阅读说明：本技术 一种一体式适时四驱差速器总成 (Integrated timely four-wheel drive differential assembly ) 是由 张宇荣 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种一体式适时四驱差速器总成,属于机械传动技术领域,其包括包括外壳体、内壳体、差速器组件,外壳体与车辆动力源传动联接,内壳体可转动地承设于外壳体中,差速器组件设于内壳体中；外壳体与内壳体之间设有驱动摩擦副,驱动摩擦副的主、从动驱动摩擦片分别与外壳体、内壳体联动；驱动摩擦副的一侧设有用于压紧主、从动驱动摩擦片的推力结构；内壳体的一侧敞开,敞开的该侧端部抵接在外壳体同侧端的内端面上,从而包围形成用于容纳差速器组件的容纳腔。本发明不需要中央差速器或分动箱便能实现四驱车辆被动桥的动力供给与分离,不仅成本低,体积小重量轻,操作简单,而且四驱模式下被动桥的左、右轮依然能实现差速。(The invention discloses an integrated timely four-wheel drive differential assembly, which belongs to the technical field of mechanical transmission and comprises an outer shell, an inner shell and a differential assembly, wherein the outer shell is in transmission connection with a vehicle power source, the inner shell is rotatably arranged in the outer shell, and the differential assembly is arranged in the inner shell; a driving friction pair is arranged between the outer shell and the inner shell, and a driving friction plate and a driven friction plate of the driving friction pair are respectively linked with the outer shell and the inner shell; one side of the driving friction pair is provided with a thrust structure for pressing the driving friction plate and the driven friction plate; one side of the inner housing is open, and the open side end abuts on an inner end face of the same side end of the outer housing, thereby enclosing a receiving cavity for receiving the differential assembly. The invention can realize the power supply and separation of the driven axle of the four-wheel drive vehicle without a central differential or a transfer case, has low cost, small volume, light weight and simple operation, and can still realize the differential speed of the left wheel and the right wheel of the driven axle in the four-wheel drive mode.)

1. The utility model provides an in good time four-wheel drive differential assembly of integral type, is including locating the differential mechanism casing in the vehicle reduction box, locating the differential mechanism subassembly in the differential mechanism casing, left and right semi-axis, its characterized in that are connected to the differential mechanism subassembly: the differential mechanism shell comprises an outer shell and an inner shell, the outer shell is in transmission connection with a vehicle power source, the inner shell is rotatably arranged in the outer shell, and the differential mechanism assembly is arranged in the inner shell; the outer wall of the inner shell is provided with a section of external spline, the corresponding position on the inner wall of the outer shell is provided with a section of internal spline, a driving friction pair is arranged between the outer shell and the inner shell and comprises a plurality of driving friction plates and driven friction plates which are arranged at intervals, the external teeth of the driving friction plates are meshed with the internal spline of the outer shell to realize linkage, and the internal teeth of the driven limited slip friction plates are meshed with the external spline of the inner shell to realize linkage; one side of the driving friction pair is provided with a thrust structure for pressing the driving friction plate and the driven friction plate; the inner housing is open on one side and the open side end abuts against the inner end face of the outer housing on the same side end, thereby enclosing a receiving cavity for receiving the differential assembly.

2. The integrated right-in-time four-wheel drive differential assembly according to claim 1, wherein: the inner shell comprises an inner shell body and a transmission sleeve part integrally connected to the left side of the inner shell body, the right side end of the inner shell body is abutted against the outer shell body, the transmission sleeve part is coaxial with a left half shaft and a right half shaft, and the left half shaft and the right half shaft respectively extend into a right shaft hole of the transmission sleeve part and the outer shell body to be connected with the differential mechanism assembly; the outer wall of interior casing body and the inner wall clearance fit of shell body, on the outer wall of transmission cover portion was located to the external spline of interior casing, the vice shell body of locating of drive friction and transmission cover portion between, the vice left side of drive friction meets with thrust mechanism, and the right side meets with the outer terminal surface in the left side of interior casing body.

3. An integrated right-in-time four-wheel drive differential assembly according to claim 2, wherein: the thrust structure comprises a four-wheel drive actuator, a front guide friction pair and a front guide actuating assembly which are sequentially arranged on the left side of the drive friction pair;

the four-wheel drive actuator is a relative rotation actuator and comprises a first pressing ring, a first control ring and a plurality of rolling parts which are arranged between the first pressing ring and the first control ring along the circumference, the first pressing ring is sleeved on the transmission sleeve part through an internal spline and is adjacent to the driving friction pair, the first control ring is sleeved on the transmission sleeve part and can rotate relative to the transmission sleeve part and the outer shell, and the outer circumferential surface of the first control ring is provided with an external spline; a plurality of circular arc-shaped raceway grooves distributed along the circumference are formed in the opposite end faces of the first pressure ring and the first control ring, the depth of each raceway groove is gradually reduced from the middle to the two ends, each rolling part is clamped between one raceway groove of the first pressure ring and one raceway groove of the first control ring, and the first control ring rotates relative to the first pressure ring to enable the first pressure ring to generate axial displacement;

the front guide friction pair is coaxially sleeved between the first control ring and the outer shell and comprises a plurality of driving front guide friction plates and driven front guide friction plates which are arranged at intervals, the outer teeth of the driving front guide friction plates are meshed with the inner splines of the outer shell, and the inner teeth of the driven front guide friction plates are meshed with the outer splines of the first control ring;

the leading actuating assembly is used for driving the driving and driven leading friction plates of the leading friction pair to be mutually compressed, so that the first control ring of the four-wheel drive actuator rotates relative to the first pressing ring to generate axial rightward thrust on the first pressing ring, and the driving and driven friction plates of the driving friction pair are compressed.

4. An integrated right-in-time four-wheel drive differential assembly according to claim 3, wherein: the leading actuating component is an electromagnetic actuating mechanism and comprises a solenoid coil fixedly arranged in a reduction gearbox of the vehicle, and the main and driven leading friction plates of the leading friction pair can be pressed mutually by electrifying the solenoid coil.

5. An integrated right-in-time four-wheel drive differential assembly according to claim 4, wherein: the electromagnetic actuating mechanism also comprises an electromagnet outer shell and an electromagnet inner frame which are combined to form an annular cavity, and the solenoid coil is arranged in the annular cavity; the electromagnetic shell is fixedly connected to the left end of the outer shell and synchronously rotates with the outer shell, the electromagnet inner frame is fixedly installed in a vehicle reduction box, the solenoid coil is fixed on the electromagnet inner frame, and the electromagnet shell and the electromagnet inner frame can rotate relatively.

6. An integrated right-in-time four-wheel drive differential assembly according to claim 5, wherein: the left end of the outer shell is provided with a shell shaft sleeve, the electromagnet shell is sleeved outside the shell shaft sleeve and is fixedly connected with the shell shaft sleeve, and a bearing is arranged between the electromagnet inner frame and the shell shaft sleeve, so that the electromagnet shell and the electromagnet inner frame can rotate relatively; the left end of the inner shell transmission sleeve part is rotatably supported in the outer shell shaft sleeve, and a plane bearing is arranged between the left end face of the first control ring of the four-wheel drive actuator and the right end face of the outer shell shaft sleeve.

7. An integrated right-in-time four-wheel drive differential assembly according to claim 6, wherein: the right end of the shell shaft sleeve is provided with a stepped hole with the diameter larger than that of the shaft hole, the left end of the transmission sleeve part is embedded in the stepped hole, the left end face of the transmission sleeve part abuts against the bottom face of the stepped hole, and the outer peripheral face of the left end of the transmission sleeve part is in clearance fit with the inner peripheral face of the stepped hole.

8. An integrated, right-of-time four-wheel drive differential assembly according to claim 1, 2, 3, 4, 5, 6 or 7, wherein: the differential mechanism assembly is a planetary gear type differential mechanism, a friction plate type differential mechanism, a Torsen differential mechanism, an overrunning differential mechanism, a jaw differential mechanism, or a planetary gear type differential mechanism and a friction plate type differential mechanism with differential locks.

Technical Field

The invention relates to the technical field of mechanical transmission, in particular to an integrated timely four-wheel drive differential assembly.

Background

The common passenger vehicle is generally a two-wheel drive vehicle, but in the actual driving process, some driving road conditions need four-wheel drive, for example, when the vehicle runs on wet and icy roads and uneven roads or wheels fall into mud pits to slip or climb a slope, the vehicle needs larger driving force, and the front wheel and the rear wheel both need power drive to improve the passing performance of the vehicle. The four-wheel drive vehicle generally needs a central differential or a transfer case to realize the power supply and separation of a driven axle, but the central differential has a complex structure and high cost and has higher failure rate, while the transfer case has a simple and reliable structure and low cost, but the time-sharing four-wheel drive vehicle provided with the transfer case needs manual operation for parking when the driving mode is switched every time, and the operation is more complicated.

The applicant invents an electromagnetic friction plate driving timely four-wheel drive reducer, and the invention creates a practical novel patent application to the Chinese patent office in 2019, 4, 30, the reducer is installed in a driven axle of a four-wheel drive vehicle, and comprises an output shell, a left half shaft sleeve, a right half shaft sleeve and a left driving friction pair and a right driving friction pair, wherein the left half shaft sleeve and the right half shaft sleeve are coaxially sleeved in the output shell, the left driving friction pair and the right driving friction pair are coaxially connected with a vehicle power source in a transmission way, the left half shaft sleeve and the right half shaft sleeve are coaxially butted and mutually and freely rotate, driving friction plates of the left driving friction pair and the right driving friction pair are all linked with the output shell, driven friction plates are respectively linked with the left half shaft sleeve and the right half shaft sleeve, an annular isolating pad capable of axially sliding is arranged between the left driving friction pair and the right driving friction pair, a thrust structure for pressing a driving friction plate and a driven friction plate of the left driving friction pair is, and then the driving friction plate and the driven friction plate of the right driving friction pair are linked to be mutually compressed, so that the left half shaft sleeve and the right half shaft sleeve are simultaneously connected and locked with the output shell and synchronously rotate with the output shell to realize four-wheel drive. Although the structure does not need a central differential or a transfer case to realize the power supply and separation of the driven axle and does not need the parking operation, the structure is simple, the cost is low, and the operation is simple, when the four-wheel drive mode is switched, the left half shaft and the right half shaft of the driven axle are simultaneously connected and locked with the output shell, the differential speed cannot be realized, and the wheels slide in the driving process of the vehicle, thereby aggravating the tire wear, and increasing the power and the fuel consumption.

Disclosure of Invention

The invention aims to solve the technical problem and provides an integrated timely four-wheel drive differential assembly which is arranged in a reduction gearbox of a driven axle of a four-wheel drive vehicle, does not need a central differential or a transfer case to realize the power supply and separation of the driven axle, has simple and reliable structure, small volume, light weight, low cost, simple operation and quick response, and can still realize the differential of the left wheel and the right wheel of the driven axle in a four-wheel drive mode.

The technical scheme of the invention is as follows:

the utility model provides an in good time four-wheel drive differential assembly of integral type, is including locating the differential mechanism casing in the vehicle reduction box, locating the differential mechanism subassembly in the differential mechanism casing, left and right semi-axis, its characterized in that are connected to the differential mechanism subassembly: the differential mechanism shell comprises an outer shell and an inner shell, the outer shell is in transmission connection with a vehicle power source, the inner shell is rotatably arranged in the outer shell, and the differential mechanism assembly is arranged in the inner shell; the outer wall of the inner shell is provided with a section of external spline, the corresponding position on the inner wall of the outer shell is provided with a section of internal spline, a driving friction pair is arranged between the outer shell and the inner shell and comprises a plurality of driving friction plates and driven friction plates which are arranged at intervals, the external teeth of the driving friction plates are meshed with the internal spline of the outer shell to realize linkage, and the internal teeth of the driven limited slip friction plates are meshed with the external spline of the inner shell to realize linkage; one side of the driving friction pair is provided with a thrust structure for pressing the driving friction plate and the driven friction plate; the inner housing is open on one side and the open side end abuts against the inner end face of the outer housing on the same side end, thereby enclosing a receiving cavity for receiving the differential assembly. The outer shell and the inner shell are connected into a whole in a locking manner by compressing the driving friction plate and the driven friction plate, so that the power supply of a driven axle is realized, the structure is simple and reliable, and the cost is low. Meanwhile, the accommodating cavity is formed by surrounding the inner shell and the outer shell, so that the structure of a shell cover of the inner shell is omitted, and parts are reduced, thereby reducing the volume and the weight of the differential, further reducing the manufacturing cost and simplifying the assembly steps.

In the integrated timely four-wheel drive differential assembly, the inner shell comprises an inner shell body and a transmission sleeve part integrally connected to the left side of the inner shell body, the right side end of the inner shell body is abutted against the outer shell body, the transmission sleeve part is coaxial with the left half shaft and the right half shaft, and the left half shaft and the right half shaft respectively extend into a right shaft hole of the transmission sleeve part and the outer shell body to be connected with the differential assembly; the outer wall of interior casing body and the inner wall clearance fit of shell body, on the outer wall of transmission cover portion was located to the external spline of interior casing, the vice shell body of locating of drive friction and transmission cover portion between, the vice left side of drive friction meets with thrust mechanism, and the right side meets with the outer terminal surface in the left side of interior casing body. At the fixed condition of differential mechanism subassembly structure size rationally distributed, will drive friction pair and locate between shell body and the transmission portion cover, and the inner wall of shell body and the outer wall laminating of interior casing body, the radial dimension of reduction shell body that can the at utmost to the at utmost reduces whole differential mechanism's volume and weight.

In the integrated timely four-wheel drive differential assembly, the thrust structure comprises a four-wheel drive actuator, a front guide friction pair and a front guide actuating assembly which are sequentially arranged on the left side of the drive friction pair; the four-wheel drive actuator is a relative rotation actuator and comprises a first pressing ring, a first control ring and a plurality of rolling parts which are arranged between the first pressing ring and the first control ring along the circumference, the first pressing ring is sleeved on the transmission sleeve part through an internal spline and is adjacent to the driving friction pair, the first control ring is sleeved on the transmission sleeve part and can rotate relative to the transmission sleeve part and the outer shell, and the outer circumferential surface of the first control ring is provided with an external spline; a plurality of circular arc-shaped raceway grooves distributed along the circumference are formed in the opposite end faces of the first pressure ring and the first control ring, the depth of each raceway groove is gradually reduced from the middle to the two ends, each rolling part is clamped between one raceway groove of the first pressure ring and one raceway groove of the first control ring, and the first control ring rotates relative to the first pressure ring to enable the first pressure ring to generate axial displacement; the front guide friction pair is coaxially sleeved between the first control ring and the outer shell and comprises a plurality of driving front guide friction plates and driven front guide friction plates which are arranged at intervals, the outer teeth of the driving front guide friction plates are meshed with the inner splines of the outer shell, and the inner teeth of the driven front guide friction plates are meshed with the outer splines of the first control ring; the leading actuating assembly is used for driving the driving and driven leading friction plates of the leading friction pair to be mutually compressed, so that the first control ring of the four-wheel drive actuator rotates relative to the first pressing ring to generate axial rightward thrust on the first pressing ring, and the driving and driven friction plates of the driving friction pair are compressed.

In the integrated timely four-wheel drive differential assembly, the leading actuating component is an electromagnetic actuating mechanism and comprises a solenoid coil fixedly arranged in a reduction gearbox of the vehicle, and the driving and driven leading friction plates of the leading friction pair can be pressed mutually by electrifying the solenoid coil.

In the integrated timely four-wheel drive differential assembly, the electromagnetic actuating mechanism further comprises an electromagnet outer shell and an electromagnet inner frame which are combined to form an annular cavity, and the solenoid coil is arranged in the annular cavity; the electromagnetic shell is fixedly connected to the left end of the outer shell and synchronously rotates with the outer shell, the electromagnet inner frame is fixedly installed in a vehicle reduction box, the solenoid coil is fixed on the electromagnet inner frame, and the electromagnet shell and the electromagnet inner frame can rotate relatively.

In the integrated timely four-wheel drive differential assembly, a shell shaft sleeve is arranged at the left end of the shell, the electromagnet shell is sleeved outside the shell shaft sleeve and is fixedly connected with the shell shaft sleeve, and a bearing is arranged between the electromagnet inner frame and the shell shaft sleeve, so that the electromagnet shell and the electromagnet inner frame can rotate relatively; the left end of the inner shell transmission sleeve part is rotatably supported in the outer shell shaft sleeve, and a plane bearing is arranged between the left end face of the first control ring of the four-wheel drive actuator and the right end face of the outer shell shaft sleeve.

In the integrated timely four-wheel drive differential assembly, the right end of the shell shaft sleeve is provided with a stepped hole with the diameter larger than that of the shaft hole, the left end of the transmission sleeve part is embedded in the stepped hole, the left end face of the transmission sleeve part abuts against the bottom face of the stepped hole, and the outer peripheral face of the left end of the transmission sleeve part is in clearance fit with the inner peripheral face of the stepped hole. Both ends of the inner shell are rotatably supported in the outer shell through clearance fit, so that a bearing is omitted, parts are reduced, the size and the weight of the differential are further reduced, the manufacturing cost is reduced, and the assembly steps are simplified.

In the integrated timely four-wheel drive differential assembly, the differential assembly is a planetary gear type differential, a friction plate type differential, a Torsen differential, an overrunning differential, a jaw type differential, or a planetary gear type differential and a friction plate type differential with differential locks.

The invention has the beneficial effects that:

1. the power supply and separation of the driven axle are realized without a central differential or a transfer case, the structure is simple and reliable, the manufacturing cost is low, and the power supply and separation device is suitable for timely four-wheel drive vehicles;

2. the inner shell and the outer shell are used for surrounding to form an accommodating cavity of the differential assembly, the structures and the position relations of the inner shell, the outer shell and the driving friction pair are reasonably configured, a bearing between the inner shell and the outer shell is removed, the size and the weight of the whole differential are reduced to the greatest extent, and the miniaturization and the light weight of automobile parts are promoted;

3. the inner shell and the outer shell of the differential are connected and locked by extruding a plurality of friction plates to generate friction force, so that the flexible transmission of power is realized, a two-wheel drive mode or a four-wheel drive mode can be switched during the traveling of a vehicle, the vehicle does not need to be stopped and switched, the switching is free from pause and frustration, and the driving experience is improved;

4. the coupling locking of the inner shell and the outer shell of the differential is realized through two-stage transmission force application of a front guide actuating assembly, a front guide friction pair, a four-wheel drive actuator and a driving friction pair, so that larger locking force is obtained with lower power consumption required for controlling the front guide actuating assembly, the response speed is high, the performance is stable and reliable, and the difficulty-escaping capability of a vehicle is effectively improved;

5. the electric four-wheel-drive hybrid electric vehicle has a wide application range, can be adapted to a driven axle of a four-wheel-drive vehicle, for example, can be applied to a front axle of an all-terrain vehicle or an electric front-drive car to decelerate after increasing to form a timely four-wheel-drive vehicle type, and is suitable for various manual-gear vehicles, automatic-gear vehicles and new-energy electric vehicles; meanwhile, the differential assembly can be selected to be of a proper type according to actual conditions.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a ball ramp actuator in an embodiment of the present invention.

Detailed Description

The invention will now be further described with reference to the accompanying drawings and examples:

in the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the terms "left", "right", and the like are based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to the attached drawing 1, the integrated timely four-wheel drive differential assembly provided by the embodiment is installed in a reduction gearbox of a driven axle of a four-wheel drive vehicle, and comprises a differential shell and a differential assembly arranged in the differential shell, wherein the differential shell is arranged in the reduction gearbox of the driven axle, and the differential assembly is connected with a left half shaft and a right half shaft of the driven axle. The differential mechanism shell comprises an outer shell 1 and an inner shell, the outer shell 1 is rotatably arranged in the reduction gearbox and is in transmission connection with a power source of a vehicle, the inner shell is rotatably arranged in the outer shell 1, and the differential mechanism assembly is arranged in the inner shell. Be equipped with one section external splines on the outer wall of interior casing, relevant position on the 1 inner wall of shell body is equipped with one section internal splines, be equipped with the vice 3 of drive friction between shell body 1 and the interior casing, the vice 3 of drive friction includes a plurality of interval arrangement's initiative drive friction disc and driven drive friction disc, the external tooth of initiative drive friction disc realizes the linkage with the internal splines meshing of shell body 1, the internal tooth of driven limit slip friction disc realizes the linkage with the external splines meshing of interior casing. One side of the driving friction pair 3 is provided with a thrust structure for compressing the driving friction plate and the driven friction plate, and the compression between the driving friction plate and the driven friction plate causes the outer shell 1 and the inner shell to be locked and connected into a whole, so that the power supply of a driven axle is realized.

Specifically, the right side of the inner case is open, and the open side end portion abuts on an inner end face of the right side end of the outer case 1, thereby enclosing a housing chamber for housing the differential assembly. The inner shell comprises an inner shell body 21 and a transmission sleeve part 22 integrally connected to the left side of the inner shell body 21, the right side end of the inner shell body 21 is abutted to the outer shell 1, the transmission sleeve part 22 is coaxial with the left half shaft and the right half shaft, and the left half shaft and the right half shaft respectively extend into a right shaft hole of the transmission sleeve part 22 and the outer shell 1 to be connected with the differential assembly. The outer wall of interior casing body 21 and the inner wall clearance fit of shell body 1, the outer spline of interior casing is located on the outer wall of transmission cover portion 22, and the vice 3 of drive friction is located between shell body 1 and transmission cover portion 22, and the left side of the vice 3 of drive friction meets with thrust mechanism, and the right side meets with the outer terminal surface in left side of interior casing body 21.

Specifically, the thrust structure comprises a four-wheel drive actuator, a front guide friction pair 5 and a front guide actuating assembly which are sequentially arranged on the left side of the drive friction pair 3; the four-wheel drive actuator is a relative rotation actuator, in this embodiment, a ball ramp type actuator, and includes a first press ring 41, a first control ring 42, and a plurality of rolling members 43 arranged between the first press ring and the first control ring along the circumference, in this embodiment, the rolling members 43 are balls, the first press ring 41 is sleeved on the transmission sleeve portion 22 through an internal spline and adjacent to the driving friction pair 3, the first control ring 42 is sleeved on the transmission sleeve portion 33, and can rotate relative to the transmission sleeve portion 33 and the outer shell 1, and the outer circumferential surface thereof is provided with an external spline; referring to fig. 2, a plurality of circular arc-shaped track grooves 44 are formed in the opposite end surfaces of the first pressing ring 41 and the first control ring 42, the depth of each track groove 44 gradually decreases from the middle to the two ends, each ball is sandwiched between one track groove 44 of the first pressing ring 41 and one track groove 44 of the first control ring 42, and the first control ring 42 rotates relative to the first pressing ring 41 to enable the first pressing ring 41 to generate axial displacement. The front guiding friction pair 5 is coaxially sleeved between the first control ring 42 and the outer shell 1 and comprises a plurality of driving front guiding friction plates and driven front guiding friction plates which are arranged at intervals, outer teeth of the driving front guiding friction plates are meshed with inner splines of the outer shell 1, and inner teeth of the driven front guiding friction plates are meshed with outer splines of the first control ring 42. The leading actuating assembly is used for driving the driving and driven leading friction plates of the leading friction pair 5 to be pressed against each other, so that the first control ring of the four-wheel drive actuator rotates relative to the first pressing ring 41 to generate axial rightward thrust on the first pressing ring 41, and the driving and driven friction plates of the driving friction pair 3 are pressed.

The leading actuating component is an electromagnetic actuating mechanism and comprises an electromagnet outer shell 61, an electromagnet inner frame 62 and a solenoid coil 63, the electromagnet outer shell 61 and the electromagnet inner frame 62 are combined to form an annular cavity, the solenoid coil 63 is arranged in the annular cavity, a lead wire 64 extends into the annular cavity to be electrically connected with the solenoid coil 63, and the driving and driven leading friction plates of the leading friction pair 5 can be pressed mutually by electrifying the solenoid coil 63. The electromagnet shell 61 is fixedly connected to the left end of the outer shell 1 and rotates synchronously with the outer shell 1, the electromagnet shell 1 is adjacent to the front guiding friction pair 5, the electromagnet inner frame 62 is fixedly installed in a vehicle reduction box, the solenoid coil 63 is fixed on the electromagnet inner frame 62, and the electromagnet shell 61 and the electromagnet inner frame 62 can rotate relatively.

Specifically, the electromagnet housing 61 is an annular housing having an annular accommodating groove with an opening facing to the left, the electromagnet inner frame 62 is an annular bracket including an annular frame portion extending into the annular accommodating groove and an annular cover portion covering the notch of the annular accommodating groove, and the solenoid coil 63 is fixedly sleeved on the annular frame portion of the electromagnet inner frame 62.

In addition, the left end of the outer shell 1 is further provided with an outer shell shaft sleeve 11, the electromagnet outer shell 61 is sleeved outside the outer shell shaft sleeve 11 and fixedly connected with the outer shell shaft sleeve 11, a bearing 65 is arranged between the electromagnet inner frame 62 and the outer shell shaft sleeve 11, so that the electromagnet outer shell 61 and the electromagnet inner frame 62 can rotate relatively, the left end of the inner shell transmission sleeve part 22 can be rotatably supported in the outer shell shaft sleeve 11, and a plane bearing 45 is arranged between the left end face of the first control ring 42 of the four-wheel drive actuator and the right end face of the outer shell shaft sleeve 11. Specifically, the right end of the housing sleeve 11 has a stepped hole with a diameter larger than the shaft hole, the left end of the transmission sleeve 22 is embedded in the stepped hole, the left end face abuts against the bottom surface of the stepped hole, and the outer peripheral surface of the left end of the transmission sleeve 22 is in clearance fit with the inner peripheral surface of the stepped hole, so that rotatable bearing is realized.

The differential assembly may be a planetary gear differential, a friction plate differential, a townsend differential, an overrunning differential, a jaw differential, or various differentials such as a planetary gear differential with differential lock, a friction plate differential, etc., in this embodiment, the differential assembly is a common planetary gear differential, and includes left and right axle gears 71, 72 disposed in the inner housing, and a planetary gear 73 engaged with the left and right axle gears 71, 72, the left and right axle gears 71, 72 are respectively connected to the left and right axle shafts in a transmission manner.

It is also within the scope of the present invention to mirror the entire structure of the present embodiment from the left to the right.

The working principle of the embodiment is as follows:

the differential assembly of the embodiment is arranged between driven axles of timely four-wheel drive vehicles and arranged in a reduction gearbox of the driven axles, when a computer judges that the vehicles do not need four-wheel drive intervention, the solenoid coil 63 is not electrified, the outer shell 1 of the differential is not connected with the inner shell, the left half shaft and the right half shaft of the driven axles are not driven and are in free differential, and the vehicles are in a two-wheel drive state. When a computer judges that the vehicle needs four-wheel drive intervention, the electromagnetic actuating mechanism is automatically started, the solenoid coil 63 is electrified, the driving and driven front guide friction plates of the front guide friction pair 5 are attracted to enable the driving and driven front guide friction plates to be mutually compressed, so that the first control ring 42 of the four-wheel drive actuator and the outer shell 1 rotate synchronously and generate relative rotation with the first pressing ring 41, balls are forced to move to a shallow position along the raceway groove 44 to push and press the first pressing ring, the first pressing ring 41 moves to the right in the axial direction to compress the driving and driven limited slip friction plates of the driving friction pair 3, the outer shell 1 and the inner shell are locked and connected into a whole, the inner shell and the outer shell 1 rotate synchronously under the driving of a vehicle power source, and therefore the power supply of a driven axle reaches four-wheel drive, and the left and right half shafts.

If the differential assembly is a differential with a differential lock, the left axle and the right axle of the driven axle can be forced to work at the same rotating speed by starting the differential lock after the differential assembly is switched to the four-wheel drive mode, and the difficulty removing capability of the vehicle is further improved.

It is understood that various other changes and modifications may be made by those skilled in the art based on the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the claims of the present invention.