Differential device and vehicle suitable for multiple working conditions

Abstract

The present invention discloses a differential device and a vehicle suitable for multiple working conditions, comprising a differential housing, an output half-shaft, a transmission half-shaft, a connecting sleeve and an actuator, wherein a group of output half-shafts are respectively arranged on both sides of the differential housing, the transmission half-shafts are coaxially arranged on the side of the end of a group of output half-shafts, the two ends of the connecting sleeve are respectively sleeved on the end of the transmission half-shaft and the end of the output half-shaft, the outer side of the connecting sleeve is connected with the actuator, and the connecting sleeve is driven by the actuator to move axially to drive the differential device to switch between a disconnected state, a locked state and a normal operating state. The differential device solves the problem that the differential device in the existing time-sharing four-wheel drive vehicle cannot be completely disconnected, improves the power transmission efficiency when the vehicle four-wheel drive is switched to two-wheel drive, and has high versatility; at the same time, a locking state is added to solve the problems of high and low assist and wheel slippage on turning roads, and improves the power, stability, maneuverability, etc. of the whole vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle transmission devices, and in particular to a differential device and a vehicle suitable for multiple working conditions. Background Art

[0002] Automobile driving modes can generally be divided into two-wheel drive and four-wheel drive. Two-wheel drive means that only two wheels of the vehicle are driving wheels during the entire driving process, while four-wheel drive means that the vehicle always maintains four-wheel drive during the entire driving process; among them, the two-wheel drive mode has a higher power transmission efficiency, but the traffic capacity and control ability are weaker, while the four-wheel drive mode has a lower power transmission efficiency, but the control and traffic capacity are greatly improved. In order to take into account the advantages of two-wheel drive and four-wheel drive, the existing four-wheel drive vehicles mostly adopt the method of replacing four-wheel drive with two-wheel drive, that is, part-time four-wheel drive. Part-time four-wheel drive refers to the driving mode in which the driver changes the two-wheel drive or four-wheel drive mode by connecting or disconnecting the transfer case according to the road conditions, thereby realizing the free conversion of two-wheel drive and four-wheel drive. Part-time four-wheel drive usually only uses the two-wheel drive of the front or rear wheels to drive, so as to improve the power transmission efficiency and reduce energy consumption; while on rugged roads such as snow and gravel, it switches to four-wheel drive to drive to improve traffic capacity.

[0003] At present, most vehicles with part-time four-wheel drive have a set of differentials at the front and rear axles, and a transfer case in the middle of the vehicle. The engine power is transmitted to the transfer case, and then transmitted to the differentials at the front and rear axles respectively by the transfer case, so as to achieve four-wheel drive. When switching to two-wheel drive, the output shaft of the transfer case and the corresponding differential is connected or disconnected according to the position of the drive wheel. However, in the two-wheel drive state, the differential without the transfer case will still be subjected to the reverse rotational force transmitted by the wheel when running, and then drive the corresponding differential and output shaft to rotate. In this process, the differential and output shaft will waste part of the motion thrust of the drive wheel, causing energy loss. For this reason, it is necessary to design a differential device that not only meets the traditional functions of the differential, but also can completely disconnect the differential from the wheel power connection.

[0004] It can be seen that the above-mentioned existing differential still has certain defects in power transmission efficiency and needs to be further improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a differential device and a vehicle suitable for multiple working conditions, which solves the problem that the differential device in the existing part-time four-wheel drive vehicle cannot be completely disconnected. The differential device improves the power transmission efficiency when the vehicle four-wheel drive is switched to two-wheel drive, thereby overcoming the shortcomings of the prior art.

[0006] In order to solve the above technical problems, the present invention provides a differential device suitable for multiple working conditions, which includes a differential housing, an output half shaft, a transmission half shaft, a connecting sleeve and an actuator.

[0007] A differential gear set is arranged inside the differential housing, and shaft sleeves are respectively arranged on both sides of the differential housing, and a group of output half shafts are movably connected in the shaft sleeves, and one end of the output half shaft is connected to the differential gear set, and the output half shaft is driven to rotate through the differential gear set;

[0008] The transmission half-shaft is coaxially arranged on the side of the end of a group of output half-shafts, the two ends of the connecting sleeve are respectively sleeved on the transmission half-shaft end and the output half-shaft end, and the sleeved position of the transmission half-shaft is provided with a first external connection part, and the sleeved position of the output half-shaft is provided with a second external connection part; the inner walls at both ends of the connecting sleeve are respectively provided with a first internal connection part and a second internal connection part, and the outer surface of at least one end of the connecting sleeve is provided with a third external connection part; the inner surface of the sleeve on the side of the transmission half-shaft in the differential case is provided with a third internal connection part;

[0009] The outer side surface of the connecting sleeve is connected with an actuator, and the connecting sleeve is driven by the actuator to move axially, so as to drive the differential device to switch between a disconnected state, a locked state and a normal operating state.

[0010] As an improvement of the present invention, when the differential is in a locked state, the first inner connection portion of the connecting sleeve cooperates with the first outer connection portion of the transmission half shaft, the second inner connection portion of the connecting sleeve cooperates with the second outer connection portion of the output half shaft, and the third outer connection portion of the connecting sleeve cooperates with the third inner connection portion of the differential case. In the differential locked state, there is no relative displacement between the differential case and the differential gear set, power is continuously transmitted to the output half shafts on both sides, and the output half shafts on both sides keep rotating synchronously.

[0011] As a further improvement of the present invention, when the differential is in a disconnected state, the first inner connection portion of the connecting sleeve is disconnected from the first outer connection portion of the transmission half-shaft, the second inner connection portion of the connecting sleeve is matched with the second outer connection portion of the output half-shaft, and the third outer connection portion of the connecting sleeve is disconnected from the third inner connection portion of the differential case. In the disconnected state of the differential, there is no power input to the differential case, and no power is transmitted between the output half-shafts on both sides.

[0012] As an improvement of the present invention, when the differential is in normal operating state, the first inner connection portion of the connecting sleeve cooperates with the first outer connection portion of the transmission half shaft, the second inner connection portion of the connecting sleeve cooperates with the second outer connection portion of the output half shaft, and the third outer connection portion of the connecting sleeve is disconnected from the third inner connection portion of the differential case. When the differential is in normal operating state, the differential case and the differential gear set are in a free state, and the power is respectively transmitted to the output half shafts on both sides through the differential gear set, and the output half shafts on both sides maintain synchronous or asynchronous rotation.

[0013] As a further improvement of the present invention, the differential gear set includes a first half-shaft gear, a second half-shaft gear and at least one group of planetary gears, the first half-shaft gear and the second half-shaft gear are arranged opposite to each other, and the center holes of the first half-shaft gear and the second half-shaft gear are respectively fixedly connected to a group of output half-shafts, the planetary gears are located in the middle position of the first half-shaft gear and the second half-shaft gear, and the planetary gears are respectively meshed with the first half-shaft gear and the second half-shaft gear, and the middle position of the planetary gear is movably connected with a gear shaft, and the gear shaft is fixedly connected to the inner wall of the differential housing.

[0014] As an improvement of the present invention, the outer surface of the differential housing is provided with first meshing teeth along the circumferential direction, and the first meshing teeth are connected to the power source.

[0015] As a further improvement of the present invention, the first inner connecting portion, the second inner connecting portion, the third inner connecting portion, the first outer connecting portion, the second outer connecting portion and the third outer connecting portion all adopt a spline connection structure.

[0016] As a further improvement of the present invention, the actuator includes an actuator motor, a fork mechanism and a connecting sleeve, the connecting sleeve is connected to the driving shaft of the actuator motor, the fork mechanism is engaged with the connecting sleeve, and when the actuator motor rotates, the connecting sleeve converts the rotational motion of the actuator motor into a linear displacement motion of the fork mechanism.

[0017] As a further improvement of the present invention, the shift fork mechanism includes a transverse support body, a shift fork rod and a connecting rod. The transverse support body is arranged parallel to the central axis of the connecting sleeve, and the transverse support body is slidably connected in the length direction; one end of the shift fork rod is vertically connected to the transverse support body, and the other end is clamped in the connecting sleeve; one end of the connecting rod is vertically connected to the transverse support body, and the other end is connected to the connecting sleeve. When the execution motor rotates, the connecting sleeve drives the connecting rod to move laterally, and then the transverse support body and the shift fork rod are both displaced laterally, and then the shift fork rod drives the connecting sleeve to move linearly, thereby realizing the differential state switching.

[0018] In addition, the present invention further discloses a vehicle suitable for multiple working conditions, in which the above-mentioned differential device is adopted.

[0019] After adopting such a design, the present invention has at least the following advantages:

[0020] The differential device of the present invention makes the inner and outer connecting parts of the connecting sleeve cooperate with the output half shaft and the differential housing by toggling the connecting sleeve. The differential integrates three functions of disconnection, locking and normal operation. When running on a normal road, the differential switches to a normal operation state to realize synchronous or asynchronous rotation of the wheels; when encountering a rough road, the differential switches to a locked state to make the wheels rigidly connected and the wheels rotate synchronously; when the vehicle switches between two-wheel drive or four-wheel drive, any differential at the front and rear wheel positions of the vehicle switches to a disconnected state, so that the corresponding wheels are in a free rotation state. The vehicle can choose to run in a two-wheel front drive or two-wheel rear drive mode, thereby reducing the energy consumption of the whole vehicle, so that different differential states can be switched in a targeted manner according to road conditions. The differential has the advantages of strong adaptability and a wide range of applicable occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Figure 1 It is a schematic diagram of the structural principle of the differential device in the present invention.

[0023] Figure 2 It is a schematic diagram of the internal connection of the differential device in the present invention under normal operating conditions.

[0024] Figure 3 It is a connection schematic diagram of the connecting sleeve under normal operating conditions in the present invention.

[0025] Figure 4 It is a schematic diagram of the internal connection of the differential device in the present invention in a locked state.

[0026] Figure 5 It is a connection schematic diagram of the connecting sleeve in the locked state in the present invention.

[0027] Figure 6 It is a schematic diagram of the internal connection of the differential device in the present invention when it is in a disconnected state.

[0028] Figure 7 It is a connection schematic diagram of the connecting sleeve in the disconnected state of the present invention.

[0029] The specific reference numerals in the accompanying drawings are:

[0030] 1-power source, 2-differential housing, 201-third inner connection part, 3-differential gear set, 4-first meshing teeth, 5-right output half shaft, 6-left output half shaft, 601-second outer connection part, 7-transmission half shaft, 701-first outer connection part, 8-connecting sleeve, 801-first inner connection part, 802-second inner connection part, 803-third outer connection part, 9-shift fork rod, 10-lateral support body; 11-executor motor, 12-drive shaft, 13-connecting sleeve, 14-connecting rod, 15-bearing. DETAILED DESCRIPTION

[0031] The present invention provides a differential device and a vehicle suitable for multiple working conditions, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 the present invention can be understood according to specific circumstances. Example

[0033] refer to Figure 1 As shown, this embodiment specifically discloses a differential device suitable for multiple working conditions, which includes a differential housing 2, an output half shaft, a transmission half shaft 7, a connecting sleeve 8 and an actuator.

[0034] The outer surface of the differential case 2 is provided with first meshing teeth 4 along the circumferential direction, and the first meshing teeth 4 are connected to the power source 1. In this embodiment, the differential case 2 is provided with shaft sleeves on both sides, and a set of output half shafts are movably connected in the shaft sleeves on each side, and the output half shafts and the shaft sleeves are movable in the circumferential direction, while the relative positions in the axial direction are fixed, and one end of the output half shaft is connected to the differential gear set 3, specifically, one end of the output half shaft is connected to the half shaft gear on the corresponding side, and the output half shaft is driven to rotate through the differential gear set 3.

[0035] Specifically, a differential gear set 3 is provided inside the differential case 2, and the differential gear set 3 includes a first side gear, a second side gear and at least one set of planetary gears. The first side gear and the second side gear are arranged opposite to each other, and the center holes of the first side gear and the second side gear are respectively fixedly connected to a set of output side gears, the planetary gears are located in the middle of the first side gear and the second side gear, and the planetary gears mesh with the first side gear and the second side gear respectively, and the middle position of the planetary gear is movably connected with a gear shaft, and the gear shaft is fixedly connected to the inner wall of the differential case 2. When the power source 1 provides power, the differential case 2 can be driven to rotate through the first meshing teeth 4, and then the differential case 2 drives the first side gear and the second side gear inside to rotate, and when the speeds of the first side gear and the second side gear are inconsistent, the power transmission ratio of the first side gear and the second side gear can be changed by rotating the planetary gear at the middle position. In order to realize the rotation of the differential housing 2, in this embodiment, bearings 15 are respectively provided on the outer surfaces of the sleeves on both sides of the differential housing 2. The bearings 15 can fix the differential housing 2 in the axial direction and keep the differential housing 2 rotating in the circumferential direction.

[0036] In this embodiment, the transmission half shaft 7 is coaxially arranged on the side of the end of a group of output half shafts, and the two ends of the connecting sleeve 8 are respectively sleeved on the end of the transmission half shaft 7 and the end of the output half shaft. Figure 1 As shown, in this embodiment, the left side of the differential housing 2 is connected to a left output half shaft 6, and the right side is connected to a right output half shaft 5. A transmission half shaft 7 is arranged on the left side of the left output half shaft, and a connecting sleeve 8 is arranged between the left output half shaft and the transmission half shaft 7.

[0037] At the same time, the sleeve position of the transmission half shaft 7 is provided with a first external connection part 701, and the sleeve position of the output half shaft is provided with a second external connection part 601; the inner walls at both ends of the connecting sleeve 8 are respectively provided with a first internal connection part 801 and a second internal connection part 802, and the outer surface of at least one end of the connecting sleeve 8 is provided with a third external connection part 803; the inner surface of the shaft sleeve on the side close to the transmission half shaft 7 in the differential housing 2 is provided with a third internal connection part 201; in this embodiment, the first internal connection part 801, the second internal connection part 802, the third internal connection part 201, the first external connection part 701, the second external connection part 601 and the third external connection part 803 preferably all adopt a spline connection structure, but a meshing structure, such as a gear structure, may also be used as an alternative.

[0038] Furthermore, an actuator is connected to the outer side of the connecting sleeve 8, and the connecting sleeve 8 is moved axially by the actuator, so that the connection relationship between the differential housing 2, the drive half shaft 7 and the output half shaft is changed, thereby driving the differential device to switch between the disconnected state, the locked state and the normal operating state.

[0039] Specifically, when the differential is in a locked state, such as Figure 4 and Figure 5 As shown, the first inner connection portion 801 of the connecting sleeve 8 cooperates with the first outer connection portion 701 of the transmission half shaft 7, that is, the inner spline at the left end of the connecting sleeve 8 in this embodiment is connected to the outer spline at the right end of the transmission half shaft 7; the second inner connection portion 802 of the connecting sleeve 8 cooperates with the second outer connection portion 601 of the output half shaft, that is, the inner spline at the right end of the connecting sleeve 8 in this embodiment is connected to the outer spline at the left end of the left output half shaft 6; the third outer connection portion 803 of the connecting sleeve 8 cooperates with the third inner connection portion 201 of the differential case 2, that is, the outer spline at the right end of the connecting sleeve 8 in this embodiment is connected to the inner spline of the left side sleeve of the differential case 2. When the differential is locked, the transmission half shaft 7 is rigidly connected to the output half shaft on the same side. At this time, the power is directly transmitted from the differential case 2 to the differential gear set 3, and there is no relative displacement between the gears of the differential gear set 3, and there is no relative displacement between the differential gear set 3 and the differential case 2, that is, the differential gear set 3 rotates with the differential case 2, and the power will be evenly transmitted to the output half shafts on both sides. The output half shafts on both sides always keep synchronous rotation, and the transmission half shaft 7 rotates synchronously with the output half shaft. In the differential lock state, the corresponding wheels are rigidly connected.

[0040] When the differential is in the disconnected state, Figure 6 and Figure 7 As shown, the first inner connection part 801 of the connecting sleeve 8 is disconnected from the first outer connection part 701 of the transmission half shaft 7, that is, the inner spline at the left end of the connecting sleeve 8 is disconnected from the outer spline at the right end of the transmission half shaft 7 in this embodiment, and no power is transmitted; the second inner connection part 802 of the connecting sleeve 8 cooperates with the second outer connection part 601 of the output half shaft, that is, the inner spline at the right end of the connecting sleeve 8 is connected to the outer spline at the left end of the left output half shaft 6 in this embodiment; the third outer connection part 803 of the connecting sleeve 8 is disconnected from the third inner connection part 201 of the differential case 2, that is, the outer spline at the right end of the connecting sleeve 8 is disconnected from the inner spline of the left shaft sleeve of the differential case 2 in this embodiment, and no power is transmitted; in the differential disconnected state, there is no connection relationship between the transmission half shaft 7 and the output half shaft on the same side. When the differential case 2 is disconnected from the power input, there is no power transmission process between the transmission half shaft 7 and the output half shaft, that is, in this disconnected state, the wheels connected on both sides rotate freely respectively, and the two will not affect each other.

[0041] More specifically, when the differential is in normal operation, such as Figure 2 and Figure 3As shown, the first inner connection portion 801 of the connecting sleeve 8 cooperates with the first outer connection portion 701 of the transmission half shaft 7, that is, the inner spline at the left end of the connecting sleeve 8 in this embodiment is connected to the outer spline at the right end of the transmission half shaft 7; the second inner connection portion 802 of the connecting sleeve 8 cooperates with the second outer connection portion 601 of the output half shaft, that is, the inner spline at the left end of the connecting sleeve 8 in this embodiment is connected to the outer spline at the left end of the left output half shaft 6; the third outer connection portion 803 of the connecting sleeve 8 is disconnected from the third inner connection portion 201 of the differential case 2, that is, the outer spline at the right end of the connecting sleeve 8 in this embodiment is disconnected from the inner spline at the left side of the differential case 2. When the differential is in normal operation, the transmission half shaft 7 is rigidly connected to the output half shaft on the same side, but the output half shafts on both sides of the differential case 2 can rotate synchronously or asynchronously. At this time, the differential case 2 and the differential gear set 3 are in a free state, and the power is transmitted to the output half shafts on both sides through the differential gear set 3. When driving in a straight line, the output half shafts on both sides keep rotating synchronously. When turning, the output half shafts of the inner circle and the outer circle produce a speed difference, and the output half shafts on both sides rotate asynchronously.

[0042] It should be noted that, in this embodiment, the third inner connecting portion 201 is arranged at the middle position of the shaft sleeve on the differential housing 2, and a smooth transition surface is provided between the third inner connecting portion 201 and the outer end surface of the shaft sleeve.

[0043] Furthermore, the actuator described in this embodiment serves as a power source 1 for driving the connecting sleeve 8 to move axially, and specifically includes an actuator motor 11, a fork mechanism and a linkage sleeve 13. The linkage sleeve 13 is connected to the drive shaft 12 of the actuator motor 11, and the fork mechanism is engaged with the linkage sleeve 13. When the actuator motor 11 rotates, the linkage sleeve 13 converts the rotational motion of the actuator motor 11 into a linear displacement motion of the fork mechanism. Specifically, the linkage sleeve 13 can be provided with a thread groove on the surface, and the thread groove is used to rotate and drive the fork mechanism to move horizontally, or the linkage sleeve 13 and the drive shaft 12 of the actuator motor 11 are set as a screw structure, that is, the drive shaft of the actuator motor 11 is set as a screw, and the center of the linkage sleeve 13 is provided with a thread structure. When the actuator motor 11 rotates, the linkage sleeve 13 moves axially along the drive shaft under the action of the thread, thereby driving the fork mechanism to move. The shift fork mechanism includes a transverse support body 10, a shift fork rod 9 and a connecting rod 14. The transverse support body 10 is arranged parallel to the central axis of the connecting sleeve 8, and the transverse support body 10 is slidably connected in the length direction; one end of the shift fork rod 9 is vertically connected to the transverse support body 10, and the other end is clamped in the connecting sleeve 8; one end of the connecting rod 14 is vertically connected to the transverse support body 10, and the other end is connected to the connecting sleeve 8. When the actuator motor 11 rotates, the connecting sleeve 13 drives the connecting rod 14 to move laterally, and then the transverse support body 10 and the shift fork rod 9 are both displaced laterally, and then the shift fork rod 9 shifts the connecting sleeve 8 to move linearly, thereby realizing the differential state switching.

[0044] It should be noted that the differential device in this embodiment can be applied to vehicles with part-time four-wheel drive. When the vehicle is switched to four-wheel drive, the differentials at the front and rear wheel positions can be kept in a locked state respectively. At this time, the power will be evenly distributed to the four wheels, which can enhance the vehicle's passing performance on rugged roads; when it is necessary to switch to two-wheel drive, the differential on either side of the front or rear wheel can be set to a disconnected state, while the differential on the other side remains in a normal operating state; at the same time, the existing two-wheel drive vehicles are divided into two modes, front drive and rear drive. The front drive is close to the power source 1, and the power loss is relatively small, but the front drive vehicle has poor controllability and the tires are easy to wear because it is responsible for both driving and steering; while the rear drive has better controllability, more stable and smooth driving, and better uphill ability. The vehicle using the differential of this embodiment can be more realistic. The road conditions can be more targeted to select the vehicle as front drive or rear drive, so that it can adapt to more road conditions and its versatility is better.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art may make some simple modifications, equivalent changes or modifications using the technical contents disclosed above, which all fall within the protection scope of the present invention.

Claims

1. A differential device suitable for multiple working conditions, characterized in that: It includes a differential housing, an output half shaft, a transmission half shaft, a connecting sleeve and an actuator. A differential gear set is provided inside the differential housing, and shaft sleeves are provided on both sides of the differential housing, and a group of output half shafts are movably connected in the shaft sleeves, and one end of the output half shaft is connected to the differential gear set, and the output half shaft is driven to rotate through the differential gear set; The transmission half-shaft is coaxially arranged on the side of the end of a group of output half-shafts, the two ends of the connecting sleeve are respectively sleeved on the transmission half-shaft end and the output half-shaft end, and the sleeved position of the transmission half-shaft is provided with a first external connection part, and the sleeved position of the output half-shaft is provided with a second external connection part; the inner walls at both ends of the connecting sleeve are respectively provided with a first internal connection part and a second internal connection part, and the outer surface of at least one end of the connecting sleeve is provided with a third external connection part; the inner surface of the sleeve on the side of the transmission half-shaft in the differential case is provided with a third internal connection part; The outer side of the connecting sleeve is connected to an actuator, and the connecting sleeve is driven by the actuator to move axially, so as to drive the differential device to switch between a disconnected state, a locked state and a normal operating state; The actuator includes an actuator motor, a fork mechanism and a linkage sleeve, wherein the linkage sleeve is connected to a driving shaft of the actuator motor, the fork mechanism is engaged with the linkage sleeve, and when the actuator motor rotates, the linkage sleeve converts the rotational motion of the actuator motor into a linear displacement motion of the fork mechanism; The shift fork mechanism includes a transverse support body, a shift fork rod and a connecting rod. The transverse support body is arranged parallel to the central axis of the connecting sleeve, and the transverse support body is slidably connected in the length direction; one end of the shift fork rod is vertically connected to the transverse support body, and the other end is clamped in the connecting sleeve; one end of the connecting rod is vertically connected to the transverse support body, and the other end is connected to the connecting sleeve. When the execution motor rotates, the connecting sleeve drives the connecting rod to move laterally, and then the transverse support body and the shift fork rod are both displaced laterally, and then the shift fork rod drives the connecting sleeve to move linearly to realize the differential state switching.

2. The differential device according to claim 1, characterized in that: When the differential is in a locked state, the first inner connection portion of the connecting sleeve cooperates with the first outer connection portion of the transmission half shaft, the second inner connection portion of the connecting sleeve cooperates with the second outer connection portion of the output half shaft, and the third outer connection portion of the connecting sleeve cooperates with the third inner connection portion of the differential case. In the differential locked state, the transmission half shaft is rigidly connected to the output half shaft on the corresponding side, the differential case and the differential gear set have no relative displacement, power is continuously transmitted to the output half shafts on both sides, and the output half shafts and the transmission half shafts on both sides of the differential case keep rotating synchronously.

3. The differential device according to claim 1, characterized in that: When the differential is in a disconnected state, the first inner connection portion of the connecting sleeve is disconnected from the first outer connection portion of the transmission half shaft, the second inner connection portion of the connecting sleeve is matched with the second outer connection portion of the output half shaft, and the third outer connection portion of the connecting sleeve is disconnected from the third inner connection portion of the differential case. In the disconnected state of the differential, there is no connection between the transmission half shaft and the output half shaft on the corresponding side, there is no power input to the differential case, and the transmission half shaft and the output half shaft both rotate freely.

4. The differential device according to claim 1, characterized in that: When the differential is in normal operation, the first inner connection portion of the connecting sleeve cooperates with the first outer connection portion of the transmission half shaft, the second inner connection portion of the connecting sleeve cooperates with the second outer connection portion of the output half shaft, and the third outer connection portion of the connecting sleeve is disconnected from the third inner connection portion of the differential case. When the differential is in normal operation, the transmission half shaft is rigidly connected to the output half shaft on the corresponding side, the differential case and the differential gear set are in a free state, and the power is transmitted to the output half shafts on both sides respectively through the differential gear set, and the output half shafts on both sides keep rotating synchronously or asynchronously.

5. The differential device according to any one of claims 1 to 4, characterized in that: The differential gear set includes a first half-shaft gear, a second half-shaft gear and at least one group of planetary gears. The first half-shaft gear and the second half-shaft gear are arranged opposite to each other, and the center holes of the first half-shaft gear and the second half-shaft gear are respectively fixedly connected to a group of output half-shafts. The planetary gears are located in the middle of the first half-shaft gear and the second half-shaft gear, and the planetary gears are respectively meshed with the first half-shaft gear and the second half-shaft gear. A gear shaft is movably connected to the middle position of the planetary gear, and the gear shaft is fixedly connected to the inner wall of the differential housing.

6. The differential device according to any one of claims 1 to 4, characterized in that: The outer surface of the differential case is provided with first meshing teeth along the circumferential direction, and the first meshing teeth are connected to a power source.

7. The differential device according to any one of claims 1 to 4, characterized in that: The first inner connecting portion, the second inner connecting portion, the third inner connecting portion, the first outer connecting portion, the second outer connecting portion and the third outer connecting portion all adopt a spline connection structure.

8. A vehicle suitable for multiple working conditions, characterized in that: The vehicle adopts the differential device as claimed in any one of claims 1 to 7.

Images