Electric drive axle and vehicle

Abstract

The invention relates to the technical field of vehicles, and particularly discloses an electric drive axle and a vehicle, the electric drive axle comprises a first motor, a second motor, a first planet row, a second planet row, a gear shifting assembly and a differential mechanism, the first planet row and the second planet row are connected in series, the first motor is used for driving the first planet row, and the second motor is used for driving the second planet row; the gear shifting assembly is used for enabling a second sun gear of the second planet row to be connected with a second motor and fixedly connected with a second planet carrier of the second planet row or fixed to the shell, an output shaft of the second planet row is connected with the differential mechanism, the differential mechanism is connected with the two wheels through two half shafts, and the first planet row, the second planet row and the half shafts are coaxially arranged. When the gear shifting assembly is arranged and the second sun gear is connected with the second motor, the electric drive axle is driven by the double motors to obtain higher power, and when the second sun gear is connected with the second planet carrier or the shell, the electric drive axle is driven by the first motor to obtain higher speed and is driven by the single motor at the same time, and more energy is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to an electric drive axle and a vehicle. Background Art

[0002] Electric drive axles are usually driven by two motors, and a multi-speed transmission is set up to meet the vehicle's driving needs under low-torque and high-speed conditions. Existing transmissions are usually set up as parallel shaft structures. Due to the different distribution of gears, it is easy to cause center of gravity offset. In this regard, related technologies provide transmissions with planetary gear structures to solve the problem of center of gravity offset. However, when two motors drive the planetary gear transmission at the same time, in order to ensure stable and efficient operation, the control requirements for the two motors are high, and because two motors are driven at the same time, the maximum speed and maximum torque that can be achieved are limited, and the applicable working conditions are limited. Summary of the Invention

[0003] The purpose of the present invention is to provide an electric drive axle and a vehicle that realizes single-motor and dual-motor switching, while being able to increase the maximum speed and maximum torque to adapt to a wider range of working conditions.

[0004] The present invention provides an electric drive axle, comprising:

[0005] a first motor and a second motor;

[0006] a first planetary row and a second planetary row, wherein the first planetary row and the second planetary row are connected in series, the first motor is used to drive the first planetary row, and the second motor is used to drive the second planetary row;

[0007] a shift assembly, the shift assembly being used to connect the second sun gear of the second planetary gear set to the second motor and to be fixed to the second planetary carrier of the second planetary gear set or to the housing;

[0008] A differential, wherein the output shaft of the second planetary gear set is connected to the differential, the differential is connected to two wheels via two half-shafts, and the first planetary gear set, the second planetary gear set and the half-shafts are coaxially arranged.

[0009] As a preferred technical solution for the electric drive axle, the first planet carrier of the first planetary gear set is fixedly connected to the second ring gear of the second planetary gear set.

[0010] As a preferred technical solution for the electric drive axle, the output shaft of the first motor is fixedly connected to the first sun gear of the first planetary gear set, and the first ring gear of the first planetary gear set is fixed to the housing.

[0011] As an optimal technical solution for the electric drive axle, the shift assembly includes a clutch, a first combining tooth, a second combining tooth and a third combining tooth. The second motor and the second sun gear are connected through the clutch. The first combining tooth is fixedly connected to the second sun gear. The second combining tooth is fixedly connected to the second planetary carrier. The third combining tooth is fixedly connected to the housing. The first combining tooth can idle, engage with the second combining tooth or engage with the third combining tooth.

[0012] As a preferred technical solution of the electric drive axle, the output shaft of the second planetary gear set is the second planetary carrier, and the second planetary carrier is fixedly connected to the input gear of the differential.

[0013] As a preferred technical solution of the electric drive axle, the electric drive axle includes first gear, second gear and third gear;

[0014] When the electric drive axle is in first gear, the clutch is engaged, the first engaging tooth is idling, the first motor drives the first sun gear, and the second motor drives the second sun gear;

[0015] When the electric drive axle is in the second gear, the clutch is disengaged, the first coupling tooth is engaged with the second coupling tooth, and the first motor drives the first sun gear;

[0016] When the electric drive axle is in the third gear, the clutch is disengaged, the first coupling tooth is engaged with the third coupling tooth, and the first motor drives the first sun gear.

[0017] As a preferred technical solution of the electric drive axle, it also includes a power take-off assembly, and the output shaft of the second planetary gear is connected to the power take-off input shaft of the power take-off assembly.

[0018] As a preferred technical solution for the electric drive axle, the power take-off input shaft and the power take-off output shaft of the power take-off assembly are both parallel to the half-shaft.

[0019] As an optimal technical solution for the electric drive axle, the power take-off input shaft is fixedly connected to a driving gear, and the power take-off output shaft is rotatably connected to a driven gear. The driving gear is engaged with the driven gear, and the driven gear is provided with meshing teeth. A gear sleeve is also provided on the power take-off output shaft. The gear sleeve can slide on the power take-off output shaft and engage or disengage with the meshing teeth. The gear sleeve is used to drive the power take-off output shaft to rotate.

[0020] The present invention provides a vehicle comprising the electric drive axle of any of the above solutions.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides an electric drive axle. By setting a shift assembly, when the second sun gear is connected to the second motor, the electric drive axle is driven by two motors, thereby obtaining greater power. When the second sun gear is connected to the second planetary carrier or housing, the electric drive axle is driven by the first motor, thereby obtaining a higher speed while using a single motor drive, which is more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the electric drive axle in an embodiment of the present invention.

[0024] In the picture:

[0025] 10. First motor; 20. Second motor;

[0026] 11. Clutch; 12. First engaging tooth; 13. Second engaging tooth; 14. Third engaging tooth;

[0027] 21. First sun gear; 22. First planet gear; 23. First planet carrier; 24. First ring gear;

[0028] 31. Second sun gear; 32. Second planet gear; 33. Second planet carrier; 34. Second ring gear;

[0029] 41. Input gear; 42. Power take-off gear;

[0030] 51. Differential; 52. Axle shaft; 53. Wheel;

[0031] 61. Driving gear; 62. Driven gear; 621. Meshing teeth; 63. Gear sleeve; 64. Power take-off output shaft. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] like Figure 1As shown, this embodiment provides an electric drive axle comprising a first motor 10, a second motor 20, a first planetary gear set, a second planetary gear set, a shift assembly, and a differential 51. The first and second planetary gear sets are connected in series. In this embodiment, the second planetary gear set serves as the power output. The corresponding connection between the first and second planetary gear sets can be achieved by fixedly connecting the first planetary gear set's first planetary carrier 23 to the second planetary gear set's second ring gear 34, or by fixedly connecting the first planetary gear set's first ring gear 24 to the second planetary gear set's second planetary carrier 33. In this embodiment, the first planetary gear set's first planetary carrier 23 is fixedly connected to the second planetary gear set's second ring gear 34. The second planetary gear set's second planetary carrier 33 serves as the output shaft for the second planetary gear set to output power outwards. The second planetary gear set 33 is fixedly connected to the input gear 41 of the differential 51. The first motor 10 drives the first planetary gear set, and the second motor 20 drives the second planetary gear set. The shift assembly connects the second planetary gear set's sun gear to the second motor 20 and is fixedly connected to or secured to the housing with the second planetary gear set's second planetary carrier 33. The output shaft of the second planetary gear set, or second planetary carrier 33, is connected to the differential 51. The differential 51 is connected to two wheels 53 via two half-shafts 52. The first and second planetary gear sets, along with the half-shafts 52, are coaxially arranged. By providing a shift assembly, when the second sun gear 31 is connected to the second motor 20, the electric drive axle utilizes dual motor drive, achieving greater power. When the second sun gear 31 is connected to the second planetary carrier 33 or the housing, the electric drive axle is driven by the first motor 10, achieving higher speeds while utilizing a single motor for greater energy efficiency.

[0037] Furthermore, the output shaft of the first motor 10 is fixedly connected to the first sun gear 21 of the first planetary row and is used to drive the first sun gear 21 to rotate. The first ring gear 24 of the first planetary row is fixed on the housing, that is, the first planetary row uses the first sun gear 21 as input and the first planetary carrier 23 as output, thereby reducing speed and increasing torque.

[0038] Specifically, the shift assembly includes a clutch 11, a first combining tooth 12, a second combining tooth 13 and a third combining tooth 14. The second motor 20 and the second sun gear 31 are connected through the clutch 11. When the clutch 11 is engaged, the power of the second motor 20 can be transmitted to the second sun gear 31. When the clutch 11 is disengaged, the second motor 20 and the second sun gear 31 are disconnected. The first combining tooth 12 is fixedly connected to the second sun gear 31, the second combining tooth 13 is fixedly connected to the second planetary carrier 33, and the third combining tooth 14 is fixedly connected to the housing. The first combining tooth 12 can idling, meshing with the second combining tooth 13 or meshing with the third combining tooth 14. The first combining tooth 12 can idling, meshing with the second combining tooth 13 or meshing with the third combining tooth 14 by means of a sliding sleeve in the prior art. The specific structure is not described here.

[0039] Specifically, the electric drive axle includes first, second, and third gears. When the electric drive axle is in first gear, the clutch 11 is engaged, the first coupling gear 12 idles, the first motor 10 drives the first sun gear 21, and the second motor 20 drives the second sun gear 31, creating a dual-motor drive system. The power of the first motor 10 is decelerated by the first planetary gear set and input into the ring gear of the second planetary gear set. The power of the second motor 20 enters the sun gear of the second planetary gear set through the clutch 11. After power coupling, the two are output through the second planetary gear set through the second planetary carrier 33, thereby increasing output power and meeting the vehicle's high-power requirements. For heavy-load starting or unstuck conditions, the speeds of the first motor 10 and the second motor 20 are adjusted so that the speed of the second motor 20 driving the second sun gear 31 is greater than the speed of the first motor 10 driving the second ring gear 34 after deceleration by the first planetary gear set. This achieves torque reduction and torque increase in the second planetary gear set after the coupled power is decelerated. In this case, the greater the speed difference between the second sun gear 31 and the second ring gear 34, that is, the faster the second sun gear 31 rotates, the more obvious the deceleration and torque increase effect of the second planetary gear set. For fully loaded and high-speed driving conditions, the vehicle still requires higher power. At this time, the speed of the second motor 20 driving the second sun gear 31 can be made lower than the speed of the first motor 10 driving the second ring gear 34 after deceleration by the first planetary gear set, thereby achieving the speed increase of the coupled power in the second planetary gear set. Similarly, the slower the speed of the second sun gear 31, the more obvious the speed increase effect of the second planetary gear set. The speed regulation method of the first motor 10 and the second motor 20 is determined according to the speed ratio of the first planetary gear set and the second planetary gear set, and no specific examples are given here.

[0040] When the electric drive axle is in second gear, clutch 11 is disengaged, first coupling teeth 12 mesh with second coupling teeth 13, and first motor 10 drives first sun gear 21, resulting in single-motor drive. When first coupling teeth 12 and second coupling teeth 13 mesh, second coupling teeth 13 are fixedly connected to second planetary carrier 33, causing second sun gear 31 and second planetary carrier 33 to rotate at the same speed. At this point, the speed ratio of the second planetary gear set is 1. The power from first planetary carrier 23 is directly output through second planetary carrier 33, meaning the power from first motor 10 is decelerated by the first planetary gear set before being output. Compared to first gear, this reduces power output while maintaining a balance between speed and torque, making it suitable for low- and medium-speed driving on urban roads and saving energy.

[0041] When the electric drive axle is in third gear, the clutch 11 is disengaged, the first coupling teeth 12 mesh with the third coupling teeth 14, and the first motor 10 drives the first sun gear 21, thus achieving single-motor drive. When the first coupling teeth 12 mesh with the third coupling teeth 14, the first sun gear 21 cannot rotate because the third coupling teeth 14 are fixed to the housing. At this point, the first planetary carrier 23 of the first planetary gear set transmits power to the second ring gear 34 of the second planetary gear set. Since the second sun gear 31 cannot rotate, the first planetary carrier 23 transmits power to the second ring gear 34. At this point, the second planetary gear set operates as a speed-increasing transmission, meaning the power of the first motor 10 is first decelerated by the first planetary gear set and then accelerated by the second planetary gear set. By setting the transmission ratio between the first and second planetary gear sets, the speed output by the second planetary carrier 33 can be greater than the speed output by the second motor 20, meeting the requirements for high-speed driving when the vehicle is lightly loaded or unloaded, while also saving energy using a single-motor drive.

[0042] The electric drive axle in this embodiment can meet the driving requirements of the vehicle under various working conditions. For example, when the vehicle needs to start with a heavy load or travel at a low speed with a heavy load, the first gear is engaged and the rotation speeds of the first motor 10 and the second motor 20 are adjusted so that the second planetary carrier 33 outputs a large torque. When the vehicle needs to travel at a high speed with a heavy load, the first gear is engaged and the rotation speeds of the first motor 10 and the second motor 20 are adjusted so that the second planetary carrier 33 outputs a high rotation speed. When the vehicle is traveling at medium or low speeds on urban roads, the vehicle's power demand is not high. The second gear can be engaged and only the first motor 10 can be used for driving to save energy. When the vehicle is traveling at a high speed with a light load or no load, the third gear can be engaged and only the first motor 10 can be used for driving. The requirements of high-speed driving can be met, further saving energy. For other usage scenarios, they can be selected according to actual needs and will not be described in detail here.

[0043] Furthermore, the electric drive axle also includes a power take-off assembly, and the output shaft of the second planetary gear set is connected to the power take-off input shaft of the power take-off assembly. The power take-off input shaft and the power take-off output shaft of the power take-off assembly are both parallel to the half-shaft 52. The second planetary gear set is fixedly connected to the input gear 41, which drives the differential 51 to rotate and simultaneously engages with the power take-off gear 42. The power take-off gear 42 is connected to the power take-off input shaft, and a driving gear 61 is coaxially connected to the power take-off input shaft with the power take-off gear 42. The power take-off output shaft 64 is rotatably connected to the driven gear 62, and the driving gear 61 engages with the driven gear 62. The driven gear 62 is provided with meshing teeth 621, and the power take-off output shaft 64 is also provided with a gear sleeve 63. The gear sleeve 63 can slide on the power take-off output shaft 64 and engage or disengage with the meshing teeth 621. The gear sleeve 63 is used to drive the power take-off output shaft 64 to rotate. When the power take-off assembly needs to be used, the sliding gear sleeve 63 is engaged with the meshing teeth 621, so that the power is transmitted to the power take-off output shaft 64 through the second planetary carrier 33, the input gear 41, the output gear, the power take-off input shaft, the driving gear 61, the driven gear 62 and the gear sleeve 63 in sequence.

[0044] This embodiment further provides a vehicle, comprising the electric drive axle of this embodiment. Specifically, the vehicle is preferably a commercial vehicle.

[0045] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Electric drive axle, characterized in that: include: a first motor (10) and a second motor (20); a first planetary row and a second planetary row, the first planetary row and the second planetary row being connected in series, the first motor (10) being used to drive the first planetary row, and the second motor (20) being used to drive the second planetary row; a shift assembly, the shift assembly being used to connect the second sun gear (31) of the second planetary gear set to the second motor (20) and to be fixedly connected to or secured to the housing with the second planetary carrier (33) of the second planetary gear set; A differential (51), an output shaft of the second planetary gear is connected to the differential (51), the differential (51) is connected to two wheels (53) via two half-shafts (52), and the first planetary gear, the second planetary gear and the half-shafts (52) are coaxially arranged.

2. The electric drive axle according to claim 1, characterized in that: The first planet carrier (23) of the first planetary gear set is fixedly connected to the second ring gear (34) of the second planetary gear set.

3. The electric drive axle according to claim 2, characterized in that: The output shaft of the first motor (10) is fixedly connected to the first sun gear (21) of the first planetary gear set, and the first ring gear (24) of the first planetary gear set is fixed on the housing.

4. The electric drive axle according to claim 3, characterized in that: The shift assembly comprises a clutch (11), a first combining tooth (12), a second combining tooth (13) and a third combining tooth (14); the second motor (20) and the second sun gear (31) are connected via the clutch (11); the first combining tooth (12) is fixedly connected to the second sun gear (31); the second combining tooth (13) is fixedly connected to the second planetary carrier (33); the third combining tooth (14) is fixedly connected to the housing; the first combining tooth (12) can idle, mesh with the second combining tooth (13) or mesh with the third combining tooth (14).

5. The electric drive axle according to claim 4, characterized in that: The output shaft of the second planetary gear is the second planetary carrier (33), and the second planetary carrier (33) is fixedly connected to the input gear (41) of the differential (51).

6. The electric drive axle according to claim 5, characterized in that: The electric drive axle includes first gear, second gear and third gear; When the electric drive axle is in first gear, the clutch (11) is engaged, the first engaging tooth (12) is idling, the first motor (10) drives the first sun gear (21), and the second motor (20) drives the second sun gear (31); When the electric drive axle is in the second gear, the clutch (11) is disengaged, the first coupling tooth (12) is engaged with the second coupling tooth (13), and the first motor (10) drives the first sun gear (21); When the electric drive axle is in third gear, the clutch (11) is disengaged, the first coupling tooth (12) is engaged with the third coupling tooth (14), and the first motor (10) drives the first sun gear (21).

7. The electric drive axle according to any one of claims 1 to 6, characterized in that: It also includes a power take-off assembly, wherein the output shaft of the second planetary gear is connected to the power take-off input shaft of the power take-off assembly.

8. The electric drive axle according to claim 7, characterized in that: The power take-off input shaft and the power take-off output shaft (64) of the power take-off assembly are both parallel to the half shaft (52).

9. The electric drive axle according to claim 7, characterized in that: The power take-off input shaft is fixedly connected with a driving gear (61), and the power take-off output shaft (64) is rotatably connected with a driven gear (62). The driving gear (61) is meshed with the driven gear (62), and the driven gear (62) is provided with meshing teeth (621). A gear sleeve (63) is also provided on the power take-off output shaft (64). The gear sleeve (63) can slide on the power take-off output shaft (64) and mesh with or separate from the meshing teeth (621). The gear sleeve (63) is used to drive the power take-off output shaft (64) to rotate.

10. A vehicle, characterized in that The electric drive axle comprises the electric drive axle according to any one of claims 1 to 9.

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