Piston hydraulic type locking structure and differential mechanism

Abstract

The invention provides a piston hydraulic type locking structure and a differential mechanism, the piston hydraulic type locking structure comprises a half axle gear, a first shell and a half axle main body, the half axle main body is sleeved with the half axle gear, the half axle gear is sleeved with the first shell, and a piston cavity used for containing a piston body is formed in the joint of the half axle gear and the first shell; the first shell is provided with a first oil duct communicated with the piston cavity, the half axle gear is provided with a second oil duct communicated with the piston cavity, and the first oil duct and the second oil duct are arranged on the two back-to-back faces of the piston body respectively. According to the piston hydraulic type locking structure, the piston body in the piston cavity can be driven by hydraulic oil to change the position, the time consumed in the positioning process can be shortened, then the precise control capacity of a vehicle under the off-road working condition is improved, and the vehicle escaping capacity is improved; the piston hydraulic type locking structure is high in locking efficiency, accurate in locking, simple in overall structure, easy to machine and assemble and low in production cost.

Description

Technical Field

[0001] The present application relates to the technical field of differentials, and in particular to a piston hydraulic locking structure and a differential. Background Art

[0002] The differential is a mechanism that enables the left and right wheels or the front and rear wheels to rotate at different speeds. It is mainly composed of left and right half-axle gears, planetary gears, differential housing, etc. Its function is to enable the left and right wheels to roll at different speeds when the car is turning or driving on uneven roads. When driving in a straight line, the differential does not work; in four-wheel drive, all wheels must be mechanically connected together. When the car is driving in a curve, the speed of each wheel is different. At this time, a central differential is also required to adjust the speed difference between the front and rear wheels. The differential solves the requirement of different speeds of the left and right drive wheels when the car is on uneven roads and turning. However, the existence of the differential also means that power cannot be effectively transmitted when one side of the car's drive wheel slips. That is, the power will be consumed by the slipping wheel, while the non-slipping wheel will not get enough power to get out of trouble. For example, when the car is in off-road conditions, it is easy for a single wheel to become suspended in the air or sink into the sand and lose friction with the ground. At this time, the differential will cause the slipping wheel to rotate faster, causing the wheel on the other side in contact with the ground to lose power. In order to solve this problem, a differential lock is needed to lock the two rear wheels to eliminate the speed difference.

[0003] However, due to structural reasons, the existing differential locks have inaccurate locking positions and require a long positioning time. When locking, the splines at the connection are also worn, reducing the service life and reliability.

[0004] Therefore, it is necessary to design a piston hydraulic locking structure to solve the above problems. Summary of the invention

[0005] In view of this, in order to overcome the defects of the prior art, the present invention provides a piston hydraulic locking structure and a differential, which effectively solves the problem that the existing differential lock, due to structural reasons, leads to inaccurate locking position, requires a long positioning time, and also causes wear to the splines at the connection when locking, thereby reducing the service life and reliability.

[0006] According to a first aspect of the present invention, a piston hydraulic locking structure is provided, wherein the piston hydraulic locking structure includes a half-shaft gear, a first housing and a half-shaft body, the half-shaft gear is sleeved on the half-shaft body, the first housing is sleeved on the half-shaft gear, a piston cavity for accommodating the piston body is provided at the connection between the half-shaft gear and the first housing, the first housing is provided with a first oil passage connected to the piston cavity, the half-shaft gear is provided with a second oil passage connected to the piston cavity, and the first oil passage and the second oil passage are respectively provided on two back-to-back surfaces of the piston body.

[0007] Preferably, a third oil passage connected to the second oil passage is opened in the middle of the half-shaft body; the piston hydraulic locking structure can switch between a locked state and an unlocked state. When the piston hydraulic locking structure is in the locked state, the hydraulic oil flows from the first oil passage to the piston chamber to push the piston body so that the piston body abuts the half-shaft gear. When the piston hydraulic locking structure is in the unlocked state, the hydraulic oil flows from the third oil passage and the second oil passage to the piston chamber in sequence to push the piston body so that the piston body is separated from the half-shaft gear.

[0008] Preferably, when the half-shaft body passes through the half-shaft gear, a lubrication gap is formed between the end of the half-shaft body located inside the half-shaft gear and the inner side wall of the half-shaft gear.

[0009] Preferably, a plurality of oil supply holes are provided at the end of the half-shaft body located inside the half-shaft gear, the plurality of oil supply holes are connected to the third oil passage, and the axes of the plurality of oil supply holes are flush with the axis of the second oil passage in the horizontal direction.

[0010] Preferably, the first end of the half-shaft gear extends radially outward to form a locking position, the locking position faces the piston body, the locking position is provided with a plurality of first meshing teeth, and a side of the piston body facing the locking position is provided with a plurality of second meshing teeth, and the plurality of second meshing teeth are arranged corresponding to the plurality of first meshing teeth.

[0011] Preferably, a first seal and a second seal are respectively provided at both ends of the first shell, the first seal seals the first end of the first shell, the second seal is provided inside the second end of the first shell, and the half-shaft body passes through the second seal.

[0012] According to a second aspect of the present invention, a differential is provided, wherein the differential comprises the piston hydraulic locking structure as described above.

[0013] Preferably, the differential further includes a second housing and a planetary gear set, wherein the planetary gear set is disposed inside the second housing and meshes with the half-shaft gears; the second housing is connected to the first housing via a connecting member.

[0014] Preferably, the side gear includes a first gear body and a second gear body arranged facing each other, the first gear body is arranged inside the first housing, and the second gear body is arranged inside the second housing through a gasket.

[0015] Preferably, the planetary gear set includes a first planetary gear, a first straight-axis, a second planetary gear and a second straight-axis, the first straight-axis passes through the first planetary gear, the second straight-axis passes through the second planetary gear, the first planetary gear and the second planetary gear are arranged facing each other; the first gear body, the first planetary gear, the second gear body and the second planetary gear are meshed in sequence.

[0016] According to the piston hydraulic locking structure of the present invention, through the cooperation of the half-shaft gear, the first housing and the half-shaft body, and the first oil channel and the second oil channel are respectively arranged on the first housing and the half-shaft gear, the piston body in the piston cavity can be driven by the hydraulic oil to change the position, thereby making the piston hydraulic locking structure in a locked state or an unlocked state. Since the entire action is driven by the hydraulic oil, the locking efficiency is high and the locking is accurate, and the time consumed in the positioning process can also be reduced, thereby improving the vehicle's ability to accurately control in off-road conditions and improving the vehicle's ability to escape from difficulties; in addition, the piston hydraulic locking structure has a simple overall structure, is easy to process and assemble, and has a low production cost.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a piston hydraulic locking structure according to an embodiment of the present invention is shown;

[0020] Figure 2 The embodiment according to the present invention is shown Figure 1 An enlarged schematic diagram of the structure at A;

[0021] Figure 3 A schematic diagram showing a structure of a piston hydraulic locking structure in an unlocked state according to an embodiment of the present invention;

[0022] Figure 4 A schematic diagram showing a structure of a piston hydraulic locking structure in a locked state according to an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a first gear body according to an embodiment of the present invention is shown;

[0024] Figure 6 A schematic structural diagram of a half-shaft body according to an embodiment of the present invention is shown;

[0025] Figure 7 A schematic structural diagram of a differential according to an embodiment of the present invention is shown.

[0026] Figure markings: 1-first gear body; 101-second oil channel; 102-first meshing tooth; 103-locking position; 2-first housing; 201-first oil channel; 3-semi-axle body; 301-third oil channel; 302-oil supply hole; 4-piston body; 401-second meshing tooth; 5-piston chamber; 601-first seal; 602-second seal; 7-lubrication gap; 8-second housing; 9-second gear body; 10-first planetary gear; 11-first straight shaft; 12-second planetary gear; 13-second straight shaft; 14-connecting piece; 15-gasket. DETAILED DESCRIPTION

[0027] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present 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 the present application. 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.

[0029] 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.

[0030] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" 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 connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] According to a first aspect of the present invention, a piston hydraulic locking structure is provided, such as Figures 1 to 6 As shown, the piston hydraulic locking structure is used for a differential, and the piston hydraulic locking structure includes a half-shaft gear, a first housing 2 and a half-shaft body 3.

[0032] In the following description, reference will be made to Figures 1 to 6 The detailed structures of the half-axle gear, the first housing 2 and the half-axle body 3 of the piston hydraulic locking structure are described in detail. Figure 7 The differential shown in the figure may include two side gears opposite to each other, which may be the first gear body 1 and the second gear body 9 respectively. The side gears included in the piston hydraulic locking structure may be understood as the first gear body 1 in the differential. The piston hydraulic locking structure realizes the hydraulic locking of the differential by improving the structure of the first gear body 1.

[0033] like Figures 1 to 6As shown, in the embodiment, the side gear is sleeved on the side shaft body 3, and the first housing 2 sleeves the side gear. A piston cavity 5 for accommodating the piston body 4 is provided at the connection between the side gear and the first housing 2. The first housing 2 is provided with a first oil passage 201 communicating with the piston cavity 5, and the side gear is provided with a second oil passage 101 communicating with the piston cavity 5. The first oil passage 201 and the second oil passage 101 are respectively provided on two opposite faces of the piston body 4. In this way, according to the locking requirements, the hydraulic oil can enter the interior of the piston cavity 5 from two directions and push the piston body 4 so that the piston body 4 changes its position. When the hydraulic oil enters the piston cavity 5 from the first oil passage 201, the piston body 4 can be pushed until it abuts against the side gear. At this time, the side gear is locked, and then the first gear body 1 and the second gear body 9 in the differential have the same rotation speed, eliminating the speed difference, so that the two wheels of the vehicle have the same rotation speed, and can travel in off-road conditions. When the hydraulic oil enters the piston chamber 5 from the second oil passage 101 , the piston body 4 can be pushed, so that the piston body 4 is separated from the side gear, unlocking the side gear, so that the differential works normally.

[0034] The piston hydraulic locking structure cooperates with the half-shaft gear, the first housing 2 and the half-shaft body 3, and the first oil channel 201 and the second oil channel 101 are respectively arranged on the first housing 2 and the half-shaft gear, so that the piston body 4 in the piston chamber 5 can be driven by the hydraulic oil to change the position, thereby locking or unlocking the piston hydraulic locking structure. Since the entire action is driven by the hydraulic oil, the locking efficiency is high and the locking is accurate, and the time consumed in the positioning process can also be reduced, thereby improving the vehicle's ability to accurately control in off-road conditions and improving the vehicle's ability to escape from difficulties. In addition, the overall structure of the piston hydraulic locking structure is simple, easy to process and assemble, and has a low production cost.

[0035] It should also be noted that the first oil passage 201 and the second oil passage 101 can be connected to the existing oil and pressure system of the vehicle, and the pressure of the hydraulic oil can be controlled by the oil and pressure system, thereby controlling the displacement speed and locking time of the piston body 4. Since controlling the pressure of the hydraulic oil is known to those skilled in the art and is irrelevant to the design of this application, it will not be described in detail here.

[0036] Preferably, if Figure 1 , Figure 2 and Figure 6 As shown, in the embodiment, a third oil passage 301 communicating with the second oil passage 101 is opened in the middle of the half-shaft body 3 , and the hydraulic oil can enter the second oil passage 101 through the third oil passage 301 and then flow into the piston chamber 5 .

[0037] Preferably, if Figure 3 and Figure 4As shown, in an embodiment, the piston hydraulic locking structure can be switched between a locked state and an unlocked state. Figure 4 As shown, when the piston hydraulic locking structure is in a locked state, the hydraulic oil flows from the first oil passage 201 to the piston chamber 5 to push the piston body 4 so that the piston body 4 abuts against the half-shaft gear. Figure 3 As shown, when the piston hydraulic locking structure is in the unlocked state, the hydraulic oil flows from the third oil passage 301 and the second oil passage 101 to the piston chamber 5 in sequence to push the piston body 4 so that the piston body 4 is separated from the side shaft gear. The side shaft gear here can be, for example, Figure 7 The first gear body 1 in the vehicle. The locked state and the unlocked state can correspond to different working conditions. For example, when the vehicle turns, the piston hydraulic locking structure is in the unlocked state, so that the two wheels of the vehicle (for example, the two wheels at the rear end of the vehicle) rotate at different speeds, making the vehicle turn more convenient. When the vehicle is off-road, the piston hydraulic locking structure is in the locked state, so that the two wheels of the vehicle rotate at the same speed, so that the vehicle can get out of the sand or drive better.

[0038] Preferably, if Figure 1 and Figure 2 As shown, in the embodiment, when the half-shaft body 3 is penetrated by the half-shaft gear, a lubrication gap 7 is formed between the end of the half-shaft body 3 located inside the half-shaft gear (the half-shaft body 3 may include two ends, and the two ends are respectively connected to the wheel and the half-shaft gear), the end connected to the half-shaft gear and the inner side wall of the half-shaft gear. In this way, when the hydraulic oil penetrates from the inside of the half-shaft body 3 and flows to the half-shaft gear, part of the hydraulic oil can flow into the lubrication gap 7, thereby achieving lubrication at this location, and then the gasket 15 in the original structure can be eliminated at this location (the gasket 15 can be, for example, Figure 7 Such a design can reduce the weight of the overall structure, increase the reliability during use, and reduce the possibility of damage to the axle gear due to wear of the gasket 15.

[0039] Preferably, if Figure 1 , Figure 2 and Figure 6 As shown, in the embodiment, the end of the half-shaft body 3 located inside the half-shaft gear is provided with a plurality of oil supply holes 302, and the plurality of oil supply holes 302 are connected to the third oil passage 301, and the axes of the plurality of oil supply holes 302 are aligned with the axis of the second oil passage 101 in the horizontal direction. The alignment of the axes of the oil supply holes 302 and the second oil passage 101 facilitates the passage of hydraulic oil, improves locking efficiency, and reduces reaction time. In addition, the axis here is from Figure 1 , Figure 2 and Figure 6 From a cross-sectional perspective.

[0040] Preferably, if Figure 2 and Figure 5 As shown, in the embodiment, the first end of the side gear extends radially outward to form a locking position 103, the locking position 103 faces the piston body 4, the locking position 103 is provided with a plurality of first meshing teeth 102, and the side of the piston body 4 facing the locking position 103 is provided with a plurality of second meshing teeth 401, and the plurality of second meshing teeth 401 are arranged correspondingly to the plurality of first meshing teeth 102. The corresponding arrangement here means that the number and size of the first meshing teeth 102 and the second meshing teeth 401 correspond to each other. For example, in the embodiment, the number of the first meshing teeth 102 is two, the number of the second meshing teeth 401 is three, and the three second meshing teeth 401 are butted with the two first meshing teeth 102. The first meshing teeth 102 and the second meshing teeth 401 can both be formed as cylindrical structures for easy butt connection. The plurality of second meshing teeth 401 and the plurality of first meshing teeth 102 can increase the precision of the abutment when the piston body 4 abuts against the half-shaft gear, thereby achieving rapid and precise locking of the piston hydraulic locking structure.

[0041] Preferably, if Figure 1 As shown, in the embodiment, the first seal 601 and the second seal 602 are respectively provided at both ends of the first housing 2, the first seal 601 seals the first end of the first housing 2, the second seal 602 is provided inside the second end of the first housing 2, and the second seal 602 is passed through the half-shaft body 3. The first seal 601 can be, for example, a sealing end cover, and the second seal 602 can be, for example, an O-ring. Both the first seal 601 and the second seal 602 can play a sealing role to prevent leakage of hydraulic oil, and can also ensure pressure and sufficient lubrication.

[0042] The assembly and use process of the piston hydraulic locking structure is as follows: the piston body 4 is installed inside the first housing 2, the side gear is installed inside the first housing 2, and finally the side gear body 3 is assembled with the side gear. When in use, in the locked state, the hydraulic oil flows from the first oil passage 201 into the piston cavity 5 and pushes the piston body 4, so that the piston body 4 abuts against the side gear, eliminating the speed difference between the two wheels of the vehicle. When switching from the locked state to the unlocked state, the hydraulic oil flows from the third oil passage 301, the oil supply hole 302 and the second oil passage 101 of the side gear body 3 in sequence, and finally flows into the piston cavity 5, pushing the piston body 4, so that the piston body 4 is separated from the side gear, so that the differential works. When the oil flows, part of the oil can flow to the lubrication gap 7 to achieve lubrication of the side gear body 3 and the side gear.

[0043] The piston hydraulic locking structure is able to change the position of the piston body in the piston cavity through the cooperation of the half-shaft gear, the first housing and the half-shaft body, and the first oil channel and the second oil channel are respectively arranged on the first housing and the half-shaft gear, so that the piston body in the piston cavity can be driven by the hydraulic oil to change the position, thereby making the piston hydraulic locking structure in a locked state or an unlocked state. Since the entire action is driven by the hydraulic oil, the locking efficiency is high and the locking is accurate, and the time consumed in the positioning process can also be reduced, thereby improving the vehicle's ability to accurately control in off-road conditions and improving the vehicle's ability to escape from difficulties; in addition, the piston hydraulic locking structure has a simple overall structure, is easy to process and assemble, and has a low production cost.

[0044] In addition, if Figure 7 As shown, according to a second aspect of the present invention, a differential is provided, the differential comprising the piston hydraulic locking structure as described above. During use, the differential can achieve the function of eliminating the wheel speed difference by providing the piston hydraulic locking structure.

[0045] Preferably, if Figure 7 As shown, in the embodiment, the differential may further include a second housing 8 and a planetary gear set, the planetary gear set is arranged inside the second housing 8, and the planetary gear set is meshed with the side gears; the second housing 8 is connected to the first housing 2 through a connecting member 14. The connecting member 14 may be, for example, a connecting bolt.

[0046] Preferably, if Figure 7 As shown, in the embodiment, the side gear may include a first gear body 1 and a second gear body 9 facing each other, the first gear body 1 is arranged inside the first housing 2, and the second gear body 9 is arranged inside the second housing 8 through a gasket 15. Since the above-mentioned piston hydraulic locking structure includes the first gear body 1, the first gear body 1 does not need to be installed with a gasket 15 when it is installed. In this way, during the overall assembly, the installation of a set of gaskets 15 can be reduced, making the overall weight lighter, reducing the number of parts, and improving the reliability of the structure, and also reducing the possibility of damage to the side gear due to wear of the gasket 15.

[0047] Preferably, if Figure 7 As shown, in the embodiment, the planetary gear set may include a first planetary gear 10, a first straight shaft 11, a second planetary gear 12 and a second straight shaft 13, the first straight shaft 11 passes through the first planetary gear 10, the second straight shaft 13 passes through the second planetary gear 12, and the first planetary gear 10 and the second planetary gear 12 are arranged facing each other. The first gear body 1, the first planetary gear 10, the second gear body 9 and the second planetary gear 12 are meshed in sequence to realize the function of a differential.

[0048] Since the differential uses the above piston hydraulic locking structure, it can realize the locking function and can realize accurate control of the position of the piston body 4, thereby achieving fast and accurate locking or disconnection. At the same time, the overall structure is simple, zero reduction, easy to assemble and low cost, and can be applied to different models.

[0049] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A piston hydraulic locking structure, characterized in that: The piston hydraulic locking structure includes a half-shaft gear, a first housing and a half-shaft body, the half-shaft gear is sleeved on the half-shaft body, the first housing is sleeved on the half-shaft gear, a piston cavity for accommodating the piston body is provided at the connection between the half-shaft gear and the first housing, the first housing is provided with a first oil passage connected to the piston cavity, the half-shaft gear is provided with a second oil passage connected to the piston cavity, and the first oil passage and the second oil passage are respectively provided on two back-to-back surfaces of the piston body.

2. The piston hydraulic locking structure according to claim 1, characterized in that: A third oil passage communicating with the second oil passage is provided in the middle of the half shaft body; The piston hydraulic locking structure can switch between a locked state and an unlocked state. When the piston hydraulic locking structure is in the locked state, the hydraulic oil flows from the first oil passage to the piston chamber to push the piston body so that the piston body abuts against the half-shaft gear. When the piston hydraulic locking structure is in the unlocked state, the hydraulic oil flows from the third oil passage and the second oil passage to the piston chamber in sequence to push the piston body so that the piston body is separated from the half-shaft gear.

3. The piston hydraulic locking structure according to claim 2, characterized in that: In the case where the half-shaft body passes through the half-shaft gear, a lubrication gap is formed between the end of the half-shaft body located inside the half-shaft gear and the inner side wall of the half-shaft gear.

4. The piston hydraulic locking structure according to claim 2, characterized in that: A plurality of oil supply holes are formed at the end of the half-shaft body located inside the half-shaft gear. The plurality of oil supply holes are connected to the third oil passage. The axes of the plurality of oil supply holes are flush with the axis of the second oil passage in the horizontal direction.

5. The piston hydraulic locking structure according to claim 1, characterized in that: The first end of the half-shaft gear extends radially outward to form a locking position, which faces the piston body. The locking position is provided with a plurality of first meshing teeth, and a side of the piston body facing the locking position is provided with a plurality of second meshing teeth, and the plurality of second meshing teeth are arranged corresponding to the plurality of first meshing teeth.

6. The piston hydraulic locking structure according to claim 1, characterized in that: A first seal and a second seal are respectively disposed at both ends of the first housing, the first seal seals the first end of the first housing, the second seal is disposed inside the second end of the first housing, and the half-shaft body passes through the second seal.

7. A differential, characterized in that: The differential comprises the piston hydraulic locking structure according to any one of claims 1 to 6.

8. The differential according to claim 7, characterized in that: The differential also includes a second housing and a planetary gear set, wherein the planetary gear set is disposed inside the second housing and meshes with the side gears; The second shell is connected to the first shell through a connecting piece.

9. The differential according to claim 8, characterized in that: The side gear includes a first gear body and a second gear body disposed facing each other, the first gear body is disposed inside the first housing, and the second gear body is disposed inside the second housing via a gasket.

10. The differential according to claim 9, characterized in that: The planetary gear set comprises a first planetary gear, a first straight shaft, a second planetary gear and a second straight shaft, the first straight shaft passes through the first planetary gear, the second straight shaft passes through the second planetary gear, and the first planetary gear and the second planetary gear are arranged to face each other; The first gear body, the first planetary gear, the second gear body and the second planetary gear are meshed in sequence.

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