Differential assembly and vehicle

Abstract

The application provides a differential assembly, which comprises a differential housing, a transmission clutch assembly arranged on the right side of the differential housing and a differential clutch assembly arranged on the left side of the differential housing; the state of the differential assembly can be switched by controlling the states of a transmission electromagnetic actuator and a differential electromagnetic actuator, so that the differential assembly can be switched among a differential state, a power-off state and a differential locking state according to needs, so as to avoid the phenomenon of power reverse dragging of the vehicle when running at high speed and improve the escape ability of the vehicle when running on uneven road; in addition, in the differential locking state, the power transmission route of the differential assembly is optimized, so that the power of the differential housing can only be transmitted to the left half axle gear through the planetary gear sleeve and the differential clutch ring in turn, the uniformity of the force received by the planetary gear sleeve and the differential clutch ring is effectively ensured, the torsional deformation of the planetary gear sleeve and the differential clutch ring due to uneven force is avoided, and the service life of the planetary gear sleeve and the differential clutch ring is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of automobile transmission, and particularly relates to a differential assembly and a vehicle. BACKGROUND

[0002] The differential assembly is an important component of an automobile; when the automobile turns, it can adjust the left and right wheels to roll at different speeds to ensure the stable operation of the automobile. However, the current differential assembly has limited functions and cannot meet the requirements of customers; for example, when the automobile is running at high speed, the power source is still connected with the differential assembly, which may cause the phenomenon of power reverse dragging and aggravate energy consumption; for another example, when the automobile runs on a bad road surface such as a muddy road surface or an icy road surface, the differential assembly self-adapts the rotation speed of the wheels on both sides, which may cause the situation that one side of the wheel is stationary on the bad road surface and the other side of the wheel is sliding on the good road surface, resulting in the problem that the automobile is limited to run.

[0003] In order to solve the above technical problems, the invention patent with the application number 202211387362.1 discloses a differential assembly with disconnection and locking functions, which is provided with a differential clutch assembly and a transmission clutch assembly on the left and right sides of the differential housing, respectively, realizes the power transmission and disconnection between the planetary gear carrier and the differential housing through the transmission clutch assembly, and realizes the power transmission and disconnection between the left half axle gear and the differential housing through the differential clutch assembly; but when the differential assembly needs to work in the differential locking mode, since the transmission clutch assembly and the differential clutch assembly are both in the power connection state, the torque of the differential housing will be transmitted to the planetary gear carrier through two different paths, wherein the transmission path one is that the torque of the differential housing is transmitted to the right side of the planetary gear carrier through the transmission clutch assembly; the transmission path two is that the torque of the differential housing is transmitted to the left half axle gear through the differential clutch assembly, and then transmitted to the planetary gear carrier; since the transmission losses (such as friction losses) exist in the two transmission paths, and the transmission losses of the two are difficult to ensure consistent, the planetary gear carrier bears the torque with the same direction and different sizes at two positions (i.e. the right end and the gear shaft position), which is easy to cause the torsional deformation of the planetary gear carrier, not only reduces the service life of the planetary gear carrier, but also affects the normal operation of the differential assembly. SUMMARY

[0004] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a differential assembly and a vehicle, which have the functions of power disconnection, differential and differential locking, and ensure that the power of the differential housing can only be transmitted to the left half axle gear through the planetary gear sleeve in the differential locking function, so as to solve the problem that the planetary gear sleeve is easy to be torsionally deformed when the different sections of the planetary gear sleeve bear the power transmitted from the differential housing and the left half axle, and improve the service life of the planetary gear sleeve.

[0005] To achieve the above object and other related objects, the differential assembly provided by the present application comprises a differential housing, an annular gear for driving the differential housing to rotate, a transmission clutch assembly arranged on the right side of the differential housing, and a differential clutch assembly arranged on the left side of the differential housing; the differential housing is internally provided with a planetary gear sleeve, a planetary gear, and left and right half axle gears in meshing transmission with the planetary gear; the planetary gear is installed in the planetary gear sleeve through a planetary gear shaft; the transmission clutch assembly comprises a transmission electromagnetic actuator, a first reset spring, and a transmission clutch ring; the transmission clutch ring is fixed in the circumferential direction of the differential housing and can move axially relative to the differential housing; when the transmission electromagnetic actuator is energized, the transmission clutch ring is driven to move axially in the direction of approaching the planetary gear sleeve and is finally connected with the planetary gear sleeve to be fixed in the circumferential direction; when the transmission electromagnetic actuator is de-energized, the first reset spring drives the transmission clutch ring to move axially in the direction of moving away from the planetary gear sleeve and is finally disconnected with the planetary gear sleeve; the differential clutch assembly comprises a differential electromagnetic actuator, a second reset spring, and a differential clutch ring; the differential clutch ring is fixed in the circumferential direction of the planetary gear sleeve and can move axially relative to the planetary gear sleeve; the second reset spring is located between the differential clutch ring and the left half axle gear; when the differential electromagnetic actuator is energized, the differential electromagnetic actuator drives the differential clutch ring to move axially in the direction of approaching the left half axle gear and is finally connected with the left half axle gear to be fixed in the circumferential direction; when the transmission electromagnetic actuator is energized and the differential electromagnetic actuator is de-energized, the power of the differential housing can be transmitted to the planetary gear sleeve, so that the differential assembly has a differential function; when the transmission electromagnetic actuator is de-energized and the differential electromagnetic actuator is de-energized, the power transmission between the differential housing and the planetary gear sleeve is disconnected, so as to solve the problem of power reverse dragging; when the transmission electromagnetic actuator is energized and the differential electromagnetic actuator is energized, at this time, the differential housing, the planetary gear sleeve, the half axle gear, and the planetary gear rotate synchronously to realize differential locking, in this state, the power of the differential housing can only be transmitted to the left half axle gear through the planetary gear sleeve, effectively ensuring the uniformity of the force acting on the planetary gear sleeve, avoiding the torsional deformation of the planetary gear sleeve due to uneven force, and improving the service life of the planetary gear sleeve.

[0006] Preferably, an intermediate disc is arranged between the differential electromagnetic actuator and the differential clutch ring, the intermediate disc is located outside the differential housing; at least one second transmission axial member is arranged on the side of the intermediate disc facing the differential clutch ring, and a second through hole is arranged on the differential housing for the second transmission axial member to pass through; the differential electromagnetic actuator pushes the differential clutch ring to move axially in the direction of approaching the left half axle gear through the intermediate disc, so as to ensure the stability of the pushing.

[0007] Preferably, the outer periphery of the differential clutch ring is provided with at least one differential axial boss, and the planetary gear cover is internally provided with a driving slot for the differential axial boss to enter and exit; when the differential axial boss enters the driving slot, the driving slot drives the differential clutch ring to rotate through the differential axial boss; the side of the differential clutch ring facing the left half axle gear is provided with a differential connection tooth, and the left half axle gear is provided with a differential combination tooth matched with the differential connection tooth; the differential clutch ring and the planetary gear cover are circumferentially linked or the circumferential linkage is released by controlling the differential axial boss to enter and exit the driving slot.

[0008] Preferably, the differential connection tooth is a dog tooth, so as to facilitate the transmission of high torque.

[0009] Preferably, the differential axial boss has a driven surface, and the driving slot has a driving surface matched with the driven surface; when the driving surface drives the driven surface to rotate, the differential clutch ring moves axially towards the left half axle gear, so as to realize the stability of the combination of the differential clutch ring and the left half axle gear.

[0010] The driven surface is a left-to-right outwardly extending inclined surface; when the driving slot rotates to the driving surface matched with the corresponding driven surface, if the driving slot continues to rotate, the driving surface will exert a thrust perpendicular to the driven surface on the driven surface, and the thrust can be decomposed into a circumferential component and an axial component.

[0011] Preferably, the driven surface is a left-to-right outwardly extending inclined surface, and the outwardly inclined angle of the driven surface is 3°-5°.

[0012] Preferably, the side of the transmission clutch ring close to the planetary gear cover is provided with a transmission connection tooth, and the side of the planetary gear cover close to the transmission clutch ring is provided with a transmission combination tooth engaged with the transmission connection tooth.

[0013] Preferably, the side of the transmission clutch ring close to the transmission electromagnetic actuator is provided with at least one first transmission axial part, and the differential housing is provided with a first through hole for the first transmission axial part to pass through.

[0014] Preferably, a chuck towards the planetary gear cover is arranged between the transmission clutch ring and the transmission electromagnetic actuator; the chuck is located outside the differential housing, and the chuck and the second transmission axial part are detachably fixedly connected; the first return spring is limited between the chuck and the differential housing, so that the power of the transmission electromagnetic actuator is stably transmitted to the transmission clutch ring through the chuck.

[0015] The application also provides a vehicle comprising the above-mentioned differential assembly.

[0016] As described above, the differential assembly and the vehicle provided by the application have the following beneficial effects:

[0017] The differential assembly of this invention can switch the state of the differential assembly by controlling the states of the transmission electromagnetic actuator and the differential electromagnetic actuator, allowing the differential assembly to switch between differential state, power disconnect state, and differential lock state as needed. This avoids power back-dragging during high-speed vehicle operation and improves the vehicle's ability to get out of trouble on uneven roads. Furthermore, in the differential lock state, since the power of the differential housing can only be transmitted to the left half-shaft gear sequentially through the planetary gear sleeve and differential clutch ring, the uniformity of force on the planetary gear sleeve and differential clutch ring is effectively ensured, preventing torsional deformation due to uneven force and improving the service life of the planetary gear sleeve and differential clutch ring. In addition, the driven surface on the differential axial boss and the driving surface in the planetary gear sleeve drive groove can lock the axial position of the differential clutch ring when they mate, ensuring the stability of the differential clutch ring when engaged with the left half-shaft gear. Attached Figure Description

[0018] Figure 1 This is an axial cross-sectional view of the differential assembly in this invention.

[0019] Figure 2 for Figure 1 Isometric half-section view of the planetary gear sleeve.

[0020] Figure 3 This is an exploded view of the transmission clutch assembly, planetary gear sleeve, and differential housing in this invention.

[0021] Figure 4 for Figure 3 Exploded view of the fit between the central transmission clutch ring and the planetary gear sleeve.

[0022] Figure 5 for Figure 3 Exploded view of the fit between the central transmission clutch ring and the differential housing.

[0023] Figure 6 This is an exploded view of the differential clutch assembly, planetary gear sleeve, and differential housing in this invention.

[0024] Figure 7 for Figure 6 An exploded view of the engagement of the differential clutch ring, left half-shaft gear, and planetary gear set from a first-person perspective.

[0025] Figure 8 for Figure 6 An exploded view of the engagement of the differential clutch ring, left half-shaft gear, and planetary gear set from a second-view perspective.

[0026] Figure 9 This is a 3D view of the differential clutch ring.

[0027] Figure 10 This is a right view of the differential axial boss on the differential clutch ring.

[0028] Figure 11 is a top view of the differential axial boss on the differential clutch ring.

[0029] Figure 12 is a schematic view of the driving groove in the planetary gear sleeve.

[0030] Figure 13 is a schematic view of the driven surface on the differential axial boss under force.

[0031] Figure 14 is an exploded view of the mating of the intermediate disc and the differential housing.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] left housing 1a, right housing 1b, first through hole 1-1, second through hole 1-2, ring gear 2, planetary gear sleeve 3, spherical mounting cavity 3a, cylindrical mounting cavity 3b, driving engagement teeth 3-1, driving groove 3-2, driving surface 3-21, planetary gear 4, left half axle gear 5, differential engagement teeth 5-1, right half axle gear 6, driving electromagnetic actuator 7, driving clutch ring 8, driving connection teeth 8-1, first driving axial member 8-2, first return spring 9a, second return spring 9b, third return spring 9c, chuck 10, differential electromagnetic actuator 11, differential clutch ring 12, differential axial boss 12-1, driven surface 12-11, differential connection teeth 12-2, intermediate disc 13, second driving axial member 13-1, thrust washer 14. DETAILED DESCRIPTION

[0034] The implementation of the present application is described below by specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the specification.

[0035] Please refer to Figures 1 to 14 . It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to illustrate the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the defined conditions under which the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope of the technology disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" used in the specification are only for the convenience of clear description, and are not used to limit the scope in which the present application can be implemented, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope in which the present application can be implemented.

[0036] The differential assembly is installed on an automobile, and has a differential state, a differential locking state and a power disconnecting state, so as to avoid power reverse dragging and wheel skidding of the automobile during operation; meanwhile, the power transmission route in the differential locking state is optimized, so as to solve the defects that the planetary gear sleeve 3 and the differential clutch ring 12 are easily deformed and damaged in the differential locking state of the existing differential assembly, and the service life of the differential assembly is improved.

[0037] Referring to Figure 1 、 Figure 2 The differential assembly comprises a differential housing, an annular gear 2 for driving the differential housing to rotate, a transmission clutch assembly arranged on the right side of the differential housing and a differential clutch assembly arranged on the left side of the differential housing.

[0038] Among them,

[0039] The differential housing is composed of a left housing 1a and a right housing 1b which are detachably connected; the annular gear 2 is a split structure fixed on the right housing 1b or is integrally formed with the right housing 1b, and the annular gear 2 is used for meshing with a power gear of a gearbox, so as to transmit driving force of a power source (a motor or an engine) to the differential housing.

[0040] The differential housing is provided with a planetary gear sleeve 3, a planetary gear 4, a left half axle gear 5 and a right half axle gear 6 which are in transmission with the planetary gear 4; the planetary gear 4 is installed in the planetary gear sleeve 3 through a planetary gear shaft; specifically, the planetary gear sleeve 3 is installed in the differential housing in a circumferential rotating manner, and the planetary gear sleeve 3 has a spherical mounting cavity 3a and a cylindrical mounting cavity 3b which are communicated; the planetary gear 4 is provided with a spherical surface which is attached to the inner surface of the spherical mounting cavity 3a; since the planetary gear 4 is always in spherical surface contact with the spherical mounting cavity 3a, when the left housing 1a and the right housing 1b cooperate to limit the axial positions of the left half axle gear 5, the planetary gear 4 and the right half axle gear 6, the planetary gear sleeve 3 in spherical surface contact with the planetary gear 4 is also limited in axial position, so that the planetary gear sleeve 3 is installed in the differential housing in a circumferential rotating manner and an axial non-moving manner.

[0041] The transmission clutch assembly comprises a transmission electromagnetic actuator 7, a first reset spring 9a and a transmission clutch ring 8; the transmission clutch ring 8 is fixed in the circumferential direction of the differential housing and can move in the axial direction relative to the differential housing; when the transmission electromagnetic actuator 7 is powered, the transmission electromagnetic actuator 7 drives the transmission clutch ring 8 to move in the axial direction towards the planetary gear sleeve 3, and finally connects with the planetary gear sleeve 3 to form circumferential fixation; when the transmission electromagnetic actuator 7 is powered off, the first reset spring 9a drives the transmission clutch ring 8 to move in the axial direction away from the planetary gear sleeve 3, and finally disconnects with the planetary gear sleeve 3.

[0042] The differential clutch assembly comprises a differential electromagnetic actuator 11, a second reset spring 9b and a differential clutch ring 12; the differential clutch ring 12 is fixed in the circumferential direction of the planetary gear sleeve 3 and can move axially relative to the planetary gear sleeve 3; the second reset spring 9b is located between the differential clutch ring 12 and the left half axle gear 5; when the differential electromagnetic actuator 11 is powered on, the differential electromagnetic actuator 11 drives the differential clutch ring 12 to move axially towards the left half axle gear 5, and finally forms circumferential fixation with the left half axle gear 5; when the differential electromagnetic actuator 11 is powered off, the second reset spring 9b drives the differential clutch ring 12 to move axially away from the left half axle gear 5, and finally disconnects with the left half axle gear 5.

[0043] Since the transmission electromagnetic actuator 7 and the differential electromagnetic actuator 11 are prior art, their structures will not be described again.

[0044] Further, as shown in Figures 3 to 5 , the side of the transmission clutch ring 8 facing the transmission electromagnetic actuator 7 is provided with a first transmission axial part 8-2, and the right housing 1b is provided with a first through hole 1-1 for the first transmission axial part 8-2 to pass through, thereby enabling the transmission clutch ring 8 to be fixed in the circumferential direction on the differential housing and to move axially relative to the differential housing; the side of the transmission clutch ring 8 facing the planetary gear sleeve 3 is also provided with a transmission connecting tooth 8-1, and the side of the planetary gear sleeve 3 facing the transmission clutch ring 8 is correspondingly provided with a transmission combination tooth 3-1 that can mesh with the transmission connecting tooth 8-1, and through the meshing connection of the transmission connecting tooth 8-1 and the transmission combination tooth 3-1, the circumferential fixation of the transmission clutch ring 8 and the planetary gear sleeve 3 is achieved; in this embodiment, the transmission connecting tooth 8-1 is preferably a dog tooth, so as to reduce the loss and improve the transmission efficiency when the torque is transmitted between the planetary gear sleeve 3 and the transmission clutch ring 8.

[0045] It can be understood that there are multiple first transmission axial parts 8-2 on the transmission clutch ring 8, and the multiple first transmission axial parts 8-2 are preferably arranged at intervals in the circumferential direction of the transmission clutch ring 10; in this embodiment, the multiple first transmission axial parts 8-2 are uniformly distributed in the circumferential direction of the transmission clutch ring 10.

[0046] In a preferred embodiment, as shown in Figure 1 and Figure 3 , a chuck 10 facing the planetary gear sleeve 3 is arranged between the transmission clutch ring 8 and the transmission electromagnetic actuator 7; the chuck 10 is located outside the differential housing, and the chuck 10 is detachably fixedly connected with the first transmission axial part 8-2, so as to realize the relative fixation of the chuck 10 and the transmission clutch ring 8; the first reset spring 9a is limited between the chuck 10 and the differential housing. In this way, when the chuck 10 moves axially, it can drive the transmission clutch ring 8 to move together.

[0047] Optionally, the differential assembly further comprises a sensor for detecting the position of the chuck 10, so as to facilitate the user to accurately identify the moving position of the chuck 10.

[0048] Further, referring to Figure 1 、 Figures 6 to 8 , the outer periphery of the differential clutch ring 12 is provided with a differential axial boss 12-1, and the planetary gear sleeve 3 is provided with a driving groove 3-2 for the differential axial boss 12-1 to axially enter and exit, so that the differential clutch ring 12 and the planetary gear sleeve 3 realize circumferential linkage or circumferential linkage release; the differential clutch ring 12 is further provided with a differential connection tooth 12-2 on the side facing the left half axle gear 5, and the left half axle gear 5 is correspondingly provided with a differential combination tooth 5-1 on the side facing the differential clutch ring 12, which can be engaged with the differential connection tooth 12-2, and the engagement of the differential connection tooth 12-2 and the differential combination tooth 5-1 realizes the circumferential fixation of the differential clutch ring 12 and the left half axle gear 5; in this embodiment, the driving groove 3-2 is opened on the inner wall of the cylindrical mounting cavity 3b, so as to avoid the interference between the differential clutch ring 12 and the planetary gear 4.

[0049] It can be understood that the differential axial boss 12-1 can only axially slide in the driving groove 3-2, or the differential axial boss 12-1 can axially slide and circumferentially rotate in the driving groove 3-2, which is not limited, as long as the differential axial boss 12-1 has a driven surface 12-11 and the driving groove 3-2 has a driving surface 3-21 which is in contact with the driven surface 12-11 (as shown in Figures 10 to 12 ).

[0050] In order to ensure the stability of the combination of the differential clutch ring 12 and the left half axle gear 5, as shown in Figures 9 to 13 , the driven surface 12-11 is a bevel surface extending outward from left to right (i.e. extending away from the differential axial boss 12-1); when the driving surface 3-21 pushes the driven surface 12-11 to rotate, the pressure F of the driving surface 3-21 on the driven surface 12-11 can be decomposed into an axial pressure F1 towards the left half axle gear 5 and a tangential component F2 for rotating the differential clutch ring 12, under the action of the axial pressure F1, the differential clutch ring 12 is tightly combined with the left half axle gear 5, so as to avoid the unstable combination caused by insufficient pushing force of the differential electromagnetic actuator 11.

[0051] It should be pointed out that the outward extension angle of the driven surface 12-11 can be determined according to actual conditions, which is not limited, and in this embodiment, the outward inclination angle of the driven surface 12-11 is preferably 3°~5°.

[0052] It can be understood that the differential shaft axial boss 12-1 is multiple, and the multiple differential shaft axial bosses 12-1 are preferably arranged at intervals along the circumference of the differential clutch ring 12; in the embodiment, the multiple differential shaft axial bosses 12-1 are uniformly distributed along the outer circumference of the differential clutch ring 12.

[0053] In a preferred embodiment, the differential connection tooth 12-2 is a dog tooth, so as to reduce the loss when the torque is transmitted between the planetary gear set 3 and the differential clutch ring 12, and improve the transmission efficiency.

[0054] Further, as shown in Figure 1 、 Figure 6 and Figure 14 , the differential electromagnetic actuator 11 and the differential clutch ring 12 are provided with an intermediate disc 13, and the intermediate disc 13 is located outside the differential housing; the side of the intermediate disc 13 facing the differential clutch ring 12 is provided with a second transmission axial part 13-1, and the differential housing is provided with a second through hole 1-2 for the second transmission axial part 13-1 to pass through, so that the intermediate disc 13 is circumferentially fixed on the differential housing and axially moves relative to the differential housing; the intermediate disc 13 and the differential housing are selectively provided with a third return spring 9c; since the intermediate disc 13 and the differential clutch ring 12 do not have power transmission in the circumferential direction, when the differential electromagnetic actuator 11 pushes the differential clutch ring 12 to move axially towards the left half shaft gear 5 through the intermediate disc 13, the intermediate disc 13 and the differential clutch ring 12 can rotate respectively and do not interfere with each other.

[0055] Further, as shown in Figure 1 , the differential electromagnetic actuator 11 and the intermediate disc 13 are provided with a thrust washer 14, and the transmission electromagnetic actuator 7 and the chuck 10 are provided with a thrust washer 14, so as to transmit the thrust of the electromagnetic actuator by using the thrust washer 14; the thrust washer 14 is preferably made of friction material.

[0056] Optionally, the differential assembly further comprises a sensor for detecting the position of the intermediate disc 13, so as to facilitate the user to accurately identify the moving position of the intermediate disc 13.

[0057] The application also provides a vehicle comprising the differential assembly.

[0058] In actual driving process, the user can control the state of transmission electromagnetic actuator 7 and differential electromagnetic actuator 11 according to the needs, so that the differential assembly is switched between the differential state, power off state and differential lock state. When the transmission electromagnetic actuator 7 is powered on, and the differential electromagnetic actuator 11 is powered off, the powered transmission electromagnetic actuator 7 drives the transmission clutch ring 10 to approach the planetary gear sleeve 3, until the transmission connection tooth 8-1 of the transmission clutch ring 10 and the transmission combination tooth 3-1 of the planetary gear sleeve 3 are connected to form circumferential fixation, in the process, the first reset spring 9a is gradually compressed; when the transmission clutch ring 10 and the planetary gear sleeve 3 are circumferentially fixed, because the transmission clutch ring 10 itself and the differential housing are circumferentially fixed, the differential housing and the planetary gear sleeve 3 are in power connection state; At this time, the differential assembly is in differential state, which can automatically adjust the rotation speed of the left and right wheels of the automobile during steering, and ensure the stability of the automobile steering;

[0059] When the transmission electromagnetic actuator 7 is powered off, and the differential electromagnetic actuator 11 is powered off, the compressed first reset spring 9a will push the transmission clutch ring 10 to move axially away from the planetary gear sleeve 3, until the transmission connection tooth 8-1 of the transmission clutch ring 10 and the transmission combination tooth 3-1 of the planetary gear sleeve 3 are separated, at this time, the differential assembly is in power off state, there is no power transmission between the differential housing and each half shaft gear, which avoids the power transmission of wheel rotation to the differential housing, and causes the problem of power reverse dragging.

[0060] When the transmission electromagnetic actuator 7 is energized and the differential electromagnetic actuator 11 is energized, the energized transmission electromagnetic actuator 7 drives the transmission clutch ring 10 to approach the planetary gear sleeve 3 until the transmission connecting teeth 8-1 of the transmission clutch ring 10 and the transmission combination teeth 3-1 of the planetary gear sleeve 3 are connected to form circumferential fixation; at the same time, the energized differential transmission electromagnetic actuator 11 pushes the differential clutch ring 12 to approach the left half axle gear 5 through the intermediate disc 13 until the differential connecting teeth 12-2 of the differential clutch ring 12 and the differential combination teeth 5-1 of the left half axle gear 5 are connected to form circumferential fixation; in this way, the power of the power source can be transmitted to the planetary gear sleeve 3 through the differential housing, and transmitted to the differential clutch ring 12 through the planetary gear sleeve 3, and then transmitted to the left half axle gear 5, at this time, the differential assembly is in a differential lock state, in this state, the differential housing, the planetary gear sleeve 3, the planetary gear 4 and each half axle gear rotate synchronously, so that the differential adjustment of the two side wheels is limited, effectively solving the problem of wheel slip of the vehicle when driving on bad roads, and improving the vehicle escape ability; in addition, in the differential lock state, the power transmission route of the entire differential assembly is optimized, the original double route power transmission (i.e. differential housing → planetary gear sleeve 3 → planetary gear 4 → left half axle gear 5 → differential clutch ring 12 and differential housing → differential clutch ring 12 → left half axle gear 5) is optimized to single route power transmission (i.e. differential housing → planetary gear sleeve 3 → differential clutch ring 12 → left half axle gear 5), avoiding torsional deformation of the planetary gear sleeve 3 and the differential clutch ring 12 due to uneven stress, and improving the service life of the planetary gear sleeve 3 and the differential clutch ring 12.

[0061] In summary, the differential transmission assembly is optimized to optimize the power transmission route of the differential assembly in the differential lock state, ensure that the power of the differential housing can only be transmitted to the left half axle gear 5 through the planetary gear sleeve 3 and the differential clutch ring 12, avoid torsional deformation of the planetary gear sleeve 3 and the differential clutch ring 12 due to uneven stress in the differential lock state, and improve the service life of the planetary gear sleeve 3 and the differential clutch ring 12.

[0062] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A differential assembly, comprising a differential housing, a ring gear (2) driving the differential housing to rotate, a transmission clutch assembly arranged on the right side of the differential housing, and a differential clutch assembly arranged on the left side of the differential housing; the differential housing is provided with a planetary gear sleeve (3), a planetary gear (4), a left half axle gear (5) and a right half axle gear (6) in meshing transmission with the planetary gear (4); the planetary gear (4) is installed in the planetary gear sleeve (3) through a planetary gear shaft; the transmission clutch assembly comprises a transmission electromagnetic actuator (7), a first reset spring (9a) and a transmission clutch ring (8); the transmission clutch ring (8) is circumferentially fixed with the differential housing and can move axially relative to the differential housing; when the transmission electromagnetic actuator (7) is energized, the transmission clutch ring (8) is driven to move axially towards the direction of the planetary gear sleeve (3) and finally connected with the planetary gear sleeve (3) to form circumferential fixation; when the transmission electromagnetic actuator (7) is de-energized, the first reset spring (9a) drives the transmission clutch ring (8) to move axially away from the direction of the planetary gear sleeve (3) and finally disconnected with the planetary gear sleeve (3); the differential clutch assembly comprises a differential electromagnetic actuator (11), a second reset spring (9b) and a differential clutch ring (12); characterized in that, The differential clutch ring (12) is circumferentially fixed with the planetary gear cover (3) and can move axially relative to the planetary gear cover (3); the second reset spring (9b) is located between the differential clutch ring (12) and the left half axle gear (5); when the differential electromagnetic actuator (11) is energized, the differential electromagnetic actuator (11) drives the differential clutch ring (12) to move axially in the direction close to the left half axle gear (5), and finally forms circumferential fixation with the left half axle gear (5); when the differential electromagnetic actuator (11) is de-energized, the second reset spring (9b) drives the differential clutch ring (12) to move axially in the direction away from the left half axle gear (5), and finally disconnects with the left half axle gear (5).

2. A differential assembly as in claim 1, wherein, The intermediate disc (13) is provided between the differential electromagnetic actuator (11) and the differential clutch ring (12), and the intermediate disc (13) is located outside the differential housing; at least one second transmission axial part (13-1) is provided on the side of the intermediate disc (13) facing the differential clutch ring (12), and a second through hole (1-2) is provided on the differential housing for the second transmission axial part (13-1) to pass through; the differential electromagnetic actuator (11) drives the differential clutch ring (12) to move axially in the direction close to the left half axle gear (5) through the intermediate disc (13).

3. A differential assembly as in claim 2, wherein, At least one differential axial boss (12-1) is provided on the outer periphery of the differential clutch ring (12), and a driving groove (3-2) is provided in the planetary gear cover (3) for the differential axial boss (12-1) to enter and exit; when the differential axial boss (12-1) enters the driving groove (3-2), the driving groove (3-2) drives the differential clutch ring (12) to rotate through the differential axial boss (12-1); differential connection teeth (12-2) are provided on the side of the differential clutch ring (12) facing the left half axle gear (5), and differential combination teeth (5-1) are provided on the left half axle gear (5) to cooperate with the differential connection teeth (12-2).

4. A differential assembly as in claim 3, wherein, The differential connection teeth (12-2) are dog teeth.

5. A differential assembly as in claim 3, wherein, The differential axial boss (12-1) has a driven surface (12-11), and the driving groove (3-2) has a driving surface (3-21) abutting the driven surface (12-11); when the driving surface (3-21) pushes the driven surface (12-11) to rotate, the differential clutch ring (12) moves axially in the direction close to the left half axle gear (5).

6. A differential assembly as in claim 5, wherein, The driven surface (12-11) is a left-to-right outwardly extending inclined surface, and the outward inclination angle of the driven surface (12-11) is 3°-5°.

7. A differential assembly as in claim 6, wherein The transmission clutch ring (8) is provided with transmission connection teeth (8-1) on the side close to the planetary gear cover (3), and the planetary gear cover (3) is provided with transmission combination teeth (3-1) on the side close to the transmission clutch ring (8) to mesh with the transmission connection teeth (8-1).

8. A differential assembly as in claim 7, wherein, The transmission clutch ring (8) is provided with at least one first transmission axial part (8-2) on the side close to the transmission electromagnetic actuator (7), and the differential housing is provided with a first through hole (1-1) for the first transmission axial part (8-2) to pass through.

9. A differential assembly as in claim 8, wherein, The transmission clutch ring (8) is provided with a chuck (10) towards the planetary gear cover (3) between the transmission electromagnetic actuator (7); the chuck (10) is located outside the differential housing, and the chuck (10) and the first transmission shaft (8-2) are detachably fixedly connected; the first reset spring (9a) is limited between the chuck (10) and the differential housing.

10. A vehicle characterized by comprising: The differential assembly comprises the differential assembly as claimed in any one of claims 1 to 9.

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