) → first output shaft 300 → first output shaft gear 310 → main reduction gear 510 → differential assembly 500.

[0041] In the second speed ratio working path, synchronizer B900 engages the second driving gear ring 252, and the power path is: motor 100 → motor shaft 110 → synchronizer B900 → second main drive unit 250 (second driving gear ring 252) → second main drive unit 250 (second driving gear 251) → second driven gear module 700 (second driven gear B730) → second output shaft 400 → second output shaft gear 410 → main reduction gear 510 → differential assembly 500.

[0042] In summary, the two-speed electric drive system in the first embodiment of the present invention has at least the following advantages compared with the two-speed electric drive system in the prior art: By configuring the first output shaft 300 and the second output shaft 400 of this application to be non-axial with the motor shaft 110, the spatial limitation on the radial dimension of gears imposed by the traditional coaxial structure is completely broken. This allows the low-speed and high-speed gears to be designed independently and flexibly, enabling a very large speed ratio span (the ratio of the low-speed gear ratio to the high-speed gear ratio). This perfectly meets the powertrain requirements of vehicles with strong off-road attributes. Furthermore, in this embodiment, the electric drive system is formed by a first combination method / a second combination method. When the electric drive system is formed by the first combination method, there are two synchronizers in the electric drive system. The first driven gear module 600 and the second driven gear module 700 are respectively loosely fitted on the first output shaft 300 and the second output shaft 400. On the output shaft 400, both are engaged with the main drive module 200 on the motor shaft 110. Two synchronizers are respectively located on the first output shaft 300 and the second output shaft 400. Through the engagement of one synchronizer corresponding to the first driven gear module 600 and the engagement of the other synchronizer corresponding to the second driven gear module 700, the power of the motor 100 is selectively transmitted to the differential assembly 500 through the first speed ratio path and the second speed ratio path. The design of the two synchronizers makes the engagement of one synchronizer with the first driven gear module 600 and the engagement of the other synchronizer with the second driven gear module 700 independent actions. This design makes the power transmission path completely separated when shifting gears, which helps to improve the driving quality of the vehicle.

[0043] Second Embodiment The second embodiment of the present invention provides a vehicle, including a vehicle body and a two-speed electric drive system as described in the first embodiment above. The two-speed electric drive system is used to be mounted on the vehicle body.

[0044] By assembling the two-speed electric drive system shown in the first embodiment into the vehicle body, a very large speed ratio span (the ratio of the low-speed gear ratio to the high-speed gear ratio) can be achieved, thus perfectly meeting the powertrain requirements of vehicles with strong off-road attributes.

[0045] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A two-speed electric drive system, characterized in that, include: The motor has a motor shaft, a main drive module mounted on the motor shaft, a first output shaft and a second output shaft that are not coaxial with the motor shaft, a differential assembly, a first driven gear module, a second driven gear module, and one or two synchronizers; The electric drive system is formed by a first combination method / a second combination method; When the electric drive system is formed by the first combination, there are two synchronizers in the electric drive system, namely the first synchronizer A and the second synchronizer A. The first driven gear module and the second driven gear module are respectively loosely fitted on the first output shaft and the second output shaft, and both are engaged with the main drive module on the motor shaft; The first synchronizer A and the second synchronizer A are respectively disposed on the first output shaft and the second output shaft; Specifically, through the combination of the first driven gear module and the first synchronizer A, or the combination of the second driven gear module and the second synchronizer A, the power of the motor is selectively transmitted to the differential assembly via a first speed ratio path or a second speed ratio path.

2. The two-speed electric drive system according to claim 1, characterized in that: When the electric drive system is formed by the first combination method; The first driven gear module includes a first driven gear A and a first driven gear ring disposed on the first output shaft, and the second driven gear module includes a second driven gear A and a second driven gear ring disposed on the second output shaft.

3. The two-speed electric drive system according to claim 2, characterized in that: The main drive module is a driving gear A, which is constantly meshed with both the first driven gear A and the second driven gear A.

4. The two-speed electric drive system according to claim 2, characterized in that: The main drive module consists of two separate first drive gears B and second drive gears B. One of the first drive gears B and the second drive gear B is constantly meshed with the first driven gear A, and the other of the first drive gears B and the second drive gear B is constantly meshed with the second driven gear A.

5. The two-speed electric drive system according to claim 1, characterized in that: When the electric drive system is formed by the second combination method, the synchronizer of the electric drive system is a synchronizer B; The synchronizer B is mounted on the motor shaft, and the main drive module includes a first main drive unit and a second main drive unit located on both sides of the synchronizer B. The first output shaft meshes with the first main drive unit via the first driven gear module; The second output shaft meshes with the second main drive unit via the second driven gear module; The synchronizer B is selectively coupled with the first main drive unit or the second main drive unit to transmit power to the differential assembly via the first speed ratio path or the second speed ratio path.

6. The two-speed electric drive system according to claim 5, characterized in that: The first driven gear module is a first driven gear B.

7. The two-speed electric drive system according to claim 5, characterized in that: The second driven gear module is a second driven gear B.

8. The two-speed electric drive system according to claim 5, characterized in that: The first main transmission unit includes a first driving gear and a first driving gear ring, and the second main transmission unit includes a second driving gear and a second driving gear ring.

9. The two-speed electric drive system according to claim 1, characterized in that: When the electric drive system is formed by either the first combination method or the second combination method; The first output shaft is provided with a first output shaft tooth, and the second output shaft is provided with a second output shaft tooth; The first output shaft teeth and the second output shaft teeth are both in constant mesh with the main reduction gear of the differential assembly.

10. A vehicle, characterized in that: The vehicle includes a vehicle body and a two-speed electric drive system as described in any one of claims 1-9, wherein the two-speed electric drive system is used to be mounted on the vehicle body.

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