Differential mechanism and automobile

Abstract

The utility model discloses a differential mechanism and an automobile, relates to the technical field of differential mechanisms, and aims to solve the problem of loud noise in the meshing rotation process of a planetary gear and a half shaft bevel gear. The differential mechanism comprises a differential shell, wherein a containing cavity is formed in the differential shell; the mandrel is arranged in the containing cavity and fixedly connected with the differential shell, and the axis of the mandrel is parallel to the first direction. The planetary gear comprises a main body part and a supporting ring which are connected and arranged on the mandrel in a sleeving mode, and the supporting ring is arranged between the main body part and the differential shell in the first direction; the bearing assembly is arranged on the peripheral side of the supporting ring in a sleeving mode and connected between the differential shell and the planetary gear in a rolling mode. The differential shell is used for reducing noise generated when the planetary gear rotates and reducing abrasion between the planetary gear and the differential shell.

Description

Technical Field

[0001] The present application relates to the technical field related to differentials, and in particular to a differential and a car. Background Art

[0002] A car's differential enables the left and right (or front and rear) drive wheels to rotate at different speeds. It primarily consists of left and right axle gears, two planetary gears, and a gear carrier. Its function is to ensure that the left and right wheels roll at different speeds when the car is turning or driving on uneven surfaces, ensuring pure rolling motion of the drive wheels on both sides. The differential is designed to adjust the speed difference between the left and right wheels. In four-wheel drive, all four wheels must be connected to drive them. If the four wheels were mechanically connected, the car would not rotate at the same speed when cornering. To ensure that the car's rotation speed is roughly consistent when cornering, a center differential is required to adjust the speed difference between the front and rear wheels.

[0003] In the prior art, the differential includes a differential case and planetary gears and half-shaft bevel gears arranged in the differential case. The planetary gears and the differential case are connected by spherical washers, and the half-shaft bevel gears and the differential case are connected by flat washers. As a result, a large noise is generated during the meshing and rotation of the planetary gears and the half-shaft bevel gears. Utility Model Content

[0004] The present application provides a differential and a car, which can reduce the noise generated when the planetary gears rotate and the wear between the planetary gears and the differential case while simplifying the assembly difficulty of the differential.

[0005] To achieve the above-mentioned purpose, the differential provided in the present application has a first direction, a second direction, and a third direction intersecting each other, and the differential includes:

[0006] a differential case, wherein a receiving cavity is formed in the differential case;

[0007] a core shaft, disposed in the receiving cavity and fixedly connected to the differential case, wherein the axis of the core shaft is parallel to the first direction;

[0008] a planetary gear, comprising a main body and a support ring connected and sleeved on the core shaft, wherein the support ring is arranged between the main body and the differential case along the first direction;

[0009] The bearing assembly is sleeved on the outer circumference of the support ring and is rollingly connected between the differential case and the planetary gear.

[0010] In some embodiments of the present application, the support ring has a first side and a second side arranged opposite to each other, the first side is connected to the main body, the second side is close to the differential case, and from the first side to the second side, the bearing assembly includes a first rolling body and a spherical gasket sequentially arranged on the outer circumference of the support ring.

[0011] In some embodiments of the present application, the support ring has a first side and a second side arranged opposite to each other, the first side is connected to the main body, the second side is close to the differential case, and from the first side to the second side, the bearing assembly includes a first rolling body, a working gasket and a spherical gasket sequentially arranged on the outer periphery of the support ring.

[0012] In some embodiments of the present application, a first limiting portion is provided in the accommodating cavity, and a second limiting portion is provided on the outer peripheral side of the working gasket. The first limiting portion and the second limiting portion are connected to limit the rotation of the working gasket relative to the differential case.

[0013] In some embodiments of the present application, the first limiting portion includes two bosses arranged on opposite sides of the core shaft in the second direction, the working gasket is arranged between the two bosses, and the working gasket includes two side walls arranged opposite to each other along the second direction, each of the bosses has an inner wall facing the side wall, and the planes where the two side walls and the two inner walls are located are perpendicular to the second direction.

[0014] In some embodiments of the present application, the hardness of the working gasket is higher than that of the spherical gasket, and / or the surface roughness of the working gasket is lower than that of the spherical gasket.

[0015] In some embodiments of the present application, the differential further comprises:

[0016] a side bevel gear disposed in the receiving cavity and meshing with the planetary gears, wherein the axis of the side bevel gear is parallel to the second direction, and an annular boss is formed on a portion of the side bevel gear close to the differential case along the second direction;

[0017] The friction reducing structure is sleeved on the outer periphery of the annular boss and is connected to the differential case and the half-shaft bevel gear.

[0018] In some embodiments of the present application, the friction-reducing structure is a flat washer, or the friction-reducing structure includes a flat washer and a second rolling element, and the second rolling element is provided between the flat washer and the half-shaft bevel gear.

[0019] In some embodiments of the present application, the differential case is provided with hollow areas on both sides in the third direction, and the hollow areas communicate with the receiving cavity and the outside of the differential case.

[0020] In some embodiments of the present application, the differential case has two connecting portions arranged opposite to each other in the second direction, and a base portion connected between the connecting portions;

[0021] The differential further comprises:

[0022] A half-shaft bevel gear is disposed in the receiving cavity and meshes with the planetary gear;

[0023] Notches are provided on the end faces on the opposite sides of the two connecting parts, and through holes are provided in the two connecting parts. The axes of the through holes coincide with the axes of the half-shaft bevel gears, and oil guide grooves are provided on the hole walls of the through holes. The notches can guide lubricating oil into the oil guide grooves.

[0024] In some embodiments of the present application, the differential case has two connecting parts arranged opposite to each other in the second direction, and a base part connected between the connecting parts, and the base part is provided with through holes on two side parts arranged opposite to each other in the first direction, and the two ends of the core shaft are respectively passed through the two through holes, and the outer periphery of the base part is provided with a flange surrounding it, and the flange is located on one side of the through hole in the second direction.

[0025] In some embodiments of the present application, the flange divides the base portion into a first area and a second area along the second direction, the two through-holes are located in the first area, and the base portion is provided with reinforcing ribs on the outer peripheral side wall of the second area.

[0026] In some embodiments of the present application, the reinforcing ribs include a plurality of reinforcing ribs, and the plurality of reinforcing ribs are evenly arranged on the outer peripheral side wall of the base portion in the second area around the axis of the rotating shaft.

[0027] In some embodiments of the present application, a recessed area that is recessed toward the base portion is provided on the outer peripheral side wall of the flange.

[0028] On the other hand, the present application also provides a car, which includes the differential described in any of the above technical solutions.

[0029] The above technical solution of this application has at least the following beneficial effects:

[0030] By providing a support ring at one end of the main body of the planetary gear, the present invention allows the bearing assembly to be sleeved onto the outer circumference of the support ring during assembly, allowing the planetary gear and bearing assembly to form a single, integral assembly for subsequent differential assembly, thus reducing the difficulty of installing the bearing assembly. Furthermore, the bearing assembly converts surface friction between the planetary gear and the differential case into rolling friction, thereby reducing noise generated by the rotation of the planetary gear and wear between the planetary gear and the differential case. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a perspective view of a differential case of a differential in an embodiment of the present application;

[0033] Figure 2 is a cross-sectional view of a differential in Example 1 of the present application;

[0034] Figure 3 This is a partial cross-sectional view of a differential in Example 1 of the present application;

[0035] Figure 4 It is a partial cross-sectional view of another differential in Example 1 of the present application;

[0036] Figure 5 This is a partial view of the relative position of another working gasket and the boss in Example 1 of this application;

[0037] Figure 6 is a cross-sectional view of the differential in the second embodiment of the present application;

[0038] Figure 7 It is a cross-sectional view of the differential in the third embodiment of the present application.

[0039] The main reference numerals in the drawings of this application specification are described as follows:

[0040] 1-differential case; 11-receiving cavity; 111-boss; 112-inner wall; 12-hollow area; 13-connecting portion; 131-notch; 132-through hole; 1321-oil guide groove; 14-base portion; 141-perforation; 142-flange; 1421-opening; 1422-recessed area; 143-reinforcement rib;

[0041] 2- mandrel;

[0042] 3- planetary gear; 31- main body; 32- support ring;

[0043] 4-bearing assembly; 41-first rolling element; 42-working gasket; 421-side wall; 43-spherical gasket;

[0044] 5-Axle bevel gear;

[0045] 6-friction reduction structure; 61-flat washer; 62-second rolling element;

[0046] Z-first direction; X-second direction; Y-third direction. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0048] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 cannot be understood as a limitation on this application.

[0049] 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 one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0051] This application provides a differential and an automobile, each of which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the description of each embodiment has its own emphasis. For portions not detailed in one embodiment, please refer to the relevant descriptions of other embodiments.

[0052] A car's differential enables the left and right (or front and rear) drive wheels to rotate at different speeds. It primarily consists of left and right axle gears, two planetary gears, and a gear carrier. Its function is to ensure that the left and right wheels roll at different speeds when the car is turning or driving on uneven surfaces, ensuring pure rolling motion of the drive wheels on both sides. The differential is designed to adjust the speed difference between the left and right wheels. In four-wheel drive, all four wheels must be connected to drive them. If the four wheels were mechanically connected, the car would not rotate at the same speed when cornering. To ensure that the car's rotation speed is roughly consistent when cornering, a center differential is required to adjust the speed difference between the front and rear wheels.

[0053] Hereinafter, the same structure of the differential in each embodiment of the present application will be first described in detail.

[0054] Figure 1 is a three-dimensional diagram of the differential case of the differential in the embodiment of the present application, Figure 2 : is a cross-sectional view of a differential in an embodiment of the present application. Figure 1 and Figure 2 The differential provided in this application has a first direction Z, a second direction X and a third direction Y that intersect with each other.

[0055] The differential includes a differential case 1 , a spindle 2 , planetary gears 3 and a bearing assembly 4 .

[0056] A receiving cavity 11 is formed in the differential case 1 , and the receiving cavity 11 can receive the core shaft 2 , the planetary gear 3 and the bearing assembly 4 in the differential case 1 .

[0057] The core shaft 2 is disposed in the receiving cavity 11 and fixedly connected to the differential case 1 . The axis a of the core shaft 2 is parallel to the first direction. The core shaft 2 is used to rotatably support the planetary gear 3 in the receiving cavity 11 of the differential case 1 .

[0058] The planetary gear 3 includes a main body 31 and a support ring 32 connected and sleeved on the core shaft 2. Along the first direction, the support ring 32 is arranged between the main body 31 and the differential case 1. For example, the planetary gear 3 has an integral main body 31 and support ring 32.

[0059] The bearing assembly 4 is sleeved on the outer circumference of the support ring 32 and is rollingly connected between the differential case 1 and the planetary gear 3 .

[0060] In this technical solution, the present application provides a support ring 32 at one end of the main body 31 of the planetary gear 3. During the assembly process, the bearing assembly 4 can be first sleeved on the outer circumference of the support ring 32, so that the planetary gear 3 and the bearing assembly 4 form an integral assembly to complete the subsequent assembly of the differential, thereby reducing the difficulty of installing the bearing assembly 4. In addition, the bearing assembly 4 can convert the surface friction between the planetary gear 3 and the differential case 1 into rolling friction, thereby reducing the noise generated by the rotation of the planetary gear 3 and the wear between the planetary gear 3 and the differential case 1.

[0061] Furthermore, by adding a support ring 32 structure to the end of the main body 31 of the planetary gear 3, the contact area between the planetary gear 3 and the core shaft 2 can be increased. In other words, the original contact area between the planetary gear 3 and the core shaft 2 is the contact area between the main body 31 and the core shaft 2. After adding the support ring 32 structure to the end of the main body 31 of the planetary gear 3, the contact area between the planetary gear 3 and the core shaft 2 is the sum of the contact area between the main body 31 and the core shaft 2 and the contact area between the support ring 32 and the core shaft 2, thereby increasing the contact area between the planetary gear 3 and the core shaft 2. The increase in contact area can disperse the load and reduce the contact stress between the planetary gear 3 and the core shaft 2. This helps to reduce local stress concentration, lower the risk of fatigue failure of parts, and extend the service life of the planetary gear 3 and the core shaft 2.

[0062] For example, there are two planetary gears 3, both of which are sleeved on the core shaft 2. One of the two planetary gears 3 is close to the top of the differential case 1, and the other planetary gear 3 is close to the bottom of the differential case 1. Both planetary gears have a main body 31 and a support ring 32, and both support rings 32 are equipped with bearing assemblies 4. The bearing assemblies 4 are used to rotatably connect the corresponding planetary gears 3 and the differential case 1.

[0063] To facilitate installation of various components within the differential case 1, the differential case 1 is provided with hollow areas 12 on both sides thereof in the third direction Y. The hollow areas 12 connect the receiving cavity 11 with the exterior of the differential case 1. Thus, during assembly of the differential, assemblers or assembly tools can reach into the receiving cavity 11 through the hollow areas 12.

[0064] Please continue to refer to Figure 1 and Figure 2 The differential case 1 has two connecting portions 13 arranged opposite to each other in the second direction X, and a base portion 14 connected between the connecting portions 13 .

[0065] The differential also includes side bevel gears 5, which are located in the receiving cavity 11 and mesh with the planetary gears 3. Notches 131 are provided on the opposite end faces of the two connecting portions 13. Each connecting portion 13 has a through hole 132, whose axis coincides with the axis of the side bevel gears 5. The walls of the through holes 132 are provided with oil guide grooves 1321. Notches 131 allow lubricating oil to be directed into the oil guide grooves 1321, thereby lubricating the rotating shaft and the side bevel gears 5 mounted thereon, reducing friction and wear between the two, as well as between the rotating shaft and the connecting portion 13.

[0066] It should be noted that the base portion 14 has a receiving cavity 11 formed therein. The two connecting portions 13 are provided with through-holes 132 for the half-shafts to pass through. Both through-holes 132 are connected to the receiving cavity 11. Oil guide grooves 1321 formed on the walls of the through-holes 132 provide a flow path for the lubricating oil introduced through the notches 131. For example, the oil guide grooves 1321 are spiral in shape.

[0067] In some embodiments, the differential case 1 has two connecting portions 13 disposed opposite each other in the second direction X, and a base portion 14 connected between the connecting portions 13. The base portion 14 has through-holes 141 on two opposing sides disposed in the first direction Z. The two ends of the core shaft 2 are respectively inserted into the two through-holes 141. A flange 142 is provided around the outer periphery of the base portion 14. The flange 142 is located on one side of the through-hole 141 in the second direction X, thereby achieving a fixed connection between the differential case 1 and an external device. For example, the flange 142 has an opening 1421 extending through it in the second direction X. Connecting bolts are threaded through the opening 1421 of the flange 142 of the differential case 1 to connect the differential and the external device, ensuring a reliable connection between the two.

[0068] Based on the above embodiment, the flange 142 divides the base portion 14 into a first region and a second region along the second direction X. The two through-holes 141 are located in the first region, and the base portion 14 is provided with reinforcing ribs 143 on the outer peripheral sidewalls of the second region. This arrangement, by adding reinforcing ribs 143, increases the rigidity and strength of the outer peripheral sidewalls of the base portion 14 in the second region, thereby improving the overall structural strength of the differential. This is particularly important in applications subject to high loads and vibration, as it prevents deformation or cracking of the differential during operation.

[0069] Based on the above embodiment, multiple reinforcing ribs 143 are evenly arranged on the outer peripheral sidewall of the second region of the base portion 14 around the axis b of the side bevel gear 5. This helps reduce stress concentration and prevents deformation and cracking caused by localized excessive stress. Furthermore, the provision of multiple reinforcing ribs 143 effectively suppresses the occurrence and propagation of vibration. They absorb and disperse vibration energy, reducing vibration during operation of the differential and improving its vibration resistance.

[0070] Please continue to refer to Figure 1 The outer sidewall of the flange 142 is provided with a recessed area 1422 that is recessed toward the base portion 14, thereby reducing weight. The differential case 1 is a one-piece structure, meaning that the components of the differential case 1 cannot be disassembled, as disassembly would inevitably cause irreversible damage to the mechanical structure of the differential case 1.

[0071] The following is a detailed introduction to the different structures of the differential in each embodiment of the present application.

[0072] Example 1

[0073] like Figure 2 and Figure 3 As shown, the support ring 32 has opposing first and second sides. The first side is connected to the main body 31, while the second side is adjacent to the differential case 1. From the first side to the second side, the bearing assembly 4 comprises a first rolling element 41, a working spacer 42, and a spherical spacer 43, which are sequentially sleeved around the outer circumference of the support ring 32. The spherical spacer 43 does not require high strength, so it is made of powder metallurgy material to achieve rapid prototyping, improve precision, and reduce costs. The working spacer 42 contacts and rotates relative to the first rolling element 41, while the first rolling element 41 assembly rotates relative to the planetary gear 3. For example, the spherical spacer 43 has a spherical upper surface and a flat lower surface. The spherical surface portion contacts and remains stationary relative to the differential case 1, while the flat surface portion contacts and remains stationary relative to the working spacer 42. The spherical spacer 43 converts the inner spherical surface of the differential case 1 into a flat surface, providing filling and support. A boss 111 is provided within the receiving cavity 11 to limit the rotation of the working spacer 42.

[0074] Based on the above examples, please refer to Figure 4 and Figure 5 By setting a limiting structure between the receiving cavity 11 and the working gasket 42, the working gasket 42 is restricted from rotating relative to the differential case 1 around the support ring 32, thereby further improving the service life and reliability of the bearing assembly 4.

[0075] Specifically, a first limiting portion is provided in the accommodating cavity 11 , and a second limiting portion is provided on the outer circumference of the working gasket 42 . The first limiting portion and the second limiting portion are connected to limit the working gasket 42 from rotating relative to the differential case 1 .

[0076] For example, the first limiting portion includes two bosses 111 arranged on opposite sides of the core shaft 2 in the second direction X, and the working gasket 42 is arranged between the two bosses 111. The working gasket 42 includes two side walls 421 arranged opposite to each other along the second direction X. Each boss 111 has an inner wall 112 facing the side wall 421. The planes where the two side walls 421 and the two inner walls 112 are located are perpendicular to the second direction X, ensuring that the limiting structure between the two is easy to implement.

[0077] Alternatively, the working gasket 42 includes two side walls 421 arranged opposite to each other along the second direction X, the second limiting portion is a limiting column arranged on the two side walls 421 of the working gasket 42, and the first limiting portion includes two limiting grooves arranged in the receiving cavity 11, and the limiting column is inserted in the limiting groove to limit the rotation between the two.

[0078] In some embodiments, the hardness of the working washer 42 is higher than that of the spherical washer 43, and / or the surface roughness of the working washer 42 is lower than that of the spherical washer 43. This configuration can reduce friction and wear between the working washer 42 and the first rolling element 41, thereby increasing the service life of the bearing assembly 4.

[0079] In an embodiment where the differential also includes side bevel gears 5, a friction-reducing structure 6 is provided between the side bevel gears 5 and the differential case 1. This friction-reducing structure 6 is sleeved around the outer periphery of the annular boss 51 and connects the differential case 1 and the side bevel gears 5 to reduce wear during relative rotation. In this embodiment, the friction-reducing structure 6 is a flat washer 61.

[0080] Example 2

[0081] like Figure 6 As shown, the only difference between Example 2 and Example 1 is that, from the first side to the second side, the bearing assembly 4 includes a first rolling element 41 and a spherical washer 43 sequentially sleeved on the outer circumference of the support ring 32. In other words, in this embodiment, the working washer 42 is removed, thereby reducing the manufacturing cost of the bearing assembly 4.

[0082] Example 3

[0083] like Figure 7 As shown, the only difference between Example 3 and Example 1 is that: in this embodiment, the friction reducing structure 6 includes a flat washer 61 and a second rolling element 62, the second rolling element 62 is provided between the flat washer 61 and the half-shaft bevel gear 5, and the side of the flat washer 61 facing away from the second rolling element 62 is connected to the differential case 1, thereby realizing a rolling connection between the half-shaft bevel gear 5 and the differential case 1, which is beneficial to further reduce the wear when the two rotate relative to each other.

[0084] In some embodiments of the present application, the present application also provides a car, which includes a differential of any of the above-mentioned technical solutions. Since the differential set in the car and the differential in the above-mentioned technical solution have the same structure, the two can solve the same technical problems and achieve the same technical effects.

[0085] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0086] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. The content of this specification should not be understood as limiting the present application.

Claims

1. A differential, characterized in that: The differential has a first direction, a second direction and a third direction intersecting in pairs, and the differential includes: a differential case, wherein a receiving cavity is formed in the differential case; a core shaft, disposed in the receiving cavity and fixedly connected to the differential case, wherein the axis of the core shaft is parallel to the first direction; a planetary gear, comprising a main body and a support ring connected and sleeved on the core shaft, wherein the support ring is arranged between the main body and the differential case along the first direction; The bearing assembly is sleeved on the outer circumference of the support ring and is rollingly connected between the differential case and the planetary gear.

2. The differential according to claim 1, characterized in that The support ring has a first side and a second side arranged opposite to each other, the first side is connected to the main body, and the second side is close to the differential case. From the first side to the second side, the bearing assembly includes a first rolling body and a spherical gasket sequentially sleeved on the outer circumference of the support ring.

3. The differential according to claim 1, characterized in that The support ring has a first side and a second side arranged opposite to each other, the first side is connected to the main body, and the second side is close to the differential case. From the first side to the second side, the bearing assembly includes a first rolling body, a working gasket and a spherical gasket sequentially sleeved on the outer circumference of the support ring.

4. The differential according to claim 3, characterized in that A first limiting portion is provided in the receiving cavity, and a second limiting portion is provided on the outer circumference of the working gasket. The first limiting portion and the second limiting portion are connected to limit the rotation of the working gasket relative to the differential case.

5. The differential according to claim 4, characterized in that The first limiting portion includes two bosses arranged on opposite sides of the core shaft in the second direction, and the working gasket is arranged between the two bosses. The working gasket includes two side walls arranged opposite to each other along the second direction, and each of the bosses has an inner wall facing the side wall, and the planes where the two side walls and the two inner walls are located are perpendicular to the second direction.

6. The differential according to claim 3, characterized in that The hardness of the working gasket is higher than that of the spherical gasket, and / or the surface roughness of the working gasket is lower than that of the spherical gasket.

7. The differential according to claim 1, characterized in that The differential further comprises: a side bevel gear disposed in the receiving cavity and meshing with the planetary gears, wherein the axis of the side bevel gear is parallel to the second direction, and an annular boss is formed on a portion of the side bevel gear close to the differential case along the second direction; The friction reducing structure is sleeved on the outer periphery of the annular boss and is connected to the differential case and the half-shaft bevel gear.

8. The differential according to claim 7, characterized in that The friction reducing structure is a flat washer, or the friction reducing structure includes a flat washer and a second rolling element, and the second rolling element is provided between the flat washer and the half-shaft bevel gear.

9. The differential according to claim 1, wherein: The differential case is provided with hollow areas on both sides in the third direction, and the hollow areas communicate with the accommodating cavity and the outside of the differential case.

10. The differential according to claim 1, wherein: The differential case has two connecting portions arranged opposite to each other in the second direction, and a base portion connected between the connecting portions; The differential further comprises: A half-shaft bevel gear is disposed in the receiving cavity and meshes with the planetary gear; Notches are provided on the end faces on the opposite sides of the two connecting parts, and through holes are provided in the two connecting parts. The axes of the through holes coincide with the axes of the half-shaft bevel gears, and oil guide grooves are provided on the hole walls of the through holes. The notches can guide lubricating oil into the oil guide grooves.

11. The differential according to claim 1, wherein: The differential case has two connecting parts arranged opposite to each other in the second direction, and a base part connected between the connecting parts. The base part is provided with through holes on two side parts arranged opposite to each other in the first direction. The two ends of the core shaft are respectively passed through the two through holes. The outer periphery of the base part is provided with a flange surrounding it, and the flange is located on one side of the through hole in the second direction.

12. The differential according to claim 11, characterized in that The flange divides the base into a first area and a second area along a second direction. The two through holes are located in the first area. The base is provided with reinforcing ribs on the outer peripheral side wall of the second area.

13. The differential according to claim 12, characterized in that The reinforcement ribs include a plurality of reinforcement ribs, and the plurality of reinforcement ribs are evenly arranged on the outer peripheral side wall of the base portion in the second area around the axis of the rotating shaft.

14. The differential according to any one of claims 11 to 13, characterized in that: The outer peripheral side wall of the flange is provided with a recessed area recessed toward the base portion.

15. An automobile, characterized in that: The automobile includes the differential according to any one of claims 1 to 14.

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