An integrated electric drive axle two-speed reducer transmission device

Abstract

The present invention discloses a two-speed reducer transmission device for an integrated electric drive axle, which includes a drive motor and a main shaft. The outer wall of the drive motor is connected with a first-stage planetary gear sun gear through splines, and three first-stage planetary gear planet gears are symmetrically meshed and connected to the outer wall of the first-stage planetary gear sun gear. In the present invention, the first-stage planetary gear sun gear drives three first-stage planetary gear planet gears, the first-stage planetary gear carrier drives the main shaft to rotate through spline connection, and the output driving gear is driven by the shift spline sleeve, thereby achieving the effect of secondary reduction of the half shaft. At the same time, by changing the position of the shift spline sleeve, the shift spline sleeve can be spline-connected to the second-stage planetary gear carrier while not disengaging from the output driving gear, so as to perform tertiary reduction on the half shaft. By adopting a coaxial design of the drive motor and the main shaft and selecting a planetary gear mechanism, the structure is compact, the overall weight is reduced, the volume is reduced, and the vehicle's cruising range is increased.

Description

Technical Field

[0001] The present invention relates to a transmission device, specifically an integrated electric drive axle two-speed reducer transmission device, belonging to the technical field of reducers. Background Technique

[0002] A speed reducer is generally used for transmission equipment with low speed and high torque. It reduces the speed by meshing a gear with fewer teeth on the input shaft of the speed reducer with a large gear on the output shaft of the motor, internal combustion engine or other high-speed rotating power source. Ordinary speed reducers also have several pairs of gears with the same principle to achieve the ideal deceleration effect. The ratio of the number of teeth of the large and small gears is the transmission ratio.

[0003] It is known that the Chinese published invention (publication number: CN114962591A) discloses an electric vehicle two-speed reducer. It drives the driving gear through the output shaft, the driving gear drives the first driven gear, the first driven gear drives the intermediate shaft, and the intermediate shaft drives the second driven gear. With the cooperation of the shift fork and the shift motor, when the first gear has a large speed ratio, the second driven gear drives the first gear, and when the second gear has a small speed ratio, the first driven gear drives the second gear, thereby achieving the effect of driving the transmission shaft;

[0004] However, its reducer uses a two-shaft structure for transmission, with a complex structure and large volume, increasing the vehicle's overall mass, thereby affecting the vehicle's endurance. Moreover, it has high requirements for the motor performance and the layout of the external dimensions. Therefore, an integrated electric drive axle two-speed reducer transmission device is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an integrated electric drive axle two-speed reducer transmission device to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An integrated electric drive axle two-speed reducer transmission device includes a driving motor and a main shaft. The outer wall of the driving motor is connected with a first-stage planetary gear sun gear through a spline. Three first-stage planetary gear planet gears are symmetrically meshed and connected to the outer wall of the first-stage planetary gear sun gear. The outer walls of the three first-stage planetary gear planet gears are jointly meshed and connected to a first-stage planetary gear ring gear. A first-stage planetary gear carrier is jointly installed on one side of the three first-stage planetary gear planet gears. An output driving gear is rotatably connected to the outer wall of the main shaft. A shift spline sleeve is connected to the outer wall of the main shaft through a spline. A second-stage planetary gear sun gear is connected to the outer wall of the main shaft through a spline. Five second-stage planetary gear planet gears are symmetrically meshed and connected to the outer wall of the second-stage planetary gear sun gear. A second-stage planetary gear carrier is jointly installed on one side of the five second-stage planetary gear planet gears. The axis of the output shaft of the driving motor coincides with the axis of the main shaft.

[0007] Further preferably, the outer sidewalls of the five second-stage planetary row planet gears are jointly meshed and connected to a second-stage planetary row ring gear. The outer sidewall of the second-stage planetary row ring gear is fixedly connected to a reduction gearbox housing. The main shaft is located inside the reduction gearbox housing. The inner sidewall of the first-stage planetary row planet carrier is connected to the outer sidewall of the main shaft through a spline.

[0008] Further preferably, the outer sidewall of the first-stage planetary row ring gear is fixedly connected to the inner sidewall of the reduction gearbox housing. A shift fork is provided on the outer sidewall of the shift spline sleeve.

[0009] Further preferably, one side of the outer wall of the output driving gear is meshed and connected to the inner sidewall of the shift spline sleeve. The output driving gear and the second-stage planetary row planet carrier are respectively located on both sides of the shift spline sleeve.

[0010] Further preferably, the side of the outer wall of the output driving gear away from the shift spline sleeve is meshed and connected to an output driven gear. The inner sidewall of the output driven gear is connected to a half shaft through a spline.

[0011] Further preferably, a differential housing is provided outside the output driven gear. The outer sidewall of the half shaft is rotatably connected to the inner sidewall of the differential housing.

[0012] Further preferably, a spline groove adapted to the shift spline sleeve is formed on the outer wall of the second-stage planetary row planet carrier near the shift spline sleeve.

[0013] Further preferably, two reduction gearbox end covers are symmetrically installed on both sides of the reduction gearbox housing. One end of the main shaft away from the drive motor penetrates through one side of the reduction gearbox end cover away from the reduction gearbox housing and is rotatably connected to the reduction gearbox end cover.

[0014] Further preferably, the drive motor is installed on the other side of the reduction gearbox end cover away from the reduction gearbox housing. The output shaft of the drive motor penetrates through the other side of the reduction gearbox end cover and is rotatably connected to the reduction gearbox end cover.

[0015] Further preferably, a groove is formed on the outer sidewall of the shift spline sleeve. The bottom end of the shift fork is slidably connected to the inner sidewall of the groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the sun gear of the first-stage planetary gear set drives three planetary gears of the first-stage planetary gear set. The planet carrier of the first-stage planetary gear set drives the main shaft to rotate through spline connection. The shift spline sleeve drives the output driving gear, thereby achieving the effect of secondary deceleration of the half shaft. At this time, it is a small speed ratio. At the same time, by changing the position of the shift spline sleeve, while the shift spline sleeve is not disengaged from the output driving gear, it is spline-connected to the planet carrier of the second-stage planetary gear set, which can perform tertiary deceleration on the half shaft. At this time, it is a large speed ratio. By adopting a coaxial design of the drive motor and the main shaft and selecting a planetary gear mechanism, the structure is compact, the overall weight is reduced, the volume is reduced, and the vehicle endurance mileage is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic structural diagram of the main shaft of the present invention;

[0019] Figure 3 is a schematic diagram of the connection between the output driving gear and the main shaft of the present invention;

[0020] Figure 4 For the present invention Figure 2 is an enlarged view of area A in.

[0021] In the figure: 1. Drive motor; 2. Sun gear of the first-stage planetary gear set; 3. Planetary gears of the first-stage planetary gear set; 4. Ring gear of the first-stage planetary gear set; 5. Planet carrier of the first-stage planetary gear set; 6. Main shaft; 7. Sun gear of the second-stage planetary gear set; 8. Planetary gears of the second-stage planetary gear set; 9. Planet carrier of the second-stage planetary gear set; 10. Ring gear of the second-stage planetary gear set; 11. Shift spline sleeve; 12. Shift fork; 13. Output driving gear; 14. Output driven gear; 16. Reducer housing; 17. Reducer end cover; 18. Axle housing; 19. Half shaft; 20. Groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment

[0024] Please refer to Figures 1-4, the present invention provides a technical solution: an integrated electric drive axle two-speed reducer transmission device, including a drive motor 1 and a main shaft 6. The outer wall of the drive motor 1 is connected with a first-stage planetary row sun gear 2 through splines. Three first-stage planetary row planet gears 3 are symmetrically meshed and connected to the outer wall of the first-stage planetary row sun gear 2. The outer walls of the three first-stage planetary row planet gears 3 are jointly meshed and connected with a first-stage planetary row ring gear 4. A first-stage planetary row planet carrier 5 is jointly installed on one side of the three first-stage planetary row planet gears 3. An output driving gear 13 is rotatably connected to the outer wall of the main shaft 6. A shift spline sleeve 11 is connected to the outer wall of the main shaft 6 through splines. A second-stage planetary row sun gear 7 is connected to the outer wall of the main shaft 6 through splines. Five second-stage planetary row planet gears 8 are symmetrically meshed and connected to the outer wall of the second-stage planetary row sun gear 7. A second-stage planetary row planet carrier 9 is jointly installed on one side of the five second-stage planetary row planet gears 8. The axis of the output shaft of the drive motor 1 coincides with the axis of the main shaft 6.

[0025] In this embodiment, specifically: the outer walls of the five second-stage planetary row planet gears 8 are jointly meshed and connected with a second-stage planetary row ring gear 10. The outer wall of the second-stage planetary row ring gear 10 is fixedly connected to a reduction gearbox housing 16. The main shaft 6 is located inside the reduction gearbox housing 16. The inner wall of the first-stage planetary row planet carrier 5 is connected to the outer wall of the main shaft 6 through splines. Thus, when the output shaft of the drive motor 1 rotates, the drive motor 1 drives the first-stage planetary row sun gear 2 to rotate. The first-stage planetary row sun gear 2 drives the three first-stage planetary row planet gears 3. Under the action of the first-stage planetary row ring gear 4, the first-stage planetary row planet gears 3 rotate around the main shaft 6 and rotate on their own axes, and at the same time drive the first-stage planetary row planet carrier 5 to rotate. Then, the main shaft 6 can be driven to rotate through the first-stage planetary row planet carrier 5. The main shaft 6 drives the shift spline sleeve 11 to rotate through splines. The shift spline sleeve 11 drives the output driving gear 13 to rotate through gears. Then, the torque can be transmitted to the half shaft 19 through the output driven gear 14. The half shaft 19 is connected to the wheel end. At this time, it is a small speed ratio two-stage reduction. When in two-stage reduction, the shift spline sleeve 11 is separated from the second-stage planetary row planet carrier 9.

[0026] In this embodiment, specifically: the outer sidewall of the ring gear 4 of the first planetary gear set is fixedly connected to the inner sidewall of the reduction gearbox housing 16. A shift fork 12 is provided on the outer sidewall of the shift spline sleeve 11. One side of the outer wall of the output driving gear 13 is meshed and connected to the inner sidewall of the shift spline sleeve 11. The output driving gear 13 and the planet carrier 9 of the second planetary gear set are respectively located on both sides of the shift spline sleeve 11. A groove 20 is formed on the outer sidewall of the shift spline sleeve 11. The bottom end of the shift fork 12 is slidably connected to the inner sidewall of the groove 20. A spline groove adapted to the shift spline sleeve 11 is formed on the outer wall of the planet carrier 9 of the second planetary gear set near the shift spline sleeve 11. Thus, the shift spline sleeve 11 can be pulled to move by the shift fork 12. When the shift spline sleeve 11 is connected to the outer wall of the planet carrier 9 of the second planetary gear set through the spline on the outer wall of the planet carrier 9 of the second planetary gear set, the planet carrier 9 of the second planetary gear set drives the output driving gear 13 through the shift spline sleeve 11. The output driving gear 13 drives the output driven gear 14 through the teeth. The output driven gear 14 drives the half shaft 19. Thus, a large reduction ratio three-stage reduction can be performed at this time.

[0027] In this embodiment, specifically: on the side of the outer wall of the output driving gear 13 away from the shift spline sleeve 11, there is a meshed connection with an output driven gear 14. The inner sidewall of the output driven gear 14 is connected to the half shaft 19 through a spline. By pulling the shift spline sleeve 11 to move with the shift fork 12, the shift spline sleeve 11 is connected to the outer wall of the planet carrier 9 of the second planetary gear set through a spline. At the same time, the shift spline sleeve 11 is separated from the spline on the surface of the main shaft 6. When the output shaft of the driving motor 1 rotates, the planet carrier 5 of the first planetary gear set drives the main shaft 6 to rotate through a spline connection. The main shaft 6 drives the sun gear 7 of the second planetary gear set through a spline. The sun gear 7 of the second planetary gear set drives five planet gears 8 of the second planetary gear set through the teeth. Under the action of the ring gear 10 of the second planetary gear set, the five planet gears 8 of the second planetary gear set drive the planet carrier 9 of the second planetary gear set to rotate. The planet carrier 9 of the second planetary gear set drives the shift spline sleeve 11 to rotate through a spline. The shift spline sleeve 11 drives the output driving gear 13 to rotate through the teeth. Thus, the torque can be transmitted to the half shaft 19 through the output driven gear 14. The half shaft 19 is connected to the wheel end to perform a large reduction ratio three-stage reduction.

[0028] In this embodiment, specifically: there is a axle housing 18 outside the output driven gear 14. The outer sidewall of the half shaft 19 is rotatably connected to the inner sidewall of the axle housing 18. By fixing the positions of the reduction gearbox housing 16 and the axle housing 18, the overall structure can be made stable to perform the reduction drive work.

[0029] In this embodiment, specifically: Two reducer end covers 17 are symmetrically installed on both sides of the reducer housing 16. One end of the main shaft 6 away from the drive motor 1 penetrates through one side of the reducer end cover 17 away from the reducer housing 16 and is rotatably connected to the reducer end cover 17. Thus, the position of the main shaft 6 can be fixed by the reducer housing 16 and the reducer end cover 17 to enhance the overall stability.

[0030] In this embodiment, specifically: The drive motor 1 is installed on the side of the other reducer end cover 17 away from the reducer housing 16. The output shaft of the drive motor 1 penetrates through the other side of the reducer end cover 17 and is rotatably connected to the reducer end cover 17. Thus, the position of the drive motor 1 can be fixed so that the drive motor 1 drives the first-stage planetary gear sun gear 2 to rotate through the output shaft.

[0031] When the present invention works, the output shaft of the driving motor 1 drives the sun gear 2 of the first-stage planetary gear set to rotate. The sun gear 2 of the first-stage planetary gear set drives three planetary gears 3 of the first-stage planetary gear set through teeth. Under the action of the ring gear 4 of the first-stage planetary gear set, the planetary gears 3 of the first-stage planetary gear set rotate around the main shaft 6 and rotate on their own axes. Therefore, the three planetary gears 3 of the first-stage planetary gear set can drive the planet carrier 5 of the first-stage planetary gear set to rotate around the main shaft 6. At the same time, the planet carrier 5 of the first-stage planetary gear set drives the main shaft 6 to rotate through splines. The main shaft 6 drives the shift spline sleeve 11 to rotate through splines. The shift spline sleeve 11 drives the output driving gear 13 to rotate. When the output driving gear 13 rotates, it drives the output driven gear 14 to rotate through teeth. Furthermore, the output driven gear 14 can drive the half shaft 19 to rotate, and the half shaft 19 drives the wheel end to rotate. At this time, it is a two-stage deceleration with a small speed ratio. The torque transmission path of the two-stage deceleration is: the output shaft of the driving motor 1 - the sun gear 2 of the first-stage planetary gear set - the planetary gears 3 of the first-stage planetary gear set - the planet carrier 5 of the first-stage planetary gear set - the main shaft 6 - the shift spline sleeve 11 - the output driving gear 13 - the output driven gear 14 - the half shaft 19 - the wheel end; when the shift fork 12 is pulled, the shift fork 12 drives the shift spline sleeve 11 to move. The shift spline sleeve 11 is connected to the outer wall of the planet carrier 9 of the second-stage planetary gear set through splines. At the same time, the shift spline sleeve 11 is separated from the splines on the surface of the main shaft 6. At this time, the main shaft 6 drives the sun gear 7 of the second-stage planetary gear set to rotate through splines. The sun gear 7 of the second-stage planetary gear set drives five planetary gears 8 of the second-stage planetary gear set to rotate around the main shaft 6 through teeth. At the same time, the five planetary gears 8 of the second-stage planetary gear set drive the planet carrier 9 of the second-stage planetary gear set to rotate. The planet carrier 9 of the second-stage planetary gear set drives the shift spline sleeve 11 to rotate through splines. The shift spline sleeve 11 drives the output driving gear 13 to rotate through teeth. The output driving gear 13 drives the output driven gear 14 to rotate through teeth. Furthermore, the output driven gear 14 can drive the half shaft 19 to rotate, and the half shaft 19 drives the wheel end to rotate. At this time, it is a three-stage deceleration with a large speed ratio. The torque transmission path of the three-stage deceleration is: the output shaft of the driving motor 1 - the sun gear 2 of the first-stage planetary gear set - the planetary gears 3 of the first-stage planetary gear set - the planet carrier 5 of the first-stage planetary gear set - the main shaft 6 - the sun gear 7 of the second-stage planetary gear set - the planetary gears 8 of the second-stage planetary gear set - the planet carrier 9 of the second-stage planetary gear set - the shift spline sleeve 11 - the output driving gear 13 - the output driven gear 14 - the half shaft 19 - the wheel end.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated two-speed reducer transmission device for an electric drive axle, comprising a drive motor (1) and a main shaft (6), characterized in that: The outer wall of the driving motor (1) is connected with the first-stage planetary gear sun gear (2) by splines. The outer wall of the first-stage planetary gear sun gear (2) is symmetrically meshed and connected with three first-stage planetary gear planet gears (3). The outer walls of the three first-stage planetary gear planet gears (3) are jointly meshed and connected with the first-stage planetary gear ring gear (4). One side of the three first-stage planetary gear planet gears (3) is jointly installed with the first-stage planetary gear carrier (5). The outer wall of the main shaft (6) is rotatably connected with the output driving gear (13). The outer wall of the main shaft (6) is connected with the shift spline sleeve (11) by splines. The outer wall of the main shaft (6) is connected with the second-stage planetary gear sun gear (7) by splines. The outer wall of the second-stage planetary gear sun gear (7) is symmetrically meshed and connected with three second-stage planetary gear planet gears (8). One side of the three second-stage planetary gear planet gears (8) is jointly installed with the second-stage planetary gear carrier (9). The axis of the output shaft of the driving motor (1) coincides with the axis of the main shaft (6); The outer wall of the first-stage planetary gear ring gear (4) is fixedly connected to the inner wall of the reduction gearbox housing (16). The outer wall of the shift spline sleeve (11) is provided with a shift fork (12); One side of the outer wall of the output driving gear (13) is meshed and connected with the inner wall of the shift spline sleeve (11). The output driving gear (13) and the second-stage planetary gear carrier (9) are respectively located on both sides of the shift spline sleeve (11); One side of the outer wall of the output driving gear (13) away from the shift spline sleeve (11) is meshed and connected with an output driven gear (14). The inner wall of the output driven gear (14) is connected with a half shaft (19) by splines; A spline groove adapted to the shift spline sleeve (11) is formed on one side of the outer wall of the second-stage planetary gear carrier (9) close to the shift spline sleeve (11).

2. The integrated electric drive axle two-speed reducer transmission device according to claim 1, characterized in that: The outer walls of the three second-stage planetary gear planet gears (8) are jointly meshed and connected with a second-stage planetary gear ring gear (10). The outer wall of the second-stage planetary gear ring gear (10) is fixedly connected with the reduction gearbox housing (16). The main shaft (6) is located inside the reduction gearbox housing (16). The inner wall of the first-stage planetary gear carrier (5) is connected to the outer wall of the main shaft (6) by splines.

3. An integrated electric drive axle two-speed reducer transmission device according to claim 2, characterized in that: A axle housing (18) is provided outside the output driven gear (14). The outer wall of the half shaft (19) is rotatably connected to the inner wall of the axle housing (18).

4. An integrated electric drive axle two-speed reducer transmission device according to claim 3, characterized in that: Two reduction gearbox end covers (17) are symmetrically installed on both sides of the reduction gearbox housing (16). One end of the main shaft (6) away from the driving motor (1) penetrates through one side of the reduction gearbox end cover (17) away from the reduction gearbox housing (16) and is rotatably connected to the reduction gearbox end cover (17).

5. The integrated electric drive axle two-speed reducer transmission device according to claim 4, characterized in that: The driving motor (1) is installed on one side of the other reduction gearbox end cover (17) away from the reduction gearbox housing (16). The output shaft of the driving motor (1) penetrates through the other side of the reduction gearbox end cover (17) and is rotatably connected to the reduction gearbox end cover (17).

6. The integrated electric drive axle two-speed reducer transmission device according to claim 5, characterized in that: A groove (20) is formed in the outer sidewall of the shift spline sleeve (11), and the bottom end of the shift fork (12) is slidably connected to the inner sidewall of the groove (20).

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