An electric drive axle and a motor vehicle

Abstract

The application discloses an electric drive axle and a motor vehicle, wherein the electric drive axle comprises a power mechanism, a first reduction mechanism, a first gear shifting mechanism, a second reduction mechanism, a second gear shifting mechanism, a first planetary gear train, a first intermediate shaft, a second intermediate shaft and a main shaft. The electric drive axle disclosed by the scheme increases the second intermediate shaft, the second reduction mechanism and the second gear shifting mechanism, realizes three-stage reduction, and meets the demand of heavy truck large torque. Meanwhile, the second gear shifting mechanism is additionally arranged on the main shaft, the cooperation of the second gear shifting mechanism, the second reduction mechanism and the first planetary gear train realizes two-gear shifting, and the first gear shifting mechanism is additionally arranged, so that the electric drive axle has four gears. Compared with the related art which increases a complete transmission system to realize the increase of gears, the overall volume of the electric drive axle is reduced, thereby solving the problem that the increase of gears causes the electric drive axle to occupy a large space, and the increase of gears improves the flexibility of speed regulation.

Description

Technical Field

[0001] This application relates to the field of motor vehicle technology, and in particular to an electric drive axle and a motor vehicle. Background Technology

[0002] Heavy-duty truck electric drive axles have high torque requirements. Related technologies, such as... Figure 1 As shown, the transmission system of the electric drive bridge includes a first reduction mechanism 01, an output gear 02, and a planetary gear set 03. The first reduction mechanism 01 includes a first driving gear 011, a second driving gear 012, a first driven gear 013, a second driven gear 014, an input shaft 015, and an intermediate shaft 016. The output shaft of the motor 04 is connected to the input shaft 015. The first driving gear 011 and the second driving gear 012 are arranged side by side on the input shaft 015. The first driven gear 013 and the second driven gear 014 are arranged on the intermediate shaft 01. The first driven gear 013 meshes with the first driving gear 011, and the second driven gear 014 meshes with the second driving gear 012. The intermediate shaft 016 is connected to the planetary gear set 03 through the output gear 02. A shifting mechanism 05 with two gears is provided on the intermediate shaft 016.

[0003] The electric drive axle in the relevant technology can only achieve two-speed transmission, which is limited and lacks flexibility. In addition, if more speeds are to be added, a transmission system as described above is added around the spindle 06, which results in the electric drive axle occupying a large space. Utility Model Content

[0004] This application proposes an electric drive axle to increase the number of gears, improve maneuverability, and reduce space occupation. This application also proposes a motor vehicle having the aforementioned electric drive axle.

[0005] To achieve the above objectives, this application provides an electric drive axle, including a power mechanism, a first reduction mechanism, a first shifting mechanism, a second reduction mechanism, a second shifting mechanism, a first planetary gear train, a first intermediate shaft, a second intermediate shaft, and a main shaft; the power mechanism is connected to the input end of the first reduction mechanism, and the output end of the first reduction mechanism is connected to one of the first intermediate shaft and the second intermediate shaft; the first shifting mechanism includes a first shifter and a first shift gear mounted on the first intermediate shaft, the first shift gear engaging with the first intermediate shaft through the first shifter; the second intermediate shaft includes transmission gears corresponding one-to-one with the first shift gears, the input end of the second reduction mechanism is connected to the other of the first intermediate shaft and the second intermediate shaft, and the output end of the second reduction mechanism is rotatably mounted on the main shaft; the second shifting mechanism includes a second shifter, a second shift gear, and a third shift gear, the second shift gear being connected to the output end of the second reduction mechanism, the third shift gear being connected to the sun gear of the first planetary gear train, and the second shifter being connected to the planet carrier of the first planetary gear train.

[0006] Optionally, in the above-mentioned electric drive bridge, the power mechanism includes a motor; or, the power mechanism includes at least two motors, each of which has an input terminal of the first reduction mechanism at its output terminal, and the at least two input terminals share the output terminal of the first reduction mechanism.

[0007] Optionally, in the above-mentioned electric drive bridge, the first reduction mechanism is at least one of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism; the second reduction mechanism is at least one of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism.

[0008] Optionally, in the above-mentioned electric drive axle, the first planetary gear train is an NGW planetary gear set.

[0009] Optionally, in the above-mentioned electric drive axle, the spindle further includes a first differential, and the planetary carrier is connected to the spindle through the first differential.

[0010] Optionally, in the above-mentioned electric drive bridge, the electric drive bridge is a parallel axis electric drive bridge.

[0011] Secondly, this application also provides a motor vehicle, including two electric drive axles, both of which are the electric drive axles described in any of the above-mentioned solutions.

[0012] Optionally, in the above-mentioned motor vehicle, one of the two electric drive axles includes one motor, and the other of the two electric drive axles includes two motors; or, both of the two electric drive axles include two motors; or, both of the two electric drive axles include one motor.

[0013] Optionally, in the above-mentioned motor vehicle, at least one main shaft connected to the electric drive axle is provided with a wheel-side reduction mechanism.

[0014] Optionally, in the aforementioned motor vehicle, the electric drive axle is located on a first side of the main shaft, the first side being in the opposite direction to the vehicle's forward direction.

[0015] This application provides an electric drive axle, including a power mechanism, a first reduction mechanism, a first shifting mechanism, a second reduction mechanism, a second shifting mechanism, a first planetary gear train, a first intermediate shaft, a second intermediate shaft, and a main shaft. The electric drive axle disclosed in this solution adds a second intermediate shaft, a second reduction mechanism, and a second shifting mechanism, achieving three-stage reduction to meet the high torque requirements of heavy-duty trucks. Simultaneously, the second shifting mechanism is added to the main shaft, and its cooperation with the second reduction mechanism and the first planetary gear train enables two-speed shifting. Combined with the first shifting mechanism, the drive axle has four gears. Compared to related technologies that add an entire transmission system to increase the number of gears, this reduces the overall size of the electric drive axle, thus solving the problem of large space occupation caused by increasing the number of gears. Furthermore, the increased number of gears improves the flexibility of speed adjustment.

[0016] This application also discloses a motor vehicle including two electric drive axles, which are the electric drive axles disclosed in any of the above-described solutions. Since the electric drive axle has the aforementioned technical effects, the motor vehicle having this electric drive axle also has the same technical effects, and will not be elaborated further here. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0018] Figure 1 This is a schematic diagram of the structure of the electric drive bridge in the relevant technology;

[0019] Figure 2 This is a schematic diagram of the structure of the dual-motor electric drive bridge provided in the first embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the single-motor electric drive bridge provided in the first embodiment of this application;

[0021] Figure 4This is a schematic diagram of the structure of the dual-motor electric drive bridge provided in the second embodiment of this application.

[0022] in:

[0023] 01-First reduction gear; 011-First drive gear; 012-Second drive gear; 013-First driven gear; 014-Second driven gear; 015-Input shaft; 016-Intermediate shaft; 02-Output gear; 03-Planetary gear set; 04-Motor; 05-Shifting mechanism; 06-Main shaft;

[0024] 1-Power mechanism; 2-First reduction mechanism; 3-First shifting mechanism; 31-First shifter; 32-First shift gear; 4-Second reduction mechanism; 5-Second shifting mechanism; 51-Second shifter; 52-Second shift gear; 53-Third shift gear; 6-First planetary gear train; 7-First intermediate shaft; 8-Second intermediate shaft; 81-Transmission gear; 9-Main shaft; 10-Differential gear. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0026] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0028] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0029] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0030] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] In one aspect, this application discloses an electric drive axle, including a power mechanism 1, a first reduction mechanism 2, a first shifting mechanism 3, a second reduction mechanism 4, a second shifting mechanism 5, a first planetary gear train 6, a first intermediate shaft 7, a second intermediate shaft 8, and a main shaft 9.

[0032] The power mechanism 1 is used to provide power, and optionally, the power mechanism 1 includes an electric motor.

[0033] The power mechanism 1 is connected to the input end of the first reduction mechanism 2, and the first reduction mechanism 2 is used to output the power of the power mechanism 1.

[0034] The input end of the first reduction mechanism 2 is connected to the power mechanism 1, and the output end of the first reduction mechanism 2 is connected to one of the first intermediate shaft 7 and the second intermediate shaft 8; the input end of the second reduction mechanism 4 is connected to the other of the first intermediate shaft 7 and the second intermediate shaft 8, and the output end of the second reduction mechanism 4 is rotatably mounted on the main shaft 9.

[0035] It should be noted that the output end of the second reduction mechanism 4, which is rotatably mounted on the main shaft 9, is loosely fitted on the main shaft 9. The output end of the second reduction mechanism 4 can rotate freely on the main shaft 9. The rotation of the output end of the second reduction mechanism 4 and the rotation of the main shaft 9 are independent of each other and do not affect each other.

[0036] A first shifting mechanism is mounted on the first intermediate shaft 7, and a transmission gear 81 that meshes with the first shifting gear of the first shifting mechanism is mounted on the second intermediate shaft 8. The positions of the first intermediate shaft 7 and the second intermediate shaft 8 can be interchanged to suit the needs of different vehicle models.

[0037] The first shifting mechanism 3 includes a first shifter 31 and a first shift gear 32. The first shifter 31 is slidably mounted on the first intermediate shaft 7, and the first shift gear 32 is rotatably mounted on the first intermediate shaft 7. The first shift gear 32 is rotatably mounted on the first intermediate shaft 7 in a loosely fitted manner, allowing it to rotate freely on the first intermediate shaft 7. The rotation of the first shift gear 32 and the rotation of the first intermediate shaft 7 are independent of each other and do not affect each other.

[0038] The number of the first shift mechanism, including the first shifter and the first shift gear, is set according to the shifting requirements. For example... Figure 2 , Figure 3 and Figure 4 As shown, the first shifting mechanism includes a first shifter and two first shift gears. The first shifter is located between the two first shift gears and engages with one of the first shift gears to achieve gear shifting.

[0039] Optionally, multiple first shift gears can be arranged side by side on the first intermediate shaft 7, with two first shift gears sharing one first shifter to achieve more gears.

[0040] The first shifting mechanism 3 is not limited to the first shifter cooperating with the first shift gear, but can also be other structures capable of shifting, all of which are within the protection scope of this application.

[0041] The second intermediate shaft 8 is provided with transmission gears 81 that correspond one-to-one with the first shift gear 32. The number of teeth of the transmission gears 81 at different positions on the second intermediate shaft 8 is different. Optionally, the number of teeth of different first shift gears 32 is also different. The first shift gears 32 mesh with the transmission gears 81 to achieve different transmission ratios.

[0042] The second shifting mechanism 5 includes a second shifter 51, a second shift gear 52, and a third shift gear 53. The second shift gear 52 is connected to the output end of the second reduction mechanism 4, the third shift gear 53 is connected to the sun gear of the first planetary gear train 6, and the second shifter 51 is connected to the planet carrier of the first planetary gear train 6.

[0043] The second shifter 51 engages with the second shift gear 52. The power at the output end of the second reduction mechanism 4 is transmitted to the planet carrier of the first planetary gear train 6 through the second shift gear 52 and the second shifter 51. The planet carrier is fixedly connected to the sun gear as a power input, and the planet carrier is connected to the main shaft 9 as an output.

[0044] The second shifter 51 engages with the third shifter 53, the planetary carrier is grounded, the sun gear of the first planetary gear train 6 serves as the power input, and the planetary carrier serves as the output connected to the main shaft 9.

[0045] The electric drive axle disclosed in this solution includes a first shifting mechanism 3 and a second shifting mechanism 5. The first shifting mechanism 3 and the second shifting mechanism 5 cooperate to achieve at least four gears. Compared with related technologies, this increases the number of gears, improves the flexibility of speed adjustment, and can meet different power output requirements. The dynamics and economics are also better. This solution increases the number of gears by adding a second shifting mechanism 5 on the main shaft 9 without having to add an entire transmission system to achieve the same increase in gears. This reduces the size of the electric drive axle and solves the problem of the electric drive axle occupying a large space due to the increase in gears.

[0046] Optionally, the power mechanism 1, the first reduction mechanism 2, the first shift mechanism 3, the second reduction mechanism 4, the second shift mechanism 5, the first intermediate shaft 7, the second intermediate shaft 8, and the main shaft 9 are all located on the same side of the main shaft 9 and on the X-direction side of the main shaft 9, without occupying the space on the X+direction side of the main shaft 9, leaving sufficient space in the X+ direction of the vehicle to facilitate the placement of the power battery.

[0047] It should be noted here that the X direction is the direction in which the car is moving, X+ is along the direction in which the car is moving, and X- is against the direction in which the car is moving.

[0048] The first intermediate shaft 7 and the second intermediate shaft 8 are located between the first reduction mechanism 2 and the second reduction mechanism 4, and their positions can be interchanged. Specifically, the output end of the first reduction mechanism 2 is connected to the first intermediate shaft 7, and the input end of the second reduction mechanism 4 is connected to the second intermediate shaft 8. The power of the power mechanism 1 is transmitted to the main shaft 9 sequentially through the first reduction mechanism 2, the first intermediate shaft 7, the first shifting mechanism 3, the transmission gear 81, the second intermediate shaft 8, the second reduction mechanism 4, and the first planetary gear train 6. The output end of the first reduction mechanism 2 is connected to the second intermediate shaft 8, and the input end of the second reduction mechanism 4 is connected to the first intermediate shaft 7 and the second intermediate shaft 8. The power of the power mechanism 1 is transmitted to the main shaft 9 sequentially through the first reduction mechanism 2, the second intermediate shaft 8, the transmission gear 81, the first shifting mechanism 3, the first intermediate shaft 7, the second reduction mechanism 4, and the first planetary gear train 6.

[0049] The first reduction mechanism 2 is at least one of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism; the second reduction mechanism 4 is at least one of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism.

[0050] The first reduction mechanism 2 may include only a cylindrical gear reduction mechanism or a planetary gear reduction mechanism, or it may be a combination of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism.

[0051] The second reduction mechanism 4 may consist of only a cylindrical gear reduction mechanism or a planetary gear reduction mechanism, or it may be a combination of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism.

[0052] like Figure 2 , Figure 3 and Figure 4 As shown, this is an embodiment where the first reduction mechanism 2 is a cylindrical gear reduction mechanism and the second reduction mechanism 4 is a cylindrical gear reduction mechanism. The first reduction mechanism 2 includes a first gear and a second gear. The first gear is connected to the output shaft of the power mechanism 1, and the second gear is connected to one of the first intermediate shaft 7 and the second intermediate shaft 8. The first gear and the second gear mesh.

[0053] The second reduction mechanism 4 includes a third gear and a fourth gear. The third gear is connected to the second gear through another of the first intermediate shaft 7 and the second intermediate shaft 8, and the third gear meshes with the fourth gear.

[0054] In the above embodiments, the first reduction mechanism 2 and the second reduction mechanism 4 have simple structures and high transmission efficiency, which can reduce the volume of the electric drive bridge and reduce the space occupied by the electric drive bridge to a certain extent.

[0055] Optionally, the first planetary gear train 6 is an NGW planetary gear set (internal meshing (N) - common planetary gear (G) - external meshing (W) planetary gear reducer), in which one planetary gear (G) simultaneously engages externally (W) with the central sun gear and internally (N) with the peripheral internal gear ring. Internal meshing refers to the meshing method between the planetary gear and the internal gear ring; common planetary gear refers to the same planetary gear participating in both meshing methods simultaneously, with the outer side of the planetary gear meshing externally with the sun gear and the inner side of the planetary gear meshing internally with the internal gear ring; external meshing refers to the meshing method between the sun gear and the planetary gears.

[0056] The NGW planetary gear set has the advantages of compact structure, high transmission efficiency, and large transmission ratio.

[0057] To further optimize the above technical solution, the planetary carrier is connected to the main shaft 9 via a differential 10. The differential allows the drive wheels located at both ends of the main shaft 9 to rotate at different speeds to adapt to cornering or uneven road surfaces, ensuring that the vehicle can turn smoothly and improving the vehicle's steering and braking performance.

[0058] The electric drive axle is a parallel-axis electric drive axle. The output shaft axis of the power mechanism 1 of the parallel-axis electric drive axle is parallel to the axis of the main shaft 9 (also called the half-shaft). The parallel-axis electric drive axle has high transmission efficiency and high integration, freeing up chassis space and providing space for the chassis to accommodate a large-capacity power battery.

[0059] The power mechanism 1 of the electric drive axle may include one motor or at least two motors.

[0060] In embodiments where the power mechanism 1 includes at least two motors, such as Figure 2 , Figure 3 and Figure 4 As shown, each motor's output shaft is equipped with a first gear, and a second gear is installed on the first intermediate shaft 7. The first gear of each motor meshes with the second gear; or, each motor's output end is equipped with an output gear, and each motor's output gear shares a first reduction mechanism 2.

[0061] At least two motors are located on the same side of the electric drive bridge, the motor power is combined, multiple sets of gears can be shared, the number of transmission gears is reduced, and the weight is light and the layout is compact.

[0062] Taking the diagram as an example, the shifting process is explained as follows: For ease of subsequent description, the two motors are named Motor A and Motor B, respectively. The first shifting mechanism 3 includes two first shifting gears 32, which are named First Shifting Gear A and First Shifting Gear B, respectively. The transmission gear 81 that meshes with the first shifting gear A is named Transmission Gear A, and the transmission gear 81 that meshes with the first shifting gear B is named Transmission Gear B.

[0063] First gear:

[0064] The first shifter 31 engages with the first shift gear A, and the second shifter 51 engages with the second shift gear 52;

[0065] The power of motors A and B is output through the first reduction mechanism 2 and transmitted to the first intermediate shaft 7 to achieve first-stage reduction.

[0066] The power of the first intermediate shaft 7 is transmitted to the first shift gear A through the first shifter 31. The first shift gear A meshes with the transmission gear A and transmits the power to the second intermediate shaft 8.

[0067] The second intermediate shaft 8 transmits power to the second reduction mechanism 4;

[0068] The power of the second reduction mechanism 4 is transmitted to the planet carrier of the first planetary gear train 6 through the second shift gear 52 and the second shifter 51. The planet carrier is fixedly connected to the sun gear and serves as the power input.

[0069] The planetary carrier transmits power to the main shaft 9 via the differential.

[0070] Second gear:

[0071] The first shifter 31 engages with the first shift gear B, and the second shifter 51 engages with the second shift gear 52.

[0072] The power of motors A and B is output through the first reduction mechanism 2 and transmitted to the first intermediate shaft 7 to achieve first-stage reduction.

[0073] The power of the first intermediate shaft 7 is transmitted to the first shift gear B through the first shifter 31. The first shift gear B meshes with the transmission gear 81B and transmits the power to the second intermediate shaft 8.

[0074] The second intermediate shaft 8 transmits power to the second reduction mechanism 4;

[0075] The power of the second reduction mechanism 4 is transmitted to the planet carrier of the first planetary gear train 6 through the second shift gear 52 and the second shifter 51. The planet carrier is fixedly connected to the sun gear and serves as the power input.

[0076] The planetary carrier transmits power to the main shaft 9 via the differential.

[0077] Third gear:

[0078] The first shifter 31 engages with the first shift gear A, and the second shifter 51 engages with the third shift gear 53;

[0079] The power of motors A and B is output through the first reduction mechanism 2 and transmitted to the first intermediate shaft 7 to achieve first-stage reduction.

[0080] The power of the first intermediate shaft 7 is transmitted to the first shift gear A through the first shifter 31. The first shift gear A meshes with the transmission gear A and transmits the power to the second intermediate shaft 8.

[0081] The second intermediate shaft 8 transmits power to the second reduction mechanism 4;

[0082] The power of the second reduction mechanism 4 is transmitted to the third shift gear 53, the planet carrier is grounded, and the sun gear of the first planetary gear train 6 serves as the power input;

[0083] The planetary carrier serves as the output, transmitting power to the main shaft 9 via the differential.

[0084] Fourth gear:

[0085] The first shifter 31 engages with the first shift gear B, and the second shifter 51 engages with the third shift gear 53.

[0086] The power of motors A and B is output through the first reduction mechanism 2 and transmitted to the first intermediate shaft 7 to achieve first-stage reduction.

[0087] The power of the first intermediate shaft 7 is transmitted to the first shift gear B through the first shifter 31. The first shift gear B meshes with the transmission gear 81B and transmits the power to the second intermediate shaft 8.

[0088] The second intermediate shaft 8 transmits power to the second reduction mechanism 4;

[0089] The power of the second reduction mechanism 4 is transmitted to the third shift gear 53, the planet carrier is grounded, and the sun gear of the first planetary gear train 6 serves as the power input;

[0090] The planetary carrier serves as the output, transmitting power to the main shaft 9 via the differential.

[0091] In first and second gear, the ring gear of the first planetary gear train 6 is fixedly connected to the sun gear as the power input, achieving a speed ratio of 1, and the planet carrier is connected to the differential as the output end; or, the ring gear of the first planetary gear train 6 is fixedly connected to the planet carrier, achieving a speed ratio of 1.

[0092] This solution achieves three-stage reduction in one gear, resulting in high transmission efficiency.

[0093] Secondly, this application also discloses a motor vehicle including two electric drive axles.

[0094] Heavy commercial vehicles (such as trucks or buses) and some high-performance passenger cars are equipped with two electric drive axles to meet their high power demands.

[0095] Alternatively, the electric drive axle for the motor vehicle is the electric drive axle disclosed in any of the above-mentioned schemes.

[0096] Since the electric drive axle has the aforementioned technical effects, motor vehicles equipped with this electric drive axle also have the same technical effects, which will not be elaborated further here.

[0097] The vehicle may have only two drive axles, both of which are electric drive axles as disclosed in the above-mentioned technical solution; the vehicle may also have multiple drive axles, two of which are electric drive axles, and these two electric drive axles are the electric drive axles disclosed in the above-mentioned technical solution. While ensuring strong power, power can be flexibly distributed to optimize energy consumption and handling.

[0098] In some embodiments, both electric drive bridges include two motors;

[0099] In other embodiments, both electric drive bridges include a motor;

[0100] In other embodiments, one electric drive bridge includes one motor, and the other electric drive bridge includes two motors.

[0101] The following explanation uses a combination of an electric drive bridge with two motors (hereinafter referred to as a dual-motor bridge) and an electric drive bridge with one motor (hereinafter referred to as a single-motor bridge) as examples.

[0102] When the vehicle starts, both the dual-motor axle and the single-motor axle are simultaneously engaged in first gear.

[0103] When the vehicle speed reaches the second gear speed, select the most economical driving gear while meeting the power requirements.

[0104] When a vehicle needs to overtake at high speed, select the driving gear according to the accelerator pedal opening, i.e., the overtaking torque requirement;

[0105] When the vehicle is cruising, there are two scenarios: unloaded cruising and fully loaded cruising. When cruising unloaded, the single motor axle is engaged in 3rd or 4th gear, while the dual motor axles remain in neutral. When cruising fully loaded, the driver selects the driving mode. When selecting single-axle mode (one electric drive axle provides power), both electric drive axles are engaged in 3rd or 4th gear, while the single motor axle remains in neutral. When selecting dual-axle mode (both electric drive axles provide power), both electric drive axles are engaged in 3rd or 4th gear, and the single motor axle is also engaged in 3rd or 4th gear.

[0106] Optionally, at least one electric drive axle has a wheel-side reducer on its main shaft 9 to further reduce the speed and meet the high torque requirements of heavy trucks.

[0107] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An electric drive bridge, characterized in that, It includes a power mechanism (1), a first reduction mechanism (2), a first shifting mechanism (3), a second reduction mechanism (4), a second shifting mechanism (5), a first planetary gear train (6), a first intermediate shaft (7), a second intermediate shaft (8), and a main shaft (9); The power mechanism (1) is connected to the input end of the first deceleration mechanism (2), and the output end of the first deceleration mechanism (2) is connected to one of the first intermediate shaft (7) and the second intermediate shaft (8); The first shifting mechanism (3) includes a first shifter (31) and a first shift gear (32) mounted on the first intermediate shaft (7), and the first shift gear (32) engages with the first intermediate shaft (7) through the first shifter (31); The second intermediate shaft (8) includes a transmission gear (81) that corresponds one-to-one with the first shift gear (32). The input end of the second reduction mechanism (4) is connected to the other of the first intermediate shaft (7) and the second intermediate shaft (8). The output end of the second reduction mechanism (4) is rotatably mounted on the main shaft (9). The second shifting mechanism (5) includes a second shifter (51), a second shift gear (52) and a third shift gear (53). The second shift gear (52) is connected to the output end of the second reduction mechanism (4), the third shift gear (53) is connected to the sun gear of the first planetary gear train (6), and the second shifter (51) is connected to the planet carrier of the first planetary gear train (6).

2. The electric drive bridge according to claim 1, characterized in that, The power mechanism (1) includes a motor; or, the power mechanism (1) includes at least two motors, each of which has an input end of the first deceleration mechanism (2) at its output end, and the at least two input ends share the output end of the first deceleration mechanism (2).

3. The electric drive bridge according to claim 1, characterized in that, The first reduction mechanism (2) is at least one of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism; The second reduction mechanism (4) is at least one of a cylindrical gear reduction mechanism and a planetary gear reduction mechanism.

4. The electric drive bridge according to any one of claims 1-3, characterized in that, The first planetary gear train (6) is an NGW planetary gear set.

5. The electric drive bridge according to any one of claims 1-3, characterized in that, The main shaft (9) also includes a differential (10), and the planetary carrier is connected to the main shaft (9) through the differential (10).

6. The electric drive bridge according to any one of claims 1-3, characterized in that, The electric drive bridge is a parallel axis electric drive bridge.

7. A motor vehicle, characterized in that, It includes two electric drive bridges, both of which are electric drive bridges according to any one of claims 1-6.

8. The motor vehicle according to claim 7, characterized in that, One of the two electric drive bridges includes a motor, and the other of the two electric drive bridges includes two motors; Alternatively, both of the aforementioned electric drive bridges may include two motors; Alternatively, both of the aforementioned electric drive bridges may include a motor.

9. The motor vehicle according to claim 7, characterized in that, At least one spindle (9) connected to the electric drive bridge is provided with a wheel-side speed reduction mechanism.

10. The motor vehicle according to any one of claims 7-9, characterized in that, The electric drive axle is located on the first side of the main shaft (9), which is opposite to the direction of vehicle movement.

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