Wheel type vehicle rear axle assembly with electromagnetic double-clutch gearbox

Abstract

The invention discloses an electromagnetic double-clutch transmission wheel type vehicle rear axle assembly which is provided with a differential mechanism with a driven gear, a driving gear, a large gear and a small gear are coaxially arranged on an axially fixed transmission shaft in parallel, the driving gear is meshed with the driven gear, and the large gear and the small gear are in staggered transmission connection with a motor through an electromagnetic clutch type transmission mechanism. Two electromagnetic coils are arranged on the fixing ring side by side, an armature is fixedly arranged on the outer side of each of the two opposite ends in the axial direction of the fixing ring, the clutch outer core and the fixing ring are axially fixed, and a fast gear clutch assembly and a slow gear clutch assembly are arranged in the clutch outer core side by side in a circumferential transmission mode. An inner shifting structure acting on the fast gear clutch assembly and the slow gear clutch assembly is arranged in the clutch outer core. A fast gear and slow gear transmission set in transmission connection with the transmission shaft is arranged in the clutch outer core and used for achieving fast gear and slow gear switching transmission. And the electromagnetic force of the two electromagnetic coils realizes the axial sliding of the clutch outer core, so that the fast-gear clutch assembly and the slow-gear clutch assembly are staggered for separation and reunion.

Description

Technical Field

[0001] The invention relates to a wheeled motor vehicle, in particular to an electromagnetic dual-clutch gearbox wheeled rear axle assembly on a wheeled vehicle. Background Art

[0002] Wheeled vehicles are divided into two-wheeled vehicles, three-wheeled vehicles and four-wheeled vehicles according to the number of their wheels. For rear-wheeled three-wheeled vehicles and four-wheeled vehicles, a rear axle assembly is generally required on these two vehicles to provide rear-wheel drive for the vehicle. In order to adapt to different working conditions of the vehicle during driving, it is usually necessary to set a dual-clutch transmission mechanism in the rear wheel assembly. Traditional dual-clutch transmission mechanisms generally use hydraulic oil as the working medium. This type of hydraulic dual-clutch transmission drive component mainly relies on a complex hydraulic system to achieve clutch control and shifting operations. The hydraulic system includes multiple components such as hydraulic pumps, hydraulic valves, and oil pipes. These components not only occupy a large space, but also increase the complexity and maintenance cost of the system.

[0003] A Chinese patent document (publication number: CN 216382431U) discloses a two-speed automatic transmission shaft, a power box and an electric vehicle based on an electromagnetic clutch, wherein the transmission shaft comprises a low-speed driven gear and a high-speed driven gear which are only rotatably arranged on the output shaft; a two-way spiral overrunning clutch structure is formed between the low-speed driven gear and the output shaft; a synchronizer is also arranged between the high-speed driven gear and the output shaft, and the synchronizer is axially movably connected to the output shaft through a spline matching structure; the synchronizer is also connected to an electromagnetic clutch, and the electromagnetic clutch is used for the combination and separation control of the synchronizer and the high-speed driven gear. The power box comprises the above-mentioned two-speed transmission shaft and a differential assembly. The electric vehicle has the above-mentioned power box. The beneficial effect of the present invention is that the transmission shaft is combined with the electromagnetic clutch and the two-way overrunning clutch to form three gears of high and low speed forward rotation and low speed reverse rotation, and the gear shifting operation is convenient and the running noise is low. The power box has the same excellent characteristics as the above-mentioned transmission shaft; the electric vehicle has an electronic parking function to prevent slipping.

[0004] The corresponding structural arrangement in this power box is unreasonable, and the overall structural compactness is poor, resulting in a relatively large overall volume and weight of the power box, inconvenient arrangement, and increased power consumption of the vehicle during driving. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an electromagnetic dual-clutch gearbox wheeled vehicle rear axle assembly, in which the electromagnetic clutch transmission mechanism has good compactness and occupies a small space.

[0006] In order to solve the technical problem, the technical solution of the present invention is as follows: an electromagnetic dual-clutch gearbox wheeled vehicle rear axle assembly, including a motor and a differential, a passive gear is provided on the differential, a driving gear, a large gear, and a small gear are coaxially arranged in parallel on an axially fixed transmission shaft, the diameter of the large gear is larger than the diameter of the small gear, the driving gear is meshed with the passive gear, the large gear and the small gear are staggeredly connected to the motor through an electromagnetic clutch transmission mechanism, characterized in that the electromagnetic clutch transmission mechanism includes an axially movable fixed ring, two electromagnetic coils are arranged in parallel on the fixed ring, and an armature is fixedly arranged on the outer sides of the opposite axial ends of the fixed ring respectively; The cylindrical clutch outer core is axially fixed to the fixed ring, and the clutch outer core is circumferentially fixed to the motor shaft in an axially sliding transmission connection. Under the drive of the motor shaft, the clutch outer core can rotate relative to the fixed ring; a fast-gear clutch assembly and a slow-gear clutch assembly are arranged in parallel in the clutch outer core, and the clutch outer core is circumferentially transmission-connected to both the fast-gear clutch assembly and the slow-gear clutch assembly. An inner shifting structure is axially fixedly arranged in the clutch outer core, and driven by the clutch outer core, the inner shifting structure is used to act axially on the fast-gear clutch assembly and the slow-gear clutch assembly respectively; A fast gear shaft and a slow gear shaft are axially fixedly arranged in the clutch outer core, and the fast gear shaft and the slow gear shaft can be plugged together to rotate relative to each other in the circumferential direction; a fast gear is arranged on the fast gear shaft, and the fast gear clutch assembly is connected to the fast gear shaft in a clutch circumferential transmission manner; a slow gear is arranged on the slow gear shaft, and the slow gear clutch assembly is connected to the slow gear shaft in a clutch circumferential transmission manner; the slow gear and the fast gear are both located axially outside the clutch outer core, the diameter of the slow gear is smaller than the diameter of the fast gear, the slow gear is meshed with the large gear, and the fast gear is meshed with the small gear; The fixing ring slides axially between the two armatures under the action of electromagnetic forces generated by the two electromagnetic coils being energized, thereby achieving staggered clutching of the fast gear clutch assembly and the slow gear clutch assembly.

[0007] The clutch mentioned above should be understood in a common sense, that is, the corresponding transmission components are separated and the power transmission is interrupted; the corresponding transmission components are engaged and the power transmission is smoothly realized. "The fast gear clutch assembly and the fast gear shaft are connected in a clutch circumferential transmission manner" means that after the fast gear clutch assembly is engaged, the power can be transmitted, and after the fast gear clutch assembly is separated, the power transmission is interrupted. "The slow gear clutch assembly and the slow gear shaft are connected in a clutch transmission manner" also has the same meaning as the above.

[0008] Whether the two electromagnetic coils are energized is directly controlled by the controller on the vehicle. Instructions can be sent to the controller manually through the shift button, or the corresponding sensors can be used to control the vehicle's driving conditions. The slow gear and high torque driving mode are selected when the vehicle starts, climbs a slope, or is heavily loaded, and the fast gear driving mode is selected when the vehicle is traveling on a flat road or traveling without load. When the electromagnetic coils are energized, a magnetic field is generated, and a large magnetic force is generated between the adjacent electromagnetic coils and the armature. Under the action of this magnetic force, the fixed ring moves toward the corresponding armature, so that the corresponding clutch components are engaged together to realize the transmission of power between the corresponding transmission mechanisms. When both electromagnetic coils are not energized, the two clutch components cannot be engaged to meet the transmission requirements. The axial spacing between the two electromagnetic coils is generally in the centimeter level. When both electromagnetic coils are not energized, the spacing between the fixed ring and the armature is generally in the millimeter level.

[0009] The clutch assembly can be the friction plate and clamping plate structure described below, or it can be a concave-convex matching structure between the facing ends of corresponding components.

[0010] Furthermore, the inner shifting structure includes an annular inner top plate and a stop plate, the inner top plate and the stop plate are coaxially stacked together, and the stop plate is clamped on the inner circumferential surface of the clutch outer core. This inner shifting structure can also be a shift fork, and correspondingly, the clutch assembly is the above-mentioned concave-convex matching structure. By providing the inner top plate and the stop plate, the axial stable pressing of the clutch assembly can be achieved, and the engagement stability between the friction plate clutch assemblies can be improved. In addition, the inner shifting structure is an inner top plate and a stop plate, and the two clutch assemblies can also be separated in the axial direction, which facilitates the assembly of the electromagnetic clutch transmission mechanism.

[0011] Furthermore, a plurality of chucks extending obliquely toward the same side are integrally formed at the outer edge of the anti-rotation plate, and the chucks are correspondingly abutted against a plurality of grooves formed on the inner circumferential surface of the clutch outer core, and the chucks are abutted against the outer edge of the inner top plate. Generally, the anti-rotation plate and the inner top plate are installed in the clutch outer core by axial crimping. By setting the chucks, the anti-rotation plate has good position stability in the clutch outer core during assembly, and the installation position of the inner top plate is also stable, which is convenient for axial action on the clutch assembly.

[0012] Furthermore, the clutch assembly includes a plurality of annular friction plates and card plates coaxially arranged together, the friction plates and card plates in the fast clutch assembly and the slow clutch assembly are spaced apart in the axial direction, the outer edge of the card plate is matched with the inner peripheral surface of the clutch inner core by a spline structure, the friction plate in the slow clutch assembly is matched with the slow gear shaft by a spline structure, and the friction plate in the fast clutch assembly is matched with the fast gear shaft by a spline structure; a slow gear stopper is axially fixed and protruded on the slow gear shaft, and the slow gear stopper and the inner shifting structure are arranged on opposite sides of the slow clutch assembly; a fast gear stopper is axially fixed and protruded on the fast gear shaft, and the fast gear stopper and the inner shifting structure are arranged on opposite sides of the fast clutch assembly. Through the arrangement of these structures, the vehicle can switch between the two driving states conveniently and quickly, which is beneficial to the transmission engagement of the clutch assembly and can well meet the actual work needs.

[0013] Furthermore, the slow gear is in a "convex" shape, the slow gear is arranged horizontally, and the slow gear is plugged and fixed in the slow gear shaft; the fast gear shaft is plugged in the slow gear and the slow gear shaft, and the fast gear and the fast gear clutch assembly are arranged on opposite sides of the slow gear and the slow gear shaft. This can effectively improve the compactness of the overall structure and make the electromagnetic clutch transmission mechanism small in size.

[0014] Furthermore, a coupling seat is fixedly connected to the end of the clutch inner core away from the end, a power input shaft is fixedly connected to the axial position of the coupling seat, and the power input shaft and the motor shaft are axially slidably connected in transmission. The coupling seat is provided to facilitate the transmission connection between the power input shaft and the clutch inner core, and to provide stable radial support for the clutch inner core.

[0015] Furthermore, the fixing ring and the connecting seat overlap in the axial direction, and a supporting bearing is provided between the overlapping parts of the fixing ring and the connecting seat. The supporting bearing provides radial support for the fixing ring, and also makes the fixing ring not need to rotate with the connecting seat.

[0016] Furthermore, a fixed cylinder is fixedly connected to one end of the motor facing the power input shaft, the armature is fixedly connected in the fixed cylinder, the end of the fixed cylinder facing the motor is closed, the other end of the fixed cylinder is open, and the power input shaft passes through the closed end of the fixed cylinder with a gap. The fixed cylinder provides support for the electromagnetic clutch transmission mechanism as a whole, facilitating the connection and assembly between the corresponding structures.

[0017] Furthermore, the armature is in a circular ring shape, and the outer peripheral surface of the armature is attached to the inner peripheral surface of the fixed cylinder; the fixed ring is an electromagnetic core, and the two electromagnetic coils are in circular rings of equal diameter, and the electromagnetic coils are separately embedded in the electromagnetic core. This structure is reasonably arranged, can generate a large magnetic attraction, and well meets the actual work needs.

[0018] Furthermore, needle bearings are provided between the closed end of the fixed cylinder and the power input shaft, and between the fast gear shaft and the slow gear shaft, and an oil seal is provided between the power input shaft and the closed end of the fixed cylinder. Lubricating oil can be filled into the electromagnetic transmission mechanism to ensure the smooth movement of the corresponding structure. In addition, the provision of needle bearings can also provide stable radial support between the corresponding structures, so that the internal structure has good balance.

[0019] Compared with the prior art, the present invention has the following beneficial effects: through the setting of the cylindrical clutch outer core, the clutch transmission between the two clutch components can be realized, the overall structure is compact, the overall volume is small, the weight is light, which helps to maintain the lightness and flexibility of the vehicle and can reduce the driving energy consumption. The axial movement of the clutch outer core is realized by the magnetic attraction between the electromagnetic coil and the armature. When the clutch outer core moves axially, the corresponding clutch component is axially acted on by the inner pull structure, so that the clutch component is in a state that meets the working condition requirements. The overall design is reasonable and the working stability is good.

[0020] Compared with ordinary hydraulic transmission mechanisms, electromagnetic dual-clutch transmission uses the magnetic force generated by electromagnets or electromagnetic coils to control the engagement and disengagement of the clutch. The electromagnetic dual-clutch transmission mechanism directly drives the clutch through electromagnetic force. The driving components are only electromagnetic coils and control systems, with smaller mass and space, simple and compact structure, and simple maintenance. Traditional hydraulic dual-clutch transmissions rely on hydraulic systems to control the clutch and shift gears, and the hydraulic system itself has certain response delays and energy losses, and the shift time is more than 0.2-0.5 seconds. Due to the fast response speed of electromagnetic force characteristics, electromagnetic dual-clutch transmission does not require other mechanical structures but directly drives the clutch through electromagnetic force, thereby achieving faster shifting operations and realizing the engagement and disengagement of the clutch. The shift response time can reach 0.1 seconds. The clutch in the electromagnetic dual-clutch transmission is directly driven by electromagnetic force, without the need for complex mechanical transmission mechanisms, reducing the loss of energy during the transmission process; the rapid response speed of the electromagnetic dual-clutch transmission can complete the engagement and disengagement actions in a very short time, thereby reducing the energy waste caused by long shifting time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the rear axle assembly of the electromagnetic dual-clutch gearbox wheeled vehicle.

[0022] Figure 2 yes Figure 1 Longitudinal section view of .

[0023] Figure 3 It is an enlarged cross-sectional view of part of the structure of the electromagnetic clutch transmission mechanism.

[0024] Figure 4It is a schematic diagram of the partial structural assembly of the electromagnetic clutch transmission mechanism.

[0025] Figure 5 It is an exploded view of the electromagnet core, clutch outer core and clutch assembly.

[0026] Figure 6 It is an exploded view of the clutch outer core and clutch assembly.

[0027] In the figure, 1, rear axle; 2, large gear; 3, small gear; 4, passive gear; 5, driving gear; 6, motor; 7, fixed cylinder; 8, fixed cylinder; 8, deep groove ball bearing; 9, fast gear; 10, slow gear; 11, differential; 12, clutch outer core; 121, groove; 13, transmission shaft; 14, electromagnetic coil; 15, armature; 16, support bearing; 17, power input shaft; 18, oil seal; 19, needle bearing; 20, fast gear stopper; 21, connecting seat; 22, fast gear clutch assembly; 23, anti-rotation plate; 24, inner top plate; 25, slow gear clutch assembly; 26, slow gear stopper; 27, fast gear shaft; 28, slow gear shaft; 29, electromagnetic core; 30, card plate; 31, friction plate. DETAILED DESCRIPTION

[0028] In conjunction with the drawings in the specification, the electromagnetic dual-clutch gearbox wheeled vehicle rear axle assembly is arranged on the rear axle 1 of the wheeled vehicle, and includes a motor 6 and a differential 11. The differential 11 is provided with a passive gear 4, which is transmission-connected to the power shaft in the rear axle 1, and the two ends of the power shaft are transmission-connected to the wheels.

[0029] The transmission shaft 13 is coaxially provided with a driving gear 5, a large gear 2, and a small gear 3 in parallel. The two ends of the transmission shaft 13 are respectively sleeved and fixed with deep groove ball bearings 8, which are fixed in the housing, so that the transmission shaft 13 can be axially fixed. The diameter of the large gear 2 is larger than the diameter of the small gear 3. The driving gear 5 is meshed with the passive gear 4 to realize the transmission of power on the transmission shaft 13 to the passive gear 4. The large gear 2 and the small gear 3 are staggered and connected to the motor 6 through an electromagnetic clutch transmission mechanism, and the power on the motor 6 will not be transmitted to the large gear 2 and the small gear 3 at the same time.

[0030] The electromagnetic clutch transmission mechanism includes an axially movable fixed ring, which is an electromagnetic core 29. Two electromagnetic coils 14 are arranged in parallel in the electromagnetic core 29. The two electromagnetic coils 14 are circular rings with equal diameters. The electromagnetic coils 14 are separated and coaxially embedded in the electromagnetic core 29. An armature 15 is fixedly arranged on the outer sides of the opposite ends of the electromagnetic coil 14 in the axial direction. When the electromagnetic coil 14 is energized, a magnetic attraction force is generated on the armature 15.

[0031] The cylindrical clutch outer core 12 is axially fixed with the electromagnet core 29, and the clutch outer core 12 is located radially inside the electromagnet core 29. The clutch outer core 12 is axially fixed and axially slidably connected to the motor shaft in a transmission manner. Under the drive of the motor shaft, the clutch outer core 12 can rotate relative to the electromagnet core 29. A fast clutch assembly 22 and a slow clutch assembly 25 are arranged in parallel in the clutch outer core 12, and the clutch outer core 12 is circumferentially connected to the fast clutch assembly 22 and the slow clutch assembly 25. An inner shifting structure is axially fixedly arranged in the clutch outer core 12. When the clutch outer core 12 moves toward the corresponding armature 15, the inner shifting structure is used to axially act on the fast clutch assembly 22 and the slow clutch assembly 25 respectively under the drive of the clutch outer core 12, so that the corresponding clutch assemblies form a connection that meets the transmission requirements.

[0032] A fast gear shaft 27 and a slow gear shaft 28 are axially fixedly arranged in the clutch outer core 12. The fast gear shaft 27 and the slow gear shaft 28 are plugged together so as to be relatively rotatable in the circumferential direction. Deep groove ball bearings 8 are sleeved and fixed on the outer circumferences of the fast gear shaft 27 and the slow gear shaft 28, and the deep groove ball bearings 8 are fixed in the outer shell, so that the fast gear shaft 27 and the slow gear shaft 28 are axially fixed. A fast gear 9 is sleeved and fixedly connected to the fast gear shaft 27, and the fast gear clutch assembly 22 is connected to the fast gear shaft 27 in a clutch circumferential transmission connection. A slow gear 10 is arranged on the slow gear shaft 28, and the slow gear clutch assembly 25 is connected to the slow gear shaft 28 in a clutch circumferential transmission connection. To facilitate transmission connection, the slow gear 10 and the fast gear 9 are both located on the axial outside of the clutch outer core 12. The diameter of the slow gear 10 is smaller than the diameter of the fast gear 9. The slow gear 10 is meshed with the large gear 2 on the outside of the clutch outer core 12, and the fast gear 9 is meshed with the small gear 3 on the outside of the clutch outer core 12.

[0033] The electromagnetic core 29 slides axially between the two armatures 15 under the action of the electromagnetic force generated by the two electromagnetic coils 14, thereby achieving staggered clutching of the fast clutch assembly 22 and the slow clutch assembly 25. The two clutch assemblies will not engage at the same time. When one set of clutch assemblies is engaged, the other set of clutch assemblies is in a disengaged state.

[0034] The inner shifting structure includes an annular inner top plate 24 and a stop plate 23. The stop plate 23 is made of stainless steel. The inner top plate 24 and the stop plate 23 are coaxially stacked together. The stop plate 23 is clamped on the inner circumference of the clutch outer core 12. Since the stop plate 23 is clamped on the inner circumference of the clutch outer core 12, the inner shifting structure is axially stable in the clutch outer core 12. A plurality of clamps extending obliquely toward the same side are integrally formed at the outer edge of the stop plate 23. A plurality of grooves 121 are formed on the inner circumference of the clutch outer core 12. The grooves 121 are arranged along the axial direction of the clutch outer core 12. These grooves 121 are evenly distributed in the circumferential direction of the clutch outer core 12. The number of clamps and grooves 121 is the same, and one clamp correspondingly abuts against the bottom surface of one groove 121. When the anti-rotation plate 23 is assembled, the anti-rotation plate 23 is stamped in the extending direction away from the chuck, so that the chuck is deformed to a certain extent. The deformed chuck abuts against the outer edge of the inner top plate 24, thereby realizing the axial fixation of the inner top plate 24 in the clutch outer core 12.

[0035] The clutch assembly includes a plurality of annular friction plates 31 and a card plate 30 coaxially arranged in parallel. The axial end surface of the friction plate 31 forms a grid-like pattern to increase friction. The card plate 30 is made of stainless steel. The friction plates 31 and the card plates 30 in the fast clutch assembly 22 and the slow clutch assembly 25 are spaced apart in the axial direction. The outer edge of the card plate 30 is matched with the inner circumference of the clutch outer core 12 by a spline structure, the friction plate 31 in the slow clutch assembly 25 is matched with the slow gear shaft 28 by a spline structure, and the friction plate 31 in the fast clutch assembly 22 is matched with the fast gear shaft 27 by a spline structure. The outer edge of the friction plate 31 will not contact the inner circumference of the clutch inner core, and the inner edge of the card plate 30 will not contact the slow gear shaft 28 and the fast gear shaft 27. A protruding convex body is integrally formed at the inner edge of the friction plate 31, and the number of the protruding bodies corresponds to the spline grooves on the fast gear shaft 27 and the slow gear shaft 28, and the protruding bodies on the friction plate 31 are respectively inserted into the spline grooves with corresponding gaps. A protruding convex body is also integrally formed at the outer edge of the clamping plate 30, and the number of the protruding bodies corresponds to the number of the grooves 121 on the inner circumferential surface of the clutch outer core 12, and the protruding bodies on the clamping plate 30 are respectively inserted into the grooves 121 with corresponding gaps. In order to block the clutch assembly in the axial direction, a slow gear stopper 26 is axially fixed and protrudingly provided on the slow gear shaft 28, and the slow gear stopper 26 and the inner shifting structure are arranged on opposite sides of the slow gear clutch assembly 25; a fast gear stopper 20 is axially fixed and protrudingly provided on the fast gear shaft 27, and the fast gear stopper 20 and the inner shifting structure are arranged on opposite sides of the fast gear clutch assembly 22. Under the blocking action of the slow gear stopper 26 and the fast gear stopper 20, when the inner shifting structure axially pushes the clutch assembly, the clamping plate 30 and the friction plate 31 in the clutch assembly axially abut against each other to generate static friction, and the generated static friction is greater than the transmission requirement of the corresponding power.

[0036] The slow gear 10 is in a "convex" shape, and is arranged horizontally. The slow gear 10 is plugged and fixed in the slow gear shaft 28. The fast gear shaft 27 is plugged in the slow gear 10 and the slow gear shaft 28, and the fast gear 9 and the fast gear clutch assembly 22 are arranged on opposite sides of the slow gear 10 and the slow gear shaft 28. As shown in the figure, the slow gear clutch assembly 25 is located on the left side of the anti-rotation plate 23, and the fast gear clutch assembly 22 is located on the right side of the anti-rotation plate 23, and the card plate 30 and the friction plate 31 in the slow gear clutch assembly 25 are four groups to meet the transmission requirements of slow speed and high torque; the card plate 30 and the friction plate 31 in the fast gear clutch assembly 22 are two groups to meet the transmission requirements of fast speed and small torque.

[0037] A connecting seat 21 is inserted and fixedly connected in the end of the clutch outer core 12 away from the said end, and the connecting seat 21 is a block. A power input shaft 17 is fixedly connected at the axial position of the connecting seat 21, and the power input shaft 17 and the motor 6 are both arranged horizontally. The power input shaft 17 and the motor shaft are arranged coaxially, and a spline structure that is sleeved and matched is provided between the adjacent ends of the power input shaft 17 and the motor shaft, and the power input shaft 17 can slide axially relative to the motor shaft. The electromagnetic core 29 and the connecting seat 21 overlap in the axial direction, and a supporting bearing 16 is provided between the overlapping parts of the electromagnetic core 29 and the connecting seat 21, and the supporting bearing 16 is relatively axially fixed to the electromagnetic core 29 and the connecting seat 21.

[0038] A fixed cylinder 7 is fixedly connected to one end of the motor 6 facing the power input shaft 17. The fixed cylinder 7 is closed at one end facing the motor 6, and the other end of the fixed cylinder 7 is open. The closed end of the fixed cylinder 7 is fixed to the end of the motor 6 by bolts. The armature 15 is annular, and the outer circumference of the armature 15 is fitted and fixed to the inner circumference of the fixed cylinder 7. The power input shaft 17 passes through the closed end of the fixed cylinder 7 with a gap. Needle bearings 19 are respectively provided between the closed end of the fixed cylinder 7 and the power input shaft 17, and between the fast gear shaft 27 and the slow gear shaft 28, and an oil seal 18 is provided between the power input shaft 17 and the closed end of the fixed cylinder 7.

Claims

1. An electromagnetic dual-clutch gearbox wheeled vehicle rear axle assembly, comprising a motor and a differential, wherein a passive gear is arranged on the differential, and a driving gear, a large gear, and a small gear are arranged coaxially and in parallel on an axially fixed transmission shaft, wherein the diameter of the large gear is greater than that of the small gear, the driving gear is meshed with the passive gear, and the large gear and the small gear are staggeredly connected to the motor through an electromagnetic clutch transmission mechanism, characterized in that: The electromagnetic clutch transmission mechanism comprises an axially movable fixed ring, on which two electromagnetic coils are arranged in parallel, and an armature is fixedly arranged on the outer sides of the two opposite ends of the fixed ring in the axial direction; The cylindrical clutch outer core is axially fixed to the fixed ring, and the clutch outer core is circumferentially fixed to the motor shaft in an axially sliding transmission connection. Under the drive of the motor shaft, the clutch outer core can rotate relative to the fixed ring; a fast-gear clutch assembly and a slow-gear clutch assembly are arranged in parallel in the clutch outer core, and the clutch outer core is circumferentially transmission-connected to both the fast-gear clutch assembly and the slow-gear clutch assembly. An inner shifting structure is axially fixedly arranged in the clutch outer core, and driven by the clutch outer core, the inner shifting structure is used to act axially on the fast-gear clutch assembly and the slow-gear clutch assembly respectively; A fast gear shaft and a slow gear shaft are axially fixedly arranged in the clutch outer core, and the fast gear shaft and the slow gear shaft can be plugged together to rotate relative to each other in the circumferential direction; a fast gear is arranged on the fast gear shaft, and the fast gear clutch assembly is connected to the fast gear shaft in a clutch circumferential transmission manner; a slow gear is arranged on the slow gear shaft, and the slow gear clutch assembly is connected to the slow gear shaft in a clutch circumferential transmission manner; the slow gear and the fast gear are both located axially outside the clutch outer core, the diameter of the slow gear is smaller than the diameter of the fast gear, the slow gear is meshed with the large gear, and the fast gear is meshed with the small gear; The fixing ring slides axially between the two armatures under the action of electromagnetic forces generated by the two electromagnetic coils being energized, thereby achieving staggered clutching of the fast gear clutch assembly and the slow gear clutch assembly.

2. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 1, characterized in that: The inner shifting structure comprises an annular inner top plate and a rotation-stopping plate, the inner top plate and the rotation-stopping plate are coaxially stacked together, and the rotation-stopping plate is clamped on the inner circumferential surface of the clutch outer core.

3. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 2, characterized in that: The outer edge of the anti-rotation plate is integrally formed with a plurality of chucks extending obliquely toward the same side, the chucks correspondingly abut against a plurality of grooves formed on the inner circumference of the clutch outer core, and the chucks abut against the outer edge of the inner top plate.

4. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 3, characterized in that: The clutch assembly includes a plurality of annular friction plates and card plates coaxially and parallelly arranged together. The friction plates and card plates in the fast gear clutch assembly and the slow gear clutch assembly are spaced apart in the axial direction, and a spline structure cooperates between the outer edge of the card plate and the inner circumference of the clutch inner core, a spline structure cooperates between the friction plates in the slow gear clutch assembly and the slow gear shaft, and a spline structure cooperates between the friction plates in the fast gear clutch assembly and the fast gear shaft; a slow gear stopper is axially fixed and protrudingly provided on the slow gear shaft, and the slow gear stopper and the inner shifting structure are arranged on opposite sides of the slow gear clutch assembly; a fast gear stopper is axially fixed and protrudingly provided on the fast gear shaft, and the fast gear stopper and the inner shifting structure are arranged on opposite sides of the fast gear clutch assembly.

5. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 4, characterized in that: The slow gear is in a "convex" shape, the slow gear is horizontally arranged, and the slow gear is plugged and fixedly connected in the slow gear shaft; the fast gear shaft is plugged in the slow gear and the slow gear shaft, and the fast gear and the fast gear clutch assembly are arranged on opposite sides of the slow gear and the slow gear shaft.

6. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 1, characterized in that: A connecting seat is fixedly connected to the end of the clutch inner core away from the end, and a power input shaft is fixedly connected to the axial position of the connecting seat. The power input shaft and the motor shaft are axially slidably connected in transmission.

7. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 6, characterized in that: The fixing ring and the connecting seat overlap in the axial direction, and a supporting bearing is arranged between the overlapping parts of the fixing ring and the connecting seat.

8. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 6, characterized in that: A fixed cylinder is fixedly connected to one end of the motor facing the power input shaft, the armature is fixedly connected in the fixed cylinder, the end of the fixed cylinder facing the motor is closed, the other end of the fixed cylinder is open, and the power input shaft passes through the closed end of the fixed cylinder with a gap.

9. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 8, characterized in that: The armature is in the shape of a circular ring, and the outer peripheral surface of the armature is fixedly connected to the inner peripheral surface of the fixed cylinder; the fixed ring is an electromagnet core, and the two electromagnetic coils are in the shape of circular rings with equal diameters, and the electromagnetic coils are separately embedded in the electromagnet core.

10. The electromagnetic dual clutch transmission wheeled vehicle rear axle assembly according to claim 8, characterized in that: Needle bearings are respectively arranged between the closed end of the fixed cylinder and the power input shaft, and between the fast gear shaft and the slow gear shaft, and an oil seal is arranged between the power input shaft and the closed end of the fixed cylinder.

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