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 motor and the second wheel axle are coaxially arranged, the second motor is connected with a motor shaft, the motor shaft is arranged outside the second wheel axle in a sleeving mode, and the motor shaft is in power connection with the second wheel axle through a second transmission structure so as to drive the second wheel axle to rotate. According to the power driving system, the pure electric driving function is highlighted, oil consumption is reduced, meanwhile, the overall axial size of the rear electric bridge is shortened, the structural compactness is improved, the arrangement space of a battery pack or an oil tank 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 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 overall size of the rear electric axle 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, the utility model proposes a power drive system that enhances pure electric driving capabilities, reduces fuel consumption, and improves the vehicle's fuel economy, power performance, and maneuverability. At the same time, it shortens the overall axial dimension of the rear electric axle, improving structural compactness, increasing the space for the vehicle's battery pack or fuel tank, and improving range.

[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, the second motor is coaxially arranged with the second wheel axle, and the second motor is connected to a motor shaft, the motor shaft is sleeved outside the second wheel axle, and the motor shaft is connected to the second wheel axle through a second transmission structure for driving the second wheel axle to rotate.

[0006] According to the power drive system of the embodiment of the present invention, two motors are used 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 is coaxially arranged with the second wheel axle, and the motor shaft sleeve is arranged outside the second wheel axle, shortening the overall axial dimension of the rear electric axle, reducing the additional space occupied by the second motor, 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.

[0007] According to the power drive system of some embodiments of the present invention, the second transmission structure includes an intermediate transmission shaft, the motor shaft is provided with an active input gear, the intermediate transmission shaft is provided with a coaxially distributed intermediate transmission gear and an intermediate output gear, the active input gear is meshed with the intermediate transmission gear for transmission, and the intermediate output gear is dynamically connected to the second wheel axle.

[0008] According to the power drive system of some embodiments of the present invention, there are multiple active input gears and multiple intermediate transmission gears, and the multiple active input gears are matched with the multiple intermediate transmission gears in a one-to-one correspondence;

[0009] Among them, the plurality of intermediate transmission gears can be selectively connected to the intermediate transmission shaft in terms of power.

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

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

[0014] 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.

[0015] The utility model also provides a vehicle.

[0016] A vehicle according to an embodiment of the present invention is provided with a power drive system according to any one of the above embodiments.

[0017] In some embodiments, the engine and the generator are installed in a cabin; and / or the first motor and the first transmission structure are located under a vehicle floor.

[0018] 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.

[0019] 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

[0020] 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:

[0021] Figure 1 It is a schematic diagram of the principle of a power drive system according to an embodiment of the present utility model.

[0022] Reference numerals:

[0023] Power drive system 100,

[0024] First wheel axle 1, second wheel axle 2, first half axle 21, second half axle 22,

[0025] Engine 3, generator 4, first motor 5, second motor 6, motor shaft 61, active input gear 611,

[0026] First transmission structure 7, first input shaft 71, first input gear 711, first intermediate shaft 72, first intermediate gear 721, first transmission gear 722, first transmission shaft 73, first output gear 731,

[0027] The second transmission structure 8, the intermediate transmission shaft 81, the intermediate transmission gear 811, the intermediate output gear 812,

[0028] First differential 91, second differential 92, front drive shaft 93, front wheels 94, rear wheels 95, intermediate transfer case 97, rear reduction gearbox 98, synchronizer S1, synchronizer 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 1A 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.

[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 and a second wheel axle 2, an engine 3 and a generator 4, a first motor 5 and a second motor 6.

[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 94 , and the second wheel axle 2 is located at the rear of the vehicle and connected to the rear wheels 95 .

[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 5 and the second motor 6 are electric drive devices, that is, the first motor 5 and the second motor 6 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 at the same time.

[0038] Furthermore, the first motor 5 is power-connected to the first axle 1 via the first transmission structure 7 to drive the rotation of the first axle 1. Specifically, the first motor 5 can transmit power to the first axle 1 via the first transmission structure 7, achieving power transmission from the first motor 5 to the first axle 1. This allows the first motor 5 to drive the rotation of the first axle 1, which in turn drives the connected wheel. This enables electric propulsion of the vehicle, reducing fuel consumption and lowering fuel consumption.

[0039] Furthermore, the second motor 6 is coaxially arranged with the second wheel axle 2, and the second motor 6 is connected with a motor shaft 61, which is sleeved outside the second wheel axle 2. The motor shaft 61 is dynamically connected to the second wheel axle 2 through the second transmission structure 8 to drive the second wheel axle 2 to rotate.

[0040] Specifically, refer to the attached Figure 1 As shown, the second motor 6 is coaxially arranged with the second wheel axle 2, that is, the second motor 6 and the second wheel axle 2 are arranged together at the rear of the vehicle along the transverse direction of the vehicle, and the motor shaft 61 of the second motor 6 is sleeved outside the second wheel axle 2, so that the second motor 6 is sleeved outside the second wheel axle 2 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 6 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.

[0041] The motor shaft 61 is power-connected to the second wheel axle 2 via the second transmission structure 8 to drive the second wheel axle 2 in rotation. Specifically, the second motor 6 transmits power to the second wheel axle 2 via the second transmission structure 8, achieving power transmission from the second motor 6 to the second wheel axle 2. This allows the second motor 6 to rotate the second wheel axle 2, which in turn drives the connected wheel. This enables electric propulsion of the vehicle, further reducing fuel consumption and lowering fuel consumption.

[0042] 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), brake energy recovery operating conditions and reverse operating conditions (controlling the first motor 5 or the second motor 6 to reverse). (1) In the pure electric operating condition, the first motor 5 and the second motor 6 are driven independently, that is, one motor can be driven alone to rotate the first wheel axle 1 or the second wheel axle 2 to achieve the pure electric front-wheel drive operating condition or the pure electric rear-wheel drive operating condition, or the two motors can be driven simultaneously to rotate the first wheel axle 1 and the second wheel axle 2 to achieve the pure electric four-wheel drive operating condition. In this operating condition, 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 be driven independently with any motor to realize the extended-range front-wheel drive mode or the extended-range rear-wheel drive mode, or it can be driven simultaneously with the first motor 5 and the second motor 6 to realize 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 5 and the second motor 6 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 5 and the second motor 6, so that the first motor 5 and the second motor 6 can drive the first wheel axle 1 and the second wheel axle 2 to rotate. In this operating mode, the engine 3 does not directly drive the wheels, but provides electric energy to the first motor 5 and the second motor 6 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 5 and the second motor 6 recover braking energy when the vehicle brakes. That is, when the vehicle brakes, the first motor 5 and the second motor 6 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 5 or the second motor 6.

[0043] According to the power drive system 100 of the embodiment of the present invention, two motors are used 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 6 is coaxially arranged with the second wheel axle 2, and the motor shaft 61 is 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 6, 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.

[0044] In some embodiments, as Figure 1 As shown, the second transmission structure 8 includes an intermediate transmission shaft 81. The intermediate transmission shaft 81 and the motor shaft 61 are spaced apart and distributed in parallel along the longitudinal direction of the vehicle, i.e., the front-to-rear direction. The motor shaft 61 is sleeved outside the second wheel axle 2, and the intermediate transmission shaft 81 is located in front of the motor shaft 61. In this way, the space occupied by the second motor 6 is reduced, and the position of the intermediate transmission shaft 81 is reasonably set, so that the intermediate transmission shaft 81 is close to the motor shaft 61 and the second wheel axle 2, which is conducive to efficient power transmission.

[0045] The motor shaft 61 is provided with a driving input gear 611, and the intermediate transmission shaft 81 is provided with a coaxially distributed intermediate transmission gear 811 and intermediate output gear 812. Specifically, rotation of the motor shaft 61 drives the driving input gear 611 to rotate synchronously, and rotation of the intermediate shaft drives the intermediate transmission gear 811 and intermediate output gear 812 to rotate. Thus, the arrangement of the motor shaft 61 sleeved outside the second wheel axle 2 reduces the space occupied by the driving input gear 611, further shortening the axial dimension of the rear electric axle.

[0046] Furthermore, the active input gear 611 is meshed with the intermediate transmission gear 811 for transmission, and the intermediate output gear is connected to the second wheel axle 2 for power.

[0047] Specifically, if Figure 1 As shown, the active input gear 611 is meshed with the intermediate transmission gear 811, and the intermediate output gear 812 is connected to the second wheel axle 2 by power. In this way, when the actual second motor 6 is driven to drive the active input gear 611 to rotate, the rotation of the active input gear 611 can drive the intermediate transmission gear 811 meshed with it to rotate, and then the intermediate transmission gear 811 rotates to drive the intermediate transmission shaft 81 and the intermediate output gear 812 to rotate, and then the intermediate output gear 812 rotates to drive the second wheel axle 2 to rotate, thereby realizing power transmission from the second motor 6 to the second wheel axle 2.

[0048] In some embodiments, there are multiple active input gears 611 and intermediate transmission gears 811, that is, the number of active input gears 611 and intermediate transmission gears 811 can be set to two, three or even more. Setting multiple active input gears 611 and multiple intermediate transmission gears 811 can enable the power of the second motor 6 to be transmitted to multiple intermediate transmission gears 811 through multiple active input gears 611, and then to the intermediate transmission shaft 81, thereby improving the power transmission efficiency between the second motor 6 and the intermediate transmission shaft 81, and the rotational speeds of the multiple intermediate transmission gears 811 can be different, thereby achieving adjustment of different gear numbers.

[0049] Moreover, the multiple active input gears 611 are matched with the multiple intermediate transmission gears 811 in a one-to-one correspondence, that is, the number of active input gears 611 and the intermediate transmission gears 811 are the same and the positions correspond to each other, so that each active input gear 611 can be meshed with an intermediate transmission gear 811 to form multiple independent transmission paths, which not only improves the power transmission stability, but also improves the power transmission efficiency, and the various transmission paths do not interfere with each other.

[0050] Furthermore, multiple intermediate transmission gears 811 can be selectively connected to the intermediate transmission shaft 81 in terms of power, that is, multiple intermediate transmission gears 811 can rotate freely on the intermediate transmission shaft 81 to be connected to the intermediate transmission shaft 81 in terms of power. In other words, when the multiple intermediate transmission gears 811 rotate, they can drive the intermediate transmission shaft 81 to rotate, thereby transmitting power to the intermediate transmission shaft 81. They can also be fixedly connected to the intermediate transmission shaft 81, that is, they cannot rotate freely on the intermediate transmission shaft 81 to disconnect the power connection with the intermediate transmission shaft 81, and cannot transmit power to the intermediate transmission shaft 81.

[0051] Reference Attachment Figure 1 As shown, the synchronizer S2 can be used to achieve selective power connection between multiple intermediate transmission gears 811 and the intermediate transmission shaft 81. That is, when the synchronizer S2 is engaged with one of the intermediate transmission gears 811, this intermediate transmission gear 811 is fixedly connected to the intermediate transmission shaft 81 and cannot rotate. When the synchronizer S2 is not engaged with the intermediate transmission gear 811, the intermediate transmission gear 811 is power-connected to the intermediate transmission shaft 81.

[0052] Specifically, refer to the attached Figure 1 As shown, two intermediate transmission gears 811 and two active input gears 611 are provided. The two active input gears 611 and the two intermediate transmission gears 811 mesh with each other in a one-to-one correspondence, and a synchronizer S2 is provided between the two intermediate transmission gears 811. The synchronizer S2 can be arbitrarily combined with one of the intermediate transmission gears 811 to fix one of the intermediate transmission gears 811 to the intermediate transmission shaft 81, disconnecting the power connection. The other intermediate transmission gear 811 can rotate relative to the intermediate transmission shaft 81 to achieve power connection, thereby adjusting the number of gears and achieving gear shifting. The figure shows two intermediate transmission gears 811 and two active input gears 611, that is, the rear axle is shown in the figure as having two gears for illustration, but it can also be set to other gear numbers and can be flexibly selected according to actual needs.

[0053] In some embodiments, the second wheel axle 2 includes a first half-shaft 21 and a second half-shaft 22 , a first differential 91 is connected between the first half-shaft 21 and the second half-shaft 22 , and the intermediate output gear 812 is power-connected to the first differential 91 .

[0054] Specifically, if Figure 1As 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. A first differential 91 is connected between the first half-shaft 21 and the second half-shaft 22. The intermediate output gear 812 is power-connected to the first differential 91, that is, the power of the intermediate output gear 812 can be transmitted to the first differential 91, and the differential action of the first differential 91 makes the first half-shaft 21 and the second half-shaft 22 rotate at different speeds, thereby making the left and right rear wheels rotate at different speeds, thereby ensuring the driving stability of the vehicle when turning or on uneven roads.

[0055] In some embodiments, the second motor 6 and the first differential 91 are spaced apart and distributed along the axial direction of the second wheel axle 2 , and the motor shaft 61 is located between the second motor 6 and the first differential 91 .

[0056] Specifically, if Figure 1 As shown, the second motor 6 and the first differential 91 are spaced apart along the axial direction of the second wheel axle 2. The second motor 6 is shown on the left side, and the first differential 91 is on the right side. However, the second motor 6 can also be positioned on the left side, and the first differential 91 on the right side. This is merely an example. The motor shaft 61 is positioned between the second motor 6 and the first differential 91 to facilitate connection with the second transmission structure 8. This helps shorten the axial dimension of the rear electric axle and the power transmission path, thereby improving power transmission efficiency while increasing space for other structural components.

[0057] In actual design, the second transmission structure 8 and the first differential 91 can be arranged in the rear reduction gearbox 98 to protect the second transmission structure 8 and the first differential 91 and ensure stable transmission of the second transmission structure 8 and the first differential 91.

[0058] In some embodiments, along the longitudinal direction of the vehicle, the intermediate transmission shaft 81 is located between the first wheel axle 1 and the second wheel axle 2 .

[0059] That is, in the front-rear direction of the vehicle, the intermediate transmission shaft 81 is located between the first wheel axle 1 and the second wheel axle 2. Figure 1 As shown, the first wheel axle 1, the intermediate transmission shaft 81 and the second wheel axle 2 are distributed in sequence along the front and rear directions. The intermediate transmission shaft 81 is located on the front side of the second wheel axle 2 and the rear side of the first wheel axle 1, that is, between the first wheel axle 1 and the second wheel axle 2, and is arranged close to the second wheel axle 2.

[0060] Such an arrangement allows the various shafts 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 intermediate transmission shaft 81 is close to the second wheel axle 2, which is conducive to the power of the second motor 6 being quickly and efficiently transmitted to the second wheel axle 2 through the intermediate transmission shaft 81.

[0061] In some embodiments, along the longitudinal direction of the vehicle, the first motor 5 and the first transmission structure 7 are both located between the first wheel axle 1 and the second wheel axle 2 .

[0062] That is, the first motor 5 and the first transmission structure 7 are located between the first wheel axle 1 and the second wheel axle 2 in the front-rear direction of the vehicle. Figure 1 As shown, the first motor 5 and the first transmission structure 7 are located on the rear side of the first wheel axle 1 and the front side of the second wheel axle 2 .

[0063] Such an arrangement can make full use of 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 the weight is more evenly distributed on the first wheel axle 1 and the second wheel axle 2 of the vehicle, thereby improving the stability and balance of the vehicle. At the same time, the first motor 5 and the first transmission structure 7 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 make it easier to cooperate with the range extender, namely the engine 3 and the generator 4, thereby improving driving efficiency.

[0064] 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.

[0065] 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 94. In this way, the first motor 5 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 6 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 5 and the second motor 6 are driven at the same time, four-wheel drive is realized.

[0066] In some embodiments, as Figure 1As shown, the first transmission structure 7 includes a first input shaft 71, a first intermediate shaft 72 and a first transmission shaft 73. The first input shaft 71, the first intermediate shaft 72 and the first transmission shaft 73 are spaced apart and distributed in parallel along the lateral direction of the vehicle, i.e., the left and right directions. The first intermediate shaft 72 is located between the first input shaft 71 and the first transmission shaft 73. In this way, the bottom space of the vehicle can be fully utilized to arrange the first transmission structure 7 to avoid interference between the various shafts. At the same time, the lateral arrangement of the various shafts also shortens the power transmission path from the first transmission shaft 73 to the front wheels 94, thereby improving the power transmission efficiency.

[0067] like Figure 1 As shown, the first input shaft 71 is provided with a first input gear 711, the first intermediate shaft 72 is provided with a coaxially distributed first intermediate gear 721 and a first transmission gear 722, and the first transmission shaft 73 is provided with a first output gear 731. In other words, when the first input shaft 71 rotates, it drives the first input gear 711 to rotate synchronously, when the first intermediate shaft 72 rotates, it drives the first intermediate gear 721 and the first transmission gear 722 to rotate, and when the first transmission gear 722 rotates, it drives the first output gear 731 to rotate.

[0068] Furthermore, the first input shaft 71 is connected to the first motor 5 , and the first transmission shaft 73 is connected to the first wheel axle 1 , the first input gear 711 is meshed with the first intermediate gear 721 , and the first transmission gear 722 is meshed with the first output gear 731 .

[0069] Specifically, if Figure 1 As shown, the motor shaft of the first motor 5 is connected to the first input shaft 71, the first input gear 711 is meshed with the first intermediate gear 721, and the first transmission gear 722 is meshed with the first output gear 731. Thus, the first motor 5 can provide power to drive the first input shaft 71 to rotate. When the first input shaft 71 rotates, it can drive the first input gear 711 to rotate. The first input gear 711, in turn, drives the first intermediate gear 721 meshed with it to rotate. When the first intermediate gear 721 rotates, it drives the first intermediate shaft 72 and the first transmission gear 722 to rotate. When the first transmission gear 722 rotates, it drives the first output gear 731 meshed with it, which in turn drives the first transmission shaft 73 to rotate, thereby achieving power transmission from the first motor 5 to the first transmission shaft 73.

[0070] In actual design, Figure 1As shown, the first drive shaft 73 can be power-connected to the first wheel axle 1 via the front drive shaft 93 and the second differential 92. That is, the power of the first drive shaft 73 can be transmitted to the front drive shaft 93 and the second differential 92, and then to the first wheel axle 1, thereby achieving power connection and power transmission from the first drive shaft 73 to the first wheel axle 1. The differential action of the second differential 92 can also enable the front left and right wheels to rotate at different speeds. The first transmission structure 7 can also be disposed in the intermediate transfer case 97 to ensure stable transmission of the first transmission structure 7.

[0071] The utility model also provides a vehicle.

[0072] 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.

[0073] 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 two motors, thereby realizing flexible and efficient vehicle drive. 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 vehicle's fuel economy, power performance and handling; at the same time, the second motor 6 is coaxially arranged with the second wheel axle 2, and the motor shaft 61 is 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 6, 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.

[0074] In some embodiments, the engine 3 and the generator 4 are installed in the nacelle.

[0075] 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 5, which is conducive to transmitting electrical energy to the first motor 5. 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.

[0076] In other embodiments, the first motor 5 and the first transmission structure 7 are located under the vehicle floor.

[0077] Specifically, refer to Figure 1As shown, the first motor 5 and the first transmission structure 7 are roughly located in the middle of the vehicle. The first motor 5 and the first transmission structure 7 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 5 to directly drive the first wheel axle 1 through the first transmission structure 7.

[0078] In some embodiments, a differential lock may be provided on the first differential 91 or the second differential 92 , or a differential lock may be provided on both the first differential 91 and the second differential 92 , and the differential lock may be flexibly provided according to the actual needs of the vehicle.

[0079] The following is the power transmission path of the power drive system 100 of the present invention under different operating conditions:

[0080] (1) In pure electric front-wheel drive mode, the first motor 5 is driven independently. The power of the first motor 5 is transmitted to the first wheel axle 1 through the first transmission structure 7, 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 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.

[0081] (2) In pure electric rear-wheel drive mode, the second motor 6 is driven independently, and the power of the second motor 6 is transmitted to the second wheel axle 2 through the second transmission structure 8, and then transmitted to the rear wheel 95 to drive the vehicle. The high gear or low gear can be selected through the synchronizer S2. 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.

[0082] (3) In pure electric four-wheel drive operation, the first motor 5 and the second motor 6 are driven simultaneously, and their power is transmitted to the first wheel axle 1 and the first wheel axle 1 through the first transmission structure 7 and the second transmission structure 8 respectively, and then transmitted to the front wheels 94 and the rear wheels 95 to drive the vehicle. The synchronizer S1 and the synchronizer S2 can be adjusted to select the appropriate gear according to the driving conditions.

[0083] (4) In the extended-range front-wheel drive mode, the range extender works, that is, the generator 4 generates electricity and transmits the electric energy to the first motor 5, which drives the first motor 5. The subsequent driving method is the same as the pure electric front-wheel drive mode.

[0084] (5) In the extended-range rear-wheel drive mode, the range extender works, that is, the generator 4 generates electricity and transmits the electric energy to the second motor 6, which drives the second motor 6. The subsequent driving method is the same as the pure electric rear-wheel drive mode.

[0085] (6) In the extended-range four-wheel drive mode, the range extender works, that is, the generator 4 generates electricity and transmits the electric energy to the first motor 5 and the second motor 6. The first motor 5 and the second motor 6 are driven simultaneously, and the subsequent driving mode is the same as the pure electric four-wheel drive mode.

[0086] (7) During the braking energy recovery operation, the vehicle recovers braking energy through the first motor 5 and the second motor 6. That is, when the vehicle brakes, the first motor 5 and the second motor 6 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.

[0087] (8) In the reversing state, the reversing function can be achieved by controlling the reverse rotation of the first motor 5 or the second motor 6.

[0088] 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.

[0089] 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 is coaxially arranged with the second wheel axle, and the second motor is connected to a motor shaft, the motor shaft is sleeved outside the second wheel axle, and the motor shaft is dynamically connected to the second wheel axle through a second transmission structure to drive the second wheel axle to rotate.

2. The power drive system according to claim 1, characterized in that: The second transmission structure includes an intermediate transmission shaft, the motor shaft is provided with a driving input gear, the intermediate transmission shaft is provided with a coaxially distributed intermediate transmission gear and an intermediate output gear, the driving input gear is meshed with the intermediate transmission gear for transmission, and the intermediate output gear is dynamically connected to the second wheel axle.

3. The power drive system according to claim 2, characterized in that: There are multiple active input gears and multiple intermediate transmission gears, and the multiple active input gears are matched with the multiple intermediate transmission gears in a one-to-one correspondence; Among them, the plurality of intermediate transmission gears can be selectively connected to the intermediate transmission shaft in terms of power.

4. The power drive system according to claim 2, characterized in that: The second wheel axle includes a first half-shaft and a second half-shaft, a first differential is connected between the first half-shaft and the second half-shaft, and the intermediate output gear is power-connected to the first differential.

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

6. The power drive system according to claim 2, characterized in that: The intermediate transmission shaft is located between the first wheel axle and the second wheel axle in the longitudinal direction of the vehicle.

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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