Dual-motor power unit and vehicle

Abstract

The invention relates to the technical field of vehicle manufacturing, and discloses a dual-motor power unit and a vehicle, the dual-motor power unit comprises two sets of power assemblies, the two sets of power assemblies are symmetrically arranged about a plane, each power assembly comprises a driving motor and a transmission system, the driving motor comprises a motor shaft, a rotor, a stator iron core and a stator winding, the motor shaft is fixedly connected with the rotor, the motor shaft is in transmission connection with the transmission system, the transmission system is used for being in transmission connection with a wheel shaft of a vehicle, the axis of the motor shaft is perpendicular to the plane, and the stator iron core and the stator winding are overlapped with the transmission system in the axis direction of the motor shaft. According to the dual-motor power unit and the vehicle, the problems that an existing dual-motor power unit is large in occupied space, and arrangement of the dual-motor power unit in the whole vehicle is not facilitated can be solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle manufacturing technology, and in particular to a dual-motor power unit and a vehicle. Background Art

[0002] As an important part of the vehicle, the powertrain of the dual-motor power unit has a certain impact on the vehicle's power, endurance, and ride comfort. The powertrain generally includes a motor and a transmission system. The motor is connected to the vehicle's wheel axle through the transmission system. The transmission system mainly includes a planetary gear transmission scheme and a fixed-axis gear transmission scheme.

[0003] Among them, the input shaft of the planetary gear transmission scheme is coaxial with the motor shaft, and mainly uses NGW (Internalmeshing, Common planetary gear for internal and external meshing, Externalmeshing, internal meshing, internal and external meshing common planetary gear, external meshing) type and NW (Internal meshing, Externalmeshing, internal meshing, external meshing) type planetary gear transmission mechanisms, which have complex structures, great manufacturing difficulties, high costs, low precision, poor NVH (Noise, Vibration, Harshness) performance, and low transmission efficiency. Therefore, fixed-axis gear transmission schemes are currently mostly used.

[0004] Existing fixed-axis gear transmission solutions include two categories: the input shaft and the motor shaft are coaxial or non-coaxial. Although they have a simple structure, mature technology, low cost, and good NVH performance at high speeds (input speed ≥ 20,000 rpm), they occupy a large space and are not conducive to the layout of the powertrain in the vehicle. Summary of the invention

[0005] The present application provides a dual-motor power unit and a vehicle, which can improve the problem that the existing dual-motor power unit occupies a large space, which is not conducive to the arrangement of the dual-motor power unit in the vehicle.

[0006] In a first aspect, an embodiment of the present application provides a dual-motor power unit, including a power assembly, wherein the power assembly is arranged in two groups, and the two groups of the power assemblies are symmetrically arranged about a plane, the power assembly includes a drive motor and a transmission system, the drive motor includes a motor shaft, a rotor, a stator core and a stator winding, the motor shaft is fixedly connected to the rotor, the motor shaft is transmission-connected to the transmission system, the transmission system is used for transmission connection with the wheel axle of a vehicle, the axis of the motor shaft is perpendicular to the plane, and the stator core and the stator winding have overlapping parts with the transmission system in the axial direction of the motor shaft.

[0007] In some of these embodiments, the drive system includes a first drive assembly and a second drive assembly that are drivingly connected. The first drive assembly is drivingly connected to the motor shaft. The stator core and the stator winding both have an overlapping portion with the second drive assembly in the axial direction of the motor shaft. The second drive assembly is configured to be drivingly connected to the wheel axle.

[0008] In some of these embodiments, the first drive assembly includes a first driving member and a first driven member that are drivingly connected. The first driving member is drivingly connected to the motor shaft. The second drive assembly includes a second driving member and a second driven member that are drivingly connected. The second driving member is drivingly connected to the first driven member. The stator core and the stator winding both have an overlapping portion with the second driving member in the axial direction of the motor shaft. The second driven member is configured to be drivingly connected to the wheel axle.

[0009] In some of these embodiments, the second driving member and the first driven member are coaxially arranged.

[0010] In some of these embodiments, the drive system includes an intermediate shaft. The axis of the intermediate shaft is parallel to the axis of the motor shaft. The second driving member and the first driven member are both coaxially arranged with the intermediate shaft and are both fixedly connected to the intermediate shaft.

[0011] In some of these embodiments, the first driving member includes a first driving gear, and the first driven member includes a first driven gear. The first driving gear and the first driven gear mesh with each other. The second driving member includes a second driving gear, and the second driven member includes a second driven gear. The second driving gear and the second driven gear mesh with each other. The first driven gear and the second driving gear are coaxially arranged. The diameter of the first driven gear is larger than the diameter of the second driving gear and larger than the diameter of the second driven gear.

[0012] In some of these embodiments, the drive system includes a first support bearing. The intermediate shaft passes through the first support bearing. The first support bearing is provided on one or both sides of the first driven member.

[0013] In some of these embodiments, the transmission system includes a second support bearing through which the intermediate shaft passes. The second support bearing is disposed on a side of the second driving member facing away from the first driven member. The intermediate shaft passes through the second support bearing, and the second support bearing is arranged in cooperation with the intermediate shaft. Both the stator core and the stator winding coincide with the second support bearing in the axial direction of the motor shaft, and a part of the intermediate shaft coincides with the drive motor in the axial direction of the motor shaft.

[0014] In some of these embodiments, the motor shaft includes a first part and a second part respectively located on both sides of the rotor. The transmission system is drivingly connected to the first part. The transmission system includes a power support bearing through which the second part passes and is arranged in cooperation with the power support bearing.

[0015] In a second aspect, an embodiment of the present application provides a vehicle, including two sets of axles and the dual-motor power unit as described in the first aspect. The transmission system of one set of the power assemblies is drivingly connected to one set of the axles, and the transmission system of the other set of the power assemblies is drivingly connected to the other set of the axles.

[0016] The beneficial effects of the dual-motor power unit provided by the embodiments of the present application are as follows: Since the drive motor includes a motor shaft, the transmission system is drivingly connected to the motor shaft, and both the stator core and the stator winding have overlapping parts with the transmission system in the axial direction of the motor shaft, it is possible to make the space occupied by the power assembly in the axial direction of the motor shaft smaller, thereby improving the problem that the existing dual-motor power unit occupies a large space and is not conducive to the layout of the dual-motor power unit in the vehicle.

[0017] The beneficial effects of the vehicle provided by the present application compared with the prior art can be referred to the beneficial effects of the dual-motor power unit provided by the present application compared with the prior art, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram of a dual-motor power unit in one of the embodiments of the present application;

[0020] Figure 2 is Figure 1Schematic structural diagram of the first transmission assembly and the second transmission assembly in the shown dual-motor power unit;

[0021] Figure 3 is Figure 1 Schematic diagram of the transmission principle of the shown dual-motor power unit;

[0022] Figure 4 Schematic structural diagram of the dual-motor power unit in another embodiment of the present application.

[0023] The meanings of the marks in the figure are as follows:

[0024] 10. Driving motor; 101. Motor shaft; 1011. First part; 1012. Second part; 11. Stator; 12. Rotor; 20. First driving part; 30. First driven part; 40. Second driving part; 50. Second driven part; 60. Intermediate shaft; 61. First support bearing; 62. Second support bearing; 70. Input shaft; 71. Input support bearing; 80. Output shaft; 81. Output support bearing; 90. Power support bearing. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0028] References to "one embodiment", "some embodiments", or "an embodiment" in the description of the present application mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc., which appear in different places in this specification, are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. In addition, in one or more embodiments, specific features, structures, or characteristics may be combined in any suitable manner.

[0029] To illustrate the technical solutions of the present application, the following will be described in conjunction with specific drawings and embodiments.

[0030] As an important component of a vehicle, the powertrain of a dual-motor power unit has a certain impact on aspects such as the power, endurance, and ride comfort of the vehicle. The dual-motor power unit generally includes a motor and a transmission system. The motor is drivingly connected to the vehicle's axle through the transmission system. The transmission system mainly has a planetary gear transmission scheme and a fixed-axis gear transmission scheme.

[0031] Among them, the input shaft of the planetary gear transmission scheme is coaxial with the motor shaft, and mainly uses NGW-type and NW-type planetary gear transmission mechanisms. It has a complex structure, high manufacturing difficulty, high cost, low precision, poor NVH performance, and low transmission efficiency. Therefore, at present, the fixed-axis gear transmission scheme is mostly adopted.

[0032] The existing fixed-axis gear transmission schemes are divided into two categories: the input shaft is coaxial or non-coaxial with the motor shaft. Although they have a simple structure, mature technology, low cost, and good NVH performance at high speeds (input speed ≥ 20,000 rpm), they occupy a relatively large space, which is not conducive to the layout of the dual-motor power unit in the vehicle.

[0033] In view of this, the present application provides a dual-motor power unit and a vehicle. Since the driving motor includes a motor shaft, the transmission system is drivingly connected to the motor shaft, and both the stator core and the stator winding have an overlapping part with the transmission system in the axial direction of the motor shaft, it is possible to make the space occupied by the powertrain in the axial direction of the motor shaft smaller, and it can improve the problem that the existing dual-motor power unit occupies a relatively large space and is not conducive to the layout of the dual-motor power unit in the vehicle.

[0034] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 which is a schematic structural diagram of the dual-motor power unit in one embodiment of the present application, Figure 2 is Figure 1Schematic structural diagram of the first transmission assembly and the second transmission assembly in the dual-motor power unit shown Figure 3 is Figure 1 Schematic diagram of the transmission principle of the dual-motor power unit shown

[0035] In a first aspect, an embodiment of the present application provides a dual-motor power unit, which can be used in a vehicle. The dual-motor power unit can be connected to the chassis of the vehicle. The dual-motor power unit includes a power assembly. There are two sets of power assemblies, which are symmetrically arranged about a plane O. The power assembly includes a drive motor 10 and a transmission system

[0036] The dual-motor power unit includes a drive motor 10 and a transmission system

[0037] The drive motor 10 includes a motor shaft 101, a stator 11, and a rotor 12. The stator 11 includes a stator core and a stator winding. The motor shaft 101 is fixedly connected to the rotor 12. The motor shaft 101 is in transmission connection with the transmission system. The transmission system is used for transmission connection with the axle of the vehicle. The axis of the motor shaft 101 is perpendicular to the plane O

[0038] The transmission system and the motor shaft 101 can be in transmission connection through mechanisms such as gears, racks, chains, belts, couplings, or cam linkages. The axle of the vehicle can be the half axle of the vehicle. After the power of the drive motor 10 is transmitted to the half axle, the vehicle is driven

[0039] Both the stator core and the stator winding have an overlapping part with the transmission system in the axial direction of the motor shaft 101, that is, the stator core has an overlapping part with the transmission system in the axial direction of the motor shaft 101, the stator winding has an overlapping part with the transmission system in the axial direction of the motor shaft 101, and both the stator core and the stator winding have an overlapping part with the transmission system in the axial direction of the motor shaft 101. The overlapping part is Figure 1 shown by the dashed rectangular box in

[0040] Since both the stator core and the stator winding have an overlapping part with the transmission system in the axial direction of the motor shaft 101, the total size of the power assembly in the axial direction of the motor shaft 101 can be reduced. Therefore, the space occupied by the dual-motor power unit in the axial direction of the motor shaft 101 can be made smaller, which is convenient for layout in the whole vehicle

[0041] For example, in the embodiments shown in Figure 1 shown and Figure 3 shown, the axial direction of the motor shaft 101 is along the left-right direction. The left-right direction can be the width direction of the vehicle. Then both the stator core and the stator winding have an overlapping part with the transmission system in the left-right direction. The total size (lateral size) of the power assembly in the left-right direction is smaller. Therefore, the space occupied by the dual-motor power unit in the axial direction of the motor shaft 101 can be made smaller

[0042] From the above, it can be seen that the dual-motor power unit provided in the embodiment of the present application, since the drive motor 10 includes a motor shaft 101, the transmission system is connected to the motor shaft 101, and the stator core and the stator winding have overlapping parts with the transmission system in the axial direction of the motor shaft 101, so the space occupied by the power assembly in the axial direction of the motor shaft 101 can be smaller, thereby improving the problem that the existing dual-motor power unit occupies a large space, which is not conducive to the layout of the dual-motor power unit in the vehicle.

[0043] Among them, the transmission system includes a first transmission component and a second transmission component that are transmission-connected. The first transmission component is transmission-connected to the motor shaft 101. The stator core and the stator winding have overlapping parts with the second transmission component in the axial direction of the motor shaft 101. The second transmission component is used for transmission connection with the wheel axle.

[0044] By adopting the above solution, the relative positions of the motor shaft 101 and the wheel axle of the vehicle can be flexibly and conveniently arranged using the first transmission assembly and the second transmission assembly in transmission connection.

[0045] For example, the first transmission assembly and the second transmission assembly can be connected to each other through a mechanism such as a gear, a rack, a chain, a belt or a cam connecting rod.

[0046] Please refer to Figure 1 , Figure 2 and Figure 3 In this embodiment, the first transmission assembly includes a first active member 20 and a first driven member 30 which are transmission-connected, and the first active member 20 is transmission-connected to the motor shaft 101; the second transmission assembly includes a second active member 40 and a second driven member 50 which are transmission-connected, and the second active member 40 is transmission-connected to the first driven member 30, and the stator core and the stator winding have overlapping parts with the second active member 40 in the axial direction of the motor shaft 101, and the second driven member 50 is used for transmission connection with the wheel axle.

[0047] By adopting the above solution, the relative positions of the motor shaft 101 and the wheel axle of the vehicle can be arranged more flexibly and conveniently using the first active member 20, the first driven member 30, the second active member 40 and the second driven member 50 which are transmission-connected.

[0048] It should be noted that the first active member 20 and the first driven member 30 can be connected by gears, racks, chains, belts or cam links. The second active member 40 and the first driven member 30 can be connected by gears, racks, chains, belts or cam links. The second active member 40 and the second driven member 50 can be connected by gears, racks, chains, belts or cam links.

[0049] For example, the first active member 20 , the first driven member 30 , the second active member 40 , and the second driven member 50 may all be configured as gears or may all be configured as pulleys.

[0050] Optionally, the second active member 40 is coaxially arranged with the first driven member 30 .

[0051] Such an arrangement facilitates the control of the installation accuracy of the second active member 40 and the first driven member 30 , thereby facilitating the arrangement of the relative positions of the second active member 40 and the first driven member 30 .

[0052] For example, the second active member 40 and the first driven member 30 can both be configured as gears or pulleys.

[0053] As one method that can be implemented, the transmission system includes an intermediate shaft 60, the axis of the intermediate shaft 60 is arranged parallel to the axis of the motor shaft 101, the second active member 40 and the first driven member 30 are both coaxially arranged with the intermediate shaft 60, and the second active member 40 and the first driven member 30 are both fixedly connected to the intermediate shaft 60.

[0054] With such arrangement, the second active member 40 and the first driven member 30 only need to be fixedly connected to the intermediate shaft 60 , so that the second active member 40 and the first driven member 30 can be coaxially arranged, and the installation process is simple and convenient.

[0055] It is understandable that both the second active member 40 and the first driven member 30 can achieve synchronous rotation with the intermediate shaft 60 through a spline connection, thereby achieving power transmission inside the intermediate shaft 60 .

[0056] Please refer to Figure 1 , Figure 2 and Figure 3 In this embodiment, the first driving member 20 includes a first driving gear, the first driven member 30 includes a first driven gear, the first driving gear and the first driven gear are meshed with each other; the second driving member 40 includes a second driving gear, the second driven member 50 includes a second driven gear, the second driving gear and the second driven gear are meshed with each other, the first driven gear is coaxially arranged with the second driving gear, and the diameter of the first driven gear is greater than the diameter of the second driving gear and greater than the diameter of the second driven gear.

[0057] By adopting the above scheme, the transmission between the first active member 20 and the first driven member 30 and between the second active member 40 and the second driven member 50 can be smooth and efficient, and the structure is compact, the volume is small, and the space occupied is small. At the same time, the stator core and the stator winding can have overlapping parts with the second active member 40 in the axial direction of the motor shaft 101.

[0058] Among them, the transmission system includes a first support bearing 61, the intermediate shaft 60 is disposed through the first support bearing 61, and the first support bearing 61 is disposed on one or both sides of the first driven member 30.

[0059] With such an arrangement, the intermediate shaft 60 can be stably supported on one or both sides of the first driven member 30 through the first support bearing 61, effectively avoiding the shaking of the intermediate shaft 60 during rotation.

[0060] It can be understood that the first support bearing 61 can also be connected to the vehicle chassis to enable the intermediate shaft 60 to rotate relative to the chassis.

[0061] As an implementable way, two first support bearings 61 are provided, and one of the first support bearings 61 is disposed between the first driven member 30 and the second driving member 40, and the other first support bearing 61 is disposed on the side of the first driven member 30 away from the second driving member 40.

[0062] With such an arrangement, the intermediate shaft 60 can be supported more stably, effectively avoiding the shaking of the intermediate shaft 60 during rotation.

[0063] Optionally, the first support bearing 61 is a tapered roller bearing, and the two first support bearings 61 are disposed opposite to or away from each other.

[0064] With such an arrangement, the load-bearing capacity of the first support bearing 61 can be relatively strong, and the support is more stable.

[0065] In this embodiment, the two first support bearings 61 are disposed away from each other.

[0066] Optionally, the transmission system includes a second support bearing 62, the intermediate shaft 60 of the transmission system is disposed through the second support bearing 62, the second support bearing 62 is disposed on the side of the second driving member 40 away from the first driven member 30, the intermediate shaft 60 is disposed through the second support bearing 62, and the second support bearing 62 is arranged in cooperation with the intermediate shaft 60. The stator core and the stator winding are both coincident with the second support bearing 62 in the axial direction of the motor shaft 101, and part of the intermediate shaft 60 and the drive motor 10 are coincident in the axial direction of the motor shaft 101.

[0067] With such an arrangement, the intermediate shaft 60 can be stably supported on the side of the second driving member 40 away from the first driven member 30, improving the support stiffness of the intermediate shaft 60, and effectively avoiding the shaking of the intermediate shaft 60 during rotation.

[0068] Among them, the second support bearing 62 is a needle roller bearing or a cylindrical roller bearing.

[0069] With such an arrangement, the radial dimension of the second support bearing 62 can be relatively small, so that the occupied space is relatively small.

[0070] It should be noted that, in order to avoid interference with the stator 11, the traditional intermediate shaft 60 and the stator 11 do not overlap in the axial direction of the motor shaft 101, resulting in a large space occupied by the dual-motor power unit in this direction. In the embodiment of the present application, according to the characteristic that the diameter of the second driving member 40 is small, it can be arranged in the external space of the stator 11, and at the same time, a second support bearing 62 is added to improve the support stiffness of the intermediate shaft 60, so that the intermediate shaft 60 and the stator 11 partially overlap in the axial direction of the motor shaft 101, achieving the purpose of reducing the space occupied in the axial direction of the motor shaft 101.

[0071] Please refer to Figure 1 、 Figure 2 and Figure 3 , in this embodiment, the first driving member 20 is coaxially arranged with the motor shaft 101.

[0072] By adopting the above scheme, it is convenient to control the installation accuracy of the first driving member 20 and the motor shaft 101, and thus it is convenient to arrange the relative positions of the first driving member 20 and the motor shaft 101.

[0073] Among them, the transmission system includes an input shaft 70. The first driving member 20 is coaxially arranged with and fixedly connected to the input shaft 70, and the input shaft 70 is coaxially arranged with and drivingly connected to the motor shaft 101.

[0074] With such a setting, as long as the first driving member 20 is coaxially arranged with and fixedly connected to the input shaft 70, the first driving member 20 can be coaxially arranged with the motor shaft 101, and the installation process is simple and convenient.

[0075] Exemplarily, the input shaft 70 and the motor shaft 101 can be coaxially arranged and drivingly connected by a coupling or a spline or the like.

[0076] Optionally, the transmission system includes an input support bearing 71. The input shaft 70 passes through the input support bearing 71, and the input support bearing 71 is arranged in cooperation with the input shaft 70. The input support bearing 71 is arranged on one side or both sides of the first driving member 20.

[0077] With such a setting, the input shaft 70 can be stably supported, effectively avoiding the input shaft 70 from shaking during rotation.

[0078] It can be understood that the input support bearing 71 can also be connected to the vehicle chassis to enable the input shaft 70 to rotate relative to the chassis.

[0079] It should be noted that two input support bearings 71 can be provided, and the two input support bearings 71 are respectively arranged on both sides of the first driving member 20 to more stably support the input shaft 70.

[0080] Please refer toFigure 1 , Figure 2 and Figure 3 , in this embodiment, the transmission system includes an output shaft 80, the axis of the output shaft 80 is arranged parallel to the axis of the motor shaft 101, the second driven member 50 is coaxially arranged with and fixedly connected to the output shaft 80, and the output shaft 80 is used for driving connection with the axle of the vehicle.

[0081] By adopting the above solution, it is convenient to control the installation accuracy of the second driven member 50 and the axle of the vehicle, so as to facilitate arranging the relative position of the second driven member 50 and the axle of the vehicle.

[0082] Exemplarily, the output shaft 80 and the axle of the vehicle can be coaxially arranged and drivingly connected through a coupling or a spline or the like.

[0083] Optionally, the transmission system includes an output support bearing 81, the output shaft 80 passes through the output support bearing 81, and the output support bearing 81 is arranged in cooperation with the output shaft 80, and the output support bearing 81 is arranged on one side or both sides of the second driven member 50.

[0084] With such an arrangement, the output shaft 80 can be stably supported, effectively avoiding the shaking of the input shaft 70 during rotation.

[0085] It can be understood that the output support bearing 81 can also be connected to the vehicle chassis to enable the output shaft 80 to rotate relative to the chassis.

[0086] It should be noted that two output support bearings 81 can be provided and the two output support bearings 81 are respectively arranged on both sides of the second driven member 50 to more stably support the output shaft 80.

[0087] Please refer to Figure 1 , Figure 2 and Figure 3 , in this embodiment, the motor shaft 101 includes a first part 1011 and a second part 1012 respectively located on both sides of the rotor 12, and the transmission system is drivingly connected to the first part 1011; the transmission system includes a power support bearing 90, and the second part 1012 passes through the power support bearing 90 and is arranged in cooperation with the power support bearing 90.

[0088] By adopting the above solution, the second part 1012 can be stably supported by the power support bearing 90, effectively avoiding the shaking of the second part 1012 during the rotation of the rotor 12.

[0089] It can be understood that the first part 1011 can be drivingly connected to the input shaft 70.

[0090] It can be understood that the two drive motors 10 in the dual-motor power unit provided by the embodiments of the present application can be respectively arranged on the left and right sides of the vehicle, and the two drive systems are respectively installed between the two drive motors 10 on the left and right sides, realizing the dual-motor power drive of the vehicle.

[0091] Exemplarily, the two sets of power assemblies are respectively arranged on the left and right sides of the vehicle and are symmetrically arranged left and right. The motor shaft 101 of the drive motor 10 of the power assembly on the left side is in transmission connection with the drive system, and the drive system is in transmission connection with the left wheel axle to drive the left wheel. The motor shaft 101 of the drive motor 10 of the power assembly on the right side is in transmission connection with the drive system, and the drive system is in transmission connection with the right wheel axle to drive the right wheel. The motor shafts 101 of the drive motors 10 of the two sets of power assemblies are coaxially arranged.

[0092] Among them, the center distance D1 between the first driving gear and the first driven gear is relatively large, and the center distance D2 between the second driving gear and the second driven gear is relatively small. The stator cores and stator windings of the left and right drive motors 10 are respectively moved into the length spaces of the left and right intermediate shafts 60, so that the stator cores and stator windings of the drive motors 10 partially overlap with the intermediate shafts 60 in the axial direction of the motor shaft 101, reducing the overall vehicle transverse dimension of the dual-motor power unit. While achieving a very small axial dimension of the dual-motor power unit, a two-stage fixed-axis gear transmission is still adopted, presenting a two-stage fixed-axis gear transmission scheme with a compact vehicle transverse space, which has the characteristics of high efficiency, reliability and low cost.

[0093] At the same time, the left and right intermediate shafts 60 of the dual-motor power unit provided by the embodiments of the present application both adopt a novel three-bearing support structure (two first support bearings 61 and one second support bearing 62), ensuring reliability and NVH performance, so that while the dual-motor power unit has a small overall vehicle transverse dimension, it ensures high efficiency, reliability and low cost.

[0094] In addition, the center distance D1 between the first driving gear and the first driven gear is relatively large, and its speed ratio is also larger than that of the conventional design, with stronger load-bearing capacity. Therefore, the speed ratio of the above-mentioned second driving gear and second driven gear is relatively smaller than that of the conventional design, and the center distance D2 between the second driving gear and the second driven gear can also be reduced.

[0095] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the dual-motor power unit in another embodiment of the present application.

[0096] Different from the above embodiment, in another embodiment, the first support bearing 61 includes a tapered roller bearing, and the two first support bearings 61 are oppositely arranged. The stator core and stator winding both have an overlapping part with the drive system in the axial direction of the motor shaft 101, and the overlapping part isFigure 4 as shown by the dashed rectangular box in the figure

[0097] In a second aspect, an embodiment of the present application provides a vehicle, including two sets of axles and a dual-motor power unit as in the first aspect, wherein the transmission system of one set of power assemblies is drivingly connected to one set of axles, and the transmission system of the other set of power assemblies is drivingly connected to the other set of axles.

[0098] In the vehicle provided by the embodiment of the present application, since the drive motor 10 of the dual-motor power unit includes a motor shaft 101, the transmission system is drivingly connected to the motor shaft 101, and both the stator core and the stator winding have an overlapping part with the transmission system in the axial direction of the motor shaft 101, it is possible to make the space occupied by the power assembly in the axial direction of the motor shaft 101 smaller, thereby improving the problem that the existing dual-motor power unit occupies a large space and is not conducive to the layout of the dual-motor power unit in the whole vehicle.

[0099] It can be understood that the vehicle provided by the embodiment of the present application may further include a chassis, wheels, a body, etc. The dual-motor power unit can drive the wheels to rotate, which will not be elaborated here.

[0100] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A dual-motor power unit, characterized in that: The invention comprises a power assembly, wherein two groups of the power assembly are arranged symmetrically about a plane, wherein the power assembly comprises a drive motor and a transmission system, wherein the drive motor comprises a motor shaft, a rotor, a stator core and a stator winding, wherein the motor shaft is fixedly connected to the rotor, wherein the motor shaft is transmission-connected to the transmission system, wherein the transmission system is used for transmission-connecting to the wheel axle of the vehicle, wherein the axis of the motor shaft is perpendicular to the plane, and the stator core and the stator winding both have overlapping parts with the transmission system in the axis direction of the motor shaft.

2. The dual-motor power unit according to claim 1, characterized in that: The transmission system includes a first transmission component and a second transmission component that are transmission-connected, the first transmission component is transmission-connected to the motor shaft, the stator core and the stator winding both have overlapping portions with the second transmission component in the axial direction of the motor shaft, and the second transmission component is used for transmission connection to the wheel axle.

3. The dual-motor power unit according to claim 2, characterized in that: The first transmission assembly includes a first active member and a first driven member in transmission connection, and the first active member is transmission-connected to the motor shaft; the second transmission assembly includes a second active member and a second driven member in transmission connection, and the second active member is transmission-connected to the first driven member, the stator core and the stator winding both have overlapping portions with the second active member in the axial direction of the motor shaft, and the second driven member is used for transmission connection to the wheel axle.

4. The dual-motor power unit according to claim 3, characterized in that: The second active member is coaxially arranged with the first driven member.

5. The dual-motor power unit according to claim 4, characterized in that: The transmission system comprises an intermediate shaft, the axis of the intermediate shaft is arranged parallel to the axis of the motor shaft, the second driving member and the first driven member are both arranged coaxially with the intermediate shaft, and the second driving member and the first driven member are both fixedly connected to the intermediate shaft.

6. The dual-motor power unit according to claim 5, characterized in that: The first active member includes a first active gear, the first driven member includes a first driven gear, the first active gear and the first driven gear are meshed with each other; the second active member includes a second active gear, the second driven member includes a second driven gear, the second active gear and the second driven gear are meshed with each other, the first driven gear and the second active gear are coaxially arranged, and the diameter of the first driven gear is greater than the diameter of the second active gear and greater than the diameter of the second driven gear.

7. The dual-motor power unit according to claim 5, characterized in that: The transmission system comprises a first support bearing, the intermediate shaft passes through the first support bearing, and the first support bearing is arranged on one side or both sides of the first driven member.

8. The dual-motor power unit according to claim 7, characterized in that: The transmission system includes a second support bearing, the intermediate shaft is passed through the second support bearing, the second support bearing is arranged on the side of the second active member away from the first driven member, the intermediate shaft is passed through the second support bearing, and the second support bearing is matched with the intermediate shaft, the stator core and the stator winding both overlap with the second support bearing in the axial direction of the motor shaft, and part of the intermediate shaft and the drive motor overlap in the axial direction of the motor shaft.

9. The dual-motor power unit according to any one of claims 1 to 8, characterized in that: The motor shaft includes a first part and a second part respectively located on both sides of the rotor, and the transmission system is in transmission connection with the first part; the transmission system includes a power support bearing, and the second part is inserted into the power support bearing and matched with the power support bearing.

10. A vehicle, characterized in that: It comprises two sets of wheel axles and a dual-motor power unit as described in any one of claims 1 to 9, wherein the transmission system of one set of the powertrain is drivingly connected to one set of the wheel axles, and the transmission system of the other set of the powertrain is drivingly connected to the other set of the wheel axles.

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