Compact power system and electric forklift

Abstract

The invention discloses a compact power system and an electric forklift, and relates to the technical field of industrial vehicles. The system specifically comprises a reduction gearbox, a traction motor, a hydraulic motor, a differential assembly and a hydraulic pump, and the reduction gearbox is provided with a first power input face, a second power input face, a first power output face and a second power output face, the traction motor and the hydraulic motor are connected to the first power input face and the second power input face respectively. The differential assembly and the hydraulic pump are connected to the first power output face and the second power output face respectively. The first power output surface is jointly adjacent to the first power input surface and the second power input surface; the second power output face and the second power input face are located on the same side of the reduction gearbox. All the components are tightly attached to the periphery of the reduction gearbox, the compactness of the whole structure is improved, meanwhile, electrical connection is simplified, and when the power system is installed on a chassis of a vehicle body, more spaces for containing batteries are reserved on the chassis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial vehicles, in particular to a compact power system and an electric forklift. BACKGROUND

[0002] The power system is the transmission core component of the electric forklift. The common traction power system of the electric forklift mainly adopts battery power supply, drives the forklift to run through the electric motor, provides more stable power output and faster acceleration performance, and meets the needs of the forklift under different working conditions. The gear pump converts the mechanical energy of the electric motor into hydraulic energy to provide power for the working device of the forklift, such as the lifting and tilting of the forks and the steering system.

[0003] In the prior art, large-tonnage electric forklifts often adopt a split layout: the traction reduction box and the traction motor are close to the drive axle to form a traction power unit; the hydraulic motor and the traction motor are integrated on the vehicle body; the battery pack, the traction motor controller and the hydraulic motor controller are placed on the vehicle body in sequence, as shown in Figure 1

[0004] However, this traditional layout has significant shortcomings: the key units (traction reduction box, traction motor, hydraulic motor, etc.) are distributed dispersedly on the vehicle, resulting in complex electrical connection, long and many wire harnesses. This not only increases the electrical energy loss, but also reduces the anti-interference ability. At the same time, each split unit occupies a lot of space in the vehicle, limits the size of the battery pack, and makes it impossible to accommodate large-capacity batteries, thereby shortening the endurance time of the forklift.

[0005] In view of this, the present application aims to solve the problems of complex electrical connection and limited battery capacity of the electric forklift due to the dispersed layout of each unit. SUMMARY

[0006] The main purpose of the present application is to provide a compact power system and an electric forklift, which aims to optimize the compact layout of each key unit on the vehicle body, simplify the electrical connection, and increase the reserved space for the battery on the vehicle body.

[0007] In order to achieve the above purpose, the present application provides a compact power system, comprising: a reduction box having opposite first and second power input faces and first and second power output faces; a traction motor and a hydraulic motor connected to the first and second power input faces, respectively; a differential assembly and a hydraulic pump connected to the first and second power output faces, respectively; ​The first power output surface is adjacent to the first power input surface and the second power input surface; the second power output surface is on the same side of the reduction box as the second power input surface, and the traction motor and the hydraulic motor drive the differential assembly and the hydraulic pump respectively through the reduction box.

[0008] Further, a motor controller is included, which is arranged above the traction motor and connected to the first power input surface of the reduction box.

[0009] Further, the traction motor, the hydraulic motor, the motor controller, and the hydraulic pump are respectively arranged at the edges of the reduction box, and together with the reduction box form a rectangular shape or a parallelogram shape.

[0010] Further, the second power output surface is above the second power input surface.

[0011] Further, the reduction box includes a reduction box housing and a traction reduction unit and a hydraulic reduction unit built-in the reduction box housing, the traction motor drives the differential assembly through the traction reduction unit, and the hydraulic motor drives the hydraulic pump through the hydraulic reduction unit.

[0012] Further, the traction reduction unit includes a shaft gear set, a second shaft gear set, and a third shaft gear set which are sequentially and parallel transmitted to the inner wall of the reduction box housing, and the output end of the third shaft gear set drives the differential assembly.

[0013] Further, the hydraulic reduction unit includes an input shaft and an output shaft built-in the reduction box housing, one end of the input shaft is connected to the output end of the hydraulic motor, and one end of the output shaft is connected to the input end of the hydraulic motor, and the outer walls of the input shaft and the output shaft are respectively provided with input gears and output gears which are transmitted to each other.

[0014] Further, the hydraulic reduction unit includes an intermediate shaft and an idler wheel built-in the reduction box housing, the idler wheel is installed on the outer wall of the intermediate shaft, and the input gears and the output gears are both engaged with the idler wheel.

[0015] Further, the traction motor and the hydraulic motor are both at the bottom end of the reduction box, the traction reduction unit is arranged upward along the edge of the reduction box from the traction motor, and the hydraulic reduction unit is arranged upward along the edge of the reduction box from the hydraulic motor.

[0016] The application also discloses an electric forklift provided with the compact power system.

[0017] The above technical scheme has the following advantages: The traction motor, the hydraulic motor, the differential assembly and the hydraulic pump are distributed on different power input surfaces and power output surfaces of the reduction gearbox, the components are closely attached to the periphery of the reduction gearbox, and there is no interference between the components, which not only improves the compactness of the overall structure, but also simplifies the electrical connection.

[0018] The input gear, the idler gear and the output gear are used to mesh and drive in the hydraulic reduction unit, sufficient clearance is reserved between the hydraulic pump and the hydraulic motor to prevent interference during integrated assembly. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be described in detail below with reference to specific embodiments and drawings, in which: Figure 1 The figure is a structural schematic diagram of the prior art of the application; Figure 2 The figure is a structural layout schematic diagram of the application; Figure 3 The figure is a first perspective view of the application cooperating with the drive axle; Figure 4 The figure is a second perspective view of the application cooperating with the drive axle; Figure 5 The figure is an exploded view of the application cooperating with the drive axle; Figure 6 The figure is a transmission schematic diagram of the reduction gearbox of the application; Figure 7 The figure is a transmission schematic diagram of the traction reduction unit of the application; Figure 8 The figure is a transmission schematic diagram of the hydraulic reduction unit of the application; Figure 9 The figure is a structural diagram of the traction reduction unit of the application; Figure 10 The figure is a structural diagram of the hydraulic reduction unit of the application; Figure 11 The figure is a forward structural diagram of the traction reduction unit of the application; Figure 12The forward structure diagram of the hydraulic reduction unit of the application; Figure 13 The structure diagram of the differential assembly removal of the application; Figure 14 The forward structure diagram of the differential assembly removal of the application.

[0020] In the figure: 101, drive axle; 1012, drive axle left half shaft; 1013, drive axle right half shaft; 1014, toothed flange face; 102, integrated power system; 1021, motor controller; 1022, traction motor; 1023, reduction box; 1024, hydraulic pump; 1025, hydraulic motor; 1026, differential assembly; 1027, reduction box flange face; 104, battery pack; 2301, spline shaft; 2302, first shaft body; 2303, driving gear; 2304, output gear; 2305, output shaft; 2306, idler gear; 2307, intermediate shaft; 2310, input shaft; 2311, input gear; 2312, two-axis driven gear; 2313, second shaft body; 2314, third shaft body; 2315, three-axis driven gear; 2317, traction gear; 2318, three-axis driving gear; 2319, two-axis driving gear; 2350, traction reduction unit; 2360, hydraulic reduction unit; 2370, reduction box housing. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the application more clear, the application will be described in detail below in combination with the drawings and examples. It should be understood that the following specific examples are only used to explain the application and do not constitute a limitation on the application.

[0022] In the prior art, a front drive axle 101 and a rear steering axle are respectively installed at the front and rear ends of the forklift chassis, and a traction reduction box 1023 and a traction motor 1022 are dispersedly installed between the front drive axle 101 and the rear steering axle, so that the traction reduction box 1023 and the traction motor 1022 are installed at the front drive axle 101, realizing the traction and auxiliary steering functions of the forklift, the hydraulic pump 1024 and the hydraulic motor 1025 are combined and distributed in the independent area of the chassis of the forklift, participating in the lifting function of the forks, the battery pack 104 is installed in the middle area of the chassis, also occupying an independent area of the chassis, playing a power supply role for the forklift, and the motor controller 1021 is installed side by side at the rear of the forklift chassis, playing a role of adjusting the hydraulic motor 1025 and the traction motor 1022.

[0023] In the above scheme, there are many technical problems: 1) the arrangement of each unit is scattered, and additional installation points need to be added; 2) each unit is large in size and occupies a lot of space in the vehicle; 3) the electrical connection between each unit is complex, with many and long wire harnesses, which is easy to cause power loss and poor anti-interference ability; 4) due to the occupation of a large amount of space in the vehicle by each split unit, the size of the battery pack is limited, large capacity batteries cannot be installed, and the vehicle running time is short.

[0024] As shown in Figures 2-4 , Figures 9-11 The present application proposes an improved compact power system, i.e. the integrated power system 102 of the present application, which comprises a reduction gearbox 1023, a traction motor 1022, a hydraulic motor 1025, a differential assembly 1026 and a hydraulic pump 1024. The reduction gearbox 1023 has opposite first and second power input faces, and also has first and second power output faces. The traction motor 1022 and the hydraulic motor 1025 are connected to the first and second power input faces respectively. The differential assembly 1026 and the hydraulic pump 1024 are connected to the first and second power output faces respectively. The traction motor 1022 and the hydraulic motor 1025 drive the differential assembly 1026 and the hydraulic pump 1024 respectively through the reduction gearbox 1023. Among them, the first and second power output faces are selected on the left and right sides of the reduction gearbox 1023 (this direction is taken as the reference direction), which are large faces of the reduction gearbox 1023, facilitating the installation of different functional driving components on the reduction gearbox 1023. The first power output face is adjacent to the first and second power input faces. The second power output face is located on the same side of the reduction gearbox 1023 as the second power input face. Specifically, the reduction gearbox 1023 can be selected in different shapes, preferably in a square structure. The first power input face corresponds to the first power output face, and the second power input face corresponds to the second power output face. When the traction motor 1022 is installed on the first power input face, the shaft of the traction motor 1022 is transmitted through the gear inside the reduction gearbox 1023 and transmits the torque to the differential assembly 1026 on the first power output face. When the hydraulic motor 1025 is installed on the second power input face, the shaft of the hydraulic motor 1025 is transmitted through the gear inside the reduction gearbox 1023 and transmits the torque to the hydraulic pump 1024 on the second power output face. Figure 4

[0025] Further, the present application takes Figure 4 and Figure 9 ​It can be seen that the first power input surface and the second power input surface are arranged on the left and right sides of the reduction box 1023 respectively, the first power output surface can be arranged at any end of the reduction box 1023, such as the rear end of the reduction box 1023 of the application, the traction motor 1022 inputs power from the left side of the reduction box 1023, and outputs torque from the differential assembly 1026 on the rear side of the reduction box 1023, the hydraulic motor 1025 and the hydraulic pump 1024 are arranged on the right side wall of the reduction box 1023, and the specific positions can be placed by themselves, thereby shortening the torque transmission distance between the hydraulic motor 1025 and the hydraulic pump 1024 and compressing the overall reduction box 1023 space.

[0026] By distributing the traction motor 1022 and the hydraulic motor 1025 on the left and right sides of the reduction box 1023, and sharing the same reduction box 1023, the compactness of the overall structure is improved, and the traction function and the hydraulic function do not affect each other, which is conducive to the wiring and piping of each component of the machine body, simplifies the electrical connection, and also helps to arrange a larger volume of battery on the vehicle body and improve the overall battery capacity.

[0027] As shown in Figure 2 and Figure 4 , the application comprises a motor controller 1021, which is arranged above the traction motor 1022 and connected to the first power input surface of the reduction box 1023, the motor controller 1021 is installed on the left side of the reduction box 1023, and the position can be selected by itself with the position of the traction motor 1022, in the application, in order to consider the overall weight of the chassis, the traction motor 1022 and the hydraulic motor 1025 are preferably placed at the bottom end of the reduction box 1023, so that the chassis of the vehicle can also bear part of the weight of the traction motor 1022 and the hydraulic motor 1025, the motor controller 1021 is arranged above the traction motor 1022, since the first power input surface only needs to install the traction motor 1022, and the traction motor 1022 is at the bottom end of the reduction box 1023, the motor controller 1021 can be assembled above the traction motor 1022, fully utilizing the space of the first power input surface in the upper half, not only improving the integration of the components, but also shortening the wiring between the motor controller 1021 and the traction motor 1022.

[0028] As shown in Figure 4 , the second power output surface is above the second power input surface, by this scheme, not only can the large size hydraulic motor 1025 be placed at the bottom end of the reduction box 1023, but also the hydraulic pump 1024 can be lifted, which is convenient for connection at the required position of the forklift.

[0029] In the actual product, the traction motor 1022, the hydraulic motor 1025, the motor controller 1021 and the hydraulic pump 1024 are respectively arranged at the edges of the reduction box 1023, and together with the reduction box 1023 form a rectangular shape or a parallelogram shape, wherein the traction motor 1022 is close to the lower left edge of the reduction box 1023, the motor controller 1021 is close to the upper left edge of the reduction box 1023, the hydraulic motor 1025 is close to the lower right edge of the reduction box 1023, and the hydraulic pump 1024 is close to the upper right edge of the reduction box 1023. Preferably, the traction motor 1022 and the hydraulic motor 1025 are flush or close to flush with the bottom surface of the reduction box 1023, and the motor controller 1021 and the hydraulic pump 1024 are flush or close to flush with the top surface of the reduction box 1023, so that each component is supported on the periphery of the reduction box 1023, improving the compactness of the overall structure; the components are flush with the reduction box 1023, so that the entire power system has a rectangular or approximately rectangular shape in front, such as a parallelogram, trapezoidal structure, etc., ensuring that the reduction box 1023 is divided into different functional areas on the left and right sides, which helps to integrate each component on the reduction box 1023, and also facilitates independent maintenance of different functional areas on the left and right sides of the reduction box 1023, shortening the wiring distance between each component.

[0030] As shown in Figures 4-6 , the reduction box 1023 includes a reduction box housing 2370 and a traction reduction unit 2350 and a hydraulic reduction unit 2360 built into the reduction box housing 2370, the traction motor 1022 drives the differential assembly 1026 through the traction reduction unit 2350, and the hydraulic motor 1025 drives the hydraulic pump 1024 through the hydraulic reduction unit 2360. Among them, the traction reduction unit 2350 and the hydraulic reduction unit 2360 are respectively built into the reduction box housing 2370, and are separated in the reduction box housing 2370 to perform different operations.

[0031] As shown in Figure 6 , Figure 7 , Figure 9 and Figure 11As shown, the traction reduction unit 2350 can adopt various gear transmissions, preferably the traction reduction unit 2350 comprises a first shaft gear set, a second shaft gear set and a third shaft gear set which are sequentially and parallel transmitted on the inner wall of the reduction box housing 2370, and the output end of the third shaft gear set drives the differential assembly 1026. The first shaft gear set comprises a first shaft body 2302 and a driving gear 2303, the first shaft body 2302 is rotatably installed on the inner wall of the reduction box housing 2370, and the driving gear 2303 is installed on the outer wall of the first shaft body 2302. The second shaft gear set comprises a second shaft body 2313, a second shaft driven gear 2312 and a second shaft driving gear 2319, the second shaft body 2313 is rotatably connected to the inner wall of the reduction box housing 2370, and the second shaft driven gear 2312 and the second shaft driving gear 2319 are both installed on the outer wall of the second shaft body 2313. The driving gear 2303 is engaged with the second shaft driven gear 2312. The third shaft gear set comprises a third shaft body 2314, a third shaft driven gear 2315 and a third shaft driving gear 2318, the third shaft body 2314 is rotatably connected to the inner wall of the reduction box housing 2370, and the third shaft driven gear 2315 and the third shaft driving gear 2318 are both installed on the outer wall of the third shaft body 2314. The second shaft driving gear 2319 is engaged with the third shaft driven gear 2315. The differential assembly 1026 further comprises a traction gear 2317 rotatably connected to one end of the reduction box housing 2370, and the inner ring of the traction gear 2317 is locked and fixed with the driving differential assembly 1026 by a fastener, for driving the differential assembly 1026 to operate.

[0032] Specifically, the traction motor 1022 is connected with the first shaft body 2302 through the spline shaft 2301, and drives the driving gear 2303 to rotate. The driving gear 2303 is engaged with the second shaft driven gear 2312 to transmit torque. The second shaft driven gear 2312 drives the second shaft driving gear 2319 to rotate through the second shaft body 2313. The second shaft driving gear 2319 is engaged with the third shaft driven gear 2315 to transmit torque through the third shaft driven gear 2315 and the third shaft body 2314 to the third shaft driving gear 2318. The third shaft driving gear 2318 is engaged with the traction gear 2317, and the torsion is output from the differential assembly 1026 to both sides.

[0033] As Figure 6 , Figure 8 and Figure 10As shown in the hydraulic speed reduction unit 2360 includes an input shaft 2310, an output shaft 2305 built-in reduction box shell 2370, one end of the input shaft 2310 connected with the shaft of the hydraulic motor 1025, one end of the output shaft 2305 connected with the shaft of the hydraulic motor 1025, the outer wall of the input shaft 2310 and the output shaft 2305 are provided with the input gear 2311 and the output gear 2304 transmission, the hydraulic motor 1025 start, it drives the input shaft 2310 and the input gear 2311 rotation, the input gear 2311 can be directly with the output gear 2304 meshing, thereby driving the output shaft 2305 and the shaft of the hydraulic pump 1024 rotation, of course, the input gear 2311 and the output gear 2304 can also use one or more intermediate gear transmission, specifically: As shown in the hydraulic speed reduction unit 2360 includes an input shaft 2310, an output shaft 2305 built-in reduction box shell 2370, one end of the input shaft 2310 connected with the shaft of the hydraulic motor 1025, one end of the output shaft 2305 connected with the shaft of the hydraulic motor 1025, the outer wall of the input shaft 2310 and the output shaft 2305 are provided with the input gear 2311 and the output gear 2304 transmission, the hydraulic motor 1025 start, it drives the input shaft 2310 and the input gear 2311 rotation, the input gear 2311 can be directly with the output gear 2304 meshing, thereby driving the output shaft 2305 and the shaft of the hydraulic pump 1024 rotation, of course, the input gear 2311 and the output gear 2304 can also use one or more intermediate gear transmission, specifically: Figure 8 As shown in the hydraulic speed reduction unit 2360 includes an input shaft 2310, an output shaft 2305 built-in reduction box shell 2370, one end of the input shaft 2310 connected with the shaft of the hydraulic motor 1025, one end of the output shaft 2305 connected with the shaft of the hydraulic motor 1025, the outer wall of the input shaft 2310 and the output shaft 2305 are provided with the input gear 2311 and the output gear 2304 transmission, the hydraulic motor 1025 start, it drives the input shaft 2310 and the input gear 2311 rotation, the input gear 2311 can be directly with the output gear 2304 meshing, thereby driving the output shaft 2305 and the shaft of the hydraulic pump 1024 rotation, of course, the input gear 2311 and the output gear 2304 can also use one or more intermediate gear transmission, specifically:

[0034] As shown in the hydraulic speed reduction unit 2360 includes an input shaft 2310, an output shaft 2305 built-in reduction box shell 2370, one end of the input shaft 2310 connected with the shaft of the hydraulic motor 1025, one end of the output shaft 2305 connected with the shaft of the hydraulic motor 1025, the outer wall of the input shaft 2310 and the output shaft 2305 are provided with the input gear 2311 and the output gear 2304 transmission, the hydraulic motor 1025 start, it drives the input shaft 2310 and the input gear 2311 rotation, the input gear 2311 can be directly with the output gear 2304 meshing, thereby driving the output shaft 2305 and the shaft of the hydraulic pump 1024 rotation, of course, the input gear 2311 and the output gear 2304 can also use one or more intermediate gear transmission, specifically: Figures 9-14As shown, the traction motor 1022 and the hydraulic motor 1025 are both at the bottom end of the reduction gearbox 1023, the traction reduction unit 2350 is arranged upward from the traction motor 1022 along the edge of the reduction gearbox 1023, and the hydraulic reduction unit 2360 is arranged upward from the hydraulic motor 1025 along the edge of the reduction gearbox 1023; this design can not only lower the overall center of gravity and improve stability, but also realize the transmission chain of the hydraulic reduction unit 2360 arranged upward at the edge, while realizing the installation of the traction motor 1022 and the hydraulic motor 1025 at the bottom, the longitudinal and lateral dimensions of the reduction gearbox 1023 are compressed to the maximum extent, which is a refinement of the core space layout plan. To further improve space utilization on the left and right sides of the reduction gearbox 1023, the first, second, and third shaft gear sets are sequentially connected in a transmission manner. The input end of the first shaft gear set is connected to the output end of the traction motor 1022. The second and third shaft gear sets are sequentially arranged upward along the edge of the reduction gearbox housing 2370 in a triangular pattern, achieving staggered meshing of the first, second, and third shaft gear sets, further reducing the size of the reduction gearbox housing 2370. Similarly, the input gear 2311, idler gear 2306, and output gear 2304 of the hydraulic reduction unit 2360 are arranged in a similar manner. This arrangement allows the traction reduction unit 2350 and the hydraulic reduction unit 2360 to adopt a similar gear distribution structure, improving the symmetry of the reduction gearbox housing 2370. This not only saves space utilization by preventing the reduction gearbox housing 2370 from interfering with the space due to its irregular shape, but also enhances the structural strength of the reduction gearbox housing 2370 between the traction reduction unit 2350 and the hydraulic reduction unit 2360.

[0035] like Figure 14 As shown, the arrow in the figure represents the oil height inside the reduction box 1023. The oil in the reduction box 1023 can pass through the traction reduction unit 2350 and the hydraulic reduction unit 2360, so that the oil of the two can be shared. This not only saves the cost of independently designed oil lubrication, but also saves the overall space of the reduction box 1023, making the overall space more compact.

[0036] like Figures 2-5As shown, the application provides an electric forklift, which is provided with the above-mentioned compact power system, i.e., the integrated power system 102, and the compact power system is provided with the reduction gearbox flange face 1027. The electric forklift comprises two drive axles 101, and at least one drive axle 101 is provided with a toothed flange face 1014, a drive axle left half shaft 1012 and a drive axle right half shaft 1013. The reduction gearbox flange face 1027 is installed on the toothed flange face 1014, and the drive axle left half shaft 1012 and the drive axle right half shaft 1013 are both installed on the differential assembly 1026. Preferably, the electric forklift adopts a single integrated power system 102 as a power source, such as a front-drive or rear-drive electric forklift. The application preferably adopts a front-drive electric forklift. When the toothed flange face 1014 and the reduction gearbox flange face 1027 are installed, the traction motor 1022 drives the differential assembly 1026 to rotate through the reduction gearbox 1023, and the differential assembly 1026 drives the drive axle left half shaft 1012 and the drive axle right half shaft 1013 to rotate, thereby realizing the traction function of the electric forklift.

[0037] As shown in Figure 2 and Figure 4 The electric forklift comprises a battery pack 104, which is installed between the two drive axles 101. When the traction motor 1022, the hydraulic motor 1025, the differential assembly 1026, the hydraulic pump 1024 and the motor controller 1021 are all integrated around the reduction gearbox 1023, more space is reserved for the chassis of the electric forklift, and the battery pack 104 can occupy the space originally occupied by the hydraulic motor 1025, the hydraulic pump 1024 and the motor controller 1021, thereby greatly improving the battery capacity of the battery pack 104 and the endurance of the whole electric forklift.

[0038] The above-mentioned preferred embodiments of the application do not limit the patent scope of the application, and any equivalent structural transformation, direct / indirect application in other related technical fields or the like made according to the application description and the drawings within the inventive concept of the application are included in the patent protection scope of the application.

Claims

1. A compact power system, characterized in that: include: The reduction box (1023) has a first power input surface and a second power input surface opposite to each other, and also has a first power output surface and a second power output surface; A traction motor (1022) and a hydraulic motor (1025) are connected to the first power input surface and the second power input surface respectively; A differential assembly (1026) and a hydraulic pump (1024) are connected to the first power output surface and the second power output surface respectively; The first power output surface is adjacent to the first power input surface and the second power input surface; the second power output surface and the second power input surface are located on the same side of the reduction gearbox (1023); the traction motor (1022) and the hydraulic motor (1025) respectively drive the differential assembly (1026) and the hydraulic pump (1024) through the reduction gearbox (1023).

2. The compact power system according to claim 1, characterized in that: The motor controller (1021) is configured above the traction motor (1022) and connected to the first power input surface of the reduction box (1023).

3. The compact power system according to claim 2, characterized in that: The traction motor (1022), the hydraulic motor (1025), the motor controller (1021), and the hydraulic pump (1024) are respectively placed on the edges of the reduction box (1023), and together with the reduction box (1023) form a rectangular shape or a parallelogram shape.

4. The compact power system according to claim 2 or 3, characterized in that: The second power output surface is located above the second power input surface.

5. The compact power system according to claim 1, wherein: The reduction gearbox (1023) includes a reduction gearbox housing (2370) and a traction reduction unit (2350) and a hydraulic reduction unit (2360) built into the reduction gearbox housing (2370); the traction motor (1022) drives the differential assembly (1026) via the traction reduction unit (2350); and the hydraulic motor (1025) drives the hydraulic pump (1024) via the hydraulic reduction unit (2360).

6. The compact power system according to claim 5, characterized in that: The traction reduction unit (2350) includes a single-axis gear set, a double-axis gear set, and a three-axis gear set which are sequentially driven in parallel on the inner wall of the reduction gearbox housing (2370), and the output end of the three-axis gear set drives the differential assembly (1026).

7. The compact power system according to claim 5, characterized in that: The hydraulic reduction unit (2360) includes an input shaft (2310) and an output shaft (2305) built into the reduction box housing (2370), one end of the input shaft (2310) is connected to the output end of the hydraulic motor (1025), and one end of the output shaft (2305) is connected to the input end of the hydraulic motor (1025), and the outer walls of the input shaft (2310) and the output shaft (2305) are respectively provided with an input gear (2311) and an output gear (2304) that transmit transmission to each other.

8. The compact power system according to claim 7, wherein: The hydraulic reduction unit (2360) includes an intermediate shaft (2307) and an idler wheel (2306) built into the reduction box housing (2370), the idler wheel (2306) is mounted on the outer wall of the intermediate shaft (2307), and the input gear (2311) and the output gear (2304) are both engaged with the idler wheel (2306).

9. The compact power system according to claim 5, wherein: The traction motor (1022) and the hydraulic motor (1025) are both located at the bottom end of the reduction box (1023); the traction reduction unit (2350) is arranged upward from the traction motor (1022) along the edge of the reduction box (1023); and the hydraulic reduction unit (2360) is arranged upward from the hydraulic motor (1025) along the edge of the reduction box (1023).

10. An electric forklift, characterized in that: A compact power system according to any one of claims 1 to 9 is installed, the compact power system having a reduction gearbox flange surface (1027), the electric forklift comprising two drive axles (101), at least one of the drive axles (101) having a toothed flange surface (1014), a left drive axle half shaft (1012) and a right drive axle half shaft (1013), the toothed flange surface (1014) being installed on the reduction gearbox flange surface (1027), and the left drive axle half shaft (1012) and the right drive axle half shaft (1013) being installed on the differential assembly (1026).

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