Vehicle and motor driving system thereof

Abstract

The invention relates to the technical field of motor driving of vehicles, particularly provides a vehicle and a motor driving system thereof, and aims to compress the Y-direction size of a dual-motor driving system on the premise of not reducing the performance of the dual-motor driving system. To this end, the motor driving system of the vehicle according to the present invention comprises: a motor assembly; the motor assembly can be connected with wheels of the vehicle through the speed reducing mechanism assembly; wherein the speed reducing mechanism assembly comprises multiple stages of transmission mechanisms, and an idle wheel mechanism is arranged between at least one pair of adjacent transmission mechanisms in the multiple stages of transmission mechanisms. By means of the structure, the center distance of the motor driving system can be enlarged on the premise that performance is guaranteed through the idle wheel mechanism, and therefore the axial size of the motor driving system can be reduced on the premise that the enlarged center distance is reasonably utilized.

Description

Technical Field

[0001] The present invention relates to the technical field of motor drive, and specifically provides a vehicle and a motor drive system thereof. Background Art

[0002] Take electric vehicles among new energy vehicles as an example. They use motors as their power source. Specifically, they use power batteries (storage batteries) as their power source. By providing electrical energy to the motors, the motors provide the torque required for the vehicle to travel. Wheel-side motors that configure motors close to the wheels are a typical motor configuration method, while dual-motor drive systems that arrange separate motors for each wheel to achieve separate torque and vector control for a single drive wheel are typical configuration methods for wheel-side motors.

[0003] Taking the dual-motor drive system as an example, the dual-motor drive system currently generally has the problem of occupying a large space. Taking the more common back-to-back structure as an example, because the pitch circle diameter of the gear corresponding to the input shaft (primary transmission mechanism) is small, it often leads to a large degree of waste in the intermediate space, which is not conducive to realizing the highly integrated compact design of the dual-motor electric drive system. Specifically, due to the output requirements of the powertrain performance, the transmission ratio and center distance of the primary transmission mechanism cannot be expanded to the limit, which usually leads to a large Y-direction space of the dual-motor drive system. In particular, when the vehicle has strict requirements on the Y-direction (the width direction of the vehicle or the lateral direction) space, it is not conducive to the layout of the vehicle and even difficult to complete the layout of the dual-motor electric drive system in the vehicle. Therefore, how to compress the size of the dual-motor drive system, especially the size of the Y-direction space, without reducing the performance of the dual-motor drive system has become an urgent problem to be solved. In fact, it is also one of the hot issues in the current research on the dual-motor drive system. Summary of the invention

[0004] In order to at least partially solve the above technical problems, in a first aspect, the present invention provides a motor drive system for a vehicle, the motor drive system comprising: a motor assembly; and a reduction mechanism assembly, wherein the motor assembly can be connected to the wheels of the vehicle through the reduction mechanism assembly; wherein the reduction mechanism assembly comprises a multi-stage transmission mechanism, and an idler mechanism is arranged between at least one pair of adjacent transmission mechanisms in the multi-stage transmission mechanism.

[0005] With such a configuration, it is possible to expand the center distance of the motor drive system while ensuring performance through the idler gear mechanism, and thus reduce the axial dimension while making reasonable use of the expanded center distance.

[0006] It is understandable that those skilled in the art can determine the number of transmission mechanisms included in the reduction mechanism assembly and the number of corresponding idler assemblies according to actual needs. For example, the number of transmission mechanisms includes three levels, an idler mechanism is provided between the primary transmission mechanism and the secondary transmission mechanism, and an idler mechanism is also provided between the secondary transmission mechanism and the tertiary transmission mechanism.

[0007] For the above motor drive system, in a possible implementation manner, the reduction mechanism assembly includes an input shaft assembly, and the idler gear mechanism is drivingly connected to the input shaft assembly.

[0008] With such a configuration, it is possible to rationally utilize the space existing due to the small gear of the input shaft assembly through the idler gear mechanism.

[0009] It can be understood that, when the reduction mechanism assembly includes a multi-stage transmission mechanism, an idler mechanism can be directly arranged between the input shaft assembly and the last stage transmission mechanism, or an intermediate transmission mechanism can be arranged between the input shaft assembly and the last stage transmission mechanism and then the idler mechanism can be arranged between the input shaft assembly and the intermediate transmission mechanism.

[0010] For the above-mentioned motor drive system, in a possible implementation manner, the reduction mechanism assembly includes an input shaft assembly, an output shaft assembly and an intermediate shaft assembly arranged therebetween, and the idler mechanism is arranged between the input shaft assembly and the intermediate shaft assembly.

[0011] Through such a configuration, a specific composition mode of the reduction gear assembly is provided. For example, those skilled in the art can determine the gear type included in the input shaft / output shaft / intermediate shaft assembly and the transmission ratio of the combination of the three according to actual needs, and those skilled in the art can determine the size of the idler gear mechanism according to actual needs.

[0012] For the above-mentioned motor drive system, in a possible implementation manner, the motor drive system includes a housing assembly, and the idler gear mechanism is disposed on the housing assembly via a bearing assembly.

[0013] Through such a configuration, a possible way of configuring the motor drive system with an idler mechanism is given. It is understandable that those skilled in the art can determine the specific position of the bearing connection and the corresponding bearing connection method according to actual needs. Exemplarily, the idler mechanism includes a connecting shaft, which is inserted into the mounting hole of the housing and can be connected via a bearing.

[0014] For the above-mentioned motor drive system, in a possible implementation manner, the idler mechanism includes an idler, the housing assembly includes a supporting portion extending into the idler, the inner ring of the bearing assembly cooperates with the supporting portion, and the outer ring of the bearing assembly cooperates with the idler.

[0015] With such a configuration, it is possible to achieve compactness of the bearing connection and avoid interference with other bearing connections.

[0016] For the above-mentioned motor drive system, in a possible implementation, the motor drive system includes an oil cooling system assembly, the oil cooling system assembly includes an oil channel assembly, and at least a portion of the oil channel assembly is integrated inside the housing assembly.

[0017] With such a structure, under the premise of integrated setting, the risk of oil channel leakage is reduced because there are fewer oil channels leaking out.

[0018] For the above-mentioned motor drive system, in a possible implementation manner, the motor drive system includes a pressure filter and / or an oil pump assembly and / or a cooler assembly, and the oil pump assembly and / or the cooler assembly are arranged in the housing assembly.

[0019] Through such a configuration, a possible form of the oil cooling system assembly constituting the motor drive system is provided.

[0020] It is understandable that those skilled in the art can determine the location and corresponding setting method of the pressure filter / oil pump assembly / cooler assembly on the housing assembly according to actual needs, such as fixing it on the housing assembly by screwing, clamping, welding, etc.

[0021] For the above motor drive system, in a possible implementation manner, the vehicle includes a disengagement mechanism disposed between the motor drive system and the wheel.

[0022] Wherein, the disengagement mechanism is an integrated structure; and / or

[0023] The disengagement mechanism is integrated with the speed reduction mechanism assembly.

[0024] Through such a configuration, it is possible to achieve an integrated arrangement of the speed reduction mechanism assembly to a certain extent, so that the motor drive system including the speed reduction mechanism assembly occupies more space. The integrated structure of the integrated design can be a commercially available structure or a structure designed by a person skilled in the art according to actual needs.

[0025] For the above motor drive system, in a possible implementation manner, the motor drive system is a dual-motor drive system.

[0026] In a second aspect, the present invention provides a vehicle, comprising the motor drive system of any one of the above-mentioned vehicles.

[0027] It can be understood that the vehicle has all the technical effects of the motor drive system of the aforementioned vehicle, which will not be repeated here.

[0028] Proposal 1. A motor drive system for a vehicle, characterized in that the motor drive system comprises:

[0029] Motor assembly; and

[0030] A reduction mechanism assembly, wherein the motor assembly can be connected to the wheels of the vehicle through the reduction mechanism assembly;

[0031] Wherein, the reduction mechanism assembly comprises a multi-stage transmission mechanism, and an idler gear mechanism is arranged between at least one pair of adjacent transmission mechanisms in the multi-stage transmission mechanism.

[0032] Proposal 2. The motor drive system according to Proposal 1 is characterized in that the reduction mechanism assembly includes an input shaft assembly, and the idler gear mechanism is drivingly connected to the input shaft assembly.

[0033] Proposal 3. The motor drive system according to Proposal 1 is characterized in that the reduction mechanism assembly includes an input shaft assembly, an output shaft assembly and an intermediate shaft assembly arranged therebetween, and the idler mechanism is arranged between the input shaft assembly and the intermediate shaft assembly.

[0034] Proposal 4. The motor drive system according to Proposal 1 is characterized in that the motor drive system includes a housing assembly, and the idler gear mechanism is arranged on the housing assembly through a bearing assembly.

[0035] Proposal 5. The motor drive system according to Proposal 4 is characterized in that the idler mechanism includes an idler, the housing assembly includes a supporting portion extending into the idler, the inner ring of the bearing assembly cooperates with the supporting portion, and the outer ring of the bearing assembly cooperates with the idler.

[0036] Proposal 6. The motor drive system according to Proposal 5 is characterized in that the motor drive system includes an oil cooling system assembly, the oil cooling system assembly includes an oil channel assembly, and at least a portion of the oil channel assembly is integrated inside the housing assembly.

[0037] Proposal 7. The motor drive system according to Proposal 6 is characterized in that the motor drive system includes a pressure filter and / or an oil pump assembly and / or a cooler assembly, and the oil pump assembly and / or the cooler assembly are arranged in the housing assembly.

[0038] Proposal 8. The motor drive system according to Proposal 1, wherein the vehicle includes a disengagement mechanism provided between the motor drive system and the wheel,

[0039] Wherein, the disengagement mechanism is an integrated structure; and / or

[0040] The disengagement mechanism is integrated with the speed reduction mechanism assembly.

[0041] Proposal 9. The motor drive system according to any one of Proposals 1 to 8, characterized in that the motor assembly includes a motor shaft, and the motor shaft is provided with a shaft current diversion structure,

[0042] Wherein, the shaft current diversion structure includes a conductive ring and a junction box, and the motor shaft can be electrically connected to the junction box via the conductive ring.

[0043] Proposal 10. The motor drive system according to Proposal 9 is characterized in that the junction box includes a cover body, and the conductive ring is arranged on the cover body in an interference fit manner.

[0044] Proposal 11. The motor drive system according to Proposal 9 is characterized in that the motor shaft is a hollow shaft, a plug is arranged inside the hollow shaft, the plug, the hollow shaft and the junction box construct an axial current drainage area, and the conductive ring is arranged in the axial current drainage area.

[0045] Proposal 12. The motor drive system according to Proposal 11 is characterized in that the hollow shaft is provided with an oil drain structure at a position corresponding to the shaft current diversion area.

[0046] Proposal 13. The motor drive system according to Proposal 1 is characterized in that the motor drive system is a dual-motor drive system.

[0047] Proposal 14. A vehicle, characterized in that the vehicle includes the motor drive system of the vehicle according to any one of Proposals 1 to 13. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The preferred embodiment of the present invention is described below by taking the reduction mechanism assembly including a two-stage transmission mechanism as an example and referring to the accompanying drawings, in which:

[0049] Figure 1 A schematic diagram showing the structure of a dual-motor drive system for a vehicle according to an embodiment of the present invention Figure 1 ,The figure shows the principle of the dual-motor drive system;

[0050] Figure 2 A schematic diagram showing the structure of a dual-motor drive system for a vehicle according to an embodiment of the present invention Figure 2 , the figure shows the power transmission components;

[0051] Figure 3 A schematic diagram showing the structure of a dual-motor drive system for a vehicle according to an embodiment of the present invention Figure 3, the figure shows the connection relationship between the components in the form of an axonometric diagram;

[0052] Figure 4 A schematic diagram showing the installation of an idler gear mechanism of a dual-motor drive system of a vehicle on a housing assembly according to an embodiment of the present invention;

[0053] Figure 5 A schematic diagram showing an integration method of a pressure filter in a dual-motor drive system of a vehicle according to another embodiment of the present invention; and

[0054] Figure 6 A schematic structural diagram showing a shaft current diversion structure in a dual-motor drive system of a vehicle according to an embodiment of the present invention.

[0055] List of reference numerals:

[0056] 100. Dual motor drive system;

[0057] 1. Motor assembly; 11. Motor end cover; 12. Stator; 13. Motor shaft;

[0058] 2. Rotary transformer assembly;

[0059] 3. Speed ​​reduction mechanism assembly; 31. Input shaft assembly; 32. Intermediate shaft assembly; 33. Output shaft assembly; 34. Idler gear mechanism;

[0060] 4. Disengagement mechanism;

[0061] 5. Shell assembly; 51. Support part; 52. Intermediate shell; 521. Accommodating part;

[0062] 6. PEU assembly;

[0063] 7. Oil cooling system assembly;

[0064] 72. Filter press; 721. Filter paper; 73. Oil pump assembly; 74. Cooler assembly;

[0065] 8. Bearing assembly; 81. Bearing outer ring; 82. Bearing inner ring;

[0066] 9. Shaft current drainage structure;

[0067] 91. Conductive ring; 92. Junction box (EM junction box); 921. Box cover; 93. Plug; 94. Shaft current drainage area; 95. Oil drain groove;

[0068] 200. Wheel. DETAILED DESCRIPTION

[0069] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0070] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0071] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In addition, in order to better illustrate the present invention, many specific details are given in the following specific embodiments. Those skilled in the art should understand that the present invention can also be implemented without certain specific details. In some examples, the principles of the idler mechanism, shaft current drainage, etc., which are well known to those skilled in the art, are not described in detail in order to highlight the main purpose of the present invention.

[0073] Main reference Figure 1 and Figure 4In a possible implementation, the dual-motor drive system 100 mainly includes two sets of subsystem assemblies corresponding to two coaxial wheels 200. Taking the subsystem assembly corresponding to the left wheel as an example, it mainly includes a motor assembly 1, a rotary transformer assembly 2 configured on the power input side of the motor assembly 1, a reduction mechanism assembly 3 connected to the power output shaft of the motor assembly 1, a disengagement mechanism 4 and a housing assembly 5, wherein the reduction mechanism assembly 3 includes an input shaft assembly 31 as a primary transmission mechanism, an intermediate shaft assembly 32 as a secondary transmission mechanism, and an output shaft assembly 33 as a tertiary transmission mechanism, wherein in this example, the input shaft assembly 31, the intermediate shaft assembly 32 and the output shaft assembly 33 are all gear transmission mechanisms. In the present invention, the reduction mechanism assembly 3 also includes an idler mechanism 34, wherein the idler mechanism 34 is arranged between the input shaft assembly 31 and the intermediate shaft assembly 32, the output shaft assembly is connected to the left wheel 200 through the disengagement mechanism 4, and the idler mechanism 34 is installed on the housing assembly 5 of the dual-motor drive system through a bearing assembly 8. Among them, the resolver assembly is mainly used to convert the electrical energy corresponding to the power battery into mechanical energy output by the motor assembly through rotational motion. The three-stage transmission mechanism in the reduction mechanism assembly is mainly used to transmit the torque from the motor assembly to the wheels on the corresponding side according to the set transmission ratio. The idler mechanism in the reduction mechanism assembly is used to adjust the center distance. The disengagement mechanism can realize the disengagement of the half-axle of the wheel, thereby effectively reducing the loss caused by the wheel dragging the motor assembly, and is expected to increase the vehicle's cruising range.

[0074] In the dual-motor drive system of the present invention, the idler gear mechanism 34 plays a role in expanding the primary center distance. On this basis, it is expected that the intermediate shaft assembly and the motor assembly 1 can be designed in parallel, thereby reducing the axial size of the dual-motor drive system. Specifically, assuming that the center distance is limited, the motor connected to the primary transmission mechanism and the secondary transmission mechanism need to be axially staggered, which will inevitably lengthen the axial length of the dual-motor drive system.

[0075] Continue to refer to Figure 4In a possible embodiment, the bearing assembly 8 is arranged on the inner side of the idler mechanism in the circumferential direction. Specifically, the housing assembly 5 has a support portion (support seat of the bearing assembly) 51 extending into the inner side of the idler mechanism in the circumferential direction, so that: the idler mechanism 34 cooperates with the outer ring 81 of the bearing assembly 8, and the support portion 51 of the housing assembly 5 cooperates with the inner ring 82 of the bearing assembly 8. Such an arrangement can achieve the compactness of the bearing connection between the housing assembly and the idler mechanism, and thus effectively avoid the problem of difficult or even impossible layout due to the large size of the bearing assembly. Moreover, such an arrangement can effectively avoid the problem of interference between the bearing connection between the idler mechanism and the housing assembly and the bearing connection between the input shaft assembly and the housing assembly, thereby ensuring the reliability of the layout of the dual-motor drive system on the vehicle.

[0076] In a possible implementation, an integrated design of an integral structure disengagement mechanism can be used to increase the product integration of the dual-motor drive system, thereby being able to reduce the Y-direction space of the dual-motor drive system to a certain extent. On this basis, the Y-direction space of the dual-motor drive system can be further reduced by integrating the disengagement mechanism with the planetary gear transmission mechanism 32 to a certain extent. Exemplarily, the disengagement mechanism is connected to the planet carrier of the planetary gear transmission mechanism 32 via a spline.

[0077] Continue to refer to Figure 3 In a possible implementation, the motor housings and motor end covers 11 of the two motor assemblies 1 are both included in the housing assembly 5 of the dual-motor drive system, and the dual-motor drive system 100 further includes an integrated control system (PEU) assembly 6 and an oil cooling system assembly 7. Among them, at least a part of the oil cooling system assembly can be integrated and arranged in the housing assembly 5, thereby realizing the compactness of the product based on the integrated design.

[0078] In a possible embodiment, the oil cooling system assembly 7 includes an oil channel assembly (not shown) that allows oil to circulate to achieve cooling, a filter press 72 that can filter the oil, an oil pump assembly 73, and a cooler assembly 74. In this example, the oil channel assembly can be designed to be integrated and placed in a housing assembly, and the filter press can be integrated into the interior of the housing assembly. In addition, the filter press 72, the oil pump assembly 73, and the cooler assembly 74 can be fixed to the housing assembly of the dual-motor drive system. In addition, the aforementioned PEU assembly 6 is also fixed to the housing assembly of the dual-motor drive system to expand design and development. For example, the components can be fixed to the corresponding positions of the housing assembly with the aid of fasteners such as bolts.

[0079] Main reference Figure 5As an alternative embodiment, the filter press can be integrated into the interior of the housing assembly. For example, one achievable method is that the filter press includes an effective filtering component such as filter paper 721, and a storage space that can reliably and stably accommodate the filter paper can be constructed in the housing assembly 5 to realize the built-in integrated design of the filter press. Exemplarily, an intermediate housing 52 is added to the housing assembly 5, and a storage space 521 corresponding to the filter paper is constructed by the cooperation of the intermediate housing and the housing assembly. In the case where the filter press is integrated into the interior of the housing assembly of the dual-motor drive system, there is no need to configure a shell for the filter press. In this way, there is no need to arrange the assembly process of the filter press separately, but only the functional structure in the filter press - the filter paper, needs to be placed in the storage space (such as the storage hole) corresponding to the filter paper, which simplifies the process under the premise of the structure being integrated.

[0080] Moreover, compared with the case where the filter press is external, since there is high-pressure oil inside the housing assembly itself, the sealing requirements of the built-in structure are not as stringent as those of the case where the filter press is external. Therefore, the built-in integrated filter press can effectively reduce the probability of oil cooling performance degradation or even failure and reduce the maintenance cost of the oil cooling system assembly.

[0081] In a specific embodiment, the stator 12 of the motor assembly is interference fit with the housing assembly 5, and the manufacturing process is relatively simple and feasible. The input shaft assembly, the output shaft assembly and the intermediate shaft assembly in the speed reduction mechanism assembly 3 are all installed in the corresponding positions in the housing assembly 5 by means of bearing connection. The oil channel assembly of the oil cooling system assembly 7 is integrated in the housing assembly, and the risk of oil channel leakage is reduced due to the small number of oil channels leaking out. For example, the integrated design of the oil channel in the housing assembly can be achieved by a die-casting process.

[0082] Main reference Figure 6 In a possible implementation, the motor shaft 13 (hollow shaft) of the motor assembly 1 is provided with an axial current diversion structure 9, which mainly includes a conductive ring 91 and a junction box 92, and the axial current from the motor shaft 13 can be conducted to the junction box 92 via the conductive ring 91.

[0083] In a possible implementation, the conductive ring 91 includes a conductive ring body and a conductive medium attached to the conductive ring body. In this example, by press-fitting the conductive ring onto the box cover 921 of the junction box 92 with an interference fit, the risk of the conductive ring falling off due to high-speed rotation of the motor shaft can be effectively reduced.

[0084] In a possible implementation manner, a plug 93 is disposed inside the motor shaft 13. Figure 5In the orientation, the plug 93 seals the oil in the oil cooling system assembly 7 in the left area of ​​the hollow shaft and constructs a right area (shaft current drainage area 94) for preventing electrical corrosion through the box cover 921 of the junction box 92.

[0085] By setting the plug 93, the oil of the oil cooling system assembly in the left area can be effectively blocked from entering the shaft current drainage area 94 corresponding to the conductive ring 91, thereby ensuring the reliability of the shaft current drainage. On this basis, in a possible embodiment, an oil drain groove 95 as an oil drain connection structure is provided at a position of the motor shaft 13 corresponding to the shaft current drainage area 94, so that when the oil still enters the shaft current drainage area 94, the oil can be thrown out through the oil drain groove by means of the high-speed rotation of the motor shaft 13, thereby effectively avoiding the phenomenon of oil entering and accumulating in the shaft current drainage area 94, and thus further improving the reliability of the shaft current drainage.

[0086] It can be seen that in the preferred embodiment of the present invention, the dual-motor drive system effectively compresses the Y-direction (vehicle width) dimension of the dual-motor drive system without reducing the assembly performance, so it can better meet the needs of the vehicle architecture that has requirements for the Y-direction dimension. Specifically:

[0087] 1. In the dual-motor drive system of the present invention, the reduction mechanism assembly adopts a gear transmission mechanism, which can reduce the spacing between the output ends of the half-axles, which is conducive to meeting the high vibration requirements of the whole vehicle for the half-axles, such as being particularly suitable for off-road vehicles, pickup trucks and other vehicles with high passability requirements.

[0088] On the basis of adopting the traditional gear transmission mechanism, by adding an idler gear mechanism, the primary center distance is expanded, so that it is possible to arrange the components (gears or shafts) in the secondary transmission mechanism in parallel with the components in the primary transmission mechanism or the motor assembly connected to the primary transmission mechanism, thereby effectively compressing the axial size.

[0089] 2. The shaft current drainage structure of the present invention adopts a conductive ring to reduce the shaft current risk of the high-voltage platform, wherein the conductive medium of the conductive ring is arranged on the outside of the conductive ring body and installed on the cover of the junction box, which can effectively avoid the problem of the conductive ring falling off due to reasons such as high-speed driving of the vehicle and further causing the shaft current extraction failure. At the same time, by processing the oil drain hole on the motor shaft, the oil that is not blocked by the plug can be timely discharged, thereby avoiding the problem of the conductive effect of the conductive ring being affected by the oil entering the corresponding conductive ring area.

[0090] 3. The two motor assemblies and the two reduction mechanism assemblies corresponding to the two motor assemblies in the dual motor drive system of the present invention share a set of independent oil cooling system assemblies to achieve corresponding cooling and lubrication, thereby effectively reducing the loss of the motor drive system assembly caused by high temperature. On this basis, the number of parts of the oil cooling system assembly is reduced while achieving product compactness and ensuring cooling / lubrication effects, thereby reducing the product manufacturing cost of the dual motor drive system.

[0091] In addition, the dual-motor drive system of the present invention is often used in a four-wheel drive time-sharing vehicle platform, which can effectively reduce the product cost of the platform development of the motor drive assembly. For example, the dual-motor drive system of the present invention can adopt a common platform structure to realize the front / rear drive wheel common motor system and speed reduction mechanism assembly, and the disengagement mechanism can be configured as an option, and the platform development of the dual-motor drive system can be realized by adaptively adjusting the control system.

[0092] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A motor drive system for a vehicle, characterized in that: The motor drive system comprises: Motor assembly; and A reduction mechanism assembly, wherein the motor assembly can be connected to the wheels of the vehicle through the reduction mechanism assembly; Wherein, the reduction mechanism assembly comprises a multi-stage transmission mechanism, and an idler gear mechanism is arranged between at least one pair of adjacent transmission mechanisms in the multi-stage transmission mechanism.

2. The motor drive system according to claim 1, characterized in that: The speed reduction mechanism assembly comprises an input shaft assembly, and the idler gear mechanism is drivingly connected to the input shaft assembly.

3. The motor drive system according to claim 1, characterized in that: The speed reduction mechanism assembly comprises an input shaft assembly, an output shaft assembly and an intermediate shaft assembly arranged therebetween, and the idler gear mechanism is arranged between the input shaft assembly and the intermediate shaft assembly.

4. The motor drive system according to claim 1, characterized in that: The motor drive system comprises a housing assembly, and the idler gear mechanism is arranged on the housing assembly via a bearing assembly.

5. The motor drive system according to claim 4, characterized in that: The idler mechanism includes an idler, the housing assembly includes a support portion extending into the idler, the inner ring of the bearing assembly cooperates with the support portion, and the outer ring of the bearing assembly cooperates with the idler.

6. The motor drive system according to claim 5, characterized in that: The motor drive system includes an oil cooling system assembly, and the oil cooling system assembly includes an oil passage assembly. At least a portion of the oil passage assembly is integrated inside the housing assembly.

7. The motor drive system according to claim 6, characterized in that: The motor drive system includes a pressure filter and / or an oil pump assembly and / or a cooler assembly, and the oil pump assembly and / or the cooler assembly are arranged on the housing assembly.

8. The motor drive system according to claim 1, characterized in that: The vehicle includes a disengagement mechanism disposed between the motor drive system and the wheels, Wherein, the disengagement mechanism is an integrated structure; and / or The disengagement mechanism is integrated with the speed reduction mechanism assembly.

9. The motor drive system according to any one of claims 1 to 8, characterized in that: The motor assembly includes a motor shaft, and the motor shaft is provided with a shaft current diversion structure. Wherein, the shaft current diversion structure includes a conductive ring and a junction box, and the motor shaft can be electrically connected to the junction box via the conductive ring.

10. The motor drive system according to claim 9, characterized in that: The junction box comprises a cover body, and the conductive ring is arranged on the cover body in an interference fit manner.

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