Differential device, power assembly and vehicle

Abstract

The utility model discloses a differential device, a power assembly and a vehicle, and relates to the technical field of differential mechanisms, the differential device comprises a mounting frame, a differential mechanism and a transmission assembly, and the differential mechanism comprises a differential gear assembly and a differential rotating shaft; the transmission assembly comprises a sun gear and a plurality of planet gear sets meshed with the sun gear, each planet gear set comprises a transmission rotating shaft and a planet gear, the planet gears are in transmission connection with the transmission rotating shafts, and each planet gear comprises a first planet gear meshed with the sun gear and a second planet gear which is coaxially arranged with the first planet gear and synchronously rotates with the first planet gear; the multiple second planetary gears are arranged around the peripheral side of the differential mechanism at intervals, the radial direction of the rotating axis of the differential rotating shaft is the first direction, and the projection of at least part of the second planetary gears in the first direction falls on the differential mechanism; according to the technical scheme provided by the utility model, the length of the differential device in the axial direction can be reduced, so that the differential device is miniaturized.

Description

Technical Field

[0001] This utility model relates to the field of differential technology, and in particular to a differential device, powertrain, and vehicle. Background Technology

[0002] The differential is a mechanism that enables the left and right drive wheels to rotate at different speeds. It mainly consists of a left half-shaft gear, a right half-shaft gear, two planetary gears, a differential housing, and a main reduction gear. The differential housing is fixed on the main reduction gear set. The left half-shaft gear, the right half-shaft gear, and the two planetary gears are set inside the differential housing, and the left half-shaft gear and the right half-shaft gear mesh with the two planetary gears respectively. This arrangement results in a large axial dimension of the differential device, which cannot meet the design requirements for miniaturization of the differential device. Utility Model Content

[0003] The main purpose of this utility model is to propose a differential device, powertrain, and vehicle, which aims to solve the problem that existing differential devices cannot meet the design requirements for miniaturization.

[0004] To achieve the above objectives, this utility model proposes a differential device, comprising:

[0005] Mounting rack;

[0006] A differential gear assembly includes a differential gear assembly and a differential shaft, the differential shaft being mounted on the mounting bracket, and the differential gear assembly and the differential shaft being drively connected.

[0007] A transmission assembly includes a sun gear and a plurality of planetary gear sets meshing with the sun gear. The sun gear is rotatably mounted on the mounting frame. Each planetary gear set includes a transmission shaft and planetary gears. The planetary gears are connected to the transmission shaft. The transmission shaft is mounted on the mounting frame along the rotation axis of the differential shaft. Each planetary gear includes a first planetary gear meshing with the sun gear and a second planetary gear coaxially arranged and rotating synchronously with the first planetary gear.

[0008] A plurality of second planetary gears are spaced apart around the outer periphery of the differential, the radial direction of the rotation axis of the differential shaft is a first direction, and at least a portion of the projections of the second planetary gears along the first direction fall on the differential.

[0009] In one embodiment, the mounting bracket includes a mounting bracket body and a cover. The mounting bracket body is provided with a first mounting plate, a connecting plate, a second mounting plate, and a surrounding plate in sequence along the rotation axis of the differential shaft. The surrounding plate is located at the end of the second mounting plate away from the first mounting plate and has a receiving cavity. The differential is located in the receiving cavity. The cover is detachably located at the end of the surrounding plate away from the second mounting plate to cover the receiving cavity.

[0010] The outer periphery of the enclosure is provided with a plurality of protrusions, each of which corresponds to a portion of the first mounting plate along the rotation axis of the differential shaft, and the planetary gear set is disposed between the first mounting plate and the protrusion.

[0011] In one embodiment, the first mounting plate, the connecting plate, the second mounting plate, and the surrounding plate are an integral structure.

[0012] In one embodiment, the cover is made of aluminum alloy;

[0013] And / or, the cover includes a cover body and an insert, the insert being disposed on the surface of the cover body facing the differential, the insert corresponding to the gasket of the differential.

[0014] In one embodiment, the second mounting plate has a recess, and the projection of the protrusion along the rotation axis of the differential shaft passes through the recess and rests on the first mounting plate.

[0015] In one embodiment, the protrusion is located at the end of the enclosure away from the second mounting plate.

[0016] In one embodiment, the differential gear assembly includes a first half-shaft gear, a second half-shaft gear, and bevel gears. A plurality of bevel gears are rotatably disposed on the differential shaft. The plurality of bevel gears and the differential shaft are disposed between the first half-shaft gear and the second half-shaft gear, and respectively mesh with the first half-shaft gear and the second half-shaft gear.

[0017] In one embodiment, the differential shaft is a cross shaft;

[0018] The number of bevel gears is four, and the four bevel gears are rotatably disposed at the four ends of the cross shaft.

[0019] This utility model also proposes a powertrain including a differential device as described in the above embodiments.

[0020] This utility model also proposes a vehicle, including the powertrain described in the above embodiments.

[0021] The technical solution of this utility model is to arrange the planetary gear set in the transmission assembly around the outer periphery of the differential, so that the projection of at least part of the transmission bearing in the planetary gear set and the planetary gear set sleeved on the outer periphery of the transmission bearing falls on the differential; and so that the projection of at least part of the second planetary gear in the planetary gear set along the first direction falls on the differential, thereby reducing the axial length of the transmission assembly and the differential during installation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of an embodiment of the differential device provided by this utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure with the transmission components removed.

[0025] Figure 3 A schematic diagram of the differential provided by this utility model;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure of the middle cover.

[0027] Explanation of icon numbers:

[0028] 1. Differential device; 10. Mounting bracket; 11. Mounting bracket body; 111. First mounting plate; 112. Connecting plate; 113. Second mounting plate; 1131. Recess; 114. Enclosure; 1141. Receiving cavity; 1142. Protrusion; 12. Cover; 121. Insert; 20. Differential; 21. Differential gear set; 211. First half-shaft gear; 212. Second half-shaft gear; 213. Bevel gear; 22. Differential shaft; 30. Transmission assembly; 31. Sun gear; 32. Planetary gear set; 321. Transmission shaft; 322. Planetary gear; 3221. First planetary gear; 3222. Second planetary gear.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] Currently, the existing differential housing is fixed on the main reduction gear set, and the left half-shaft gear, right half-shaft gear, and two planetary gears are set inside the differential housing. The left half-shaft gear and right half-shaft gear mesh with the two planetary gears respectively. The differential device with this arrangement has a large overall axial dimension because the differential housing and the main reduction gear set are set in series along the axial direction when installed. This means that the differential device needs a longer axial dimension for installation when it is put into use. The differential device with this arrangement cannot meet the design requirements of miniaturization.

[0034] To solve the above-mentioned technical problems, this utility model proposes a differential device 1.

[0035] Please see Figure 1In one embodiment of this utility model, the differential device 1 includes a mounting bracket 10, a differential 20, and a transmission assembly 30. The differential 20 is mounted on the mounting bracket 10 and rotates coaxially with it. The transmission assembly 30 is also mounted on the mounting bracket 10 and is connected to an external power assembly to drive the mounting bracket 10 to rotate. For example, if the differential device 1 is installed on a vehicle, the external power assembly is the vehicle's output shaft, which is connected to the transmission assembly 30 to drive the mounting bracket 10 to rotate. When the mounting bracket 10 rotates, it drives the differential 20 to rotate synchronously. The differential 20 then transmits power to external mechanisms at different speeds depending on the actual situation.

[0036] In this embodiment, the differential 20 includes a differential gear set 21 and a differential shaft 22. The differential shaft 22 is mounted on the mounting bracket 10, and the differential gear set 21 and the differential shaft 22 are pulsatorically connected. The differential shaft 22 is mounted on the mounting bracket 10 and pulsatorically connected to the differential gear set 21. When the mounting bracket 10 rotates, it drives the differential gear set 21 to rotate synchronously. The differential gear set 21 includes multiple gears, some of which are rotatably mounted on the differential shaft 22, while others mesh with other gears.

[0037] The transmission assembly 30 includes a sun gear 31 and a plurality of planetary gear sets 32 meshing with the sun gear 31. The sun gear 31 is rotatably mounted on the mounting frame 10. Each planetary gear set 32 ​​includes a transmission shaft 321 and planetary gears 322. The planetary gears 322 are connected to the transmission shaft 321. The transmission shaft 321 is mounted on the mounting frame 10 along the rotation axis of the differential shaft 22. Each planetary gear 322 includes a first planetary gear 3221 meshing with the sun gear 31 and a second planetary gear 3222 coaxially arranged and rotating synchronously with the first planetary gear 3221. The plurality of second planetary gears 3222 are spaced apart around the outer periphery of the differential 20. The radial direction of the rotation axis of the differential shaft 22 is a first direction. At least a portion of the projections of the second planetary gears 3222 along the first direction fall on the differential 20.

[0038] In this embodiment, the transmission assembly 30 includes a sun gear 31 and a plurality of planetary gear sets 32, wherein each planetary gear set 32 ​​meshes with the sun gear 31. The sun gear 31 may be entirely housed within the mounting frame 10 (not shown in the figure), or it may be partially housed within the mounting frame 10 and extend beyond the mounting frame 10. For example, the sun gear 31 may be entirely housed within the mounting frame 10, and the sun gear 31 may be connected to an external power source via a connector, such as a pin, spline column, etc., without much limitation. If the sun gear 31 is partially housed within the mounting frame 10 and extends beyond the mounting frame 10, then the other part of the sun gear 31 may be directly connected to the external power source, while the portion of the sun gear 31 within the mounting frame 10 may mesh with the plurality of planetary gear sets 32.

[0039] In this embodiment, the planetary gear set 32 ​​includes a drive shaft 321 and planetary gears 322. The planetary gears 322 are rotatably disposed outside the drive shaft 321, while the drive shaft 321 is mounted on the mounting bracket 10 along the rotation axis of the differential shaft 22. The planetary gears 322 include a first planetary gear 3221 that meshes with the sun gear 31 and a second planetary gear 3222 that is coaxially arranged with and rotates synchronously with the first planetary gear 3221. In this embodiment, the diameter of the second planetary gear 3222 is smaller than that of the first planetary gear 3221. Planetary gear 3221 and second planetary gear 3222 have an internal gear ring (not shown in the figure) meshing with it on their outer periphery. This internal gear ring is fixedly connected to the housing. In this embodiment, an external power source drives the sun gear 31 to rotate, which in turn drives multiple first planetary gears 3221 to rotate. When the first planetary gears 3221 rotate, the second planetary gears 3222 rotate synchronously. The second planetary gears 3222 rotate along the teeth of the internal gear ring, thereby driving the mounting bracket 10 and the differential 20 to rotate via the transmission shaft 321. In this embodiment, the first planetary gear 3221 and the second planetary gear 3222 are an integral structure.

[0040] To reduce the axial length requirement (axial direction being the rotation axis of the differential shaft 22) after the transmission assembly 30 and differential 20 are assembled, in this embodiment, the planetary gear set 32 ​​in the transmission assembly 30 is arranged around the outer periphery of the differential 20, such that at least a portion of the projection of the transmission bearing in the planetary gear set 32 ​​and the planetary gear 322 set sleeved on the outer periphery of the transmission bearing falls on the differential 20; for example, at least a portion of the projection of the second planetary gear 3222 in the planetary gear 322 set along the first direction falls on the differential 20, thereby reducing the axial length requirement when the transmission assembly 30 and differential 20 are installed; of course, all the projections of the second planetary gear 3222 in the planetary gear 322 set along the first direction can also fall on the differential 20, thus making the required axial length even shorter; in this embodiment, the radial direction of the rotation axis of the differential shaft 22 is defined as the first direction, such as Figure 3 As shown, X is the rotation direction of the differential shaft 22, and Y is the rotation axis of the differential shaft 22. The radial direction perpendicular to Y is defined as the first direction.

[0041] There is no specific limit to the number of planetary gear sets 32; it can be one set, two sets, or three sets. For example, ... Figure 1 As shown, there are three sets of planetary gear sets 32.

[0042] In one embodiment, the mounting bracket 10 includes a mounting bracket 10 body and a cover 12. The mounting bracket 10 body is provided with a first mounting plate 111, a connecting plate 112, a second mounting plate 113, and a surrounding plate 114 in sequence along the rotation axis of the differential shaft 22. The surrounding plate 114 is disposed at the end of the second mounting plate 113 away from the first mounting plate 111. The surrounding plate 114 has a receiving cavity 1141. The differential 20 is disposed in the receiving cavity 1141. The cover 12 is detachably disposed at the end of the surrounding plate 114 away from the second mounting plate 113 to cover the receiving cavity 1141.

[0043] The outer periphery of the enclosure 114 is provided with a plurality of protrusions 1142, each of the protrusions 1142 corresponding to a portion of the first mounting plate 111 along the rotation axis of the differential shaft 22, and the planetary gear set 32 ​​is disposed between the first mounting plate 111 and the protrusions 1142.

[0044] like Figure 2 As shown, the mounting bracket 10 includes a mounting bracket 10 body and a cover 12, which are detachably connected. The mounting bracket 10 body includes a first mounting plate 111, a connecting plate 112, a second mounting plate 113, and a surrounding plate 114 arranged sequentially along the Y direction. The first mounting plate 111 is connected to the second mounting plate 113 via the connecting plate 112, forming a mounting cavity for accommodating the sun gear 31. The surrounding plate 114 is disposed on the second mounting plate 113 away from the first mounting plate 111. On one side, in this embodiment, the enclosure 114 can be one piece or multiple pieces; for example, one enclosure 114 has a receiving cavity 1141, which is used for mounting the differential 20, and the receiving cavity 1141 is connected to the mounting cavity. If there are multiple enclosures 114, the multiple enclosures 114 surround or are spaced apart to form the receiving cavity 1141. The multiple enclosures 114 are spaced apart to form through holes, which can be used as oil holes and / or heat dissipation holes. No further limitations are made in this regard.

[0045] In this embodiment, a plurality of protrusions 1142 are provided on the outer periphery of the enclosure plate 114. The projection of the protrusions 1142 along the Y direction falls on the first mounting plate 111, and the planetary gear set 32 ​​is installed between the first mounting plate 111 and the protrusions 1142. For example, the diameter of the first mounting plate 111 is larger than that of the second mounting plate 113, and the projection of the protrusions 1142 on the enclosure plate 114 along the Y direction protrudes from the second mounting plate 113 and falls on the first mounting plate 111. This not only allows the planetary gear set 32 ​​to be installed, but also shortens the axial length of the differential device 1. Alternatively, the diameter of the first mounting plate 111 can be the same as that of the second mounting plate 113, but the first mounting plate 111 is provided with lugs corresponding to the protrusions 1142 for the installation of the planetary gear set 32. No further limitations are imposed on this.

[0046] In one embodiment, such as Figure 4 As shown, the cover 12 is provided with multiple oil inlets. The oil inlets not only facilitate refueling, but also further reduce the weight of the cover 12 itself.

[0047] In one embodiment, the first mounting plate 111, the connecting plate 112, the second mounting plate 113, and the surrounding plate 114 are an integral structure. Figure 2 As shown, in this embodiment, the first mounting plate 111, the connecting plate 112, the second mounting plate 113, and the surrounding plate 114 can be integrally formed by casting or by welding later to form an integral structure. No further limitations are imposed on this.

[0048] In one embodiment, the cover 12 is made of aluminum alloy;

[0049] In order to make the differential device 1 lightweight, in this embodiment, the cover 12 is made of aluminum alloy. In order to improve the wear resistance of aluminum alloy, in other embodiments, the aluminum alloy is anodized to obtain anodized aluminum alloy. This makes the design of the cover 12 not only lightweight the differential device 1, but also improve the wear resistance of the cover 12.

[0050] In one embodiment, the cover 12 includes a cover 12 body and an insert 121. The insert 121 is disposed on the surface of the cover 12 body facing the differential 20, and the insert 121 corresponds to the gasket of the differential 20. To improve the wear resistance of the cover 12, in this embodiment, the cover 12 includes a cover 12 body and an insert 121, wherein the insert 121 is disposed on the side of the cover 12 body facing the differential 20, and the insert 121 is correspondingly disposed to the gasket disposed on the differential 20. That is, after the cover 12 is installed on the mounting bracket 10 body, the cover 12 abuts against the gasket on the differential 20, which serves as a wear part, through the insert 121. In this embodiment, the insert 121 is made of a material with better wear resistance than the cover 12. For example, the insert 121 can be titanium alloy, niobium microalloy, high manganese steel, and alloy cast iron, etc., without further limitation.

[0051] To improve the wear resistance of the cover 12, the solution of using aluminum alloy or anodized aluminum alloy as the material of the cover 12 in the above embodiment can be combined with the solution in this embodiment.

[0052] In one embodiment, the second mounting plate 113 has a recess 1131, and the projection of the protrusion 1142 along the rotation axis of the differential shaft 22 passes through the recess 1131 and falls onto the first mounting plate 111. Figure 2 As shown, in order to reduce the radial space occupied during the installation of the planetary gear set 32, in this embodiment, a recess 1131 is provided on the second mounting plate 113 so that a portion of the diameter of the second mounting plate 113 is equal to the diameter of the first mounting plate 111, and the connecting plate 112 connects the two at a position where the diameter of the second mounting plate 113 is equal to the diameter of the first mounting plate 111. The recess 1131 of the second mounting plate 113 allows the transmission bearing in the planetary gear set 32 ​​to pass through the recess 1131 and connect with the first mounting plate 111 and the protrusion 1142 on the outer periphery of the surrounding plate 114. This arrangement not only reduces the axial length of the differential device 1, but also reduces the radial area occupied by the differential device 1.

[0053] In one embodiment, the protrusion 1142 is located at the end of the enclosure 114 away from the second mounting plate 113. To ensure that the projection of the second planetary gear 3222 in the planetary gear set along the first direction falls entirely on the differential 20, thereby minimizing the axial length of the differential device 1, in this embodiment, the protrusion 1142 is located at the end of the enclosure 114 away from the second mounting plate 113. This allows the transmission bearing, positioned between the first mounting plate 111 and the protrusion 1142, to maximize the utilization of the outer periphery of the differential 20's axial length, ensuring that the projection of the second planetary gear 3222 along the first direction falls entirely on the differential 20. Of course, in other embodiments, the protrusion 1142 may also be located on the cover 12, or it may be located at the middle position of the enclosure 114 along the first direction; no further limitations are imposed on this.

[0054] In one embodiment, the differential gear set 21 includes a first half-shaft gear 211, a second half-shaft gear 212, and bevel gears 213. A plurality of bevel gears 213 are rotatably mounted on the differential shaft 22. The plurality of bevel gears 213 and the differential shaft 22 are located between the first half-shaft gear 211 and the second half-shaft gear 212, and mesh with the first half-shaft gear 211 and the second half-shaft gear 212 respectively. Figure 3 As shown, in this embodiment, the differential gear set 21 includes a first half-shaft gear 211 connected to an external drive shaft, a second half-shaft gear 212 connected to another external drive shaft, and a bevel gear 213 meshing with the first half-shaft gear 211 and the second half-shaft gear 212. The bevel gear 213 is rotatably mounted on the differential shaft 22. The differential shaft 22 and the bevel gear 213 are located between the first half-shaft gear 211 and the second half-shaft gear 212, and mesh with the first half-shaft gear 211 and the second half-shaft gear 212 respectively. When the resistances on the two external drive shafts are the same, the bevel gear 213 remains different and simultaneously drives the two external drive shafts to rotate coaxially. When the resistances on the two external drive shafts are different, the bevel gear 213 will push the first half-shaft gear 211 or the second half-shaft gear 212 to rotate at different speeds, thereby achieving the effect of differential operation.

[0055] In one embodiment, the differential shaft 22 is a cross shaft;

[0056] The number of bevel gears 213 is four, and the four bevel gears 213 are rotatably disposed at the four ends of the cross shaft. For example... Figure 3As shown, in this embodiment, the differential shaft 22 is a cross shaft, and there are four bevel gears 213. The four bevel gears 213 are rotatably mounted at the four ends of the cross shaft, and each bevel gear 213 is connected to a bearing on the cross shaft. The four ends of the cross shaft pass through the enclosure plate 114 of the mounting bracket 10 and are fixedly connected to the enclosure plate 114, so that when the mounting bracket 10 rotates, the cross shaft drives the four bevel gears 213 to rotate synchronously. This arrangement allows the differential device 1 to significantly improve the load-bearing capacity of the differential 20 within an effective radial space. Of course, in other embodiments, the differential shaft 22 can be a slotted shaft, which has one or more shafts, for example, two, three or four shafts. The bevel gear 213 varies depending on the number of slotted shafts. The bevel gear 213 is arranged one-to-one on the slotted shaft and rotatably disposed at the end of the slotted shaft. This can achieve the same effect as described above. Therefore, there are no specific limitations on the specific arrangement of the differential shaft 22 or the specific number of bevel gears 213.

[0057] This utility model also proposes a powertrain, which includes a differential device 1. The specific structure of the differential device 1 is as described in the above embodiments. Since this powertrain adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0058] This utility model also proposes a vehicle, which includes a powertrain as described in the above embodiments. The powertrain includes a differential device 1, and the specific structure of the differential device 1 is as described in the above embodiments. Since this vehicle adopts the above powertrain, and the powertrain adopts all the technical solutions of all embodiments of the above differential device 1, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0059] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A differential device characterized by, include: Mounting rack; A differential gear assembly includes a differential gear assembly and a differential shaft, the differential shaft being mounted on the mounting bracket, and the differential gear assembly and the differential shaft being drively connected. A transmission assembly includes a sun gear and a plurality of planetary gear sets meshing with the sun gear. The sun gear is rotatably mounted on the mounting frame. Each planetary gear set includes a transmission shaft and planetary gears. The planetary gears are connected to the transmission shaft. The transmission shaft is mounted on the mounting frame along the rotation axis of the differential shaft. Each planetary gear includes a first planetary gear meshing with the sun gear and a second planetary gear coaxially arranged and rotating synchronously with the first planetary gear. A plurality of second planetary gears are spaced apart around the outer periphery of the differential, the radial direction of the rotation axis of the differential shaft is a first direction, and at least a portion of the projections of the second planetary gears along the first direction fall on the differential.

2. The differential assembly of claim 1, wherein, The mounting bracket includes a mounting bracket body and a cover. The mounting bracket body is provided with a first mounting plate, a connecting plate, a second mounting plate and a surrounding plate in sequence along the rotation axis of the differential shaft. The surrounding plate is located at the end of the second mounting plate away from the first mounting plate and has a receiving cavity. The differential is located in the receiving cavity. The cover is detachably located at the end of the surrounding plate away from the second mounting plate to cover the receiving cavity. The outer periphery of the enclosure is provided with a plurality of protrusions, each of which corresponds to a portion of the first mounting plate along the rotation axis of the differential shaft, and the planetary gear set is disposed between the first mounting plate and the protrusion.

3. The differential assembly of claim 2, wherein: The first mounting plate, the connecting plate, the second mounting plate, and the surrounding plate are an integral structure.

4. The differential assembly of claim 2, wherein: The cover is made of aluminum alloy; And / or, the cover includes a cover body and an insert, the insert being disposed on the surface of the cover body facing the differential, the insert corresponding to the gasket of the differential.

5. The differential assembly of claim 2, wherein: The second mounting plate has a recessed portion, and the projection of the protrusion along the rotation axis of the differential shaft passes through the recessed portion and lands on the first mounting plate.

6. The differential device as described in claim 2, characterized in that, The protrusion is located at the end of the enclosure away from the second mounting plate.

7. The differential device of any one of claims 1 to 6, wherein The differential gear assembly includes a first half-shaft gear, a second half-shaft gear, and bevel gears. A plurality of bevel gears are rotatably mounted on the differential shaft. The plurality of bevel gears and the differential shaft are located between the first half-shaft gear and the second half-shaft gear, and mesh with the first half-shaft gear and the second half-shaft gear respectively.

8. The differential assembly of claim 7, wherein: The differential shaft is a cross shaft; The number of bevel gears is four, and the four bevel gears are rotatably disposed at the four ends of the cross shaft.

9. A powertrain characterized by, Includes the differential device as described in any one of claims 1 to 8.

10. A vehicle characterized by comprising: Includes the powertrain as described in claim 9.

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