Power driving system and vehicle

Abstract

The utility model discloses a power driving system and a vehicle. A second wheel axle comprises a first half axle and a second half axle; the first motor is in power connection with the first wheel axle through a first transmission structure so as to drive the first wheel axle to rotate; the second motor is connected with a first motor shaft, the first motor shaft is arranged outside the first half shaft in a sleeving mode, the first motor shaft is in power connection with the first half shaft through a second transmission structure so as to drive the first half shaft to rotate, and the third motor is connected with a second motor shaft, and the second motor shaft is arranged outside the second half shaft in a sleeving mode. The second motor shaft is in power connection with the second half shaft through a third transmission structure so as to drive the second half shaft to rotate. According to the power driving system, flexible and efficient vehicle driving is achieved, oil consumption is reduced, and fuel economy, power performance and controllability of a vehicle are improved; meanwhile, the axial size of the whole rear electric bridge is shortened, the structural compactness is improved, the arrangement space of the whole vehicle can be increased, and the endurance mileage is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle manufacturing, in particular to a power drive system and a vehicle. Background Art

[0002] With the continuous penetration of new energy technologies, more and more automakers are developing their own new energy strategies. Traditional ICE (ICE) vehicles, due to their large displacement, have high fuel consumption and will struggle to meet future fuel consumption regulations. Consequently, various automakers are exploring new energy technology routes for their vehicles. Currently, new energy vehicles on the market fall into three main categories: the first, based on traditional powertrains with minimal modifications, utilizes a P2 architecture; the second, a pure electric vehicle (EV) architecture, often employing high-powered three or four motors; and the third, a hybrid (PHEV) architecture, either with an extended-range or parallel-parallel system. Existing extended-range hybrid architectures suffer from high fuel consumption, a large electric axle axial dimension, and limited space between the front and rear axles, leaving room for improvement. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, it proposes a power drive system that emphasizes pure electric driving, reduces fuel consumption, and improves the vehicle's fuel economy, power performance, and maneuverability. It also shortens the overall axial dimension of the rear electric axle, improving structural compactness, increasing space for the vehicle's battery pack or fuel tank, and extending range.

[0004] According to an embodiment of the present invention, the power drive system includes: a first wheel axle and a second wheel axle, the first wheel axle and the second wheel axle are spaced apart along the longitudinal direction of the vehicle, and the second wheel axle includes a first half-axle and a second half-axle; an engine and a generator, the engine is used to drive the generator to generate electricity; a first motor, the first motor is connected to the first wheel axle through a first transmission structure for driving the first wheel axle to rotate; a second motor and a third motor, the second motor is connected to a first motor shaft, the first motor shaft is sleeved outside the first half-axle, the first motor shaft is connected to the first half-axle through a second transmission structure for driving the first half-axle to rotate, the third motor is connected to a second motor shaft, the second motor shaft is sleeved outside the second half-axle, and the second motor shaft is connected to the second half-axle through a third transmission structure for driving the second half-axle to rotate.

[0005] According to the power drive system of the embodiment of the present invention, three motors are adopted to realize pure electric two-wheel drive and extended-range two-wheel drive functions, thereby realizing flexible and efficient vehicle drive. Compared with the traditional hybrid extended-range hybrid power system, the present invention highlights the pure electric driving function, reduces fuel consumption, and improves the vehicle's fuel economy, power performance and handling; at the same time, the second motor and the third motor are both coaxially arranged with the second wheel axle, and the first motor shaft and the second motor shaft are both sleeved outside the second wheel axle, shortening the overall axial dimension of the rear electric axle, reducing the additional space occupied by the second motor and the third motor, improving the structural compactness, and can increase the layout space of the vehicle battery pack or fuel tank, thereby improving the cruising range, and having better use effect and wider scope of application.

[0006] According to the power drive system of some embodiments of the present invention, the second transmission structure includes a first transmission gear set, the first motor shaft is provided with a first active input gear, the first half shaft is provided with a first active output gear, and the first transmission gear set is respectively engaged with the first active input gear and the first active output gear for transmission;

[0007] And / or, the third transmission structure includes a second transmission gear set, the second motor shaft is provided with a second active input gear, the second half shaft is provided with a second active output gear, and the second transmission gear set is respectively engaged with the second active input gear and the second active output gear for transmission.

[0008] According to the power drive system of some embodiments of the present invention, the first transmission gear set includes a second transmission gear and a third transmission gear arranged coaxially, the second transmission gear is meshed with the first active input gear for transmission, and the third transmission gear is meshed with the first active output gear for transmission;

[0009] And / or, the second transmission gear set includes a fourth transmission gear and a fifth transmission gear arranged coaxially, the fourth transmission gear is meshed with the second active input gear for transmission, and the fifth transmission gear is meshed with the second active output gear for transmission.

[0010] According to the power drive system of some embodiments of the present invention, a first differential is connected between the first half-shaft and the second half-shaft, and the first active output gear and the second active output gear are respectively power-connected to the first differential.

[0011] According to the power drive system of some embodiments of the present invention, the second motor, the first differential and the third motor are spaced apart in sequence along the axial direction of the second wheel axle, and the first motor shaft is located between the second motor and the first differential, and the second motor shaft is located between the third motor and the first differential.

[0012] According to the power drive system of some embodiments of the present invention, along the longitudinal direction of the vehicle, the first transmission gear set and the second transmission gear set are both located between the first wheel axle and the second wheel axle.

[0013] According to the power drive system of some embodiments of the present invention, along the longitudinal direction of the vehicle, the first motor and the first transmission structure are both located between the first wheel axle and the second wheel axle;

[0014] And / or, the first wheel axle is the front wheel axle of the vehicle, and the second wheel axle is the rear wheel axle of the vehicle.

[0015] According to the power drive system of some embodiments of the present invention, the first transmission structure includes a first input shaft, a first intermediate shaft and a first transmission shaft, the first input shaft is provided with a first input gear, the first intermediate shaft is provided with a coaxially distributed first intermediate gear and a first transmission gear, and the first transmission shaft is provided with a first output gear;

[0016] The first input shaft is connected to the first motor power, and the first transmission shaft is connected to the first wheel axle power, the first input gear is meshed with the first intermediate gear for transmission, and the first transmission gear is meshed with the first output gear for transmission.

[0017] The utility model also provides a vehicle.

[0018] The vehicle according to the embodiment of the present invention is provided with any one of the power drive systems described above.

[0019] According to some embodiments of the present invention, in a vehicle, the engine and the generator are installed in a cabin; and / or the first motor and the first transmission structure are located under a floor of the vehicle.

[0020] The advantages of the vehicle and the power drive system compared to the prior art are the same and will not be described in detail here.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 It is a schematic diagram of the principle of a power drive system according to an embodiment of the present utility model.

[0024] Reference numerals:

[0025] Power drive system 100,

[0026] The first wheel axle 1, the second wheel axle 2, the first half-shaft 21, the first active output gear 211, the second half-shaft 22, the second active output gear 221,

[0027] The first motor 3, the second motor 4, the first motor shaft 41, the first driving input gear 411, the third motor 5, the second motor shaft 51, the second driving input gear 511,

[0028] First transmission structure 6, first input shaft 61, first input gear 611, first intermediate shaft 62, first intermediate gear 621, first transmission gear 622, first transmission shaft 63, first output gear 631,

[0029] The second transmission structure 7, the first transmission gear set 71, the second transmission gear 711, the third transmission gear 712,

[0030] The third transmission structure 8, the second transmission gear set 81, the fourth transmission gear 811, the fifth transmission gear 812,

[0031] Second differential 91, first differential 92, front drive shaft 93, front wheels 94, rear wheels 95, intermediate transfer case 96, rear reduction gearbox 97, engine 98, generator 99, synchronizer S1. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] Unless otherwise specified, the front-to-back direction in this application is the longitudinal direction of the vehicle, that is, the X direction; the left-right direction is the lateral direction of the vehicle, that is, the Y direction; and the up-down direction is the vertical direction of the vehicle, that is, the Z direction.

[0036] Reference below Figure 1 The power drive system 100 according to an embodiment of the present invention is described. The power drive system 100 highlights the pure electric driving function, reduces fuel consumption, and improves the vehicle's fuel economy, power performance and handling; at the same time, it shortens the overall axial dimension of the rear electric axle, improves the structural compactness, and can increase the layout space of the vehicle's battery pack or fuel tank, thereby improving the cruising range.

[0037] like Figure 1 As shown, a power drive system 100 according to an embodiment of the present invention includes: a first wheel axle 1, a second wheel axle 2, an engine 98, a generator 99, a first motor 3, a second motor 4 and a third motor 5.

[0038] The first wheel axle 1 and the second wheel axle 2 are used to connect the front and rear wheels to the vehicle body, so that the front and rear wheels can rotate to propel the vehicle forward or backward, ensuring smooth driving of the vehicle. The first wheel axle 1 and the second wheel axle 2 are spaced apart along the longitudinal direction of the vehicle, that is, the first wheel axle 1 and the second wheel axle 2 are spaced apart a certain distance along the front and rear direction of the vehicle, one is located at the front of the vehicle and the other is located at the rear of the vehicle, such as Figure 1 As shown, in this embodiment, the first wheel axle 1 is located at the front of the vehicle, and two front wheels 94 are connected at both ends. The second wheel axle 2 is located at the rear of the vehicle, and two rear wheels 95 are connected at both ends.

[0039] The second wheel axle 2 includes a first half-shaft 21 and a second half-shaft 22. One of the first half-shaft 21 and the second half-shaft 22 can be used to connect the left rear wheel, and the other of the first half-shaft 21 and the second half-shaft 22 can be used to connect the right rear wheel. That is, when the first half-shaft 21 is set on the left side of the vehicle and the second half-shaft 22 is set on the right side of the vehicle, the first half-shaft 21 is used to connect the left rear wheel and the second half-shaft 22 is used to connect the right rear wheel. When the first half-shaft 21 is set on the right side of the vehicle and the second half-shaft 22 is set on the left side of the vehicle, the first half-shaft 21 is used to connect the right rear wheel and the second half-shaft 22 is used to connect the left rear wheel. Figure 1 As shown, in this embodiment, the first half-shaft 21 is used to connect the left rear wheel, and the second half-shaft 22 is used to connect the right rear wheel, and the setting is highly flexible.

[0040] Power drive system 100 also includes an engine 98 and a generator 99. Engine 98 is used to drive generator 99 to generate electricity. That is, engine 98 can serve as a power generation source, providing electrical energy for the entire power drive system 100. Engine 98 and generator 99 together constitute a range extender, generating electricity during range-extended operation. Engine 98 and generator 99 can be matched according to performance requirements to provide electrical energy when the vehicle battery is low or when additional power is needed. In actual design, engine 98 and generator 99 can be located in the engine compartment.

[0041] The first motor 3, the second motor 4 and the third motor 5 are electric drive devices, that is, the first motor 3, the second motor 4 and the third motor 5 are drive motors, which can be driven individually to rotate the first wheel axle 1 or the second wheel axle 2, or can be driven simultaneously to rotate the first wheel axle 1 and the second wheel axle 2 simultaneously.

[0042] Furthermore, the first motor 3 is power-connected to the first wheel axle 1 via the first transmission structure 6 to drive the first wheel axle 1 to rotate. Specifically, the first motor 3 can transmit power to the first wheel axle 1 via the first transmission structure 6, achieving power transmission from the first motor 3 to the first wheel axle 1. This allows the first motor 3 to drive the first wheel axle 1 to rotate, and the first wheel axle 1 can then drive the connected wheel to rotate. This enables electric propulsion of the vehicle, reducing fuel consumption and lowering fuel consumption.

[0043] The second motor 4 is connected to the first motor shaft 41, the first motor shaft 41 is sleeved outside the first half shaft 21, and the first motor shaft 41 is connected to the first half shaft 21 through the second transmission structure 7 for driving the first half shaft 21 to rotate. The third motor 5 is connected to the second motor shaft 51, the second motor shaft 51 is sleeved outside the second half shaft 22, and the second motor shaft 51 is connected to the second half shaft 22 through the third transmission structure 8 for driving the second half shaft 22 to rotate.

[0044] Specifically, the second motor 4 is coaxially arranged with the first half-shaft 21, and the third motor 5 is coaxially arranged with the second half-shaft 22, that is, the second motor 4 and the first half-shaft 21 and the third motor 5 and the second half-shaft 22 are arranged together at the rear of the vehicle along the transverse direction of the vehicle, and the first motor shaft 41 of the second motor 4 is sleeved outside the first half-shaft 21, so that the second motor 4 is sleeved outside the first half-shaft 21 as a whole, and the second motor shaft 51 of the third motor 5 is sleeved outside the second half-shaft 22, so that the second motor 4 is sleeved outside the second half-shaft 22 as a whole. In this way, the overall axial dimension of the rear electric axle can be shortened, the additional space occupied by the second motor 4 and the third motor 5 is reduced, the structural compactness is improved, the layout space of the battery pack or fuel tank of the whole vehicle can be increased, and the cruising range is improved.

[0045] The first motor shaft 41 is power-connected to the first axle 21 via the second transmission structure 7, thereby driving the first axle 21 to rotate. Specifically, the second motor 4 can transmit power to the first axle 21 via the second transmission structure 7, achieving power transmission from the second motor 4 to the first axle 21, allowing the second motor 4 to drive the first axle 21 to rotate, thereby driving the first axle 21 to rotate, and thus the first axle 21 to drive the wheels connected thereto to rotate. The second motor shaft 51 is power-connected to the second axle 22 via the third transmission structure 8, thereby driving the second axle 22 to rotate. Specifically, the third motor 5 can transmit power to the second axle 22 via the third transmission structure 8, thereby achieving power transmission from the third motor 5 to the second axle 22, allowing the third motor 5 to drive the second axle 22 to rotate, thereby driving the wheels connected thereto to rotate. This enables electric propulsion of the vehicle, further reducing fuel consumption and improving fuel consumption.

[0046] Among them, it should be noted that the power drive system 100 of this embodiment has different operating conditions, including pure electric operating conditions (pure electric front-wheel drive operating conditions, pure electric rear-wheel drive operating conditions and pure electric four-wheel drive operating conditions), extended-range operating conditions (extended-range front-wheel drive operating conditions, extended-range rear-wheel drive operating conditions and extended-range four-wheel drive operating conditions), braking energy recovery operating conditions and reversing operating conditions (controlling the first motor 3 to reverse, or controlling the second motor 4 and the third motor 5 to reverse).

[0047] (1) In the pure electric mode, the first motor 3, the second motor 4 and the third motor 5 are driven independently, that is, the first motor 3 is driven alone to rotate the first wheel axle 1, or the second motor 4 and the third motor 5 are driven to rotate the second wheel axle 2, thereby realizing the pure electric front-wheel drive mode or the pure electric rear-wheel drive mode. The first motor 3, the second motor 4 and the third motor 5 can also be driven simultaneously to rotate the first wheel axle 1 and the second wheel axle 2, thereby realizing the pure electric four-wheel drive mode. In this mode, the range extender does not work, and the engine 98 and the generator 99 are in the off state. This mode is suitable for short-distance driving or when the battery is fully charged.

[0048] (2) In the extended-range operating condition, the range extender is started, and the engine 98 drives the generator 99 to generate electricity. The range extender can be driven in conjunction with the first motor 3, or in conjunction with the second motor 4 and the third motor 5 to achieve an extended-range front-wheel drive operating condition or an extended-range rear-wheel drive operating condition. The range extender can also be driven in conjunction with the first motor 3, the second motor 4 and the third motor 5 at the same time to achieve an extended-range four-wheel drive operating condition.

[0049] That is to say, the electric energy generated by the generator 99 can be directly provided to the first motor 3, the second motor 4 and the third motor 5 to drive the first wheel axle 1 and the second wheel axle 2 to rotate, or it can be stored in the battery, and then the battery supplies power to the first motor 3, the second motor 4 and the third motor 5, so that the first motor 3, the second motor 4 and the third motor 5 can drive the first wheel axle 1 and the second wheel axle 2 to rotate. In this operating condition, the engine 98 does not directly drive the wheels, but provides electric energy to the first motor 3, the second motor 4 and the third motor 5 through the generator 99, which is suitable for long-distance driving or when the battery is insufficient and additional energy is required.

[0050] (3) In the braking energy recovery mode, the first motor 3, the second motor 4 and the third motor 5 are used to recover braking energy when the vehicle brakes. That is, when the vehicle brakes, the first motor 3, the second motor 4 and the third motor 5 can be used as generators to convert the vehicle's kinetic energy into electrical energy and store it in the battery, which is beneficial to extend the battery's cruising range, improve the vehicle's energy efficiency and reduce fuel consumption.

[0051] (4) In the reversing mode, the reversing function can be achieved by controlling the first motor 3 to rotate in reverse, or by controlling the second motor 4 and the third motor 5 to rotate in reverse.

[0052] According to the power drive system 100 of the embodiment of the present invention, three motors are adopted to realize pure electric two-wheel drive and extended-range two-wheel drive functions, thereby realizing flexible and efficient vehicle drive. Compared with the traditional hybrid extended-range hybrid power system, the present invention highlights the pure electric driving function, reduces fuel consumption, and improves the vehicle's fuel economy, power performance and handling; at the same time, the second motor 4 and the third motor 5 are both coaxially arranged with the second wheel axle 2, and the first motor shaft 41 and the second motor shaft 51 are both sleeved outside the second wheel axle 2, shortening the overall axial dimension of the rear electric axle, reducing the additional space occupied by the second motor 4 and the third motor 5, improving the compactness of the structure, and increasing the layout space of the battery pack or fuel tank of the whole vehicle, thereby improving the cruising range, and having better use effect and a wider range of applications.

[0053] In some embodiments, the second transmission structure 7 includes a first transmission gear set 71, the first motor shaft 41 is provided with a first active input gear 411, the first half shaft 21 is provided with a first active output gear 211, and the first transmission gear set 71 is respectively engaged with the first active input gear 411 and the first active output gear 211 for transmission.

[0054] Specifically, if Figure 1 As shown, the second transmission structure 7 includes a first transmission gear set 71. The first transmission gear set 71 and the first motor shaft 41 are spaced apart and distributed in parallel along the longitudinal direction of the vehicle, that is, along the front and rear direction of the vehicle. The first motor shaft 41 is sleeved outside the first half shaft 21, and the first transmission gear set 71 is located on the front side of the first motor shaft 41. In this way, the space occupied by the second motor 4 is reduced, and the position of the first transmission gear set 71 is reasonably set, so that the first transmission gear set 71 is close to the first motor shaft 41 and the first half shaft 21, which is conducive to efficient power transmission.

[0055] The first motor shaft 41 is equipped with a first driving input gear 411, and the first half-shaft 21 is equipped with a first driving output gear 211. The first transmission gear set 71 meshes with the first driving input gear 411 and the first driving output gear 211, respectively. Specifically, rotation of the first motor shaft 41 drives the first driving input gear 411 to rotate synchronously. The first driving input gear 411 meshes with the first transmission gear set 71, which in turn drives the first transmission gear set 71 to rotate synchronously. Furthermore, the first transmission gear set 71 meshes with the first driving output gear 211, allowing the first driving output gear 211 to drive the first half-shaft 21 to rotate synchronously. This arrangement of the first motor shaft 41 sleeved outside the first half-shaft 21 reduces the space occupied by the first driving input gear 411, further shortening the axial dimension of the rear electric axle and enabling power transmission from the second motor 4 to the second wheel axle 2.

[0056] In other embodiments, the third transmission structure 8 includes a second transmission gear set 81, the second motor shaft 51 is provided with a second active input gear 511, the second half shaft 22 is provided with a second active output gear 221, and the second transmission gear set 81 is respectively engaged with the second active input gear 511 and the second active output gear 221 for transmission.

[0057] Specifically, if Figure 1As shown, the third transmission structure 8 includes a second transmission gear set 81. The second transmission gear set 81 and the second motor shaft 51 are spaced apart and distributed in parallel along the longitudinal direction of the vehicle, that is, along the front and rear direction of the vehicle. The second motor shaft 51 is sleeved outside the second half shaft 22, and the second transmission gear set 81 is located on the front side of the second motor shaft 51. In this way, the space occupied by the second motor 4 is reduced, and the position of the second transmission gear set 81 is reasonably set, so that the second transmission gear set 81 is close to the second motor shaft 51 and the second half shaft 22, which is conducive to efficient power transmission.

[0058] The second motor shaft 51 is equipped with a second driving input gear 511, and the second half-shaft 22 is equipped with a second driving output gear 221. The second transmission gear set 81 meshes with the second driving input gear 511 and the second driving output gear 221, respectively. Specifically, rotation of the second motor shaft 51 drives the second driving input gear 511 to rotate synchronously. The second driving input gear 511 meshes with the second transmission gear set 81, which in turn drives the second transmission gear set 81 to rotate synchronously. Furthermore, the second transmission gear set 81 meshes with the second driving output gear 221, allowing the second driving output gear 221 to drive the second half-shaft 22 to rotate synchronously. This arrangement of the second motor shaft 51 outside the second half-shaft 22 reduces the space occupied by the second driving input gear 511, further shortening the axial dimension of the rear electric axle and enabling power transmission from the second motor 4 to the second wheel axle 2.

[0059] In some embodiments, the first transmission gear set 71 includes a coaxially arranged second transmission gear 711 and a third transmission gear 712 . The second transmission gear 711 is meshed with the first driving input gear 411 for transmission, and the third transmission gear 712 is meshed with the first driving output gear 211 for transmission.

[0060] Specifically, if Figure 1 As shown, the first transmission gear set 71 is provided with a second transmission gear 711 and a third transmission gear 712. The second transmission gear 711 and the third transmission gear 712 are coaxially arranged, so that when the second transmission gear 711 rotates, the third transmission gear 712 can be driven to rotate, and the second transmission gear 711 is engaged with the first driving input gear 411 for transmission, and the third transmission gear 712 is engaged with the first driving output gear 211 for transmission.

[0061] That is, when the first motor shaft 41 rotates, it can drive the first driving input gear 411 to rotate synchronously. The first driving input gear 411 is meshed with the second transmission gear 711 for transmission, and then the second transmission gear 711 is driven to rotate synchronously. The third transmission gear 712 can rotate together with the second transmission gear 711, so that the third transmission gear 712 can be meshed with the first driving output gear 211 for transmission, so that the first driving output gear 211 drives the first half-shaft 21 to rotate synchronously, thereby changing the force transmission path, improving the structural compactness of the second transmission structure 7, and increasing the layout space for other structural components.

[0062] In addition, the number of teeth of the second transmission gear 711 and the third transmission gear 712 can be set to be the same or different in actual settings. When the number of teeth of the second transmission gear 711 and the third transmission gear 712 are set to be different, the speed ratio during speed transmission can be changed to meet more usage requirements.

[0063] In other embodiments, the second transmission gear set 81 includes a fourth transmission gear 811 and a fifth transmission gear 812 arranged coaxially. The fourth transmission gear 811 is meshed with the second active input gear 511 for transmission, and the fifth transmission gear 812 is meshed with the second active output gear 221 for transmission.

[0064] Specifically, if Figure 1 As shown, the second transmission gear set 81 is provided with a fourth transmission gear 811 and a fifth transmission gear 812. The fourth transmission gear 811 and the fifth transmission gear 812 are coaxially arranged, so that when the fourth transmission gear 811 rotates, the fifth transmission gear 812 can be driven to rotate, and the fourth transmission gear 811 and the second active input gear 511 are meshed for transmission, and the fifth transmission gear 812 and the second active output gear 221 are meshed for transmission.

[0065] That is, when the second motor shaft 51 rotates, it can drive the second driving input gear 511 to rotate synchronously. The second driving input gear 511 is meshed with the fourth transmission gear 811 for transmission, and then the fourth transmission gear 811 is driven to rotate synchronously. The fifth transmission gear 812 can rotate together with the fourth transmission gear 811, so that the fifth transmission gear 812 can be meshed with the second driving output gear 221 for transmission, so that the second driving output gear 221 drives the second half-shaft 22 to rotate synchronously, thereby changing the force transmission path, improving the structural compactness of the second transmission structure 7, and increasing the layout space for other structural components.

[0066] In addition, the number of teeth of the fourth transmission gear 811 and the fifth transmission gear 812 can be set to be the same or different in actual settings. When the number of teeth of the fourth transmission gear 811 and the fifth transmission gear 812 are set to be different, the speed ratio during speed transmission can be changed to meet more usage requirements.

[0067] In some embodiments, a first differential 92 is connected between the first half-shaft 21 and the second half-shaft 22 , and the first active output gear 211 and the second active output gear 221 are respectively connected to the first differential 92 in terms of power.

[0068] Specifically, if Figure 1 As shown, the second wheel axle 2 includes a first half-shaft 21 and a second half-shaft 22. The first half-shaft 21 and the second half-shaft 22 can be the left rear wheel axle and the right rear wheel axle to respectively connect the left rear wheel and the right rear wheel, and a first differential 92 is connected between the first half-shaft 21 and the second half-shaft 22. The second motor 4 can drive the first half-shaft 21 to rotate through the second transmission structure 7 to drive one of the rear wheels 95 to rotate. The third motor 5 can drive the second half-shaft 22 to rotate through the third transmission structure 8 to drive the other of the rear wheels 95 to rotate.

[0069] Furthermore, the first active output gear 211 and the second active output gear 221 can be respectively connected to the first differential 92 in terms of power, that is, the power of the first active output gear 211 can be transmitted to the first differential 92, and the power of the second active output gear 221 can also be transmitted to the first differential 92. Through the differential action of the first differential 92, the first half-shaft 21 and the second half-shaft 22 are rotated at different speeds, thereby causing the left and right rear wheels to rotate at different speeds, thereby ensuring the driving stability of the vehicle when turning or on uneven roads.

[0070] In some embodiments, the second motor 4, the first differential 92 and the third motor 5 are spaced apart in sequence along the axial direction of the second wheel axle 2, and the first motor shaft 41 is located between the second motor 4 and the first differential 92, and the second motor shaft 51 is located between the third motor 5 and the first differential 92.

[0071] Specifically, if Figure 1 As shown, the second motor 4, the first differential 92 and the third motor 5 are sequentially spaced apart and distributed along the axial direction of the second wheel shaft 2. Figure 1 As shown in the figure, the second motor 4 is located on the left, the third motor 5 is located on the right, and the first differential 92 is located between the second motor 4 and the third motor 5. Of course, the second motor 4 can also be located on the right and the third motor 5 can be located on the left. The figure is only an example.

[0072] Furthermore, the first motor shaft 41 is located between the second motor 4 and the first differential 92 to facilitate connection with the second transmission structure 7, and the second motor shaft 51 is located between the third motor 5 and the first differential 92 to facilitate connection with the third transmission structure 8, which is beneficial to shortening the axial dimension and power transmission path of the rear electric axle, thereby increasing the layout space for other structural components while improving the power transmission efficiency.

[0073] In actual design, the second transmission structure 7, the third transmission structure 8 and the first differential 92 can be arranged in the rear reduction gearbox 97 to protect the second transmission structure 7, the third transmission structure 8 and the first differential 92 and ensure stable transmission of the second transmission structure 7, the third transmission structure 8 and the first differential 92.

[0074] In some embodiments, along the longitudinal direction of the vehicle, the first transmission gear set 71 and the second transmission gear set 81 are both located between the first wheel axle 1 and the second wheel axle 2 .

[0075] Specifically, along the longitudinal direction of the vehicle, that is, along the front-rear direction of the vehicle, the first transmission gear set 71 and the second transmission gear set 81 are both located between the first wheel axle 1 and the second wheel axle 2. Figure 1 As shown, the first wheel axle 1 and the second wheel axle 2 are distributed in parallel and spaced apart in the front-to-rear direction of the vehicle, the first transmission gear set 71 and the second transmission gear set 81 are distributed in parallel and spaced apart in the left-to-right direction of the vehicle, the first transmission gear set 71 and the second transmission gear set 81 are located on the rear side of the first wheel axle 1, the first transmission gear set 71 and the second transmission gear set 81 are located on the front side of the second wheel axle 2, and the first transmission gear set 71 and the second transmission gear set 81 are arranged close to the second wheel axle 2.

[0076] Such an arrangement allows the various structures to be reasonably and compactly arranged at the bottom of the vehicle, making the overall structure of the power drive system 100 compact, which is conducive to the orderly and efficient transmission of power, and the first transmission gear set 71 and the second transmission gear set 81 are close to the second wheel axle 2, which is conducive to the power of the second motor 4 being quickly and efficiently transmitted to the first half shaft 21 through the first transmission gear set 71, and is conducive to the power of the third motor 5 being quickly and efficiently transmitted to the second half shaft 22 through the second transmission gear set 81.

[0077] In some embodiments, along the longitudinal direction of the vehicle, the first motor 3 and the first transmission structure 6 are both located between the first wheel axle 1 and the second wheel axle 2 .

[0078] Specifically, the first motor 3 and the first transmission structure 6 are located between the first wheel axle 1 and the second wheel axle 2 in the longitudinal direction of the vehicle, that is, in the front-rear direction of the vehicle. Figure 1 As shown, the first motor 3 and the first transmission structure 6 are located on the rear side of the first wheel axle 1 and the front side of the second wheel axle 2 .

[0079] Such an arrangement can fully utilize the space at the bottom of the vehicle, which is conducive to keeping the center of gravity of the vehicle at a lower position, and more evenly distributing the weight on the first wheel axle 1 and the second wheel axle 2 of the vehicle, thereby improving the stability and balance of the vehicle.

[0080] At the same time, the first motor 3 and the first transmission structure 6 are integrated together and arranged between the first wheel axle 1 and the second wheel axle 2, which can also reduce energy loss during power transmission and facilitate the coordination of the first motor 3 and the range extender, that is, the first motor 3 and the engine 98 and the generator 99, thereby improving driving efficiency.

[0081] In other embodiments, the first wheel axle 1 is the front wheel axle of the vehicle, and the second wheel axle 2 is the rear wheel axle of the vehicle.

[0082] That is to say, if Figure 1 As shown, the first wheel axle 1 is located at the front of the vehicle and is connected to the front wheel 94. In this way, the first motor 3 can drive the first wheel axle 1, that is, the front wheel axle of the vehicle, to rotate, and then drive the two front wheels 94 to rotate, realizing front-wheel drive. The second wheel axle 2 is located at the rear of the vehicle and is connected to the rear wheel 95. In this way, the second motor 4 and the third motor 5 can drive the second wheel axle 2, that is, the rear wheel axle of the vehicle, to rotate, and then drive the two rear wheels 95 to rotate, realizing rear-wheel drive. When the first motor 3, the second motor 4 and the third motor 5 are driven at the same time, four-wheel drive is realized.

[0083] In some embodiments, as Figure 1 As shown, the first transmission structure 6 includes a first input shaft 61, a first intermediate shaft 62 and a first transmission shaft 63. The first input shaft 61, the first intermediate shaft 62 and the first transmission shaft 63 are spaced apart and distributed in parallel along the transverse direction of the vehicle, that is, along the left and right directions of the vehicle. The first intermediate shaft 62 is located between the first input shaft 61 and the first transmission shaft 63. In this way, the bottom space of the vehicle can be fully utilized to arrange the first transmission structure 6 to avoid interference between the various shafts. At the same time, the transverse arrangement of the various shafts also shortens the power transmission path from the first transmission shaft 63 to the front wheels 94, thereby improving the power transmission efficiency.

[0084] like Figure 1 As shown, the first input shaft 61 is provided with a first input gear 611, the first intermediate shaft 62 is provided with a coaxially distributed first intermediate gear 621 and a first transmission gear 622, and the first transmission shaft 63 is provided with a first output gear 631. That is to say, when the first input shaft 61 rotates, it can drive the first input gear 611 to rotate synchronously, when the first intermediate shaft 62 rotates, it can drive the first intermediate gear 621 and the first transmission gear 622 to rotate, and when the first transmission gear 622 rotates, it can drive the first output gear 631 to rotate.

[0085] The first input shaft 61 is connected to the first motor 3 , and the first transmission shaft 63 is connected to the first wheel axle 1 . The first input gear 611 is meshed with the first intermediate gear 621 , and the first transmission gear 622 is meshed with the first output gear 631 .

[0086] Specifically, if Figure 1As shown, the motor shaft of the first motor 3 is connected to the first input shaft 61, the first input gear 611 is meshed with the first intermediate gear 621, and the first transmission gear 622 is meshed with the first output gear 631. Thus, the first motor 3 can provide power to drive the first input shaft 61 to rotate. When the first input shaft 61 rotates, the first input shaft 61 can drive the first input gear 611 to rotate, so that the first input gear 611 can drive the first intermediate gear 621 meshed therewith to rotate. When the first intermediate gear 621 rotates, it can drive the first intermediate shaft 62 and the first transmission gear 622 to rotate. Then, when the first transmission gear 622 rotates, it can drive the first output gear 631 meshed therewith to rotate, thereby driving the first transmission shaft 63 to rotate, thereby achieving power transmission from the first motor 3 to the first transmission shaft 63.

[0087] In actual design, the first drive shaft 63 can be power-connected to the first wheel axle 1 via the front drive shaft 93 and the second differential 91. That is, the power of the first drive shaft 63 can be transmitted to the front drive shaft 93 and the second differential 91, and then to the first wheel axle 1, thereby achieving power connection and power transmission from the first drive shaft 63 to the first wheel axle 1. The differential action of the second differential 91 can also enable the front left and right wheels to rotate at different speeds. The first transmission structure 6 can also be disposed in the intermediate transfer case 96 to ensure stable transmission of the first transmission structure 6.

[0088] The utility model also provides a vehicle.

[0089] The vehicle according to the embodiment of the present invention is provided with any one of the power drive systems 100 described above.

[0090] According to the vehicle of the embodiment of the present invention, three motors are adopted to realize pure electric two-wheel drive and extended-range two-wheel drive functions, thereby realizing flexible and efficient vehicle drive. Compared with the traditional hybrid extended-range hybrid power system, the present invention highlights the pure electric driving function, reduces fuel consumption, and improves the fuel economy, power performance and handling of the vehicle; at the same time, the second motor 4 and the third motor 5 are both coaxially arranged with the second wheel axle 2, and the first motor shaft 41 and the second motor shaft 51 are both sleeved outside the second wheel axle 2, shortening the overall axial dimension of the rear electric axle, reducing the additional space occupied by the second motor 4 and the third motor 5, improving the compactness of the structure, and can increase the layout space of the battery pack or fuel tank of the whole vehicle, thereby improving the cruising range, and having better use effect and wider scope of application.

[0091] The vehicle of this embodiment may be an off-road vehicle, a sedan, a pickup truck, an SUV, etc.

[0092] In some embodiments, the engine 98 and the generator 99 are mounted within the nacelle.

[0093] Specifically, if Figure 1As shown, the engine 98 and the generator 99 are arranged at the front of the vehicle. In this way, the engine 98 and the generator 99, i.e., the range extender, can be installed in the engine compartment to ensure the normal operation of the engine 98 and the generator 99 and reduce the impact on the surrounding environment, which is convenient for maintenance and operation. The arrangement is longitudinal, that is, the engine 98 and the generator 99 are arranged in sequence along the front and rear directions, and the generator 99 is arranged close to the first motor 3, which is conducive to transmitting electrical energy to the first motor 3. Of course, in practice, since the range extender does not directly participate in the drive, the engine 98 and the generator 99 can also be installed horizontally in the engine compartment, and can be flexibly arranged according to the space of the entire vehicle, and is not limited to the description in this embodiment.

[0094] In other embodiments, the first motor 3 and the first transmission structure 6 are located under the vehicle floor.

[0095] Specifically, refer to Figure 1 As shown, the first motor 3 and the first transmission structure 6 are roughly located in the middle of the vehicle. The first motor 3 and the first transmission structure 6 can be set under the vehicle floor. This is beneficial to lowering the center of gravity of the vehicle and to facilitate the power of the first motor 3 to directly drive the first wheel axle 1 through the first transmission structure 6.

[0096] In some embodiments, a differential lock may be provided on the first differential 92 or the second differential 91 , or a differential lock may be provided on both the first differential 92 and the second differential 91 , and the differential lock may be flexibly provided according to the actual needs of the vehicle.

[0097] The following is the power transmission path of the power drive system 100 of the present invention under different operating conditions:

[0098] (1) In pure electric front-wheel drive mode, the first motor 3 is driven independently, and the power of the first motor 3 is transmitted to the first wheel axle 1 through the first transmission structure 6, and then transmitted to the front wheels 94 to drive the vehicle. The high gear or low gear can be selected through the synchronizer S1. The low gear can be combined with the differential lock to improve the low-speed escape ability, and the high gear can ensure high speed while taking into account fuel economy.

[0099] (2) In pure electric rear-wheel drive mode, the second motor 4 and the third motor 5 are driven, the power of the second motor 4 is transmitted to the first half-shaft 21 through the second transmission structure 7, and the power of the third motor 5 is transmitted to the second half-shaft 22 through the third transmission structure 8, and then transmitted to the two rear wheels 95 to drive the vehicle.

[0100] (3) In pure electric four-wheel drive operation, the first motor 3, the second motor 4 and the third motor 5 are driven simultaneously, and their power is transmitted to the first wheel axle 1 and the second wheel axle 2 through the first transmission structure 6, the second transmission structure 7 and the third transmission mechanism respectively, and then transmitted to the front wheels 94 and the rear wheels 95 to drive the vehicle. The synchronizer S1 can be adjusted to select the appropriate gear according to the driving conditions.

[0101] (4) In the extended-range front-wheel drive mode, the range extender works, that is, the generator 99 generates electricity and transmits the electric energy to the first motor 3, and the first motor 3 drives. The subsequent driving mode is the same as the pure electric front-wheel drive mode.

[0102] (5) In the extended-range rear-wheel drive mode, the range extender works, that is, the generator 99 generates electricity and transmits the electric energy to the second motor 4 and the third motor 5, and the second motor 4 and the third motor 5 are driven. The subsequent driving mode is the same as the pure electric rear-wheel drive mode.

[0103] (6) In the extended-range four-wheel drive mode, the range extender works, that is, the generator 99 generates electricity and transmits the electric energy to the first motor 3, the second motor 4 and the third motor 5. The first motor 3, the second motor 4 and the third motor 5 are driven simultaneously, and the subsequent driving mode is the same as the pure electric four-wheel drive mode.

[0104] (7) During the braking energy recovery operation, the vehicle recovers braking energy through the first motor 3, the second motor 4 and the third motor 5. That is, when the vehicle brakes, the first motor 3, the second motor 4 and the third motor 5 can be used as a generator 99 to convert the vehicle's kinetic energy into electrical energy and store it in the battery, which is beneficial to extend the battery's range, improve the vehicle's energy efficiency and reduce fuel consumption.

[0105] (8) In the reversing state, the reversing function can be realized by controlling the reverse rotation of the first motor 3 or the second motor 4 and the third motor 5.

[0106] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0107] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power drive system, characterized in that: include: a first wheel axle and a second wheel axle, wherein the first wheel axle and the second wheel axle are spaced apart from each other in the longitudinal direction of the vehicle, and the second wheel axle includes a first half-axle and a second half-axle; An engine and a generator, wherein the engine is used to drive the generator to generate electricity; a first motor, the first motor being dynamically connected to the first wheel axle via a first transmission structure, so as to drive the first wheel axle to rotate; The second motor and the third motor, the second motor is connected to the first motor shaft, the first motor shaft is sleeved outside the first half-shaft, the first motor shaft is dynamically connected to the first half-shaft through a second transmission structure, so as to drive the first half-shaft to rotate, the third motor is connected to the second motor shaft, the second motor shaft is sleeved outside the second half-shaft, the second motor shaft is dynamically connected to the second half-shaft through a third transmission structure, so as to drive the second half-shaft to rotate.

2. The power drive system according to claim 1, characterized in that: The second transmission structure includes a first transmission gear set, the first motor shaft is provided with a first active input gear, the first half shaft is provided with a first active output gear, and the first transmission gear set is respectively meshed with the first active input gear and the first active output gear for transmission; And / or, the third transmission structure includes a second transmission gear set, the second motor shaft is provided with a second active input gear, the second half shaft is provided with a second active output gear, and the second transmission gear set is respectively engaged with the second active input gear and the second active output gear for transmission.

3. The power drive system according to claim 2, characterized in that: The first transmission gear set includes a second transmission gear and a third transmission gear arranged coaxially, the second transmission gear is meshed with the first active input gear for transmission, and the third transmission gear is meshed with the first active output gear for transmission; And / or, the second transmission gear set includes a fourth transmission gear and a fifth transmission gear arranged coaxially, the fourth transmission gear is meshed with the second active input gear for transmission, and the fifth transmission gear is meshed with the second active output gear for transmission.

4. The power drive system according to claim 2, characterized in that: A first differential is connected between the first half-shaft and the second half-shaft, and the first active output gear and the second active output gear are respectively connected to the first differential in terms of power.

5. The power drive system according to claim 4, characterized in that: The second motor, the first differential and the third motor are spaced apart in sequence along the axial direction of the second wheel shaft, and the first motor shaft is located between the second motor and the first differential, and the second motor shaft is located between the third motor and the first differential.

6. The power drive system according to claim 2, characterized in that: In the longitudinal direction of the vehicle, the first transmission gear set and the second transmission gear set are both located between the first wheel axle and the second wheel axle.

7. The power drive system according to any one of claims 1 to 6, characterized in that: Along the longitudinal direction of the vehicle, the first motor and the first transmission structure are both located between the first wheel axle and the second wheel axle; And / or, the first wheel axle is the front wheel axle of the vehicle, and the second wheel axle is the rear wheel axle of the vehicle.

8. The power drive system according to any one of claims 1 to 6, characterized in that: The first transmission structure includes a first input shaft, a first intermediate shaft and a first transmission shaft, the first input shaft is provided with a first input gear, the first intermediate shaft is provided with a first intermediate gear and a first transmission gear distributed coaxially, and the first transmission shaft is provided with a first output gear; The first input shaft is connected to the first motor power, and the first transmission shaft is connected to the first wheel axle power, the first input gear is meshed with the first intermediate gear for transmission, and the first transmission gear is meshed with the first output gear for transmission.

9. A vehicle, characterized in that: A power drive system according to any one of claims 1 to 8 is provided.

10. The vehicle according to claim 9, characterized in that The engine and generator are installed in the engine room; And / or, the first motor and the first transmission structure are located under the vehicle floor.

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