A compact power system and an electric fork truck

Abstract

The application discloses a compact power system and an electric forklift, and relates to the technical field of industrial vehicles. Specifically, the compact power system comprises a reduction gearbox, a traction motor, a hydraulic motor, a differential assembly and a hydraulic pump. The reduction gearbox is provided with opposite first and second power input surfaces and first and second power output surfaces. The traction motor and the hydraulic motor are connected to the first and second power input surfaces respectively. The differential assembly and the hydraulic pump are connected to the first and second power output surfaces respectively. The first power output surfaces are adjacent to the first and second power input surfaces. The second power output surface and the second power input surface are located on the same side of the reduction gearbox. The components are closely attached to the periphery of the reduction gearbox, which not only improves the compactness of the overall structure, but also simplifies the electrical connection. When the power system is installed on the chassis of the vehicle body, more space is reserved on the chassis to accommodate the battery.

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, limiting the size of the battery pack, so that it cannot 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:

[0008] The reduction box has opposite first and second power input faces, and also has first and second power output faces;

[0009] The traction motor and the hydraulic motor are connected to the first and second power input faces, respectively;

[0010] The differential assembly and the hydraulic pump are connected to the first and second power output faces, respectively;

[0011] ​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.

[0012] 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.

[0013] 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.

[0014] Further, the second power output surface is above the second power input surface.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] The application also discloses an electric forklift provided with the compact power system.

[0021] The above technical scheme has the following advantages:

[0022] 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.

[0023] 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

[0024] The application will be described in detail below with reference to specific embodiments and drawings, in which:

[0025] Figure 1 The figure is a structural schematic diagram of the prior art of the application;

[0026] Figure 2 The figure is a structural layout schematic diagram of the application;

[0027] Figure 3 The figure is a first perspective view of the application cooperating with the drive axle;

[0028] Figure 4 The figure is a second perspective view of the application cooperating with the drive axle;

[0029] Figure 5 The figure is an exploded structural view of the application cooperating with the drive axle;

[0030] Figure 6 The figure is a transmission schematic diagram of the reduction gearbox of the application;

[0031] Figure 7 The figure is a transmission schematic diagram of the traction reduction unit of the application;

[0032] Figure 8 The figure is a transmission schematic diagram of the hydraulic reduction unit of the application;

[0033] Figure 9 Structure diagram of the traction reduction unit of the present application;

[0034] Figure 10 Structure diagram of the hydraulic reduction unit of the present application;

[0035] Figure 11 Forward structure diagram of the traction reduction unit of the present application;

[0036] Figure 12 Forward structure diagram of the hydraulic reduction unit of the present application;

[0037] Figure 13 Structure diagram of the differential assembly removal of the present application;

[0038] Figure 14 Forward structure diagram of the differential assembly removal of the present application.

[0039] In the figure:

[0040] 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

[0041] In order to make the purpose, technical scheme and advantages of the present application clearer, the present 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 present application and do not constitute a limitation on the present application.

[0042] 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 to realize 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 to participate in the lifting function of the forks, the battery pack 104 is installed in the middle area of the chassis and also occupies an independent area of the chassis to play a power supply role for the forklift, and the motor controller 1021 is installed side by side at the rear of the chassis of the forklift to play a role in adjusting the hydraulic motor 1025 and the traction motor 1022.

[0043] In the above scheme, there are many technical problems: 1) the arrangement of each unit is dispersed, and additional mounting points need to be increased; 2) each unit has a large volume and occupies a lot of space in the vehicle; 3) the electrical connection between each unit is complex, the wire harness is long and complex, 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, and a large-capacity battery cannot be installed, so the running time of the vehicle is short.

[0044] 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 includes a reduction box 1023, a traction motor 1022, a hydraulic motor 1025, a differential assembly 1026 and a hydraulic pump 1024. The reduction box 1023 has opposite first and second power input faces and first and second power output faces. The traction motor 1022 and the hydraulic motor 1025 are respectively connected to the first and second power input faces. The differential assembly 1026 and the hydraulic pump 1024 are respectively connected to the first and second power output faces. The traction motor 1022 and the hydraulic motor 1025 are respectively driven by the reduction box 1023 to drive the differential assembly 1026 and the hydraulic pump 1024, respectively. The first and second power output faces are selected as the left and right faces of the reduction box 1023 (the direction is determined by the driving direction of the forklift), and the first and second power input faces are selected as the front and rear faces of the reduction box 1023 (the direction is determined by the driving direction of the forklift). Figure 4As a reference benchmark), also the large surface of the reduction box 1023, it is convenient to install different functional driving components on the reduction box 1023, 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 located on the same side of the reduction box 1023 as the second power input surface. Specifically, the reduction box 1023 can be selected in different shapes, preferably in an approximate square structure, the first power input surface and the first power output surface correspond to each other, and the second power input surface and the second power output surface correspond to each other, when the traction motor 1022 is installed on the first power input surface, the shaft body of the traction motor 1022 is transmitted through the gear inside the reduction box 1023, and the torque is transmitted to the differential assembly 1026 of the first power output surface; when the hydraulic motor 1025 is installed on the second power input surface, the shaft body of the hydraulic motor 1025 is transmitted through the gear inside the reduction box 1023, and the torque is transmitted to the hydraulic pump 1024 of the second power output surface.

[0045] Further, the present application is Figure 4 and Figure 9 It can be seen that the first power input surface and the second power input surface are respectively arranged on the left and right sides of the reduction box 1023, and 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 present 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 their specific positions can be placed by themselves, which shortens the torque transmission distance between the hydraulic motor 1025 and the hydraulic pump 1024, and compresses the overall reduction box 1023 space.

[0046] 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 beneficial to the wiring and piping of each component, simplifies the electrical connection, and also helps to arrange larger volume batteries on the vehicle body, and improves the overall battery capacity.

[0047] As Figure 2 and Figure 4As shown, the application includes a motor controller 1021, which is configured 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 surface of the reduction box 1023, and its position can be selected independently of 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, making full use of the space in the upper half of the first power input surface, not only improving the integration of components, but also shortening the wiring distance between the motor controller 1021 and the traction motor 1022.

[0048] As shown, Figure 4 The second power output surface is located above the second power input surface. Through 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 to facilitate connection at the required position of the forklift.

[0049] 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 form a rectangular shape or a parallelogram shape together with the reduction box 1023. Among them, 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 flush arrangement of each component with the reduction box 1023 makes the entire power system present a rectangular or approximately rectangular shape in front, such as a parallelogram or trapezoidal structure, ensuring that the left and right sides of the reduction box 1023 are divided into different functional areas, 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.

[0050] As shown, Figures 4-6As shown, the reduction gearbox 1023 comprises a reduction gearbox housing 2370 and a traction reduction unit 2350 and a hydraulic reduction unit 2360 built in the reduction gearbox 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. Wherein, the traction reduction unit 2350 and the hydraulic reduction unit 2360 are respectively built in the reduction gearbox housing 2370, and are separated in the reduction gearbox housing 2370 to perform different operations.

[0051] As shown in Figure 6 , Figure 7 , Figure 9 and Figure 11 , the traction reduction unit 2350 can adopt various gear transmissions, and preferably the traction reduction unit 2350 comprises a one-axis gear set, a two-axis gear set and a three-axis gear set which are sequentially and parallel transmitted 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. Wherein, the one-axis gear set comprises a first shaft body 2302, a driving gear 2303, the first shaft body 2302 is rotatably installed on the inner wall of the reduction gearbox housing 2370, and the driving gear 2303 is installed on the outer wall of the first shaft body 2302, the two-axis gear set comprises a second shaft body 2313, a two-axis driven gear 2312 and a two-axis driving gear 2319, the second shaft body 2313 is rotatably connected to the inner wall of the reduction gearbox housing 2370, the two-axis driven gear 2312 and the two-axis driving gear 2319 are both installed on the outer wall of the second shaft body 2313, the driving gear 2303 is engaged with the two-axis driven gear 2312, the three-axis gear set comprises a third shaft body 2314, a three-axis driven gear 2315 and a three-axis driving gear 2318, the third shaft body 2314 is rotatably connected to the inner wall of the reduction gearbox housing 2370, the three-axis driven gear 2315 and the three-axis driving gear 2318 are both installed on the outer wall of the third shaft body 2314, and the two-axis driving gear 2319 is engaged with the three-axis driven gear 2315; the differential assembly 1026 further comprises a traction gear 2317 rotatably connected to one end of the reduction gearbox housing 2370, the inner ring of the traction gear 2317 is locked and fixed with the driving differential assembly 1026 through fasteners, for driving the differential assembly 1026 to operate.

[0052] 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 two-axis driven gear 2312 to transmit torque, the two-axis driven gear 2312 drives the two-axis driving gear 2319 to rotate through the second shaft body 2313, the two-axis driving gear 2319 is engaged with the three-axis driven gear 2315 to transmit torque through the three-axis driven gear 2315, the third shaft body 2314 and the three-axis driving gear 2318, the three-axis driving gear 2318 is engaged with the traction gear 2317, and the torque is output to both sides from the differential assembly 1026.

[0053] As shown in Figure 6 , Figure 8 and Figure 10 , the hydraulic speed reduction unit 2360 includes an input shaft 2310 and an output shaft 2305 built in the speed reduction box shell 2370, one end of the input shaft 2310 is connected with the shaft body of the hydraulic motor 1025, one end of the output shaft 2305 is connected with the shaft body of the hydraulic motor 1025, the outer walls of the input shaft 2310 and the output shaft 2305 are respectively provided with the input gear 2311 and the output gear 2304 which transmit to each other, the hydraulic motor 1025 is started, which drives the input shaft 2310 and the input gear 2311 to rotate, the input gear 2311 can be directly engaged with the output gear 2304, thereby driving the output shaft 2305 and the shaft body of the hydraulic pump 1024 to rotate, of course, one or more intermediate gears can also be used between the input gear 2311 and the output gear 2304, specifically:

[0054] As shown in Figure 8 , the hydraulic speed reduction unit 2360 includes an intermediate shaft 2307 and an idler gear 2306 built in the speed reduction box shell 2370, the idler gear 2306 is installed on the outer wall of the intermediate shaft 2307, the intermediate shaft 2307 is rotatably connected to the inner wall of the speed reduction box shell 2370, and the input gear 2311 and the output gear 2304 are engaged with the idler gear 2306. Among them, the input gear 2311 is engaged with the idler gear 2306, the hydraulic motor 1025 drives the idler gear 2306 to rotate through the input shaft 2310 and the input gear 2311, the idler gear 2306 is engaged with the output gear 2304, the rotating idler gear 2306 drives the output gear 2304 to rotate, so that the output shaft 2305 drives the shaft body of the hydraulic pump 1024 to rotate, realizing the work of the hydraulic motor 1025 driving the hydraulic pump 1024. The addition of the intermediate shaft 2307 and the idler gear 2306 can make up for the structural interference between the hydraulic motor 1025 and the hydraulic pump 1024, thereby lengthening the transmission distance. At the same time, the traction speed reduction unit 2350 and the hydraulic speed reduction unit 2360 both adopt the three-gear transmission mode, so that the left and right sides of the speed reduction box shell 2370 are symmetrically arranged, the traction and hydraulic functions are integrated on the left and right sides of the speed reduction box shell 2370, and independent work is realized.

[0055] As Figures 9-14 shown, the traction motor 1022 and the hydraulic motor 1025 are both at the bottom end of the reduction box 1023, the traction reduction unit 2350 is arranged upward along the edge of the reduction box 1023 from the traction motor 1022, and the hydraulic reduction unit 2360 is arranged upward along the edge of the reduction box 1023 from the hydraulic motor 1025; this design not only reduces the overall center of gravity and improves stability, but also realizes the transmission chain of the upward edge arrangement of the hydraulic reduction unit 2360, maximizes the compression of the longitudinal and transverse dimensions of the reduction box 1023 while realizing the bottom installation of the traction motor 1022 and the hydraulic motor 1025, which is a refinement of the core space layout scheme. In order to further improve the space utilization rate of the left and right sides of the reduction box 1023, the one-axis gear set, the two-axis gear set and the three-axis gear set are sequentially connected in transmission, and the input end of the one-axis gear set is connected with the output end of the traction motor 1022, the two-axis gear set and the three-axis gear set are sequentially distributed upward along the edge of the reduction box shell 2370 in a triangular distribution, realizing the staggered meshing of the one-axis gear set, the two-axis gear set and the three-axis gear set, and further compressing the size of the reduction box shell 2370. Similarly, the distribution mode of the input gear 2311, the idler gear 2306 and the output gear 2304 in the hydraulic reduction unit 2360 is the same. Through this distribution mode, the traction reduction unit 2350 and the hydraulic reduction unit 2360 adopt an approximate gear distribution structure, which improves the symmetry of the reduction box shell 2370, not only saving space utilization to avoid interference space due to the special shape of the reduction box shell 2370, but also enhancing the structural strength of the reduction box shell 2370 located in the traction reduction unit 2350 and the hydraulic reduction unit 2360.

[0056] As Figure 14 shown, the arrows of this figure are the oil level inside the reduction box 1023, and the oil in the reduction box 1023 can pass through the traction reduction unit 2350 and the hydraulic reduction unit 2360 to realize the oil sharing of the two, not only saving the cost of independent design of oil lubrication, but also saving the overall space of the reduction box 1023, making the overall space more compact.

[0057] As 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.

[0058] 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.

[0059] The above-mentioned preferred embodiments of the application are not intended to limit the patent scope of the application. Any equivalent structural transformation based on the application concept, the content of the specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A compact power system characterized by, The application relates to a reduction gearbox (1023) with opposite first and second power input faces and first and second power output faces. A traction motor (1022) and a hydraulic motor (1025) are connected to the first and second power input faces respectively. A differential assembly (1026) and a hydraulic pump (1024) are connected to the first and second power output faces respectively. The first power output face is adjacent to the first and second power input faces, and the second power output face is on the same side of the second power input face in the reduction gearbox (1023). The reduction gearbox (1023) comprises a reduction gearbox shell (2370) and a traction reduction unit (2350) and a hydraulic reduction unit (2360) arranged in the reduction gearbox shell (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). A motor controller (1021) is arranged above the traction motor (1022) and connected to the first power input face of the reduction gearbox (1023), and the second power output face is above the second power input face. The traction reduction unit (2350) and the hydraulic reduction unit (2360) adopt a three-gear transmission mode, and the left and right sides of the reduction gearbox shell (2370) are symmetrically arranged. The oil in the reduction gearbox (1023) can pass through the traction reduction unit (2350) and the hydraulic reduction unit (2360), and the oil in the two units is shared. The traction motor (1022), the hydraulic motor (1025), the motor controller (1021) and the hydraulic pump (1024) are arranged at the edges of the reduction gearbox (1023) and form a rectangle or a parallelogram together with the reduction gearbox (1023).

2. The compact power system of claim 1, wherein, The traction reduction unit (2350) comprises a shaft gear set, a two-shaft gear set and a three-shaft gear set which are arranged in parallel in the inner wall of the reduction gearbox shell (2370) in sequence, and the output end of the three-shaft gear set drives the differential assembly (1026).

3. The compact power system of claim 1, wherein, The hydraulic reduction unit (2360) comprises an input shaft (2310) and an output shaft (2305) arranged in the reduction gearbox shell (2370), one end of the input shaft (2310) is connected to the output end of the hydraulic motor (1025), 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) which drive each other.

4. The compact power system of claim 1, wherein, ​ 5. The compact power system of claim 4, wherein, The hydraulic reduction unit (2360) comprises an intermediate shaft (2307) and an idler (2306) built in the reduction box shell (2370), the idler (2306) is installed on the outer wall of the intermediate shaft (2307), the input gear (2311) and the output gear (2304) are engaged with the idler (2306).

6. The compact power system of claim 1, wherein, The traction motor (1022) and the hydraulic motor (1025) are both 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).

7. An electric fork truck characterized by The electric forklift comprises two drive axles (101), at least one of the drive axles (101) is provided with a toothed flange (1014), a drive axle left half shaft (1012) and a drive axle right half shaft (1013), the toothed flange (1014) is installed on the reduction box flange (1027), and the drive axle left half shaft (1012) and the drive axle right half shaft (1013) are both installed on the differential assembly (1026).

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