Electric drive rear axle assembly

Abstract

This utility model discloses an electric drive rear axle assembly, relating to the technical field of cleaning vehicle / sweeper application equipment. The electric drive rear axle assembly includes an electric motor, a reducer mechanism, and a differential mechanism. In the differential mechanism, planetary gears are mounted and positioned in the hollow area of ​​the driven gear, and half-shaft gears are arranged vertically relative to the planetary gears. This makes the internal structure of the differential highly integrated, effectively reducing the overall volume of the differential, thereby reducing the overall size of the electric drive rear axle assembly and saving vehicle interior space.

Description

Technical Field

[0001] This utility model relates to the technical field of cleaning vehicle / sweeper application equipment, and in particular to an electric drive rear axle assembly. Background Technology

[0002] like Figure 1 As shown, in the traditional differential structure, a frame 200 is set on the bevel gear 100, and two planetary gears 300 are set on the frame 200. The planetary gears 300 are connected to the sun gear 400, thereby driving the two output shafts 500 to rotate. It can be seen that because the various structures inside the differential are scattered when the frame 200 is set, the overall structure of the differential is large. This makes the structure of the electric drive rear axle assembly using it large, resulting in it occupying a large space in the cleaning vehicle / sweeper.

[0003] Furthermore, according to the search, Chinese utility model patent with publication number CN208457137U discloses a rear-wheel drive reduction and differential structure for an electric sweeper. As can be seen from the accompanying drawings in the specification, the structure of its differential is similar to that of a traditional differential. Essentially, it replaces the frame with a box structure. In this patent, it fails to achieve a high degree of integration of the differential to reduce its overall volume, and still has a lot of free space for a high degree of concentration of the overall structure of the differential.

[0004] Therefore, solutions to the above problems are urgently needed. Utility Model Content

[0005] The present invention aims to solve the technical problems mentioned in the background art. The purpose of the present invention is to provide an electric drive rear axle assembly. By arranging and positioning the planetary gear and the half-shaft gear in the hollow area of ​​the driven gear, the internal structure of the differential is highly integrated, effectively reducing the overall volume of the differential, and thus reducing the overall size of the electric drive rear axle assembly. When applied to cleaning vehicles / sweepers, it can save the vehicle's internal space.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An electric drive rear axle assembly, comprising:

[0008] Electric motor;

[0009] A reducer mechanism and a differential mechanism, wherein the reducer mechanism is located between the electric motor and the differential mechanism and is connected to both the electric motor and the differential mechanism, and the reducer mechanism is used to transmit rotational motion from the electric motor to the differential mechanism.

[0010] The differential mechanism includes a driven gear, a first planetary gear, a second planetary gear, a first half-shaft gear, and a second half-shaft gear.

[0011] The driven gear is hollow in the middle, and a fixed shaft is mounted in the hollow area of ​​the driven gear. The fixed shaft passes through the center of the first planetary gear and the center of the second planetary gear in sequence to install and position the first planetary gear and the second planetary gear.

[0012] The first half-shaft gear is disposed above the driven gear, and the first half-shaft gear meshes with the first planetary gear and the second planetary gear. The first half-shaft gear is connected to a short drive half-shaft.

[0013] The second half-shaft gear is located below the driven gear, and the second half-shaft gear meshes with the first planetary gear and the second planetary gear. The second half-shaft gear is connected to a long drive half-shaft.

[0014] Furthermore, the differential mechanism also includes:

[0015] An upper differential housing and a lower differential housing, wherein the upper differential housing is mounted on the upper side of the driven gear, and the lower differential housing is mounted on the lower side of the driven gear;

[0016] After the upper differential housing, lower differential housing, and driven gear are assembled and installed, a first cavity is formed between the upper differential housing and the lower differential housing.

[0017] The first planetary gear, the second planetary gear, the first half-shaft gear, the second half-shaft gear, and the fixed shaft are disposed in the first cavity.

[0018] Furthermore, the upper differential housing is similar in shape to the first half-shaft gear;

[0019] The lower differential housing is similar in shape to the second half-shaft gear.

[0020] Furthermore, the driven gear has a concave center to form a first step and a second step that are aligned vertically.

[0021] After the upper differential housing, lower differential housing, and driven gear are assembled and installed, the upper differential housing is placed on the first step, and the lower differential housing is placed on the second step.

[0022] Furthermore, a plurality of first grooves are formed by recessing at local locations on the inner wall of the driven gear;

[0023] After the upper differential housing, lower differential housing, and driven gear are assembled, the upper differential housing, lower differential housing, and driven gear are fixed by using fasteners that pass through the upper differential housing, the first groove, and the lower differential housing in sequence.

[0024] Furthermore, two second grooves are formed in a recessed position on a local location of the inner peripheral wall of the driven gear, and the positions of the two second grooves are opposite to each other;

[0025] The fixed shaft is fixedly installed between the two first slots.

[0026] Furthermore, the lower end of the short drive half shaft is provided with a first external tooth, and the first half shaft gear is provided with a first internal tooth. The short drive half shaft and the first half shaft gear are connected by the interlocking of the first external tooth and the first internal tooth.

[0027] The lower end of the long drive half-shaft is provided with a second external tooth, and the second half-shaft gear is provided with a second internal tooth. The long drive half-shaft and the second half-shaft gear are connected by the interlocking of the second external tooth and the second internal tooth.

[0028] Furthermore, the reducer mechanism includes:

[0029] First-stage reduction gear;

[0030] A secondary reduction gear, wherein the primary reduction gear is fixedly mounted on the upper end of the secondary reduction gear, and the secondary reduction gear is meshed with the driven gear;

[0031] The electric motor provides rotational motion, causing the first-stage reduction gear to rotate and simultaneously causing the second-stage reduction gear to rotate, which in turn drives the driven gear to rotate.

[0032] Furthermore, the electric motor, reducer mechanism, and differential mechanism are arranged in a triangular pattern.

[0033] Furthermore, the electric drive rear axle assembly also includes:

[0034] The box body includes an upper box cover and a lower box cover, which form a second cavity after being assembled with the upper box cover and the lower box cover;

[0035] A speed reducer mechanism is provided on the lower cover, and the speed reducer mechanism is located in the second cavity;

[0036] A differential mechanism is provided on the lower cover, the short drive half shaft passes through the upper cover and is placed outside the housing, and the long drive half shaft passes through the lower cover and is placed outside the housing;

[0037] The drive end of the electric motor passes through the lower cover and is placed inside the second cavity.

[0038] The beneficial effect of this application is that it provides an electric drive rear axle assembly, which includes an electric motor, a reducer mechanism and a differential mechanism. In the differential mechanism, the planetary gear is mounted and positioned in the hollow area of ​​the driven gear, and the half-shaft gear is arranged vertically relative to the planetary gear, so that the internal structure of the differential is highly integrated, effectively reducing the overall volume of the differential, thereby reducing the overall size of the electric drive rear axle assembly and saving vehicle interior space.

[0039] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the differential mechanism in a traditional electric drive rear axle assembly in the prior art;

[0041] Figure 2 This is a schematic diagram of the structure of an electrically driven rear axle assembly in this embodiment;

[0042] Figure 3 yes Figure 2 A schematic diagram of the structure at point A in the middle;

[0043] Figure 4 This is a schematic diagram of an electric drive rear axle assembly in this embodiment, which includes an upper differential housing and a lower differential housing.

[0044] Figure 5 This is a structural schematic diagram of an electrically driven rear axle assembly from another angle in this embodiment;

[0045] Figure 6 yes Figure 5 A schematic diagram of the structure at point B in the middle;

[0046] Figure 7 This is a schematic diagram of an electric drive rear axle assembly in this embodiment, which includes an upper cover and a lower cover.

[0047] Figure 8 This is a schematic diagram of the structure of an electric drive rear axle assembly in this embodiment when the upper and lower covers are in a disassembled state.

[0048] Figure label:

[0049] 1. Electric motor; 2. Reducer mechanism; 3. Differential mechanism; 31. Driven gear; 321. First planetary gear; 322. Second planetary gear; 331. First half-shaft gear; 332. Second half-shaft gear; 41. Short drive half-shaft; 42. Long drive half-shaft; 30. Fixed shaft; 341. Upper differential housing; 342. Lower differential housing; 351. First step; 352. Second step; 361. First groove; 362. Second groove; 3311. First internal gear; 411. First external gear; 3322. Second internal gear; 422. Second external gear; 21. First-stage reduction gear; 22. Second-stage reduction gear; 5. Housing; 51. Upper housing cover; 52. Lower housing cover. Detailed Implementation

[0050] To better illustrate this utility model, a further detailed description of this utility model is provided below with reference to the accompanying drawings.

[0051] It should be understood that, in order to make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0052] Based on an understanding of existing technologies, traditional differential structures typically involve mounting a frame on a bevel gear, with planetary gears then connected to a sun gear to drive the output shaft. This layout results in a fragmented distribution of internal components, failing to achieve high integration and leading to a large overall differential size. This size issue directly results in an excessively large space occupied by the electric drive rear axle assembly, limiting its application in vehicle design and potentially impacting the vehicle's overall layout and performance.

[0053] Therefore, the technical problem that this application actually solves is how to reduce the overall size of the electric drive rear axle assembly.

[0054] The following is an illustration using a specific example:

[0055] In this embodiment, as Figure 2 and Figure 3 As shown, an electric drive rear axle assembly is provided, comprising:

[0056] Electric motor 1;

[0057] The reducer mechanism 2 and the differential mechanism 3 are provided. The reducer mechanism 2 is located between the electric motor 1 and the differential mechanism 3 and is connected to the electric motor 1 and the differential mechanism 3. The reducer mechanism 2 is used to transmit rotational motion from the electric motor 1 to the differential mechanism 3.

[0058] The differential mechanism 3 includes a driven gear 31, a first planetary gear 321, a second planetary gear 322, a first half-shaft gear 331, and a second half-shaft gear 332.

[0059] The driven gear 31 is hollow in the middle, and a fixed shaft 30 is mounted in the hollow area of ​​the driven gear 31. The fixed shaft 30 passes through the center of the first planetary gear 321 and the center of the second planetary gear 322 in sequence to install and position the first planetary gear 321 and the second planetary gear 322.

[0060] The first half-shaft gear 331 is disposed above the driven gear 31. The first half-shaft gear 331 meshes with the first planetary gear 321 and the second planetary gear 322. The first half-shaft gear 331 is connected to a short drive half-shaft 41.

[0061] The second half-shaft gear 332 is disposed below the driven gear 31. The second half-shaft gear 332 meshes with the first planetary gear 321 and the second planetary gear 322. The second half-shaft gear 332 is connected to a long drive half-shaft 42.

[0062] By designing the driven gear 31 to be hollow in the middle and mounting a fixed shaft 30 in its hollow area, the first planetary gear 321 and the second planetary gear 322 can be installed and positioned on the fixed shaft 30. At the same time, the first half-shaft gear 331 and the second half-shaft gear 332 are respectively positioned above and below the driven gear 31 and mesh with the planetary gears, thereby achieving axial compact integration of the internal components of the differential. This effectively solves the problem of the existing differential structure being scattered and having a large overall volume, and achieves the effect of significantly reducing the space occupied by the electric drive rear axle assembly.

[0063] Based on the above, the electric drive rear axle assembly in this embodiment solves the problem of the existing differential structure being scattered and having a large overall volume, resulting in excessive space occupation of the electric drive rear axle assembly. By designing the driven gear 31 as hollow in the middle, and integrating the fixed shaft 30, the first planetary gear 321, and the second planetary gear 322 in this hollow area, while arranging the first half-shaft gear 331 and the second half-shaft gear 332 above and below the driven gear 31 respectively, the axial compact stacking and radial dimension compression of the internal components of the differential mechanism are achieved. This innovative structural layout significantly reduces the overall volume of the differential mechanism 3, thereby reducing the space occupied by the electric drive rear axle assembly and improving its integration and applicability in vehicles (especially space-sensitive applications such as cleaning vehicles / sweepers).

[0064] In this embodiment, as Figures 2 to 4 As shown, the differential mechanism 3 further includes:

[0065] An upper differential housing 341 and a lower differential housing 342 are provided. The upper differential housing 341 is mounted on the upper side of the driven gear 31, and the lower differential housing 342 is mounted on the lower side of the driven gear 31. After the upper differential housing 341, the lower differential housing 342 and the driven gear 31 are assembled together, a first cavity (not shown) is formed between the upper differential housing 341 and the lower differential housing 342. The first planetary gear 321, the second planetary gear 322, the first half-shaft gear 331, the second half-shaft gear 332 and the fixed shaft 30 are provided in the first cavity (not shown).

[0066] Specifically, firstly, the upper differential housing 341 and the lower differential housing 342 are respectively mounted on the upper and lower sides of the driven gear 31, thus forming an internal space together with the driven gear 31, namely the first cavity (not shown). This first cavity (not shown) accommodates all the core transmission components of the differential mechanism 3, including the first planetary gear 321, the second planetary gear 322, the first half-shaft gear 331, the second half-shaft gear 332, and the fixed shaft 30. This structural layout effectively integrates and protects internal components that might otherwise be scattered or exposed. When the differential mechanism 3 is running, the first cavity (not shown) can effectively prevent the intrusion of external dust and impurities, protecting the cleanliness of the internal gears and shafts.

[0067] Secondly, the upper differential housing 341 and the lower differential housing 342 can be used to constrain the setting positions of the short drive half shaft 41, the long drive half shaft 42, and the corresponding first half shaft gear 331 and second half shaft gear 332. The connection tightness between the first half shaft gear 331 and the second half shaft gear 332 and the first planetary gear 321 and the second planetary gear 322 can be adjusted by improving the dimensions of the upper differential housing 341 and the lower differential housing 342.

[0068] In this embodiment, the upper differential housing 341 is similar in shape to the first half-shaft gear 331; the lower differential housing 342 is similar in shape to the second half-shaft gear 332.

[0069] During mold design, the contour of its inner cavity is precisely designed to match the outer contour of the first half-shaft gear 331, especially the shape of the teeth and bearing mounting area of ​​the first half-shaft gear 331. For example, both the upper differential housing 341 and the lower differential housing 342 are cone-shaped, and both the first half-shaft gear 331 and the second half-shaft gear 332 are umbrella-shaped. Thus, during installation, the first half-shaft gear 331 can match the shape of the upper differential housing 341, leaving only the necessary assembly clearance after installation. Similarly, the first half-shaft gear 331 can match the shape of the upper differential housing 341, leaving only the necessary assembly clearance after installation. This solves the problem of low internal space utilization of the differential and further eliminates the empty areas inside, making the overall structure of the differential more compact and achieving a high degree of integration of the differential mechanism 3. This further solves the problem of large volume and large space occupation of the electric drive rear axle assembly in the prior art.

[0070] In this embodiment, as Figure 3 and Figure 5 and Figure 6 As shown, the driven gear 31 has a concave center to form a first step 351 and a second step 352 that are aligned vertically.

[0071] After the upper differential housing 341, the lower differential housing 342 and the driven gear 31 are assembled and installed, the upper differential housing 341 is placed on the first step 351 and the lower differential housing 342 is placed on the second step 352.

[0072] The first step 351 and the second step 352 form a tight fit or transition fit with the corresponding upper differential housing 341 and lower differential housing 342.

[0073] Specifically, the lower end face of the upper differential housing 341 can be designed as a plane contacting the upper surface of the first step 351 or a chamfered annular surface, while the upper end face of the lower differential housing 342 can be designed as a plane contacting the lower surface of the second step 352 or a chamfered annular surface. During assembly, the upper differential housing 341 and lower differential housing 342 can be directly placed so that their outer peripheral walls form a radial fit with the inner wall of the driven gear 31, while their end faces precisely sit on the corresponding first step 351 and second step 352. This fit ensures both axial and radial positioning of the upper differential housing 341 and lower differential housing 342 within the driven gear 31, thereby achieving self-alignment during assembly and preventing displacement or wobbling caused by forces during differential operation. This improves assembly accuracy when the upper differential housing 341 and lower differential housing 342 are assembled with the driven gear 31.

[0074] Furthermore, by making full use of the internal space of the driven gear 31, a higher degree of integration and compactness of the differential mechanism 3 is achieved, effectively reducing the overall volume of the differential, thereby meeting the requirements of the electric drive rear axle assembly for miniaturization and high integration.

[0075] In this embodiment, the fixed connection between the upper differential housing 341 and the lower differential housing 342 is achieved as follows: Figure 3 and Figure 6 As shown, a plurality of U-shaped first grooves 361 are formed by recessing at a local position on the inner wall of the driven gear 31. These first grooves 361 can be regarded as through holes penetrating the wall thickness of the driven gear 31.

[0076] After the upper differential housing 341, the lower differential housing 342 and the driven gear 31 are combined, the upper differential housing 341, the lower differential housing 342 and the driven gear 31 are fixed by using fasteners that pass through the upper differential housing 341, the first groove 361 and the lower differential housing 342 in sequence.

[0077] In this embodiment, two second grooves 362 are recessed at a local position on the inner peripheral wall of the driven gear 31. The two second grooves 362 are different from the first groove 361 described above, and the two second grooves 362 are positioned opposite each other. The fixed shaft 30 is fixedly installed between the two first grooves 361.

[0078] Specifically, two opposing second grooves 362 are formed by recessing a portion of the inner peripheral wall of the driven gear 31, which provide a direct and integrated mounting point for the fixed shaft 30. These second grooves 362 serve as a dedicated load-bearing structure for the fixed shaft 30, providing balanced and stable support to the fixed shaft 30, thereby ensuring the stability of the fixed shaft 30.

[0079] In this embodiment, as Figure 3 and Figure 6 As shown, the lower end of the short drive half shaft 41 is provided with a first external tooth 411, and the first half shaft gear 331 is provided with a first internal tooth 3311. The short drive half shaft 41 and the first half shaft gear 331 are connected by the mutual engagement of the first external tooth 411 and the first internal tooth 3311.

[0080] The lower end of the long drive half-shaft 42 is provided with a second external tooth 422, and the second half-shaft gear 332 is provided with a second internal tooth 3322. The long drive half-shaft 42 and the second half-shaft gear 332 are connected by the mutual engagement of the second external tooth 422 and the second internal tooth 3322.

[0081] Based on the operating logic of the electric drive rear axle assembly, when the differential mechanism 3 receives the rotational motion transmitted by the reducer mechanism 2, the first half-shaft gear 331 and the second half-shaft gear 332 inside it will rotate accordingly. In order to accurately and effectively transmit the rotational motion of these gears to the short drive half-shaft 41 and the long drive half-shaft 42, a gear connection method is adopted.

[0082] The lower end of the short drive half-shaft 41 is provided with a first external tooth 411, while the first half-shaft gear 331 has a first internal tooth 3311 that matches the first external tooth 411. When the short drive half-shaft 41 is inserted into the first half-shaft gear 331, the first external tooth 411 and the first internal tooth 3311 engage with each other, forming a tight connection. This engagement ensures that the rotational motion of the first half-shaft gear 331 can be synchronously transmitted to the short drive half-shaft 41 without gaps or relative slippage. Similarly, the upper end of the long drive half-shaft 42 is provided with a second external tooth 422, and the second half-shaft gear 332 has a second internal tooth 3322 that matches the second external tooth 422. When the long drive half-shaft 42 is inserted into the second half-shaft gear 332, the second external tooth 422 and the second internal tooth 3322 engage with each other, realizing synchronous rotation and effective power transmission between the long drive half-shaft 42 and the second half-shaft gear 332. This enables the entire electric drive rear axle assembly to have a more stable and reliable power output in practical applications.

[0083] In this embodiment, as Figures 2 to 4 As shown, the reducer mechanism 2 includes:

[0084] First-stage reduction gear 21;

[0085] A secondary reduction gear 22, the upper end of which is fixedly mounted with the primary reduction gear 21, and the secondary reduction gear 22 meshes with the driven gear 31;

[0086] The electric motor 1 provides rotational motion, causing the first-stage reduction gear 21 to rotate and simultaneously causing the second-stage reduction gear 22 to rotate, thereby driving the driven gear 31 to rotate.

[0087] Specifically, the reducer mechanism 2, through its integrated two-stage gear reduction design, achieves efficient power transmission and effective control over the volume of the electric drive rear axle assembly. The rotational motion output by the electric motor 1 is first transmitted to the first-stage reduction gear 21. Since the first-stage reduction gear 21 and the second-stage reduction gear 22 are structurally fixedly connected, forming a compound gear unit, the rotation of the first-stage reduction gear 21 directly and synchronously drives the rotation of the second-stage reduction gear 22. This fixed connection method allows the two stages of reduction to be implemented on the same axis or closely adjacent axes, thus making the entire reducer mechanism 2 more compact.

[0088] This two-stage integrated reduction design not only achieves a large reduction ratio within a limited space, effectively converting the high speed of the electric motor 1 into the low speed and high torque required by the differential mechanism 3, but also avoids the problem of excessive size that might result from using multiple independent gears and shaft systems by fixing the first-stage reduction gear 21 onto the second-stage reduction gear 22. It directly cooperates with the driven gear 31 of the differential mechanism 3, ensuring smooth and efficient power flow, reducing intermediate transmission links, and further improving transmission efficiency and structural compactness. The integration of this compact reduction mechanism 2 with other components in the electric drive rear axle assembly contributes to a significant reduction in the overall assembly size, making it particularly suitable for applications with strict space requirements.

[0089] Based on the reduction in overall volume of the differential mechanism 3, this embodiment further provides a specific and compact reducer mechanism 2, which can further solve the problem of large volume and large space occupation of the electric drive rear axle assembly.

[0090] In this embodiment, the electric motor 1, the reducer mechanism 2, and the differential mechanism 3 are arranged in a triangular pattern.

[0091] In the electric drive rear axle assembly, electric motor 1 provides rotational motion, reduction gear mechanism 2 receives this motion and reduces speed while increasing torque, and differential mechanism 3 distributes power to the left and right drive half-shafts. By arranging these three core components—electric motor 1, reduction gear mechanism 2, and differential mechanism 3—in a triangular configuration, with their respective bodies or axes of rotation positioned at the vertices of a triangle, this geometric arrangement allows for a shorter power transmission path and a smaller overall size, effectively utilizing space compared to linear or less compact layouts. The triangular layout fully leverages the compactness of these components, optimizing the entire power transmission chain spatially and further addressing the issues of large size and space occupation in the electric drive rear axle assembly.

[0092] In this embodiment, as a preferred embodiment, such as Figures 7 to 8 As shown, the electric drive rear axle assembly further includes:

[0093] Housing 5, which provides a protective structure for the output end of electric motor 1, reducer mechanism 2 and differential mechanism 3.

[0094] Specifically, the housing 5 includes an upper cover 51 and a lower cover 52, which together form a second cavity (not shown); a reducer mechanism 2 is provided on the lower cover 52, and the reducer mechanism 2 is located inside the second cavity (not shown); a differential mechanism 3 is provided on the lower cover 52, the short drive half-shaft 41 passes through the upper cover 51 and is located outside the housing 5, and the long drive half-shaft 42 passes through the lower cover 52 and is located outside the housing 5;

[0095] The drive end of the electric motor 1 passes through the lower cover 52, and the drive end of the electric motor 1 is placed in the second cavity (not shown).

[0096] Finally, it should be noted that the above-described embodiments are merely specific implementations of this disclosure, used to illustrate the technical solutions of this disclosure, and not to limit them. The protection scope of this disclosure is not limited thereto. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the scope of the technology disclosed in this disclosure. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure, and should all be covered within the protection scope of this disclosure.

Claims

1. An electrically driven rear axle assembly, characterized in that, include: Electric motor; A reducer mechanism and a differential mechanism, wherein the reducer mechanism is located between the electric motor and the differential mechanism and is connected to both the electric motor and the differential mechanism, and the reducer mechanism is used to transmit rotational motion from the electric motor to the differential mechanism. The differential mechanism includes a driven gear, a first planetary gear, a second planetary gear, a first half-shaft gear, and a second half-shaft gear. The driven gear is hollow in the middle, and a fixed shaft is mounted in the hollow area of ​​the driven gear. The fixed shaft passes through the center of the first planetary gear and the center of the second planetary gear in sequence to install and position the first planetary gear and the second planetary gear. The first half-shaft gear is disposed above the driven gear, and the first half-shaft gear meshes with the first planetary gear and the second planetary gear. The first half-shaft gear is connected to a short drive half-shaft. The second half-shaft gear is located below the driven gear, and the second half-shaft gear meshes with the first planetary gear and the second planetary gear. The second half-shaft gear is connected to a long drive half-shaft.

2. The electric drive rear axle assembly according to claim 1, characterized in that, The differential mechanism also includes: An upper differential housing and a lower differential housing, wherein the upper differential housing is mounted on the upper side of the driven gear, and the lower differential housing is mounted on the lower side of the driven gear; After the upper differential housing, lower differential housing, and driven gear are assembled and installed, a first cavity is formed between the upper differential housing and the lower differential housing. The first planetary gear, the second planetary gear, the first half-shaft gear, the second half-shaft gear, and the fixed shaft are disposed in the first cavity.

3. The electric drive rear axle assembly according to claim 2, characterized in that: The upper differential housing is similar in shape to the first half-shaft gear. The lower differential housing is similar in shape to the second half-shaft gear.

4. The electric drive rear axle assembly according to claim 2, characterized in that: The driven gear has a concave center to form a first step and a second step that are aligned vertically. After the upper differential housing, lower differential housing, and driven gear are assembled and installed, the upper differential housing is placed on the first step, and the lower differential housing is placed on the second step.

5. The electric drive rear axle assembly according to claim 2, characterized in that: Multiple first grooves are formed by recessing at local locations on the inner wall of the driven gear; After the upper differential housing, lower differential housing, and driven gear are assembled, the upper differential housing, lower differential housing, and driven gear are fixed by using fasteners that pass through the upper differential housing, the first groove, and the lower differential housing in sequence.

6. The electric drive rear axle assembly according to claim 1, characterized in that: Two second grooves are formed by recessing at a local position on the inner peripheral wall of the driven gear, and the two second grooves are positioned opposite each other; The fixed shaft is fixedly installed between the two second slots.

7. The electric drive rear axle assembly according to claim 1, characterized in that: The lower end of the short drive half shaft is provided with a first external tooth, and the first half shaft gear is provided with a first internal tooth. The short drive half shaft and the first half shaft gear are connected by the interlocking of the first external tooth and the first internal tooth. The lower end of the long drive half-shaft is provided with a second external tooth, and the second half-shaft gear is provided with a second internal tooth. The long drive half-shaft and the second half-shaft gear are connected by the interlocking of the second external tooth and the second internal tooth.

8. The electric drive rear axle assembly according to claim 1, characterized in that, The reducer mechanism includes: First-stage reduction gear; A secondary reduction gear, wherein the primary reduction gear is fixedly mounted on the upper end of the secondary reduction gear, and the secondary reduction gear is meshed with the driven gear; The electric motor provides rotational motion, causing the first-stage reduction gear to rotate and simultaneously causing the second-stage reduction gear to rotate, which in turn drives the driven gear to rotate.

9. The electric drive rear axle assembly according to claim 8, characterized in that: The electric motor, reducer mechanism, and differential mechanism are arranged in a triangular pattern.

10. The electric drive rear axle assembly according to claim 8, characterized in that, The electric drive rear axle assembly also includes: The box body includes an upper box cover and a lower box cover, which form a second cavity after being assembled with the upper box cover and the lower box cover; A speed reducer mechanism is provided on the lower cover, and the speed reducer mechanism is located in the second cavity; A differential mechanism is provided on the lower cover, the short drive half shaft passes through the upper cover and is placed outside the housing, and the long drive half shaft passes through the lower cover and is placed outside the housing; The drive end of the electric motor passes through the lower cover and is placed inside the second cavity.

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