Electric driving device, vehicle and driving method of vehicle

Abstract

The invention provides an electric driving device, a vehicle and a driving method of the vehicle, and relates to the technical field of vehicle parts, the electric driving device comprises a power transmission assembly and a joint mechanism, and the power transmission assembly is used for being arranged corresponding to a driving wheel of the vehicle; the power transmission assembly comprises a motor, a planet row assembly, a speed reduction assembly and an output shaft, the output end of the motor is in transmission connection with the planet row assembly, the input end and the output end of the speed reduction assembly are in transmission connection with the planet row assembly and the output shaft respectively, and the output shaft is used for being in transmission connection with the corresponding driving wheel; output shafts of two power transmission assemblies arranged corresponding to one driving wheel set are connected and disconnected through a joint mechanism. Thus, each driving wheel of the vehicle can be driven by one power transmission assembly, the torque of the driving wheels is increased, the electric driving device can meet the use requirement of the large-torque working condition, the driving modes such as in-situ turning around and getting out of trouble can be achieved, and the structure is simpler and more compact.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle components, and in particular, to an electric drive device, a vehicle, and a driving method for a vehicle. Background Art

[0002] The electric drive system of new energy vehicles is the core power unit of the vehicle, responsible for converting electrical energy into mechanical energy to drive the vehicle. Currently, there are mainly two types of electric drive systems on the market. One is the electric drive system with a single-motor structure, and the other is the electric drive system with a dual-motor structure. In the related art, the torque provided by the electric drive system with a single-motor structure is relatively small and cannot meet the torque requirements of the vehicle under off-road conditions. Although the electric drive system with a dual-motor structure can meet the torque requirements under off-road conditions, it usually uses a parallel-axis reduction mechanism to transmit the torque output by the motor, which not only occupies a large space but also has a heavy weight, affecting the efficiency of the entire electric drive system. Summary of the Invention

[0003] The problem solved by the present invention is: how to optimize the structure of the electric drive system so that it occupies a small space and can meet the requirements of high-torque working conditions.

[0004] To solve the above problems, the present invention provides an electric drive device, a vehicle, and a driving method for a vehicle.

[0005] In a first aspect, the present invention provides an electric drive device, including a power transmission assembly and an engagement mechanism. The power transmission assembly is arranged corresponding to the drive wheels of the vehicle. The power transmission assembly includes a motor, a planetary gear set assembly, a reduction assembly, and an output shaft. The output end of the motor is in transmission connection with the planetary gear set assembly. The input end and the output end of the reduction assembly are respectively in transmission connection with the planetary gear set assembly and the output shaft. The output shaft is used for being in transmission connection with the corresponding drive wheel. The output shafts of two power transmission assemblies corresponding to one drive wheel group are connected and disconnected through the engagement mechanism, where the drive wheel group includes a left drive wheel and a right drive wheel that are oppositely arranged in the left-right direction of the vehicle.

[0006] Optionally, there are two power transmission assemblies, and the two power transmission assemblies are respectively used to drive the left drive wheel and the right drive wheel in one drive wheel group.

[0007] Optionally, the electric drive device also includes a housing, which is arranged corresponding to the coupling mechanism, and the coupling mechanism and the two power transmission assemblies connected thereto are arranged in the corresponding housing; the planetary row assembly includes a sun gear, a planetary gear, a planetary carrier and an inner ring gear, the sun gear is coaxially connected to the motor shaft of the motor, the planetary gear is arranged on the planetary carrier and meshes with the sun gear, the inner ring gear meshes with the planetary gear, one of the planetary carrier and the inner ring gear is connected to the housing, and the other of the planetary carrier and the inner ring gear is transmission-connected to the input end of the reduction assembly.

[0008] Optionally, the inner ring gear is connected to the housing, and the planet carrier is rotatably connected to the housing via a bearing.

[0009] Optionally, the reduction assembly includes a driving gear and a driven gear that mesh with each other, the driving gear is coaxially arranged with the sun gear of the planetary gear assembly, and is transmission-connected to the other of the planetary carrier and the inner ring gear of the planetary gear assembly, and the driven gear is coaxially connected to the output shaft.

[0010] Optionally, the inner ring gear is connected to the housing, and the driving gear is connected to the planet carrier.

[0011] Optionally, the sun gear is integrally connected to the motor shaft of the corresponding motor, and / or the driven gear is integrally connected to the corresponding output shaft.

[0012] Optionally, the engagement mechanism is one of an electromagnetic clutch, a synchronizer and a dog clutch.

[0013] In a second aspect, the present invention provides a vehicle comprising the electric drive device as described above.

[0014] In a third aspect, the present invention provides a vehicle driving method, based on the above-mentioned electric driving device, wherein the vehicle driving modes include a dual-motor driving mode, an escape mode and an on-the-spot U-turn mode; The driving method comprises: When the driving mode is the dual-motor driving mode, the engaging mechanism of the electric driving device is controlled to be disconnected, and the motors in the two power transmission assemblies corresponding to one driving wheel set are controlled to output torques of the same magnitude and direction, so that the vehicle can travel normally; When the driving mode is the escape mode, the engagement mechanism is controlled to engage so that two output shafts connected to one of the driving wheel sets are connected, so that the driving wheel that slips in the driving wheel set transmits power to the driving wheel that does not slip in the driving wheel set, so that the driving wheel that slips can escape; When the driving mode is the in-situ turning mode, control the motors in the two power transmission assemblies corresponding to one driving wheel set to output torques with the same magnitude and opposite directions, so as to turn the vehicle in place.

[0015] The beneficial effects of the electric drive device of the present invention are as follows: By arranging power transmission assemblies corresponding to the number of driving wheels of the vehicle, each driving wheel of the vehicle can be driven by one power transmission assembly respectively, so as to increase the torque of the driving wheels, and further enable the electric drive device to meet the usage requirements of large-torque working conditions and improve the off-road ability of the vehicle; At the same time, by setting the power transmission assembly to include a motor, a planetary gear set assembly, a reduction assembly and an output shaft, and respectively drivingly connecting the output end of the motor and the input end of the reduction assembly to the planetary gear set assembly, and drivingly connecting the output end of the reduction assembly to the output shaft, the power output by the motor can be sequentially transmitted to the output shaft through the planetary gear set assembly and the reduction assembly, and then transmitted to the corresponding driving wheel to drive the corresponding driving wheel to rotate. Compared with the traditional use of a parallel-axis reduction mechanism to transmit torque, using a planetary gear set assembly to transmit the torque output by the motor to the reduction assembly can not only effectively reduce the volume of the electric drive device and facilitate layout, but also has a simple structure and is convenient for assembly. In addition, the electric drive device cancels the traditional differential structure, so that the volume and weight of the entire electric drive device can be further reduced, which can not only reduce the production cost, but also reduce the consumption of, for example, electric energy and improve the efficiency of the electric drive system. Moreover, by arranging an engaging mechanism between the output shafts of the two power transmission assemblies corresponding to one driving wheel set, the two output shafts (i.e., the left output shaft and the right output shaft) can be connected and disconnected under the action of the engaging mechanism. In this way, not only can the electric drive device realize various different driving modes such as the dual-motor driving mode and the in-situ turning mode according to the connection state or disconnection state of the engaging mechanism to adapt to different working conditions, but also when one driving wheel in a driving wheel set of the vehicle has a situation such as slipping, the engaging mechanism can be used to connect the output shafts of the corresponding two power transmission assemblies, so that the driving wheel with slipping can transmit the power to the other driving wheel to help the vehicle get out of trouble. Description of the Drawings

[0016] Figure 1 It is a schematic principle diagram of the electric drive device in the embodiment of the present invention when the engaging mechanism is separated; Figure 2 It is a schematic principle diagram of the electric drive device in the embodiment of the present invention when the engaging mechanism is engaged; Figure 3 It is a power transmission route diagram of the electric drive device in the embodiment of the present invention in the dual-motor driving mode; Figure 4A power transmission route diagram of the electric drive device in an on-the-spot U-turn mode in an embodiment of the present invention; Figure 5 A power transmission route diagram of the electric drive device in the escape mode in an embodiment of the present invention; Figure 6 It is a schematic flow chart of a vehicle driving method in an embodiment of the present invention.

[0017] Description of reference numerals: 1. Motor; 11. Left motor; 111. Motor shaft; 12. Right motor; 2. Planetary gear assembly; 21. Sun gear; 22. Planetary gear; 23. Planetary carrier; 24. Internal ring gear; 3. Reduction assembly; 31. Driving gear; 32. Driven gear; 4. Output shaft; 41. Left output shaft; 42. Right output shaft; 5. Engagement mechanism; 600. Drive wheel; 610. Left drive wheel; 620. Right drive wheel. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0019] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0020] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0021] In the related art, there are mainly two types of electric drive systems. One is an electric drive system with a single-motor structure, and the other is an electric drive system with a dual-motor structure. Among them, the torque provided by the electric drive system with a single-motor structure is small and cannot meet the torque requirements of the vehicle under off-road conditions. Although the electric drive system with a dual-motor structure can meet the torque requirements under off-road conditions, it usually uses a parallel-axis reduction mechanism to transmit the torque output by the motor, which not only occupies a large space but also has a heavy weight, affecting the efficiency of the entire electric drive system.

[0022] In view of the problems existing in the above-mentioned related art, the present invention provides an electric drive device, a vehicle, and a driving method for the vehicle.

[0023] Combined with Figures 1 to 5 As shown, an electric drive device provided by an embodiment of the present invention includes a power transmission assembly and an engagement mechanism 5. The power transmission assembly is correspondingly arranged with the drive wheels 600 of the vehicle; the power transmission assembly includes a motor 1, a planetary gear set assembly 2, a reduction assembly 3, and an output shaft 4. The output end of the motor 1 is in transmission connection with the planetary gear set assembly 2, and the input end and the output end of the reduction assembly 3 are respectively in transmission connection with the planetary gear set assembly 2 and the output shaft 4. The output shaft 4 is used for transmission connection with the corresponding drive wheel 600; the output shafts 4 of two power transmission assemblies correspondingly arranged with one drive wheel group are connected and disconnected through the engagement mechanism 5, wherein the drive wheel group includes a left drive wheel 610 and a right drive wheel 620 that are oppositely arranged in the left-right direction of the vehicle.

[0024] It should be noted that the power transmission assembly being correspondingly arranged with the drive wheels 600 of the vehicle means that if the vehicle uses the front wheels or the rear wheels to achieve two-wheel drive, the vehicle has two drive wheels 600. At this time, there are two power transmission assemblies in the electric drive device. If the vehicle uses the front wheels and the rear wheels to achieve four-wheel drive, the vehicle has four drive wheels 600. At this time, there are four power transmission assemblies in the electric drive device. That is to say, each drive wheel 600 of the vehicle is driven by one power transmission assembly. In addition, when the vehicle is front-wheel drive, the vehicle has one drive wheel group, and this drive wheel group is composed of a left front drive wheel and a right front drive wheel; when the vehicle is rear-wheel drive, the vehicle also has one drive wheel group, and this drive wheel group is composed of a left rear drive wheel and a right rear drive wheel; when the vehicle is four-wheel drive, the vehicle has two drive wheel groups, that is, the left front drive wheel and the right front drive wheel of the vehicle form one drive wheel group, and the left rear drive wheel and the right rear drive wheel form another drive wheel group. The left front drive wheel and the right front drive wheel are the left drive wheel 610 and the right drive wheel 620 that are oppositely arranged in the left-right direction of the vehicle, and the left rear drive wheel and the right rear drive wheel are also the left drive wheel 610 and the right drive wheel 620 that are oppositely arranged in the left-right direction of the vehicle. That is to say, each drive wheel group is composed of a left drive wheel 610 and a right drive wheel 620 that are oppositely arranged in the left-right direction of the vehicle.

[0025] Specifically, in a driving wheel set, the power transmission assembly corresponding to the left driving wheel 610 can be called the left power transmission assembly, and the power transmission assembly corresponding to the right driving wheel 620 can be called the right power transmission assembly. For the convenience of description, the components in the left power transmission assembly and the right driving assembly can be distinguished, such as Figure 3 shown, that is, the motor 1, the planetary gear set 2, the reduction assembly 3, and the output shaft 4 in the left driving assembly are respectively called the left motor 11, the left planetary gear set, the left reduction assembly, and the left output shaft 41, and the motor 1, the planetary gear set 2, the reduction assembly 3, and the output shaft 4 in the right driving assembly are respectively called the right motor 12, the right planetary gear set, the right reduction assembly, and the right output shaft 42. Among them, the left output shaft 41 is equivalent to the left half shaft and is used to connect to the left driving wheel 610 to transmit power to the left driving wheel 610, and the right output shaft 42 is equivalent to the right half shaft and is used to connect to the right driving wheel 620 to transmit power to the right driving wheel 620.

[0026] More specifically, in a power transmission assembly, the output end of the motor 1 (i.e., the motor shaft 111) is connected to, for example, the sun gear 21 in the planetary gear set 2 by spline connection or flat key connection to achieve transmission connection. The input end of the reduction assembly 3 is connected to, for example, the planet carrier 23 or the internal gear ring 24 in the planetary gear set 2 by spline connection or the like to achieve transmission connection, so that the output end of the motor 1 is connected to the input end of the reduction assembly 3 through the planetary gear set 2; and, the output end of the reduction assembly 3 is connected to the output shaft 4 by, for example, spline connection or integral connection to achieve transmission connection. The output shaft 4 is used to be connected to the corresponding driving wheel 600 for transmission connection, so that the power output by the motor 1 can be transmitted to the output shaft 4 through the planetary gear set 2 and the reduction assembly 3 in sequence, and then transmitted to the corresponding driving wheel 600 to drive the corresponding driving wheel 600 to rotate. Among them, the planetary gear set 2 can be used as a first-stage reduction structure, and the reduction assembly 3 can be used as a second-stage reduction structure. The engagement mechanism 5 is arranged between the output shafts 4 of the two power transmission assemblies corresponding to a driving wheel set. For example, it is arranged between the left output shaft 41 of the left power transmission assembly and the right output shaft 42 of the right driving assembly, so that the left output shaft 41 and the right output shaft 42 can be connected and disconnected under the action of the engagement mechanism 5. In this way, when a driving wheel 600 in a driving wheel set slips, the left output shaft 41 and the right output shaft 42 can be connected by using the engagement mechanism 5, as Figure 5 shown ( Figure 5The red arrow and the green arrow respectively represent the power transmission routes of the left motor 11 and the right motor 12, and the black thin solid line arrow represents the rotation directions of the left motor 11 and the right motor 12), so that the driving wheel 600 with slip can transmit power to another driving wheel 600, thereby increasing the torque of the driving wheel 600 without slip, enabling the driving wheel 600 without slip to drive the driving wheel 600 with slip out of trouble, and realizing the vehicle's out-of-trouble mode.

[0027] In this embodiment, the electric drive device can be provided with a power transmission assembly corresponding to the number of driving wheels 600 of the vehicle, so that each driving wheel 600 of the vehicle can be driven by a power transmission assembly respectively, to increase the torque of the driving wheel 600, and further enable the electric drive device to meet the use requirements of high-torque working conditions and improve the off-road ability of the vehicle; at the same time, by setting the power transmission assembly to include a motor 1, a planetary gear set 2, a reduction assembly 3 and an output shaft 4, and respectively drivingly connecting the output end of the motor 1 and the input end of the reduction assembly to the planetary gear set 2, and drivingly connecting the output end of the reduction assembly 3 to the output shaft 4, the power output by the motor 1 can be transmitted to the output shaft 4 through the planetary gear set 2 and the reduction assembly 3 in sequence, and then transmitted to the corresponding driving wheel 600 to drive the corresponding driving wheel 600 to rotate. Compared with the traditional use of a parallel-axis reduction mechanism to transmit torque, using the planetary gear set 2 to transmit the torque output by the motor 1 to the reduction assembly 3 can not only effectively reduce the volume of the electric drive device, facilitate layout, but also has a simple structure and is convenient for assembly. In addition, the electric drive device cancels the traditional differential structure, enabling the volume and weight of the entire electric drive device to be further reduced, which can not only reduce production costs, but also reduce the consumption of, for example, electric energy and improve the efficiency of the electric drive system. Moreover, by providing an engagement mechanism 5 between the output shafts 4 of the two power transmission assemblies corresponding to a driving wheel set, the two output shafts 4 (i.e., the left output shaft 41 and the right output shaft 42) can be connected and disconnected under the action of the engagement mechanism 5. In this way, not only can the electric drive device realize various different driving modes such as a dual-motor driving mode and a spot-turning mode according to the connection state or disconnection state of the engagement mechanism 5 to adapt to different working conditions, but also when a driving wheel 600 in a driving wheel set of the vehicle has a situation such as slip, the output shafts 4 of the corresponding two power transmission assemblies can be connected by using the engagement mechanism 5, so that the driving wheel 600 with slip can transmit power to another driving wheel 600 to help the vehicle out of trouble.

[0028] Optionally, the engagement mechanism 5 is one of an electromagnetic clutch, a synchronizer, and a dog clutch. Among them, the electromagnetic clutch realizes engagement and separation through electromagnetic force, with relatively rapid operation, suitable for scenarios requiring high-frequency switching (such as real-time power distribution), and without the need for a traditional mechanical linkage mechanism, which can reduce energy transfer losses and system complexity; the synchronizer pre-matches the rotational speed through a friction synchronizer ring, which can reduce the impact and wear during engagement, extend the component life, but requires a certain operation time, has a slower response speed than the electromagnetic clutch, and is relatively complex in structure and high in cost; the dog clutch (i.e., claw clutch) directly realizes engagement through end face teeth meshing, can withstand a greater torque, and has a compact, simple structure, easy to maintain, and high reliability, but it is necessary to ensure the rotational speed synchronization of the two output shafts 4 during engagement, otherwise there will be an impact, and it is not suitable for scenarios with frequent switching. In this embodiment, the electromagnetic clutch, the synchronizer, and the dog clutch can all be selected as the engagement mechanism 5, but considering aspects such as economy, usage scenarios, and reliability, the electromagnetic clutch is usually preferably selected as the engagement mechanism 5 in practical applications.

[0029] Optionally, as shown in Figure 2 FIG. [not shown in the original, assumed to be a figure number], the power transmission assembly has two, and the two power transmission assemblies are respectively used to drive the left drive wheel 610 and the right drive wheel 620 in a drive wheel group. In this way, the electric drive device can be applied to new energy vehicle models with front-wheel drive or rear-wheel drive.

[0030] Optionally, the electric drive device further includes a housing (not shown in the figure), the housing is correspondingly arranged with the engagement mechanism 5, and the engagement mechanism 5 and the two power transmission assemblies connected thereto are arranged in the corresponding housing. Among them, the two power transmission assemblies corresponding to a drive wheel group and an engagement mechanism 5 form a power transmission assembly group, and the power transmission assembly group is usually arranged at the front axle and / or rear axle of the vehicle. Moreover, each power transmission assembly group has a housing to protect the electric drive assembly and the engagement mechanism 5 arranged in the housing, and enables the electric drive assembly and the engagement mechanism 5 to be integrated into a whole through the housing, facilitating overall assembly.

[0031] Optionally, as shown in Figure 1 FIG. [not shown in the original, assumed to be a figure number], the planetary gear set 2 includes a sun gear 21, planet gears 22, a planet carrier 23, and an internal gear ring 24. The sun gear 21 is coaxially connected to the motor shaft 111 of the motor 1. The planet gears 22 are arranged on the planet carrier 23 and mesh with the sun gear 21. The internal gear ring 24 meshes with the planet gears 22. One of the planet carrier 23 and the internal gear ring 24 is connected to the housing, and the other of the planet carrier 23 and the internal gear ring 24 is in transmission connection with the input end of the reduction assembly 3.

[0032] In this alternative embodiment, a spline structure is generally adopted between the sun gear 21 and the corresponding motor shaft 111 to achieve a transmission connection; generally, a plurality of planet gears 22 are provided, and the plurality of planet gears 22 are evenly arranged around the sun gear 21. One of the planet carrier 23 and the ring gear 24 is generally fixedly connected to the housing by means of fasteners such as bolts; the other of the planet carrier 23 and the ring gear 24 is generally connected to, for example, the driving gear 31 of the reduction assembly 3 by a spline structure to achieve a transmission connection. When the planet carrier 23 is connected to the housing, the planet carrier 23 is fixed. At this time, the planet gear 22 only rotates about its own axis (i.e., self-rotates), and drives the ring gear 24 to rotate, so that the power is transmitted from the ring gear 24 to the reduction assembly 3; when the ring gear 24 is connected to the housing, the ring gear 24 is fixed. At this time, the planet gear 22 can rotate about the axis of the sun gear 21 (i.e., revolve) while self-rotating, and drives the planet carrier 23 to rotate, so that the power is transmitted from the planet carrier 23 to the reduction assembly 3. The power output by the motor 1 can be sequentially transmitted to the reduction assembly 3 through the motor shaft 111, the sun gear 21, and the planet carrier 23 (or the ring gear 24). In this way, the power output by the motor 1 is transmitted to the reduction assembly 3 through the planetary gear set assembly 2.

[0033] Optionally, as shown in Figure 1 , the sun gear 21 is integrally connected to the motor shaft 111 of the corresponding motor 1. Among them, the sun gear 21 in the left planetary gear set assembly is integrally connected to the motor shaft 111 of the left motor 11 by means such as welding or integral molding, and the sun gear 21 in the right planetary gear set assembly is integrally connected to the motor shaft 111 of the right motor 12 by means such as welding or integral molding. In this way, not only can the connection firmness between the sun gear 21 and the motor shaft 111 of the corresponding motor 1 be improved, the loss during power transmission be reduced, but also the number of parts can be reduced, and the convenience and efficiency of assembly can be improved.

[0034] Optionally, as shown in Figure 1 , the ring gear 24 is connected to the housing, and the planet carrier 23 is rotatably connected to the housing through a bearing.

[0035] When the planet carrier 23 is fixed and the inner gear ring 24 can rotate, a certain distance needs to be set between the inner gear ring 24 and the inner wall of the shell to ensure that the inner gear ring 24 can rotate smoothly. However, due to the distance between the inner gear ring 24 and the inner wall of the shell, the shell needs to be designed to be larger, resulting in a larger space occupied by the electric drive device. Based on this, this embodiment connects the inner gear ring 24 to the shell so that the inner gear ring 24 is fixed on the shell and does not move. In this way, the inner gear ring 24 and the inner wall of the shell can be closely connected, so that the shell can be set smaller, thereby reducing the volume and weight of the entire electric drive device and improving the efficiency of the electric drive device. In addition, the planet carrier 23 is rotatably connected to the shell through the bearing, which can ensure that the planet carrier 23 can rotate relative to the shell on the one hand, and can support the planet carrier 23 with the bearing on the other hand, so that the planet carrier 23 can smoothly transmit power to the reduction assembly 3.

[0036] Optionally, combined Figure 1 As shown, the reduction assembly 3 includes a driving gear 31 and a driven gear 32 that mesh with each other. The driving gear 31 is coaxially arranged with the sun gear 21 of the planetary gear assembly 2 and is drivingly connected to the other of the planetary carrier 23 and the inner ring gear 24 of the corresponding planetary gear assembly 2. The driven gear 32 is coaxially connected to the output shaft 4.

[0037] In this optional embodiment, one of the planet carrier 23 and the inner gear ring 24 is connected to the housing, and the other of the planet carrier 23 and the inner gear ring 24 is connected to the driving gear 31 in transmission connection. Moreover, the planet carrier 23 and the driving gear 31 or the inner gear ring 24 and the driving gear 31 are usually connected by a spline structure, for example, and the driven gear 32 and the corresponding output shaft 4 can be connected by a spline connection or an integrated connection, for example, to achieve transmission connection, which is not specifically limited here. In this way, the power output by the motor 1 can be transmitted to the driving gear 31 through the motor shaft 111, the sun gear 21, the planet carrier 23 (or the inner gear ring 24) in sequence, and then transmitted to the driven gear 32 by the driving gear 31, and then transmitted to the corresponding output shaft 4, so as to realize the transmission of the power output by the motor 1 to the output shaft 4 through the planetary gear assembly 2 and the reduction assembly 3. Moreover, the master and slave gear pairs are used as the secondary reduction structure to transmit power, which has a simple structure and is easy to assemble.

[0038] Optionally, combined Figure 1 As shown, the inner ring gear 24 is connected to the housing, and the driving gear 31 is connected to the planet carrier 23 .

[0039] When the driving gear 31 is connected to the inner gear ring 24 by transmission, if the driving gear 31 is directly meshed with the inner gear ring 24 to achieve the transmission connection, the diameter of the driving gear 31 needs to be designed to be relatively large. If the inner gear ring 24 is additionally processed to mesh with the driving gear 31 to achieve the transmission connection, the structure of the inner gear ring 24 needs to be changed. In addition, since the space occupied by the inner gear ring 24 is usually larger than that of the planet carrier 23, the volume and weight of the entire planetary gear assembly 2 may be greatly increased when the structure of the inner gear ring 24 is changed. When the driving gear 31 is connected to the planet carrier 23 by transmission, it is only necessary to process the inner spline structure meshed with the driving gear 31 on the planet carrier 23 with a smaller volume to achieve the transmission connection, without changing the structure of the inner gear ring 24. Compared with the driving gear 31 being connected to the inner gear ring 24 by transmission, the volume and weight of the planetary gear assembly 2 can be reduced. Based on this, this embodiment fixes the inner ring gear 24 on the housing and forms a transmission connection between the driving gear 31 and the planet carrier 23 to ensure that the planetary gear assembly 2 is small in size and light in weight, thereby making the structure of the power transmission assembly more compact.

[0040] Optionally, combined Figure 1 As shown, the driven gear 32 is integrally connected to the corresponding output shaft 4. The driven gear 32 in the left reduction assembly is integrally connected to the left output shaft 41 by, for example, welding or integral molding, and the driven gear 32 in the right reduction assembly is integrally connected to the right output shaft 42 by, for example, welding or integral molding. In this way, not only can the firmness of the connection between the driven gear 32 and the corresponding output shaft 4 be improved, the loss in the power transmission process can be reduced, but also the number of parts can be reduced, and the convenience and efficiency of assembly can be improved.

[0041] A vehicle provided by an embodiment of the present invention includes the electric drive device as described above.

[0042] The beneficial effects of the vehicle of this embodiment are the same as those of the above-mentioned electric drive device and will not be described in detail here.

[0043] Combination Figure 6 As shown, a vehicle driving method provided by an embodiment of the present invention is based on the above-mentioned electric driving device, and the vehicle driving modes include a dual-motor driving mode, an escape mode and an on-the-spot U-turn mode; The driving method comprises the following steps: S100, when the driving mode is a dual-motor driving mode, controlling the coupling mechanism 5 of the electric driving device to be disconnected, and controlling the motors 1 in the two power transmission assemblies corresponding to one driving wheel set to output torques of the same magnitude and direction, so that the vehicle can travel normally; Specifically, in step S100, the coupling mechanism 5 is disconnected, the left output shaft 41 and the right output shaft 42 are not connected, so that the left output shaft 41 and the right output shaft 42 cannot transmit torque, and the left motor 11 and the right motor 12 output torque in the same direction. Figure 3 As shown ( Figure 3 The red arrow and the green arrow respectively represent the power transmission routes of the left motor 11 and the right motor 12, and the thin black solid arrow represents the rotation direction of the left motor 11 and the right motor 12), so that the power output by the left motor 11 is transmitted to the left output shaft 41 via the left planetary gear assembly and the left reduction assembly in sequence to drive the left drive wheel 610 to rotate. At the same time, the power output by the right motor 12 is transmitted to the right output shaft 42 via the right planetary gear assembly and the right reduction assembly in sequence to drive the right drive wheel 620 to rotate, thereby realizing the dual-motor drive mode of the vehicle.

[0044] S200, when the driving mode is the escape mode, controlling the engagement mechanism 5 to engage, so that two output shafts 4 connected to one driving wheel set are connected, so that the driving wheel 600 that has slipped in the driving wheel set transmits power to the driving wheel 600 that has not slipped in the driving wheel set, so that the driving wheel 600 that has slipped can escape; Specifically, in step S200, if one of the driving wheels 600 in a driving wheel group slips, the coupling mechanism 5 can be controlled to engage, so as to connect the left output shaft 41 and the right output shaft 42 by using the coupling mechanism 5. Figure 5 As shown ( Figure 5 The red arrow and the green arrow respectively represent the power transmission routes of the left motor 11 and the right motor 12, and the thin black solid arrow represents the rotation direction of the left motor 11 and the right motor 12), so that the slipping driving wheel 600 can transmit power to another driving wheel 600 in the driving wheel group to increase the torque of the non-slipping driving wheel 600, so that the non-slipping driving wheel 600 can drive the slipping driving wheel 600 out of trouble, thereby realizing the vehicle's escape mode.

[0045] S300, when the driving mode is the on-the-spot U-turn mode, the coupling mechanism 5 is controlled to be disconnected, and the motors 1 in the two power transmission assemblies corresponding to one driving wheel set are controlled to output torques of the same magnitude and opposite directions, so as to make the vehicle turn on the spot.

[0046] Specifically, in step S300, the coupling mechanism 5 is disconnected, and the left motor 11 and the right motor 12 output torques in opposite directions. Figure 4 As shown ( Figure 4The red arrow and the green arrow respectively represent the power transmission routes of the left motor 11 and the right motor 12, and the thin black solid arrow represents the rotation direction of the left motor 11 and the right motor 12), so that the left driving wheel 610 and the right driving wheel 620 can obtain torques in opposite directions, which is convenient for the vehicle to perform actions such as turning around on the spot, thereby realizing the vehicle's turning around on the spot mode.

[0047] In this embodiment, the driving method of steps S100 to S300 can be used to control the vehicle to realize the vehicle's dual-motor driving mode, escape mode and on-the-spot U-turn mode; and switching between different driving modes is achieved by controlling the disconnection and engagement of the coupling mechanism 5 to facilitate control and timely response.

[0048] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An electric drive device, characterized in that, The invention comprises a power transmission assembly and a coupling mechanism (5), wherein the power transmission assembly is used to be arranged corresponding to the driving wheel (600) of the vehicle; the power transmission assembly comprises a motor (1), a planetary gear assembly (2), a reduction assembly (3) and an output shaft (4), wherein the output end of the motor (1) is transmission-connected to the planetary gear assembly (2), the input end and the output end of the reduction assembly (3) are transmission-connected to the planetary gear assembly (2) and the output shaft (4) respectively, and the output shaft (4) is used to be transmission-connected to the corresponding driving wheel (600); the output shafts (4) of the two power transmission assemblies corresponding to one driving wheel group are connected and disconnected through the coupling mechanism (5), wherein the driving wheel group comprises a left driving wheel (610) and a right driving wheel (620) which are arranged opposite to each other in the left-right direction of the vehicle.

2. The electric drive device according to claim 1, characterized in that, Two power transmission assemblies are provided, and the two power transmission assemblies are respectively used to drive the left driving wheel (610) and the right driving wheel (620) in one driving wheel group.

3. The electric drive device according to claim 1, characterized in that, The motor also comprises a housing, wherein the housing is arranged corresponding to the coupling mechanism (5), and the coupling mechanism (5) and the two power transmission assemblies connected thereto are arranged in the corresponding housing; the planetary gear assembly (2) comprises a sun gear (21), a planetary gear (22), a planetary carrier (23) and an inner gear ring (24), wherein the sun gear (21) is coaxially connected to the motor shaft of the motor (1), the planetary gear (22) is arranged on the planetary carrier (23) and meshes with the sun gear (21), the inner gear ring (24) meshes with the planetary gear (22), one of the planetary carrier (23) and the inner gear ring (24) is connected to the housing, and the other of the planetary carrier (23) and the inner gear ring (24) is drivingly connected to the input end of the reduction assembly (3).

4. The electric drive device according to claim 3, characterized in that, The inner gear ring (24) is connected to the housing, and the planet carrier (23) is rotatably connected to the housing via a bearing.

5. The electric drive device according to claim 3, characterized in that, The reduction assembly (3) comprises a driving gear (31) and a driven gear (32) meshing with each other, wherein the driving gear (31) is coaxially arranged with the sun gear (21) of the planetary gear assembly (2) and is drivingly connected to the other of the planet carrier (23) and the inner gear ring (24) of the planetary gear assembly (2), and the driven gear (32) is coaxially connected to the output shaft (4).

6. The electric drive device according to claim 5, characterized in that, The inner gear ring (24) is connected to the housing, and the driving gear (31) is connected to the planet carrier (23).

7. The electric drive device according to claim 5, characterized in that The sun gear (21) is integrally connected to the motor shaft (111) of the corresponding motor (1), and / or the driven gear (32) is integrally connected to the corresponding output shaft (4).

8. The electric drive device according to claim 1, characterized in that, The engagement mechanism (5) is one of an electromagnetic clutch, a synchronizer and a dog clutch.

9. A vehicle, characterized in that, The invention comprises an electric drive device as claimed in any one of claims 1 to 8.

10. A driving method for a vehicle, based on the electric drive device according to any one of claims 1-8, characterized in that, The driving modes of the vehicle include a dual-motor driving mode, an escape mode and an on-the-spot U-turn mode; The driving method comprises: When the driving mode is the dual-motor driving mode, the engaging mechanism (5) of the electric driving device is controlled to be disconnected, and the motors (1) in the two power transmission assemblies corresponding to one driving wheel set are controlled to output torques of the same magnitude and direction, so that the vehicle can travel normally; When the driving mode is the escape mode, the engagement mechanism (5) is controlled to engage, so that two output shafts (4) connected to one of the driving wheel sets are connected, so that the driving wheel (600) that is slipping in the driving wheel set transmits power to the driving wheel (600) that is not slipping in the driving wheel set, so that the driving wheel (600) that is slipping can escape; When the driving mode is the on-the-spot U-turn mode, the motors (1) in the two power transmission assemblies corresponding to one driving wheel set are controlled to output torques of the same magnitude and opposite directions, so as to make the vehicle turn on the spot.

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