Eight-motor two-gear parallel shaft planetary wheel composite transmission integrated electric drive bridge

Abstract

The application provides an eight-motor two-gear parallel shaft planetary wheel composite transmission integrated electric drive bridge. The eight-motor two-gear parallel shaft planetary wheel composite transmission integrated electric drive bridge comprises a main input unit, an auxiliary input unit, an intermediate assembly, a first planetary gear set, a second planetary gear set, an output unit and an auxiliary motor, one end of the intermediate assembly is connected with the main input unit and a sun gear of the second planetary gear set, the other end of the intermediate assembly is connected with the auxiliary input unit and a sun gear of the first planetary gear set, the intermediate assembly is provided with a gear shifting mechanism, the gear shifting mechanism is connected with the main input unit and the sun gear of the second planetary gear set or connected with the main input unit and the sun gear of the first planetary gear set, and a ring gear of the first planetary gear set is fixed. The eight-motor two-gear parallel shaft planetary wheel composite transmission integrated electric drive bridge provided by the application solves the problem that the existing electric drive bridge scheme cannot meet the use requirement.

Description

Technical Field

[0001] This invention relates to the field of electric drive axles, and more specifically to an integrated electric drive axle of an eight-motor, two-speed parallel shaft planetary gear composite transmission gearbox. Background Technology

[0002] Compared to passenger vehicle electric drive systems, commercial vehicle electric drive systems face multiple parallel technological approaches. This is due to the diverse types and uses of commercial vehicles, resulting in the industry's characteristics of small-batch production, multiple varieties, and customization. Currently, the new energy heavy-duty truck market is rapidly expanding, with designs using central electric drive assemblies as the power system becoming increasingly common. As the core component of the power system, the performance of the central electric drive assembly directly impacts the vehicle's overall efficiency and operating costs. Since some new energy heavy-duty trucks are designed for specific operating conditions—for example, a certain model requires high transmission efficiency, powerful performance, and ease of maintenance and repair—the currently mainstream integrated electric drive axle solution, while offering advantages in transmission efficiency and smoothness, cannot meet these requirements. Summary of the Invention

[0003] To address the issue that existing electric drive axle solutions cannot meet usage requirements, this invention provides an integrated electric drive axle with an eight-motor, two-speed parallel shaft planetary gear composite transmission that solves the aforementioned problems.

[0004] An integrated electric drive axle for an eight-motor, two-speed parallel-shaft planetary gear composite transmission includes a main input unit, an auxiliary input unit, an intermediate component, a first planetary gear set, a second planetary gear set, an output unit, and an auxiliary motor. One end of the intermediate component is connected to the sun gear of the main input unit and the second planetary gear set, and the other end is connected to the sun gear of the auxiliary input unit and the first planetary gear set. The intermediate component is equipped with a shifting mechanism, which is connected to the sun gear of the main input unit and the second planetary gear set, or to the sun gear of the main input unit and the first planetary gear set. The ring gear of the first planetary gear set is fixed, and the planet carrier of the first planetary gear set is connected to the ring gear of the second planetary gear set. The planet carrier of the second planetary gear set is connected to the output unit, and the output unit is equipped with the auxiliary motor.

[0005] In a preferred embodiment of the integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox provided by the present invention, it includes two main input units, two auxiliary input units, and two intermediate components. One end of each of the two intermediate components is connected to the two main input units and the sun gear of the same second planetary gear set, and the other end is connected to the two auxiliary input units and the sun gear of the same first planetary gear set.

[0006] In a preferred embodiment of the integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission provided by the present invention, the main input unit includes a main input shaft, a main input gear, a first gear gear, and a second gear gear fixedly disposed on the main input shaft. The main input gear is connected to the intermediate component, and the first gear gear or the second gear gear is connected to the shifting mechanism. The main input unit includes two main motors and a main connecting gear fixedly disposed on the main input shaft. The shaft ends of the two main motors are provided with main motor teeth, and the two main motor teeth mesh with the same main connecting gear.

[0007] In a preferred embodiment of the integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission provided by the present invention, the auxiliary input unit includes an auxiliary input shaft and an auxiliary input gear fixedly disposed on the auxiliary input shaft, the auxiliary input gear being connected to the intermediate component. The auxiliary input unit includes two auxiliary motors and an auxiliary connecting gear fixedly disposed on the auxiliary input shaft. The shaft ends of both auxiliary motors are provided with auxiliary motor teeth, and the two auxiliary motor teeth mesh with the same auxiliary connecting gear.

[0008] In a preferred embodiment of the integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox provided by the present invention, the intermediate component includes an intermediate shaft, a main intermediate gear, the shifting mechanism, and an auxiliary intermediate gear rotatably disposed on the intermediate shaft. The main intermediate gear meshes with the main input gear and simultaneously meshes with the sun gear of the second planetary gear set. The auxiliary intermediate gear meshes with the auxiliary input gear and simultaneously meshes with the sun gear of the first planetary gear set. The shifting mechanism meshes with the first gear gear and simultaneously meshes with the sun gear of the first planetary gear set, or meshes with the second gear gear and simultaneously meshes with the sun gear of the second planetary gear set.

[0009] The shifting mechanism includes a double gear, the smaller end of which meshes with the first gear gear and simultaneously with the sun gear of the first planetary gear set, or the larger end of which meshes with the second gear gear and simultaneously with the sun gear of the second planetary gear set.

[0010] In a preferred embodiment of the integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox provided by the present invention, the main input unit and the auxiliary input unit are arranged facing each other. The main input unit is provided with the main connecting tooth, the main input tooth, the first gear tooth, and the second gear tooth in sequence. The auxiliary input unit is provided with the auxiliary connecting tooth and the auxiliary input tooth in sequence. The sun gear of the second planetary gear set extends out a gear shaft and meshes with the main intermediate tooth and the main input tooth in sequence. The planet carrier of the second planetary gear set extends out a gear shaft and is located outside the sun gear shaft of the second planetary gear set, and disconnects from or meshes with the shift mechanism and the second gear tooth in sequence. The sun gear of the first planetary gear set extends out a gear shaft and is located outside the planet carrier shaft of the second planetary gear set, and disconnects from or meshes with the shift mechanism and the first gear tooth in sequence, while simultaneously meshing with the auxiliary intermediate tooth and the auxiliary input tooth in sequence.

[0011] In a preferred embodiment of the integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox provided by the present invention, the output unit includes a differential and a half-shaft connected in the differential, and the planet carrier of the second planetary gear set is connected to the differential housing.

[0012] Compared with existing technologies, the integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox provided by this invention has the following advantages: 1. The solution provided by this invention uses two power routes, each including two input units (main and auxiliary), effectively coupling power from eight motors, reducing energy loss, improving transmission efficiency, and achieving high-efficiency energy conversion. Furthermore, the configuration of multiple input motors combined with an output auxiliary motor provides powerful power output, improves system flexibility and efficiency, and adapts to the power requirements of heavy-duty mining trucks.

[0013] 2. The solution provided by this invention adopts a dual intermediate shaft synchronous two-speed transmission design, which can select the most suitable gear according to different working conditions and optimize power output. The two-speed transmission combined with the auxiliary motor configuration at the output end has flexible operation and can further optimize the power structure, so that the mine car can maintain the best performance under different loads and speeds.

[0014] 3. The solution provided by this invention adopts a two-stage planetary gear set structure. After reduction by the first-stage planetary gear set, the output is simultaneously driven by the sun gear and ring gear of the second-stage planetary gear set to drive the planet carrier. This results in a more compact structure, improved transmission efficiency, and reduced energy waste. It also reduces the overall weight, contributing to improved fuel economy and operational performance of the mining truck.

[0015] 4. The solution provided by this invention adopts a design combining a parallel shaft and a planetary gear set, which has high reliability and maintainability, simplifies daily maintenance and repair work, and reduces operating costs. The electric drive bridge can operate stably in various harsh mining environments and has strong environmental adaptability.

[0016] 5. The solution provided by this invention is easy to implement in modular production, and can be quickly adjusted and customized according to different vehicle models and performance requirements, which greatly shortens the product development cycle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an integrated electric drive axle for an eight-motor, two-speed parallel shaft planetary gear composite transmission gearbox.

[0018] The following are the numbered components in the diagram: Main motor 11, Main motor gear 12, Main input shaft 13, Main connecting gear 14, Main input gear 15, First gear gear 16, Second gear gear 17, Auxiliary motor 21, Auxiliary motor gear 22, Auxiliary input shaft 23, Auxiliary connecting gear 24, Auxiliary input gear 25, Intermediate shaft 31, Main intermediate gear 32, Auxiliary intermediate gear 33, Shifting mechanism 34, First planetary gear set 4, Second planetary gear set 5, Differential 61, Half shaft 62, Auxiliary motor 7. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Please see Figure 1 This is a schematic diagram of the integrated electric drive axle of the eight-motor, two-speed parallel shaft planetary gear composite transmission gearbox provided by the present invention. It includes a main input unit, an auxiliary input unit, an intermediate assembly, a first planetary gear set 4, a second planetary gear set 5, an output unit, and an auxiliary motor 7.

[0021] The main input unit includes a main motor 11, a main motor gear 12, a main input shaft 13, a main connecting gear 14, a main input gear 15, a first gear gear 16, and a second gear gear 17.

[0022] Two main motors 11 are arranged side by side, and each has a main motor tooth 12 at the end of its shaft. The main input shaft 13 is parallel to the main motors 11 and is located between the two main motors 11. Starting from the direction closest to the main motor 11, the main input shaft 13 is sequentially provided with a main connecting tooth 14, a main input tooth 15, a second gear tooth 17, and a first gear tooth 16.

[0023] The main connecting tooth 14 meshes with two main motor teeth 12 simultaneously, and the main input tooth 15, the second gear tooth 17, and the first gear tooth 16 are all connected to the intermediate component.

[0024] The auxiliary input unit includes an auxiliary motor 21, an auxiliary motor gear 22, an auxiliary input shaft 23, an auxiliary connecting gear 24, and an auxiliary input gear 25.

[0025] Two auxiliary motors 21 are arranged side by side, and each has an auxiliary motor tooth 22 at its shaft end. An auxiliary input shaft 23 is parallel to the auxiliary motors 21 and is located between the two auxiliary motors 21. Starting from the direction closest to the auxiliary motor 21, the auxiliary input shaft 23 is sequentially provided with an auxiliary connecting tooth 24 and an auxiliary input tooth 25.

[0026] The auxiliary motor 21 is positioned opposite the main motor 11, and the auxiliary input shaft 23 is positioned opposite the main input shaft 13 and the two are coaxial. The first gear 16 is close to the auxiliary input gear 25. The auxiliary connecting gear 24 simultaneously meshes with the two auxiliary motor gears 22, and the auxiliary input gear 25 is connected to the intermediate component.

[0027] The intermediate components include an intermediate shaft 31, a main intermediate gear 32, an auxiliary intermediate gear 33, and a shifting mechanism 34.

[0028] The intermediate shaft 31 is parallel to the auxiliary input shaft 23 and the main input shaft 13. The two ends of the intermediate shaft 31 are respectively provided with a main intermediate tooth 32 and an auxiliary intermediate tooth 33. The main intermediate tooth 32 meshes with the main input tooth 15 and is connected to the sun gear of the second planetary gear set 5. The auxiliary intermediate tooth 33 meshes with the auxiliary input tooth 25 and is connected to the sun gear of the first planetary gear set 4.

[0029] A shifting mechanism 34 is rotatably mounted in the middle section of the intermediate shaft 31, and the shifting mechanism 34 moves laterally along the intermediate shaft 31 under the action of the shift fork mechanism. The shifting mechanism 34 includes a double gear. When the shifting mechanism 34 moves to a position close to the auxiliary intermediate gear 33, its small tooth end meshes with the first gear 16 and is simultaneously connected to the sun gear of the first planetary gear set 4; when it moves to a position close to the main intermediate gear 32, its large tooth end meshes with the second gear 17 and is simultaneously connected to the planet carrier of the second planetary gear set 5.

[0030] It includes two intermediate components, which are connected to the main input unit and the auxiliary input unit on the outside, respectively, and connected to the same first planetary row 4 and second planetary row 5 on the inside.

[0031] The second planetary array 5 is located between the two auxiliary input units.

[0032] The sun gear of the second planetary array 5 extends toward the main input unit and has a gear at the end, which meshes with the two main intermediate teeth 32.

[0033] The planet carrier of the second planetary gear set 5 also extends towards the main input unit, located outside the sun gear of the second planetary gear set 5, and has a gear at the end. When the shift mechanism 34 moves to a position close to the main intermediate tooth 32, it simultaneously meshes with the large tooth ends of the two shift mechanisms 34.

[0034] The first planetary arrangement 4 is located between the intermediate assembly and the second planetary arrangement 5.

[0035] The sun gear of the first planetary gear set 4 extends toward the main input unit and has two gears at its end. The gear closer to the main input unit meshes with the small teeth of the two gear shifting mechanisms 34 when the shifting mechanism 34 moves to a position close to the auxiliary intermediate teeth 33. The gear closer to the auxiliary input unit meshes with the two auxiliary intermediate teeth 33 at the same time.

[0036] The planet carrier of the first planetary set 4 extends towards the second planetary set 5, connecting to the gear ring of the second planetary set 5. The gear ring of the first planetary set 4 is fixed.

[0037] The output unit includes a differential 61 and half-shafts 62. The differential 61 is located outside the second planetary gear set 5, and the planet carrier of the second planetary gear set 5 extends towards the differential 61 and connects to the housing of the differential 61. Two half-shafts 62 are inserted into the differential 61.

[0038] Setting an auxiliary motor at the output end is a common technique in this field, and therefore does not affect the understanding and implementation of this solution by those skilled in the art.

[0039] The two shifting mechanisms 34 move synchronously. When both shifting mechanisms 34 are moved to a position close to the auxiliary intermediate gear 33, they are in first gear of the electric drive axle. When both shifting mechanisms 34 are moved to a position close to the main intermediate gear 32, they are in second gear of the electric drive axle.

[0040] In the first gear position of the electric drive bridge, the power generated by the main input unit is output through two paths: The first path starts from the main input shaft 13, passes through the main input gear 15 and the main intermediate gear 32, and drives the sun gear of the second planetary gear set 5; the second path starts from the main input shaft 15, passes through the first gear gear 16 and the shift mechanism 34, and drives the sun gear of the first planetary gear set 4. The power generated by the auxiliary input unit starts from the auxiliary input shaft 23, passes through the auxiliary input gear 25 and the auxiliary intermediate gear 33, and drives the sun gear of the first planetary gear set 4; Both the main input unit and the auxiliary input unit drive the sun gear of the first planetary gear set 4. Since the ring gear of the first planetary gear set 4 is fixed, this power is transmitted through the planet carrier of the first planetary gear set 4 to drive the ring gear of the second planetary gear set 5. At the same time, the main input unit also drives the sun gear of the second planetary gear set 5. Therefore, power is input from both the sun gear and the ring gear of the second planetary gear set 5, drives the differential 61 from the planet carrier of the second planetary gear set 5, and is finally output from the half-shaft 62.

[0041] In the second gear position of the electric drive bridge, the power generated by the main input unit is output through two paths: The first path starts from the main input shaft 13, passes through the main input gear 15 and the main intermediate gear 32, and drives the sun gear of the second planetary gear set 5; the second path starts from the main input shaft 15, passes through the second gear 17 and the shift mechanism 34, and directly drives the planet carrier of the second planetary gear set 5. The power generated by the auxiliary input unit starts from the auxiliary input shaft 23, passes through the auxiliary input gear 25 and the auxiliary intermediate gear 33, and drives the sun gear of the first planetary gear set 4; Only the auxiliary input unit drives the sun gear of the first planetary gear set 4. Since the ring gear of the first planetary gear set 4 is fixed, this power is transmitted through the planet carrier of the first planetary gear set 4 to drive the ring gear of the second planetary gear set 5. At the same time, the main input unit drives both the sun gear and the planet carrier of the second planetary gear set 5. Therefore, power is simultaneously input from both the sun gear and the ring gear of the second planetary gear set 5, drives the differential 61 from the planet carrier of the second planetary gear set 5, and is finally output from the half-shaft 62.

[0042] The half-shaft 62 is equipped with an auxiliary motor 7 for auxiliary braking or auxiliary driving. For ease of illustration, the attached diagram shows only the left half-shaft 62 connected. The use of an auxiliary motor at the output end is a common technique in this field and therefore does not impede the understanding and implementation of this solution by those skilled in the art.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An integrated electric drive axle for an eight-motor, two-speed parallel shaft planetary gear composite transmission gearbox, characterized in that: The system includes a main input unit, an auxiliary input unit, an intermediate component, a first planetary gear set, a second planetary gear set, an output unit, and an auxiliary motor. One end of the intermediate component is connected to the sun gear of the main input unit and the second planetary gear set, and the other end is connected to the sun gear of the auxiliary input unit and the first planetary gear set. The intermediate component is equipped with a shifting mechanism, which is connected to the sun gear of the main input unit and the second planetary gear set, or to the sun gear of the main input unit and the first planetary gear set. The ring gear of the first planetary gear set is fixed, and the planet carrier of the first planetary gear set is connected to the ring gear of the second planetary gear set. The planet carrier of the second planetary gear set is connected to the output unit, and the output unit is equipped with the auxiliary motor.

2. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 1, characterized in that: It includes two main input units, two auxiliary input units, and two intermediate components. One end of each of the two intermediate components is connected to the two main input units and the sun gear of the same second planetary gear set, and the other end is connected to the two auxiliary input units and the sun gear of the same first planetary gear set.

3. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 1 or 2, characterized in that: The main input unit includes a main input shaft, a main input tooth, a first gear tooth, and a second gear tooth fixedly mounted on the main input shaft. The main input tooth is connected to the intermediate component, and the first gear tooth or the second gear tooth is connected to the shifting mechanism.

4. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 3, characterized in that: The main input unit includes two main motors and a main connecting tooth fixedly mounted on the main input shaft. The shaft ends of the two main motors are provided with main motor teeth, and the two main motor teeth mesh with the same main connecting tooth.

5. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 4, characterized in that: The auxiliary input unit includes an auxiliary input shaft and auxiliary input teeth fixedly disposed on the auxiliary input shaft, the auxiliary input teeth being connected to the intermediate component.

6. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 5, characterized in that: The auxiliary input unit includes two auxiliary motors and an auxiliary connecting tooth fixedly disposed on the auxiliary input shaft. The shaft ends of the two auxiliary motors are provided with auxiliary motor teeth, and the two auxiliary motor teeth mesh with the same auxiliary connecting tooth.

7. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 6, characterized in that: The intermediate component includes an intermediate shaft, a main intermediate gear rotatably disposed on the intermediate shaft, the shifting mechanism, and an auxiliary intermediate gear. The main intermediate gear meshes with the main input gear and simultaneously with the sun gear of the second planetary gear set. The auxiliary intermediate gear meshes with the auxiliary input gear and simultaneously with the sun gear of the first planetary gear set. The shifting mechanism meshes with the first gear gear and simultaneously with the sun gear of the first planetary gear set, or meshes with the second gear gear and simultaneously with the sun gear of the second planetary gear set.

8. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 7, characterized in that: The shifting mechanism includes a double gear, the smaller end of which meshes with the first gear gear and simultaneously with the sun gear of the first planetary gear set, or the larger end of which meshes with the second gear gear and simultaneously with the sun gear of the second planetary gear set.

9. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 7 or 8, characterized in that: The main input unit and the auxiliary input unit are arranged facing each other. The main input unit is provided with the main connecting tooth, the main input tooth, the first gear tooth, and the second gear tooth in sequence. The auxiliary input unit is provided with the auxiliary connecting tooth and the auxiliary input tooth in sequence. The sun gear of the second planetary set extends out a gear shaft and meshes with the main intermediate tooth and the main input tooth in sequence. The planet carrier of the second planetary set extends out a gear shaft and is located outside the sun gear shaft of the second planetary set. It disconnects from or meshes with the shifting mechanism and the second gear tooth in sequence. The sun gear of the first planetary set extends out a gear shaft and is located outside the planet carrier shaft of the second planetary set. It disconnects from or meshes with the shifting mechanism and the first gear tooth in sequence, and simultaneously meshes with the auxiliary intermediate tooth and the auxiliary input tooth in sequence.

10. The integrated electric drive axle of the eight-motor two-speed parallel shaft planetary gear composite transmission gearbox according to claim 1, characterized in that: The output unit includes a differential and a half-shaft connected within the differential, and the planet carrier of the second planetary gear set is connected to the differential housing.

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