Electric drive system assembly for a forklift truck

Abstract

This invention discloses an electric drive system assembly for forklifts, aiming to solve the problems of excessively long cabling, complex cooling systems, and difficult braking system layout caused by the distributed arrangement of existing electric drive systems for forklifts. It includes a parallel arrangement where the hydraulic drive motor and the travel drive motor are placed on the same side of the travel and hydraulic reducers, reducing intermediate torque transmission components and rationally utilizing the space on one side of the travel and hydraulic reducers. This successfully achieves the placement of the hydraulic drive motor and travel drive motor within the space of only one side of the travel and hydraulic reducers; it also allows the electromagnetic brake and hydraulic pump to be located on the other side of the travel and hydraulic reducers, reducing the overall length of the cabling and the space occupied by the cooling system. The integrated arrangement facilitates easy assembly and disassembly; it also facilitates the braking function of the electromagnetic brake and the power take-off of the hydraulic pump.

Description

Technical Field

[0001] This invention relates to an electric drive system assembly for forklifts, belonging to the field of electric forklifts. Background Technology

[0002] With the continuous development of the economy, higher requirements are being placed on the transmission, drive, and braking systems of electric forklifts and their layout in the vehicle. Current electric forklifts have a limited range of technical approaches for their walking and hydraulic drive subsystems and their overall vehicle layout, primarily using a drive motor and a front axle reduction gearbox to form the walking drive system unit.

[0003] However, the forklift's entire drive system is arranged in a widely distributed manner. For example, the travel drive system unit is located at the front axle, the hydraulic drive unit is located in the middle and rear of the vehicle, and the motor control unit is located in the middle and rear of the vehicle. This results in the travel drive subsystem unit and the hydraulic drive subsystem unit being far from the motor controller unit, leading to excessively long connecting cables. Ultimately, this results in a messy wiring harness, high cable costs, and low energy efficiency, ultimately increasing the overall cost and energy consumption of the vehicle. In addition, with the travel and hydraulic drive subsystems arranged so widely, heat dissipation is difficult to achieve and inefficient, requiring individual cooling for each unit. This makes the entire system extremely complex and significantly increases the cost of the prototype. Furthermore, the conventional electric forklift braking system is located at the front axle wheel end, requiring a large braking torque, which places higher demands on the size and reliability of the braking system.

[0004] In summary, existing electric drive systems for forklifts suffer from problems such as excessively long cabling, complex cooling systems, and difficulties in arranging braking systems due to their distributed layout. Summary of the Invention

[0005] The purpose of this application is to overcome the shortcomings of the prior art and provide an electric drive system assembly for forklifts that features integrated layout, reduced overall vehicle cable length, simplified heat dissipation, and easy installation of the braking system.

[0006] To achieve the above objectives, this application employs the following technical solution: This application provides an electric drive system assembly for forklifts, comprising, A travel and hydraulic reducer is provided, with a hydraulic drive motor and a travel drive motor arranged in parallel on the same side of the travel and hydraulic reducer. The hydraulic drive motor and the travel drive motor are respectively connected to the travel and hydraulic reducer for torque transmission. An electromagnetic brake and a hydraulic oil pump are located on the side of the travel and hydraulic reducer away from the hydraulic drive motor and the travel drive motor. The electromagnetic brake brakes the first-stage drive gear of the travel and hydraulic reducer, and the hydraulic oil pump is connected to the travel and hydraulic reducer for transmission.

[0007] In some embodiments of this application, a walking and hydraulic motor controller is also included; the walking and hydraulic motor controller is electrically connected to the hydraulic drive motor and the walking drive motor respectively, and the walking and hydraulic motor controller is fixed on the same side of the hydraulic drive motor and the walking drive motor.

[0008] In some embodiments of this application, the walking and hydraulic reducer is provided with a partition wall, which is used to isolate the walking reduction gear set and the hydraulic reduction gear set.

[0009] In some embodiments of this application, the second housing of the electromagnetic brake is fixedly connected to the first housing of the walking and hydraulic reducer.

[0010] In some embodiments of this application, the sixth external spline of the walking drive motor is torsionally connected to the first internal spline of the first-stage drive gear of the walking and hydraulic reducer; the first internal spline is also torsionally connected to the second internal spline of the electromagnetic brake, and the second internal spline is connected to the friction plate assembly; the electromagnetic brake further includes an adjustable armature, which is used to press the friction plate assembly to brake the first-stage drive gear of the walking and hydraulic reducer.

[0011] In some embodiments of this application, the friction plate group includes an alternating outer friction plate group and an inner friction plate group, and the adjustable armature is used to drive the outer friction plate group and the inner friction plate group to press against each other to achieve the braking effect of the first-stage drive gear of the walking and hydraulic reducer.

[0012] In some embodiments of this application, the outer friction plate group is fixedly connected to the inner wall of the second housing, and the inner friction plate group is fixedly connected to the second inner spline via a magnetic yoke; when the adjustable armature does not drive the outer friction plate group and the inner friction plate group to press against each other, the inner friction plate group can rotate relative to the outer friction plate group; when the adjustable armature drives the outer friction plate group and the inner friction plate group to press against each other, the outer friction plate group resists the relative rotation of the inner friction plate group through friction.

[0013] In some embodiments of this application, the magnetic yoke is connected to the outside of the second internal spline, the internal friction plate group is disposed on the outside of the magnetic yoke, and the magnetic yoke is disposed inside the second outer shell.

[0014] In some embodiments of this application, the electromagnetic brake further includes a coil and an elastic reset member disposed in the openings respectively preset in the magnetic yoke, wherein the coil and the reset spring are arranged in the same direction along the second inner spline; When the coil is energized, it can attract the adjustable armature to move, so that the adjustable armature drives the outer friction plate group and the inner friction plate group to press against each other; when the coil is de-energized, the elastic reset member is used to drive the adjustable armature to return to its original position.

[0015] In some embodiments of this application, a slip ring is provided on the side of the magnetic yoke away from the second internal spline. The slip ring is used to reduce the frictional force on the magnetic yoke from the inner wall of the second housing. The slip ring is located on the side of the friction plate assembly away from the adjustable armature.

[0016] Compared with the prior art, the beneficial effects achieved by this application are as follows: The electric drive system assembly for forklifts provided in this application arranges the hydraulic drive motor and the travel drive motor in a parallel configuration on the same side of the travel and hydraulic reducer. The hydraulic drive motor and the travel drive motor are directly connected to the travel and hydraulic reducer for torque transmission, reducing intermediate torque transmission components. Furthermore, the arrangement follows the shape characteristics of the hydraulic drive motor and the travel drive motor, making rational use of the space on one side of the travel and hydraulic reducer. This successfully achieves the goal of accommodating the hydraulic drive motor and the travel drive motor in only one side of the travel and hydraulic reducer. Based on this, it is possible to place the electromagnetic brake and the hydraulic oil pump on the other side of the travel and hydraulic reducer, realizing a unified electric drive system assembly. This reduces the overall length of the vehicle's cabling and the space occupied by the cooling system. The integrated arrangement facilitates easy assembly and disassembly. It also facilitates the electromagnetic brake's braking function and the hydraulic oil pump's power take-off, reducing the number of intermediate transmission components. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the electric drive system assembly for forklifts provided in this embodiment; Figure 2 yes Figure 1 A structural diagram from another perspective; Figure 3 for Figure 1 A schematic diagram of the transmission between the travel and hydraulic reducer, the hydraulic drive motor, and the travel drive motor; Figure 4 yes Figure 1 A cross-sectional view of the electromagnetic brake taken along the central axis of the second internal spline; Figure 5 Is Figure 1 The layout of the walking and hydraulic motor controllers is shown on the basis, while other components are blurred. Figure 6 Is Figure 1 A schematic diagram showing the layout of the walking mechanism and hydraulic reducer, with other components blurred; Figure 7 Is Figure 1 A schematic diagram showing the layout of the electromagnetic brake and blurring other components is provided. Figure 8 Is Figure 1 The diagram shows the layout of the hydraulic pump and blurs other components. Figure 9 Is Figure 1 The diagram shows the layout of the hydraulic drive motor and blurs other components. Figure 10 Is Figure 1 A schematic diagram showing the layout of the walking drive motor and blurring other components is displayed on the basis. In the diagram: 1. Traveling and hydraulic reducer; 101. First-stage drive gear of the traveling and hydraulic reducer; 10101. First internal spline; 10102. First external spline; 102. First housing; 103. Partition wall; 104. Traveling reduction gear set; 105. Hydraulic reduction gear set; 2. Electromagnetic brake; 201. Second housing; 202. Adjustable armature; 202. Second internal spline; 203. Friction plate assembly; 204. Slip ring; 205. Coil; 206. Magnetic yoke; 207. Elastic reset element; 3. Hydraulic oil pump; 4. Walking and hydraulic motor controller; 5. Hydraulic drive motor; 6. Walking drive motor; 601. Sixth external spline. Detailed Implementation

[0019] The technical solutions of this application / the embodiments thereof will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application / the embodiments thereof, and not all embodiments thereof. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application / the application thereof or its application or use. Example 1

[0020] This embodiment provides an electric drive system assembly for forklifts to solve the problems in the prior art where the distributed layout of electric drive systems for forklifts leads to excessively long vehicle cables, complex cooling systems, and difficulties in arranging braking systems.

[0021] refer to Figures 1 to 4 The electric drive system assembly for forklifts provided in this embodiment includes a travel and hydraulic reducer 1, a hydraulic drive motor 5 and a travel drive motor 6 arranged in parallel on the same side of the travel and hydraulic reducer 1, and the hydraulic drive motor 5 and the travel drive motor 6 respectively connected to the travel and hydraulic reducer 1 for torque transmission; an electromagnetic brake 2 and a hydraulic oil pump 3 are located on the side of the travel and hydraulic reducer 1 away from the hydraulic drive motor 5 and the travel drive motor 6; the electromagnetic brake 2 brakes the first-stage drive gear 101 of the travel and hydraulic reducer 1, which can significantly improve braking efficiency; the hydraulic oil pump 3 is connected to the travel and hydraulic reducer 1 for transmission, which facilitates the hydraulic oil pump 3 to take power from the travel and hydraulic reducer 1, reduces the space occupied by intermediate power take-off components or saves the cost of pumping power source devices.

[0022] Electric forklifts rely entirely on hydraulic cylinders for operation and steering, requiring significant hydraulic system pressure. This necessitates a large torque from the hydraulic pump motor. Directly driving the pump motor results in lower motor speeds and higher costs. In this embodiment, the hydraulic pump 3 draws power from the travel mechanism and hydraulic reducer 1, overcoming this problem.

[0023] The electric drive system assembly for forklifts provided in this embodiment arranges the hydraulic drive motor 5 and the travel drive motor 6 on the same side of the travel and hydraulic reducer 1 in a parallel manner. The hydraulic drive motor 5 and the travel drive motor 6 are directly connected to the travel and hydraulic reducer 1 for torque transmission, reducing intermediate torque transmission components. At the same time, the arrangement follows the shape characteristics of the hydraulic drive motor 5 and the travel drive motor 6, making rational use of the space on one side of the travel and hydraulic reducer 1. It successfully achieves the goal of accommodating the hydraulic drive motor 5 and the travel drive motor 6 in the space occupied by only one side of the travel and hydraulic reducer 1. Based on this, it is possible to place the electromagnetic brake 2 and the hydraulic oil pump 3 on the other side of the travel and hydraulic reducer 1, realizing the integrated setup of the electric drive system, reducing the overall length of the vehicle's cables, and also reducing the space occupied by the heat dissipation system. The integrated layout facilitates integrated assembly and disassembly. This also facilitates the electromagnetic brake 2 to perform its braking function and the hydraulic oil pump 3 to take power, reducing the number of intermediate transmission components.

[0024] In existing technologies, electric drive assembly braking systems still follow the technical approach of placing the braking system at the wheel end, similar to that of fuel-powered vehicles. This requires a large braking torque from the brakes, resulting in large size, high cost, and low reliability. However, the electric drive system assembly for forklifts provided in this embodiment is specifically designed to adapt to the motor, overcoming this problem. Example 2

[0025] This embodiment provides an electric drive system assembly for forklifts. This embodiment is an optimization based on Embodiment 1 to improve the technical effect and refine the technical solution. For details not described in this embodiment, please refer to Embodiment 1.

[0026] As one embodiment, reference Figure 1 The forklift electric drive system assembly also includes a travel and hydraulic motor controller 4. The travel and hydraulic motor controller 4 is electrically connected to the hydraulic drive motor 5 and the travel drive motor 6, respectively, and is fixed to the same side of both motors. This embodiment makes full use of the remaining space of the hydraulic drive motor 5 and the travel drive motor 6, and takes into account their similar shapes. The travel and hydraulic motor controller 4 is arranged in the regular space above the hydraulic drive motor 5 and the travel drive motor 6, allowing the travel and hydraulic motor controller 4 to directly control the hydraulic drive motor 5 and the travel drive motor 6, reducing cable length and improving integration.

[0027] In the existing technology, the travel reducer and the hydraulic reducer are located in the same closed chamber. There are many scenarios where electric forklifts travel and hydraulic drive work in parallel. When the travel reducer and the hydraulic reducer work at the same time, they stir up oil and affect each other, resulting in low efficiency. At the same time, they share a common housing and end cover, and the distance from each bearing position to the end face must be guaranteed at the same time. This makes the processing and assembly difficult, costly, and maintainable.

[0028] As one embodiment, reference Figure 3 The travel and hydraulic reducer 1 is equipped with a partition wall 103, which isolates the travel reduction gear set 104 and the hydraulic reduction gear set 105. In traditional hydraulic reducers, the rotation of the travel reduction gear set and the hydraulic reduction gear set can affect each other's operation by stirring the oil. However, in the embodiment provided, the partition wall 103 separates the chambers containing the travel reduction gear set 104 and the hydraulic reduction gear set 105, thus avoiding mutual interference from oil stirring. This also reduces assembly difficulty and improves maintainability.

[0029] As one embodiment, reference Figure 3 The second housing 201 of the electromagnetic brake 2 is fixedly connected to the first housing 102 of the travel and hydraulic reducer 1. During braking, the electromagnetic brake 2 is subjected to opposing forces and torques. Therefore, fixing the second housing 201 to the first housing 102 of the travel and hydraulic reducer 1, for example, by integrating them, can improve the stability of the electromagnetic brake 2. Simultaneously, fixing the second housing 201 and the first housing 102 together can improve the heat transfer efficiency between them, thereby reducing the space required for heat dissipation components.

[0030] As one embodiment, reference Figure 3 The sixth external spline 601 of the travel drive motor 6 is torque-transmittingly connected to the first internal spline 10101 of the first-stage drive gear 101 of the travel and hydraulic reducer; the first internal spline 10101 is also torque-transmittingly connected to the second internal spline 20201 of the electromagnetic brake 2, and the second internal spline 20201 is connected to the friction plate assembly 203; the electromagnetic brake 2 also includes an adjustable armature 202, which is used to press the friction plate assembly 203 to brake the first-stage drive gear 101 of the travel and hydraulic reducer. Braking the first-stage drive gear 101 of the travel and hydraulic reducer by pressing the friction plate assembly 203 is a more efficient method. Furthermore, since the sixth external spline 601 of the travel drive motor 6 is torque-transmittingly connected to the first internal spline 10101 of the first-stage drive gear 101 of the travel and hydraulic reducer, and the second internal spline 20201 is connected to the friction plate assembly 203, the torque transmission process involves fewer components, resulting in a simpler structure and reducing the occurrence of jamming during braking.

[0031] In one embodiment, the friction plate assembly 203 includes alternating outer friction plate assemblies 20302 and inner friction plate assemblies 20301. An adjustable armature 202 drives the outer friction plate assemblies 20302 and inner friction plate assemblies 20301 to press against each other, achieving the braking effect of the travel mechanism and the primary drive gear 101 of the hydraulic reducer. By dividing the friction plate assembly 203 into outer friction plate assemblies 20302 and inner friction plate assemblies 20301, and with multiple outer and inner friction plates interleaved, the friction and heat experienced by a single friction plate during braking can be reduced.

[0032] As one embodiment, based on the above, and with reference to... Figure 4 The outer friction plate assembly 20302 is fixedly connected to the second housing 201 via a first spline, and the inner friction plate assembly 20301 is fixedly connected to the second inner spline 20201 via a second spline. When the adjustable armature 202 is not driving the outer friction plate assembly 20302 and the inner friction plate assembly 20301 to press against each other, the inner friction plate assembly 20301 can rotate relative to the outer friction plate assembly 20302. When the adjustable armature 202 drives the outer friction plate assembly 20302 and the inner friction plate assembly 20301 to press against each other, the outer friction plate assembly 20302 resists the relative rotation of the inner friction plate assembly 20301 through friction. Fixing the outer friction plate assembly 20302 to the inner wall of the second housing 201 can prevent the outer friction plate assembly 20302 from being pulled off by the inner friction plate assembly 20301.

[0033] As one embodiment, based on the above, and with reference to... Figure 4The magnetic yoke 206 is connected to the outer side of the second inner spline 20201. The inner friction plate group 20301 is located on the outer side of the magnetic yoke 206, which is located inside the second housing 201. Direct transmission between the inner friction plate group 20301 and the second inner spline 20201 is achieved through the magnetic yoke 206. The inner friction plate group 20301 rotates with the second inner spline 20201. When the adjustable armature 202 drives the outer friction plate group 20302 and the inner friction plate group 20301 to press against each other, the outer friction plate group 20302 resists the relative rotation of the inner friction plate group 20301 through friction, thereby braking the second inner spline 20201. Finally, the first inner spline 10101 brakes the travel drive motor 6.

[0034] As one embodiment, based on the above, and with reference to... Figure 4 The electromagnetic brake 2 also includes a coil 205 and an elastic reset member 207 with pre-set openings on the magnetic yoke 206. The coil 205 and the reset spring 207 are arranged in the same direction along the second inner spline 20201. When the coil 205 is energized, it can attract the adjustable armature 202 to move, so that the adjustable armature 202 drives the outer friction plate group 20302 and the inner friction plate group 20301 to press against each other; when the coil 205 is de-energized, the elastic reset member 207 is used to drive the adjustable armature 202 to return to its original position.

[0035] When in use, the coil 205 is energized, attracting the adjustable armature 202 to move toward the coil 205. As the adjustable armature 202 moves toward the coil 205, it drives the outer friction plate group 20302 and the inner friction plate group 20301 to press against each other, thus achieving braking. At the same time, the elastic reset member 207 is also compressed. After the coil 205 is de-energized, the elastic reset member 207 releases its elastic potential energy, pushing the adjustable armature 202 to reset and releasing the pressing state between the outer friction plate group 20302 and the inner friction plate group 20301.

[0036] As one embodiment, the elastic reset member 207 includes a spring and a spring block connected to the spring.

[0037] In one embodiment, a slip ring 204 is provided on the side of the magnetic yoke 206 away from the second inner spline 20201. The slip ring 204 can act like a bearing and is used to reduce the friction force on the magnetic yoke 206 from the inner wall of the second outer shell 201. The slip ring 204 is located on the side of the friction plate group 203 away from the adjustable armature 202, thus eliminating the potential interference of electromagnetic induction on the operation of the adjustable armature 202.

[0038] Furthermore, the electric drive system assembly for forklifts provided in this embodiment integrates transmission, drive, and braking into one unit. The electromagnetic brake 2, positioned at high speed and low torque, can significantly reduce the required braking torque and the required outer diameter of the brake pads (i.e., friction pads). Efficiently integrating the forklift's transmission, drive, and braking systems effectively improves space utilization and reliability, reduces assembly weight and cost, and facilitates vehicle installation. Simultaneously, this invention eliminates the need for external connecting cables, reducing resistance caused by excessively long cables and improving efficiency.

[0039] because Figure 1 and Figure 2 The electric drive system assembly for the forklift shown is quite complex. Figure 5 Zhihe Figure 10 These are schematic diagrams showing the arrangement of the travel and hydraulic motor controller 4, travel and hydraulic reducer 1, electromagnetic brake 2, hydraulic oil pump 3, hydraulic drive motor 5, and travel drive motor 6 relative to other components of the forklift's electric drive system assembly. Figure 6 For example, the travel and hydraulic motor controller 4 is colored while other parts of the forklift electric drive system assembly are blurred.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "located in," "equipped with," "located in," "installed," "set," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. "Hinged connection" includes "rotational connection."

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electric drive system assembly for a forklift truck, characterized by, include: The walking and hydraulic reducer (1), the hydraulic drive motor (5) and the walking drive motor (6) are arranged in parallel on the same side of the walking and hydraulic reducer (1). The hydraulic drive motor (5) and the walking drive motor (6) are respectively connected to the walking and hydraulic reducer (1) for transmission. The electromagnetic brake (2) and the hydraulic oil pump (3) are located on the side of the walking and hydraulic reducer (1) away from the hydraulic drive motor (5) and the walking drive motor (6). The electromagnetic brake (2) brakes the first-stage drive gear (101) of the walking and hydraulic reducer (1). The hydraulic oil pump (3) is connected to the walking and hydraulic reducer (1) for transmission. The second housing (201) of the electromagnetic brake (2) is fixedly connected to the first housing (102) of the travel and hydraulic reducer (1); the sixth external spline (601) of the travel drive motor (6) is torsionally connected to the first internal spline (10101) of the first-stage drive gear (101) of the travel and hydraulic reducer; the first internal spline (10101) is also torsionally connected to the second internal spline (20201) of the electromagnetic brake (2), and the second internal spline (20201) is connected to the friction plate assembly (203); the electromagnetic brake (2) also includes an adjustable armature (202), which is used to press the friction plate assembly (203) to brake the first-stage drive gear (101) of the travel and hydraulic reducer.

2. The electric drive system assembly for a forklift truck of claim 1, wherein, It also includes a walking and hydraulic motor controller (4); the walking and hydraulic motor controller (4) is electrically connected to the hydraulic drive motor (5) and the walking drive motor (6) respectively, and the walking and hydraulic motor controller (4) is fixed on the same side of the hydraulic drive motor (5) and the walking drive motor (6).

3. The electric drive system assembly for a fork truck of claim 1, wherein, The walking and hydraulic reducer (1) is provided with a partition wall (103) for isolating the walking reduction gear set (104) and the hydraulic reduction gear set (105).

4. The electric drive system assembly for a fork truck of claim 1, wherein, The friction plate group (203) includes an alternating outer friction plate group (20302) and an inner friction plate group (20301). The adjustable armature (202) is used to drive the outer friction plate group (20302) and the inner friction plate group (20301) to press against each other to achieve braking of the first-stage drive gear (101) of the walking and hydraulic reducer.

5. The electric drive system assembly for forklifts according to claim 4, characterized in that, The outer friction plate group (20302) is fixedly connected to the inner wall of the second outer shell (201), and the inner friction plate group (20301) is fixedly connected to the second inner spline (20201) through the magnetic yoke (206). When the adjustable armature (202) does not drive the outer friction plate group (20302) and the inner friction plate group (20301) to press against each other, the inner friction plate group (20301) can rotate relative to the outer friction plate group (20302). When the adjustable armature (202) drives the outer friction plate group (20302) and the inner friction plate group (20301) to press against each other, the outer friction plate group (20302) resists the relative rotation of the inner friction plate group (20301) through friction.

6. The electric drive system assembly for forklifts according to claim 5, characterized in that, The magnetic yoke (206) is connected to the outside of the second internal spline (20201), the internal friction plate group (20301) is located on the outside of the magnetic yoke (206), and the magnetic yoke (206) is located inside the second outer shell (201).

7. The electric drive system assembly for forklifts according to claim 6, characterized in that, The electromagnetic brake (2) further includes a coil (205) and an elastic reset member (207) disposed in a preset opening of the magnetic yoke (206), wherein the coil (205) and the elastic reset member (207) are arranged in the same direction along the second inner spline (20201); When the coil (205) is energized, it can attract the adjustable armature (202) to move, so that the adjustable armature (202) drives the outer friction plate group (20302) and the inner friction plate group (20301) to press against each other; when the coil (205) is de-energized, the elastic reset member (207) is used to drive the adjustable armature (202) to return to its original position.

8. The electric drive system assembly for forklifts according to claim 7, characterized in that, The magnetic yoke (206) is provided with a slip ring (204) on the side away from the second internal spline (20201). The slip ring (204) is used to reduce the friction between the magnetic yoke (206) and the inner wall of the second outer shell (201). The slip ring (204) is located on the side of the friction plate group (203) away from the adjustable armature (202).

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