Electric drive axle equipped with a three-speed transmission mechanism

Abstract

An electric drive axle provided with a three-speed transmission mechanism is provided, including a power input device; a three-speed transmission mechanism; and a power output device; wherein, the three-speed transmission mechanism includes: a central shaft fixedly connected with a first power input gear and a first output engaging tooth, and used for transmitting the power of the first power input gear to the first output engaging tooth; a transmission shaft rotatably sleeved outside the central shaft, with one end fixedly connected to the box body and the other end fixedly connected with the sun gear of a double-star planetary gear set; a second power input gear connected with the planet carrier of the double-star planetary gear set and used for transmitting power to the planet carrier; a second output engaging tooth used for receiving power from the planet carrier; a third output engaging tooth used for receiving power from the ring gear of the double-star planetary gear set; and a shift sleeve. The electric drive axle has smoother shifting and improves the driving control comfort.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle components, and particularly to an electric drive axle provided with a three-speed transmission mechanism. Background Art

[0002] New energy vehicles have received increasing attention from the country. With the iterative development of electric drive technologies for medium and heavy commercial vehicles, integrated electric drive axle systems have gradually become the mainstream drive form for the new generation of medium and heavy commercial vehicles. However, current electric drive axles have problems such as low transmission efficiency, large weight, complex transmission structures, and high costs.

[0003] Therefore, it is necessary to study an electric drive axle provided with a three-speed transmission mechanism to solve one or more of the above technical problems. Summary of the Invention

[0004] To solve at least one of the above technical problems, according to one aspect of the present invention, there is provided an electric drive axle provided with a three-speed transmission mechanism, which is characterized by comprising:

[0005] A power input device for inputting the power of the motor into the three-speed transmission mechanism;

[0006] A three-speed transmission mechanism for receiving the power of the power input device and transmitting the power to the power output device; and

[0007] A power output device for outputting the power to the left and right wheels;

[0008] Wherein, the three-speed transmission mechanism comprises:

[0009] A central shaft fixedly connected with a first power input gear and a first output engaging tooth, and used for transmitting the power of the first power input gear to the first output engaging tooth;

[0010] A transmission shaft rotatably sleeved outside the central shaft, with one end fixedly connected to the box body and the other end fixedly connected to the sun gear of a double-star planetary gear set;

[0011] A second power input gear connected to the planet carrier of the double-star planetary gear set and used for transmitting the power to the planet carrier;

[0012] A second output engaging tooth for receiving the power from the planet carrier;

[0013] A third output engaging tooth for receiving the power from the ring gear of the double-star planetary gear set; and

[0014] An engaging tooth sleeve for selectively transmitting the power of the first output engaging tooth, the second output engaging tooth, or the third output engaging tooth to the power output device.

[0015] According to another aspect of the present invention, the power output device includes a differential, which receives power from the engaging sleeve through a differential housing and transmits the power to a first output half shaft and a second output half shaft.

[0016] According to another aspect of the present invention, the power output device further includes a reduction planetary gear set, which is configured to receive power from the engaging sleeve and transmit the power to the differential.

[0017] According to another aspect of the present invention, the power input device includes a first transmission gear and a second transmission gear, and power is respectively transmitted to a first power input gear and a second power input gear via the first transmission gear and the second transmission gear.

[0018] According to another aspect of the present invention, the power input device further includes a connecting shaft, and the first transmission gear and the second transmission gear are fixedly connected to the connecting shaft.

[0019] According to another aspect of the present invention, the power input device further includes a motor and a third transmission gear, the motor is used to drive the third transmission gear, and the third transmission gear is used to transmit power to the connecting shaft.

[0020] According to another aspect of the present invention, the central shaft is a hollow shaft, and the first output half shaft passes through the central shaft.

[0021] According to another aspect of the present invention, the third transmission gear meshes with the first transmission gear or the second transmission gear, or the third transmission gear meshes with a fourth transmission gear provided on a transmission shaft.

[0022] According to another aspect of the present invention, the second power input gear is fixedly connected to the outer periphery of the planet carrier.

[0023] According to another aspect of the present invention, the first power input gear and the second power input gear are arranged on a first side of a double-star planetary gear set, and a first output engaging tooth, a second output engaging tooth and a third output engaging tooth are arranged on a second side of the double-star planetary gear set.

[0024] The present invention can achieve one or more of the following technical effects:

[0025] 1. The cooperation between the motor and the double-star planetary gear set improves the utilization rate of the motor power;

[0026] 2. The adoption of the second pair of gear pair structure in cooperation with the original two-speed shift motor and its actuator realizes the third speed, and the speed step ratio between the second speed and the third speed can be made appropriate, the shift is smoother, and the driving control comfort is improved;

[0027] 3. The load-bearing capacity can be effectively improved, and the system is more compact. Description of the Drawings

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Figure 1 It is a schematic diagram of an electric drive axle provided with a three-speed transmission mechanism according to a preferred embodiment of the present invention.

[0030] Figures 2-4 It is a schematic diagram of the power transmission route of an electric drive axle provided with a three-speed transmission mechanism according to a preferred embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of an electric drive axle provided with a three-speed transmission mechanism according to another preferred embodiment of the present invention. Specific Embodiments

[0032] The following describes the best mode of the present invention through preferred embodiments in conjunction with the accompanying drawings. The specific embodiments herein are to explain the present invention in detail and should not be construed as a limitation to the present invention. Various modifications and alterations can be made without departing from the spirit and scope of the present invention, and all of them should be included within the protection scope of the present invention.

[0033] Embodiment 1

[0034] According to a preferred embodiment of the present invention, refer to Figures 1-5 , there is provided an electric drive axle provided with a three-speed transmission mechanism, which is characterized by including:

[0035] A power input device for inputting the power of the motor M1 into the three-speed transmission mechanism;

[0036] A three-speed transmission mechanism for receiving the power from the power input device and transmitting the power to the power output device; and

[0037] A power output device for outputting the power to the left and right wheels.

[0038] Among them, the three-speed transmission mechanism includes:

[0039] A central shaft 11, fixedly connected with a first power input gear 10 and a first output engaging tooth 12, and used for transmitting the power of the first power input gear 10 to the first output engaging tooth 12;

[0040] A transmission shaft 35, rotatably sleeved outside the central shaft 11, and one end fixedly connected to the box body 4, and the other end fixedly connected to the sun gear 19 of the double-star planetary gear set;

[0041] A second power input gear 14, connected to the planet carrier 15 of the double-star planetary gear set and used for transmitting the power to the planet carrier 15;

[0042] A second output engaging tooth 16 for receiving power from the planet carrier 14;

[0043] A third output engaging tooth 21 for receiving power from the ring gear 20 of the double-star planetary gear set; and

[0044] An engaging sleeve 22 for selectively transmitting the power of the first output engaging tooth 12, the second output engaging tooth 16 or the third output engaging tooth 21 to the power output device.

[0045] According to another preferred embodiment of the present invention, referring to Figure 5 , the power output device includes a differential 32 which receives power from the engaging sleeve 22 through a differential housing 31 and transmits the power to a first output half shaft 34 and a second output half shaft 33.

[0046] According to another preferred embodiment of the present invention, referring to Figure 1 , the power output device further includes a reduction planetary gear set which is used to receive power from the engaging sleeve 22 and transmit the power to the differential 32.

[0047] According to another preferred embodiment of the present invention, the power input device includes a first transmission gear 9 and a second transmission gear 13, and power is respectively transmitted to a first power input gear 10 and a second power input gear 14 via the first transmission gear 9 and the second transmission gear 13.

[0048] According to another preferred embodiment of the present invention, the power input device further includes a connecting shaft 8, and the first transmission gear 9 and the second transmission gear 13 are fixedly connected to the connecting shaft 8.

[0049] According to another preferred embodiment of the present invention, the power input device further includes a motor M1 and a third transmission gear 6. The motor is used to drive the third transmission gear 6, and the third transmission gear 6 is used to transmit power to the connecting shaft 8.

[0050] According to another preferred embodiment of the present invention, the central shaft 11 is a hollow shaft, and the first output half shaft 34 passes through the central shaft 11.

[0051] According to another preferred embodiment of the present invention, the third transmission gear 6 meshes with the first transmission gear 9 or the second transmission gear 13, or the third transmission gear 6 meshes with a fourth transmission gear 7 provided on the transmission shaft 8.

[0052] According to another preferred embodiment of the present invention, the second power input gear 14 is fixedly connected to the outer periphery of the planet carrier 15.

[0053] According to another preferred embodiment of the present invention, the first power input gear 10 and the second power input gear 14 are arranged on the first side of the double-star planetary gear set, and the first output engaging tooth 12, the second output engaging tooth 16 and the third output engaging tooth 21 are arranged on the second side of the double-star planetary gear set.

[0054] According to another preferred embodiment of the present invention, the motor M1 is connected to the gear 6 through the motor shaft 5. The gear 6 meshes with the gear 7. The gear 7 is rigidly connected to the transmission shaft 8, the gear 9 and the gear 13. The gear 9 meshes with the gear 10. The gear 10 is rigidly connected to the shaft 11 and the output engaging tooth 12. The gear 13 meshes with the gear 14. The gear 14 is rigidly connected to the planet carrier 15 and the output engaging tooth 16. The inner planet gear 17 and the outer planet gear 18 revolve around the central axis of the planet carrier 15 and rotate around their own gear axes under the constraint of the planet carrier 15. The inner planet gear 17 meshes with the sun gear 19. The sun gear 19 is fixed to the housing 4. The inner planet gear 17 meshes with the outer planet gear 18. The outer planet gear 18 meshes with the internal gear ring 20. The internal gear ring 20 is rigidly connected to the output engaging tooth 21. The engaging tooth sleeve 22 is connected to the shift fork 23. The shift fork 23 is fixed on the shift transmission rod 24. At the same time, the shift fork 23 is radially fixed to the spline sleeve 26 and axially relatively slides. The shift motor 25 drives the shift transmission rod 24 to slide left and right for shifting. The output engaging tooth 21, the output engaging tooth 16 and the output engaging tooth 12 are distributed on both sides of the engaging tooth sleeve 22, serving as the first position, the second position and the third position of the shift gear respectively. The spline sleeve 26 is coaxially and rigidly connected to the sun gear 27. The sun gear 27 meshes with the planet gear 28. The planet gear 28 meshes with the internal gear ring 29. The internal gear ring 29 is fixed to the housing 4. The planet gear 28 revolves around the central axis of the planet carrier 30 and rotates around its own planet gear axis under the constraint of the planet carrier 30. The planet carrier 30 is rigidly connected to the differential case 31. The differential case 31 drives the differential 32. The differential 32 transmits the power to the first half shaft 33 and the second half shaft 34 and then to the wheel ends.

[0055] Preferably, the sun gear 19 of the double-star planetary gear set is connected to the housing 4 via the shaft 35. The second output engaging tooth 16 is connected to the planet carrier 15 of the double-star planetary gear set via the shaft 36. The third output engaging tooth 21 is connected to the gear ring 20 of the double-star planetary gear set via the shaft 37.

[0056] The working principle of the present invention is as follows.

[0057] First gear (low speed gear): Engage Figure 2, the output torque of the motor M1 is transmitted through the motor shaft 5 to the gear 6. The gear 6 meshes with the gear 7, and the gear 7 is rigidly connected to the gear 13. The gear 13 transmits power to the gear 14 through gear meshing connection. The gear 14 is rigidly connected to the planet carrier 15. The shift motor 25 drives the shift transmission rod 24, and the shift drive rod 24 drives the shift fork 23 and the engaging sleeve 22 to slide axially along the spline sleeve 26. The engaging sleeve 22 engages with the output engaging teeth 21 to reach the first gear position. The internal gear ring 20 is rigidly connected to the output engaging teeth 21, the sun gear 19 is fixed, and the planet carrier 15 drives the internal planet gear 17 and the external planet gear 18 to rotate around the central axis. The internal planet gear 17 meshes with the sun gear 19, the external planet gear 18 meshes with the internal planet gear 17, and the external planet gear 18 meshes with the internal gear ring 20. At this time, the planetary gear train structure composed of the planet carrier 15, the internal planet gear 17, the external planet gear 18, and the internal gear ring 20 is in a speed reduction transmission state. The internal gear ring 20 is rigidly connected to the spline sleeve 26 and the sun gear 27. The sun gear 27 meshes with the planet gear 28, the planet gear 28 meshes with the internal gear ring 29, the internal gear ring 29 is fixed, and the planet gear 28 drives the planet carrier 30 to rotate around the central axis. The planet carrier 30 is rigidly connected to the differential case 31, and the power is transmitted to the first output half shaft 33 and the second output half shaft 34 respectively through the differential 32, and finally output to the wheel ends.

[0058] Second gear (medium speed gear): Engage Figure 3 , the output torque of the motor M1 is transmitted through the motor shaft 5 to the gear 6. The gear 6 meshes with the gear 7, and the gear 7 is rigidly connected to the gear 13. The gear 13 transmits power to the gear 14 through gear meshing connection. The gear 14 is rigidly connected to the planet carrier 15. The shift motor 25 drives the shift transmission rod 24, and the shift drive rod 24 drives the shift fork 23 and the engaging sleeve 22 to slide axially along the spline sleeve 26. The engaging sleeve 22 engages with the output engaging teeth 16 to reach the second gear position, making the sun gear 19 fixed. The planet carrier 15 drives the internal planet gear 17 and the external planet gear 18 to rotate around the central axis. At this time, the planetary gear train structure composed of the planet carrier 15, the internal planet gear 17, and the external planet gear 18 is in a direct drive state. The planet carrier 15, the spline sleeve 26, and the sun gear 27 are rigidly connected. The sun gear 27 meshes with the planet gear 28, the planet gear 28 meshes with the internal gear ring 29, the internal gear ring 29 is fixed, and the planet gear 28 drives the planet carrier 30 to rotate around the central axis. The planet carrier 30 is rigidly connected to the differential case 31, and the power is transmitted to the first output half shaft 33 and the second output half shaft 34 respectively through the differential 32, and finally output to the wheel ends.

[0059] Third gear (high speed gear): Engage Figure 4, the output torque of the motor M1 is transmitted through the motor shaft 5 to the gear 6. The gear 6 meshes with the gear 7, and the gear 7 is rigidly connected to the gear 9. The gear 9 transmits power to the gear 10 through gear meshing connection. The gear 10 is rigidly connected to the output engaging tooth 12. The shift motor 25 drives the shift transmission rod 24, and the shift drive rod 24 drives the shift fork 23 and the engaging sleeve 22 to slide axially along the spline sleeve 26. The engaging sleeve 22 engages with the output engaging tooth 12 to reach the third gear position. The gear 10, the spline sleeve 26 and the sun gear 27 are rigidly connected. The sun gear 27 meshes with the planet gear 28, and the planet gear 28 meshes with the internal gear ring 29. The internal gear ring 29 is fixed, and the planet gear 28 drives the planet carrier 30 to rotate around the central axis. The planet carrier 30 is rigidly connected to the differential case 31, and the power is transmitted to the first output half shaft 33 and the second output half shaft 34 respectively through the differential 32, and finally output to the wheel side.

[0060] The present invention can achieve one or more of the following technical effects:

[0061] 1. The cooperation between the motor and the double-star planetary row improves the utilization rate of the motor power;

[0062] 2. The adoption of the second pair of gear pair structure in cooperation with the original two-speed shift motor and its actuator realizes the third gear, and the speed step ratio between the second gear and the third gear can be made moderate, the shifting is smoother, and the driving control comfort is improved;

[0063] 3. The bearing capacity can be effectively improved, and the system is more compact.

[0064] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric drive axle provided with a three-speed transmission mechanism, characterized in that it includes: A power input device for inputting the power of the motor into the three-speed transmission mechanism; A three-speed transmission mechanism for receiving the power of the power input device and transmitting the power to the power output device; And A power output device for outputting power to the left and right wheels; Wherein, the three-speed transmission mechanism includes: A central shaft fixedly connected with a first power input gear and a first output engaging tooth, and used for transmitting the power of the first power input gear to the first output engaging tooth; A transmission shaft rotatably sleeved outside the central shaft, with one end fixedly connected to the box body and the other end fixedly connected to the sun gear of the double-star planetary gear set; A second power input gear connected to the planet carrier of the double-star planetary gear set and used for transmitting power to the planet carrier; A second output engaging tooth for receiving the power from the planet carrier; A third output engaging tooth for receiving the power from the ring gear of the double-star planetary gear set; and An engaging tooth sleeve for selectively transmitting the power of the first output engaging tooth, the second output engaging tooth or the third output engaging tooth to the power output device; Wherein, the power input device includes a first transmission gear and a second transmission gear, and transmits the power to the first power input gear and the second power input gear respectively through the first transmission gear and the second transmission gear; the first power input gear and the second power input gear are arranged on the first side of the double-star planetary gear set, and the first output engaging tooth, the second output engaging tooth and the third output engaging tooth are arranged on the second side of the double-star planetary gear set.

2. The electric drive axle provided with a three-speed transmission mechanism according to claim 1, characterized in that The power output device includes a differential, and the differential receives the power from the engaging tooth sleeve through the differential housing and transmits the power to the first output half shaft and the second output half shaft.

3. The electric drive axle provided with a three-speed transmission mechanism according to claim 2, characterized in that The power output device further includes a reduction planetary gear set, and the reduction planetary gear set is used for receiving the power from the engaging tooth sleeve and transmitting the power to the differential.

4. The electric drive axle provided with a three-speed transmission mechanism according to any one of claims 1-3, characterized in that The power input device further includes a connecting shaft, and the first transmission gear and the second transmission gear are fixedly connected to the connecting shaft.

5. The electric drive axle provided with a three-speed transmission mechanism according to claim 4, characterized in that The power input device further includes a motor and a third transmission gear, the motor is used for driving the third transmission gear, and the third transmission gear is used for transmitting power to the connecting shaft.

6. The electric drive axle provided with a three-speed transmission mechanism according to claim 3, characterized in that The central shaft is a hollow shaft, and the first output half shaft passes through the central shaft.

7. The electric drive axle provided with a three-speed transmission mechanism according to claim 5, characterized in that The third transmission gear meshes with the first transmission gear or the second transmission gear, or the third transmission gear meshes with a fourth transmission gear arranged on the transmission shaft.

8. The electric drive axle provided with a three-speed transmission mechanism according to claim 7, characterized in that The second power input gear is fixedly connected to the outer periphery of the planet carrier.

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