Integrated electric drive axle system, powertrain, and vehicle

Abstract

The application provides an integrated electric drive axle system, a power system and a vehicle, and relates to the field of drive axle control driving. The integrated electric drive axle system comprises a flat wire motor, a speed reducer, an expanded axle housing assembly and a wheel edge assembly; the flat wire motor and the speed reducer are installed in the middle part of the expanded axle housing assembly, and the flat wire motor is connected with the speed reducer; the wheel edge assembly is connected with the end part of the expanded axle housing assembly; the stator of the flat wire motor has double short-pitch windings; the speed reducer comprises a speed reducer shell, an oil baffle and a gear set, and the gear set is located in the speed reducer shell; the speed reducer shell comprises a main shell and a protruding shell, the main shell is connected with the protruding shell and the expanded axle housing assembly respectively, and the protruding shell is inserted into the expanded axle housing assembly; the oil baffle is detachably installed at the opening end of the protruding shell and is opposite to the gear set. The integrated electric drive axle system provided by the application solves the technical problems of insufficient vehicle endurance mileage and high energy loss in the prior art.

Description

Technical Field

[0001] This application relates to the field of drive axle control for driving, and more specifically, to an integrated electric drive axle system, a power system, and a vehicle. Background Technology

[0002] The electric drive axle assembly is one of the core components of an electric vehicle, connected to the vehicle body via the suspension. It consists of an axle housing assembly, a reducer, a motor, half-shafts, and brakes, and functions as a load-bearing, torque-transmitting, and braking axle.

[0003] Currently, most axle housing assemblies are made using a stamping and welding method, most reducers are made using a parallel shaft method, and most motors are made using permanent magnet synchronous motors or AC asynchronous motors. Even after combining these components, there are still pain points such as insufficient vehicle range and high energy loss. Utility Model Content

[0004] The purpose of this application is to provide an integrated electric drive axle system, power system, and vehicle to alleviate the technical problems of insufficient vehicle range and high energy loss in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: In the first aspect, the integrated electric drive axle system provided by this utility model includes a flat wire motor, a reducer, an expanded axle housing assembly, and two wheel rim assemblies; The flat wire motor and the reducer are both installed in the middle of the expansion axle housing assembly, and the flat wire motor is connected to the reducer in a driving connection. The two wheel assemblies are respectively connected to both ends of the expansion axle housing assembly. The flat wire motor includes a motor housing, a stator, and a rotor. The stator is installed inside the motor housing, and the rotor is rotatably connected to the housing and located inside the stator. The stator has two short-pitch windings. The reducer includes a reducer housing, an oil baffle, and a gear set, the gear set being located inside the reducer housing; the reducer housing includes a main housing and an extension housing, the main housing being connected to the extension housing and the expansion axle housing assembly respectively, the extension housing being inserted into the expansion axle housing assembly; the oil baffle is detachably installed at the open end of the extension housing and is opposite to the gear set.

[0006] Based on the above solutions, the oil baffle can reduce the loss of gear oil, the expanded axle housing assembly can reduce the overall weight and achieve overall integration, and the flat wire motor can reduce resistance and reduce copper loss.

[0007] Furthermore, the oil baffle is an arc shape that is concave away from the gear set.

[0008] Based on the above design, the oil baffle is arc-shaped to avoid the gear set.

[0009] Furthermore, the inner wall of the expanded bridge housing assembly is provided with a clearance groove, and the oil baffle is located in the clearance groove; The clearance groove is arc-shaped to fit the oil baffle.

[0010] Based on the above scheme, the clearance groove is used to avoid the oil baffle.

[0011] Furthermore, the expansion axle housing assembly is equipped with a pad, which is located between the wheel-side assembly and the reducer for connection to the vehicle frame; The pad is provided with a first weight-reducing groove.

[0012] Based on the above scheme, the first weight-reducing groove reduces the weight of the expansion bridge housing assembly.

[0013] Furthermore, the end of the bulging bridge housing assembly has a shaft tube; The wheel assembly includes a wheel hub and a stepped bearing, the stepped bearing being mounted on the axle tube, and the wheel hub being mounted on the stepped bearing.

[0014] Based on the above scheme, the shaft tube of the expansion axle housing assembly is connected to the wheel hub via a stepped bearing.

[0015] Furthermore, the stepped bearing includes a first bearing and a second bearing, the first bearing being connected to the second bearing, and the inner ring diameter of the first bearing being smaller than the inner ring diameter of the second bearing.

[0016] Based on the above solution, the diameter of the part of the shaft tube corresponding to the first bearing is reduced, thereby reducing the weight.

[0017] Furthermore, the sidewall of the wheel hub is provided with a second weight-reducing groove.

[0018] Based on the above solution, the weight of the wheel hub can be reduced.

[0019] Furthermore, the hub is provided with a positioning hole for the set screw to pass through.

[0020] Based on the above solution, the wheel hub and the brake drum of the brake are separated by the positioning hole, and there is no need to set the set screw boss, thus reducing the weight.

[0021] Furthermore, the wheel assembly also includes an anti-lock braking system (ABS) mounting bracket, which is fixed to the axle tube of the expansion axle housing assembly.

[0022] Based on the above solution, the anti-lock braking system fixing bracket is directly welded to the axle tube, reducing the overall weight of the wheel-side assembly.

[0023] Furthermore, the integrated electric drive axle system also includes two brakes, both of which are mounted on the expanded axle housing assembly and respectively cooperate with the two wheel assemblies.

[0024] Based on the above scheme, the wheel-side assembly is braked using a brake.

[0025] Secondly, the power system provided by this utility model includes a power battery and an integrated electric drive axle system as described in any of the above claims; The power battery is connected to the flat wire motor in the integrated electric drive axle system.

[0026] Based on the above scheme, the power battery is connected to the flat wire motor to achieve the coordination of the power system.

[0027] Thirdly, the vehicle provided by this utility model includes a frame and a power system as described above; The power system is mounted on the vehicle frame.

[0028] Based on the above scheme, the chassis provides fixed support for the power system.

[0029] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows: The integrated electric drive axle system provided by this utility model adopts an expanded axle housing assembly. The flat wire motor and reducer are both installed in the middle of the expanded axle housing assembly, and the flat wire motor is connected to the reducer via a transmission connection. Two wheel-side assemblies are connected to both ends of the expanded axle housing assembly. The expanded axle housing assembly has significant advantages over traditional cast or welded axle housings, and is particularly suitable for the lightweight, integrated, and high-efficiency requirements of electric light trucks. The expanded axle housing assembly is seamless, has strong integrity, increases torsional stiffness by 15%-25%, extends fatigue life, and achieves over 1 million durability tests. Due to the highly integrated design of the expanded axle housing, the chassis layout is more compact, freeing up battery placement space (increasing cargo box volume by 5%-8%). The expanded axle housing assembly uses high-pressure liquid to expand the steel pipe into the target shape, resulting in more uniform material distribution and precise control of wall thickness (typically 3-5mm), reducing weight by 20%-30% compared to traditional cast axle housings. Furthermore, the expansion axle housing assembly can integrate the mounting positions of the flat wire motor and reducer, reducing connecting parts and shortening the power transmission path.

[0030] The integrated electric drive bridge system uses a flat wire motor, which includes a motor housing, a stator, and a rotor. The stator is installed inside the motor housing, and the rotor is rotatably connected to the housing and located inside the stator. The stator has dual short-pitch windings. The flat wire motor increases the stator slot fill factor by 20%, reduces the winding end height, reduces resistance by 10%-20%, and reduces copper losses. The dual short-pitch windings further reduce the winding end height by 10%-20%, reduce resistance by 2%-3%, and reduce copper losses.

[0031] The reducer in the integrated electric drive axle system includes a reducer housing, an oil baffle, and a gear set, with the gear set located inside the reducer housing. The reducer housing includes a main housing and an extension housing. The main housing is connected to the extension housing and the expansion axle housing assembly, respectively, and the extension housing is inserted into the expansion axle housing assembly. The oil baffle is detachably installed at the open end of the extension housing and is opposite to the gear set. The oil baffle reduces the oil churning loss of the gear set by approximately 30-50%. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the integrated electric drive bridge system provided in the embodiments of this application; Figure 2 This is a schematic diagram of the reducer in the integrated electric drive bridge system provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the oil baffle in the integrated electric drive bridge system provided in the embodiments of this application; Figure 4 This is a schematic diagram of the hub structure in the integrated electric drive axle system provided in the embodiments of this application; Figure 5 This is a schematic diagram of the internal structure of the wheel hub in the integrated electric drive axle system provided in the embodiments of this application.

[0034] icon: 1-Reducer; 11-Reducer housing; 12-Oil baffle; 121-Connecting protrusion; 13-Gear set; 21-Hub; 22-Stepped bearing; 221-First bearing; 222-Second bearing; 211-Locating hole; 3-Expansion axle housing assembly; 31-Gasket; 4-Wheel-side assembly; 5-Flat wire motor; 6-Brake. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] Example 1 With the development of commercial light trucks for carrying more cargo and running faster, reducing vehicle curb weight and increasing vehicle freight space have also posed challenges to the performance of axles.

[0039] To address the pain points and challenges in the light truck industry, such as insufficient driving range, the conflict between load capacity and space, the efficiency bottleneck of the three-point system, and large unsprung mass, see [reference needed]. Figure 1 The integrated electric drive bridge system provided in this embodiment includes a flat wire motor 5, a reducer 1, an expansion bridge housing assembly 3, and two wheel assemblies 4. The flat wire motor 5 and the reducer 1 are both installed in the middle of the expansion bridge housing assembly 3, and the flat wire motor 5 is connected to the reducer 1 in a transmission manner. The two wheel assemblies 4 are respectively connected to both ends of the expansion bridge housing assembly 3. The flat wire motor 5 includes a motor housing, a stator, and a rotor. The stator is installed inside the motor housing, and the rotor is rotatably connected to the housing and located inside the stator. The stator has double short-pitch windings. The reducer 1 includes a reducer housing 11, an oil baffle 12, and a gear set 13. The gear set 13 is located inside the reducer housing 11. The reducer housing 11 includes a main housing and an extension housing. The main housing is connected to the extension housing and the expansion bridge housing assembly 3, respectively. The extension housing is inserted into the expansion bridge housing assembly 3. The oil baffle 12 is detachably installed at the opening end of the extension housing and is opposite to the gear set 13.

[0040] The integrated electric drive axle system utilizes an expanded axle housing assembly 3, which offers significant advantages over traditional cast or welded axle housings, making it particularly suitable for the lightweight, integrated, and high-efficiency requirements of electric light trucks. The expanded axle housing assembly is seamless, possesses strong integrity, increases torsional stiffness by 15%-25%, extends fatigue life, and achieves over 1 million durability tests. Due to its highly integrated design, the chassis layout is more compact, freeing up battery placement space (increasing cargo box volume by 5%-8%). The expanded axle housing assembly uses high-pressure liquid to expand the steel pipe into the target shape, resulting in more uniform material distribution and precise control of wall thickness (typically 3-5mm), reducing weight by 20%-30% compared to traditional cast axle housings. Furthermore, the expanded axle housing assembly 3 can integrate the mounting positions of the flat wire motor 5 and the reducer 1, reducing connecting parts and shortening the power transmission path.

[0041] The integrated electric drive bridge system uses a flat wire motor 5, and the stator of the flat wire motor 5 has double short-pitch windings; the flat wire motor 5 increases the stator slot fill factor by 20%, reduces the winding end height, reduces resistance by 10%-20%, and reduces copper loss; the double short-pitch windings further reduce the winding end height by 10%-20%, reduce resistance by 2%-3%, and reduce copper loss.

[0042] See Figure 2 The reducer 1 in the integrated electric drive axle system includes an oil baffle 12, which is detachably installed at the open end of the housing and opposite to the gear set 13. The oil baffle 12 reduces the oil churning loss of the gear set 13 by about 30-50%. In this embodiment, the oil baffle 12 is connected to the housing by screws.

[0043] In the optional solution provided by this utility model embodiment, the integrated electric drive axle system further includes two brakes 6, both of which are installed on the expansion axle housing assembly 3 and respectively cooperate with two wheel rim assemblies 4.

[0044] Specifically, both brakes 6 are bolted to the expansion axle housing assembly 3.

[0045] The brake 6 is used to cooperate with the wheel assembly 4 to brake the wheel assembly 4.

[0046] The structure of the flat wire motor 5 is described in detail below: In the optional embodiment of this utility model, the stator includes stacked silicon steel sheets in a cylindrical shape, and double short-pitch windings are embedded in the silicon steel sheets.

[0047] Specifically, the silicon steel sheet is set to an ultra-thin 0.25mm silicon steel sheet; the ultra-thin silicon steel sheet reduces the eddy current loss of the iron core and reduces iron loss.

[0048] In the optional embodiment of this utility model, the rotor is equipped with magnets.

[0049] Specifically, in this embodiment, the magnets are segmented and bonded, that is, a whole piece of magnet is divided into multiple smaller magnet blocks along its length, and then they are sequentially bonded and arranged side by side in the same magnet slot of the rotor; segmented bonding of the magnets reduces eddy current losses, reduces magnet temperature rise, and improves motor efficiency.

[0050] In the optional solution provided by this utility model embodiment, the end of the flat wire motor 5 is plastic-encapsulated to improve the heat dissipation capacity of the winding end and reduce the temperature rise of the stator winding by 10-15℃; at the same time, the motor topology is optimized to reduce the loss in the high speed and low torque region of the motor, with the highest efficiency reaching over 98%, and the efficiency at the constant speed point is improved by 3-6%, which is suitable for the application conditions of the whole vehicle, improves the efficiency of the motor system by 2-5%, and ensures the competitiveness of the product.

[0051] The structure of reducer 1 is described in detail below: In the optional solutions provided by the embodiments of this utility model, see Figure 2 The oil baffle 12 is an arc shape that is concave away from the gear set 13.

[0052] Specifically, the reducer housing 11 is made of aluminum alloy, and the input shaft of the reducer 1 uses a low rolling resistance bearing. The oil baffle 12 is fixed to the reducer housing 11 with screws. During assembly, the gear set 13 is first installed on the reducer housing 11, and then the oil baffle 12 is installed. When installing the oil baffle 12, care must be taken to ensure that it avoids interference with the movement of the gear set 13. Preferably, see [reference needed]. Figure 3 The outer wall of the oil baffle 12 is provided with a connecting protrusion 121, which is used to connect with the reducer housing 11. The oil baffle 12 is arc-shaped to match the shape of the gear set 13.

[0053] Oil churning losses are converted into heat, exacerbating the temperature rise of the electric drive axle. At high temperatures, the motor / electronic control system may limit power. Adding an oil baffle 12 can reduce the heat generated by oil churning, lowering the operating temperature of the reducer 1 by 5-10°C. This reduces the load on the cooling system, indirectly improving range. Precise lubrication can reduce lubricant usage (e.g., from 3.5L to 2.8L), reducing overall assembly weight. Reduced oil churning reduces gear whine noise (NVH optimization of 3-5dB). Lighter weight offsets some battery weight, increasing payload. Reduced noise meets the requirements of urban delivery vehicles.

[0054] The following is a detailed description of the structure of the expansion bridge housing assembly 3: In the optional solution provided by this utility model embodiment, the inner wall of the expansion bridge housing assembly 3 is provided with a relief groove, and the oil baffle 12 is located in the relief groove; the relief groove is an arc shape adapted to the oil baffle 12.

[0055] Specifically, in this embodiment, the gear oil used in reducer 1 is 75W-80 GL-4 low viscosity gear oil. The reducer 1 weighs 36.5 kg.

[0056] The clearance groove is used to avoid the oil baffle 12.

[0057] In the optional solution provided by this utility model embodiment, the expansion axle housing assembly 3 is equipped with a pad 31, which is located between the wheel-side assembly 4 and the reducer 1 and is used to connect with the vehicle frame; the pad 31 is provided with a first weight reduction groove.

[0058] Specifically, the cross-section of the expansion axle housing assembly 3 is set to 100×110×8mm, with a durability of 20 years or 2 million kilometers. Two pads 31 are provided, located on both sides of the reducer 1, and both are welded to the outer wall of the expansion axle housing assembly 3. The function of the pads 31 is to transfer the weight of the entire vehicle to the expansion axle housing assembly 3, serving as a connection and force transmission device.

[0059] The pad 31 is provided with a first weight reduction groove to further reduce the unsprung mass.

[0060] The structure of wheel assembly 4 is described in detail below: In the optional embodiment of this utility model, the end of the expansion axle housing assembly 3 has a shaft tube; the wheel rim assembly 4 includes a wheel hub 21 and a stepped bearing 22, the stepped bearing 22 is mounted on the shaft tube, and the wheel hub 21 is mounted on the stepped bearing 22.

[0061] Specifically, the wheel assembly 4 uses a maintenance-free stepped bearing 22, which has a lifespan of 2 million kilometers. Furthermore, the stepped bearing 22 employs a stepped shaft low rolling resistance bearing. By spraying a polytetrafluoroethylene coating onto the oil seal and optimizing the roller raceway roughness, the bearing resistance torque of the wheel hub 21 is reduced. The frictional torque of a single bearing can reach 3 Nm. Compared to existing bearing units, this reduces energy consumption by 0.297 kWh / 100 km, saving approximately 0.89 kWh (about 623 RMB) in battery costs based on a 300 km vehicle range.

[0062] In the optional solutions provided by the embodiments of this utility model, see Figure 5 The stepped bearing 22 includes a first bearing 221 and a second bearing 222. The first bearing 221 is connected to the second bearing 222, and the inner ring diameter of the first bearing 221 is smaller than the inner ring diameter of the second bearing 222.

[0063] Specifically, the inner ring sidewall of the first bearing 221 is connected to the inner ring sidewall of the second bearing 222, and a step is formed at the connection.

[0064] Because the inner ring diameter of the first bearing 221 is smaller than the inner ring diameter of the second bearing 222, the diameter of the shaft tube opposite to the first bearing 221 can be reduced, which is beneficial for weight reduction.

[0065] In the optional solution provided by this utility model embodiment, the side wall of the wheel hub 21 is provided with a second weight reduction groove, which is used to reduce the weight of the wheel hub 21.

[0066] In the optional solutions provided by the embodiments of this utility model, see Figure 4 The hub 21 is provided with a positioning hole 211 for the set screw to pass through.

[0067] Specifically, the wheel hub 21 is attached to the brake drum of the brake 6, making it inconvenient to disassemble when disassembly is required; the wheel hub 21 is provided with a positioning hole 211, which has an internal thread. When disassembling, a bolt can be installed into the positioning hole 211. By rotating the bolt, the bolt extends outward, thus separating the brake drum of the brake 6 from the wheel hub 21 by pushing against the wheel hub 21.

[0068] The positioning hole 211 is directly set on the wheel hub 21, eliminating the top screw hole boss in the prior art, which can reduce the weight of the wheel assembly 4.

[0069] In the optional embodiment of this utility model, the wheel assembly 4 further includes an anti-lock braking mechanism fixing bracket, which is fixed to the shaft tube of the expansion axle housing assembly 3.

[0070] Specifically, the anti-lock braking system (ABS) mounting bracket is used to secure the ABS.

[0071] By optimizing the anti-lock braking system (ABS) mounting bracket and directly welding it onto the axle tube, the overall weight of the wheel assembly 4 is reduced.

[0072] The advantages of integrated electric drive bridge systems are explained below: This integrated electric drive axle system adopts an expanded axle housing assembly 3, and optimizes the structure of the hub 21, bearings, axle tubes, anti-lock braking mechanism fixing brackets, etc. to achieve weight reduction. Furthermore, by using low-viscosity gear oil and optimizing the drag torque of the stepped bearing 22 and the reducer 1 bearing, the system increases oil level and reduces capacity loss, achieving the following effects: Reduce oil churning losses and improve assembly efficiency: By arranging the oil baffle 12, the depth of gear immersion in oil is reduced or the oil flow is guided, thus reducing unnecessary oil turbulence. Oil turbulence losses can be reduced by 30%-50%, improving the overall efficiency of the electric drive axle by 1% and increasing the driving range by approximately 2%-3% (for example, from 18kWh / 100km, it can be reduced to 17.5kWh / 100km), directly reducing battery energy consumption and alleviating range anxiety.

[0073] Improved lubrication efficiency and enhanced reliability: Frequent start-stop cycles or heavy-load conditions in electric light trucks can lead to uneven lubrication in the reducer 1, causing wear on gears and bearings. Adding an oil baffle 12 directs lubricating oil to critical friction pairs (such as bearings and gear meshing areas), preventing insufficient lubrication or excessive splashing. This reduces gear pitting and bearing failure, extending maintenance intervals by 20%-30%. It also reduces failure rates and replacement costs, compensating for the high initial purchase cost of electric light trucks.

[0074] Reduce temperature rise and alleviate thermal management pressure: Because oil churning losses are converted into heat, the temperature rise of the electric drive axle is aggravated, and the motor / electronic control may limit power at high temperatures. Adding an oil baffle 12 reduces the heat generated by oil churning, lowering the operating temperature of the reducer 1 by 5-10℃. This reduces the load on the cooling system, indirectly improving range.

[0075] Lightweight design and noise optimization: Precise lubrication reduces lubricant usage (e.g., from 3.5L to 2.8L), lowering overall assembly weight. Reduced oil churning lowers gear whine noise (NVH optimization of 3-5dB). Lighter weight offsets some battery weight, increasing payload. Lower noise levels meet the requirements of urban delivery vehicles.

[0076] Integrated design improves the efficiency of the electric drive bridge: The expanded axle housing assembly can integrate the motor / reducer into a single mounting position, reducing connecting parts and shortening the power transmission path. This improves transmission efficiency (reducing energy loss by 1%-2% compared to traditional split designs), allows for a more compact chassis layout, and frees up space for battery placement (increasing cargo volume by 5%-8%).

[0077] Example 2 The power system provided in this embodiment includes the integrated electric drive axle system described in Embodiment 1, and therefore also possesses all the beneficial effects of Embodiment 1.

[0078] In the optional solution provided by this utility model embodiment, the power system includes a power battery, which is connected to the flat wire motor 5 in the integrated electric drive bridge system.

[0079] Specifically, the power battery and the flat wire motor 5 are not simply connected by electricity, but through deep coupling of electrical, control and thermal management, the chemical energy of the power battery is efficiently, intelligently and reliably converted into mechanical energy to drive the vehicle forward, ultimately achieving the comprehensive optimal solution for electric vehicles in terms of range, performance, space and cost.

[0080] The connection between the power battery and the flat wire motor 5 in the integrated electric drive axle system is a multi-level, highly coordinated organic whole, from physical wires to energy control and system integration.

[0081] Example 3 The vehicle provided in this embodiment of the utility model includes the power system described in Embodiment 2, and therefore also possesses all the beneficial effects of Embodiment 2, which will not be repeated here.

[0082] In the optional embodiment of this utility model, the vehicle includes a frame, and the power system is mounted on the frame.

[0083] The frame provides fixed support for the power system.

[0084] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0085] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An integrated electric drive bridge system, characterized in that, include: Flat wire motor (5), reducer (1), expansion axle housing assembly (3) and two wheel rim assemblies (4); The flat wire motor (5) and the reducer (1) are both installed in the middle of the expansion axle housing assembly (3), and the flat wire motor (5) is connected to the reducer (1) in a transmission connection. The two wheel assemblies (4) are respectively connected to the two ends of the expansion axle housing assembly (3). The flat wire motor (5) includes a motor housing, a stator and a rotor. The stator is installed inside the motor housing, and the rotor is rotatably connected to the housing and located inside the stator. The stator has two short-pitch windings. The reducer (1) includes a reducer housing (11), an oil baffle (12), and a gear set (13). The gear set (13) is located inside the reducer housing (11). The reducer housing (11) includes a main housing and an extension housing. The main housing is connected to the extension housing and the expansion bridge housing assembly (3) respectively. The extension housing is inserted into the expansion bridge housing assembly (3). The oil baffle (12) is detachably installed at the opening end of the extension housing and is opposite to the gear set (13).

2. The integrated electric drive bridge system according to claim 1, characterized in that, The oil baffle (12) is an arc shape that is concave away from the gear set (13).

3. The integrated electric drive bridge system according to claim 2, characterized in that, The inner wall of the expansion bridge housing assembly (3) is provided with a clearance groove, and the oil baffle (12) is located in the clearance groove; The clearance groove is arc-shaped to fit the oil baffle (12).

4. The integrated electric drive bridge system according to claim 1, characterized in that, The expansion axle housing assembly (3) is equipped with a pad (31), which is located between the wheel assembly (4) and the reducer (1) and is used to connect to the vehicle frame; The pad (31) is provided with a first weight-reducing groove.

5. The integrated electric drive bridge system according to claim 1, characterized in that, The end of the bulging bridge housing assembly (3) has a shaft tube; The wheel assembly (4) includes a wheel hub (21) and a stepped bearing (22), the stepped bearing (22) being mounted on the axle tube, and the wheel hub (21) being mounted on the stepped bearing (22).

6. The integrated electric drive bridge system according to claim 5, characterized in that, The stepped bearing (22) includes a first bearing (221) and a second bearing (222), the first bearing (221) is connected to the second bearing (222), and the inner ring diameter of the first bearing (221) is smaller than the inner ring diameter of the second bearing (222).

7. The integrated electric drive bridge system according to claim 5, characterized in that, The side wall of the hub (21) is provided with a second weight reduction groove.

8. The integrated electric drive bridge system according to claim 5, characterized in that, The hub (21) is provided with a positioning hole (211) for the set screw to pass through.

9. The integrated electric drive bridge system according to claim 1, characterized in that, The wheel assembly (4) also includes an anti-lock braking system fixing bracket, which is fixed to the shaft tube of the expansion axle housing assembly (3).

10. The integrated electric drive bridge system according to claim 1, characterized in that, The integrated electric drive axle system also includes two brakes (6), both of which are mounted on the expansion axle housing assembly (3) and respectively cooperate with the two wheel assemblies (4).

11. A power system, characterized in that, Includes a power battery and an integrated electric drive axle system as described in any one of claims 1-10; The power battery is connected to the flat wire motor (5) in the integrated electric drive bridge system.

12. A vehicle, characterized in that, Includes the chassis and the powertrain as described in claim 11; The power system is mounted on the vehicle frame.

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