Electric drive assembly and vehicle

Abstract

The application provides an electric drive assembly and a vehicle. The electric drive assembly comprises a first output shaft, a second output shaft, a differential lock and an actuator. The differential lock comprises a first tooth hub, a second tooth hub and a tooth sleeve. The first tooth hub is sleeved on the periphery of the first output shaft, and the second tooth hub is sleeved on the periphery of the second output shaft. The tooth sleeve moves along the axial direction of the first output shaft to drive the differential lock to switch between a locked state and an unlocked state. In the locked state, the inner teeth of the tooth sleeve are engaged with the first outer teeth of the first tooth hub and the second outer teeth of the second tooth hub. In the unlocked state, the inner teeth of the tooth sleeve are engaged with one of the first outer teeth of the first tooth hub and the second outer teeth of the second tooth hub. The actuator drives the tooth sleeve to move along the axial direction of the first output shaft. In a harsh environment, the differential lock is in the locked state, and the excess torque generated by one side motor is transmitted to the other side, thereby ensuring the passability and stability of the vehicle.

Description

Technical Field

[0001] This application relates to the field of electric drive assemblies, and more particularly to electric drive assemblies and vehicles. Background Technology

[0002] Most distributed drive systems for new energy vehicles on the market currently use a single motor with a parallel shaft and lack a differential lock. Power is mostly transmitted to each wheel via the drive shaft, which lacks the ability to adapt to complex road conditions. This results in distributed drive systems having issues such as insufficient torque and weak vehicle traction. Consequently, in harsh environments such as mud, soft ground, and potholes, increased driving resistance reduces the traction of the drive wheels, while insufficient power output makes the vehicle prone to wheel slippage, skidding, and even getting stuck. Utility Model Content

[0003] This application provides an electric drive assembly and vehicle with a differential lock.

[0004] This application provides an electric drive assembly, including a first output shaft, a second output shaft, a differential lock, and an actuator. The second output shaft and the first output shaft are sequentially arranged along their axial direction. The differential lock includes a first gear hub, a second gear hub, and a gear sleeve. The first gear hub is sleeved around the first output shaft and is operatively connected to the first output shaft. The first gear hub includes a first external tooth. The second gear hub is sleeved around the second output shaft and is operatively connected to the second output shaft. The second gear hub includes a second external tooth. The gear sleeve includes an internal tooth. The gear sleeve moves along the axial direction of the first output shaft to drive the differential lock to switch between a locked state and an unlocked state. In the locked state, the internal tooth meshes with both the first and second external teeth. In the unlocked state, the internal tooth meshes with one of the first and second external teeth. The actuator drives the gear sleeve to move along the axial direction of the first output shaft.

[0005] Furthermore, the electric drive assembly includes a positioning seat, and the differential lock is provided with a first recessed groove, wherein in the locked state, the end of the positioning seat is located within the first recessed groove; and / or, The differential lock is provided with a second recessed groove, and in the unlocked state, the end of the positioning seat is located in the second recessed groove.

[0006] Furthermore, the positioning seat includes a positioning member, the end of which is located in the first recessed groove or the second recessed groove. When the toothed sleeve moves, the positioning member is stretched and extended by force to move from the first recessed groove to the second recessed groove or from the second recessed groove to the first recessed groove.

[0007] Furthermore, the positioning seat includes a housing and an elastic element. The housing forms a receiving cavity, the elastic element is located inside the receiving cavity, and the positioning element is movably received inside the receiving cavity. When the gear sleeve moves, the differential lock presses against the positioning element, and the positioning element presses against the elastic element.

[0008] Furthermore, the differential lock includes a fork frame and a shift fork, the fork frame is connected to the actuator, the shift fork is connected to the gear sleeve, and the fork frame drives the shift fork to move.

[0009] Furthermore, the first recessed groove and the second recessed groove are provided on the fork frame.

[0010] Furthermore, the differential lock includes a connecting shaft connecting the fork frame and the shift fork, wherein the fork frame drives the shift fork to move along the connecting shaft; or, both the fork frame and the shift fork are fixed to the connecting shaft, wherein the fork frame drives the connecting shaft and the shift fork to move synchronously.

[0011] Furthermore, the axial direction of the connecting shaft is parallel to the axial direction of the first output shaft.

[0012] Furthermore, the fork bracket has a first hole, the shift fork has a second hole, and the connecting shaft is assembled in the first hole and the second hole. The differential lock includes a first fixing member and a second fixing member. The fork bracket has a first assembly hole, the shift fork has a second assembly hole, and the connecting shaft has a third assembly hole and a fourth assembly hole. The first fixing member is assembled in the first assembly hole and the third assembly hole to fix the fork bracket and the connecting shaft. The second fixing member is assembled in the second assembly hole and the fourth assembly hole to fix the shift fork and the connecting shaft.

[0013] This application also provides a vehicle including the electric drive assembly.

[0014] The differential lock of this embodiment includes a first gear hub, a second gear hub, and a gear sleeve. The first gear hub is sleeved around the first output shaft and is drive-connected to the first output shaft. The second gear hub is sleeved around the second output shaft and is drive-connected to the second output shaft. The gear sleeve moves along the axial direction of the first output shaft to switch the differential lock between a locked state and an unlocked state. In the locked state, the internal gear meshes with both the first and second external gears. In the unlocked state, the internal gear meshes with either the first or second external gear. The actuator drives the gear sleeve to move along the axial direction of the first output shaft. In harsh environments, such as muddy, soft terrain, or potholes, when the differential lock is in the locked state, excess torque generated by one motor is transmitted to the other side, ensuring the vehicle's passability and stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an electric drive assembly according to an exemplary embodiment of this application; Figure 2 yes Figure 1 Side view of the electric drive assembly shown; Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the electric drive assembly along line AA, where the differential lock is in the locked state. Figure 4 yes Figure 2 The diagram shows a cross-sectional view of the electric drive assembly along line AA, where the differential lock is in the unlocked state. Figure 5 yes Figure 1 A schematic diagram of the toothed sleeve shown; Figure 6 yes Figure 1 A schematic diagram of the first gear hub shown; Figure 7 yes Figure 1 A schematic diagram of the second gear hub is shown; Figure 8 yes Figure 1 The diagram shows the alignment of the positioning seat with the forklift. Figure 9 yes Figure 8 The diagram shows a cross-sectional view of the positioning seat.

[0016] Reference numerals: First output shaft, 1; First retaining ring, 11; Second output shaft, 2; Second retaining ring, 21; First gear hub, 31; First external gear, 311; Second gear hub, 32; Second external gear, 321; Gear sleeve, 33; Internal gear, 331; Base, 332; First protrusion, 333; Second protrusion, 334; Slot, 335; Fork bracket, 34; First recessed groove, 341; Second recessed groove, 342; First hole, 343; First assembly hole, 344; Second... Assembly part, 345; second limiting part, 346; third protrusion, 347; shift fork, 35; second hole, 351; second assembly hole, 352; first assembly part, 353; first limiting part, 354; connecting shaft, 36; third assembly hole, 361; fourth assembly hole, 362; first fixing member, 37; second fixing member, 38; actuator, 4; displacement sensor, 5; positioning seat, 6; positioning member, 61; outer shell, 62; receiving cavity, 621; elastic member, 63. Detailed Implementation

[0017] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0018] If the embodiments of the present application involve terms indicating directionality or positional relationship (such as up, down, left, right, front, rear, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between various components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the direction indication or positional relationship also changes accordingly. In addition, terms such as "first" and "second" involved in the embodiments of the present application are only used for the purpose of description convenience, and cannot be construed as indicating or implying relative importance.

[0019] An embodiment of the present application provides a vehicle including an electric drive assembly. The electric drive assembly is a core component of a new energy vehicle, which is equivalent to the engine of a traditional fuel vehicle, and is mainly responsible for converting electrical energy into mechanical energy to drive the vehicle.

[0020] Refer to Figures 1 to 7 , the electric drive assembly of the embodiment of the present application includes a first output shaft 1, a second output shaft 2, a differential lock (not shown) and an actuator 4. The second output shaft 2 and the first output shaft 1 are sequentially arranged along the axial direction of the first output shaft 1.

[0021] The differential lock includes a first hub 31, a second hub 32 and a gear sleeve 33. The first hub 31 is sleeved on the periphery of the first output shaft 1 and is in driving connection with the first output shaft 1. The first hub 31 includes first external teeth 311. The second hub 32 is sleeved on the periphery of the second output shaft 2 and is in driving connection with the second output shaft 2. The second hub 32 includes second external teeth 321. The gear sleeve 33 includes internal teeth 331.

[0022] In one embodiment, the first hub 31 and the first output shaft 1 are in meshing transmission through teeth. Refer to Figure 6 , the inner contour of the first hub 31 is provided with first teeth 312 to mesh with second teeth (not shown) on the outer contour of the first output shaft 1.

[0023] In one embodiment, the second hub 32 and the second output shaft 2 are in meshing transmission through teeth. Refer to Figure 7 , the inner contour of the second hub 32 is provided with third teeth 322 to mesh with fourth teeth (not shown) on the outer contour of the second output shaft 2.

[0024] In one embodiment, one end of the first output shaft 1 is in concave-convex fit with one end of the first hub 31, and a first retaining ring 11 is assembled on the other end of the first output shaft 1 to prevent axial axial movement of the first output shaft 1 relative to the first hub 31.

[0025] In another embodiment, the first output shaft 1 is in interference fit with the first gear hub 31 to prevent axial play of the first output shaft 1 relative to the first gear hub 31, so the first snap ring 11 is omitted, which makes the structure of the differential lock simpler and the cost lower.

[0026] In one embodiment, one end of the second output shaft 2 is in concave-convex fit with one end of the second gear hub 32, and a second snap ring 21 is assembled on the other end of the second output shaft 2 to prevent axial play of the second output shaft 2 relative to the second gear hub 32.

[0027] In another embodiment, the second output shaft 2 is in interference fit with the second gear hub 32 to prevent axial play of the second output shaft 2 relative to the second gear hub 32, so the second snap ring 21 is omitted, which makes the structure of the differential lock simpler and the cost lower.

[0028] The gear sleeve 33 moves along the axial direction of the first output shaft 1 to drive the differential lock to switch between a locked state and an unlocked state. When the vehicle runs normally, the differential lock is in the unlocked state. In harsh environments, such as muddy, soft sections, pits, etc., the differential lock is in the locked state, and the excess torque generated by the motor on one side can be transmitted to the other side. For example, when one side wheel is slipping and the other side wheel can normally grip the ground to transmit torque, all torque will be transmitted to the side that can normally grip the ground to transmit torque, while the slipping side has no torque. It ensures the passability and stability of the vehicle under special road conditions; at the same time, the differential lock has a simple structure, which can reduce energy consumption during vehicle driving.

[0029] Refer to Figure 3 , in the locked state, the internal teeth 331 mesh with both the first external teeth 311 and the second external teeth 321. At this time, the torque at the first gear hub 31 can be transmitted to the second gear hub 32 through the gear sleeve 33, or the torque at the second gear hub 32 can be transmitted to the first gear hub 31 through the gear sleeve 33.

[0030] Refer to Figure 4 , in the unlocked state, the internal teeth 331 mesh only with the second external teeth 321, and may also mesh only with the first external teeth 311.

[0031] The actuator 4 drives the gear sleeve 33 to move along the axial direction of the first output shaft 1.

[0032] In one embodiment, the internal teeth 331, the first external teeth 311 and the second external teeth 321 are spline teeth, which have significant advantages in connection strength, centering accuracy, load transmission capacity and other aspects, and are particularly suitable for mechanical transmission scenarios with high rotation speed, large load and high precision.

[0033] In one embodiment, the controller of the electric drive assembly outputs current to the actuator 4. In one embodiment, when the differential lock is switched from the unlocked state to the locked state, the controller calculates the moved displacement according to the number of operating Hall sectors in the motor of the actuator 4, and stops when the target displacement is reached, so as to ensure the accuracy of the unlocked state and the locked state.

[0034] In one embodiment, the electric drive assembly includes a displacement sensor 5. Calibration is performed through the displacement sensor 5 to confirm whether the gear sleeve 33 reaches the target position, so as to ensure that the differential lock moves from the unlocked state to the locked state.

[0035] Refe Figures 3 to 4 rring Figures 8 to 9 to, in one embodiment, the electric drive assembly includes a positioning seat 6. The differential lock is provided with a first recessed groove 341, and in the locked state, the end of the positioning seat 6 is located in the first recessed groove 341, so that the differential lock is kept in the locked state.

[0036] In one embodiment, the differential lock is provided with a second recessed groove 342. In the unlocked state, the end of the positioning seat 6 is located in the second recessed groove 342, so that the differential lock is kept in the unlocked state.

[0037] In one embodiment, the positioning seat 6 includes a positioning member 61, and the end of the positioning member 61 is located in the first recessed groove 341 or the second recessed groove 342. When the gear sleeve 33 moves, the positioning member 61 expands and contracts under force so as to be able to move from the first recessed groove 341 to the second recessed groove 342 or from the second recessed groove 342 to the first recessed groove 341.

[0038] In one embodiment, the positioning seat 6 includes a housing 62 and an elastic member 63. The housing 62 encloses a receiving cavity 621, and the elastic member 63 is located in the receiving cavity 621. The positioning member 61 is movably received in the receiving cavity 621. When the gear sleeve 33 moves, the differential lock presses the positioning member 61, and the positioning member 61 presses the elastic member 63. The elastic force of the elastic member 63 drives the positioning member 61 to reset, so as to ensure that the end of the positioning member 61 enters the first recessed groove 341 or the second recessed groove 342, and ensure its holding function.

[0039] In one embodiment, the differential lock includes a fork frame 34 and a shift fork 35 that are separately arranged. The fork frame 34 is connected to the actuator 4, the shift fork 35 is connected to the gear sleeve 33, and the fork frame 34 drives the shift fork 35 to move. In another embodiment, the fork frame 34 and the shift fork 35 are integrally arranged, so that the structure of the differential lock is simpler and the cost is lower.

[0040] In one embodiment, the first recessed groove 341 and the second recessed groove 342 are arranged on the fork frame 34, which facilitates the processing and forming of the first recessed groove 341 and the second recessed groove 342.

[0041] In one embodiment, the differential lock includes a connecting shaft 36 connecting the fork yoke carrier 34 and the shift fork 35. Both the fork yoke carrier 34 and the shift fork 35 are fixed to the connecting shaft 36, and the fork yoke carrier 34 drives the connecting shaft 36 and the shift fork 35 to move synchronously, so that the structural stability of the differential lock is better.

[0042] See Figure 4 , in one embodiment, the fork yoke carrier 34 is provided with a first hole 343. The shift fork 35 is provided with a second hole 351. The connecting shaft 36 is assembled in the first hole 343 and the second hole 351. The differential lock includes a first fixing member 37 and a second fixing member 38.

[0043] See Figures 3 to 4 and Figure 8 , the fork yoke carrier 34 is provided with a first assembly hole 344, and the shift fork 35 is provided with a second assembly hole 352. The connecting shaft 36 is provided with a third assembly hole 361 and a fourth assembly hole 362. The first fixing member 37 is assembled in the first assembly hole 344 and the third assembly hole 361 to fix the fork yoke carrier 34 and the connecting shaft 36, which facilitates the assembly of the fork yoke carrier 34 and the connecting shaft 36. The second fixing member 38 is assembled in the second assembly hole 352 and the fourth assembly hole 362 to fix the shift fork 35 and the connecting shaft 36, which facilitates the assembly of the shift fork 35 and the connecting shaft 36.

[0044] In one embodiment, the fork yoke carrier 34 drives the shift fork 35 to move along the connecting shaft 36.

[0045] In one embodiment, the axial direction of the connecting shaft 36 is parallel to the axial direction of the first output shaft 1, which reduces the axial space requirement.

[0046] In one embodiment, in order to shorten the axial length of the electric drive assembly, the diameter of the first output shaft 1 is different from that of the second output shaft 2. See Figure 3 , the diameter of the first output shaft 1 is larger than that of the second output shaft 2, and the end of the first output shaft 1 is located in the shaft hole of the second output shaft 2, which can shorten the axial length of the electric drive assembly. In order to accommodate the different diameters of the first output shaft 1 and the second output shaft 2, the inner diameters of the first gear hub 31 and the second gear hub 32 are also different. See Figure 3 , the inner diameter of the first gear hub 31 is larger than the inner diameter of the second gear hub 32.

[0047] See Figures 1 to 5 , the shift fork 35 includes a first assembling portion 353 and first limiting portions 354 extending from the first assembling portion 353 to both sides. The first assembling portion 353 is columnar, and the second hole 351 and the second assembling hole 352 are provided on the first assembling portion 353.

[0048] In one embodiment, the gear sleeve 33 includes a base portion 332, and a first protruding portion 333 and a second protruding portion 334 extending from the outer side of the base portion 332. The base portion 332 is annular, and the internal teeth 331 are disposed on the base portion 332. The first protruding portion 333 and the second protruding portion 334 are arranged along the axial direction of the first output shaft 1. A clamping slot 335 is provided between the first protruding portion 333 and the second protruding portion 334. The end of the first limiting portion 354 is located in the clamping slot 335, which ensures that the shift fork 35 can drive the gear sleeve 33 to move, and facilitates the assembly of the shift fork 35 and the gear sleeve 33.

[0049] Reference Figure 8 , the fork bracket 34 includes a second assembling portion 345, and a second limiting portion 346 and a third protruding portion 347 extending from the second assembling portion 345. The second limiting portion 346 is connected to the actuator 4. The second assembling portion 345 is columnar, and the first hole 343 and the first assembling hole 344 are disposed on the second assembling portion 345. The first recessed groove 341 and the second recessed groove 342 are disposed on the third protruding portion 347 and arranged along the axial direction of the first output shaft 1.

[0050] In another embodiment, the first recessed groove 341 and the second recessed groove 342 can also be disposed on the shift fork 35 or the connecting shaft 36.

[0051] The first assembling portion 353 and the second assembling portion 345 are arranged along the axial direction of the first output shaft 1.

[0052] In one embodiment, the electric drive assembly is a distributed electric drive assembly. A distributed electric drive assembly is an advanced electric vehicle drive system, which dispersedly arranges drive motors near each wheel of the vehicle or directly integrates the drive motors into the wheels, so as to realize independent drive and control for each wheel, and achieve a rotation speed difference by respectively controlling the rotation speeds of the drive motors on two sides.

[0053] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflicts. The protection scope of the present application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric drive assembly, characterized in that, include: First output axis; The second output shaft is arranged sequentially with the first output shaft along its axial direction; A differential lock includes a first gear hub, a second gear hub, and a gear sleeve. The first gear hub is sleeved around the periphery of a first output shaft and is operatively connected to the first output shaft. The first gear hub includes a first external tooth. The second gear hub is sleeved around the periphery of a second output shaft and is operatively connected to the second output shaft. The second gear hub includes a second external tooth. The gear sleeve includes an internal tooth. The gear sleeve moves along the axial direction of the first output shaft to switch the differential lock between a locked state and an unlocked state. In the locked state, the internal tooth engages with both the first and second external teeth. In the unlocked state, the internal tooth engages with one of the first and second external teeth. The actuator drives the gear sleeve to move along the axial direction of the first output shaft.

2. The electric drive assembly according to claim 1, characterized in that, The electric drive assembly includes a positioning seat, and the differential lock has a first recessed groove. In the locked state, the end of the positioning seat is located within the first recessed groove; and / or, The differential lock is provided with a second recessed groove, and in the unlocked state, the end of the positioning seat is located in the second recessed groove.

3. The electric drive assembly according to claim 2, characterized in that, The positioning seat includes a positioning member, the end of which is located in the first recessed groove or the second recessed groove. When the toothed sleeve moves, the positioning member is stretched and extended by force so that it can move from the first recessed groove to the second recessed groove or from the second recessed groove to the first recessed groove.

4. The electric drive assembly according to claim 3, characterized in that, The positioning seat includes a housing and an elastic element. The housing forms a receiving cavity, and the elastic element is located inside the receiving cavity. The positioning element is movably received inside the receiving cavity. When the gear sleeve moves, the differential lock presses against the positioning element, and the positioning element presses against the elastic element.

5. The electric drive assembly according to claim 3, characterized in that, The differential lock includes a fork frame and a shift fork. The fork frame is connected to the actuator, and the shift fork is connected to the gear sleeve. The fork frame drives the shift fork to move.

6. The electric drive assembly according to claim 5, characterized in that, The first recessed groove and the second recessed groove are provided on the fork frame.

7. The electric drive assembly according to claim 5, characterized in that, The differential lock includes a connecting shaft connecting the fork frame and the shift fork, wherein the fork frame drives the shift fork to move along the connecting shaft; or, both the fork frame and the shift fork are fixed to the connecting shaft, wherein the fork frame drives the connecting shaft and the shift fork to move synchronously.

8. The electric drive assembly according to claim 7, characterized in that, The axial direction of the connecting shaft is parallel to the axial direction of the first output shaft.

9. The electric drive assembly according to claim 7, characterized in that, The fork frame has a first hole, the shift fork has a second hole, and the connecting shaft is assembled in the first hole and the second hole. The differential lock includes a first fixing member and a second fixing member. The fork frame has a first assembly hole, the shift fork has a second assembly hole, and the connecting shaft has a third assembly hole and a fourth assembly hole. The first fixing member is assembled in the first assembly hole and the third assembly hole to fix the fork frame and the connecting shaft. The second fixing member is assembled in the second assembly hole and the fourth assembly hole to fix the shift fork and the connecting shaft.

10. A vehicle, characterized in that, Includes the electric drive assembly as described in any one of claims 1 to 9.

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