Electric drive system structure and engineering machinery

Abstract

The utility model discloses an electric drive system structure and engineering machinery. The electric drive system structure comprises a box body, an upper frame and a housing, a plurality of power battery units which are stacked up and down are assembled in the box body; the upper frame is installed on the top face of the box body and used for assembling the control unit and the heat management unit. The housing is formed by splicing a lower frame body and an upper cover body and used for sealing the box body, the upper frame, the control unit and the heat management unit which are integrated together in an inner containing cavity of the housing, and the housing is provided with an access door and a ventilation opening. According to the utility model, auxiliary parts required in the process of transforming the traditional engineering machinery into hybrid power or pure electric engineering machinery (except a motor and part of wire harnesses) are integrated together, and the structural layout of the traditional equipment does not need to be scattered and redesigned; the utility model has the advantages of low transformation cost, short period, reasonable structure, extensibility and upgrading and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electric drive system structure, belong to engineering machinery technical field. BACKGROUND

[0002] New energy engineering machinery equipment, involving power battery and heat dissipation unit and other components matching use and its layout are different, such as small new energy equipment is generally scattered layout to vehicle chassis or has counterweight and then replaces counterweight position, large new energy mine truck is scattered and arranged to the side of frame and the cab beside or rear of vehicle head.

[0003] The problems and defects of the arrangement to chassis are obvious, in the process of vehicle operation, mud and other foreign matters are immersed, and the probability of bumping damage is large, and maintenance is very inconvenient;

[0004] The scheme of replacing counterweight basically only replaces power battery pack module, and the rest of modules are scattered and arranged, and high-low voltage wire harness and cooling pipeline path layout trend is complex and long, which brings great difficulty to maintenance.

[0005] Arrangement to the side of frame affects the strength of frame, and the space on the side is limited, and the structure layout is not very reasonable;

[0006] Arrangement to the vicinity of cab has safety hazard, and also brings noise and temperature caused by heat dissipation, which adversely affects driving experience, and is unreasonable.

[0007] Small equipment is limited by its own size, and cannot concentrate all new energy supporting components in integrated arrangement, which requires scattering original layout, cannot utilize original mature and reasonable structure, development cycle is long, trial production performance is unstable, resulting in high modification cost problems;Energy saving and value creation brought by small equipment modification is relatively low compared with medium and large equipment, and the utility model can provide a reliable solution for medium and large new energy engineering machinery equipment.

[0008] At present, engineering machinery electricization related supporting components are becoming mature, traditional engineering machinery is constantly updated in the process of iteration, and the structure and function of equipment itself are also perfect, but in the process of fusion with electric supporting components, various conflicts and tests will inevitably occur, including structure rationality, system stability, structure function replaceability and other requirements. SUMMARY

[0009] According to the deficiencies existing in the prior art, the utility model provides a kind of electric drive system structure, this structure is needed during the process of traditional engineering machinery is reformed into hybrid or pure electric engineering machinery (except motor and part of its wire harness) auxiliary supporting kit integration together, without to traditional equipment structure layout scatter redesign, only to original layout is adjusted locally, the structure module of the utility model is arranged integrally on equipment, to quickly complete product iteration update, save time and economic cost for manufacturer, user can obtain instant benefit by electric product reform and upgrade, the utility model has the advantages of low reform cost, short cycle, reasonable structure, can be expanded and upgraded.

[0010] The utility model realizes according to the following technical solutions:

[0011] In a first aspect, the utility model provides a kind of electric drive system structure, comprising:

[0012] Box, its inside assembly is equipped with multiple power battery units stacked together upwards and downwards;

[0013] Upper frame, installation is in the top surface of the box, for assembly control unit and thermal management unit;

[0014] Cover, by the frame of lower part and the cover of upper part splicing composition, for the box, upper frame, control unit and thermal management unit integrated together are closed in its internal accommodation cavity, and the cover is equipped with access door and vent.

[0015] In some embodiments, the control unit includes low voltage box, high voltage box, motor controller and DC / DC converter;The thermal management unit includes water tank, water pump, water cooling unit;The upper frame includes upper frame upper layer and upper frame lower layer;The water cooling unit, low voltage box, water pump are placed in the upper frame lower layer, and the DC / DC converter, motor controller, high voltage box, water tank are placed in the upper frame upper layer.

[0016] In some embodiments, the high voltage wire harness of power battery unit in the box goes up to the bottom of high voltage box of upper frame upper layer in positive direction, and is electrically connected, then extends to the side motor controller from the bottom of high voltage box, and is electrically connected, then extends to motor from motor controller, and is electrically connected;The inlet end of the water pump is communicated with the water tank, the outlet end of the water pump is communicated with the inlet end of the internal water pipe of motor controller, motor and power battery unit through the water pipe assembly of pipeline assembly, the outlet end of the internal water pipe of motor controller, motor and power battery unit is communicated with water cooling unit through water pipe assembly, and the water cooling unit is communicated with the water tank through water pipe assembly;The DC / DC converter is electrically connected with the high voltage box, water cooling unit and water pump through the lead assembly of pipeline assembly.

[0017] In some embodiments, the lower frame is composed of a right side plate, a left side plate, a rear cover plate and a front cover plate fixed together by detachable components; the upper part of the right side plate is provided with an air inlet, and the upper part of the left side plate is provided with an air outlet, and the air inlet and the air outlet are both opposite to the water cooling unit.

[0018] In some embodiments, the upper cover is composed of two L-shaped plates butted together to form an n-shaped plate and two side covers respectively located at the opening surfaces of the two sides of the n-shaped plate, and the n-shaped plate and the two side covers are fixed together by detachable components; the vertical plates of the two L-shaped plates are both provided with two maintenance doors, one of which is opposite to the water tank for filling the cooling liquid into the water tank, and the other of which is opposite to the high-voltage box for maintenance and repair of the high-voltage box.

[0019] In some embodiments, the horizontal top plate of the L-shaped plate is provided with at least one lifting ring for disassembling and assembling the L-shaped plate by cooperating with the lifting rope.

[0020] In some embodiments, the upper frame is composed of four longitudinal beams and a plurality of cross beams; the bottoms of the four longitudinal beams are respectively fixed at the four corners of the top surface of the box body by bolts; a plurality of cross beams located on the same horizontal plane are welded at the middle and lower parts of the four longitudinal beams to form the lower layer of the upper frame; a plurality of cross beams located on the same horizontal plane are welded at the top of the four longitudinal beams to form the upper layer of the upper frame.

[0021] In some embodiments, the box body comprises two opposite side plates, a rear plate, a front cover plate, a cover plate and a bottom frame; the two side plates, the rear plate and the bottom frame are welded together, the cover plate is fixed on the top surface of the two side plates and the rear plate, the front cover plate is fixed together with the two side plates, the cover plate and the bottom frame in a detachable manner, and a plurality of power battery unit assemblies are pushed into the box body from the side opening left after the front cover plate is removed.

[0022] In some embodiments, each of the two side edges of the front cover plate is provided with a vertical angle steel, the angle steel is provided with a plurality of threaded holes, the two side plates and the front cover plate are provided with through holes coaxially arranged with the threaded holes; the two angle steels cooperate with a plurality of bolts to fix the two side plates and the front cover plate together; the top and bottom edges of the front cover plate are each provided with a plurality of threaded holes, the cover plate and the bottom frame are provided with through holes coaxially arranged with the threaded holes, and the front cover plate is fixed together with the cover plate and the bottom frame by a plurality of bolts; the front cover plate is provided with a window, the window is sealed by a detachable maintenance plate; the upper part of each of the two side plates is provided with at least two symmetrically arranged lifting lugs, and the lifting lugs are fixed on the annular side plate by three triangularly arranged screws.

[0023] In the second aspect, the utility model provides an engineering machinery which comprises the electric drive system structure.

[0024] Compared with the prior art, the utility model has the beneficial effects as follows:

[0025] The power battery unit, the control unit and the heat management unit are integrated, the structure is compact and reasonable, the wire harness and the pipeline path demand are short, the box body and the upper frame can be fixed separately in combination with the space layout, the problems of narrow installation layout space and difficult installation and disassembly are solved;

[0026] The power battery unit is directly pushed into the installation point, and the power battery unit is conveniently disassembled;

[0027] The air duct is designed to fully utilize the structure of the electric drive system in the whole vehicle position, adopt a straight-through air inlet and outlet path, no bend block, and the heat dissipation effect is optimal;

[0028] The triangular layout of the lifting lug can effectively solve the influence of the lateral force on the loosening of the fixing screw in addition to the downward gravity during lifting;

[0029] The cover and the box body are provided with maintenance plates, and the internal components can be maintained and repaired without removing the whole plate;

[0030] The relative positions of the heat dissipation system related parts are close, the pipeline path is short, the cold water supply is fast, and the heat dissipation efficiency is high;

[0031] The relative positions of the electric system related parts are close, the wire harness path is short, the signal exchange and coordination cost is reduced, the transmission efficiency is improved, the response is fast, the cost is reduced, and the weight is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings are part of the utility model and serve to provide a further understanding of the utility model, the schematic embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained according to the drawings without creative labor for ordinary skilled in the art.

[0033] In the drawings:

[0034] Figure 1 It is a whole schematic view of the cover of the utility model;

[0035] Figure 2 It is an exploded schematic view of the cover of the utility model;

[0036] Figure 3 It is an exploded schematic view of the box body of the utility model;

[0037] Figure 4 It is a schematic view of the electric drive system structure of the utility model (the structure after removing the cover).

[0038] Fig. 1, cabinet; 2, upper frame; 3, lower layer of upper frame; 4, water cooling unit; 5, upper layer of upper frame; 6, water tank; 7, DC / DC converter; 8, motor controller; 9, high-voltage box; 10, low-voltage box; 11, water pump; 12, charging port; 13, plug-in interface; 14, pipeline assembly; 15, right side plate; 16, air inlet; 17, rear closure plate; 18, access door one; 19, cover body; 20, access door two; 21, lifting ring; 22, air outlet; 23, side cover; 24, left side plate; 25, front closure plate; 26, side plate; 27, rear plate; 28, front closure plate; 29, cover plate; 30, base frame; 31, access plate; 32, lifting lug; 33, angle steel.

[0039] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application by referring to specific embodiments. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application, and the following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0041] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device or element indicated to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] As Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, an electric drive system structure includes a housing 1, an upper frame 2, and a cover; the housing 1 is equipped with multiple power battery units stacked together; the upper frame 2 is installed on the top surface of the housing 1 and is used to assemble the control unit and the thermal management unit; the cover is composed of a lower frame and an upper cover 19 spliced ​​together, and is used to enclose the integrated housing 1, upper frame 2, control unit and thermal management unit in its internal cavity, and the cover is provided with an inspection door and a ventilation opening.

[0044] The control unit and thermal management unit described above will be further explained below.

[0045] like Figure 4 As shown, the control unit includes a low-voltage box 10, a high-voltage box 9, a motor controller 8, and a DC / DC converter 7; the thermal management unit includes a water tank 6, a water pump 11 (with a charging port 12 and a plug interface 13), and a water-cooled unit 4; the upper frame 2 includes an upper frame layer 5 and an upper frame lower layer 3; the water-cooled unit 4, the low-voltage box 10, and the water pump 11 are placed in the lower frame layer 3, and the DC / DC converter 7, the motor controller 8, the high-voltage box 9, and the water tank 6 are placed in the upper frame layer 5.

[0046] Further plans will continue to be considered. Figure 4 As shown, the high-voltage wiring harness of the power battery unit in the housing 1 extends upwards to the bottom of the high-voltage box 9 on the upper frame 5 and is electrically connected to it. It then extends from the bottom of the high-voltage box 9 to the side motor controller 8 and is electrically connected to it. It then extends from the motor controller 8 to the motor and is electrically connected to it. The inlet end of the water pump 11 is connected to the water tank 1. The outlet end of the water pump 11 is connected to the inlet end of the internal water pipe of the motor controller 8, the motor, and the power battery unit through the water pipe assembly of the pipeline assembly 14. The outlet end of the internal water pipe of the motor controller 8, the motor, and the power battery unit is connected to the water-cooled unit 4 through the water pipe assembly. The water-cooled unit 4 is connected to the water tank 6 through the water pipe assembly. The DC / DC converter 7 is electrically connected to the high-voltage box 9, the water-cooled unit 4, and the water pump 11 through the wire assembly of the pipeline assembly 14.

[0047] It should be noted that the water tank 6 is powered by the water pump 11, and supplies cold water to the motor controller 8, motor, and power battery through the water pipe assembly 14. The cold water flows out through the internal water pipes of the motor controller 8, motor, and power battery, while the hot water, carrying away heat, enters the water-cooled unit 4. The water-cooled unit 4 performs air cooling on the hot water, and the cooled water then flows back into the water tank 6. The height of the water tank 6 must be higher than the height of all the devices being cooled to ensure normal water circulation. The components of the cooling system are relatively close together, the pipe paths are short, the cold water supply is fast, and the cooling efficiency is high. The components of the electrical system are relatively close together, the wiring harness paths are short, reducing signal exchange and coordination costs, improving transmission efficiency, and resulting in fast response, cost reduction, and weight reduction.

[0048] The specific structure of the above-mentioned cover is further described as follows.

[0049] As shown in Figure 1 , Figure 2 , the lower frame is composed of the right side plate 15, the left side plate 24, the rear cover plate 17 and the front cover plate 25 which are fixed together with the cabinet 1 through detachable components; the upper part of the right side plate 15 is provided with the air inlet 16, and the upper part of the left side plate 24 is provided with the air outlet 22, and the air inlet 16 and the air outlet 22 are both opposite to the water cooling unit 4, so as to ensure that the cold air enters from the air inlet 16 and the hot air blows out from the air outlet 22 when the water cooling unit 4 works, thereby avoiding the circulation backflow phenomenon.

[0050] Further, as shown in Figure 1 , Figure 2 , the upper cover 19 is composed of two L-shaped plates which are butted together to form an n-shaped plate and two side covers 23 which are respectively located at the two opening surfaces of the n-shaped plate, and the n-shaped plate and the two side covers 23 are fixed together through detachable components; the vertical plates of the two L-shaped plates are both provided with two maintenance doors, wherein the maintenance door one 18 is opposite to the water tank 6 and is used for adding cooling liquid into the water tank 6, and the maintenance door two 20 is opposite to the high-voltage box 9 and is used for maintaining and repairing the high-voltage box 9.

[0051] It should be noted that the lock cores of the maintenance door one 18 and the maintenance door two 20 are unified with the general lock core of the whole vehicle, so as to facilitate the maintenance and management of the whole vehicle, and the side cover 23 generally does not affect the maintenance.

[0052] Further, as shown in Figure 1 , Figure 2 , the horizontal top plate of the L-shaped plate is provided with at least one lifting ring 21 which is used for cooperating with a lifting rope to disassemble and assemble the L-shaped plate; when the electrical elements and the pipeline bundles on the upper layer 5 of the upper frame involve a large amount of maintenance, the upper cover 19 can be disassembled to a suitable position through the lifting ring 21 and then placed for maintenance.

[0053] The specific structure of the above-mentioned upper frame is further described as follows.

[0054] As shown in Figure 4 , the upper frame 2 is composed of four longitudinal beams and multiple horizontal beams which are spliced together; the bottoms of the four longitudinal beams are respectively fixed at the four corners of the top surface of the cabinet 1 through bolts; the multiple horizontal beams located on the same horizontal plane are welded at the middle and lower parts of the four longitudinal beams to form the lower layer 3 of the upper frame; and the multiple horizontal beams located on the same horizontal plane are welded at the top parts of the four longitudinal beams to form the upper layer 5 of the upper frame.

[0055] The specific structure of the above-mentioned cabinet is further described as follows.

[0056] As shown in Figure 3 , Figure 4As shown, the box body 1 includes two opposite side plates 26, a rear plate 27, a front sealing plate 28, a cover plate 29 and a bottom frame 30; the two side plates 26, the rear plate 27 and the bottom frame 30 are welded together, the cover plate 29 is fixed on the top surfaces of the two side plates 26 and the rear plate 27, the front sealing plate 28 is detachably fixed with the two side plates 26, the cover plate 29 and the bottom frame 30, and a plurality of power battery unit assemblies are pushed into the box body 1 from the side openings left after the front sealing plate 28 is removed.

[0057] Further, as shown in Figure 3 、 Figure 4 As shown, each of the two side edges of the front sealing plate 28 is provided with a vertical angle steel 33, the angle steel 33 is provided with a plurality of threaded holes, the two side plates 26 and the front sealing plate 28 are provided with through holes coaxially arranged with the threaded holes; the two angle steels 33 are matched with a plurality of bolts to fix the two side plates 26 and the front sealing plate 28 together; the top and bottom edges of the front sealing plate 28 are each provided with a plurality of threaded holes, the cover plate 29 and the bottom frame 30 are provided with through holes coaxially arranged with the threaded holes, and the front sealing plate 28 is fixed with the cover plate 29 and the bottom frame 30 by a plurality of bolts; the front sealing plate 28 is provided with a window, the window is blocked by a detachable inspection plate 31; the upper portions of the two side plates 26 are each provided with two symmetrically arranged lifting lugs 32, the lifting lugs 32 are fixed on the two side plates 26 by three triangularly arranged screws; when the four lifting lugs 32 are used for lifting, the lifting device will generate a certain inclined tension on each lifting lug 32, and the triangularly arranged fixing screw mode is used to avoid the screw loosening phenomenon caused by the back and forth pulling and vibration of the lifting lugs 32 due to the inclined tension generated during frequent lifting.

[0058] It should be noted that the box body 1 is customized for power battery units, the size is changed according to the shape size and quantity demand of the power battery units, and mainly solves the problems of assembly, sealing and convenient maintenance of the power battery units.

[0059] In summary, the electric drive system structure provided by the utility model has the following functions and effects:

[0060] The dispersed layout is innovatively improved into integrated layout: the power battery unit, the control unit and the thermal management unit are integrated, the structure is compact and reasonable, the wire harness and pipeline path demand are short, the box body and the upper frame can be fixed separately in combination with the space layout; the problems of narrow installation layout space and difficult installation and disassembly are solved;

[0061] The assembly of the power battery unit is improved into direct flat pushing into the installation point, which is convenient for disassembling the power battery unit;

[0062] The design of the air duct fully utilizes the electric drive system structure in the whole vehicle position, adopts straight-through type air inlet and outlet path, has no bend blockage, and has optimal heat dissipation effect;

[0063] The lug triangular layout can effectively solve the influence of the lateral force on the loosening of the fixing screw in addition to the downward gravity during lifting;

[0064] The cover and the box are provided with maintenance plates, and internal components can be maintained and repaired without removing the whole plate.

[0065] The relative positions of the components of the cooling system are close, the pipeline path is short, the cold water supply is fast, and the cooling efficiency is high.

[0066] The relative positions of the components of the electrical system are close, the wire harness path is short, the signal exchange and coordination cost is reduced, the transmission efficiency is improved, the response is fast, and the cost and weight are reduced.

[0067] The engineering machinery provided by the utility model is described below, and the engineering machinery described below can be correspondingly referred to the electrical drive system structure described above.

[0068] The engineering machinery provided by the utility model can include the electrical drive system structure described in any one of the above embodiments.

[0069] The beneficial effects achieved by the engineering machinery provided by the utility model are consistent with the beneficial effects achieved by the electrical drive system structure provided by the utility model, and therefore will not be described here.

[0070] It should be noted that the above engineering machinery can be a mine dump truck.

[0071] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0072] In addition, those skilled in the art can understand that although some embodiments described herein include certain features contained in other embodiments but not others, combinations of features of different embodiments also mean that they are within the protection scope of the utility model and form different embodiments. For example, in the above embodiments, those skilled in the art can use in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0073] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any skilled person in the art can make minor changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the present application.

Claims

1. An electric drive system structure, characterized in that, include: The housing contains multiple power battery units stacked one on top of the other. The upper frame, mounted on the top surface of the enclosure, is used to assemble the control unit and the thermal management unit; The enclosure, consisting of a lower frame and an upper cover, is used to enclose the integrated housing, upper frame, control unit and thermal management unit in its internal cavity, and the enclosure is provided with an inspection door and a ventilation opening.

2. The electric drive system structure according to claim 1, characterized in that: The control unit includes a low-voltage box, a high-voltage box, a motor controller, and a DC / DC converter; the thermal management unit includes a water tank, a water pump, and a water-cooled unit. The upper frame includes an upper layer and a lower layer; the water-cooled unit, low-pressure box, and water pump are placed in the lower layer of the upper frame, and the DC / DC converter, motor controller, high-pressure box, and water tank are placed in the upper layer of the upper frame.

3. The electric drive system structure according to claim 2, characterized in that: The high-voltage wiring harness of the power battery unit in the enclosure goes straight up to the bottom of the high-voltage box on the upper frame and is electrically connected to it. Then it extends from the bottom of the high-voltage box to the side motor controller and is electrically connected to it. Then it extends from the motor controller to the motor and is electrically connected to it. The inlet end of the water pump is connected to the water tank, and the outlet end of the water pump is connected to the inlet end of the internal water pipe of the motor controller, motor and power battery unit through the water pipe assembly of the pipeline assembly. The outlet end of the internal water pipe of the motor controller, motor and power battery unit is connected to the water-cooled unit through the water pipe assembly, and the water-cooled unit is connected to the water tank through the water pipe assembly. The DC / DC converter is electrically connected to the high-voltage box, water-cooled unit, and water pump via the wiring assembly of the pipeline assembly.

4. The electric drive system structure according to claim 2, characterized in that: The lower frame consists of a right side panel, a left side panel, a rear sealing panel, and a front sealing panel that are fixed to the box body by detachable parts; An air inlet is provided on the upper part of the right side plate, and an air outlet is provided on the upper part of the left side plate, with both the air inlet and the air outlet facing the water-cooled unit.

5. The electric drive system structure according to claim 2, characterized in that: The upper cover is composed of two L-shaped plates joined together to form an n-shaped plate and two side covers located on the openings on both sides of the n-shaped plate. The n-shaped plate and the two side covers are fixed together by detachable components. Each of the two L-shaped plates has two inspection doors on its uprights. One inspection door faces the water tank and is used to add coolant to the water tank. The other inspection door faces the high-voltage box and is used to inspect and maintain the high-voltage box.

6. The electric drive system structure according to claim 5, characterized in that: At least one lifting ring is provided on the horizontal top plate of the L-shaped plate, which is used to assemble and disassemble the L-shaped plate with the help of a lifting rope.

7. The electric drive system structure according to claim 2, characterized in that: The upper frame is composed of four longitudinal beams and multiple transverse beams; the bottom of the four longitudinal beams is fixed to the four corners of the top surface of the box body by bolts; multiple transverse beams located on the same horizontal plane are welded to the lower middle part of the four longitudinal beams to form the lower layer of the upper frame; multiple transverse beams located on the same horizontal plane are welded to the top of the four longitudinal beams to form the upper layer of the upper frame.

8. The electric drive system structure according to claim 1, characterized in that: The housing includes two opposing side panels, a rear panel, a front sealing panel, a cover plate, and a base frame; the two side panels, the rear panel, and the base frame are welded together, the cover plate is fixed to the top surface of the two side panels and the rear panel, and the front sealing panel is detachably fixed to the two side panels, the cover plate, and the base frame. Multiple power battery unit assemblies are pushed into the housing through the side opening left after the front sealing panel is removed.

9. The electric drive system structure according to claim 8, characterized in that: Each of the two sides of the front sealing plate is provided with a vertically arranged angle steel, and the angle steel is provided with multiple threaded holes. The two side plates and the front sealing plate are provided with through holes arranged coaxially with the threaded holes. The two angle steels are engaged with multiple bolts to fix the two side plates and the front sealing plate together. The front sealing plate is provided with multiple threaded holes at the top and bottom edges, and the cover plate and the base frame are provided with through holes arranged coaxially with the threaded holes. The front sealing plate is fixed together with the cover plate and the base frame by multiple bolts. The front cover plate has a window, which is sealed by a removable access plate; Each of the two side plates has at least two symmetrically arranged lifting lugs on its upper part, and the lifting lugs are fixed to the annular side plate by three screws arranged in a triangle.

10. An engineering machinery, characterized in that: The electric drive system structure includes any one of claims 1 to 9.

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