Axial motor double-input four-gear electric drive system

Abstract

The axial motor double-input four-gear electric drive system, two axial motors are coaxially arranged in a series connection mode, each group of four-gear speed change assemblies is independently driven by an axial motor, independent driving and gear shifting of two groups of four-gear speed change assemblies are formed, and the driving requirements of multi-gear power and non-power interruption gear shifting are met; the two axial motors are coaxially arranged in a series connection mode and coaxially aligned with the input shaft and the output shaft, a structure that the axial motor, the input shaft and the output shaft are coaxially aligned in sequence is formed, the two axial motors are coaxially assembled at the front end of the electric drive system in a series connection mode during assembly, the peripheral space of the electric drive system is not occupied, the radial dimension of the electric drive system is reduced, the integration of the electric drive system is improved, the requirement of the electric drive system on the suspension space height is reduced, the characteristics that the axial dimension of the axial motor is short are utilized, the axial dimension of the whole system is reduced, the electric drive system adapts to the assembly requirements of a narrow rigid frame, and the requirements of vehicle compactness and light weight are met.

Description

Technical Field

[0001] This utility model relates to an axial motor dual-input four-speed electric drive system, belonging to the field of new energy vehicle drive technology. Background Technology

[0002] Multi-motor solutions for new energy trucks have become a hot application area, leading to multi-motor collaborative multi-gear transmission drive technology. This not only reduces system costs but also allows for more precise speed ratio configuration, enabling motors to operate in their most efficient range, improving power flexibility, meeting the demands of high torque output and overall vehicle power, and avoiding power interruption during gear shifts, thus enhancing driving comfort and adaptability to harsh operating conditions. However, as new energy commercial vehicles move towards compactness and lightweight design, the wide-body frames of suspended electric drive systems are gradually being replaced by smaller, narrower rigid frames. This necessitates minimizing the size and weight of the electric drive system while maintaining driving capabilities, thereby reducing the space requirements for its layout. Improving the distribution structure of the gear shafts within the gearbox to enhance structural compactness and reduce the size and weight of the gearbox is the most common method for achieving compactness and lightweighting. However, in existing multi-motor multi-speed transmission systems, most motors are arranged in parallel around the gearbox. After multiple motors are mounted on the gearbox, the required mounting height for the entire electric drive system is still relatively large, and the requirements for mounting space and frame width are still relatively high. In order to adapt to the development trend of new energy commercial vehicles, it is necessary to reduce the size and space occupancy of multi-motor multi-speed transmission systems. Utility Model Content

[0003] The axial motor dual-input four-speed electric drive system provided by this utility model has each four-speed transmission component driven independently by an axial motor, forming two sets of four-speed transmission components with independent drive and shifting, meeting the drive requirements of multi-speed power and shifting without power interruption; the two axial motors are coaxially mounted in series at the front end of the electric drive system, without occupying the outer peripheral space of the electric drive system, making the electric drive system adaptable to the assembly requirements of narrow rigid frames, and meeting the needs of vehicle compactness and lightweighting.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A dual-input four-speed electric drive system for axial motors includes two axial motors, an input shaft connected to the axial motors, a four-speed transmission assembly with four-speed function, and an output shaft meshing with the four-speed transmission assembly. The system is characterized in that the two axial motors are arranged coaxially in series, an input shaft connected to one axial motor extends through the input shaft connected to the other axial motor, each input shaft is connected to a set of four-speed transmission assemblies, the output shaft is coaxially aligned with the input shaft, and the two sets of four-speed transmission assemblies are symmetrically arranged on both sides of the output shaft.

[0005] Preferably, each input shaft has an external spline. One input shaft is a hollow shaft that forms a spline connection with an axial motor. The inner end of the other input shaft passes through the hollow shaft and forms a spline connection with another axial motor. The outer end passes through the hollow shaft and meshes with the four-speed transmission assembly.

[0006] Preferably, the four-speed transmission assembly includes a constant meshing shaft meshing with the input shaft, an intermediate shaft coaxially connected to the constant meshing shaft, a rotatable drive gear mounted on the intermediate shaft, and a sliding sleeve mounted on the intermediate shaft. The number of drive gears is four, and the number of sliding sleeves is two. One sliding sleeve is disposed between two drive gears, and the other sliding sleeve is disposed between two other drive gears. A driven gear is fixed on the output shaft and meshes with the drive gears one-to-one.

[0007] Preferably, the intermediate shaft consists of a front intermediate shaft coaxially connected to the constant meshing shaft and a rear intermediate shaft coaxially connected to the rear end of the front intermediate shaft. The four drive gears are arranged sequentially from back to front: first drive gear, second drive gear, third drive gear, and fourth drive gear. The two sliding sleeves are sliding sleeve one and sliding sleeve two. The fourth and third drive gears are rotatably mounted on the front intermediate shaft, and sliding sleeve one is mounted on the front intermediate shaft and located between the fourth and third drive gears. The second and first drive gears are rotatably mounted on the rear intermediate shaft, and sliding sleeve two is mounted on the rear intermediate shaft and located between the second and first drive gears. The output shaft is fixed with a first driven gear meshing with the first drive gear, a second driven gear meshing with the second drive gear, a third driven gear meshing with the third drive gear, and a fourth driven gear meshing with the fourth drive gear. The outer diameters of the first to fourth driven gears decrease sequentially.

[0008] Preferably, the constant meshing shaft is splined to the front intermediate shaft, and the front intermediate shaft is splined to the rear intermediate shaft.

[0009] The beneficial effects of this utility model are: This utility model discloses a dual-input four-speed electric drive system with two axial motors arranged in series and coaxially. The input shaft connected to one axial motor extends through the input shaft connected to the other axial motor. Each input shaft connects to a set of four-speed transmission components, and each set of four-speed transmission components is independently driven by one axial motor, forming independent drive and shifting of the two sets of four-speed transmission components, meeting the drive requirements of multi-speed power and shifting without power interruption. The two axial motors are arranged in series and coaxially, and the input shaft and output shaft are aligned coaxially, forming a structure in which the axial motors, input shafts, and output shafts are sequentially aligned coaxially. During assembly, the two axial motors are assembled in series and coaxially at the front end of the electric drive system, without occupying the outer peripheral space of the electric drive system, reducing the radial dimension of the electric drive system, improving the integration of the electric drive system, reducing the height requirement of the electric drive system for the mounting space, and utilizing the short axial dimension of the axial motors to reduce the axial dimension of the entire system, making the electric drive system adaptable to the assembly requirements of narrow rigid frames, meeting the needs of vehicle compactness and lightweighting. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the transmission structure of the dual-input four-speed electric drive system for an axial motor in a specific implementation.

[0011] Figure 2 This is a schematic diagram of the transmission when the dual-input four-speed electric drive system of the axial motor is in first gear.

[0012] Figure 3 This is a schematic diagram of the transmission when the dual-input four-speed electric drive system of the axial motor is in second-speed power mode.

[0013] Figure 4 This is a schematic diagram of the transmission when a dual-input four-speed electric drive system for an axial motor is configured to generate three-speed power.

[0014] Figure 5 This is a schematic diagram of the transmission when a dual-input four-speed electric drive system for an axial motor generates four power gears. Detailed Implementation

[0015] The following is combined with Figures 1-5 The embodiments of this utility model will be described in detail below.

[0016] A dual-input four-speed electric drive system for axial motors includes two axial motors 1, an input shaft 2 connected to the axial motors 1, a four-speed transmission assembly 3 with four-speed transmission function, and an output shaft 4 meshing with the four-speed transmission assembly 3. The system is characterized in that the two axial motors 1 are arranged coaxially in series, the input shaft 2 connected to one axial motor 1 extends through the input shaft 2 connected to the other axial motor 1, each input shaft 1 is connected to a set of four-speed transmission assemblies 3, the output shaft 4 is coaxially aligned with the input shaft 2, and the two sets of four-speed transmission assemblies 3 are symmetrically arranged on both sides of the output shaft 4.

[0017] The dual-input four-speed electric drive system with axial motors described above features two axial motors 1 arranged in series and coaxially. An input shaft 2 connected to one axial motor 1 extends through the input shaft 2 connected to the other axial motor 1. Each input shaft 2 connects to a set of four-speed transmission components 3, and each set of four-speed transmission components 3 is independently driven by one axial motor 1, forming independent drive and shifting of the two sets of four-speed transmission components 3, meeting the drive requirements for multi-speed power and shifting without power interruption. The two axial motors 1 are arranged in series and coaxially, with the input shaft 2 and output shaft 4 coaxially aligned, forming a structure where the axial motors, input shafts, and output shafts are sequentially coaxially aligned. During assembly, the two axial motors 1 are assembled in series and coaxially at the front end of the electric drive system, without occupying the outer peripheral space of the electric drive system, reducing the radial dimension of the electric drive system, improving the integration of the electric drive system, reducing the height requirement of the electric drive system for the mounting space, and utilizing the short axial dimension of the axial motor 1 to reduce the axial dimension of the entire system, making the electric drive system adaptable to the assembly requirements of narrow rigid frames, meeting the needs of vehicle compactness and lightweighting.

[0018] Each input shaft 2 has an external spline. One input shaft 2 is a hollow shaft, forming a spline connection with one axial motor 1. The inner end of the other input shaft 2 passes through the hollow shaft and forms a spline connection with another axial motor 1, while the outer end protrudes from the hollow shaft and meshes with the four-speed transmission assembly 3. The external splines on the input shaft 2 are connected to the internal splines on the shaft ends of the axial motors 1, as shown in the figure. The input shaft 2 connected to the axial motor M2 is a hollow shaft, and the two ends of the input shaft 2 connected to the axial motor M1 protrude from the hollow shaft respectively. In the actual structure, the two input shafts 2 are radially supported by bearings. The rotation of the two input shafts 2 is independent and does not interfere with each other. Compared with the parallel arrangement of two motors, the two axial motors are arranged in series and coaxially, which does not occupy radial space, effectively reducing the radial height of the drive system and improving the compactness of the structure.

[0019] The four-speed transmission assembly 3 includes a constant meshing shaft 5 meshing with the input shaft, an intermediate shaft 6 coaxially connected to the constant meshing shaft 5, a rotatable drive gear 7 mounted on the intermediate shaft 6, and a sliding sleeve 8 slidably mounted on the intermediate shaft 6. There are four drive gears 7 and two sliding sleeves 8. One sliding sleeve 8 is positioned between two drive gears 7, and the other is positioned between two other drive gears 7. A corresponding driven gear 9 is fixed on the output shaft 4, meshing one-to-one with each drive gear 7. In the four-speed transmission assembly 3, each of the four drive gears 7 corresponds to a gear. When the sliding sleeve 8 slides axially and engages with a drive gear 7, the power on the intermediate shaft 6 is transmitted to the output shaft 4 via that drive gear 7 and the corresponding driven gear 9. The intermediate shaft pairs of the two sets of four-speed transmission assemblies 3 are positioned on both sides of the output shaft 4, forming a symmetrical transmission structure and improving structural compactness.

[0020] The intermediate shaft 6 consists of a front intermediate shaft 61 coaxially connected to the constant meshing shaft 5 and a rear intermediate shaft 62 coaxially connected to the rear end of the front intermediate shaft 61. The four drive gears 7 are arranged sequentially from back to front: first drive gear 7.1, second drive gear 7.2, third drive gear 7.3, and fourth drive gear 7.4. The two sliding sleeves 8 are sliding sleeve one 8.1 and sliding sleeve two 8.2. The fourth drive gear 7.4 and the third drive gear 7.3 are rotatably mounted on the front intermediate shaft 61, and sliding sleeve one 8.1 is mounted on the front intermediate shaft 61 and located at the fourth drive gear 7.4. Between the third-speed drive gear 7.3, the second-speed drive gear 7.2 and the first-speed drive gear 7.1 are rotatably mounted on the rear intermediate shaft 62. The sliding gear sleeve 8.2 is mounted on the rear intermediate shaft 62 and is located between the second-speed drive gear 7.2 and the first-speed drive gear 7.1. The output shaft 4 is fixed with the first-speed driven gear 4.1 meshing with the first-speed drive gear 7.1, the second-speed driven gear 4.2 meshing with the second-speed drive gear 7.2, the third-speed driven gear 4.3 meshing with the third-speed drive gear 7.3, and the fourth-speed driven gear 4.4 meshing with the fourth-speed drive gear 7.4. The outer diameters of the first to fourth-speed driven gears decrease sequentially. When sliding gear 8.2 slides to the right and engages with the first gear drive gear 7.1, the power of the axial motor is transmitted to the output shaft 4 via the input shaft 2, constant meshing shaft 5, intermediate shaft 6, first gear drive gear 7.1, and first gear driven gear 4.1, forming first gear power. When sliding gear 8.2 slides to the left and engages with the second gear drive gear 7.2, the power of the axial motor is transmitted to the output shaft 4 via the input shaft 2, constant meshing shaft 5, intermediate shaft 6, first gear drive gear 7.2, and second gear driven gear 4.2, forming second gear power. When the sliding gear 8.1 slides to the right and engages with the third-speed drive gear 7.3, the power of the axial motor is transmitted to the output shaft 4 via the input shaft 2, the constant meshing shaft 5, the intermediate shaft 6, the third-speed drive gear 7.3, and the third-speed driven gear 4.3, forming a three-speed power. When the sliding gear 8.1 slides to the left and engages with the fourth-speed drive gear 8.4, the power of the axial motor is transmitted to the output shaft 4 via the input shaft 2, the constant meshing shaft 5, the intermediate shaft 6, the fourth-speed drive gear 7.4, and the third-speed driven gear 4.4, forming a four-speed power, thus realizing the four-speed transmission function.

[0021] The constant meshing shaft 5 is splinedly connected to the front intermediate shaft 61, and the front intermediate shaft 61 is splinedly connected to the rear intermediate shaft 62. Four drive gears are mounted on the intermediate shaft 6. To prevent the intermediate shaft 6 from becoming too long and deformed, thus affecting the transmission effect and improving the convenience of disassembly and assembly, the intermediate shaft 6 is configured as a split structure with the front intermediate shaft 61 and the rear intermediate shaft 62 splinedly connected. The constant meshing shaft 6 is splinedly connected to the front intermediate shaft 61, achieving a coaxial connection between the constant meshing shaft 5 and the intermediate shaft 6, ensuring transmission reliability and ease of assembly.

[0022] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. An axial motor dual-input four-speed electric drive system, comprising two axial motors, an input shaft connected to the axial motors, a four-speed transmission assembly with four-speed transmission function, and an output shaft meshing with the four-speed transmission assembly, characterized in that: The two axial motors are arranged in series and coaxially. The input shaft connected to one axial motor passes through the input shaft connected to the other axial motor. Each input shaft is connected to a set of four-speed transmission components. The output shaft is coaxially aligned with the input shaft. The two sets of four-speed transmission components are symmetrically arranged on both sides of the output shaft.

2. The axial motor dual-input four-speed electric drive system according to claim 1, characterized in that: Each input shaft has an external spline. One input shaft is a hollow shaft that forms a spline connection with an axial motor. The inner end of the other input shaft passes through the hollow shaft and forms a spline connection with another axial motor. The outer end passes through the hollow shaft and meshes with the four-speed transmission assembly.

3. The axial motor dual-input four-speed electric drive system according to claim 1, characterized in that: The four-speed transmission assembly includes a constant meshing shaft that meshes with the input shaft, an intermediate shaft coaxially connected to the constant meshing shaft, a rotatable drive gear mounted on the intermediate shaft, and a sliding sleeve mounted on the intermediate shaft. There are four drive gears and two sliding sleeves. One sliding sleeve is located between two drive gears, and the other sliding sleeve is located between two other drive gears. Driven gears that mesh with the drive gears are fixed on the output shaft.

4. The axial motor dual-input four-speed electric drive system according to claim 3, characterized in that: The intermediate shaft consists of a front intermediate shaft coaxially connected to the constant meshing shaft and a rear intermediate shaft coaxially connected to the rear end of the front intermediate shaft. The four drive gears are arranged sequentially from back to front: first drive gear, second drive gear, third drive gear, and fourth drive gear. The two sliding sleeves are sliding sleeve one and sliding sleeve two. The fourth and third drive gears are rotatably mounted on the front intermediate shaft, and sliding sleeve one is mounted on the front intermediate shaft and located between the fourth and third drive gears. The second and first drive gears are rotatably mounted on the rear intermediate shaft, and sliding sleeve two is mounted on the rear intermediate shaft and located between the second and first drive gears. The output shaft is fixed with a first driven gear meshing with the first drive gear, a second driven gear meshing with the second drive gear, a third driven gear meshing with the third drive gear, and a fourth driven gear meshing with the fourth drive gear. The outer diameters of the first to fourth driven gears decrease sequentially.

5. The axial motor dual-input four-speed electric drive system according to claim 4, characterized in that: The constant meshing shaft is splined to the front intermediate shaft, and the front intermediate shaft is splined to the rear intermediate shaft.

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