Transmission mechanism and dual-motor electric drive axle assembly

Abstract

The application relates to a transmission mechanism and a double-motor electric drive axle assembly. The mechanism comprises a first input shaft and a second input shaft; a first planetary reducer, the sun gear of which is connected with the first input shaft and the second input shaft, the planet carrier being an output end, the second input shaft being connected with the sun gear through a first one-way transmission member and connected with the planet carrier through a one-way transmission structure, the second input shaft rotating in a first rotating direction to transmit power to the sun gear through the first one-way transmission member and disconnect the power transmission between the one-way transmission structure, the second input shaft reversely rotating to transmit power to the planet carrier through the one-way transmission structure and disconnect the power transmission between the sun gear, and the planet carrier rotating in the same direction when the second input shaft rotates in the first rotating direction or reversely rotates. The application can meet the power demand of high-speed driving and climbing working conditions, the power of a single motor is relatively low, the maximum rotating speed of the motor is low, the falling point of the high-efficiency area is consistent with the working condition point of the whole vehicle, and the utilization rate of the high-efficiency area is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric drive systems, and in particular to a transmission mechanism and a dual-motor electric drive axle assembly. BACKGROUND

[0002] The electric drive axle is the mainstream development trend of the current new energy vehicle power system, and can meet the needs of integration, high efficiency and light weight of the new energy vehicle power system.

[0003] The structural difficulty of the electric drive axle lies in arranging the reduction mechanism in the limited space of the axle housing, so that the vehicle can meet the needs of regular driving, climbing and high-speed driving.

[0004] The current electric drive axle adopts a structure form of a single motor plus a two-gear reducer, and in order to meet the needs of climbing and high-speed driving, the size and power of the single motor need to be relatively large, which causes the inconsistency between the motor efficient area and the vehicle working condition, and the low utilization rate of the motor efficient area. SUMMARY

[0005] Based on the above description, the present application provides a transmission mechanism and a dual-motor electric drive axle assembly to solve the problem in the related art that the electric drive axle adopts a structure form of a single motor plus a two-gear reducer, the size and power of the single motor need to be relatively large, which causes the inconsistency between the motor efficient area and the vehicle working condition, and the low utilization rate of the motor efficient area.

[0006] The technical solution of the present application to solve the above technical problems is as follows:

[0007] In a first aspect, the present application provides a transmission mechanism, and the technical solution adopted is as follows:

[0008] A transmission mechanism, comprising:

[0009] A first input shaft and a second input shaft are respectively used to connect different power sources;

[0010] A first planetary reducer, a sun gear of which is coaxially connected with the first input shaft and the second input shaft as a power input end, and a planet carrier of which is used as an output end for outputting power, the second input shaft being connected with the sun gear of the first planetary reducer through a first one-way transmission member and connected with the planet carrier of the first planetary reducer through a one-way transmission structure, when the second input shaft rotates in a first rotation direction, power is transmitted to the sun gear of the first planetary reducer through the first one-way transmission member, and power transmission between the one-way transmission structure is disconnected, when the second input shaft reversely rotates, power is transmitted to the planet carrier of the first planetary reducer through the one-way transmission structure, and power transmission between the sun gear of the first planetary reducer is disconnected, and when the second input shaft rotates in the first rotation direction or reversely rotates, the planet carrier of the first planetary reducer is driven to rotate in the same direction.

[0011] Preferably, a first shift mechanism is further included for connecting the axle housing and the ring gear of the first planetary reducer, the first shift mechanism being used for limiting rotation of the ring gear of the first planetary reducer and being capable of releasing the limitation, when the second input shaft rotates in a direction opposite to the first rotation direction, power is transmitted to the ring gear of the first planetary reducer through the one-way transmission structure.

[0012] Preferably, the one-way transmission structure includes a second planetary reducer and a second one-way transmission member, a sun gear of the second planetary reducer being coaxial with the sun gear of the first planetary reducer, a planet carrier of the second planetary reducer being used for being fixed with the axle housing, a ring gear of the second planetary reducer being fixed with the ring gear of the first planetary reducer, the second input shaft being connected with the sun gear of the second planetary reducer through the second one-way transmission member, when the second input shaft rotates in a direction opposite to the first rotation direction, power is transmitted to the sun gear of the second planetary reducer through the second one-way transmission member.

[0013] Preferably, the first shift mechanism includes a first sliding engagement sleeve, which is used for being connected to the axle housing and being limited from rotating relative to the axle housing, and the first sliding engagement sleeve is axially slidable to engage or disengage with the ring gear of the first planetary reducer.

[0014] Preferably, the second input shaft comprises a first segment and a second segment, the first segment is connected with the sun gear of the first planetary reducer through the first one-way transmission, the second segment is connected with the planet carrier of the first planetary reducer through the one-way transmission structure, the first segment is selectively connected with or disconnected from the second segment through a second shift mechanism, and the first segment and the second segment are disconnected through the second shift mechanism when the sun gear of the first planetary reducer rotates in a direction opposite to the first rotation direction.

[0015] Preferably, the second shift mechanism comprises a first shift gear, a second shift gear and a second sliding engagement sleeve, the first shift gear and the second shift gear are coaxially fixed with the first segment and the second segment respectively, the second sliding engagement sleeve is coaxially arranged outside the first shift gear and engaged with the first shift gear, and the second sliding engagement sleeve can slide axially relative to the first shift gear to engage or disengage with the second shift gear.

[0016] Preferably, the sun gears of the first planetary reducer and the second planetary reducer have the same outer diameter, and the ring gears have the same inner diameter.

[0017] Preferably, the first transmission comprises a one-way clutch.

[0018] Preferably, the planet carrier of the first planetary reducer is connected with a driving gear coaxial with the sun gear, and the planet carrier outputs power through the driving gear.

[0019] In a second aspect, the application provides a dual-motor electric drive axle assembly, comprising a transmission mechanism as described above and two motors, the two motors are respectively connected with the first input shaft and the second input shaft.

[0020] Compared with the prior art, the technical scheme of the application has at least the following beneficial technical effects:

[0021] 1. The application sets two input shafts and a first planetary reducer, the power source outputs power through two first input shafts and a second input shaft to the sun gear, the power is input to the planet carrier through the cooperation of the sun gear, the planet gear and the ring gear, and the power is output through the planet carrier. Through the setting of the first one-way transmission and the and one-way transmission structure, the power source connected with the second input shaft does not output power during normal driving, and the power source connected with the first input shaft outputs power to the first planetary reducer and outputs power through the planet carrier. When the torque needs to be increased, the power source connected with the second input shaft outputs power to the second input shaft, so that the second input shaft rotates in the same direction as the first input shaft, and the direction is the first rotation direction. At this time, the second input shaft power is transmitted to the sun gear of the first planetary reducer, that is, the two power sources output power to the sun gear at the same time, so as to increase the output torque of the planet carrier and meet the demand of large torque under the working condition of climbing. When high-speed driving is needed, the power source connected with the second input shaft outputs power to the second input shaft, so that the second input shaft rotates in the opposite direction of the first input shaft, that is, the second input shaft rotates in the opposite direction of the first rotation direction. At this time, the second input shaft outputs power and is directly transmitted to the planet carrier of the first planetary reducer through the one-way transmission structure, and cooperates with the first input shaft to output power, so as to increase the rotation speed of the planet carrier of the first planetary reducer and meet the demand of high-speed driving. Since two power sources are used, in the case of a motor as the power source, the power of a single motor can be designed to be relatively low, the load rate of the single motor is high when the motor works, the maximum speed of the motor is low, the high-efficiency area is consistent with the working condition point of the vehicle, the utilization rate of the high-efficiency area is high, and the two-stage reduction transmission efficiency of the planetary reducer is high.

[0022] 2. The application designs the one-way transmission structure to include a second planetary reducer, and realizes power transmission between the second input shaft and the planet carrier of the first planetary reducer through the second planetary reducer. The structure design is simple, and the space occupied by the bridge shell is small. The first one-way transmission member adopts a one-way clutch, which can realize one-way power transmission of the second input shaft to the sun gear. The second input shaft is provided with a first section and a second section, and the first section and the second section are connected by a second shift mechanism. In the driving working condition, the first section and the second section are connected, so that the second input shaft power can be directly input to the sun gear of the first planetary reducer, or transmitted to the planet carrier of the first planetary reducer through the one-way transmission structure. In the reverse working condition, the first section and the second section are disconnected, so that when the sun gear of the first planetary reducer is driven to rotate in the opposite direction of the first rotation direction by the first input shaft, the sun gear power is blocked from being transmitted to the second section through the first one-way transmission member after being transmitted to the first section, thereby avoiding the transmission mechanism from being stuck and achieving the purpose of driving the vehicle forward and backward. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1A structural schematic diagram of a double-motor electric drive axle assembly provided by an embodiment of the present application is shown in the figure.

[0024] Figure 2 A schematic diagram of a transmission structure in a double-motor electric drive axle assembly provided by an embodiment of the present application is shown in the figure.

[0025] Reference signs:

[0026] 1, motor; 2, first input shaft; 3, second input shaft; 31, first section; 32, second section; 4, first planetary reducer; 5, second planetary reducer; 6, sun gear; 7, planet gear; 8, ring gear; 9, planet carrier; 10, first sliding engagement sleeve; 11, one-way clutch; 12, driving gear; 13, driven gear; 14, second shift mechanism; 141, first shift gear; 142, second shift gear; 143, second sliding engagement sleeve. DETAILED DESCRIPTION

[0027] For the purpose of promoting an understanding of the present application, the present application will now be described in greater detail with reference to the relevant drawings. The 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. Rather, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] It will be understood that the spatially relative terms "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0030] It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. "Connected" in the following embodiments should be understood as "electrically connected", "communicatively connected" and the like if the circuits, modules, units and the like connected to each other have transmission of electrical signals or data.

[0031] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "comprising" or "including" or "having" or the like, specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0032] Referring to Figures 1-2 As shown in the figure, the embodiment of the present application provides a dual-motor electric drive axle assembly, which comprises a transmission mechanism and two motors 1.

[0033] Referring to Figures 1-2 As shown in the figure, the transmission mechanism comprises a first input shaft 2, a second input shaft 3 and a first planetary reducer 4, and the first input shaft 2 and the second input shaft 3 are respectively used to connect different power sources. In the embodiment, the power sources are two motors 1, i.e. the first input shaft 2 and the second input shaft 3 are respectively connected with the output shafts of the two motors 1, and the two motors 1 output power to the first input shaft 2 and the second input shaft 3 respectively.

[0034] Referring to Figures 1-2 As shown in the figure, the sun gear 6 of the first planetary reducer 4 is coaxially connected with the first input shaft 2 and the second input shaft 3 as a power input end, and the planetary carrier 9 is used as an output end to output power. Specifically, the first planetary reducer 4 comprises a sun gear 6, a planet gear 7, a planetary carrier 9 and a ring gear 8, and in the installation, the planetary carrier 9 and the ring gear 8 are rotatably installed on the axle housing through bearings, the motor 1 is fixed with the axle housing, the output shafts of the two motors 1 are connected with the sun gear 6 of the first planetary reducer 4 through the first input shaft 2 and the second input shaft 3, and then the power is input to the first planetary reducer 4, and the power is output through the planetary carrier 9 of the first planetary reducer 4 after being reduced.

[0035] Referring to Figures 1-2The first input shaft 2 is coaxially fixed with the sun gear 6 of the first planetary reducer 4, and the second input shaft 3 is connected with the sun gear 6 of the first planetary reducer 4 through the first one-way transmission member and connected with the carrier 9 of the first planetary reducer 4 through the one-way transmission structure. When the second input shaft 3 rotates in the first rotation direction, the power is transmitted to the sun gear 6 of the first planetary reducer 4 through the first one-way transmission member, and the power transmission between the one-way transmission structure is disconnected. When the second input shaft 3 reversely rotates, the power is transmitted to the carrier 9 of the first planetary reducer 4 through the one-way transmission structure, and the power transmission between the sun gear 6 of the first planetary reducer 4 is disconnected. When the second input shaft 3 rotates in the first rotation direction or reversely rotates, the direction of the carrier 9 of the first planetary reducer 4 is the same.

[0036] Through the above setting, when driving normally, the power source connected with the second input shaft 3 does not output power, and the power source connected with the first input shaft 2 outputs power to the first planetary reducer 4 and outputs power through the carrier 9. When the torque needs to be increased, the power source connected with the second input shaft 3 outputs power to the second input shaft 3, so that the second input shaft 3 rotates in the same direction as the first input shaft 2, and the direction is the first rotation direction. At this time, the second input shaft 3 transmits power to the sun gear 6 of the first planetary reducer 4, that is, the two power sources simultaneously output power to the sun gear 6, so as to increase the output torque of the carrier 9, and meet the large torque demand under the working condition of climbing. When high-speed driving is required, the power source connected with the second input shaft 3 outputs power to the second input shaft 3, so that the second input shaft 3 rotates in the opposite direction of the first input shaft 2, that is, the second input shaft 3 rotates in the opposite direction of the first rotation direction. At this time, the second input shaft 3 outputs power through the one-way transmission structure and directly transmits to the carrier 9 of the first planetary reducer 4, which cooperates with the output power of the first input shaft 2 to realize the function of increasing the rotation speed of the carrier 9 of the first planetary reducer 4, and meets the demand of high-speed driving working condition. Since two power sources are used, in the case of the power source being the motor 1, the power of the single motor 1 can be designed to be low, the load rate of the single motor 1 is high when the motor 1 works, the maximum speed of the motor 1 is low, the high-efficiency area landing point is consistent with the vehicle working condition point, the utilization rate of the high-efficiency area is high, and the two-stage reduction transmission efficiency of the planetary reducer is high.

[0037] Referring to Figures 1-2Further, a first shift mechanism is arranged to connect the axle housing and the ring gear 8 of the first planetary reducer 4, and to limit the rotation of the ring gear 8 of the first planetary reducer 4 and to release the limitation. When the input shaft rotates in the direction opposite to the first rotation direction, the power is transmitted to the ring gear 8 of the first planetary reducer 4 through the one-way transmission structure. Specifically, when the first shift mechanism limits the rotation of the ring gear 8 of the first planetary reducer 4, the power input to the first planetary reducer 4 from the first input shaft 2 and the second input shaft 3 is all output through the carrier 9, thereby ensuring that the power output from the single motor 1 during normal driving and the power output from the double motors 1 during climbing are smoothly transmitted to the half shafts. When the first shift mechanism releases the limitation on the rotation of the ring gear 8 of the first planetary reducer 4, the power output from the second input shaft 3 is input to the ring gear 8 through the one-way transmission structure, so that the ring gear 8 rotates in the same direction as the first input shaft 2, so as to accelerate the rotation of the carrier 9 of the first planetary reducer 4 through the ring gear 8, thereby increasing the output rotation speed and realizing high-speed driving.

[0038] Referring to Figures 1-2 As shown, the first shift mechanism includes a first sliding engagement sleeve 10 which is connected to the axle housing and is limited to rotate relative to the axle housing, and the first sliding engagement sleeve 10 can slide axially to engage or disengage with the ring gear 8 of the first planetary reducer 4. Specifically, in this embodiment, the first sliding engagement sleeve 10 is coaxially arranged outside the ring gear 8 of the first planetary reducer 4, a fixed engagement sleeve which is always engaged with the first sliding engagement sleeve 10 is fixed on the axle housing, and engagement teeth are arranged outside the ring gear 8 for cooperation with the first sliding engagement sleeve 10, and the first sliding engagement sleeve 10 can slide axially relative to the axle housing to engage or disengage with the engagement teeth outside the ring gear 8, so as to limit the rotation of the ring gear 8 through cooperation of the first sliding engagement sleeve 10 and the fixed engagement sleeve, or release the limitation. In other embodiments, the position of the first sliding engagement sleeve 10 can be arranged according to actual conditions, for example, the first sliding engagement sleeve 10 is arranged inside the ring gear 8, and the first sliding engagement sleeve 10 can slide to directly engage or disengage with the teeth inside the ring gear 8.

[0039] Referring to Figures 1-2As shown, further, the one-way transmission structure comprises a second planetary reducer 5 and a second one-way transmission member, the sun gear 6 of the second planetary reducer 5 is coaxial with the sun gear 6 of the first planetary reducer 4, the planet carrier 9 of the second planetary reducer 5 is used to be fixed with the axle housing, the ring gear 8 of the second planetary reducer 5 is fixed with the ring gear 8 of the first planetary reducer 4, the second input shaft 3 is connected with the sun gear 6 of the second planetary reducer 5 through the second one-way transmission member, when the second input shaft 3 rotates in the direction opposite to the first rotation direction, the power is transmitted to the sun gear 6 of the second planetary reducer 5 through the second one-way transmission member. In the high-speed driving working condition, the first shift mechanism contacts to limit the rotation of the ring gear 8 of the first planetary reducer 4, the second input shaft 3 outputs power to the sun gear 6 of the second planetary reducer 5, the power is transmitted to the ring gear 8 through the planetary gear 7 of the second planetary reducer 5, the ring gear 8 of the second planetary reducer 5 outputs power to the ring gear 8 of the first planetary reducer 4, and then the ring gear 8 of the first planetary reducer 4 accelerates the rotation of the planet carrier 9 to meet the high-speed driving requirement through the two motors 1. The first planetary reducer 4 and the second planetary reducer 5 are both two-stage reducers, the power transmission efficiency is high, and the energy utilization rate is high.

[0040] Referring to Figures 1-2 As shown, in the embodiment, the ring gears 8 of the first planetary reducer 4 and the second planetary reducer 5 are integrally formed, or the first planetary reducer 4 and the second planetary reducer 5 share the ring gear 8; the outer diameters of the sun gears 6 of the first planetary reducer 4 and the second planetary reducer 5 are the same, and the inner diameters of the ring gears 8 are the same, that is, the first planetary reducer 4 and the second planetary reducer 5 have the same reduction ratio.

[0041] Referring to Figures 1-2 As shown, further, the first one-way transmission member and the second one-way transmission member both adopt the one-way clutch 11, which can realize the purpose that the power output by the second input shaft 3 is transmitted to the sun gear 6 of the first planetary reducer 4 or the sun gear 6 of the second planetary reducer 5 in one direction.

[0042] At the same time, in order to avoid the mechanism from being stuck in the reverse driving working condition, the second input shaft 3 is provided with a first section 31 and a second section 32, the first section 31 is connected with the sun gear 6 of the first planetary reducer 4 through the first one-way transmission member, the second section 32 is connected with the planet carrier 9 of the first planetary reducer 4 through the one-way transmission structure, the first section 31 is selectively connected with or disconnected from the second section 32 through the second shift mechanism 14, and the first section 31 and the second section 32 are disconnected through the second shift mechanism 14 when the sun gear 6 of the first planetary reducer 4 rotates in the direction opposite to the first rotation direction.

[0043] Specifically, the second shift mechanism 14 comprises a first shift gear 141, a second shift gear 142 and a second sliding engagement sleeve 143, the first shift gear 141 and the second shift gear 142 are coaxially fixed with the first section 31 and the second section 32 respectively, the second sliding engagement sleeve 143 is coaxially arranged outside the first shift gear 141 and engaged with the first shift gear 141, and the second sliding engagement sleeve 143 can slide axially relative to the first shift gear 141 to engage or disengage with the second shift gear 142.

[0044] Through the above arrangement, under the normal driving condition, the second sliding engagement sleeve 143 is engaged with the first shift gear 141 and the second shift gear 142 at the same time, so that the first section 31 and the second section 32 are connected, at this time, the power of the second input shaft 3 can be directly input to the sun gear 6 of the first planetary reducer 4, or transmitted to the planet carrier 9 of the first planetary reducer 4 through the one-way transmission structure. While under the reverse driving condition, the second sliding engagement sleeve 143 is disengaged with the second shift gear 142, the first section 31 and the second section 32 are disconnected, the first input shaft 2 rotates in the direction opposite to the first rotation direction, the power is blocked after being transmitted to the first section 31 through the sun gear 6 and the first one-way transmission part of the first planetary reducer 4, and the second section 32 does not rotate, thereby avoiding the mechanism from being stuck, that is, the reverse driving is realized through the single motor 1 cooperating with the first planetary reducer 4. Therefore, the transmission structure can meet the transmission requirements of low-speed and high-speed driving, large-torque climbing and reverse driving.

[0045] Referring to Figures 1-2 Further, in order to facilitate the output of power of the planet carrier 9 of the first planetary reducer 4, the planet carrier 9 of the first planetary reducer 4 is connected with a driving gear 12 coaxial with the sun gear 6, and the planet carrier 9 outputs power through the driving gear 12.

[0046] Referring to Figure 1 Further, the double-motor 1 electric drive axle assembly of the embodiment further comprises a driven gear 13, the driven gear 13 is engaged with the driving gear 12 and has a diameter greater than that of the driving gear 12, and the driven gear 13 is used for being rotatably installed on the axle housing to further reduce and output the power output by the driving gear 12.

[0047] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transmission mechanism, characterized by, The application relates to a power transmission device for a vehicle, which comprises: a first input shaft (2) and a second input shaft (3) for connecting different power sources; a first planetary reducer (4), a sun gear (6) of the first planetary reducer (4) being coaxially connected with the first input shaft (2) and the second input shaft (3) as a power input end, a planet carrier (9) of the first planetary reducer (4) being used as an output end for outputting power, the second input shaft (3) being connected with the sun gear (6) of the first planetary reducer (4) through a first one-way transmission member and being connected with the planet carrier (9) of the first planetary reducer (4) through a one-way transmission structure, when the second input shaft (3) rotates in a first rotating direction, power is transmitted to the sun gear (6) of the first planetary reducer (4) through the first one-way transmission member, and power transmission between the one-way transmission structure and the first planetary reducer (4) is disconnected, when the second input shaft (3) reversely rotates, power is transmitted to the planet carrier (9) of the first planetary reducer (4) through the one-way transmission structure, and power transmission between the sun gear (6) of the first planetary reducer (4) is disconnected, and when the second input shaft (3) rotates in the first rotating direction or reversely rotates, the planet carrier (9) of the first planetary reducer (4) is driven to rotate in the same direction. The one-way transmission structure comprises a second planetary reducer (5) and a second one-way transmission member, a sun gear (6) of the second planetary reducer (5) is coaxial with the sun gear (6) of the first planetary reducer (4), a planet carrier (9) of the second planetary reducer (5) is used for being fixed with an axle housing, a ring gear (8) of the second planetary reducer (5) is fixed with the ring gear (8) of the first planetary reducer (4), the second input shaft (3) is connected with the sun gear (6) of the second planetary reducer (5) through the second one-way transmission member, when the second input shaft (3) rotates in a direction opposite to the first rotating direction, power is transmitted to the sun gear (6) of the second planetary reducer (5) through the second one-way transmission member.

2. The transmission mechanism of claim 1, wherein: The application further comprises a first shift mechanism, the first shift mechanism is used for connecting the axle housing and the ring gear (8) of the first planetary reducer (4), the first shift mechanism is used for limiting the rotation of the ring gear (8) of the first planetary reducer (4) and can release the limitation, when the second input shaft (3) rotates in the direction opposite to the first rotating direction, power is transmitted to the ring gear (8) of the first planetary reducer (4) through the one-way transmission structure.

3. The transmission mechanism of claim 2, wherein: The first shift mechanism comprises a first sliding engagement sleeve (10), the first sliding engagement sleeve (10) is used for being connected to the axle housing and being limited to rotate relative to the axle housing, and the first sliding engagement sleeve (10) can slide in an axial direction to engage or disengage with the ring gear (8) of the first planetary reducer (4).

4. The transmission mechanism of claim 1, wherein: The second input shaft (3) comprises a first section (31) and a second section (32), the first section (31) is connected with the sun gear (6) of the first planetary reducer (4) through the first one-way transmission, the second section (32) is connected with the planet carrier (9) of the first planetary reducer (4) through the one-way transmission structure, the first section (31) is selectively connected or disconnected with the second section (32) through the second shift mechanism (14), and the first section (31) and the second section (32) are disconnected through the second shift mechanism (14) when the sun gear (6) of the first planetary reducer (4) rotates in the direction opposite to the first rotation direction.

5. The transmission mechanism of claim 4, wherein: The second shift mechanism (14) comprises a first shift gear (141), a second shift gear (142) and a second sliding engagement sleeve (143), the first shift gear (141) and the second shift gear (142) are coaxially fixed with the first section (31) and the second section (32) respectively, the second sliding engagement sleeve (143) is coaxially arranged outside the first shift gear (141) and engaged with the first shift gear (141), and the second sliding engagement sleeve (143) can slide axially relative to the first shift gear (141) to engage or disengage with the second shift gear (142).

6. The transmission of claim 1, wherein: The sun gear (6) of the first planetary reducer (4) and the sun gear (6) of the second planetary reducer (5) have the same outer diameter, and the ring gear (8) of the first planetary reducer (4) and the ring gear (8) of the second planetary reducer (5) have the same inner diameter.

7. The transmission of claim 1, wherein: The first one-way transmission is a one-way clutch (11).

8. The transmission of claim 1, wherein: The planet carrier (9) of the first planetary reducer (4) is connected with a driving gear (12) coaxial with the sun gear (6) of the first planetary reducer (4), and the planet carrier (9) of the first planetary reducer (4) outputs power through the driving gear (12).

9. A dual-motor electric drive axle assembly comprising: The transmission mechanism comprises the transmission mechanism and a power source, and the power source comprises two motors (1), and the two motors (1) are connected with the first input shaft (2) and the second input shaft (3) respectively.

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