A gearbox for an electric vehicle

Abstract

The utility model discloses a gearbox for electric vehicle relates to vehicle technical field, including box, be provided with planetary gear, first rotating shaft, second rotating shaft, third rotating shaft, fourth rotating shaft and moving gear set in the box, the gear ring of planetary gear is fixedly connected with the box, the sun wheel axle in planetary gear is used for connecting with the output shaft of the drive motor of electric vehicle, the planet carrier of planetary gear is coaxial with first rotating shaft and is fixedly connected with one end of first rotating shaft, the other end of first rotating shaft is rotatably connected with the box, and moving gear set includes the coaxial setting first gear and second gear, and second gear is fixedly connected with first gear, and first gear and second gear are respectively connected with first rotating shaft thread, and first rotating shaft is fixedly provided with first limit ring and second limit ring. The utility model can make the gearbox automatic in neutral state when electric vehicle is coasting, reduce the energy loss of electric vehicle under the coasting state, reduce the noise, improve the coasting distance of electric vehicle.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a gearbox for electric vehicles. Background Technology

[0002] During the driving of electric vehicles (including electric cars, electric motorcycles, etc.), when the electric vehicle is in a coasting state and the user is not in neutral, the drive motor does not output speed, but the output shaft of the drive motor remains connected to the input shaft of the gearbox. The rotation of the wheels will drive the output shaft of the drive motor to rotate through the transmission structure such as the gearbox. However, due to the strong magnetic attraction between the stator and rotor of the motor (especially permanent magnet synchronous motors) or the magnetic hysteresis resistance generated by electromagnetic induction, a significant reverse torque will be formed. This resistance will consume a large amount of the vehicle's kinetic energy or gravitational potential energy, reducing the distance that the electric vehicle can coast.

[0003] In addition, the gearboxes of traditional electric vehicles require a clutch and a shift lever for gear shifting, which is relatively cumbersome. Utility Model Content

[0004] The purpose of this invention is to provide a gearbox for electric vehicles to solve the problems existing in the prior art and reduce the energy loss of electric vehicles in the coasting state.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a gearbox for electric vehicles, including a housing. The housing contains planetary gears, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, and a set of movable gears. The second, third, and fourth rotating shafts are rotatably engaged with the housing. A fifth gear is fixedly mounted on the second rotating shaft. A third, fourth, and sixth gear are fixedly mounted on the third rotating shaft. A seventh gear is fixedly mounted on the fourth rotating shaft. The fifth gear meshes with the fourth gear, and the sixth gear meshes with the seventh gear.

[0007] The ring gear of the planetary gear is fixedly connected to the housing, the sun gear shaft of the planetary gear is used to connect to the output shaft of the drive motor of the electric vehicle, and the planet carrier of the planetary gear is coaxial with the first rotating shaft and fixedly connected to one end of the first rotating shaft.

[0008] The other end of the first rotating shaft is rotatably connected to the housing. The movable gear set includes a first gear and a second gear coaxially arranged. The second gear is fixedly connected to the first gear. The first gear and the second gear are threadedly connected to the first rotating shaft. The second gear is closer to the planetary carrier than the first gear. A first limiting ring and a second limiting ring are fixedly sleeved on the first rotating shaft for axially limiting the movable gear set. The movable gear set is located between the first limiting ring and the second limiting ring, and the second limiting ring is closer to the planetary carrier than the first limiting ring. When the movable gear set abuts against the second limiting ring, the second gear meshes with the fifth gear. When the movable gear set abuts against the first limiting ring, the first gear meshes with the third gear.

[0009] Preferably, the diameter of the first gear is smaller than the diameter of the third gear; the diameter of the second gear is larger than the diameter of the fifth gear, and the diameter of the fifth gear is larger than the diameter of the fourth gear.

[0010] Preferably, the diameter of the sixth gear is smaller than the diameter of the seventh gear.

[0011] Preferably, the assembly further includes a reversing ring and a shift fork. The reversing ring is sleeved on the first rotating shaft, and the shift fork can drive the reversing ring to slide axially along the first rotating shaft. The reversing ring is circumferentially limited and connected to the first rotating shaft. The reversing ring is located on the side of the moving gear set away from the planetary gear. A first end face gear ring is provided at one end of the moving gear set near the reversing ring, and a second end face gear ring is provided at one end of the reversing ring near the moving gear set. The first end face gear ring can mesh with the second end face gear ring.

[0012] Preferably, when the moving gear set abuts against the first limiting ring, the teeth on the first end face gear ring are aligned with the tooth grooves on the second end face gear ring, and the teeth on the second end face gear ring are aligned with the tooth grooves on the first end face gear ring.

[0013] Preferably, the inner wall of the reversing ring is provided with at least one protrusion, the length direction of the protrusion is parallel to the axial direction of the first rotating shaft, and the outer wall of the first rotating shaft is provided with a sliding groove corresponding to the protrusion, and the protrusion slides in cooperation with the corresponding sliding groove.

[0014] Preferably, the first gear is fixedly connected to the second gear by a plurality of bolts, the axial direction of the bolts being parallel to the axial direction of the first gear, and all the bolts being evenly distributed along the circumference of the first gear.

[0015] Preferably, the shift fork mechanism includes a shift fork, a traction line, a return spring, and a sleeve. The sleeve is disposed inside the housing and fixedly connected to the inner wall of the housing. The housing wall has a through hole communicating with the sleeve. The shift fork includes a moving rod and a connecting rod. The moving rod is slidably engaged with the sleeve and the through hole. The moving rod, the through hole, and the sleeve are coaxial. The axial direction of the sleeve is parallel to the axial direction of the first rotating shaft. One end of the moving rod extends out of the housing and is connected to one end of the traction line. One end of the connecting rod is fixedly connected to the moving rod, and the other end is inserted into an annular groove on the outer wall of the reversing ring. The shift fork mechanism is used to move the reversing ring axially without affecting the rotation of the reversing ring with the first rotating shaft. The return spring is sleeved on the sleeve. One end of the return spring abuts against the housing, and the other end abuts against the connecting rod. The other end of the traction line is fixedly connected to the reversing control mechanism.

[0016] Preferably, the first gear is welded to the second gear.

[0017] Preferably, the number of the protrusions is four.

[0018] The present invention achieves the following technical advantages over the prior art:

[0019] This utility model discloses a gearbox for electric vehicles. By threading a movable gear set within the gearbox to a first rotating shaft, when the electric vehicle is coasting, the rotation of the wheels drives the fourth, third, and second rotating shafts within the gearbox to rotate. Regardless of whether the first and third gears are engaged, or the second and fifth gears are engaged, the movable gear set can move axially relative to the first rotating shaft, disengaging either the first or third gear, or the second or fifth gear. This puts the gearbox in neutral. In other words, the gearbox automatically enters neutral while the electric vehicle is coasting, thus avoiding the reverse torque generated by the strong magnetic attraction between the motor stator and rotor (especially in permanent magnet synchronous motors) or the hysteresis resistance caused by electromagnetic induction. This reduces energy loss during coasting and increases the vehicle's coasting distance. Simultaneously, since it does not drive the output shaft of the drive motor, it also reduces noise and makes the vehicle run more smoothly.

[0020] Furthermore, the electric vehicle gearbox of this invention can achieve different output speeds by switching the direction of the drive motor during use, i.e., perform gear shifting operations. Compared with the traditional method of shifting gears by using a clutch and a shift lever, it is simpler and more convenient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the electric vehicle gearbox of this utility model in the low-speed transmission and forward driving state.

[0023] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a schematic diagram of the structure of the first rotating shaft in this utility model;

[0025] Figure 4 This is a schematic diagram of the movable pulley block in this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the electric vehicle gearbox of this utility model in the high-speed transmission and forward movement state;

[0027] Figure 6 This is a schematic diagram of the structure of the electric vehicle gearbox of this utility model in the reverse state;

[0028] Figure 7 This is a schematic diagram of the shift fork structure in this utility model;

[0029] In the diagram: 1. First gear; 2. Second gear; 3. Third gear; 4. Fourth gear; 5. Fifth gear; 6. Sixth gear; 7. Seventh gear; 8. Gear ring; 9. Planetary carrier; 10. Second shaft; 11. Third shaft; 12. Fourth shaft; 13. Reversing ring; 14. Second end face gear ring; 15. First end face gear ring; 16. Housing; 17. Traction line; 18. Moving rod; 19. Connecting rod; 20. Sleeve; 21. First shaft; 22. Slide groove; 23. External thread; 24. First limiting ring; 25. Second limiting ring; 26. Bolt; 27. Internal thread; 28. Return spring; 29. ​​Shift fork; 30. Annular groove. Detailed Implementation

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

[0031] The purpose of this invention is to provide a gearbox for electric vehicles to solve the problems existing in the prior art and reduce the energy loss of electric vehicles in the coasting state.

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 7 As shown in the figure, this embodiment provides a gearbox for electric vehicles, including a housing 16 (for ease of observation, only a portion of the structure of the housing 16 is shown in the figure). The housing 16 contains planetary gears, a first rotating shaft 21, a second rotating shaft 10, a third rotating shaft 11, a fourth rotating shaft 12, and a moving gear set. The second rotating shaft 10, the third rotating shaft 11, and the fourth rotating shaft 12 are rotatably engaged with the housing 16. A fifth gear 5 is fixedly mounted on the second rotating shaft 10, a third gear 3, a fourth gear 4, and a sixth gear 6 are fixedly mounted on the third rotating shaft 11, and a seventh gear 7 is fixedly mounted on the fourth rotating shaft 12. The fifth gear 5 meshes with the fourth gear 4, and the sixth gear 6 meshes with the seventh gear 7.

[0034] The ring gear 8 of the planetary gear is fixedly connected to the housing 16. The sun gear shaft in the planetary gear is used to connect to the output shaft of the drive motor of the electric vehicle. The planet carrier 9 of the planetary gear is coaxial with the first rotating shaft 21 and fixedly connected to one end of the first rotating shaft 21.

[0035] The other end of the first rotating shaft 21 is rotatably connected to the housing 16. The moving gear set includes a first gear 1 and a second gear 2 arranged coaxially. The second gear 2 is fixedly connected to the first gear 1. The first gear 1 and the second gear 2 are threadedly connected to the first rotating shaft 21. An external thread 23 is provided on the first rotating shaft 21. An internal thread 27 for engaging with the external thread 23 is provided on the inner wall of the first gear 1 and the second gear 2, respectively. The second gear 2 is closer to the planet carrier 9 than the first gear 1. A first limiting ring 24 and a second limiting ring 25 for axially limiting the moving gear set are fixedly sleeved on the first rotating shaft 21. The moving gear set is located between the first limiting ring 24 and the second limiting ring 25, and the second limiting ring 25 is closer to the planet carrier 9 than the first limiting ring 24. When the moving gear set abuts against the second limiting ring 25, the second gear 2 meshes with the fifth gear 5. When the moving gear set abuts against the first limiting ring 24, the first gear 1 meshes with the third gear 3.

[0036] In the optional schemes of this embodiment, it is more preferred that the diameter of the first gear 1 is smaller than the diameter of the third gear 3. When the first gear 1 and the third gear 3 mesh, the transmission ratio of the gearbox is low, and the gearbox outputs at low speed. The diameter of the second gear 2 is larger than the diameter of the fifth gear 5, and the diameter of the fifth gear 5 is larger than the diameter of the fourth gear 4. When the second gear 2 and the fifth gear 5 mesh, the transmission ratio of the gearbox is high, and the gearbox outputs at high speed.

[0037] In the optional scheme of this embodiment, it is more preferred that the diameter of the sixth gear 6 is smaller than the diameter of the seventh gear 7, the fifth gear 5 and the fourth gear 4 are always in a meshing state, and the sixth gear 6 and the seventh gear 7 are also always in a meshing state.

[0038] In the optional embodiments of this example, a more preferred option is to include a reversing ring 13 and a shift fork mechanism. The reversing ring 13 is sleeved on the first rotating shaft 21, and the shift fork mechanism can drive the reversing ring 13 to slide axially along the first rotating shaft 21. The reversing ring 13 is circumferentially limited to the first rotating shaft 21. The reversing ring 13 is located on the side of the moving gear set away from the planetary gear. A first end face gear ring 15 is provided at one end of the moving gear set near the reversing ring 13, and a second end face gear ring 14 is provided at one end of the reversing ring 13 near the moving gear set. The first end face gear ring 15 can mesh with the second end face gear ring 14.

[0039] In the optional scheme of this embodiment, it is more preferred that when the moving gear set abuts against the first limiting ring 24, the teeth on the first end face gear ring 15 are aligned with the tooth grooves on the second end face gear ring 14, and the teeth on the second end face gear ring 14 are aligned with the tooth grooves on the first end face gear ring 15.

[0040] In the optional scheme of this embodiment, more preferably, four protrusions are provided on the inner wall of the reversing ring 13. The length direction of the protrusions is parallel to the axial direction of the first rotating shaft 21. The outer wall of the first rotating shaft 21 is provided with a sliding groove 22 corresponding to the protrusions. The protrusions slide in cooperation with the corresponding sliding grooves 22. The width of the protrusions is equal to the width of the corresponding sliding grooves 22. Through the cooperation of the protrusions and the corresponding sliding grooves 22, the reversing ring 13 can slide along the axial direction of the first rotating shaft 21, and the reversing ring 13 cannot rotate circumferentially relative to the first rotating shaft 21, so that the first rotating shaft 21 and the reversing ring 13 can rotate synchronously.

[0041] In this embodiment, the first gear 1 is fixedly connected to the second gear 2 by a plurality of bolts 26. The axial direction of the bolts 26 is parallel to the axial direction of the first gear 1, and all the bolts 26 are evenly distributed along the circumference of the first gear 1. It is worth noting that in practical applications, the moving gear set can also be integrally formed, or the first gear 1 and the second gear 2 can be welded together. In short, as long as the fixed connection between the first gear 1 and the second gear 2 can be guaranteed, it is acceptable.

[0042] In the optional embodiments of this example, a preferred embodiment includes a shift fork mechanism comprising a shift fork 29, a traction wire 17, a return spring 28, and a sleeve 20. The sleeve 20 is disposed within the housing 16 and fixedly connected to the inner wall of the housing 16. The housing wall of the housing 16 has a through hole communicating with the sleeve 20. The shift fork 29 includes a moving rod 18 and a connecting rod 19. The moving rod 18 is slidably engaged with the sleeve 20 and the through hole. The moving rod 18, the through hole, and the sleeve 20 are coaxial, and the axial direction of the sleeve 20 is parallel to the axial direction of the first rotating shaft 21. One end of the connecting rod 18 extends out of the housing 16 and is connected to one end of the traction line 17. One end of the connecting rod 19 is fixedly connected to the moving rod 18, and the other end is inserted into the annular groove 30 on the outer side wall of the reversing ring 13. The shift fork mechanism is used to move the reversing ring 13 axially along the first rotating shaft 21 without affecting the rotation of the reversing ring 13 with the first rotating shaft 21. The return spring 28 is sleeved on the sleeve 20, with one end abutting against the housing 16 and the other end abutting against the connecting rod 19. The other end of the traction line 17 is fixedly connected to the reversing control mechanism. By pulling or loosening the traction line 17 through the reversing control mechanism, the moving rod 18 moves, which in turn causes the connecting rod 19 to drive the reversing ring 13 to move, thereby achieving effective control of the position of the reversing ring 13. Specifically, when the traction cable 17 is pulled by the reversing mechanism, the moving rod 18 will move outward from the gearbox housing 16. The moving rod 18, through the connecting rod 19, will move the reversing ring 13 away from the planetary support, causing the second end face gear ring 14 to disengage from the first end face gear ring 15. When the traction cable 17 is loosened by the reversing mechanism, the connecting rod 19 in the shift fork 29 will, under the elastic force of the return spring 28, move the moving rod 18 into the gearbox housing. At the same time, the connecting rod 19 will move the reversing ring 13 towards the planetary support, allowing the second end face gear ring 14 to mesh with the first end face gear ring 15 (if the moving gear set abuts against the first limit ring 24 at this time).

[0043] The specific working principle of the gearbox in this embodiment is as follows:

[0044] (1) The electric vehicle is moving forward, i.e., in a forward-moving state:

[0045] In this state, the first end face gear ring 15 and the second end face gear ring 14 need to be disengaged and not meshed. When the drive motor of the electric vehicle needs to be able to rotate forward and reverse, in this embodiment, the rotation direction of the first rotating shaft 21 when it rotates to move the moving gear set towards the second limiting ring 25 is defined as the first direction of rotation, and the rotation direction of the first rotating shaft 21 when it rotates to move the moving gear set towards the second limiting ring 25 is defined as the second direction of rotation.

[0046] When the output shaft of the drive motor rotates in the first direction, it drives the sun gear and planet carrier 9 in the planetary gear set to rotate in the first direction as well. The planet carrier 9 drives the first rotating shaft 21 to rotate in the first direction. Due to the meshing thrust of the threads, the moving gear set moves along the first rotating shaft 21 toward the second limiting ring 25 until the moving gear set abuts against the second limiting ring 25, so that the second gear 2 meshes with the fifth gear 5 (e.g., Figure 5 As shown), the fifth gear 5 meshes with the fourth gear 4, thereby driving the third shaft 11 to rotate. The third shaft 11 drives the fourth shaft 12 to rotate through the meshing of the sixth gear 6 and the seventh gear 7. At this time, according to the gear transmission ratio, the fourth shaft 12 rotates forward at high speed.

[0047] When the output shaft of the drive motor rotates in the second direction, it drives the sun gear and planet carrier 9 in the planetary gear set to rotate in the second direction as well. The planet carrier 9 drives the first rotating shaft 21 to rotate in the second direction. Due to the meshing thrust of the threads, the moving gear set moves along the first rotating shaft 21 toward the first limiting ring 24 until the moving gear set abuts against the first limiting ring 24, so that the first gear 1 meshes with the third gear 3 (e.g., Figure 1 As shown), the third rotating shaft 11 is driven to rotate, and the third rotating shaft 11 drives the fourth rotating shaft 12 to rotate through the meshing of the sixth gear 6 and the seventh gear 7. At this time, although the drive motor rotates in the second direction, which is completely opposite to the first direction, the rotation direction of the fourth rotating shaft 12 remains unchanged because the gear transmission process does not pass through the fifth gear 5. At this time, according to the gear transmission ratio, the fourth rotating shaft 12 rotates forward at low speed.

[0048] (2) When the vehicle needs to reverse:

[0049] When the output shaft rotates at high speed, during reversing operation via the reversing mechanism, the reversing mechanism first transmits a signal to the drive motor via electronic circuitry, causing the drive motor's output shaft to rotate in the second direction. The planetary carrier 9 drives the first rotating shaft 21 to rotate in the second direction. Due to the meshing thrust of the threads, the moving gear set moves along the first rotating shaft 21 toward the first limiting ring 24 until the moving gear set abuts against the first limiting ring 24, causing the first gear 1 to mesh with the third gear 3. Simultaneously, the reversing mechanism loosens the traction cable 17, and the shift fork 29 drives the reversing ring 13 to move toward the planetary gear, causing the second end face gear ring 14 on the reversing ring 13 to mesh with the first end face gear ring 15 on the moving gear set. Subsequently, the drive motor will rotate around the first direction again. Because the second end face gear ring 14 meshes with the first end face gear ring 15, under the action of the interaction force between the second end face gear ring 14 and the first end face gear ring 15, the moving gear set will not move along the first rotating shaft 21, and the gearbox maintains the state of meshing between the first gear 1 and the third gear 3 (e.g., Figure 6(As shown), but because the rotation direction of the output shaft of the drive motor has changed, the fourth shaft 12 will rotate in the opposite direction, thereby realizing the reversing function;

[0050] When the output shaft rotates at low speed, by loosening the traction cable 17 through the reversing operating mechanism, the shift fork 29 drives the reversing ring 13 to move towards the planetary gear, causing the second end face gear ring 14 on the reversing ring 13 to mesh with the first end face gear ring 15 on the moving gear set. Subsequently, the drive motor will rotate around the first direction. Due to the meshing of the second end face gear ring 14 and the first end face gear ring 15, under the action of the interaction force between the second end face gear ring 14 and the first end face gear ring 15, the moving gear set will not move along the first rotating shaft 21, and the gearbox maintains the state of meshing between the first gear 1 and the third gear 3 (e.g., Figure 6 (As shown), but because the rotation direction of the output shaft of the drive motor has changed, the fourth shaft 12 will rotate in the opposite direction, thereby realizing the reversing function;

[0051] After the reversing process is completed, the reversing ring 13 is moved by the shift fork 29 to disengage the second end face gear ring 14 from the first end face gear ring 15. At this time, if the output shaft of the drive motor rotates around the first direction, due to the thread engagement thrust between the first rotating shaft 21 and the moving gear set, the moving gear set will slide back to the second limit ring 25, so that the second gear 2 meshes with the fifth gear 5. At this time, the fourth rotating shaft 12 will resume high-speed forward rotation. However, when the reversing process is completed and the second end face gear ring 14 disengages from the first end face gear ring 15, if the drive motor continues to rotate around the second direction, due to the thread engagement thrust, the moving gear set will not move along the first rotating shaft 21, and the fourth rotating shaft 12 will maintain low-speed forward rotation.

[0052] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gearbox for electric vehicles, characterized in that: The device includes a housing, within which are disposed planetary gears, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, and a set of movable gears. The second, third, and fourth rotating shafts are rotatably engaged with the housing. A fifth gear is fixedly mounted on the second rotating shaft, a third, fourth, and sixth gear are fixedly mounted on the third rotating shaft, and a seventh gear is fixedly mounted on the fourth rotating shaft. The fifth gear meshes with the fourth gear, and the sixth gear meshes with the seventh gear. The ring gear of the planetary gear is fixedly connected to the housing, the sun gear shaft of the planetary gear is used to connect to the output shaft of the drive motor of the electric vehicle, and the planet carrier of the planetary gear is coaxial with the first rotating shaft and fixedly connected to one end of the first rotating shaft. The other end of the first rotating shaft is rotatably connected to the housing. The movable gear set includes a first gear and a second gear coaxially arranged. The second gear is fixedly connected to the first gear. The first gear and the second gear are threadedly connected to the first rotating shaft. The second gear is closer to the planetary carrier than the first gear. A first limiting ring and a second limiting ring are fixedly sleeved on the first rotating shaft for axially limiting the movable gear set. The movable gear set is located between the first limiting ring and the second limiting ring, and the second limiting ring is closer to the planetary carrier than the first limiting ring. When the movable gear set abuts against the second limiting ring, the second gear meshes with the fifth gear. When the movable gear set abuts against the first limiting ring, the first gear meshes with the third gear.

2. The gearbox for electric vehicles according to claim 1, characterized in that: The diameter of the first gear is smaller than the diameter of the third gear; the diameter of the second gear is larger than the diameter of the fifth gear, and the diameter of the fifth gear is larger than the diameter of the fourth gear.

3. The gearbox for electric vehicles according to claim 1, characterized in that: The diameter of the sixth gear is smaller than the diameter of the seventh gear.

4. The gearbox for electric vehicles according to claim 1, characterized in that: It also includes a reversing ring and a shift fork mechanism. The reversing ring is sleeved on the first rotating shaft, and the shift fork mechanism can drive the reversing ring to slide axially along the first rotating shaft. The reversing ring is circumferentially limited to the first rotating shaft. The reversing ring is located on the side of the moving gear set away from the planetary gear. A first end face gear ring is provided at one end of the moving gear set near the reversing ring, and a second end face gear ring is provided at one end of the reversing ring near the moving gear set. The first end face gear ring can mesh with the second end face gear ring.

5. The gearbox for electric vehicles according to claim 4, characterized in that: When the moving gear set abuts against the first limiting ring, the teeth on the first end face gear ring are aligned with the tooth grooves on the second end face gear ring, and the teeth on the second end face gear ring are aligned with the tooth grooves on the first end face gear ring.

6. The gearbox for electric vehicles according to claim 4, characterized in that: The inner wall of the reversing ring is provided with at least one protrusion, the length direction of the protrusion is parallel to the axial direction of the first rotating shaft, and the outer wall of the first rotating shaft is provided with a sliding groove corresponding to the protrusion, and the protrusion slides in cooperation with the corresponding sliding groove.

7. The gearbox for electric vehicles according to claim 1, characterized in that: The first gear is fixedly connected to the second gear by a plurality of bolts, the axial direction of the bolts being parallel to the axial direction of the first gear, and all the bolts being evenly distributed along the circumference of the first gear.

8. The gearbox for electric vehicles according to claim 4, characterized in that: The shift fork mechanism includes a shift fork, a traction line, a return spring, and a sleeve. The sleeve is disposed inside the housing and fixedly connected to the inner wall of the housing. A through hole communicating with the sleeve is provided on the housing wall. The shift fork includes a moving rod and a connecting rod. The moving rod is slidably engaged with the sleeve and the through hole. The moving rod, the through hole, and the sleeve are coaxial. The axial direction of the sleeve is parallel to the axial direction of the first rotating shaft. One end of the moving rod extends out of the housing and is connected to one end of the traction line. One end of the connecting rod is fixedly connected to the moving rod, and the other end is inserted into an annular groove on the outer wall of the reversing ring. The shift fork mechanism is used to move the reversing ring axially without affecting the rotation of the reversing ring with the first rotating shaft. The return spring is sleeved on the sleeve. One end of the return spring abuts against the housing, and the other end abuts against the connecting rod. The other end of the traction line is fixedly connected to the reversing control mechanism.

9. The gearbox for electric vehicles according to claim 1, characterized in that: The first gear is welded to the second gear.

10. The gearbox for electric vehicles according to claim 6, characterized in that: The number of raised strips is four.

Images