Differential mechanism shell, differential mechanism assembly, electric drive assembly and vehicle

Abstract

The utility model relates to a differential shell, a differential assembly, an electric drive assembly and a vehicle. The differential shell comprises a cavity part and a connector part, the connector part comprises a shoulder ring section and a journal section, the shoulder ring section is connected with the cavity part, one end of the shoulder ring section is provided with a matching face used for being in butt joint with a half axle gear gasket, an oil channel is formed in the shoulder ring section and provided with an oil inlet and an oil outlet, the oil inlet is located in the outer side face of the differential shell, and the oil outlet is located in the outer side face of the differential shell. The oil outlet is located in the matching face, and the inner circumferential face of the blocking shoulder ring section is connected with the shaft neck section. According to the differential mechanism shell, lubricating oil is introduced into the inner side of the differential mechanism shell, active lubrication between the half axle gear gasket and the matching face is achieved, the problem that lubrication in the differential mechanism shell is insufficient is solved, the situation that a differential mechanism assembly generates abnormal sound is reduced, the NVH performance and durability of the differential mechanism assembly are improved, and the service life of the differential mechanism assembly is prolonged. And therefore, the riding comfort of the vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of differentials, in particular to a differential housing, a differential assembly, an electric drive assembly and a vehicle. Background Art

[0002] In the related art, the differential is lubricated passively, which easily leads to insufficient lubrication inside the differential. It is impossible to carry out targeted lubrication between the half-shaft gear gasket and the differential housing, resulting in abnormal differential noise when the vehicle turns, causing abnormal wear and life reduction between the differential housing and the half-shaft gear gasket, and also reducing the ride comfort of the vehicle. Utility Model Content

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, embodiments of the present invention provide a differential case that provides lubrication between the sideshaft gear washers and mating surfaces, reducing the problem of insufficient lubrication within the differential case. This reduces the risk of abnormal noise caused by insufficient lubrication between the sideshaft gear washers and the differential case during cornering, when the differential assembly faces high torque and low speed. This improves the NVH performance and durability of the differential assembly, thereby enhancing the vehicle's ride comfort.

[0004] An embodiment of the present invention provides a differential assembly.

[0005] An embodiment of the present invention provides an electric drive assembly.

[0006] An embodiment of the present invention provides a vehicle.

[0007] A differential housing according to an embodiment of the present invention includes a cavity portion and an interface portion, wherein the interface portion includes a shoulder ring segment and a journal segment, wherein the shoulder ring segment is connected to the cavity portion, and wherein one axial end of the shoulder ring segment has a mating surface for docking with a half-shaft gear gasket, and an oil passage is provided on the shoulder ring segment, wherein the oil passage has an oil inlet and an oil outlet, wherein the oil inlet is located on the outer surface of the differential housing, and the oil outlet is located on the mating surface, and the inner circumferential surface of the shoulder ring segment is connected to the journal segment.

[0008] The differential case of the embodiment of the utility model opens an oil channel in the shoulder ring section to introduce lubricating oil into the inside of the differential case, thereby achieving active lubrication between the half-shaft gear gasket and the mating surface, reducing the problem of insufficient lubrication inside the differential case. Therefore, when the vehicle turns, the differential assembly faces high torque and low speed, which reduces the occurrence of abnormal noise caused by insufficient lubrication of the half-shaft gear gasket and the differential case, improves the NVH performance and durability of the differential assembly, and further improves the ride comfort of the vehicle.

[0009] In some embodiments, the oil inlet is provided on the outer circumferential surface of the shoulder ring segment, and the outer circumferential surface of the shoulder ring segment is provided with first sealing ring grooves on both sides of the oil inlet.

[0010] In some embodiments, there are multiple oil outlets, and the multiple oil outlets are distributed in a circular manner with equal angles.

[0011] In some embodiments, the distances between two adjacent oil outlets and the center of the shoulder ring segment are different.

[0012] In some embodiments, the plurality of oil outlets are arranged in a circular array, and a line connecting the centers of the plurality of oil outlets is a sine curve.

[0013] In some embodiments, there are multiple oil inlets, and the multiple oil inlets are connected to the multiple oil outlets in a one-to-one correspondence.

[0014] In some embodiments, the oil passage includes a radial section and an axial section, the radial section extends radially along the shoulder ring section, the port of the radial section on the outer peripheral surface of the shoulder ring section forms the oil inlet, the axial section is connected to the radial section, the axial section extends axially along the shoulder ring section, and the port of the axial section on the mating surface forms the oil outlet.

[0015] In some embodiments, the cavity portion has a large end and a small end, the large end and the small end are respectively located on two opposite sides of the cavity portion, and both the large end and the small end are connected to the interface portion.

[0016] The differential assembly of the embodiment of the present utility model includes an oil supply passage and the differential housing, and the oil supply passage is communicated with the oil inlet.

[0017] The differential assembly of the embodiment of the utility model realizes lubrication between the half-shaft gear gasket and the mating surface, reducing the problem of insufficient lubrication inside the differential housing. Therefore, when the vehicle turns, the differential assembly faces high torque and low speed, which reduces the occurrence of abnormal noise caused by insufficient lubrication of the half-shaft gear gasket and the differential housing, improves the NVH performance and durability of the differential assembly, and thus improves the ride comfort of the vehicle.

[0018] In some embodiments, the differential assembly includes a main housing, which is sleeved on the outside of the differential housing, and the oil supply passage is provided on the main housing.

[0019] In some embodiments, the oil inlet is provided on the outer circumferential surface of the shoulder ring segment, and the outer circumferential surface of the shoulder ring segment is provided with a first sealing ring groove on both sides of the oil inlet; the main housing is provided with a second sealing ring groove, the second sealing ring groove corresponding to the first sealing ring groove in the radial direction of the shoulder ring segment, and the outlet of the oil supply passage is located on the inner side surface of the main housing and between the two second sealing ring grooves;

[0020] The differential assembly further includes a sealing ring, one side of which is engaged in the first sealing ring groove, and the other side of which is engaged in the second sealing ring groove, and the main housing and the shoulder ring segment form an oil chamber in the area between the first sealing ring groove and the second sealing ring groove.

[0021] The electric drive assembly of the embodiment of the present utility model includes the differential assembly.

[0022] The electric drive assembly of the embodiment of the present utility model can actively lubricate the spacer between the half-shaft gear and the mating surface, thereby reducing abnormal noise when the vehicle turns.

[0023] The vehicle according to the embodiment of the present utility model includes the electric drive assembly described in any embodiment, or the differential assembly described in any embodiment, or the differential housing described in any embodiment.

[0024] The vehicle of the embodiment of the utility model can actively lubricate the half-axle gear gasket and the mating surface, reducing abnormal noise when the vehicle turns, and has the advantage of good ride comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is one of the structural schematic diagrams of the differential housing of an embodiment of the present utility model;

[0026] Figure 2 This is the second structural diagram of the differential housing of the embodiment of the utility model;

[0027] Figure 3 This is the third structural diagram of the differential housing of the embodiment of the present utility model;

[0028] Figure 4 1 is a schematic cross-sectional view of a differential case according to an embodiment of the present invention;

[0029] Figure 5 1 is a schematic structural diagram of a differential assembly according to an embodiment of the present utility model;

[0030] Figure 6 It is a partial cross-sectional structural schematic diagram of a differential assembly according to an embodiment of the present utility model;

[0031] Reference numerals:

[0032] Differential assembly 1000;

[0033] Differential housing 100, main housing 200, oil supply passage 2002, sealing ring 300, oil chamber 400;

[0034] cavity 1;

[0035] Interface portion 2, shoulder ring segment 21, mating surface 211, oil passage 212, oil inlet 2121, oil outlet 2122, radial segment 2123, axial segment 2124, first sealing ring groove 213;

[0036] The journal section 22 has a mounting hole 221 . DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] Refer to the following Figures 1 to 6 , a differential housing 100, a differential assembly 1000, an electric drive assembly and a vehicle according to an embodiment of the present invention are described in detail.

[0039] like Figures 1 to 6 As shown, the differential assembly 1000 of the embodiment of the present invention includes a differential case 100, half shafts (not shown in the figure), half shaft gears (not shown in the figure), half shaft gear washers (not shown in the figure) and an oil supply circuit 2002.

[0040] like Figures 1 to 4 As shown, the differential case 100 of the present embodiment includes a cavity 1 and an interface 2. The interface 2 includes a shoulder ring segment 21 and a journal segment 22. The shoulder ring segment 21 is connected to the cavity 1. One axial end of the shoulder ring segment 21 has a mating surface 211 for mating with the side gear washer. This mating surface 211 is the inner side of the differential case 100. An oil passage 212 is provided in the shoulder ring segment 21. The oil passage 212 has an oil inlet 2121 and an oil outlet 2122. The oil inlet 2121 is located on the outer side of the differential case 100, while the oil outlet 2122 is located on the mating surface 211. The inner circumference of the shoulder ring segment 21 is connected to the journal segment 22, which has a mounting hole 221.

[0041] The half-shaft is arranged in the mounting hole 221, the half-shaft gear is arranged on the half-shaft, the half-shaft gear gasket is arranged between the mating surface 211 and the half-shaft gear, the main housing 200 is sleeved on the outside of the differential housing 100, and the main housing 200 is provided with an oil supply passage 2002, which is connected to the oil inlet 2121.

[0042] In the differential case 100 of the present embodiment, the end surface of the shoulder ring segment 21 in the axial direction of one end serves as a mating surface 211. The mating surface 211 is the inner side surface of the differential case 100 that rubs against the side gear spacer. The differential case 100 defines an oil passage 212 on the shoulder ring segment 21. The oil inlet 2121 is located on the outer side of the differential case 100, and the oil outlet 2122 is located on the mating surface 211. This allows lubricating oil to flow from the outside of the differential case 100 to the mating surface 211, thereby lubricating the mating surface 211 and the side gear spacer. Furthermore, the location of the oil inlet 2121 on the outer side of the differential case 100 facilitates communication between the oil supply passage 2002 and the oil passage 2121.

[0043] In the differential assembly 1000 of the present embodiment, the oil supply passage 2002 communicates with the oil inlet 2121 of the oil passage 212 on the differential housing 100. The oil supply passage 2002 and the oil passage 212 form a lubricating oil flow path. Lubricating oil flows from the oil supply passage 2002 to the oil passage 212 and out through the oil outlet 2122 of the oil passage 212. After exiting the oil outlet 2122, the lubricating oil directly contacts the mating surface 211 and the side gear spacer, thereby lubricating the side gear spacer and the differential housing 100.

[0044] Therefore, the differential case 100 of the embodiment of the present invention opens an oil passage 212 in the shoulder ring segment 21 to introduce lubricating oil into the inner side of the differential case 100, thereby achieving lubrication between the half-shaft gear gasket and the mating surface 211, reducing the problem of insufficient lubrication inside the differential case 100, so that when the vehicle turns, the differential assembly 1000 faces high torque and low speed, reducing the occurrence of abnormal noise caused by insufficient lubrication of the half-shaft gear gasket and the differential case 100, thereby improving the NVH performance and durability of the differential assembly 1000, and thereby improving the ride comfort of the vehicle.

[0045] Furthermore, the differential assembly 1000 of the present embodiment includes a main housing 200, which is mounted on the outside of the differential housing 100. The main housing 200 is provided with an oil supply passage 2002. The oil supply passage 2002 is provided in the main housing 200, which can utilize a portion of the existing oil passages and oil supply system of the main housing 200, thereby simplifying the configuration of the oil supply passage 2002 and reducing the structural complexity of the differential assembly 1000 of the present embodiment.

[0046] It should be noted that the attached Figure 5 and Figure 6 In the figure, the main shell 200 only shows its partial structure.

[0047] In some embodiments, the cavity 1 has a large end and a small end, the large end and the small end are located on opposite sides of the cavity 1, and both the large end and the small end are connected to the interface part 2. Figure 2 As shown, the large end of cavity 1 is the larger end, and the small end of cavity 1 is the smaller end. Therefore, the two side gear washers of the differential assembly 1000 of the present embodiment have corresponding oil passages 212, which can simultaneously lubricate both side gear washers. This further reduces the occurrence of abnormal noise caused by insufficient lubrication of the side gear washers and the differential case 100, improves the NVH performance and durability of the differential assembly 1000, and further enhances the ride comfort of the vehicle.

[0048] like Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, an oil inlet 2121 is provided on the outer circumference of the shoulder ring segment 21. The outer circumference of the shoulder ring segment 21 is provided with first sealing ring grooves 213 on either side of the oil inlet 2121. Second sealing ring grooves are provided on the main housing 200, radially corresponding to the first sealing ring grooves 213. The outlet of the oil supply passage 2002 is located on the inner side of the main housing 200, between the two second sealing ring grooves. The differential assembly 1000 further includes a sealing ring 300, one side of which fits within the first sealing ring groove 213 and the other side of which fits within the second sealing ring groove. The area between the first and second sealing ring grooves 213 forms an oil chamber 400 between the main housing 200 and the shoulder ring segment 21, thereby forming a lubricating oil flow path from the oil supply passage 2002 to the oil chamber 400 and finally to the oil passage 212.

[0049] The differential assembly 1000 of the embodiment of the present invention utilizes the inner side surface of the main housing 200 located between the two sealing rings 300 and the outer peripheral surface of the shoulder ring segment 21 to form an oil chamber 400. The oil chamber 400 is connected to the outlet of the oil supply passage 2002 and the oil inlet 2121 of the oil channel 212, thereby realizing the connection between the oil supply passage 2002 and the oil inlet 2121. At the same time, it can ensure the sealing of the lubricating oil flow path, and the lubricating oil will not leak outward during the process of flowing from the source to the mating surface 211, so that the lubricating oil can establish oil pressure on the flow path. As the lubricating oil between the half-shaft gear gasket and the mating surface 211 wears, the oil pressure at the oil outlet 2122 of the mating surface 211 decreases, and the lubricating oil flows to the oil outlet 2122, continuously providing lubricating oil to the half-shaft gear gasket and the mating surface 211, and actively lubricating the half-shaft gear gasket and the differential housing 100. In addition, the formation and sealing method of the oil chamber 400 are simple, and the second sealing ring groove on the main housing 200 and the first sealing ring groove 213 on the shoulder ring segment 21 are easy to process and manufacture, so that the connection between the outlet of the oil supply circuit 2002 and the oil inlet 2121 of the oil channel 212 is easy to achieve and low in cost, which is beneficial to reducing the cost and manufacturing difficulty of the differential assembly 1000 of the embodiment of the utility model.

[0050] Specifically, the oil chambers 400 of the two interface parts 2 and the oil supply passages 2002 are connected in series or in parallel.

[0051] In some embodiments, there are multiple oil outlets 2122, and the multiple oil outlets 2122 are distributed in a circular manner with equal angles. Figure 3 As shown, multiple oil outlets 2122 are distributed in a ring shape on the mating surface 211 with the center of the mating surface 211 as the center. The angle between any two adjacent oil outlets 2122 and the center of the mating surface 211 is α, and the values of each α are equal. Multiple oil outlets 2122 increase the efficiency of lubricating oil flowing to the mating surface 211, increase the amount of lubricating oil on the mating surface 211, and multiple oil outlets 2122 are distributed in a ring at equal angles, so that the oil outlets 2122 are evenly distributed in the circumferential direction of the mating surface 211, and the lubricating oil is evenly distributed in the circumferential direction of the mating surface 211, thereby increasing the contact area between the lubricating oil and the mating surface 211 and the half-shaft gear gasket, thereby further improving the active lubrication effect of the differential assembly 1000 of the embodiment of the utility model on the mating surface 211 and the half-shaft gear gasket, further reducing the problem of insufficient lubrication of the mating surface 211 and the half-shaft gear gasket, thereby further reducing the occurrence of abnormal noise in the differential assembly 1000, further improving the NVH performance and durability of the differential assembly 1000, and further improving the ride comfort of the vehicle.

[0052] In some embodiments, the distances between two adjacent oil outlets 2122 and the center of the shoulder ring segment 21 are different, so that the oil outlets 2122 are more evenly distributed in the radial direction of the mating surface 211, and the lubricating oil is more evenly distributed in the radial direction of the mating surface 211, thereby further improving the uniformity of the distribution of the lubricating oil on the mating surface 211, further increasing the contact area between the lubricating oil and the mating surface 211 and the half-shaft gear gasket, thereby further improving the active lubrication effect between the mating surface 211 and the half-shaft gear gasket of the differential assembly 1000 of the embodiment of the utility model, further reducing the problem of insufficient lubrication of the mating surface 211 and the half-shaft gear gasket, thereby further reducing the occurrence of abnormal noise in the differential assembly 1000, further improving the NVH performance and durability of the differential assembly 1000, and further improving the ride comfort of the vehicle.

[0053] In some embodiments, see Figure 3 The multiple oil outlets 2122 are arranged in a circular array, and the line connecting the centers of the multiple oil outlets 2122 forms a sine curve. In other words, the absolute value of the difference between the radial lines of two adjacent oil outlets 2122 (i.e., the line connecting the oil outlets 2122 and the centers of the shoulder ring segment 21) is X. Each X value in the oil outlet group is the same, and X value is greater than 0. The multiple oil outlets 2122 are more evenly distributed in the radial direction of the shoulder ring segment 21, so that when the mating surface 211 and the half-shaft gear gasket rub against each other, the lubricating oil is more evenly distributed in the radial direction on the mating surface 211 driven by the half-shaft gear gasket, thereby increasing the effective contact area between the lubricating oil and the mating surface 211 and the half-shaft gear gasket, thereby further improving the active lubrication effect of the differential assembly 1000 of the embodiment of the utility model on the mating surface 211 and the half-shaft gear gasket, further reducing the problem of insufficient lubrication of the mating surface 211 and the half-shaft gear gasket, thereby further reducing the occurrence of abnormal noise in the differential assembly 1000, further improving the NVH performance and durability of the differential assembly 1000, and further improving the ride comfort of the vehicle.

[0054] exist Figure 3 In the embodiment, the number of oil outlet groups is 4, the number of oil outlet ports 2122 is 16, and the number of oil outlet ports 2122 in each oil outlet group is 4.

[0055] In some embodiments, there are multiple oil inlets 2121 , and the multiple oil inlets 2121 are connected to the multiple oil outlets 2122 in a one-to-one correspondence. In other words, the number of oil inlets 2121 and oil outlets 2122 is the same, and each oil inlet 2121 is connected to one oil outlet 2122 . The multiple oil inlets 2121 are distributed in a circular shape at equal angles, thereby shortening the path distance between each oil outlet 2122 and the oil inlet 2121, shortening the path of oil flowing from the oil supply passage 2002 to the mating surface 211, thereby ensuring the oil outlet efficiency of each oil outlet 2122, ensuring the uniformity of the oil outlet volume of each oil outlet 2122, ensuring the uniformity of the lubricating oil distribution on the mating surface 211, and ensuring the active lubrication effect between the mating surface 211 and the half-shaft gear gasket, thereby further reducing the problem of insufficient lubrication of the mating surface 211 and the half-shaft gear gasket, thereby further reducing the occurrence of abnormal noise in the differential assembly 1000, further improving the NVH performance and durability of the differential assembly 1000, and further improving the ride comfort of the vehicle.

[0056] In some embodiments, as Figure 4 and Figure 6 As shown, the oil passage 212 includes a radial section 2123 and an axial section 2124. The radial section 2123 extends radially along the shoulder ring segment 21. A port on the outer circumference of the shoulder ring segment 21 forms an oil inlet 2121. The axial section 2124 communicates with the radial section 2123 and extends axially along the shoulder ring segment 21. A port on the mating surface 211 forms an oil outlet 2122. The radial section 2123 on the outer circumference of the shoulder ring segment 21 and the axial section 2124 on the mating surface 211 are both conveniently arranged, reducing the manufacturing difficulty and cost of the oil passage 212, thereby further reducing the cost and manufacturing difficulty of the differential assembly 1000 according to the present invention.

[0057] The electric drive assembly of an embodiment of the present utility model is described below.

[0058] The electric drive assembly of the embodiment of the present invention includes the differential assembly 1000 of any of the above embodiments.

[0059] Therefore, the electric drive assembly of the embodiment of the present invention can actively lubricate the half-shaft gear gasket and the mating surface, reducing abnormal noise when the vehicle turns.

[0060] The following describes a vehicle according to an embodiment of the present invention.

[0061] The vehicle of the embodiment of the present invention includes the electric drive assembly of any one of the above embodiments.

[0062] In some other embodiments, a vehicle includes any of the above-described differential assemblies.

[0063] In some other embodiments, a vehicle includes any of the above-described differential housings.

[0064] Therefore, the vehicle of the embodiment of the present invention can actively lubricate the space between the half-axle gear gasket and the mating surface 211, reducing the occurrence of abnormal noise when the vehicle turns, and has the advantage of good ride comfort.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0068] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0069] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0070] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A differential housing, characterized in that: include: cavity; cavity and An interface portion, the interface portion includes a shoulder ring segment and a journal segment, the shoulder ring segment is connected to the cavity portion, and one end of the shoulder ring segment in the axial direction has a mating surface for docking with the half-shaft gear gasket. The shoulder ring segment is provided with an oil channel, and the oil channel has an oil inlet and an oil outlet. The oil inlet is located on the outer surface of the differential case, and the oil outlet is located on the mating surface. The inner circumferential surface of the shoulder ring segment is connected to the journal segment.

2. The differential case according to claim 1, characterized in that The oil inlet is arranged on the outer circumferential surface of the shoulder ring segment, and the outer circumferential surface of the shoulder ring segment is provided with first sealing ring grooves on both sides of the oil inlet.

3. The differential case according to claim 1 or 2, characterized in that: There are multiple oil outlets, and the multiple oil outlets are distributed in a circular manner with equal angles.

4. The differential case according to claim 3, characterized in that The distances between two adjacent oil outlets and the center of the shoulder ring segment are different.

5. The differential case according to claim 4, characterized in that: The plurality of oil outlets are arranged in a circular array, and a line connecting the centers of the plurality of oil outlets forms a sine curve.

6. The differential case according to claim 3, characterized in that There are multiple oil inlets, and the multiple oil inlets are connected to the multiple oil outlets in a one-to-one correspondence.

7. The differential case according to claim 6, characterized in that The oil passage includes a radial section and an axial section. The radial section extends radially along the shoulder ring section. The port of the radial section on the outer peripheral surface of the shoulder ring section forms the oil inlet. The axial section is communicated with the radial section. The axial section extends axially along the shoulder ring section. The port of the axial section on the mating surface forms the oil outlet.

8. The differential case according to claim 1, wherein: The cavity portion has a large end and a small end, the large end and the small end are respectively located on two opposite sides of the cavity portion, and both the large end and the small end are connected to the interface portion.

9. A differential assembly, characterized in that: It comprises an oil supply passage and the differential case according to any one of claims 1 to 8, wherein the oil supply passage is communicated with the oil inlet.

10. The differential assembly according to claim 9, characterized in that: It comprises a main housing, which is sleeved on the outside of the differential housing and is provided with the oil supply passage.

11. The differential assembly according to claim 10, characterized in that: The oil inlet is provided on the outer circumference of the shoulder ring segment, and the outer circumference of the shoulder ring segment is provided with a first sealing ring groove on both sides of the oil inlet; The main housing is provided with a second sealing ring groove, which corresponds to the first sealing ring groove in the radial direction of the shoulder ring segment. The outlet of the oil supply passage is located on the inner side surface of the main housing and between the two second sealing ring grooves. The differential assembly further includes a sealing ring, one side of which is fitted in the first sealing ring groove, and the other side of which is fitted in the second sealing ring groove. The main housing and the shoulder ring segment form an oil chamber in the area between the first sealing ring groove and the second sealing ring groove.

12. An electric drive assembly, characterized in that: The differential assembly comprises the differential assembly according to any one of claims 9 to 11.

13. A vehicle, characterized in that: It includes the electric drive assembly according to claim 12, or the differential assembly according to claim 9, or the differential housing according to any one of claims 1-8.

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