Two-gear speed reducer, electric drive device and electric drive axle assembly

Abstract

The utility model relates to a two-gear speed reducer, an electric drive device and an electric drive axle assembly, the two-gear speed reducer comprises a first-stage planetary speed reducing mechanism, a second-stage planetary speed reducing mechanism, a third-stage planetary speed reducing mechanism, a fourth-stage planetary speed reducing mechanism, a fifth-stage planetary speed reducing mechanism and a fifth-stage planetary speed reducing mechanism, the second-stage gear ring is coaxially arranged outside the first-stage gear ring in a surrounding mode and can rotate around the axis of the second-stage gear ring, and the second-stage gear ring is selectively connected with the first-stage planet carrier or the axle housing through a gear shifting mechanism so as to limit relative rotation of the second-stage gear ring and the first-stage planet carrier or the axle housing; the transmission mechanism is connected with the first-stage gear ring and the second-stage gear ring, when the first-stage gear ring rotates, power is transmitted to the second-stage gear ring in a decelerated mode through the transmission mechanism, the rotation direction of the first-stage gear ring is opposite to that of the second-stage gear ring, and when the second-stage gear ring is fixedly connected with the axle housing through the gear shifting mechanism, the second-stage gear ring limits rotation of the first-stage gear ring through the transmission mechanism. Power output by the power source can be output in a speed reduction mode at two different speed reduction ratios, namely power output of two gears is achieved, and meanwhile the requirements for low-speed large torque and high vehicle speed of a vehicle are met.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive systems, and particularly relates to a two-speed reducer, an electric drive device and an electric drive axle assembly. Background Art

[0002] An electric drive axle belongs to a type of drive axle. The electric drive axle integrates a motor onto the axle to achieve functions such as integration and high efficiency. With the development of new energy vehicles, the technology of electric drive axles is also developing rapidly.

[0003] The transmission system of an electric drive axle is an important part of the electric drive axle. It reduces the speed and increases the torque of the power from the motor and then outputs it, enabling the electric drive axle to have sufficient traction and high efficiency. In related technologies, the transmission system of an electric drive axle mostly uses a reducer with a fixed reduction ratio, which can basically meet general driving requirements. However, a reducer with a fixed reduction ratio cannot meet the requirements of both low-speed high torque and high vehicle speed at the same time. Summary of the Utility Model

[0004] Based on the above description, the utility model provides a two-speed reducer, an electric drive device and an electric drive axle assembly to solve the problem that a reducer with a fixed reduction ratio cannot meet the requirements of both low-speed high torque and high vehicle speed at the same time.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] In the first aspect, the present application provides a two-speed reducer, and the technical solution adopted is as follows:

[0007] A first-stage planetary reduction mechanism, which is used to be connected to the axle housing and includes a first-stage sun gear, first-stage planet gears, a first-stage planet carrier and a first-stage ring gear. The first-stage sun gear is used to connect to a power source. The first-stage ring gear coaxially surrounds the first-stage sun gear and can rotate relative to the axle housing around its own axis. The first-stage planet carrier can rotate relative to the axle housing around the axis of the first-stage sun gear. The first-stage planet gears are located between the first-stage sun gear and the first-stage ring gear and are connected to the first-stage planet carrier. The first-stage planet gears mesh with the first-stage sun gear and the first-stage ring gear. The first-stage planet gears can rotate around their own axes and rotate with the first-stage planet carrier. The first-stage planet carrier is used to be connected to a half shaft and the rotation axis is coaxial with the half shaft to transmit power to the half shaft when rotating;

[0008] A second-stage ring gear, which is used to be connected to the axle housing. The second-stage ring gear coaxially surrounds the first-stage ring gear and can rotate relative to the axle housing around its own axis. The second-stage ring gear can be selectively connected to the first-stage planet carrier or the axle housing through a shifting mechanism to limit the relative rotation between the second-stage ring gear and the first-stage planet carrier or the axle housing;

[0009] A transmission mechanism connects the first-stage gear ring and the second-stage gear ring. When the first-stage gear ring rotates, the power is decelerated and transmitted to the second-stage gear ring through the transmission mechanism, and the rotation directions of the first-stage gear ring and the second-stage gear ring are opposite. When the second-stage gear ring is fixedly connected to the axle housing through a shifting mechanism, the second-stage gear ring restricts the rotation of the first-stage gear ring through the transmission mechanism.

[0010] Preferably, the transmission mechanism includes:

[0011] A second-stage sun gear is disposed between the second-stage gear ring and the first-stage gear ring and is coaxially and fixedly connected to the first-stage gear ring;

[0012] Second-stage planet gears are disposed between the second-stage sun gear and the second-stage gear ring and mesh with the second-stage sun gear and the second-stage gear ring;

[0013] A second-stage planet carrier is fixed to the axle housing, and the second-stage planet gears are connected to the second-stage planet carrier and can rotate about their own axes.

[0014] Preferably, the second-stage gear ring can be selectively connected to the first-stage planet carrier or the second-stage planet carrier through a shifting mechanism to restrict the relative rotation between the second-stage gear ring and the first-stage planet carrier or the second-stage planet carrier.

[0015] Preferably, the shifting mechanism includes:

[0016] A first fixed engaging sleeve is coaxial with the first-stage sun gear and is fixed to the first-stage planet carrier;

[0017] A second fixed engaging sleeve is coaxial with the first-stage sun gear and is fixed to the axle housing;

[0018] A sliding engaging sleeve is coaxial with the second-stage gear ring and is connected to the second-stage gear ring through splines. The sliding engaging sleeve can move axially relative to the axle housing, and the sliding engaging sleeve can move to engage with the first fixed engaging sleeve or the second fixed engaging sleeve.

[0019] Preferably, the sliding engaging sleeve can move to disengage from the first fixed engaging sleeve and the second fixed engaging sleeve.

[0020] In a second aspect, the present application provides an electric drive device, including:

[0021] A two-speed reducer as described above;

[0022] An electric motor, the output shaft of which is coaxially and fixedly connected to the first-stage sun gear.

[0023] In a third aspect, the present application provides an electric drive axle assembly, including:

[0024] An axle housing;

[0025] Two electric drive devices as described above are provided inside the axle housing;

[0026] Two half shafts arranged coaxially, the half shafts are rotatably connected to the axle housing, the two half shafts are respectively connected to the first-stage planet carriers of the two electric drive devices, and the rotation axes of the half shafts and the first-stage planet carriers are coaxial. When the first-stage planet carrier rotates, the power output by the motor is transmitted to the half shaft, and the half shaft is used to be connected to a wheel to drive the wheel to rotate.

[0027] Preferably, one end of the half shaft is fixed to the first-stage planet carrier, and the other end is connected to the wheel through a wheel side reducer.

[0028] Preferably, the wheel side reducer is a constant speed ratio reducer.

[0029] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects:

[0030] 1. For the two-speed reducer of the present application, when the second-stage gear ring is connected to the first-stage planet carrier through the shifting mechanism, the second-stage gear ring and the first-stage planet carrier rotate synchronously. The power source outputs power and is transmitted to the first-stage sun gear. The first-stage sun gear drives the first-stage planet gear to rotate self. The first-stage planet gear drives the first-stage gear ring to rotate. When the first-stage gear ring rotates, the power is decelerated and transmitted to the second-stage gear ring through the transmission mechanism. The second-stage gear ring drives the first-stage planet carrier to rotate, and the power is output to the half shaft through the first-stage planet carrier. The power is output after being decelerated by two levels of the first-stage planetary reduction mechanism and the transmission mechanism, and the rotation directions of the first-stage gear ring and the second-stage gear ring are opposite, so that the rotation speed of the first-stage planet carrier is reduced, realizing a gear with low speed and large torque, that is, the low-speed gear. When the second-stage gear ring is connected to the axle housing through the shifting mechanism, the rotation of the second-stage gear ring is restricted. At the same time, the rotation of the first-stage gear ring is restricted through the transmission mechanism. The power source outputs power and is output through the first-stage sun gear. Under the drive of the first-stage sun gear and the limit of the first-stage gear ring, the first-stage planet gear rotates self and revolves around the first-stage sun gear at the same time, driving the first-stage planet carrier to rotate, and the power is output to the half shaft through the first-stage planet carrier. The power is output after being decelerated by one level of the first-stage planetary reduction mechanism, realizing a gear with high speed and low torque, that is, the high-speed gear. The two-speed reducer of the present application can decelerate and output the power output by the power source with two different reduction ratios, that is, realize the power output of two gears, and can simultaneously meet the requirements of the vehicle for low speed and large torque and higher vehicle speed.

[0031] 2. The present application realizes the switching function of two gears by moving the sliding engagement sleeve to engage with the first fixed engagement sleeve or the second fixed engagement sleeve. The sliding engagement sleeve can be moved to disengage from the first fixed engagement sleeve and the second fixed engagement sleeve. At this time, since the first-stage ring gear can rotate freely, the first-stage sun gear outputs power, which is transmitted to the first-stage ring gear through the first-stage planet gears, and then output by the first-stage ring gear and transmitted to the second-stage ring gear through the transmission mechanism. The power cannot be transmitted to the first-stage planet gears and there is no power output, that is, the neutral gear position, meeting the neutral gear requirements of the vehicle. Brief Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of the electric drive axle assembly provided by an embodiment of the present utility model;

[0033] Figure 2 It is a schematic structural diagram of the electric drive device provided by an embodiment of the present utility model.

[0034] Description of the Reference Numerals:

[0035] 1. Axle housing; 2. Motor; 3. Half shaft; 4. Two-speed reducer; 41. First-stage planetary gear reducer; 411. First-stage sun gear; 412. First-stage planet gear; 413. First-stage planet carrier; 414. First-stage ring gear; 42. Second-stage ring gear; 43. Transmission mechanism; 431. Second-stage sun gear; 432. Second-stage planet gear; 433. Second-stage planet carrier; 44. Shifting mechanism; 441. First fixed engagement sleeve; 442. Second fixed engagement sleeve; 443. Sliding engagement sleeve; 5. Wheel side reducer. Detailed Embodiments

[0036] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0038] It will be understood that spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. may be used herein to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the attached drawings is flipped, an element or feature described as "below other elements" or "beneath it" or "under it" will be oriented "above" the other elements or features. Thus, the exemplary terms "below" and "under" may include both upper and lower orientations. Additionally, the device may also have other orientations (such as rotating 90 degrees or other orientations), and the spatial descriptors used herein are accordingly interpreted.

[0039] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is a transfer of electrical signals or data between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0040] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0041] Referring to Figure 1-2 As shown, an embodiment of the present application provides an electric drive axle assembly, which includes a bridge housing 1, two electric drive devices installed in the bridge housing 1, and two half shafts 3. The two half shafts 3 are coaxially arranged and rotatably connected to the bridge housing 1. The two half shafts 3 are respectively used to connect the left and right wheels, and the two electric drive devices are respectively used to drive the two half shafts 3 to rotate.

[0042] Referring to Figure 1-2 As shown, wherein, the electric drive device includes a motor 2 and a two-speed reducer 4. The two-speed reducer 4 connects the output shaft of the motor 2 and the half shaft 3 to reduce the output power of the motor 2 and output it to the half shaft 3, thereby driving the wheel to rotate.

[0043] Referring to Figure 1-2 As shown, specifically, the two-speed reducer 4 includes a first-stage planetary reduction mechanism, a second-stage ring gear 42, and a transmission mechanism 43.

[0044] Referring to Figure 2As shown in the figure, the first-stage planetary reduction mechanism is connected to the axle housing 1 and includes a first-stage sun gear 411, a first-stage planet gear 412, a first-stage planet carrier 413, and a first-stage ring gear 414. The first-stage sun gear 411 is coaxially and fixedly connected to the output shaft of the motor 2. The first-stage ring gear 414 is coaxially surrounded outside the first-stage sun gear 411 and can rotate relative to the axle housing 1 about its own axis. The first-stage planet carrier 413 can rotate relative to the axle housing 1 about the axis of the first-stage sun gear 411. The first-stage planet gear 412 is located between the first-stage sun gear 411 and the first-stage ring gear 414 and is connected to the first-stage planet carrier 413. The first-stage planet gear 412 meshes with the first-stage sun gear 411 and the first-stage ring gear 414. The first-stage planet gear 412 can rotate about its own axis and rotate with the first-stage planet carrier 413. The first-stage planet carrier 413 is fixedly connected to the half shaft 3 and the rotation axis is coaxial with the half shaft 3 to transmit power to the half shaft 3 during rotation.

[0045] Referring to Figure 2 As shown in the figure, the second-stage ring gear 42 is connected to the axle housing 1. The second-stage ring gear 42 is coaxially surrounded outside the first-stage ring gear 414 and can rotate relative to the axle housing 1 about its own axis. The second-stage ring gear 42 can be selectively connected to the first-stage planet carrier 413 or the axle housing 1 through a shifting mechanism to limit the relative rotation between the second-stage ring gear 42 and the first-stage planet carrier 413 or the axle housing 1. When the second-stage ring gear 42 is connected to the first-stage planet carrier 413, the relative rotation between the second-stage ring gear 42 and the first-stage planet carrier 413 is restricted. When the second-stage ring gear 42 is connected to the axle housing 1, the relative rotation between the second-stage ring gear 42 and the axle housing 1 is restricted.

[0046] Referring to Figure 2 As shown in the figure, the transmission mechanism 43 connects the first-stage ring gear 414 and the second-stage ring gear 42. When the first-stage ring gear 414 rotates, it transmits power to the second-stage ring gear 42 after deceleration through the transmission mechanism 43, and the rotation directions of the first-stage ring gear 414 and the second-stage ring gear 42 are opposite. When the second-stage ring gear 42 is fixedly connected to the axle housing 1 through the shifting mechanism, the second-stage ring gear 42 restricts the rotation of the first-stage ring gear 414 through the transmission mechanism 43.

[0047] Referring to Figure 2 As shown in the figure, when the second-stage ring gear 42 is connected to the first-stage planet carrier 413 through the shifting mechanism, the second-stage ring gear 42 and the first-stage planet carrier 413 rotate synchronously. The power source outputs power to the first-stage sun gear 411. The first-stage sun gear 411 drives the first-stage planet gear 412 to rotate self. The first-stage planet gear 412 drives the first-stage ring gear 414 to rotate. When the first-stage ring gear 414 rotates, the power is transmitted to the second-stage ring gear 42 after deceleration through the transmission mechanism 43. The second-stage ring gear 42 drives the first-stage planet carrier 413 to rotate, and the power is output to the half shaft 3 through the first-stage planet carrier 413. The power is output after two-stage deceleration by the first-stage planetary reduction mechanism and the transmission mechanism 43, and the rotation directions of the first-stage ring gear 414 and the second-stage ring gear 42 are opposite, so that the rotation speed of the first-stage planet carrier 413 is reduced, realizing a gear with low speed and large torque, that is, the low-speed gear.

[0048] Refer to Figure 2 As shown, when the secondary gear ring 42 is connected to the axle housing 1 through the shifting mechanism, the rotation of the secondary gear ring 42 is restricted. At the same time, the rotation of the primary gear ring 414 is restricted through the transmission mechanism 43. The power output from the power source is output through the primary sun gear 411. Driven by the primary sun gear 411 and limited by the primary gear ring 414, the primary planet gear 412 rotates around its own axis and revolves around the primary sun gear 411 at the same time, driving the primary planet carrier 413 to rotate. The power is output to the half shaft 3 through the primary planet carrier 413. After being decelerated by the primary planetary reduction mechanism, a gear position with high speed and low torque is achieved, that is, the high-speed gear position. The decelerated output of the power output from the power source in two gear positions can meet the requirements of the vehicle for low speed and high torque and relatively high vehicle speed at the same time.

[0049] Refer to Figure 2 As shown, specifically, to achieve the purpose of the transmission mechanism 43 decelerating and outputting the power output from the primary gear ring 414 to the secondary gear ring 42, the transmission mechanism 43 includes a secondary sun gear 431, secondary planet gears 432 and a secondary planet carrier 433. The secondary sun gear 431 is arranged between the secondary gear ring 42 and the primary gear ring 414 and is coaxially and fixedly connected to the primary gear ring 414; the secondary planet gears 432 are arranged between the secondary sun gear 431 and the secondary gear ring 42 and mesh with the secondary sun gear 431 and the secondary gear ring 42; the secondary planet carrier 433 is fixed on the axle housing 1, and the secondary planet gears 432 are connected to the secondary planet carrier 433 and can rotate around their own axes.

[0050] When the primary gear ring 414 rotates, the power is output to the secondary sun gear 431. The rotation of the secondary sun gear 431 drives the secondary planet gears 432 to rotate and drives the secondary gear ring 42 to rotate, so as to achieve the purpose of decelerating and outputting the power output from the primary gear ring 414 to the secondary gear ring 42.

[0051] In this embodiment, the secondary sun gear 431 coaxially surrounds the primary gear ring 414 and is fixed to the primary gear ring 414.

[0052] Refer to Figure 2 As shown, further, the secondary gear ring 42 can be selectively connected to the primary planet carrier 413 or the secondary planet carrier 433 through the shifting mechanism to restrict the relative rotation between the secondary gear ring 42 and the primary planet carrier 413 or the secondary planet carrier 433. When the secondary gear ring 42 is connected to the secondary planet carrier 433, the relative rotation between the secondary gear ring 42 and the secondary planet carrier 433 is restricted, achieving the purpose of the shifting mechanism 44 connecting the secondary gear ring 42 and the axle housing 1.

[0053] Refer to Figure 2As shown in the figure, the shift mechanism includes a first fixed engaging sleeve 441, a second fixed engaging sleeve 442, and a sliding engaging sleeve 443. The first fixed engaging sleeve 441 is coaxial with the first-stage sun gear 411 and fixed to the first-stage planet carrier 413. The second fixed engaging sleeve 442 is coaxial with the first-stage sun gear 411 and fixed to the second-stage planet carrier 433. The sliding engaging sleeve 443 is coaxial with the second-stage ring gear 42 and connected to the second-stage ring gear 42 through splines. The sliding engaging sleeve 443 can move axially relative to the axle housing 1 and can move to engage with the first fixed engaging sleeve 441 or the second fixed engaging sleeve 442.

[0054] Referring to Figure 2 As shown in the figure, specifically, the first fixed engaging sleeve 441 and the second fixed engaging sleeve 442 are spaced apart axially on the half shaft 3. The sliding engaging sleeve 443 is axially movable on the half shaft 3 and can move to engage with the first fixed engaging sleeve 441 or the second fixed engaging sleeve 442 to achieve the shifting function. And to meet the neutral gear requirement of the vehicle, the sliding engaging sleeve 443 is set to be movable to disengage from the first fixed engaging sleeve 441 and the second fixed engaging sleeve 442. At this time, the power output by the motor 2 cannot be transmitted to the first-stage planet gear 412 after being transmitted to the second-stage ring gear 42, and there is no power output, which is the neutral gear position.

[0055] Specifically, in this embodiment, one end of the half shaft 3 is fixed to the first-stage planet carrier 413, and the other end is connected to the wheel through a wheel side reducer 5. The wheel side reducer 5 adopts a constant speed ratio reducer.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-speed reducer (4), characterized in that: include: A first-stage planetary reduction mechanism is used to be connected to a bridge housing (1), comprising a first-stage sun gear (411), a first-stage planetary gear (412), a first-stage planetary carrier (413) and a first-stage ring gear (414), wherein the first-stage sun gear (411) is used to be connected to a power source, the first-stage ring gear (414) coaxially surrounds the first-stage sun gear (411) and can rotate relative to the bridge housing (1) around its own axis, the first-stage planetary carrier (413) can rotate relative to the bridge housing (1) around the axis of the first-stage sun gear (411), and the first-stage planetary gear (412) can rotate relative to the bridge housing (1) around the axis of the first-stage sun gear (411). 12) is located between the primary sun gear (411) and the primary ring gear (414) and is connected to the primary planet carrier (413), the primary planet gear (412) is meshed with the primary sun gear (411) and the primary ring gear (414), the primary planet gear (412) can rotate around its own axis and rotate with the primary planet carrier (413), the primary planet carrier (413) is used to be connected to the half shaft (3) and the rotating shaft is coaxial with the half shaft (3), so as to transmit power to the half shaft (3) when rotating; A secondary gear ring (42) is used to be connected to the bridge housing (1), the secondary gear ring (42) coaxially surrounds the primary gear ring (414) and can rotate relative to the bridge housing (1) around its own axis, and the secondary gear ring (42) can be selectively connected to the primary planetary carrier (413) or the bridge housing (1) through a shifting mechanism to limit the relative rotation of the secondary gear ring (42) and the primary planetary carrier (413) or the bridge housing (1); A transmission mechanism (43) is provided, which connects the primary ring gear (414) and the secondary ring gear (42); when the primary ring gear (414) rotates, the power is decelerated and transmitted to the secondary ring gear (42) through the transmission mechanism (43); and the primary ring gear (414) and the secondary ring gear (42) rotate in opposite directions; when the secondary ring gear (42) is fixedly connected to the bridge housing (1) through a shifting mechanism, the secondary ring gear (42) limits the rotation of the primary ring gear (414) through the transmission mechanism (43).

2. The two-speed reducer (4) according to claim 1, characterized in that: The transmission mechanism (43) comprises: A secondary sun gear (431), which is disposed between the secondary gear ring (42) and the primary gear ring (414) and is coaxially fixedly connected to the primary gear ring (414); a secondary planetary gear (432), which is disposed between the secondary sun gear (431) and the secondary ring gear (42), and meshes with the secondary sun gear (431) and the secondary ring gear (42); The secondary planet carrier (433) is used to be fixed on the bridge housing (1); the secondary planet gear (432) is connected to the secondary planet carrier (433) and can rotate around its own axis.

3. The two-speed reducer (4) according to claim 2, characterized in that: The secondary ring gear (42) can be selectively connected to the primary planet carrier (413) or the secondary planet carrier (433) through a shift mechanism to limit the relative rotation of the secondary ring gear (42) and the primary planet carrier (413) or the secondary planet carrier (433).

4. The two-speed reducer (4) according to claim 1, characterized in that: The shift mechanism comprises: A first fixed engagement sleeve (441), which is coaxial with the primary sun gear (411) and fixed to the primary planet carrier (413); A second fixed engagement sleeve (442) which is coaxial with the primary sun gear (411) and fixed to the bridge housing (1); A sliding engagement sleeve (443) is coaxial with the secondary gear ring (42) and is spline-connected to the secondary gear ring (42); the sliding engagement sleeve (443) can move axially relative to the bridge housing (1); and the sliding engagement sleeve (443) can move to engage with the first fixed engagement sleeve (441) or the second fixed engagement sleeve (442).

5. The two-speed reducer (4) according to claim 4, characterized in that: The sliding engagement sleeve (443) can be moved to be disengaged from the first fixed engagement sleeve (441) and the second fixed engagement sleeve (442).

6. An electric drive device, characterized in that: include: A two-speed reducer (4) as claimed in any one of claims 1 to 5; The motor (2) has an output shaft coaxially fixed with the primary sun gear (411).

7. An electric drive axle assembly, characterized in that: include: Axle housing (1); Two electric drive devices according to claim 6, arranged in the bridge housing (1); Two half shafts (3) are coaxially arranged, the half shafts (3) are rotatably connected to the bridge housing (1), the two half shafts (3) are respectively connected to the first-stage planetary carriers (413) of the two electric drive devices, and the half shafts (3) are coaxial with the rotation axis of the first-stage planetary carriers (413), and when the first-stage planetary carriers (413) rotate, the output power of the motor (2) is transmitted to the half shafts (3), and the half shafts (3) are used to connect to wheels to drive the wheels to rotate.

8. The electric drive axle assembly according to claim 7, characterized in that: One end of the half shaft (3) is fixed to the primary planet carrier (413), and the other end is connected to the wheel via a wheel-side reducer (5).

9. The electric drive axle assembly according to claim 8, characterized in that: The wheel-side reducer (5) is a fixed speed ratio reducer.

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