Differential assembly

Abstract

The utility model provides a differential mechanism assembly, and relates to the field of differential mechanisms, the differential mechanism assembly comprises a differential mechanism shell, two half axle gears, two first planetary gears, two second planetary gears, a first planetary shaft and two second planetary shafts, the differential mechanism shell is provided with a mounting cavity and two assembling holes, and the mounting cavity is provided with two first limiting surfaces; the half axle gear comprises a tooth surface and a second limiting surface, and the second limiting surface is a plane; the two half axle gears are both installed in the installation cavity, and the two first limiting faces abut against the two second limiting faces correspondingly. The first planet shaft and the two second planet shafts are all installed on the differential mechanism shell. The two first planetary gears are both installed on the first planetary shaft, and the two second planetary gears are installed on the two second planetary shafts respectively. The first planetary gear and the second planetary gear are meshed with the two half axle gears at the same time. The half axle gear is high in structural strength, and the differential assembly is stable and reliable in operation.

Description

Technical Field

[0001] The utility model relates to the field of differentials, in particular to a differential assembly. Background Art

[0002] The inter-axle differential is a mechanism that enables the left and right drive wheels to rotate at different speeds. The inter-axle differential is generally composed of left and right half-axle gears, two planetary gears and a gear rack. Its function is to adjust the speed difference between the left and right wheels when the car is turning or driving on uneven roads, so that the left and right wheels roll at different speeds, that is, to ensure that the drive wheels on both sides perform pure rolling motion.

[0003] The limiting structure between the half-axle gears and the differential housing of the existing inter-axle differential is a stepped structure, which results in a small thickness and low strength of some shaft sections of the half-axle gears. The shaft sections with smaller thickness of the half-axle gears are prone to deformation or breakage, affecting the operating reliability of the differential. Utility Model Content

[0004] The utility model aims to provide a differential assembly, which can improve the operating reliability of the differential by enhancing the structural strength of the half-axle gears.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a differential assembly, comprising:

[0007] A differential case, two side shaft gears, two first planetary gears, two second planetary gears, a first planetary shaft and two second planetary shafts, wherein the differential case has a mounting cavity and two assembly holes communicating with the mounting cavity, the two assembly holes are respectively used to penetrate corresponding side shafts, and the mounting cavity has two first limiting surfaces in the axial direction of the assembly hole; each of the side shaft gears includes a tooth surface and a second limiting surface opposite to the tooth surface, and the second limiting surface is set as a plane; the two side shaft gears are both mounted in the mounting cavity, and the two first limiting surfaces are respectively in contact with the two second limiting surfaces;

[0008] The first planetary shaft and the two second planetary shafts are both mounted on the differential case, the two second planetary shafts are both connected to the first planetary shaft and are cross-arranged; the two first planetary gears are both mounted on the first planetary shaft, and the two second planetary gears are respectively mounted on the two second planetary shafts; the first planetary gear and the second planetary gear are both meshed with the two half-shaft gears at the same time.

[0009] In an optional embodiment, the half-axle gear includes an integrated umbrella-shaped portion and an equal-diameter portion, the tooth surface is located on the end face of the umbrella-shaped portion away from the equal-diameter portion, and the outer diameter of the equal-diameter portion is equal at all locations in the axial direction of the equal-diameter portion; the second limiting surface is arranged at one end of the equal-diameter portion away from the umbrella-shaped portion.

[0010] Based on the above scheme, the structure of the half-axle gear is regular and easy to process and manufacture, and the thickness of the half-axle gear is basically equal, it is not easy to have weak areas, the overall structure has high strength and long service life.

[0011] In an optional embodiment, the differential assembly further includes a first gear washer, the first gear washer is clamped between the first limiting surface and the second limiting surface, and the first gear washer is provided with a first through hole for the half shaft to pass through.

[0012] Based on the above solution, by providing the first gear washer, the side gear contacts the first gear washer instead of directly contacting the differential case, and when the side gear rotates relative to the differential case, the differential case is not easily worn.

[0013] In an optional embodiment, an anti-rotation groove is provided on the first limiting surface, the first gear washer is clamped in the anti-rotation groove, and the first gear washer and the anti-rotation groove are relatively fixed in the circumferential direction of the first through hole.

[0014] Based on the above solution, the first gear washer is clamped in the anti-rotation groove, and the first gear washer is positioned by the anti-rotation groove, which is convenient for installation, and the installation position is accurate and reliable.

[0015] In an optional embodiment, the anti-rotation groove includes a main groove body and a snap-in groove body connected to the side of the main groove body; the first gear gasket includes a connected main body ring and a snap-in protrusion, and the snap-in protrusion is protruding on the circumferential surface of the main ring; the main body ring is snap-connected to the main groove body, and the snap-in protrusion is snap-connected to the snap-in groove body.

[0016] Based on the above solution, after the first gear washer is inserted into the anti-rotation groove, the first gear washer is firmly engaged with the anti-rotation groove, and the first gear washer basically does not rotate relative to the anti-rotation groove, thereby avoiding the first gear washer rotating relative to the differential case and causing wear of the differential case.

[0017] In an optional embodiment, the differential assembly further includes a connecting sleeve, and the first planetary shaft passes through the connecting sleeve; the two second planetary shafts are respectively inserted into both ends of the connecting sleeve, and the first planetary shaft is located between the two second planetary shafts.

[0018] Based on the above solution, the first planetary shaft and the two second planetary shafts are connected by a connecting sleeve, so that the connection strength between the first planetary shaft and the two second planetary shafts can be improved, and the relative position of the first planetary shaft and the second planetary shaft is more stable.

[0019] In an optional embodiment, a first fastener and two second fasteners are provided on the connecting sleeve, the first fastener passes through the first planetary shaft, and the two second fasteners pass through the two second planetary shafts respectively.

[0020] Based on the above scheme, after the first planetary shaft and the second planetary shaft are matched with the connecting sleeve, the first planetary shaft and the connecting sleeve are locked by the first fastener, and the second planetary shaft and the connecting sleeve are locked by the second fastener, so as to further improve the firmness of the first planetary shaft and the second planetary shaft.

[0021] In an optional embodiment, the outer circumferential surface of the first planetary shaft is provided with two relatively arranged positioning grooves, the two second planetary shafts are respectively inserted into the two positioning grooves, and the ends of the second planetary shafts are abutted against the bottom walls of the corresponding positioning grooves.

[0022] Based on the above scheme, after the first planetary shaft is passed through the connecting sleeve, the two second planetary shafts are passed through the two ends of the connecting sleeve, and the ends of the second planetary shafts can be plugged into the corresponding positioning grooves to improve the matching firmness of the first planetary shaft and the second planetary shaft.

[0023] In an optional embodiment, the differential assembly also includes a second gear washer for passing through the first planetary shaft or the second planetary shaft, and the second gear washer is arranged between the first planetary gear and the differential housing or between the second planetary gear and the differential housing.

[0024] Based on the above solution, the first planetary gear or the second planetary gear is in contact with the differential housing through the second gear gasket, and when the first planetary gear and the second planetary gear rotate, it is not easy to cause wear of the differential housing.

[0025] In an optional embodiment, the differential assembly further includes a toothed portion connected to the differential housing and configured to mesh with an input gear shaft.

[0026] Based on the above scheme, the gear and the differential housing are split structures, and the two are assembled together after being independently processed, which reduces the processing difficulty, improves the processing accuracy, and improves the assembly quality.

[0027] The beneficial effects of the embodiments of the utility model are:

[0028] In summary, the differential assembly provided in this embodiment sets the surface where the side gear abuts against the differential housing, i.e., the second limiting surface, as a plane. Compared with the design of the step surface of the side gear in the prior art, there is no need to open a notch on the second limiting surface to form a step structure, and thus there is no avoidance space formed by the step surface, and the thickness of the side gear section will not be reduced due to the avoidance space. The thickness of the side gear is relatively large in the axial direction, wherein the thickness of the side gear can be understood as the radial dimension of the side gear. Since the side gear does not have a notch structure, the side gear is not prone to stress concentration, cracking or breaking at the connection, the entire side gear has high strength, is not prone to bending deformation during service, and has high operational reliability of the differential assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of a differential assembly of an embodiment of the utility model;

[0031] Figure 2 It is a structural schematic diagram of a differential housing of an embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the half-shaft gear of an embodiment of the utility model;

[0033] Figure 4 It is a structural schematic diagram of the first gear gasket of an embodiment of the utility model.

[0034] icon:

[0035] 100-differential housing; 101-installation cavity; 102-assembly hole; 103-fixing hole; 104-anti-rotation groove; 110-first limiting surface; 120-boss; 200-semi-axle gear; 210-second limiting surface; 220-umbrella-shaped portion; 230-equal diameter portion; 300-second planetary gear; 400-first planetary shaft; 410-positioning groove; 500-second planetary shaft; 600-toothed; 700-first gear gasket; 710-main body ring; 720-clamping protrusion; 800-second gear gasket; 900-connecting sleeve; 001-first fastener; 002-second fastener. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the prior art, such as Figure 1 As shown, the end face of the side gear 200 is set as a stepped surface, and correspondingly, a stepped surface is set at a corresponding position on the inner wall surface of the differential housing 100, and the two stepped surfaces cooperate to achieve the axial positioning of the side gear 200 and the differential housing 100 in the side gear 200. Since the side gear 200 has a stepped surface, the outer diameter of a part of the shaft section of the side gear 200 is reduced, and the side gear 200 is a hollow structure and needs to be passed through by the side shaft. Therefore, under the premise that the diameter of the side shaft remains unchanged, the wall thickness of the side gear 200 where the stepped surface is set is reduced, and the structural strength of the side gear 200 is affected, thereby affecting the operational reliability of the differential assembly.

[0043] In view of this, the designer provides a differential assembly, which improves the operational reliability of the differential assembly by enhancing the structural strength of the half-shaft gear 200.

[0044] Please combine Figure 1 In this embodiment, the differential assembly includes a differential case 100, two side shaft gears 200, two first planetary gears, two second planetary gears 300, a first planetary shaft 400 and two second planetary shafts 500. The differential case 100 has a mounting cavity 101 and two assembly holes 102 connected to the mounting cavity 101. The two assembly holes 102 are respectively used to penetrate corresponding side shafts. The mounting cavity 101 has two first limiting surfaces 110 in the axial direction of the assembly holes 102. Each side shaft gear 200 includes a tooth surface and a second limiting surface 210 opposite to the tooth surface. The second limiting surface 210 10 is set as a plane; the two half-shaft gears 200 are both installed in the installation cavity 101, and the two first limiting surfaces 110 are respectively abutted against the two second limiting surfaces 210; the first planetary shaft 400 and the two second planetary shafts 500 are both installed on the differential case 100, and the two second planetary shafts 500 are both connected to the first planetary shaft 400 and cross-arranged; the two first planetary gears are both installed on the first planetary shaft 400, and the two second planetary gears 300 are respectively installed on the two second planetary shafts 500; the first planetary gear and the second planetary gear 300 are both meshed with the two half-shaft gears 200 at the same time.

[0045] Based on the above, the working principle of the differential assembly provided in this embodiment is as follows:

[0046] A half shaft is respectively inserted into the two assembly holes 102 of the differential case 100, and the two half shafts are respectively fixedly connected to the two half shaft gears 200. The torque is transmitted to the first planetary gear and the second planetary gear 300 through the differential case 100, and then transmitted to the half shaft gear 200 through the first planetary gear and the second planetary gear 300. The half shaft gear 200 drives the half shaft connected thereto to rotate, and the half shaft outputs the torque to the wheel assembly. When there is a speed difference, the differential assembly can make adaptive adjustments according to the running state of the wheel to prevent the wheel from slipping. Since the surface where the side gear 200 abuts against the differential case 100, i.e., the second limiting surface 210, is set as a plane, compared with the design of the step surface of the side gear 200 in the prior art, there is no need to open a notch on the second limiting surface 210 to form a step structure, and thus there is no avoidance space formed by the step surface, and the thickness of the part of the shaft section of the side gear 200 will not be reduced due to the avoidance space. The thickness of the side gear 200 is relatively large in the axial direction, wherein the thickness of the side gear 200 can be understood as the radial dimension of the side gear 200. Since the side gear 200 does not have a notch structure, the side gear 200 is not prone to stress concentration, cracking or breaking at the connection, the entire side gear 200 has high strength, is not prone to bending deformation during service, and has high operational reliability of the differential assembly.

[0047] The following embodiments illustrate the details of the differential assembly provided by the present application by way of examples.

[0048] Please combine Figure 1-Figure 4 In this embodiment, optionally, the differential assembly includes a differential case 100, two half-shaft gears 200, two first planetary gears (not shown), two second planetary gears 300, a first planetary shaft 400, two second planetary shafts 500, a tooth 600, two first gear washers 700, four second gear washers 800, a connecting sleeve 900, a first fastener 001 and two second fasteners 002.

[0049] The toothed gear 600 can be connected to the differential case 100 by bolts, and the toothed gear 600 is used to mesh with the input gear shaft to input torque. Both side gears 200 are rotatably mounted in the differential case 100, and the two first planetary gears are coaxially arranged and connected to the differential case 100 through the first planetary shaft 400. The two second planetary gears 300 are coaxially arranged and connected to the differential case 100 through two second planetary shafts 500 respectively. The first planetary shaft 400 and the two second planetary shafts 500 are arranged vertically. The first planetary gear and the second planetary gear 300 are located between the two side gears 200 and mesh with the two side gears 200 at the same time. The first planetary shaft 400 passes through the connecting sleeve 900 and is fixedly connected by the first fastener 001. The two ends of the connecting sleeve 900 are respectively sleeved on the outside of the two second planetary shafts 500, and the first planetary shaft 400 passes through the connecting sleeve 900, and the position of the passing is located between the two second planetary shafts 500. Each second planetary shaft 500 is fixedly connected to the connecting sleeve 900 through a second fastener 002. The two first gear washers 700 are respectively matched with the two side shaft gears 200, and each first gear washer 700 is clamped between the corresponding side shaft gear 200 and the differential case 100, which can reduce the wear of the side shaft gear 200 on the differential case 100. The four second gear washers 800 are respectively matched with the two first planetary gears and the two second planetary gears 300, and there is a second gear washer 800 between each first planetary gear and the differential case 100, and there is a second gear washer 800 between each second planetary gear 300 and the differential case 100.

[0050] It should be understood that the structures of the first planetary gear and the second planetary gear 300 may be arranged to be the same.

[0051] Please combine Figure 2 Optionally, the differential housing 100 has a mounting cavity 101 and two assembly holes 102 connected to the mounting cavity 101. The two assembly holes 102 are coaxial and located on both sides of the mounting cavity 101. Each assembly hole 102 is a circular hole. The two assembly holes 102 are respectively used to penetrate the corresponding half-axles, that is, each assembly hole 102 is used to penetrate a half-axle, and the half-axle and the assembly hole 102 are clearance fit. At the same time, the mounting cavity 101 has two first limiting surfaces 110 in the axial direction of the assembly hole 102. Each first limiting surface 110 can be set as a circular ring plane. The two first limiting surfaces 110 correspond to the two assembly holes 102 respectively, that is, each first limiting surface 110 is set around an assembly hole 102.

[0052] Furthermore, an anti-rotation groove 104 is provided on each first limiting surface 110, and the anti-rotation groove 104 can be engaged with the first gear gasket 700 to limit the first gear gasket 700 from rotating relative to the differential case 100, thereby reducing the wear on the differential case 100. For example, the anti-rotation groove 104 includes a main groove body and a clamping groove body connected to the side of the main groove body, and the clamping groove body can be a semicircular groove structure, and the number of the clamping groove bodies is not limited to one. When the number of the clamping groove bodies is multiple, the multiple clamping groove bodies are arranged at intervals around the main groove body.

[0053] Furthermore, four fixing holes 103 are provided on the differential housing 100, two fixing holes 103 form a group, the axes of the two fixing holes 103 in the same group coincide, and the axes of the two groups of fixing holes 103 are perpendicular. The first planetary shaft 400 is simultaneously inserted into the two fixing holes 103 in the same group, and the two second planetary shafts 500 are respectively inserted into the two fixing holes 103 in the other group.

[0054] In addition, bosses 120 are respectively provided on two outer sides of the differential housing 100 in the axial extension direction of the assembly hole 102 , and a bearing is installed on each boss 120 .

[0055] In this embodiment, optionally, each side gear 200 includes a tooth surface and a second limiting surface 210 opposite to the tooth surface, and the second limiting surface 210 is set as a plane, for example, the second limiting surface 210 is a circular ring plane. The two side gears 200 are installed in the installation cavity 101, and the second limiting surfaces 210 of the two side gears 200 are located on the outside. The two first limiting surfaces 110 are respectively matched with the two second limiting surfaces 210, and a first gear gasket 700 is sandwiched between the corresponding first limiting surfaces 110 and the second limiting surfaces 210.

[0056] Please combine Figure 3 Optionally, the side gear 200 includes an integrated umbrella-shaped portion 220 and an equal-diameter portion 230, the tooth surface is located on the end surface of the umbrella-shaped portion 220 away from the equal-diameter portion 230, and the outer diameter of the equal-diameter portion 230 is equal everywhere in the axial direction of the equal-diameter portion 230; the second limiting surface 210 is provided at one end of the equal-diameter portion 230 away from the umbrella-shaped portion 220. The cross section of the equal-diameter portion 230 may be a toroidal surface.

[0057] Please combine Figure 4 Optionally, the first gear washer 700 includes a main body ring 710 and a clamping protrusion 720 connected to each other, and the clamping protrusion 720 is convexly arranged on the circumference of the main body ring 710. During assembly, the main body ring 710 is clamped to the main slot body, and the clamping protrusion 720 is clamped to the clamping slot body. The first gear washer 700 is firmly matched with the differential case 100, and the anti-rotation effect is good.

[0058] It should be understood that the first gear washer 700 can be provided as an integral structure.

[0059] In addition, a groove for positioning the second gear washer 800 may be provided in the differential housing 100 to prevent the second gear washer 800 from rotating relative to the differential housing 100 .

[0060] In this embodiment, optionally, two centrally symmetrical positioning grooves 410 are provided at the middle position of the first planetary shaft 400, and a first hole is provided at the middle position of the first planetary shaft 400, the first hole is perpendicular to the axis of the first planetary shaft 400 and is located between the two positioning grooves 410. A second hole is provided on the second planetary shaft 500, the second hole is located on the outer peripheral surface of the second planetary shaft 500 and is perpendicular to the axis of the second planetary shaft 500.

[0061] In other embodiments, the two positioning grooves 410 may be connected to form an annular groove in the middle of the first planet shaft 400 .

[0062] In this embodiment, optionally, the connecting sleeve 900 is provided with a third hole, a fourth hole and two fifth holes, the axis of the connecting sleeve 900, the axis of the third hole and the axis of the fourth hole are perpendicular to each other, the axis of the third hole intersects with the axis of the fourth hole. The axes of the two fifth holes are parallel to the fourth hole, and the third hole and the fourth hole are located between the two fifth holes.

[0063] During assembly, the first planetary shaft 400 is inserted into the third hole, and the first fastener 001 is inserted into the first hole and the fourth hole at the same time. The two second planetary shafts 500 are plugged into the two ends of the connecting sleeve 900, and the end of each second planetary shaft 500 is plugged into the corresponding positioning groove 410 of the first planetary shaft 400 to improve the firmness of the combination. The second hole on each second planetary shaft 500 is connected to the corresponding fifth hole on the connecting sleeve 900, and the second fastener 002 is simultaneously inserted into the connected second hole and the fifth hole. It should be understood that the first fastener 001 and the second fastener 002 can both be set as elastic pins.

[0064] The differential assembly provided in this embodiment designs the shaft of the half-shaft gear 200 to be an equal-diameter structure. The half-shaft gear 200 has high structural strength and is not easily damaged during service. It is safe and reliable to use, and the operation of the differential assembly is stable and reliable.

[0065] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A differential assembly, characterized in that: include: A differential case (100), two side shaft gears (200), two first planetary gears, two second planetary gears (300), a first planetary shaft (400) and two second planetary shafts (500), wherein the differential case (100) has a mounting cavity (101) and two assembly holes (102) communicating with the mounting cavity (101), wherein the two assembly holes (102) are respectively used to penetrate corresponding side shafts, and the mounting cavity (101) has two first limiting surfaces (110) in the axial direction of the assembly holes (102); each of the side shaft gears (200) comprises a tooth surface and a second limiting surface (210) opposite to the tooth surface, wherein the second limiting surface (210) is set as a plane; the two side shaft gears (200) are both mounted in the mounting cavity (101), and the two first limiting surfaces (110) are respectively in contact with the two second limiting surfaces (210); The first planetary shaft (400) and the two second planetary shafts (500) are both mounted on the differential case (100); the two second planetary shafts (500) are both connected to the first planetary shaft (400) and are arranged crosswise; the two first planetary gears are both mounted on the first planetary shaft (400); the two second planetary gears (300) are respectively mounted on the two second planetary shafts (500); the first planetary gear and the second planetary gear (300) are both meshed with the two half-shaft gears (200) at the same time.

2. The differential assembly according to claim 1, characterized in that: The half-axle gear (200) comprises an integrated umbrella-shaped portion (220) and an equal-diameter portion (230); the tooth surface is located on the end surface of the umbrella-shaped portion (220) away from the equal-diameter portion (230); the outer diameter of the equal-diameter portion (230) is equal at all locations in the axial direction of the equal-diameter portion (230); and the second limiting surface (210) is provided at one end of the equal-diameter portion (230) away from the umbrella-shaped portion (220).

3. The differential assembly according to claim 1, characterized in that: The differential assembly further comprises a first gear washer (700), the first gear washer (700) being clamped between the first limiting surface (110) and the second limiting surface (210), and the first gear washer (700) being provided with a first through hole for the half shaft to pass through.

4. The differential assembly according to claim 3, characterized in that: An anti-rotation groove (104) is provided on the first limiting surface (110), the first gear gasket (700) is snap-fitted into the anti-rotation groove (104), and the first gear gasket (700) and the anti-rotation groove (104) are relatively fixed in the circumferential direction of the first through hole.

5. The differential assembly according to claim 4, characterized in that: The anti-rotation groove (104) includes a main groove body and a snap-in groove body connected to the side of the main groove body; the first gear gasket (700) includes a connected main ring (710) and a snap-in protrusion (720), and the snap-in protrusion (720) is protruding on the circumferential surface of the main ring (710); the main ring (710) is snap-in to the main groove body, and the snap-in protrusion (720) is snap-in to the snap-in groove body.

6. The differential assembly according to claim 1, characterized in that: The differential assembly also includes a connecting sleeve (900), and the first planetary shaft (400) passes through the connecting sleeve (900); the two second planetary shafts (500) are respectively plugged into two ends of the connecting sleeve (900), and the first planetary shaft (400) is located between the two second planetary shafts (500).

7. The differential assembly according to claim 6, characterized in that: The connecting sleeve (900) is provided with a first fastener (001) and two second fasteners (002); the first fastener (001) passes through the first planetary shaft (400), and the two second fasteners (002) respectively pass through the two second planetary shafts (500).

8. The differential assembly according to claim 6, characterized in that: The outer peripheral surface of the first planetary shaft (400) is provided with two positioning grooves (410) arranged opposite to each other, the two second planetary shafts (500) are respectively inserted into the two positioning grooves (410), and the ends of the second planetary shafts (500) are in contact with the bottom walls of the corresponding positioning grooves (410).

9. The differential assembly according to claim 1, characterized in that: The differential assembly also includes a second gear washer (800) for passing through the first planetary shaft (400) or the second planetary shaft (500), and the second gear washer (800) is arranged between the first planetary gear and the differential housing (100) or between the second planetary gear (300) and the differential housing (100).

10. The differential assembly according to claim 1, characterized in that: The differential assembly further comprises a toothed wheel (600), wherein the toothed wheel (600) is connected to the differential housing (100), and the toothed wheel (600) is used for meshing with an input gear shaft.

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