Power driving system and vehicle

Abstract

The utility model discloses a power-driven system and a vehicle, the power-driven system comprises a first wheel axle and a second wheel axle, the first wheel axle and the second wheel axle are distributed at intervals along the longitudinal direction of the vehicle; the engine is used for driving the generator to generate electricity; 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 wheel shaft comprises a first half shaft and a second half shaft, the second motor 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 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, the pure electric driving function is highlighted, oil consumption is reduced, decoupling of the two rear wheels is achieved at the same time, leopard type turning of a similar equation can be achieved, the turning radius of the vehicle is reduced, and controllability and performance of the vehicle are improved.

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 with the power drive system. Background Art

[0002] With the continuous penetration of new energy technologies, more and more car companies have their own new energy routes. In vehicles, traditional ICE power has high fuel consumption due to the large-displacement engine, and it is difficult to meet future fuel consumption regulations. Car companies are exploring new energy technology routes for vehicles. There are three main types of new energy vehicles on the current market: the first type is based on traditional power with minimal changes, using the P2 architecture; the second type adopts a pure electric EV architecture, mostly using high-power three or four motors; the third type is a hybrid architecture PHEV, either extended-range or hybrid.

[0003] In the existing extended-range hybrid architecture, fuel consumption is high and the turning radius is large, so there is room for improvement. Utility Model Content

[0004] 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. It also decouples the two rear wheels, enabling a leopard-like U-turn, reducing the vehicle's turning radius and improving its handling and performance.

[0005] 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; 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 wheel axle includes a first half-shaft and a second half-shaft, the second motor is connected to the first half-shaft through a second transmission structure for driving the first half-shaft to rotate, and the third motor is connected to the second half-shaft through a third transmission structure for driving the second half-shaft to rotate.

[0006] 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 driving. Under the extended-range working condition, the range extender composed of the engine and the generator can provide additional electric energy for the vehicle. 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 of the vehicle; through the rear dual-motor setting of the second motor and the third motor, the first half-shaft and the second half-shaft can be driven to rotate separately, so that the left rear wheel and the right rear wheel can be driven to rotate separately, realizing the decoupling of the two rear wheels, and then realizing a leopard-like U-turn similar to the Fang Cheng leopard, reducing the vehicle turning radius, and improving the vehicle's handling and performance.

[0007] According to the power drive system of some embodiments of the present invention, along the longitudinal direction of the vehicle, the generator, the first motor, and the second motor are distributed in sequence at intervals, or the generator, the first motor, and the third motor are distributed in sequence at intervals.

[0008] According to the power drive system of some embodiments of the present invention, along the longitudinal direction of the vehicle, the generator, the first motor, the second motor, and the third motor are all located between the first wheel axle and the second wheel axle.

[0009] According to the power drive system of some embodiments of the present invention, along the transverse direction of the vehicle, the second transmission structure and the third transmission structure are distributed between the second motor and the third motor; and / or, the second motor and the third motor are symmetrically distributed with respect to the longitudinal direction of the vehicle; and / or, the second transmission structure and the third transmission structure are symmetrically distributed with respect to the longitudinal direction of the vehicle.

[0010] According to the power drive system of some embodiments of the present invention, 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.

[0011] 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 first intermediate gear and a first transmission gear distributed coaxially, and the first transmission shaft is provided with a first output gear; wherein, the first input shaft is connected to the power of the first motor, and the first transmission shaft is connected to the power of the first wheel axle, 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.

[0012] According to the power drive system of some embodiments of the present invention, there are multiple first input gears, and the multiple first input gears are distributed at intervals along the axial direction of the first input shaft; there are multiple first intermediate gears, and the multiple first intermediate gears are meshed with the multiple first input gears one-to-one, and the multiple first intermediate gears are loosely mounted outside the first intermediate shaft and are suitable for being selectively fixed to the first intermediate shaft.

[0013] According to the power drive system of some embodiments of the present invention, the second transmission structure includes a second intermediate shaft, the motor shaft of the second motor is provided with a first motor gear, the second intermediate shaft is provided with a second intermediate gear and a third intermediate gear distributed coaxially, the first motor gear is engaged with the second intermediate gear, and the third intermediate gear is dynamically connected to the first half-shaft; and / or, the third transmission structure includes a third intermediate shaft, the motor shaft of the third motor is provided with a second motor gear, the third intermediate shaft is provided with a fourth intermediate gear and a fifth intermediate gear distributed coaxially, the second motor gear is engaged with the fourth intermediate gear, and the fifth intermediate gear is dynamically connected to the second half-shaft.

[0014] The utility model also provides a vehicle.

[0015] A vehicle according to an embodiment of the present invention is provided with the power drive system described in any one of the above embodiments.

[0016] According to some embodiments of the vehicle of the present invention, the engine and the generator are installed in an engine compartment; and / or the first motor and the first transmission structure are located under the vehicle floor.

[0017] The advantages of the vehicle and the above-mentioned power drive system are the same as those of the prior art and will not be described in detail here.

[0018] 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

[0019] 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:

[0020] Figure 1 It is a schematic diagram of the principle of a power drive system according to an embodiment of the present utility model.

[0021] Reference numerals:

[0022] Power drive system 100,

[0023] First wheel axle 1, second wheel axle 2, first half axle 21, second half axle 22,

[0024] Engine 3, generator 4, first motor 51, second motor 52, first motor gear 521, third motor 53, second motor gear 531,

[0025] 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,

[0026] Second transmission structure 7, second intermediate shaft 71, second intermediate gear 711, third intermediate gear 712,

[0027] The third transmission structure 8, the third intermediate shaft 81, the fourth intermediate gear 812, the fifth intermediate gear 813,

[0028] Front differential 91, front drive shaft 92, front wheel 93, left rear wheel 941, right rear wheel 942, intermediate transfer case 95, rear reduction box 96, synchronizer S1, differential lock S2. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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, improves the fuel economy of the vehicle, and at the same time realizes the decoupling of the two rear wheels, which can achieve a leopard-like U-turn similar to that of a leopard, shortens the vehicle's turning radius, and improves the vehicle's controllability and performance.

[0034] 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 3, a generator 4, a first motor 51, a second motor 52 and a third motor 53.

[0035] 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. For example, referring to the attached Figure 1 As shown, the first wheel axle 1 is located at the front of the vehicle and connected to the front wheels 93, and the second wheel axle 2 is located at the rear of the vehicle and connected to the rear wheels.

[0036] Power drive system 100 also includes an engine 3 and a generator 4. Engine 3 is used to drive generator 4 to generate electricity. That is, engine 3 can serve as a power generation source, providing electrical energy for the entire power drive system 100. Engine 3 and generator 4 can together constitute a range extender, generating electricity during range extension. Engine 3 and generator 4 can be matched according to performance requirements to provide electricity when the vehicle battery is low or requires additional power. In actual design, engine 3 and generator 4 can be located in the engine compartment.

[0037] The first motor 51, the second motor 52, and the third motor 53 are electric drive devices, that is, the first motor 51, the second motor 52, and the third motor 53 are drive motors and can be driven independently. When the first motor 51 is driven alone, the first wheel axle 1 can rotate independently; when the second motor 52 is driven alone, the first half-shaft 21 can rotate independently; and when the third motor 53 is driven alone, the second half-shaft 22 can rotate independently. When the first motor 51, the second motor 52, and the third motor 53 are driven simultaneously, the first wheel axle 1 and the second wheel axle 2, i.e., the first half-shaft 21 and the second half-shaft 22, can rotate simultaneously. Thus, when the range extender is off, pure electric front-wheel drive, rear-wheel drive, and all-wheel drive functions can be achieved. When the range extender is operating, the electrical energy generated by the generator 4 can be transferred to the first motor 51, the second motor 52, or the third motor 53, or to all three motors simultaneously, achieving extended-range front-wheel drive, rear-wheel drive, and all-wheel drive functions while reducing fuel consumption.

[0038] Furthermore, the first motor 51 is power-connected to the first axle 1 via the first transmission structure 6 to drive the first axle 1 in rotation. Specifically, the first motor 51 transmits power to the first axle 1 via the first transmission structure 6, achieving power transmission from the first motor 51 to the first axle 1. This allows the first motor 51 to drive the first axle 1 in rotation, and the first axle 1, in turn, drives the connected wheel in rotation. This allows the vehicle to be electrically driven by the first motor 51, reducing fuel consumption and lowering fuel consumption.

[0039] Furthermore, the second wheel axle 2 includes a first half-shaft 21 and a second half-shaft 22, the second motor 52 is connected to the first half-shaft 21 through the second transmission structure 7 for driving the first half-shaft 21 to rotate, and the third motor 53 is connected to the second half-shaft 22 through the third transmission structure 8 for driving the second half-shaft 22 to rotate.

[0040] Specifically, refer to the attached Figure 1As shown, when the second wheel axle 2 is located at the rear of the vehicle, the first half-shaft 21 and the second half-shaft 22 can be the rear left half-shaft and the rear right half-shaft, the rear left half-shaft can be connected to the left rear wheel 941 of the vehicle to transmit power to the left rear wheel 941 and drive the left rear wheel 941 to rotate, and the rear right half-shaft can be connected to the right rear wheel 942 of the vehicle to transmit power to the right rear wheel 942 and drive the right rear wheel 942 to rotate. The second motor 52 is connected to the first half-shaft 21 through the second transmission structure 7 for driving the first half-shaft 21 to rotate, that is, the second motor 52 can transmit power to the first half-shaft 21 through the second transmission structure 7, thereby realizing power transmission from the second motor 52 to the first half-shaft 21, so that the second motor 52 can drive the first half-shaft 21 to rotate, and the first half-shaft 21 can drive the left rear wheel 941 connected thereto to rotate; the third motor 53 is connected to the second half-shaft 22 through the third transmission structure 8 for driving the second half-shaft 22 to rotate, that is, the third motor 53 can transmit power to the second half-shaft 22 through the third transmission structure 8, so that the second motor 52 can drive the second half-shaft 22 to rotate, and the second half-shaft 22 can drive the right rear wheel 942 connected thereto to rotate.

[0041] Thus, the vehicle is electrically driven by the second motor 52 and the third motor 53, which further reduces the use of fuel and reduces fuel consumption. The rear dual-motor setting of the second motor 52 and the third motor 53 provides the second wheel axle 2 with higher driving force and flexibility, and can drive the first half-shaft 21 and the second half-shaft 22 to rotate separately, thereby driving the left rear wheel 941 and the right rear wheel 942 to rotate separately, that is, allowing each rear wheel to obtain power independently, realizing the decoupling of the two rear wheels, and then realizing a leopard-like U-turn similar to the leopard, reducing the vehicle's turning radius, and improving the vehicle's handling and performance.

[0042] 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 51 or the second motor 52, the third motor 53 to reverse). (1) In the pure electric mode, the first motor 51, the second motor 52 and the third motor 53 are completely independent, and each motor can be driven independently, that is, the first motor 51 or the second motor 52 or the third motor 53 can be driven separately to rotate the first wheel axle 1 or the second wheel axle 2, thereby realizing the pure electric front drive mode or the pure electric rear drive mode, wherein the first half shaft 21 or the second half shaft 22 can be driven independently or simultaneously to realize the pure electric rear drive mode; the first motor 51, the second motor 52 and the third motor 53 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, the engine 3 and the generator 4 are in the off state, and it is suitable for short-distance driving or when the battery is fully charged. (2) In the extended-range mode, the range extender is started, and the engine 3 drives the generator 4 to generate electricity. The range extender can cooperate with any motor to drive independently to achieve the extended-range front-wheel drive mode or the extended-range rear-wheel drive mode, wherein the first half-shaft 21 or the second half-shaft 22 is driven independently or simultaneously to achieve the extended-range rear-wheel drive; it can also cooperate with the first motor 51, the second motor 52 and the third motor 53 to drive to achieve the extended-range four-wheel drive mode. That is, the electric energy generated by the generator 4 can be directly provided to the first motor 51, the second motor 52 and the third motor 53 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 51, the second motor 52 and the third motor 53, so that the first motor 51, the second motor 52 and the third motor 53 can drive the first wheel axle 1 and the second wheel axle 2 to rotate. In this mode, the engine 3 does not directly drive the wheels, but provides electric energy to the first motor 51 and the second motor 52 through the generator 4. It is suitable for long-distance driving or when the battery is insufficient and requires additional energy. (3) During the braking energy recovery mode, the first motor 51, the second motor 52, and the third motor 53 are used to recover braking energy when the vehicle is braking. That is, when the vehicle is braking, the first motor 51, the second motor 52, and the third motor 53 can be used as generators to convert the vehicle's kinetic energy into electrical energy and store it in the battery, which helps to extend the battery's range, improve the vehicle's energy efficiency, and reduce fuel consumption. (4) During the reversing mode, the reversing function can be achieved by controlling the reverse rotation of the first motor 51 or the second motor 52 and the third motor 53.

[0043] According to the power drive system 100 of the embodiment of the present invention, three motors are used to realize pure electric two-wheel drive and extended-range two-wheel drive functions, thereby realizing flexible and efficient vehicle driving. In the extended-range working condition, the range extender composed of the engine 3 and the generator 4 can provide additional electric energy for the vehicle. 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 of the vehicle; through the rear dual-motor setting of the second motor 52 and the third motor 53, the first half shaft 21 and the second half shaft 22 can be driven to rotate separately, so that the left rear wheel 941 and the right rear wheel 942 can be driven to rotate separately, realizing the decoupling of the two rear wheels, and then realizing a leopard-like U-turn similar to the formula leopard, reducing the vehicle turning radius, and improving the vehicle's handling and performance.

[0044] In some embodiments, along the longitudinal direction of the vehicle, the generator 4 , the first motor 51 , and the second motor 52 are sequentially spaced apart, or the generator 4 , the first motor 51 , and the third motor 53 are sequentially spaced apart.

[0045] That is, in the front-to-back direction of the vehicle, the generator 4, the first motor 51, and the second motor 52 are sequentially spaced apart and distributed from front to back. Figure 1 As shown, the generator 4 is located at the front of the vehicle, the second motor 52 is located at the rear of the vehicle, and the first motor 51 is located between the generator 4 and the second motor 52, and there is a certain distance between the three. In this way, the spacing between the various components can be reasonable, which is conducive to the arrangement of the first transmission structure 6 and the second transmission structure 7, making the layout of the entire power drive system 100 more compact and improving the power transmission efficiency.

[0046] In the front-to-rear direction of the vehicle, the generator 4, the first motor 51, and the third motor 53 are sequentially spaced apart from each other from front to rear. Figure 1 As shown, the generator 4 is located at the front of the vehicle, the third motor 53 is located at the rear of the vehicle, and the first motor 51 is located between the generator 4 and the third motor 53, and there is a certain distance between the three. In this way, the spacing between the various components can be reasonable, which is conducive to the arrangement of the first transmission structure 6 and the third transmission structure 8, making the layout of the entire power drive system 100 more compact and improving the power transmission efficiency.

[0047] In some embodiments, along the longitudinal direction of the vehicle, the generator 4 , the first motor 51 , the second motor 52 , and the third motor 53 are all located between the first wheel axle 1 and the second wheel axle 2 .

[0048] That is, the generator 4, the first motor 51 and the second motor 52 are located between the first wheel axle 1 and the second wheel axle 2 in the front-rear direction of the vehicle. Figure 1As shown, the generator 4 is located at the rear side of the first wheel axle 1 , the second motor 52 and the third motor 53 are located at the front side of the second wheel axle 2 , and the first motor 51 is located at the rear side of the generator 4 and in front of the second motor 52 and the third motor 53 .

[0049] In this way, the space between the two wheel axles is fully utilized, making the overall structure of the power drive system 100 more compact, which is conducive to shortening the power transmission path, realizing efficient power transmission, and improving the driving efficiency of the vehicle. The generator 4 and the three motors are arranged in the space between the two wheel axles, which can maximize the use of the bottom space of the vehicle to avoid interference with the operation of the generator 4 and the three motors by other components inside or outside the vehicle, so as to better adapt to different driving functions and power requirements, that is, the generator 4 can better cooperate with the first motor 51, the second motor 52 and the third motor 53 to work together to transmit power and improve the energy efficiency of the vehicle.

[0050] In some embodiments, along the transverse direction of the vehicle, the second transmission structure 7 and the third transmission structure 8 are distributed between the second motor 52 and the third motor 53 .

[0051] Specifically, if Figure 1 As shown, in the lateral direction of the vehicle, i.e., the left-right direction, the second motor 52 is located on the left, and the third motor 53 is located on the right, i.e., the second motor 52 and the third motor 53 are arranged transversely, the second transmission structure 7 is arranged near the second motor 52, and the third transmission structure 8 is arranged near the third motor 53, and the second transmission structure 7 and the third transmission structure 8 are arranged between the second motor 52 and the third motor 53. In this way, the lateral space of the vehicle is fully utilized to arrange the two transmission structures between the second motor 52 and the third motor 53, making the rear drive axle structure more compact and improving the structural compactness of the power drive system 100. In addition, the two transmission structures are arranged near the two motors, which helps shorten the power transmission path from the motor to the wheel axle, improves power transmission efficiency, and can better control the two rear wheels.

[0052] In other embodiments, the second motor 52 and the third motor 53 are symmetrically distributed with respect to the longitudinal direction of the vehicle.

[0053] That is, the second motor 52 and the third motor 53 are symmetrically distributed on both sides of the longitudinal center line of the vehicle. Figure 1As shown, the second motor 52 and the third motor 53 are symmetrically distributed on the left and right sides of the vehicle with respect to the longitudinal direction, with the second motor 52 located on the left and the third motor 53 located on the right. In this way, the power of the second motor 52 and the third motor 53 can be more evenly distributed to the left and right sides of the vehicle, maintaining the power balance of the vehicle during driving, which is beneficial to improving the vehicle's handling. At the same time, the lateral space of the vehicle can be fully utilized to set up the motors, maintaining the balance and stability of the rear of the vehicle, making the vehicle more stable during driving, and reducing safety risks such as rollover.

[0054] In other embodiments, the second transmission structure 7 and the third transmission structure 8 are symmetrically distributed with respect to the longitudinal direction of the vehicle.

[0055] That is, the second transmission structure 7 and the third transmission structure 8 are symmetrically distributed on both sides of the longitudinal center line of the vehicle. Figure 1 As shown, the second transmission structure 7 and the third transmission structure 8 are symmetrically distributed on the left and right sides relative to the longitudinal direction of the vehicle, with the second transmission structure 7 located on the left and the third transmission structure 8 located on the right. In this way, the balance and stability of the rear of the vehicle can be further maintained, and the phenomenon of tilting or swaying during the driving of the vehicle can be reduced, making the vehicle run more smoothly and the power can be distributed more evenly to the left and right sides of the vehicle, thereby optimizing the power transmission path and improving the power transmission efficiency.

[0056] In some embodiments, the first axle 1 is a front axle of the vehicle, and the second axle 2 is a rear axle of the vehicle.

[0057] In other words, refer to the attached Figure 1 As shown, the first wheel axle 1 is located at the front of the vehicle and is connected to the front wheel 93. In this way, the first motor 51 can drive the first wheel axle 1, i.e., the front wheel axle of the vehicle, to rotate, and then drive the two front wheels 93 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 wheels, and the first half-shaft 21 is connected to the left rear wheel 941, and the second half-shaft 22 is connected to the right rear half-shaft. In this way, the second motor 52 can drive the first half-shaft 21, i.e., the left rear wheel axle, to rotate so that the left rear wheel 941 of the vehicle rotates, realizing rear-wheel drive, or the third motor 53 can drive the second half-shaft 22, i.e., the right rear wheel axle, to rotate so that the right rear wheel 942 of the vehicle rotates, realizing rear-wheel drive, or the second motor 52 and the third motor 53 can simultaneously drive the first half-shaft 21 and the second half-shaft 22 to rotate, that is, the second wheel axle 2, i.e., the rear wheel axle of the vehicle rotates, and then drive the two rear wheels to rotate, realizing rear-wheel drive. When the first motor 51, the second motor 52 and the third motor 53 are driven simultaneously, four-wheel drive is realized.

[0058] In some embodiments, as Figure 1As 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 the lateral direction of the vehicle, i.e., the left and right directions. 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 lateral arrangement also shortens the power transmission path from the first transmission shaft 63 to the front wheels 93, thereby improving the power transmission efficiency.

[0059] 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. In other words, when the first input shaft 61 rotates, it drives the first input gear 611 to rotate synchronously, when the first intermediate shaft 62 rotates, it drives the first intermediate gear 621 and the first transmission gear 622 to rotate, and when the first transmission shaft 63 rotates, it drives the first output gear 631 to rotate.

[0060] Furthermore, the first input shaft 61 is connected to the first motor 51 , 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 .

[0061] Specifically, if Figure 1 As shown, the motor shaft of the first motor 51 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 51 can provide power to drive the first input shaft 61 to rotate. When the first input shaft 61 rotates, it can drive the first input gear 611 to rotate. The first input gear 611, in turn, drives the first intermediate gear 621 meshed with it to rotate. When the first intermediate gear 621 rotates, it drives the first intermediate shaft 62 and the first transmission gear 622 to rotate. When the first transmission gear 622 rotates, it drives the first output gear 631 meshed with it, which in turn drives the first transmission shaft 63 to rotate, thereby achieving power transmission from the first motor 51 to the first transmission shaft 63.

[0062] In actual design, Figure 1As shown, the first transmission shaft 63 is power-connected to the first wheel axle 1 via the front transmission shaft 92 and the front differential 91. That is, the power of the first transmission shaft 63 can be transmitted to the front transmission shaft 92 and the front differential 91, and then to the first wheel axle 1, thereby achieving power connection and power transmission from the first transmission shaft 63 to the first wheel axle 1. The first transmission structure 6 can be disposed in the intermediate transfer case 95 to ensure stable transmission of the first transmission structure 6.

[0063] In some embodiments, there are multiple first input gears 611, that is, the number of first input gears 611 can be set to two, three, or even more. Providing multiple first input gears 611 allows the power of the first input shaft 61 to be transmitted to the first intermediate shaft 62 through the multiple first input gears 611, thereby improving the power transmission efficiency of the first input shaft 61. The multiple first input gears 611 are spaced apart along the axial direction of the first input shaft 61 to avoid interference between the first input gears 611, effectively utilize the axial space of the first input shaft 61, and enable each first input gear 611 to independently receive and transmit power.

[0064] There are multiple first intermediate gears 621, i.e., the number of first intermediate gears 621 can be two, three, or even more. Providing multiple first intermediate gears 621 allows the first intermediate shaft 62 to receive power from the first input shaft 61 through the multiple first intermediate gears 621 and transmit the power to the first transmission shaft 63, thereby improving the power transmission efficiency of the first intermediate shaft 62. The multiple first intermediate gears 621 mesh with the multiple first input gears 611 in a one-to-one correspondence, i.e., the number of first intermediate gears 621 and the position of the first input gears 611 are the same, and the positions correspond to each other. This allows each first input gear 611 to mesh with a first intermediate gear 621, forming multiple independent transmission paths. This improves both power transmission stability and transmission efficiency, and prevents interference between the various transmission paths.

[0065] The first intermediate gears 621 are loosely mounted outside the first intermediate shaft 62 and are suitable for being selectively fixed to the first intermediate shaft 62 , that is, the first intermediate gears 621 can rotate freely on the first intermediate shaft 62 and can be selectively fixed to the first intermediate shaft 62 through the synchronizer S1 .

[0066] Specifically, refer to the attached Figure 1As shown, two first input gears 611 and two first intermediate gears 621 are provided. The two first input gears 611 and the two first intermediate gears 621 mesh with each other in a one-to-one correspondence. The two first intermediate gears 621 are loosely mounted on the outside of the first intermediate shaft 62. A synchronizer S1 is provided between the two first intermediate gears 621. The synchronizer S1 can be engaged with any of the first intermediate gears 621 to fix one of the first intermediate gears 621 to the first intermediate shaft 62, thereby adjusting the gear number and achieving gear shifting. The figure shows two first input gears 611 and two first intermediate gears 621, that is, the figure illustrates a two-gear front axle. Other gear numbers can also be set, and can be flexibly selected according to actual needs.

[0067] In some embodiments, as Figure 1 As shown, the second transmission structure 7 includes a second intermediate shaft 71, the motor shaft of the second motor 52 is provided with a first motor 51 gear, the second intermediate shaft 71 is provided with a coaxially distributed second intermediate gear 711 and a third intermediate gear 712, the first motor gear 521 is meshed with the second intermediate gear 711, and the third intermediate gear 712 is power-connected to the first half shaft 21.

[0068] That is to say, the second motor 52 transmits power through the first motor gear 521 on the motor shaft. When the second motor 52 is running, the motor shaft rotates to drive the first motor gear 521 to rotate, and the first motor gear 521 rotates to drive the second intermediate gear 711 meshing with it to rotate. The power is transmitted from the first motor gear 521 to the second intermediate gear 711, and then when the second intermediate gear 711 rotates, it drives the second intermediate shaft 71 and the third intermediate gear 712 to rotate synchronously. When the third intermediate gear 712 rotates, it transmits power to the first half shaft 21, so that when the first half shaft 21 rotates, it can drive the left rear wheel 941 connected to it to rotate, thereby realizing efficient transmission of power from the second motor 52 to the left rear wheel 941.

[0069] In other embodiments, Figure 1 As shown, the third transmission structure 8 includes a third intermediate shaft 81, the motor shaft of the third motor 53 is provided with a second motor gear 531, the third intermediate shaft 81 is provided with a coaxially distributed fourth intermediate gear 812 and a fifth intermediate gear 813, the second motor gear 531 is meshed with the fourth intermediate gear 812, and the fifth intermediate gear 813 is power-connected to the second half shaft 22.

[0070] That is to say, the third motor 53 transmits power through the second motor gear 531 on the motor shaft. When the third motor 53 is running, the motor shaft rotates to drive the second motor gear 531 to rotate, and the second motor gear 531 rotates to drive the fourth intermediate gear 812 meshing with it to rotate. The power is transmitted from the second motor gear 531 to the fourth intermediate gear 812, and then when the fourth intermediate gear 812 rotates, it drives the third intermediate shaft 81 and the fifth intermediate gear 813 to rotate synchronously. When the fifth intermediate gear 813 rotates, it transmits power to the second half shaft 22, so that when the second half shaft 22 rotates, it can drive the right rear wheel 942 connected to it to rotate, thereby realizing efficient transmission of power from the second motor 52 to the right rear wheel 942.

[0071] In actual design, the second transmission structure 7 and the third transmission structure 8 can be arranged in the rear reduction box 96 to protect the second transmission structure 7 and the third transmission structure 8 and ensure stable transmission of the second transmission structure 7 and the third transmission structure 8.

[0072] In other embodiments, Figure 1 As shown, a differential lock S2 can also be provided between the first half-shaft 21 and the second half-shaft 22. That is, the differential lock S2 can be used to tightly lock the left rear wheel shaft and the right rear wheel shaft of the vehicle together, so that the first half-shaft 21 and the second half-shaft 22 rotate synchronously, thereby making the rotation speeds of the left rear wheel 941 and the right rear wheel 942 consistent, thereby losing the differential effect.

[0073] Therefore, in practice, when one of the rear wheels slips, the differential lock S2 can lock the first half-shaft 21 and the second half-shaft 22, so that the left rear wheel 941 and the right rear wheel 942 rotate synchronously, and the power on the slipping wheel is redistributed to the other wheel with grip, so that the left and right rear wheels of the vehicle can obtain balanced power output during driving, thereby maintaining the vehicle's driving stability and improving the vehicle's ability to escape from difficulties.

[0074] In actual design, the second transmission structure 7, the third transmission structure 8 and the differential lock S2 can be set in the rear reduction gearbox 96 to protect the second transmission structure 7, the third transmission structure 8 and the differential lock S2 from being affected by the external environment, thereby ensuring their normal operation.

[0075] The utility model also provides a vehicle.

[0076] The vehicle according to the embodiment of the present invention is provided with the power drive system 100 according to any one of the above embodiments.

[0077] Among them, the vehicle of this embodiment can be an off-road vehicle, a sedan, a pickup truck, an SUV, etc., and realizes pure electric two-wheel drive and extended-range two-wheel drive functions by adopting three motors, thereby realizing flexible and efficient vehicle drive. In the extended-range working condition, the range extender composed of the engine 3 and the generator 4 can provide additional electric energy for the vehicle. Compared with the traditional hybrid extended-range hybrid power system, the utility model highlights the pure electric driving function, reduces fuel consumption, and improves the fuel economy of the vehicle; through the rear dual-motor setting of the second motor 52 and the third motor 53, the first half shaft 21 and the second half shaft 22 can be driven to rotate separately, so that the left rear wheel 941 and the right rear wheel 942 can be driven to rotate separately, realizing the decoupling of the two rear wheels, and then realizing a leopard-like U-turn similar to the formula leopard, reducing the vehicle turning radius, and improving the vehicle's handling and performance.

[0078] In some embodiments, the engine 3 and the generator 4 are installed in the nacelle.

[0079] Specifically, if Figure 1 As shown, the engine 3 and the generator 4 are arranged at the front of the vehicle. In this way, the engine 3 and the generator 4, i.e., the range extender, can be installed in the engine compartment to ensure the normal operation of the engine 3 and the generator 4 and reduce the impact on the surrounding environment, which is convenient for maintenance and operation. The arrangement is longitudinal, that is, the engine 3 and the generator 4 are arranged in sequence along the front and rear directions. The generator 4 is arranged close to the first motor 51, which is conducive to transmitting electrical energy to the first motor 51. Of course, in practice, since the range extender does not directly participate in the driving, the engine 3 and the generator 4 can also be installed horizontally in the engine compartment. They can be flexibly arranged according to the space of the entire vehicle and are not limited to the description in this embodiment.

[0080] In other embodiments, the first motor 51 and the first transmission structure 6 are located under the vehicle floor.

[0081] Specifically, if Figure 1 As shown, the first motor 51 and the first transmission structure 6 are roughly located in the middle of the vehicle. The first motor 51 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 51 to directly drive the first wheel axle 1 through the first transmission structure 6.

[0082] In some embodiments, a differential lock S2 may also be provided on the front differential, which may be flexibly provided according to the actual needs of the vehicle.

[0083] The following is the power transmission path of the power drive system 100 of the present invention under different operating conditions:

[0084] (1) In pure electric front-wheel drive mode, the first motor 51 is driven independently. The power of the first motor 51 is transmitted to the first wheel axle 1 through the first transmission structure 6, and then transmitted to the front wheel 93 to drive the vehicle. The high gear or low gear can be selected through the synchronizer S1. The low gear combined with the differential lock can improve the low-speed off-road escape capability, and the high gear can ensure high speed while taking into account fuel economy.

[0085] (2) In the pure electric rear-wheel drive mode, one of the second motor 52 and the third motor 53 is driven independently or both are driven simultaneously. When the second motor 52 is driven independently, the power of the second motor 52 is transmitted to the first half-shaft 21 through the second transmission structure 7, and then to one rear wheel to drive the vehicle; when the third motor 53 is driven independently, the power of the third motor 53 is transmitted to the second half-shaft 22 through the third transmission structure 8, and then to the other rear wheel to drive the vehicle; when the second motor 52 and the third motor 53 are driven simultaneously, the power of both is transmitted to the entire second wheel axle 2 through the second transmission structure 7 and the third transmission structure 8, and then to the two rear wheels to drive the vehicle.

[0086] (3) In pure electric four-wheel drive operation, the first motor 51, the second motor 52 and the third motor 53 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 structure 8 respectively, and then transmitted to the front wheel 93 and the rear wheel to drive the vehicle. The synchronizer S1 can be adjusted to select the appropriate gear according to the driving conditions.

[0087] (4) In the extended-range front-wheel drive operating condition, the range extender works, that is, the generator 4 generates electricity and transmits the electric energy to the first motor 51, and the first motor 51 drives. The subsequent driving method is the same as the pure electric front-wheel drive operating condition.

[0088] (5) In the extended-range rear-wheel drive operating condition, the range extender works, that is, the generator 4 generates electricity and transmits the electric energy to the second motor 52 and one of the second motors 52, and the second motor 52 or the third motor 53 is driven, or the electric energy is transmitted to the second motor 52 and the third motor 53 at the same time, and the second motor 52 and the third motor 53 are driven at the same time. The subsequent driving method is the same as the pure electric rear-wheel drive operating condition.

[0089] (6) In the extended-range four-wheel drive operating condition, the range extender works, that is, the generator 4 generates electricity and transmits the electric energy to the first motor 51, the second motor 52 and the third motor 53. The first motor 51, the second motor 52 and the third motor 53 are driven simultaneously, and the subsequent driving mode is the same as the pure electric four-wheel drive operating condition.

[0090] (7) During the braking energy recovery operation, the vehicle recovers braking energy through the first motor 51, the second motor 52 and the third motor 53. That is, when the vehicle brakes, the first motor 51, the second motor 52 and the third motor 53 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 range, improve the vehicle's energy efficiency and reduce fuel consumption.

[0091] (8) In the reversing state, the reversing function can be achieved by controlling the reverse rotation of the first motor 51 or the second motor 52 and the third motor 53.

[0092] 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.

[0093] 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; 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 wheel axle includes a first half-shaft and a second half-shaft, the second motor is connected to the first half-shaft through a second transmission structure to drive the first half-shaft to rotate, and the third motor is connected to the second half-shaft through a third transmission structure to drive the second half-shaft to rotate.

2. The power drive system according to claim 1, characterized in that: Along the longitudinal direction of the vehicle, the generator, the first motor, and the second motor are sequentially spaced apart, or the generator, the first motor, and the third motor are sequentially spaced apart.

3. The power drive system according to claim 1, characterized in that: Along the longitudinal direction of the vehicle, the generator, the first motor, the second motor, and the third motor are all located between the first wheel axle and the second wheel axle.

4. The power drive system according to claim 3, characterized in that: In the transverse direction of the vehicle, the second transmission structure and the third transmission structure are distributed between the second motor and the third motor; and / or, the second motor and the third motor are symmetrically distributed with respect to the longitudinal direction of the vehicle; And / or, the second transmission structure and the third transmission structure are symmetrically distributed with respect to the longitudinal direction of the vehicle.

5. The power drive system according to any one of claims 1 to 4, characterized in that: 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.

6. The power drive system according to any one of claims 1 to 4, 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.

7. The power drive system according to claim 6, characterized in that: There are a plurality of first input gears, and the plurality of first input gears are spaced apart and distributed along the axial direction of the first input shaft; There are a plurality of first intermediate gears, and the plurality of first intermediate gears mesh with the plurality of first input gears in a one-to-one correspondence. The plurality of first intermediate gears are loosely sleeved outside the first intermediate shaft and are suitable for being selectively fixed to the first intermediate shaft.

8. The power drive system according to any one of claims 1 to 4, characterized in that: The second transmission structure includes a second intermediate shaft, the motor shaft of the second motor is provided with a first motor gear, the second intermediate shaft is provided with a second intermediate gear and a third intermediate gear distributed coaxially, the first motor gear is meshed with the second intermediate gear, and the third intermediate gear is power-connected to the first half-shaft; And / or, the third transmission structure includes a third intermediate shaft, the motor shaft of the third motor is provided with a second motor gear, the third intermediate shaft is provided with a fourth intermediate gear and a fifth intermediate gear distributed coaxially, the second motor gear is meshed with the fourth intermediate gear, and the fifth intermediate gear is dynamically connected to the second half-shaft.

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 the generator are installed in the nacelle; And / or, the first motor and the first transmission structure are located under the vehicle floor.

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