A two-gear coaxial transmission, electric drive system and automobile

Abstract

The application relates to a two-gear coaxial transmission, an electric drive system and a car, which comprises a gear shifting engagement sleeve, a first-gear engagement sleeve, a second-gear engagement sleeve, a first-stage embedded planetary gear and a second-stage embedded planetary gear, the first-stage embedded planetary gear comprises a first-stage inner planetary row and a first-stage outer planetary row, and the second-stage embedded planetary gear comprises a second-stage inner planetary row and a second-stage outer planetary row; a first-stage inner planet carrier of the first-stage inner planetary row is connected with a second-stage inner sun gear of the second-stage inner planetary row, and a first-stage outer planet carrier of the first-stage outer planetary row and a second-stage outer planet carrier of the second-stage outer planetary row are fixedly arranged; the first-gear engagement sleeve is fixedly connected with the first-stage inner planet carrier, and the second-gear engagement sleeve is fixedly connected with the first-stage outer planet carrier; the gear shifting engagement sleeve can be slid to engage with the first-gear engagement sleeve or the second-gear engagement sleeve. The application has the beneficial effects of compact structure, reasonable design, providing a coaxial 2-speed electric drive axle without traditional differential gears, and high-low gear switching through the first-stage inner and outer planetary row embedding.

Description

Technical Field

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

[0002] The rapid development of the automotive industry and the increasing demand for automobiles have led to a continuous rise in automobile production and ownership, which has exacerbated the energy and environmental issues that people are currently concerned about. As a result, electric vehicles have emerged.

[0003] Electric vehicles are vehicles that use onboard power sources to drive their wheels with electric motors and meet all road traffic and safety regulations. Because they have a relatively smaller environmental impact compared to traditional vehicles, their future prospects are widely viewed favorably.

[0004] Currently, electric vehicles in existing technology use differential gears for speed reduction. This structure occupies a large space and is costly; in addition, switching between high and low gears is inconvenient. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing a two-speed coaxial transmission, an electric drive system, and an automobile.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A two-speed coaxial transmission includes: a shift sleeve, a first-speed sleeve, a second-speed sleeve, a first-stage embedded planetary gear, and a second-stage embedded planetary gear. The first-stage embedded planetary gear includes a first-stage inner planetary gear set and a first-stage outer planetary gear set, with the inner planetary gear set coaxially embedded within the outer planetary gear set. The second-stage embedded planetary gear also includes a second-stage inner planetary gear set and a second-stage outer planetary gear set, with the inner planetary gear set coaxially embedded within the outer planetary gear set. The inner planetary gear set and the inner planetary gear set are coaxially distributed, and the outer planetary gear set and the outer planetary gear set are coaxially distributed. The first-stage inner planetary carrier of the first-stage inner planetary gear set is connected to the second-stage inner sun gear of the second-stage inner planetary gear set. The first-stage outer planetary carrier of the first-stage outer planetary gear set and the second-stage outer planetary carrier of the second-stage outer planetary gear set are respectively fixedly installed. The first gear engagement sleeve is fixedly connected to the first-stage inner planetary carrier, and the second gear engagement sleeve is fixedly connected to the first-stage outer planetary carrier. The shift engagement sleeve is installed between the first gear engagement sleeve and the second gear engagement sleeve, and it can slide to engage with either the first gear engagement sleeve or the second gear engagement sleeve.

[0007] The beneficial effects of this invention are as follows: During operation, the gear shifting sleeve is slid in a manner conceived by those skilled in the art, and the specific gear shifting is as follows: (1) First gear mode: When the shift sleeve is engaged with the first gear sleeve, one power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then output from the left half shaft; the other power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then from the second-stage inner planetary gear set to the second-stage outer planetary gear set, and then output from the right half shaft. (2) Second gear mode: When the shift sleeve engages with the second gear sleeve, the power is transmitted from the first-stage inner planetary gear set to the second-stage inner sun gear of the second-stage inner planetary gear set, and then output from the left half shaft; the other power is transmitted to the second-stage outer ring gear of the second-stage outer planetary gear set, and then output from the right half shaft. (3) Neutral mode: When the shift sleeve is between the first gear sleeve and the second gear sleeve, the first-stage planetary gear set rotates in idling and there is no power output.

[0008] This invention features a compact structure and reasonable design, providing a coaxial 2-speed electric drive axle without traditional differential gears; the first stage features nested inner and outer planetary gear sets, allowing for high and low gear switching.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the primary planetary gear set also includes a primary sun gear, a primary ring gear, and multiple primary planetary gears. The primary sun gear can rotate around its own axis, and the primary ring gear is coaxially sleeved outside the primary sun gear. The primary planetary carrier is distributed between the primary sun gear and the primary ring gear. The multiple primary planetary gears are evenly spaced along the circumference of the primary sun gear on the primary planetary carrier and mesh with the primary ring gear and the primary sun gear, respectively. The multiple primary planetary gears can each rotate around their own axis and can each revolve around the primary sun gear.

[0011] The advantages of adopting the above-mentioned further scheme are that the structure is simple and the design is reasonable. During operation, the power is transmitted to the first-stage inner sun gear. The rotation of the first-stage inner sun gear drives the rotation of multiple first-stage inner planet gears. The multiple first-stage inner planet gears revolve around the first-stage inner sun gear to drive the rotation of the first-stage inner ring gear, so as to transmit the power to the first-stage outer planet gear set and realize the rapid transmission of power.

[0012] Furthermore, the secondary internal planetary gear set also includes a secondary internal gear ring, a secondary internal planet carrier, and multiple secondary internal planetary gears. The secondary internal sun gear is coaxially distributed on one side of the primary internal sun gear and can rotate around its own axis. The secondary internal gear ring is coaxially sleeved outside the secondary internal sun gear and can rotate around its own axis. The secondary internal planet carrier is distributed between the secondary internal gear ring and the secondary internal sun gear. The multiple secondary internal planetary gears are evenly spaced along the circumference of the secondary internal sun gear on the secondary internal planet carrier and mesh with the secondary internal gear ring and the secondary internal sun gear, respectively. The multiple secondary internal planetary gears can each rotate around their own axis and can each revolve around the secondary internal sun gear.

[0013] The advantages of adopting the above-mentioned further scheme are that the structure is simple and the design is reasonable. During operation, the power is transmitted to the second-stage inner sun gear. The rotation of the second-stage inner sun gear drives the rotation of multiple second-stage inner planet gears. The multiple second-stage inner planet gears revolve around the second-stage inner sun gear to drive the rotation of the second-stage inner ring gear, so as to transmit the power to the second-stage outer planet gear set and realize the rapid transmission of power.

[0014] Furthermore, the secondary outer planetary gear set also includes a secondary outer sun gear, a secondary outer ring gear, and multiple secondary outer planet gears. The secondary outer sun gear is coaxially fixedly sleeved outside the secondary inner ring gear and can rotate together with the secondary inner ring gear. The secondary outer ring gear is coaxially sleeved outside the secondary outer sun gear. The secondary outer planet carrier is distributed between the secondary outer sun gear and the secondary outer ring gear. The multiple secondary outer planet gears are evenly spaced along the circumference of the secondary outer sun gear on the secondary outer planet carrier and mesh with the secondary outer ring gear and the secondary outer sun gear, respectively. The multiple secondary outer planet gears can rotate around their own axes and can revolve around the secondary outer sun gear.

[0015] The advantages of adopting the above-mentioned further scheme are that the structure is simple and the design is reasonable. During operation, the power is transmitted to the second-stage outer sun gear. The rotation of the second-stage outer sun gear drives the rotation of multiple second-stage outer planet gears. The multiple second-stage outer planet gears revolve around the second-stage outer sun gear to drive the rotation of the second-stage outer ring gear, so as to transmit the power to the second-stage outer planet gear set and realize the rapid transmission of power.

[0016] Furthermore, the first-stage outer planetary gear set also includes a first-stage outer sun gear, a first-stage outer ring gear, and multiple first-stage outer planet gears. The first-stage outer sun gear is coaxially fixedly sleeved outside the first-stage inner ring gear and can rotate together with the first-stage inner ring gear. The first-stage outer ring gear is coaxially sleeved outside the first-stage outer sun gear. The first-stage outer planet carrier is distributed between the first-stage outer sun gear and the first-stage outer ring gear. The multiple first-stage outer planet gears are evenly spaced along the circumference of the first-stage outer sun gear on the first-stage outer planet carrier and mesh with the first-stage outer ring gear and the first-stage outer sun gear, respectively. The multiple first-stage outer planet gears can each rotate around their own axis and can each revolve around the first-stage outer sun gear.

[0017] The advantages of adopting the above-mentioned further scheme are that the structure is simple and the design is reasonable. During operation, the power is transmitted to the first-stage outer sun gear. The rotation of the first-stage outer sun gear drives the rotation of multiple first-stage outer planet gears. The multiple first-stage outer planet gears revolve around the first-stage outer sun gear to drive the rotation of the first-stage outer ring gear, so as to transmit the power to the first-stage outer planet gear set and realize the rapid transmission of power.

[0018] Furthermore, the primary external gear ring can rotate around its own axis, and the shift engagement sleeve is connected to the primary external gear ring, which can slide back and forth along the axis of the primary external gear ring.

[0019] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The shift engagement sleeve is connected to the first-stage external gear ring, which is convenient for assembly. In addition, the shift engagement sleeve can slide back and forth along the axial direction of the first-stage external gear ring to engage with the first-gear engagement sleeve or the second-gear engagement sleeve, so as to realize quick shifting and convenient switching.

[0020] Furthermore, it also includes a shift motor, which is fixedly mounted on one side of the shift engagement sleeve and is used to drive the shift engagement sleeve to slide back and forth.

[0021] The beneficial effect of adopting the above-mentioned further solution is that during operation, the shift motor starts to drive the shift engagement sleeve to slide along the axial direction of the first-stage external gear ring, thereby enabling the shift engagement sleeve to engage with the first-stage engagement sleeve or the second-stage engagement sleeve, achieving rapid shifting and convenient switching.

[0022] The present invention also relates to an electric drive system, including a left half-shaft, a right half-shaft, and a two-speed coaxial transmission as described above, wherein the left half-shaft and the right half-shaft are coaxially distributed, and the first-stage inner planetary gear set and the second-stage inner planetary gear set are coaxially sleeved outside the left half-shaft; the input end of the left half-shaft is fixedly connected to the second-stage inner planetary carrier, and the input end of the right half-shaft is fixedly connected to the second-stage outer planetary carrier.

[0023] The beneficial effect of adopting the above-mentioned further solution is that during the working process, the gear shifting sleeve can be slid in a manner conceived by those skilled in the art, and the specific gear shifting situation is as follows: (1) First gear mode: When the shift sleeve is engaged with the first gear sleeve, one power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then output from the left half shaft; the other power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then from the second-stage inner planetary gear set to the second-stage outer planetary gear set, and then output from the right half shaft. (2) Second gear mode: When the shift sleeve engages with the second gear sleeve, the power is transmitted from the first-stage inner planetary gear set to the second-stage inner sun gear of the second-stage inner planetary gear set, and then output from the left half shaft; the other power is transmitted to the second-stage outer ring gear of the second-stage outer planetary gear set, and then output from the right half shaft. (3) Neutral mode: When the shift sleeve is between the first gear sleeve and the second gear sleeve, the first-stage planetary gear set rotates in idle mode and there is no power output; In addition, the present invention also provides an electric drive system with a compact structure and reasonable design, providing a coaxial 2-speed electric drive axle without traditional differential gears; the first stage inner and outer planetary gear sets are nested, allowing for high and low gear switching.

[0024] Furthermore, it also includes a hollow shaft motor, which is coaxially sleeved outside the left half-shaft, and its drive end is fixedly connected to the first-stage inner sun gear.

[0025] The advantages of adopting the above-mentioned further solution are that the structure is simple, the design is reasonable, and the hollow shaft motor provides power to the entire drive system during operation, making the drive convenient. In addition, the hollow shaft motor adopts a hollow shaft structure, which not only facilitates the connection between the drive end of the hollow shaft motor and the first-stage inner sun gear, but also does not affect the assembly of the left half shaft, making assembly convenient and saving space.

[0026] The present invention also relates to an automobile including the electric drive system described above.

[0027] The beneficial effect of adopting the above-mentioned further solutions is that the present invention also provides an automobile with a compact structure and reasonable design, which provides a coaxial 2-speed electric drive axle and has no traditional differential gear; the first stage inner and outer planetary gear sets are nested, and high and low gears can be switched. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the first gear position in this invention; Figure 3 This is a schematic diagram of the two-speed gear configuration in this invention; Figure 4 This is a schematic diagram of the neutral gear position in this invention.

[0029] The attached diagram lists the components represented by each number as follows: 1. Gear shifting sleeve; 2. First gear gearing sleeve; 3. Second gear gearing sleeve; 4. First-stage internal planetary carrier; 5. Second-stage internal sun gear; 6. First-stage external planetary carrier; 7. Second-stage external planetary carrier; 8. First-stage internal sun gear; 9. First-stage internal gear ring; 10. First-stage internal planetary gears; 11. Second-stage internal gear ring; 12. Second-stage internal planetary carrier; 13. Second-stage internal planetary gears; 14. Second-stage external sun gear; 15. Second-stage external gear ring; 16. Second-stage external planetary gears; 17. First-stage external sun gear; 18. First-stage external gear ring; 19. First-stage external planetary gears; 20. Gear shifting motor; 21. Left half-shaft; 22. Right half-shaft; 23. Hollow shaft motor. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0033] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" other elements or features would be oriented "over" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0034] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0035] Example 1 like Figures 1 to 4 As shown, this embodiment provides a two-speed coaxial transmission, including: a shift engagement sleeve 1, a first-speed engagement sleeve 2, a second-speed engagement sleeve 3, a first-stage embedded planetary gear, and a second-stage embedded planetary gear. The first-stage embedded planetary gear includes a first-stage inner planetary gear set and a first-stage outer planetary gear set, with the first-stage inner planetary gear set coaxially embedded within the first-stage outer planetary gear set. The second-stage embedded planetary gear includes a second-stage inner planetary gear set and a second-stage outer planetary gear set, with the second-stage inner planetary gear set coaxially embedded within the second-stage outer planetary gear set. The second-stage inner planetary gear set and the first-stage inner planetary gear set are coaxially distributed, and the second-stage outer planetary gear set and the first-stage outer planetary gear set are coaxially distributed. The first-stage inner planet carrier 4 of the first-stage inner planetary gear set is connected to the second-stage inner sun gear 5 of the second-stage inner planetary gear set. The first-stage outer planet carrier 6 of the first-stage outer planetary gear set and the second-stage outer planet carrier 7 of the second-stage outer planetary gear set are respectively fixedly installed. The first gear engagement sleeve 2 is fixedly connected to the first-stage inner planet carrier 4, and the second gear engagement sleeve 3 is fixedly connected to the first-stage outer planet carrier 6. The shift engagement sleeve 1 is installed between the first gear engagement sleeve 2 and the second gear engagement sleeve 3, and it can slide to engage with the first gear engagement sleeve 2 or the second gear engagement sleeve 3.

[0036] During operation, the gear shifting sleeve 1 is slid in a manner conceived by those skilled in the art, and the specific gear shifting is as follows: (1) First gear mode: When the shift sleeve 1 and the first gear sleeve 2 are engaged, one power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then output by the left half shaft 21; the other power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then from the second-stage inner planetary gear set to the second-stage outer planetary gear set, and then output by the right half shaft 22. (2) Second gear mode: When the shift sleeve 1 and the second gear sleeve 3 are engaged, the power is transmitted from the first-stage inner planetary gear set to the second-stage inner sun gear of the second-stage inner planetary gear set, and then output by the left half shaft 21; the other power is transmitted to the second-stage outer ring gear of the second-stage outer planetary gear set, and then output by the right half shaft 22. (3) Neutral mode: When the shift sleeve 1 is between the first gear shift sleeve 2 and the second gear shift sleeve 3, the first-stage planetary gear set rotates in idling and there is no power output.

[0037] This embodiment has a compact structure and reasonable design, providing a coaxial 2-speed electric drive axle without traditional differential gears; the first stage features nested inner and outer planetary gear sets, allowing for high and low gear switching.

[0038] Example 2 Based on Embodiment 1, in this embodiment, the first-stage internal planetary gear set further includes a first-stage internal sun gear 8, a first-stage internal gear ring 9, and multiple first-stage internal planetary gears 10. The first-stage internal sun gear 8 can rotate around its own axis, and the first-stage internal gear ring 9 is coaxially sleeved outside the first-stage internal sun gear 8. The first-stage internal planetary carrier 4 is distributed between the first-stage internal sun gear 8 and the first-stage internal gear ring 9. The multiple first-stage internal planetary gears 10 are evenly spaced along the circumference of the first-stage internal sun gear 8 on the first-stage internal planetary carrier 4, and respectively mesh with the first-stage internal gear ring 9 and the first-stage internal sun gear 8. The multiple first-stage internal planetary gears 10 can each rotate around their own axis and can each revolve around the first-stage internal sun gear 8.

[0039] The scheme has a simple structure and reasonable design. During operation, the power is transmitted to the first-stage inner sun gear 8. The rotation of the first-stage inner sun gear 8 drives the rotation of multiple first-stage inner planet gears 10. The multiple first-stage inner planet gears 10 revolve around the first-stage inner sun gear 8, thereby driving the rotation of the first-stage inner gear ring 9, so as to transmit the power to the first-stage outer planet gear set and realize the rapid transmission of power.

[0040] Example 3 Based on Embodiment 2, in this embodiment, the secondary internal planetary gear set further includes a secondary internal gear ring 11, a secondary internal planet carrier 12, and multiple secondary internal planetary gears 13. The secondary internal sun gear 5 is coaxially distributed on one side of the primary internal sun gear 8 and can rotate around its own axis. The secondary internal gear ring 11 is coaxially sleeved outside the secondary internal sun gear 5 and can rotate around its own axis. The secondary internal planet carrier 12 is distributed between the secondary internal gear ring 11 and the secondary internal sun gear 5. The multiple secondary internal planetary gears 13 are evenly spaced along the circumference of the secondary internal sun gear 5 on the secondary internal planet carrier 12 and mesh with the secondary internal gear ring 11 and the secondary internal sun gear 5 respectively. The multiple secondary internal planetary gears 13 can rotate around their own axes and can revolve around the secondary internal sun gear 5 respectively.

[0041] The scheme has a simple structure and reasonable design. During operation, the power is transmitted to the secondary inner sun gear 5. The rotation of the secondary inner sun gear 5 drives the rotation of multiple secondary inner planet gears 13. The multiple secondary inner planet gears 13 revolve around the secondary inner sun gear 5 to drive the rotation of the secondary inner gear ring 11, so as to transmit the power to the secondary outer planet gear set and realize the rapid transmission of power.

[0042] Example 4 Based on Embodiment 3, in this embodiment, the secondary outer planetary gear set further includes a secondary outer sun gear 14, a secondary outer gear ring 15, and multiple secondary outer planet gears 16. The secondary outer sun gear 14 is coaxially fixedly sleeved on the secondary inner gear ring 11 and can rotate together with the secondary inner gear ring 11. The secondary outer gear ring 15 is coaxially sleeved on the secondary outer sun gear 14. The secondary outer planet carrier 7 is distributed between the secondary outer sun gear 14 and the secondary outer gear ring 15. The multiple secondary outer planet gears 16 are evenly spaced along the circumference of the secondary outer sun gear 14 on the secondary outer planet carrier 7 and mesh with the secondary outer gear ring 15 and the secondary outer sun gear 14 respectively. The multiple secondary outer planet gears 16 can rotate around their own axes and can revolve around the secondary outer sun gear 14 respectively.

[0043] The scheme has a simple structure and reasonable design. During operation, the power is transmitted to the secondary outer sun gear 14. The rotation of the secondary outer sun gear 14 drives the rotation of multiple secondary outer planet gears 16. The multiple secondary outer planet gears 16 revolve around the secondary outer sun gear 14 to drive the rotation of the secondary outer ring gear 15, so as to transmit the power to the secondary outer planet gear set and realize the rapid transmission of power.

[0044] Example 5 Based on any one of Embodiments 2 to 4, in this embodiment, the first-stage outer planetary gear set further includes a first-stage outer sun gear 17, a first-stage outer gear ring 18, and a plurality of first-stage outer planet gears 19. The first-stage outer sun gear 17 is coaxially fixedly sleeved on the first-stage inner gear ring 9 and can rotate together with the first-stage inner gear ring 9. The first-stage outer gear ring 18 is coaxially sleeved on the first-stage outer sun gear 17. The first-stage outer planet carrier 6 is distributed between the first-stage outer sun gear 17 and the first-stage outer gear ring 18. The plurality of first-stage outer planet gears 19 are evenly spaced along the circumference of the first-stage outer sun gear 17 on the first-stage outer planet carrier 6 and respectively mesh with the first-stage outer gear ring 18 and the first-stage outer sun gear 17. The plurality of first-stage outer planet gears 19 can each rotate around their own axis and can each revolve around the first-stage outer sun gear 17.

[0045] The scheme has a simple structure and reasonable design. During operation, the power is transmitted to the first-stage outer sun gear 17. The rotation of the first-stage outer sun gear 17 drives the rotation of multiple first-stage outer planet gears 19. The multiple first-stage outer planet gears 19 revolve around the first-stage outer sun gear 17, thereby driving the rotation of the first-stage outer ring gear 18 to transmit the power to the first-stage outer planet gear set, thus achieving rapid power transmission.

[0046] Example 6 Based on embodiment 5, in this embodiment, the first-stage external gear ring 18 can rotate around its own axis, and the shift engagement sleeve 1 is connected to the first-stage external gear ring 18, which can slide back and forth along the axis of the first-stage external gear ring 18.

[0047] The scheme has a simple structure and reasonable design. The shift engagement sleeve 1 is connected to the first-stage external gear ring 18, which is easy to assemble. In addition, the shift engagement sleeve 1 can slide back and forth along the axial direction of the first-stage external gear ring 18 to engage with the first gear engagement sleeve 2 or the second gear engagement sleeve 3, so as to realize quick gear shifting and convenient switching.

[0048] Example 7 Based on any one of Embodiments 5 to 6, this embodiment further includes a shift motor 20, which is fixedly disposed on one side of the shift engagement sleeve 1 and is used to drive the shift engagement sleeve 1 to slide back and forth.

[0049] During operation, the shift motor 20 starts to drive the shift engagement sleeve 1 to slide axially along the first-stage external gear ring 18, thereby enabling the shift engagement sleeve 1 to engage with the first-stage engagement sleeve 2 or the second-stage engagement sleeve 3, achieving rapid shifting and convenient switching.

[0050] Based on the above scheme, the shift motor 20 adopts the existing technology. Its specific principle is as follows: after the coil inside the shift motor 20 is energized, it generates a magnetic field, which interacts with the permanent magnet or electromagnet, driving the shift engagement sleeve 1 to slide, so as to complete the engagement or disengagement of the shift engagement sleeve 1 with the first gear engagement sleeve 2 or the second gear engagement sleeve 3.

[0051] Example 8 Based on the above embodiments, this embodiment also provides an electric drive system, including a left half-shaft 21, a right half-shaft 22, and a two-speed coaxial transmission as described above. The left half-shaft 21 and the right half-shaft 22 are coaxially distributed, and the first-stage inner planetary gear set and the second-stage inner planetary gear set are coaxially sleeved outside the left half-shaft 21. The input end of the left half-shaft 21 is fixedly connected to the second-stage inner planetary carrier 12, and the input end of the right half-shaft 22 is fixedly connected to the second-stage outer planetary carrier 7.

[0052] During operation, the gear shifting sleeve 1 is slid in a manner conceived by those skilled in the art, and the specific gear shifting is as follows: (1) First gear mode: When the shift sleeve 1 and the first gear sleeve 2 are engaged, one power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then output by the left half shaft 21; the other power is transmitted from the first-stage inner planetary gear set to the second-stage inner planetary gear set, and then from the second-stage inner planetary gear set to the second-stage outer planetary gear set, and then output by the right half shaft 22. (2) Second gear mode: When the shift sleeve 1 and the second gear sleeve 3 are engaged, the power is transmitted from the first-stage inner planetary gear set to the second-stage inner sun gear of the second-stage inner planetary gear set, and then output by the left half shaft 21; the other power is transmitted to the second-stage outer ring gear of the second-stage outer planetary gear set, and then output by the right half shaft 22. (3) Neutral mode: When the shift sleeve 1 is between the first gear shift sleeve 2 and the second gear shift sleeve 3, the first-stage planetary gear set rotates in idling and there is no power output; In addition, this embodiment also provides an electric drive system with a compact structure and reasonable design. It provides a coaxial 2-speed electric drive axle without traditional differential gears; the first stage features nested inner and outer planetary gear sets, which can switch between high and low gears.

[0053] Example 9 Based on embodiment 8, this embodiment also includes a hollow shaft motor 23, which is coaxially sleeved outside the left half shaft 21, and its drive end is fixedly connected to the first-stage inner sun gear 8.

[0054] The solution has a simple structure and reasonable design. During operation, the hollow shaft motor 23 provides power to the entire drive system, making it easy to drive. In addition, the hollow shaft motor 23 adopts a hollow shaft structure, which facilitates the connection between the drive end of the hollow shaft motor 23 and the first-stage inner sun gear 8, and does not affect the assembly of the left half shaft 21. It is easy to assemble and saves space.

[0055] Based on the above scheme, the other end of the left half-shaft 21 extends to the outside of the hollow shaft motor 23 and is connected to the corresponding equipment.

[0056] In addition, the hollow shaft motor 23 and the left half shaft 21 do not interfere with each other.

[0057] Example 10 Based on the above embodiments, this embodiment also provides an automobile, including the electric drive system described above.

[0058] This embodiment also provides a car with a compact structure and reasonable design, which provides a coaxial 2-speed electric drive axle and no traditional differential gear; the first stage inner and outer planetary gears are nested, and high and low gears can be switched.

[0059] This invention provides a two-speed coaxial transmission, an electric drive system, and a vehicle, the working principle of which is as follows: (1) First gear mode: The shift sleeve is in the left position (connected to the planet carrier of the first stage inner planetary gear set); the motor power is transmitted to the sun gear of the second stage inner planetary gear set in two paths (path 1: sun gear of the first stage inner planetary gear set --> planet gear of the first stage inner planetary gear set --> planet carrier of the first stage inner planetary gear set --> sun gear of the second stage inner planetary gear set; path 2: sun gear of the first stage inner planetary gear set --> planet gear of the first stage inner planetary gear set --> ring gear of the first stage inner planetary gear set --> sun gear of the first stage outer planetary gear set --> planet gear of the first stage outer planetary gear set --> ring gear of the first stage outer planetary gear set --> first stage The power from the sun gear of the second-stage inner planetary gear set is transmitted in two paths: one path from the sun gear of the second-stage inner planetary gear set to the left half-shaft via the planet carrier (sun gear of the second-stage inner planetary gear set → planet gears of the second-stage inner planetary gear set → planet carrier of the second-stage inner planetary gear set → left half-shaft); the other path transmits the power to the right half-shaft via the ring gear of the second-stage outer planetary gear set (sun gear of the second-stage inner planetary gear set → planet gears of the second-stage inner planetary gear set → ring gear of the second-stage inner planetary gear set → sun gear of the second-stage outer planetary gear set → ring gear of the second-stage outer planetary gear set → right half-shaft) (see reference). Figure 2 ); (2) Second gear mode: The shift engagement sleeve is in the right position (connected to the planet carrier of the first-stage external planetary gear set, fixed and not rotating); the motor power is transmitted from the first-stage internal planetary gear set to the sun gear of the second-stage internal planetary gear set (sun gear of the first-stage internal planetary gear set --> planet gear of the first-stage internal planetary gear set --> planet carrier of the first-stage internal planetary gear set --> sun gear of the second-stage internal planetary gear set); the power of the sun gear of the second-stage internal planetary gear set is transmitted to the left half shaft through the planet carrier of the second-stage internal planetary gear set (sun gear of the second-stage internal planetary gear set --> planet gear of the second-stage internal planetary gear set --> planet carrier of the second-stage internal planetary gear set --> left half shaft); another path is transmitted to the right half shaft through the gear ring of the second-stage external planetary gear set (sun gear of the second-stage internal planetary gear set --> planet gear of the second-stage internal planetary gear set --> gear ring of the second-stage internal planetary gear set --> sun gear of the second-stage external planetary gear set --> gear ring of the second-stage external planetary gear set --> right half shaft) (refer to Figure 3 ); (3) Neutral mode: The shift sleeve is in the middle position (the gear ring can rotate freely), the first stage inner planetary gear set rotates idling, and there is no power output (refer to...). Figure 4 ).

[0060] The two-speed coaxial transmission, electric drive system, and automobile provided by this invention have the following advantages: 1. Coaxial 2-speed electric drive axle, without traditional differential gears, with a compact structure; 2. The first level features nested inner and outer planetary gears, allowing for switching between high and low gears.

[0061] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of the invention is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A two-speed coaxial transmission, characterized in that, include: The gear shifting sleeve (1), first gear shifting sleeve (2), second gear shifting sleeve (3), first-stage embedded planetary gear and second-stage embedded planetary gear, wherein the first-stage embedded planetary gear includes a first-stage inner planetary gear set and a first-stage outer planetary gear set, wherein the first-stage inner planetary gear set is coaxially embedded in the first-stage outer planetary gear set; wherein the second-stage embedded planetary gear includes a second-stage inner planetary gear set and a second-stage outer planetary gear set, wherein the second-stage inner planetary gear set is coaxially embedded in the second-stage outer planetary gear set; the second-stage inner planetary gear set and the first-stage inner planetary gear set are coaxially distributed, and the second-stage outer planetary gear set and the first-stage outer planetary gear set are coaxially distributed. The first-stage inner planet carrier (4) of the first-stage inner planetary gear set is connected to the second-stage inner sun gear (5) of the second-stage inner planetary gear set. The first-stage outer planet carrier (6) of the first-stage outer planetary gear set and the second-stage outer planet carrier (7) of the second-stage outer planetary gear set are fixedly installed respectively. The first gear engagement sleeve (2) is fixedly connected to the first-stage inner planet carrier (4), and the second gear engagement sleeve (3) is fixedly connected to the first-stage outer planet carrier (6). The shift engagement sleeve (1) is installed between the first gear engagement sleeve (2) and the second gear engagement sleeve (3), and it can slide to engage with the first gear engagement sleeve (2) or the second gear engagement sleeve (3).

2. The two-speed coaxial transmission according to claim 1, characterized in that, The first-stage internal planetary gear set also includes a first-stage internal sun gear (8), a first-stage internal gear ring (9), and multiple first-stage internal planetary gears (10). The first-stage internal sun gear (8) can rotate around its own axis, and the first-stage internal gear ring (9) is coaxially sleeved outside the first-stage internal sun gear (8). The first-stage internal planetary carrier (4) is distributed between the first-stage internal sun gear (8) and the first-stage internal gear ring (9). Multiple first-stage internal planetary gears (10) are evenly spaced along the circumference of the first-stage internal sun gear (8) on the first-stage internal planetary carrier (4), and they mesh with the first-stage internal gear ring (9) and the first-stage internal sun gear (8) respectively. Multiple first-stage internal planetary gears (10) can rotate around their own axis and can revolve around the first-stage internal sun gear (8) respectively.

3. The two-speed coaxial transmission according to claim 2, characterized in that, The secondary internal planetary gear set also includes a secondary internal gear ring (11), a secondary internal planet carrier (12), and multiple secondary internal planetary gears (13). The secondary internal sun gear (5) is coaxially distributed on one side of the primary internal sun gear (8) and can rotate around its own axis. The secondary internal gear ring (11) is coaxially sleeved outside the secondary internal sun gear (5) and can rotate around its own axis. The secondary internal planet carrier (12) is distributed between the secondary internal gear ring (11) and the secondary internal sun gear (5). Multiple secondary internal planetary gears (13) are evenly spaced along the circumference of the secondary internal sun gear (5) on the secondary internal planet carrier (12) and mesh with the secondary internal gear ring (11) and the secondary internal sun gear (5) respectively. Multiple secondary internal planetary gears (13) can rotate around their own axis and can revolve around the secondary internal sun gear (5) respectively.

4. The two-speed coaxial transmission according to claim 3, characterized in that, The secondary outer planetary gear set also includes a secondary outer sun gear (14), a secondary outer gear ring (15), and multiple secondary outer planet gears (16). The secondary outer sun gear (14) is coaxially fixedly sleeved outside the secondary inner gear ring (11) and can rotate together with the secondary inner gear ring (11). The secondary outer gear ring (15) is coaxially sleeved outside the secondary outer sun gear (14), and the secondary outer planetary carrier (7) is distributed between the secondary outer sun gear (14) and the secondary outer gear ring (15). Multiple secondary outer planetary gears (16) are evenly spaced along the circumference of the secondary outer sun gear (14) on the secondary outer planet carrier (7), and respectively mesh with the secondary outer gear ring (15) and the secondary outer sun gear (14); Each of the secondary outer planetary gears (16) can rotate around its own axis and can revolve around the secondary outer sun gear (14).

5. The two-speed coaxial transmission according to claim 2, characterized in that, The first-stage outer planetary gear set also includes a first-stage outer sun gear (17), a first-stage outer gear ring (18), and multiple first-stage outer planet gears (19). The first-stage outer sun gear (17) is coaxially fixedly sleeved outside the first-stage inner gear ring (9) and can rotate together with the first-stage inner gear ring (9). The first-stage outer gear ring (18) is coaxially sleeved outside the first-stage outer sun gear (17). The first-stage outer planet carrier (6) is distributed between the first-stage outer sun gear (17) and the first-stage outer gear ring (18). Multiple first-stage outer planet gears (19) are evenly spaced along the circumference of the first-stage outer sun gear (17) on the first-stage outer planet carrier (6) and mesh with the first-stage outer gear ring (18) and the first-stage outer sun gear (17) respectively. Multiple first-stage outer planet gears (19) can rotate around their own axis and can revolve around the first-stage outer sun gear (17) respectively.

6. The two-speed coaxial transmission according to claim 5, characterized in that, The primary external gear ring (18) can rotate around its own axis, and the shift engagement sleeve (1) is connected to the primary external gear ring (18), which can slide back and forth along the axis of the primary external gear ring (18).

7. The two-speed coaxial transmission according to claim 6, characterized in that, It also includes a shift motor (20), which is fixedly disposed on one side of the shift engagement sleeve (1) and is used to drive the shift engagement sleeve (1) to slide back and forth.

8. An electric drive system, characterized in that, Includes a left half-shaft (21), a right half-shaft (22), and a two-speed coaxial transmission as described in any one of claims 3-7. The left half-shaft (21) and the right half-shaft (22) are coaxially distributed, and the first-stage inner planetary gear set and the second-stage inner planetary gear set are coaxially sleeved outside the left half-shaft (21). The input end of the left half-shaft (21) is fixedly connected to the second-stage inner planetary carrier (12), and the input end of the right half-shaft (22) is fixedly connected to the second-stage outer planetary carrier (7).

9. The electric drive system according to claim 8, characterized in that, It also includes a hollow shaft motor (23), which is coaxially sleeved outside the left half shaft (21), and its drive end is fixedly connected to the first-stage inner sun gear (8).

10. A car, characterized in that, Including the electric drive system as described in any one of claims 8-9.

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