Differential system

Abstract

To provide a differential system which, being compact in volume, allows for easy installation in a vehicle and achieves both blocking and transmission of differential power.SOLUTION: A differential system includes a differential, a disconnect clutch, and a differential lock clutch. The differential comprises an outer shell and an inner shell, with the inner shell disposed inside the outer shell. The outer shell is connected to and transmits power to a front-stage transmission structure. The disconnect clutch is mounted on the outer shell and serves to engage or disengage the outer and inner shells. The differential lock clutch, also mounted on the outer shell, locks or unlocks the differential, and can lock the differential only when the differential and the front-stage transmission structure are in an engaged state. This configuration enables rational power distribution to the wheels of a vehicle and enhances the vehicle's ability to escape from challenging conditions.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of differentials, and more particularly to differential systems. [Background technology]

[0002] Automobiles are available in two-wheel drive and four-wheel drive configurations, and the vehicle can switch between two-wheel drive and four-wheel drive configurations as needed to save energy. Many vehicles are also equipped with a differential, whose primary function is to allow the left and right wheels to rotate at different speeds when the vehicle turns, allowing the vehicle to adapt to changing turning and road conditions. If one wheel loses grip (e.g., slips), the differential can transmit all of the torque to the slipping wheel, but a differential lock can limit or lock the function of the differential to ensure the vehicle can travel normally even on rough roads.

[0003] In the prior art, switching between vehicle drive modes requires the use of a clutch, and most clutches use a friction mechanism. Friction mechanisms are also often used to disconnect or connect power from a differential in an automobile. Summary of the Invention [Problem to be solved by the invention]

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: Both the friction type on / off clutch and the friction type differential lock are large in volume and inconvenient to install in a vehicle.

[0005] The present invention seeks to solve, at least to some extent, one of the technical problems in the related art.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a differential system that is small in volume, easy to install in a vehicle, and that realizes the interruption and transmission of differential power. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention proposes a differential system, which comprises: a differential including an outer shell and an inner shell, the inner shell being disposed within the outer shell, the outer shell being for transmission connection with a preceding transmission structure of the differential; a disconnection clutch attached to the outer shell for connecting or disconnecting the outer shell and the inner shell; a differential lock clutch mounted on the outer shell for locking or unlocking the differential; Including, The differential lock clutch can lock the differential only when the differential and the front transmission structure are in an engaged state.

[0008] In the differential system of the present invention, the on / off clutch connects or disconnects the outer shell of the differential to the front transmission structure, i.e., realizes the function of connecting or disconnecting the power transmission between the outer shell and the inner shell, and the differential locking clutch locks or unlocks the differential, thereby rationally distributing power to the wheels and improving the vehicle's ability to escape from difficult situations.The present invention integrates the on / off clutch and the differential locking clutch into the outer shell of the differential, which has the advantages of small volume, compact structure, and easy installation on the vehicle.

[0009] According to one embodiment of the present invention, the differential includes two side gears, a plurality of planetary gears, and a planetary gear shaft, the plurality of planetary gears being externally mounted on the planetary gear shaft, and the two side gears being arranged coaxially opposite each other, and both meshing with the planetary gears.

[0010] According to one embodiment of the present invention, the differential further includes a first movable end surface tooth, which is arranged between the outer shell and the inner shell and is axially movably connected to the outer shell, the outer wall of the first movable end surface tooth and the inner wall of the outer shell are meshed and connected by a spline, the inner shell is provided with an inner shell end surface tooth at an end close to the first movable end surface tooth, the disconnecting clutch is for controlling the axial movement of the first movable end surface tooth, and when the first movable end surface tooth and the inner shell end surface tooth mesh, the outer shell and the inner shell can rotate synchronously.

[0011] According to one embodiment of the present invention, the side gear is provided with an output shaft, the differential further includes second movable end surface teeth, the second movable end surface teeth are externally mounted on the output shaft and axially movably connected to the outer shell, the outer wall of the second movable end surface teeth and the inner wall of the outer shell are meshed and connected by a spline, the side gear is provided with axle shaft end surface teeth at an end close to the second movable end surface teeth, the differential lock clutch is for controlling the axial movement of the second movable end surface teeth, and when the second movable end surface teeth and the axle shaft end surface teeth mesh, the outer shell and the side gear can rotate synchronously.

[0012] According to one embodiment of the present invention, the outer shell includes a front outer shell and a rear outer shell provided opposite to each other, the connect / disconnect clutch and the differential lock clutch share one yoke, the yoke is exteriorly mounted on the front outer shell, and a plurality of iron cores are provided in the yoke along a circumferential direction, The connecting / disconnecting clutch is a movable engaging / disengaging disk having several (a few) first stepped portions arranged along a circumferential direction at a distance, and a first groove for attaching a magnetic steel piece provided in each of the first stepped portions; a magnetically conductive disc disposed above the magnetic steel; a disconnecting coil that is attached to the iron core and generates an electromagnetic force when energized; Includes.

[0013] According to one embodiment of the present invention, the differential lock clutch is a differential-lock movable disk having several (a few) second step portions spaced apart and arranged along the circumferential direction, wherein the second step portions are provided with second grooves for attaching the magnetic steel, the second step portions and the first step portions are arranged alternately, and the bottom end faces of the second step portions and the bottom end faces of the first step portions are positioned on the same plane; a differential lock magnetically conductive disk disposed above the magnetic steel; a differential lock coil that is attached to the iron core and generates an electromagnetic force when energized; Includes.

[0014] According to one embodiment of the present invention, the position sensor assembly further comprises: a differential lock sensor coil and a disconnection sensor coil mounted on the iron core; a sensor core provided in the yoke; a connect / disconnect sensor magnetic-permeable disk provided in the first step portion and adjacent to the sensor core; a differential lock sensor magnetic permeable disk provided in the second step portion and adjacent to the sensor core; Includes.

[0015] According to one embodiment of the present invention, the engaging / disengaging movable disc is provided between the differential-locking movable disc and the yoke, and when neither the engaging / disengaging coil nor the differential-locking coil is energized, the engaging / disengaging movable disc and the differential-locking movable disc abut against each other.

[0016] According to one embodiment of the present invention, the coupling gear further includes a first pressing ring, a first elastic member, a first coupling tooth positioning pin, a second pressing ring, a second elastic member, and a second coupling tooth positioning pin, the first coupling tooth positioning pin is provided on the first movable end surface tooth, the first coupling tooth positioning pin is provided facing the movable engagement / disengagement disk after penetrating the front outer shell, the first pressing ring is provided on the inner wall of the front outer shell, and the first elastic member is compressible between the first pressing ring and the first movable end surface tooth; The second coupling tooth positioning pin is provided on the second movable end surface tooth, and the second coupling tooth positioning pin is provided opposite the differential lock movable disk after penetrating the front outer shell, the second pressure ring is provided on the inner wall of the front outer shell, and the second elastic member is compressible between the second pressure ring and the second movable end surface tooth.

[0017] According to one embodiment of the present invention, when the differential and the front-stage transmission structure are disconnected by the disconnecting clutch, the magnetic attraction force generated after the differential lock coil is energized alone is smaller than the sum of the elastic forces due to compression of the first elastic member and the second elastic member.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0019] Various other benefits and advantages will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Furthermore, like reference numerals refer to like parts throughout the drawings. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic diagram of the overall structure of a differential system according to an embodiment of the present invention; [Figure 2] 1 is a cross-sectional view of a differential system according to one embodiment of the present invention; [Figure 3] 1 is an exploded view of a differential system according to one embodiment of the present invention; [Figure 4] 1 is an exploded view of a differential system according to an embodiment of the present invention, taken from a different angle; DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the embodiments of the present invention will be described in detail. The described embodiments are illustrated in the drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are used only to interpret the present invention and should not be understood as limitations on the present invention. On the contrary, the embodiments of the present invention include all variations, modifications, and equivalents within the spirit and scope of the present invention as defined by the appended claims.

[0022] As shown in FIGS. 1 to 4, an embodiment of the present invention provides a differential system including a differential, a disengagement clutch, and a differential-lock clutch.

[0023] The differential includes an outer shell and an inner shell 3, with the inner shell 3 disposed within the outer shell. The outer shell is rotatable relative to the inner shell 3. For ease of assembly, the outer shell is designed as a separate body and includes a front outer shell 1 and a rear outer shell 2. The outer shell is configured to be power-transmittingly connected to the upstream transmission structure of the differential. The outer shell may be provided with several transmission structures for achieving power-transmitting connection with the upstream transmission structure. For example, the outer shell may be coaxially connected with a large gear, which is power-transmittingly connected to the upstream transmission structure.

[0024] The disconnecting clutch is mounted on the outer shell and configured to connect or disconnect the outer shell and the inner shell. When the outer shell and the inner shell are connected, the outer shell and the inner shell rotate synchronously. When the outer shell and the inner shell are disconnected, the outer shell and the inner shell can rotate independently.

[0025] The differential-lock clutch is mounted on the outer shell and configured to lock or unlock the differential. Any type of clutch can be used as the connecting / disconnecting clutch or the differential-locking clutch as needed, as long as the clutch can provide linear displacement. For example, an electromagnetic clutch, a fluid coupling clutch, or the like may be selected, which have advantages such as high transmission efficiency and fast response. The clutch may be monostable or bistable.

[0026] The differential lock clutch can lock the differential only when the differential and the upstream transmission structure are in an engaged state. According to the inventor's research, when the disconnecting clutch is in a disengaged state, the differential lock may lock, causing power to be output to one side, creating an element of uncertainty during driving. To prevent this from happening, a mechanical interlock is adopted for the disconnecting clutch and the differential lock clutch, so that the differential lock clutch can only be engaged when the disconnecting clutch is in an engaged state, and the electromagnetic differential lock clutch cannot be engaged or locked when the disconnecting clutch is disengaged.

[0027] In the differential system of the embodiment of the present invention, the on / off clutch connects or disconnects the outer shell of the differential with the front transmission structure, i.e., realizes the function of connecting or disconnecting the power transmission between the outer shell and the inner shell, and the differential locking clutch locks or unlocks the differential, thereby rationally distributing power to the wheels and improving the vehicle's ability to escape from difficult situations. The embodiment of the present invention integrates the on / off clutch and the differential locking clutch into the outer shell of the differential, which has the advantages of small volume, compact structure, and easy installation on the vehicle.

[0028] In some embodiments, as shown in Fig. 2, the differential includes two side gears (half shaft gears), a plurality of planetary gears 5, and a planetary gear shaft 6, where the plurality of planetary gears 5 are mounted on the planetary gear shaft 6, and two side gears are provided coaxially and opposite to each other, and both mesh with the planetary gears 5. The two side gears are a first side gear 4 and a second side gear 8, respectively. The first side gear 4 and the second side gear 8 can be connected to an axle shaft (half shaft) to transmit power to the wheels.

[0029] The differential further includes first movable end teeth 32, which are provided between the outer shell and the inner shell 3 and are axially movably connected to the outer shell. The outer wall of the first movable end teeth 32 and the inner wall of the outer shell are meshed with each other by splines, and the inner shell 3 has inner shell end teeth at an end close to the first movable end teeth 32. The disconnecting clutch controls the axial movement of the first movable end teeth 32. When the first movable end teeth 32 mesh with the inner shell end teeth, the outer shell and the inner shell 3 can rotate synchronously. At this time, engine power is transmitted to the inner shell 3 via the outer shell, and the inner shell 3 transmits the power to two side gears (4, 8) and further to the axle shaft and wheels. The side gears are provided with output shafts, which are connected to the axle shafts. When the first movable end tooth 32 and the inner shell end tooth are cut, the outer shell and the inner shell 3 can rotate independently, and a first bearing 7 is provided between the outer shell and the inner shell 3 to reduce friction between them. Illustratively, the first bearing 7 is a needle bearing, which has the advantages of high reliability, high precision, and high strength.

[0030] The differential further includes second movable end teeth 19, which are mounted on the output shaft and axially movably connected to the outer shell. The outer wall of the second movable end teeth 19 is meshed with the inner wall of the outer shell by a spline. The side gears are provided with axle shaft end teeth (half shaft end teeth) at the ends closest to the second movable end teeth 19. The differential lock clutch controls the axial movement of the second movable end teeth 19. When the second movable end teeth 19 mesh with the axle shaft end teeth, the outer shell and side gears can rotate synchronously. The axle shaft end teeth may be selectively provided on one of the side gears. At this time, engine power is transmitted to the inner shell 3 via the outer shell, locking the side gears, so that the two axle shafts and wheels rotate synchronously.

[0031] Illustratively, the axle shaft end face teeth are provided on the second side gear 8 and are provided on the same side as the inner shell end face teeth, thereby further reducing the volume occupied by the entire differential system.

[0032] In some embodiments, as shown in Figures 1 to 4, both the on / off clutch and the differential lock clutch are bistable electromagnetic clutches. The on / off clutch and the differential lock clutch share a single yoke 9, which is mounted on the front shell 1 and has multiple iron cores arranged along the circumferential direction.

[0033] The make-and-break clutch includes a make-and-break movable disk 14, a make-and-break magnetic-permeable disk 24, and a make-and-break coil 25. The make-and-break movable disk 14 has several (e.g., a plurality) first stepped portions spaced apart and arranged along the circumferential direction, and the first stepped portions are provided with first grooves for attaching magnetic steel (magnetic steel, e.g., permanent magnets) 23. The magnetic steel 23 and the make-and-break coil 25 are provided opposite each other, facilitating bonding between the first stepped portions and the magnetic steel 23. The number of first stepped portions is designed according to actual needs. For example, the number of first stepped portions is two. The make-and-break magnetic-permeable disk 24 is provided above the magnetic steel 23. The make-and-break coil 25 is mounted on the iron core and generates electromagnetic force when energized. The energization can be switched between forward and reverse to generate magnetic poles of different directions.

[0034] In one example, two adjacent disconnecting coils 25 are set as one pair. After energization, the two disconnecting coils 25 in the same pair form a U-shaped magnetic path with the yoke 9, and form a closed loop magnetic path through the corresponding magnetic steel 23 and the disconnecting magnetic-permeable disk 24, thus effectively avoiding the occurrence of magnetic leakage and improving the electromagnetic utilization rate.

[0035] The differential-lock clutch includes a movable differential-lock disk 15, a magnetically permeable differential disk 22, and a differential-lock coil 26. The movable differential-lock disk 15 has several (e.g., multiple) second stepped portions spaced apart and arranged along the circumferential direction. The second stepped portions have second grooves for attaching magnetic steel members 23. The second stepped portions and the first stepped portions are alternately arranged, and the bottom end faces of the second stepped portions and the bottom end faces of the first stepped portions are flush with each other. The magnetically permeable differential disk 22 is arranged above the magnetic steel member 23. The magnetic steel member 23 and the differential-lock coil 26 are arranged opposite each other, facilitating the joining of the second stepped portions and the magnetic steel member 23. The number of second stepped portions can be designed according to actual needs. For example, the number of second stepped portions is two. The differential-lock coil 26 is mounted on an iron core and generates electromagnetic force when energized. The current can be switched between forward and reverse current so that magnetic poles of different directions are generated.

[0036] Similar to the make-and-break coil 25, two adjacent differential lock coils 26 are set as a pair, and have the same technical effect as the make-and-break coil 25.

[0037] In some embodiments, to detect the positions of the engage / disengage movable disc 14 and the diff-lock movable disc 15, the differential system further includes a position sensor assembly, which includes a diff-lock sensor coil 27, an engage / disengage sensor coil 28, a sensor core 30, an engage / disengage sensor magnetic disc 29, and a diff-lock sensor magnetic disc 31.

[0038] The differential lock sensor coil 27 and the make / break sensor coil 28 are mounted on the cores. The differential lock sensor coil 27 faces the second step, and the make / break sensor coil 28 faces the first step. A sensor core 30 is mounted on the yoke 9. A make / break sensor magnetically permeable disk 29 is mounted on the first step and adjacent to the sensor core 30. A differential lock sensor magnetically permeable disk 31 is mounted on the second step and adjacent to the sensor core 30. The operating principle of the position sensor assembly is based on the law of magnetic induction. That is, when a conductor moves through a magnetic field, an induced electromotive force is generated at both ends of the conductor. Specifically, when the differential lock sensor coil 27 approaches the differential lock moving disk 15 and / or the make / break sensor coil 28 approaches the moving disk 14, the magnetic field of the moving disk itself affects the magnetic field distribution around the sensor coils. As a result, the magnetic flux in the sensor coils changes. Through processing such as amplification and filtering, the position of the moving disk can be determined.

[0039] The make-and-break movable disc 14 is provided between the diff-lock movable disc 15 and the yoke 9, and when neither the make-and-break coil 25 nor the diff-lock coil 26 is energized, the make-and-break movable disc 14 and the diff-lock movable disc 15 abut against each other. Even if the diff-lock coil 26 is energized, the make-and-break movable disc 14 does not leave any movable space in the diff-lock movable disc 15.

[0040] The differential of the differential system further includes a first retaining ring 10 , a first elastic member 11 , a first coupling tooth positioning pin 12 , a second retaining ring 21 , a second elastic member 20 and a second coupling tooth positioning pin 18 .

[0041] A first coupling tooth positioning pin 12 is provided on the first movable end surface tooth 32, and the first coupling tooth positioning pin 12 is provided opposite the movable connect / disconnect disk 14 after penetrating the front outer shell 1. A first pressure ring 10 is provided on the inner wall of the front outer shell 1, and a first elastic member 11 can be compressed between the first pressure ring 10 and the first movable end surface tooth 32. The first pressure ring 10 may be fixed to the front outer shell 1 by press-fitting. By controlling the axial movement of the first coupling tooth positioning pin 12, the connecting operation with the first movable end surface tooth 32 can be performed.

[0042] A second coupling tooth positioning pin 18 is provided on the second movable end surface tooth 19, and the second coupling tooth positioning pin 18 is provided opposite the differential lock movable disc 15 after penetrating the front outer shell 1. A second holding ring 21 is provided on the inner wall of the front outer shell 1, and a second elastic member 20 can be compressed between the second holding ring 21 and the second movable end surface tooth 19. The second holding ring 21 may be fixed to the front outer shell 1 by press-fitting. By controlling the axial movement of the second coupling tooth positioning pin 18, the coupling operation with the second movable end surface tooth 19 can be performed.

[0043] When the differential and the front-stage transmission structure are disconnected by the disconnecting clutch, the magnetic attractive force generated after the differential-lock coil 26 is energized alone is smaller than the sum of the elastic forces due to compression of the first elastic member 11 and the second elastic member 20. This forms a mechanical interlock between the disconnecting clutch and the differential-lock clutch, allowing the differential-lock clutch to perform an engaging operation only when the disconnecting clutch is in an engaged state, and the differential-lock electromagnetic clutch cannot be engaged or locked when the disconnecting clutch is disengaged.

[0044] The bistable self-holding of the electromagnetic clutch is achieved by using an elastic member and magnetic steel 23, respectively, so that no current needs to be applied when maintaining the separated or joined state, thereby saving energy consumption.

[0045] A second bearing 13 is provided on the outside of the differential, and the second bearing 13 presses the first coupling tooth positioning pin 12. Specifically, the outer ring of the second bearing 13 is connected to the inner wall of the movable connect / disconnect disc 14, and the inner ring of the second bearing 13 is for abutting against the first coupling tooth positioning pin 12. In one example, other movable members may be provided between the second bearing 13 and the first coupling tooth positioning pin 12 to achieve power transmission.

[0046] A movable disc 17 is provided on the outside of the differential to form a power transmission path between the movable differential-lock disc 15 and the second coupling tooth positioning pin 18, and the movable disc 17 is connected to the second coupling tooth positioning pin 18. A third bearing 16 is provided between the movable disc 17 and the movable differential-lock disc 15 to enable relative rotation between the movable disc 17 and the movable differential-lock disc 15. Specifically, the outer ring of the third bearing 16 is connected to the inner wall of the movable differential-lock disc 15, and the inner ring of the third bearing 16 is connected to one end of the movable disc 17.

[0047] It should be noted that in describing the present invention, terms such as "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Also, in describing the present invention, unless otherwise specified, "plurality" means two or more.

[0048] In the present invention, unless otherwise clearly specified or limited, terms such as "attaching," "connecting," "connecting," and "fixing" should be understood in a broad sense. For example, they may be fixedly connected, detachably connected, or integrated. They may also be mechanically connected or electrically connected. They may also be directly connected, indirectly connected via an intermediate medium, or may refer to internal communication between two elements or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0049] In the present invention, unless otherwise clearly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first feature and the second feature are in direct contact with each other, or that the first feature and the second feature are in indirect contact with each other via an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or may simply indicate that the horizontal height of the first feature is higher than that of the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or may simply indicate that the horizontal height of the first feature is smaller than that of the second feature.

[0050] In describing the present invention, orientations or positional relationships indicated by terms such as "left," "right," "front," and "rear" are based on orientations or positional relationships shown in the drawings, and are intended only to facilitate and simplify the description of the present invention. They do not indicate or suggest that the devices, elements, or structures referred to have a particular orientation or must be configured or operated in a particular orientation, and should not be understood as limitations on the present invention.

[0051] Any procedure or method description depicted in a flowchart or otherwise herein represents a module, segment, or portion of code that includes one or more executable instructions for implementing specific logical functions or procedure steps, and it should be understood by those skilled in the art to which embodiments of the present invention pertain that the scope of the preferred embodiments of the present invention includes other implementations that perform functions instead of the order shown or discussed, essentially simultaneously or in reverse order depending on the functionality involved.

[0052] In the description herein, references to "one embodiment," "some embodiments," "examples," "specific examples," and "some examples" mean that the specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. Exemplary references to the above terms herein do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics may be combined as appropriate in any one or more embodiments or examples.

[0053] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and should not be understood as limitations of the present invention, and that those skilled in the art can change, modify, substitute, or change the above embodiments within the scope of the present invention. [Explanation of symbols]

[0054]

[0023] 1 - front outer shell, 2 - rear outer shell, 3 - inner shell, 4 - first side gear, 5 - planetary gear, 6 - planetary gear shaft, 7 - first bearing, 8 - second side gear, 9 - yoke, 10 - first retaining ring, 11 - first elastic member, 12 - first coupling tooth positioning pin, 13 - second bearing, 14 - separating movable disc, 15 - differential lock movable disc, 16 - third bearing, 17 - movable disc, 18 - second coupling tooth positioning pin Positioning pin, 19 - second movable end surface tooth, 20 - second elastic member, 21 - second retaining ring, 22 - differential lock magnetic permeable disk, 23 - magnetic steel, 24 - disconnecting magnetic permeable disk, 25 - disconnecting coil, 26 - differential lock coil, 27 - differential lock sensor coil, 28 - disconnecting sensor coil, 29 - disconnecting sensor magnetic permeable disk, 30 - sensor core, 31 - differential lock sensor magnetic permeable disk, 32 - first movable end surface tooth.

Claims

1. A differential system comprising: A differential including an outer shell and an inner shell (3), the inner shell (3) being disposed within the outer shell, the outer shell being for transmission connection with a front transmission structure of the differential; a disconnection clutch attached to the outer shell for connecting or disconnecting the outer shell and the inner shell; a differential lock clutch mounted on the outer shell for locking or unlocking the differential; Including, A differential system, characterized in that the differential-lock clutch can lock the differential only when the differential and the front-stage transmission structure are in a connected state.

2. 2. The differential system according to claim 1, wherein the differential includes two side gears, a plurality of planetary gears (5), and a planetary gear shaft (6), the plurality of planetary gears (5) being externally mounted on the planetary gear shaft (6), and the two side gears are provided coaxially opposite to each other, and both are meshed with the planetary gears (5).

3. 3. The differential system according to claim 2, further comprising: first movable end teeth (32), the first movable end teeth (32) being provided between the outer shell and the inner shell (3) and axially movable connected to the outer shell; an outer wall of the first movable end teeth (32) being meshed with an inner wall of the outer shell by a spline; inner shell end teeth being provided on the inner shell (3) at an end close to the first movable end teeth (32); the disconnecting clutch is for controlling the axial movement of the first movable end teeth (32); and when the first movable end teeth (32) and the inner shell end teeth mesh, the outer shell and the inner shell (3) are capable of synchronous rotation.

4. 4. The differential system according to claim 3, wherein the side gear is provided with an output shaft, the differential further includes second movable end surface teeth (19), the second movable end surface teeth (19) are externally mounted on the output shaft and are axially movably connected to the outer shell, the outer wall of the second movable end surface teeth (19) and the inner wall of the outer shell are meshed with each other by a spline, the side gear is provided with axle shaft end surface teeth at an end close to the second movable end surface teeth (19), the differential lock clutch is for controlling the axial movement of the second movable end surface teeth (19), and when the second movable end surface teeth (19) and the axle shaft end surface teeth mesh with each other, the outer shell and the side gear can rotate synchronously.

5. The outer shell includes a front outer shell (1) and a rear outer shell (2) provided opposite to each other, the connect / disconnect clutch and the differential lock clutch share one yoke (9), the yoke (9) is externally mounted on the front outer shell (1), and the yoke (9) is provided with a plurality of iron cores along the circumferential direction, The connecting / disconnecting clutch is a movable engaging / disengaging disk (14) having several first stepped portions spaced apart and arranged along a circumferential direction, the first stepped portions being provided with first grooves for mounting magnetic steel (23); a magnetically conductive disc (24) provided above the magnetic steel (23); a disconnecting coil (25) that is wrapped around the iron core and generates an electromagnetic force when energized; 5. The differential system of claim 4, comprising:

6. The differential lock clutch is a differential-lock movable disk (15) having several second stepped portions spaced apart and arranged along a circumferential direction, the second stepped portions having second grooves for attaching the magnetic steel (23), the second stepped portions and the first stepped portions alternately arranged, and bottom end faces of the second stepped portions and the first stepped portions are positioned on the same plane; A differential lock magnetically conductive disk (22) provided above the magnetic steel (23); a differential lock coil (26) that is fitted to the iron core and generates an electromagnetic force when energized; 6. The differential system of claim 5, comprising:

7. and a position sensor assembly, the position sensor assembly comprising: a differential lock sensor coil (27) and a disconnection sensor coil (28) mounted on the iron core; a sensor core (30) provided in the yoke (9); a make / break sensor magnetically conductive disk (29) provided in the first step portion and adjacent to the sensor core (30); a differential lock sensor magnetically conductive disk (31) provided in the second step portion and adjacent to the sensor core (30); 7. The differential system of claim 6, comprising:

8. 8. The differential system according to claim 7, wherein the movable make-and-break disk (14) is provided between the movable differential-lock disk (15) and the yoke (9), and when neither the make-and-break coil (25) nor the differential-lock coil (26) is energized, the movable make-and-break disk (14) and the movable differential-lock disk (15) abut against each other.

9. The device further includes a first pressing ring (10), a first elastic member (11), a first coupling tooth positioning pin (12), a second pressing ring (21), a second elastic member (20), and a second coupling tooth positioning pin (18), the first coupling tooth positioning pin (12) is provided on the first movable end surface tooth (32), the first coupling tooth positioning pin (12) is provided facing the movable engagement / disengagement disk (14) after penetrating the front outer shell (1), the first holding ring (10) is provided on the inner wall of the front outer shell (1), and the first elastic member (11) can be compressed between the first holding ring (10) and the first movable end surface tooth (32); 9. The differential system according to claim 8, wherein the second coupling tooth positioning pin (18) is provided on the second movable end surface tooth (19), the second coupling tooth positioning pin (18) is provided opposite the differential lock movable disc (15) after penetrating the front outer shell (1), the second pressing ring (21) is provided on the inner wall of the front outer shell (1), and the second elastic member (20) is compressible between the second pressing ring (21) and the second movable end surface tooth (19).

10. 10. The differential system according to claim 9, wherein when the differential and the upstream transmission structure are disconnected by the disconnecting clutch, the magnetic attraction force generated after the differential lock coil (26) is energized alone is smaller than the sum of the elastic forces due to compression of the first elastic member (11) and the second elastic member (20).

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