Double-speed electric drive axle system for loader

Abstract

The double-speed electric drive axle system comprises a two-gear reduction gearbox, an input shaft assembly, a gear shifting structure and an output shaft assembly, the input shaft assembly, the gear shifting structure and the output shaft assembly are sequentially connected, the input shaft assembly is arranged at the upper end of the two-gear reduction gearbox, and the output shaft assembly is arranged at the lower end of the two-gear reduction gearbox. The input shaft assembly connector and the output shaft assembly connector are both arranged on the left side of the two-gear reduction gearbox. The motor is connected with the input shaft assembly; the drive axle body assembly corresponds to the output shaft assembly, the output shaft assembly is connected with the input end of the main speed reducer, the motor is arranged above the drive axle body assembly, the two-gear reduction gearbox is correspondingly arranged on the right side of the motor and the drive axle body assembly, and gears of the two-gear reduction gearbox are adjusted through the gear shifting structure so as to adjust the output rotating speed. The adaptability of the loader to working conditions is improved by adding the electric two-gear reduction gearbox to the drive axle system, the space utilization rate is improved by adopting the rear-mounted motor through the structural design, and the whole vehicle structure is more compact.

Description

Technical Field

[0001] This utility model relates to the field of loader technology, and in particular to a dual-speed electric drive axle system for loaders. Background Technology

[0002] Current loader drive axle systems typically have only one gear, which cannot flexibly switch gears under different working conditions, increasing energy consumption and affecting the driving experience. Drive axle systems with two gearboxes are structurally complex, significantly increasing the size of the drive axle system, making the vehicle larger, reducing its maneuverability, and increasing overall cost. Therefore, how to increase the number of drive axle gears while controlling the overall size has become an urgent problem to be solved. Utility Model Content

[0003] The purpose of this invention is to provide a dual-speed electric drive axle system for loaders, which aims to solve the problems of large size and poor flexibility of existing drive axle systems by structural design.

[0004] To solve the above-mentioned technical problems, this utility model provides a dual-speed electric drive axle system for a loader, comprising: a two-speed reduction gearbox, including an input shaft assembly, a shifting structure, and an output shaft assembly connected in sequence, wherein the input shaft assembly is located at the upper end of the two-speed reduction gearbox, and the output shaft assembly is located at the lower end of the two-speed reduction gearbox; the connection ports of the input shaft assembly and the output shaft assembly are both located on the left side of the two-speed reduction gearbox; a motor, including a motor shaft, the motor corresponding to the input shaft assembly, and the motor shaft being connected to the input shaft assembly; a drive axle assembly, including a main reducer and wheel-side reducers located on both sides of the main reducer; power is transmitted from the main reducer to the wheel-side reducers; the drive axle assembly corresponds to the output shaft assembly, and the output shaft assembly is connected to the input end of the main reducer, such that the motor is located above the drive axle assembly; the two-speed reduction gearbox is correspondingly located on the right side of the motor and the drive axle assembly; the output speed is adjusted by changing the gears of the two-speed reduction gearbox through the shifting structure.

[0005] Furthermore, the shifting structure includes: an intermediate shaft assembly, which is connected to the input shaft assembly via gear meshing; an intermediate connecting shaft assembly, which is connected to the intermediate shaft assembly via gear meshing, and is also connected to the output shaft assembly via gear meshing; and a shifting cylinder, which is connected to the output shaft assembly, and the shifting cylinder adjusts the gear position by adjusting the gear meshing relationship of the output shaft assembly.

[0006] Furthermore, the input shaft assembly, the intermediate shaft assembly, the intermediate connecting shaft assembly, and the output shaft assembly are distributed sequentially from top to bottom, such that the input shaft assembly corresponds to the motor shaft, and the output shaft assembly is connected to the input end of the main reducer.

[0007] Further, the input shaft assembly includes an input shaft and an input gear mounted on the input shaft; the intermediate shaft assembly includes an intermediate shaft and a first intermediate gear and a second intermediate gear mounted on the intermediate shaft; the intermediate connecting shaft assembly includes an intermediate connecting shaft and a first connecting gear and a second connecting gear mounted on the intermediate connecting shaft; the output shaft assembly includes an output shaft and a first output gear and a second output gear mounted on the output shaft; wherein, the input gear, the first intermediate gear, the first connecting gear, and the first output gear are sequentially meshed; the second intermediate gear, the second connecting gear, and the second output gear are sequentially meshed; the shift cylinder controls the output shaft assembly to be fixedly connected to one of the first output gear and the second output gear to change the output gear.

[0008] Furthermore, the output shaft assembly also includes a shift ring, which is slidable between a first gear position connecting the output shaft to the first output gear and a second gear position connecting the output shaft to the second output gear.

[0009] Furthermore, the output shaft assembly also includes a transition sleeve, which is connected to the output shaft assembly and disposed between the first output gear and the second output gear. The shift ring is sleeved outside the transition sleeve. In the first gear position, the shift ring connects the transition sleeve and the first output gear; in the second gear position, the shift ring connects the transition sleeve and the second output gear.

[0010] Furthermore, the shift cylinder also includes a shift shaft and a shift fork. The shift fork connects the shift shaft and the shift ring. The shift shaft moves in a direction parallel to the output shaft assembly to control the shift fork to drive the shift ring to switch between first gear and second gear.

[0011] Furthermore, the outer wall of the transition sleeve is provided with a transition spline, and the first output gear and the second output gear are provided with connecting splines corresponding to the transition splines. The shift ring is provided with a corresponding adapter spline. In the first gear position, the adapter spline connects the transition spline with the connecting spline of the first output gear. In the second gear position, the adapter spline connects the transition spline with the connecting spline of the second output gear.

[0012] Furthermore, both the first output gear and the second output gear are provided with composite bushings between themselves and the output shaft.

[0013] Furthermore, the two-speed gearbox also includes: a housing, the inner wall of which is provided with multiple bearing positions, and the input shaft, the output shaft, the intermediate shaft and the intermediate connecting shaft are all fixedly mounted on the housing by bearings.

[0014] Implementing the embodiments of this utility model will have the following beneficial effects:

[0015] 1. An electric two-speed reduction gearbox is installed at the input end of the main reducer of the drive axle to increase the number of gears in the drive axle, making the loader more flexible for different working conditions.

[0016] 2. By designing the structure, the motor is positioned above the drive axle assembly, and the two-speed reduction gearbox is located on the right side of the motor and drive axle assembly, making the overall structure more compact, improving space utilization, reducing overall volume, and lowering overall cost.

[0017] 3. The shifting structure is connected to the output shaft assembly, and the sliding shifting ring is controlled by the hydraulic cylinder and shift fork to adjust the gear position gear connected to the output shaft assembly to achieve shifting. The structure is simple, the operation is convenient, and it occupies little space. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a dual-speed electric drive axle system provided in an embodiment of the present disclosure;

[0020] Figure 2 This is a schematic diagram of the external structure of a two-speed gearbox provided in an embodiment of the present disclosure;

[0021] Figure 3 For along Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0022] Figure 4 This is a schematic diagram of the external structure of a two-speed gearbox provided in another embodiment of the present disclosure;

[0023] Figure 5 For along Figure 4 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0024] Figure 6 This is a schematic diagram of the installation structure of a dual-speed electric drive axle system provided in an embodiment of the present disclosure;

[0025] Figure 7 This is a schematic diagram of the internal structure of a two-speed gearbox provided in an embodiment of the present disclosure;

[0026] Figure 8 This is a schematic diagram of the external structure of a dual-speed electric drive axle system provided in an embodiment of the present disclosure;

[0027] Figure 9 This is a schematic diagram of a motor structure provided in an embodiment of the present disclosure;

[0028] Figure 10 This is an exploded view of an output shaft assembly provided in one embodiment of the present disclosure.

[0029] Reference numerals: 10. Dual-speed electric drive axle system; 11. Two-speed reduction gearbox; 111. Input shaft; 1111. Input gear; 112. Shifting structure; 112A. Intermediate shaft; 112B. First intermediate gear; 112C. Second intermediate gear; 112D. Intermediate connecting shaft; 112E. First connecting gear; 112F. Second connecting gear; 112G. Shift cylinder; 112H. Gear engagement shaft; 112I. Shift fork; 113. Output shaft ; 113A, First output gear; 113B, Second output gear; 113C, Gear shift ring; 113D, First gear position; 113E, Second gear position; 113F, Transition bushing; 113G, Transition spline; 113H, Connecting spline; 114, Composite bushing; 12, Motor; 121, Motor shaft; 13, Drive axle assembly; 131, Main reducer; 132, Wheel-side reducer; 14, Housing; 141, Bearing seat; 15, Bearing. Detailed Implementation

[0030] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Existing loader drive axle systems typically have only one gear, limiting flexibility in different operating conditions. This not only increases energy consumption but also negatively impacts the driving experience. Drive axle systems with two-speed gearboxes are structurally complex, significantly increasing their size and overall vehicle size, reducing maneuverability, and increasing overall cost. Therefore, increasing the number of drive axle gears while controlling overall size is a pressing issue. This application addresses this by adding an electric two-speed reduction gearbox to the input end of the drive axle's main reducer, increasing the number of drive axle gears and making the loader more flexible for different operating conditions. The motor is positioned above the drive axle assembly, and the two-speed reduction gearbox is located on the right side of both the motor and the drive axle assembly, resulting in a more compact structure, improved space utilization, reduced overall size, and lower overall cost. The shifting mechanism is connected to the output shaft assembly, and a hydraulic cylinder and shift fork control a sliding shift ring to adjust the gears connected to the output shaft assembly, achieving gear shifting. This design is simple, easy to operate, and requires minimal space.

[0034] Combination Figures 1 to 10As shown, this disclosure provides a dual-speed electric drive axle system 10 for a loader. It includes a two-speed reduction gearbox 11, a motor 12, and a drive axle assembly 13. The two-speed reduction gearbox includes high and low gears, which are switched via a gear transmission system. The two-speed reduction gearbox 11 includes an input shaft assembly, a shifting structure 112, and an output shaft assembly connected in sequence. The input shaft assembly is located at the upper end of the two-speed reduction gearbox 11, and the output shaft assembly is located at the lower end. The connection ports of both the input shaft assembly and the output shaft assembly are located on the left side of the two-speed reduction gearbox 11. The motor 12 includes a motor shaft 121, which corresponds to and is connected to the input shaft assembly. The drive axle assembly 13 includes a main reducer 131 and wheel-side reducers 132 located on both sides of the main reducer. Power is transmitted from the main reducer 131 to the wheel-side reducers 132. The main reducer 131 includes an input end, and the drive axle assembly 13 corresponds to the output shaft assembly. The output end of the output shaft assembly is connected to the input end of the main reducer 131. The motor 12 is located above the drive axle assembly 13, and two-speed reduction gearboxes 11 are located to the right of the motor 12 and the drive axle assembly 13, respectively. The output speed is adjusted by changing the gears of the two-speed reduction gearboxes 11 through the shifting structure 112. The motor 12 transmits power from the motor shaft 121 to the input end of the input shaft assembly, driving the gears in the input shaft assembly to rotate. The power is then transmitted to the output shaft assembly through the gear transmission system, and from the output end of the output shaft assembly to the main reducer 131, and finally to the wheel-side reducer 132. The two-speed reduction gearboxes can switch between high and low speeds through gear meshing, ensuring that the speed ultimately transmitted to the wheel-side reducer 132 is at different speeds. By using a gear structure design, the motor 12 and the drive axle assembly 13 are positioned on the left side of the two-speed reduction gearbox 11, and the motor 12 is positioned above the drive axle assembly 13. This reduces the left-right dimensions of the dual-speed electric drive axle system 10, utilizes the space above the drive axle assembly 13, and positions the housing 14 of the two-speed reduction gearbox 11 on the right side of the motor 12 and the drive axle assembly 13. Furthermore, the vertical dimensions of the two-speed reduction gearbox 11 are smaller than the sum of the vertical dimensions of the motor 12 and the drive axle assembly 13, resulting in a compact overall structure.

[0035] Combination Figures 1 to 7As shown, the shifting structure 112 includes an intermediate shaft assembly, an intermediate connecting shaft assembly, and a shifting cylinder 112G. The intermediate shaft assembly includes an intermediate shaft 112A, and the input shaft assembly includes an input shaft 111. The intermediate shaft 112A and input shaft 111 are connected via gear meshing. The motor 12 drives the input gear 1111 of the input shaft assembly to rotate, and the input gear 1111 drives the gear of the intermediate shaft assembly to rotate. The intermediate connecting shaft assembly includes an intermediate connecting shaft 112D, and the intermediate connecting shaft assembly is connected to the intermediate shaft assembly via gear meshing, causing the intermediate shaft 112A to drive the intermediate connecting shaft 112D to rotate. The output shaft assembly includes an output shaft 113, and the intermediate connecting shaft assembly is connected to the output shaft assembly via gear meshing. The rotation of the intermediate connecting shaft 112D drives the output shaft 113 to rotate, thus generating output power. The shifting cylinder 112G is installed in the housing 14 of the two-speed reduction gearbox 11 and connected to the output shaft assembly. The shifting cylinder 112G adjusts the gear position by adjusting the gear meshing relationship of the output shaft assembly.

[0036] Combination Figures 2 to 9 As shown, the input shaft assembly, intermediate shaft assembly, intermediate connecting shaft assembly, and output shaft assembly are arranged sequentially from top to bottom, with the input shaft assembly corresponding to the motor shaft 121 and the output shaft assembly corresponding to the input end of the main reducer 131. Different sized gears can be installed by adjusting the axial distance between the input shaft 111, intermediate shaft 112A, intermediate connecting shaft 112D, and output shaft 113 to achieve different transmission ratios.

[0037] Combination Figures 2 to 7As shown, the input shaft assembly includes an input shaft 111 and an input gear 1111 mounted on the input shaft 111. The intermediate shaft assembly includes an intermediate shaft 112A and a first intermediate gear 112B and a second intermediate gear 112C mounted on the intermediate shaft 112A. The intermediate connecting shaft assembly includes an intermediate connecting shaft 112D and a first connecting gear 112E and a second connecting gear 112F mounted on the intermediate connecting shaft 112D. The output shaft assembly includes an output shaft 113 and a first output gear 113A and a second output gear 113B mounted on the output shaft 113. The input gear 1111, the first intermediate gear 112B, the first connecting gear 112E, and the first output gear 113A are sequentially meshed together. The first intermediate gear 112B and the second intermediate gear 112C are arranged side-by-side in the left-right direction. The first intermediate gear 112B meshes with the input gear 1111, which drives the first intermediate gear 112B to rotate. The second intermediate gear 112C is coaxially fixed with the first intermediate gear 112B, so that the second intermediate gear 112C rotates together with the first intermediate gear 112B. The first intermediate gear 112B drives the first connecting gear 112E to rotate, which in turn drives the first output gear 113A to rotate, achieving first gear output. The second intermediate gear 112C drives the second connecting gear 112F, which in turn drives the second output gear 113B to rotate, achieving second gear output. The shift cylinder 112G controls the output shaft assembly to be fixedly connected to one of the first output gear 113A or the second output gear 113B to change the output gear. Input gear 1111, first intermediate gear 112B, second intermediate gear 112C, first connecting gear 112E, and second connecting gear 112F are all fixedly mounted on their respective shafts. Therefore, during operation, input gear 1111, first intermediate gear 112B, second intermediate gear 112C, first connecting gear 112E, and second connecting gear 112F all rotate. Since the first output gear 113A and second output gear 113B are not fixedly mounted to the output shaft assembly, when the first output gear 113A and second output gear 113B are driven to rotate, the shift cylinder 112G controls one of the first output gear 113A and second output gear 113B to be fixed to the output shaft 113, thereby driving the output shaft 113 to output different speeds.

[0038] Combination Figures 2 to 10As shown, the output shaft assembly also includes a shift ring 113C, which can slide between the first gear position 113D connecting the output shaft 113 and the first output gear 113A and the second gear position 113E connecting the output shaft 113 and the second output gear 113B. The first output gear 113A and the second output gear 113B are rotatably connected to the output shaft 113. The retaining ring 113C is installed on the output shaft 113 and positioned between the first output gear 113A and the second output gear 113B. The retaining ring 113C can slide between the first output gear 113A and the second output gear 113B. The retaining ring 113C is provided with an internal spline. The first output gear 113A, the second output gear 113B, and the output shaft 113 are all provided with corresponding external splines of the retaining ring 113C. The retaining ring 113C can simultaneously connect the first output gear 113A to the output shaft 113 or the second output gear 113B to the output shaft 113, so that the first output gear 113A drives the output shaft 113 to rotate or the second output gear 113B drives the output shaft 113 to rotate.

[0039] Combination Figures 2 to 10 As shown, the output shaft assembly also includes a transition sleeve 113F, which is connected to the output shaft assembly and positioned between the first output gear 113A and the second output gear 113B. A shift ring 113C is sleeved outside the transition sleeve 113F. In the first gear position 113D, the shift ring 113C connects the transition sleeve 113F to the first output gear 113A. In the second gear position 113E, the shift ring 113C connects the transition sleeve 113F to the second output gear 113B. The transition sleeve 113F is provided with an internal spline and is connected to the output shaft 113 via a spline. The outer wall of the transition sleeve 113F is provided with an external spline, namely the transition spline 113G. The first output gear 113A and the second output gear 113B are provided with a connecting spline 113H corresponding to the transition spline 113G. The shift ring is provided with a corresponding matching spline. The transition spline 113G is connected to the connecting spline 113H of the first output gear 113A and the second output gear 113B. The shift ring 113C is provided with an internal spline and is sleeved on the outside of the transition sleeve 113F, which is adapted to the external spline of the transition sleeve 113F. The shift ring 113C slides along the axial direction of the output shaft 113. In the first gear position 113D, the matching spline of the shift ring 113C is simultaneously connected to the connecting spline 113H of the first output gear 113A and the transition spline 113G of the transition sleeve 113F to fix the first output gear 113A and the output shaft 113. In the second gear position 113E, the adapter spline of the gear shift ring 113C is simultaneously connected to the connecting spline 113H of the second output gear 113B and the transition spline 113G of the transition sleeve 113F to fix the second output gear 113B and the output shaft 113.

[0040] Combination Figures 2 to 5As shown, the shift cylinder 112G also includes a shift shaft 112H and a shift fork 112I. The shift fork 112I connects the shift shaft 112H and the shift ring 113C. The shift shaft 112H moves in the direction parallel to the output shaft assembly to control the shift fork 112I to drive the shift ring 113C to switch between first gear position 113D and second gear position 113E. One end of the shift fork 112I is connected to the shift shaft 112H, and the other end is connected to the shift ring 113C. The shift cylinder 112G controls the shift shaft 112H to move, driving the shift ring 113C to move, thereby connecting the output shaft 113 to the first output gear 113A or the second output gear 113B.

[0041] Combination Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 10 As shown, a composite bushing 114 is provided between the first output gear 113A and the second output gear 113B and the output shaft 113. The first output gear 113A is sleeved on the composite bushing 114, which is sleeved on the output shaft 113. The second output gear 113B is sleeved on the composite bushing 114, which is sleeved on the output shaft 113. This ensures that there is a certain amount of friction between the first output gear 113A and the second output gear 113B and the output shaft 113, but the friction is insufficient to drive the output shaft 113 to rotate, and also prevents the first output gear 113A and the second output gear 113B from moving relative to the output shaft 113.

[0042] Combination Figure 5 As shown, the two-speed gearbox 11 also includes a housing 14. The inner wall of the housing 14 is provided with multiple bearing seats 141. The input shaft 111, output shaft 113, intermediate shaft 112A, and intermediate connecting shaft 112D are all fixedly mounted on the housing 14 by bearings 15. Bearings 15 are installed at both ends of the input shaft 111, output shaft 113, intermediate shaft 112A, and intermediate connecting shaft 112D. The housing 14 is provided with bearing seats 141 at both ends of the input shaft 111, both ends of the output shaft 113, both ends of the intermediate shaft 112A, and both ends of the intermediate connecting shaft 112D to place the corresponding bearings 15 to support the corresponding shafts.

[0043] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations, and individual components and functions are optional unless explicitly required, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the terms “comprise” and its variations “comprises” and / or “comprising” refer to the presence of stated features, integrals, steps, operations, elements, and / or systems, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, systems, and / or groups thereof. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method portion disclosed in the embodiments, then the relevant parts can be referred to the description of the method portion. 0034. The above-described embodiments only illustrate several implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. The technical features of the above-described embodiments can be arbitrarily combined. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; however, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-speed electric drive axle system for a loader, characterized in that, include: The two-speed gearbox (11) includes an input shaft assembly, a shifting structure (112) and an output shaft assembly connected in sequence. The input shaft assembly is located at the upper end of the two-speed gearbox (11), and the output shaft assembly is located at the lower end of the two-speed gearbox (11). The connection ports of the input shaft assembly and the output shaft assembly are both located on the left side of the two-speed gearbox (11). A motor (12) includes a motor shaft (121), the motor (12) corresponding to the input shaft assembly, and the motor shaft (121) being connected to the input shaft assembly; The drive axle assembly (13) includes a main reducer (131) and wheel-side reducers (132) located on both sides of the main reducer; power is transmitted from the main reducer (131) to the wheel-side reducers (132); the drive axle assembly (13) corresponds to the output shaft assembly, the output shaft assembly is connected to the input end of the main reducer (131), so that the motor (12) is located above the drive axle assembly (13), and the two-speed gearbox (11) is located on the right side of the motor (12) and the drive axle assembly (13), and the output speed is adjusted by adjusting the gear of the two-speed gearbox (11) through the shifting structure (112).

2. The dual-speed electric drive axle system for a loader according to claim 1, characterized in that, The shifting structure (112) includes: An intermediate shaft assembly, which is connected to the input shaft assembly via gear meshing; An intermediate connecting shaft assembly is connected to the intermediate shaft assembly via gear meshing, and the intermediate connecting shaft assembly is also connected to the output shaft assembly via gear meshing. A shift cylinder (112G) is connected to the output shaft assembly. The shift cylinder (112G) adjusts the gear position by adjusting the gear meshing relationship of the output shaft assembly.

3. The dual-speed electric drive axle system for a loader according to claim 2, characterized in that, The input shaft assembly, the intermediate shaft assembly, the intermediate connecting shaft assembly, and the output shaft assembly are arranged sequentially from top to bottom, such that the input shaft assembly corresponds to the motor shaft (121), and the output shaft assembly is connected to the input end of the main reducer (131).

4. The dual-speed electric drive axle system for a loader according to claim 2, characterized in that, The input shaft assembly includes an input shaft (111) and an input gear (1111) mounted on the input shaft (111). The intermediate shaft assembly includes an intermediate shaft (112A) and a first intermediate gear (112B) and a second intermediate gear (112C) mounted on the intermediate shaft (112A); The intermediate connecting shaft assembly includes an intermediate connecting shaft (112D) and a first connecting gear (112E) and a second connecting gear (112F) mounted on the intermediate connecting shaft (112D). The output shaft assembly includes an output shaft (113) and a first output gear (113A) and a second output gear (113B) mounted on the output shaft (113); The input gear (1111), the first intermediate gear (112B), the first connecting gear (112E), and the first output gear (113A) are sequentially meshed and connected; the second intermediate gear (112C), the second connecting gear (112F), and the second output gear (113B) are sequentially meshed and connected. The shift cylinder (112G) controls the output shaft assembly to be fixedly connected to one of the first output gear (113A) and the second output gear (113B) to change the output gear.

5. The dual-speed electric drive axle system for a loader according to claim 4, characterized in that, The output shaft assembly also includes a shift ring (113C) that is slidable between a first gear position (113D) connecting the output shaft (113) to the first output gear (113A) and a second gear position (113E) connecting the output shaft (113) to the second output gear (113B).

6. The dual-speed electric drive axle system for a loader according to claim 5, characterized in that, The output shaft assembly further includes a transition sleeve (113F), which is connected to the output shaft assembly and disposed between the first output gear (113A) and the second output gear (113B). The shift ring (113C) is sleeved on the transition sleeve (113F). In the first gear position (113D), the shift ring (113C) connects the transition sleeve (113F) and the first output gear (113A); in the second gear position (113E), the shift ring (113C) connects the transition sleeve (113F) and the second output gear (113B).

7. The dual-speed electric drive axle system for a loader according to claim 6, characterized in that, The shift cylinder (112G) also includes a shift shaft (112H) and a shift fork (112I). The shift fork (112I) connects the shift shaft (112H) and the shift ring (113C). The shift shaft (112H) moves in a direction parallel to the output shaft assembly to control the shift fork (112I) to drive the shift ring (113C) to switch between first gear (113D) and second gear (113E).

8. The dual-speed electric drive axle system for a loader according to claim 7, characterized in that, The outer wall of the transition sleeve (113F) is provided with a transition spline (113G). The first output gear (113A) and the second output gear (113B) are provided with connecting splines (113H) corresponding to the transition spline (113G). The shift ring is provided with a corresponding adapter spline. In the first gear position (113D), the adapter spline connects the transition spline (113G) with the connecting spline (113H) of the first output gear (113A). In the second gear position (113E), the adapter spline connects the transition spline (113G) with the connecting spline (113H) of the second output gear (113B).

9. The dual-speed electric drive axle system for a loader according to claim 7, characterized in that, Both the first output gear (113A) and the second output gear (113B) are provided with a composite bushing (114) between them and the output shaft (113).

10. The dual-speed electric drive axle system for a loader according to any one of claims 4 to 9, characterized in that, The two-speed gearbox (11) further includes a housing (14), the inner wall of which is provided with multiple bearing positions (141), and the input shaft (111), the output shaft (113), the intermediate shaft (112A) and the intermediate connecting shaft (112D) are all fixedly mounted on the housing (14) by bearings (15).

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