Chassis structure of double-hydrogen fuel cell engine tractor

Abstract

The invention discloses a chassis arrangement structure of a tractor with a dihydrofuel cell system. Comprising a hydrogen fuel cell engine I, a hydrogen fuel cell engine II, a power battery pack, an integrated control module, an electric driving system, a hydrogen storage system, a fuel cell heat dissipation module, a fuel cell cooling pipeline, a high-voltage wiring harness, a charging port, a fuel cell air filter I, a fuel cell air filter II, a power battery bracket, a left frame and a right frame, all parts are reasonably arranged, the structure is compact, and arrangement of high-low pressure separation, water paths, lines, gas paths and the like is fully considered; fuel cell systems of different manufacturers are considered, and a central drive configuration and an electric drive bridge configuration are also considered; the hydrogen fuel cell system, the heat dissipation system and the power cell system are symmetrically arranged, so that the trend of a pipeline bundle is smoother, and production, debugging and maintenance are facilitated.

Description

Technical Field

[0001] The invention relates to a chassis arrangement structure of a dual hydrogen fuel cell system tractor, belonging to the technical field of design and manufacturing of commercial vehicle chassis. Background Art

[0002] As a clean, carbon-free energy source, hydrogen plays an important role in the field of commercial vehicles. In order to meet the operating scenarios, low hydrogen consumption and long life requirements of hydrogen fuel cell commercial vehicles, the rated power of the hydrogen fuel cell system matched with commercial vehicles must be ≥220Kw. At present, the technology of single hydrogen fuel cell systems with a power of 220Kw and above is still immature and expensive. In order to take into account the cost, the use of a dual hydrogen fuel cell system and the design of commercial vehicles that meet user needs have become the best solution. However, the dual hydrogen fuel cell system is more complex in size, weight and accessory connections than the single hydrogen fuel cell system. If it is not arranged reasonably, it will be difficult to produce and assemble, and difficult for users to maintain; if the volume occupied is too large, it will affect the hydrogen storage capacity and chassis space utilization. Specifically: 1) The dual hydrogen fuel cell system is arranged behind the cab and on the frame, with the dual fuel cell system on the lower side and the hydrogen storage system on the upper side. The disadvantage is that the space of the hydrogen storage system is occupied, the hydrogen storage capacity becomes smaller, and the vehicle's cruising range becomes worse. 2) The dual hydrogen fuel cell system is arranged under the cab and in the middle of the frame, one in front and one in the back. The disadvantage is that it is difficult to install accessories such as heat dissipation, intake and exhaust of the hydrogen fuel cell system. Part of the hydrogen fuel cell system at the rear of the vehicle is located under the hydrogen storage system, which is difficult to inspect and maintain. 3) Regarding vehicle power distribution, the dual hydrogen fuel cell system requires two-way power distribution. At present, the distribution boxes of most manufacturers in the market only support one fuel cell circuit, and additional distribution boxes are required to realize the function. This increases the number of components and wiring harnesses, and the wiring harnesses are more prone to cross-cutting and confusion. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a chassis arrangement structure of a dual hydrogen fuel cell system tractor with a reasonable layout and compact structure in view of the defects in the prior art.

[0004] In order to solve this technical problem, the present invention provides a chassis layout structure of a dual hydrogen fuel cell system tractor, including a hydrogen fuel cell engine 1, a hydrogen fuel cell engine 2, a power battery pack, an integrated control module, an electric drive system, a hydrogen storage system, a fuel cell heat dissipation module, a fuel cell cooling pipeline, a high-voltage wiring harness, a charging port, a fuel cell air filter 1, a fuel cell air filter 2, a power battery bracket, a left frame and a right frame; the power battery bracket is connected to the frame through a transition bracket, and a cross beam 1 and a cross beam 2 are correspondingly arranged at the connection; the power battery pack is fixed on the power battery bracket; the hydrogen fuel cell engine 1 and the hydrogen fuel cell engine 2 are respectively arranged behind an axle and on the left and right sides of the frame on both sides; the power battery pack has a total of four boxes, which are divided into two groups and arranged behind the fuel cell and on the left and right sides of the frame; the integrated control module is fixed under the cab; the electric drive system is an electric drive axle configuration or a central drive configuration; the hydrogen storage system is arranged behind the cab and above the frame; the fuel cell heat dissipation module is arranged behind the cab and above the hydrogen storage system; the fuel cell cooling pipeline is connected to the fuel cell system from the fuel cell heat dissipation module downward; the charging port is a single charging port, which is arranged on the left or right side of the vehicle behind one axle, and a movable protective cover is provided on the charging port; the fuel cell air filter 1 is arranged behind one axle and on the fender bracket; the fuel cell air filter 2 is arranged on the front facade of the hydrogen storage system.

[0005] The chassis layout structure of the dual hydrogen fuel cell system tractor also includes an outrigger, a bracket one, a bracket two, a bracket three and a bracket four. Outriggers are provided on the outside of the left frame and the right frame. The two brackets three are directly connected to the frame. Brackets two and four are fixed on the connecting beam between the outrigger and the power battery bracket. The cooling interface and the intake and exhaust interface of the hydrogen fuel cell engine one and the hydrogen fuel cell engine two face forward, and are respectively connected to bracket two, bracket three and bracket four through four-point or eight-point suspension.

[0006] The hydrogen storage system is composed of multiple gas cylinders placed horizontally or vertically, arranged above the frame and behind the cab, with a working pressure of 35MPa or 70MPa.

[0007] The power battery pack includes a right-side power battery pack and a left-side power battery pack. The left-side power battery pack consists of two boxes, which are arranged on the left side of the frame and behind the first hydrogen fuel cell engine; the right-side power battery pack consists of two boxes, which are arranged on the right side of the frame and behind the second hydrogen fuel cell engine; the right-side power battery pack and the left-side power battery pack are both arranged longitudinally, and their topmost parts do not exceed the upper wing surface of the frame.

[0008] When the electric drive system is of electric drive axle configuration, the electric drive axle is an integrated drive axle, a speed change mechanism, and a motor; when the electric drive system is of central drive configuration, the motor and the gearbox are arranged on the inner side of the middle section of the frame, under the hydrogen storage system, and the motor and the gearbox are connected to the drive axle through a traditional shaft.

[0009] The fuel cell heat dissipation module includes two independent fuel cell heat dissipation modules 2 and 1, each module is integrated with a multi-fan distribution box for dissipating power to the fans; the fuel cell heat dissipation module 1 dissipates heat for the hydrogen fuel cell engine 1, and the fuel cell heat dissipation module 2 dissipates heat for the hydrogen fuel cell engine 2.

[0010] The integrated control module includes an all-in-one controller, an electric steering pump, a two-in-one air conditioner, a low-voltage battery, a BMS, and an integrated control module bracket, wherein the all-in-one controller integrates two fuel cell power distributions, two power battery power distributions, DCDC, and MCU.

[0011] The fuel cell cooling pipeline includes fuel cell cooling pipeline 1 and fuel cell cooling pipeline 2. Fuel cell cooling pipeline 1 is connected downward from fuel cell heat dissipation module 1 to hydrogen fuel cell engine 1, and the middle section is fixed on the left front facade of the hydrogen storage system; fuel cell cooling pipeline 2 is connected downward from fuel cell heat dissipation module 2 to hydrogen fuel cell engine 2, and the middle section is fixed on the right front facade of the hydrogen storage system.

[0012] The fuel cell air filter 1 includes a right fuel cell air filter 1 and a left fuel cell air filter 1. The right fuel cell air filter 1 is arranged behind an axle, on a fender bracket, and on the right side. The left fuel cell air filter 1 is arranged behind an axle, on a fender bracket, and on the left side. It is used for fine filtration and chemical filtration of the fuel cell engine intake air; the fuel cell air filter 2 includes a right fuel cell air filter 2 and a left fuel cell air filter 2, which are arranged on the front facade of the hydrogen storage system, one on each side, and are used for coarse filtration of the fuel cell engine intake air.

[0013] The high-voltage wiring harness is a wiring harness from the all-in-one controller to each high-voltage component, and the frame intermediate wiring harness is arranged on the frame.

[0014] Beneficial effects: The arrangement of the components of the present invention is appropriate and reasonable, with a compact structure, and full consideration is given to the arrangement of high and low pressure separation, waterways, lines, gasways, etc.; it takes into account the fuel cell systems of different manufacturers, the central drive configuration and the electric drive axle configuration, and the high-voltage batteries commonly used in hydrogen fuel in the market; it fully considers modularization and installation and maintenance convenience; it meets the needs of net zero emissions and dual carbon. The present invention makes the direction of the pipeline harness smoother through reasonable layout and symmetrical placement of the hydrogen fuel cell system and its heat dissipation system and power battery system, making it easier to repair the components, significantly improving the modularization, generalization, and integration of the vehicle, and making it easier to produce, debug, and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2A schematic top view of the structure of the present invention;

[0017] Figure 3 It is a schematic front view of the structure of the present invention;

[0018] Figure 4 A schematic side view of the structure of the present invention

[0019] Figure 5 It is a schematic diagram of the structure of the mounting brackets on both sides of the frame of the present invention.

[0020] In the figure: 1. cab; 2. fuel cell cooling module 2; 3. hydrogen storage system; 4. right power battery pack; 5. electric drive system; 6. left power battery pack; 7. hydrogen fuel cell engine 1; 8. fuel cell cooling module 1; 9. integrated control module; 10. hydrogen fuel cell engine 2; 12. right fuel cell air filter 1; 13. left fuel cell air filter 1; 14. fuel cell cooling line 2; 15. fuel cell cooling line 1; 16. right fuel cell air filter 2; 17. left fuel cell air filter 2; 18. high-voltage wiring harness; 19. left frame; 20. outrigger; 21. bracket 1; 22. bracket 2; 23. bracket 3; 24. bracket 4; 25. power battery bracket; 26. crossbeam 1; 27. crossbeam 2; 28. right frame. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1-Figure 5As shown, the present invention provides a chassis layout structure of a dual hydrogen fuel cell system tractor, including a hydrogen fuel cell engine 1 7, a hydrogen fuel cell engine 2 10, a power battery pack, an integrated control module 9, an electric drive system 5, a hydrogen storage system 3, a fuel cell heat dissipation module, a fuel cell cooling pipeline, a high-voltage harness 18, a charging port, a fuel cell air filter 1, a fuel cell air filter 2, a power battery bracket 25, a left frame 19 and a right frame 28; the power battery bracket 25 is connected to the frame through a transition bracket, and a cross beam 1 26 and a cross beam 27 are correspondingly arranged at the connection point to ensure its strength; the power battery pack is fixed on the power battery bracket 25; the hydrogen fuel cell engine 1 7 and the hydrogen fuel cell engine 2 10 are respectively arranged behind an axle and on the left and right sides of the frame, which are convenient for installation, maintenance and Maintenance and accessibility are good; there are a total of 4 power battery packs, which are divided into two groups and arranged behind the fuel cell and on the left and right sides of the frame; the integrated control module 9 is fixed under the cab 1; the electric drive system 5 is an electric drive axle configuration or a central drive configuration; the hydrogen storage system 3 is arranged behind the cab 1 and above the frame; the fuel cell heat dissipation module is arranged behind the cab 1 and above the hydrogen storage system 3; the fuel cell cooling pipeline is connected to the fuel cell system from the fuel cell heat dissipation module downward; the charging port is a single charging port, which is arranged on the left or right side of the vehicle behind the first axle, which is convenient for charging, assembly and maintenance. A movable protective cover is provided on the charging port 19 to increase the waterproof and dustproof effect; the fuel cell air filter 1 is arranged behind the first axle and on the fender bracket; the fuel cell air filter 2 is arranged on the front facade of the hydrogen storage system 3.

[0023] The chassis layout structure of the dual hydrogen fuel cell system tractor also includes an outrigger 20, a bracket 1 21, a bracket 22, a bracket 3 23 and a bracket 4 24. Outriggers 20 are provided on the outside of the left frame 19 and the right frame 28. Two brackets 3 23 are directly connected to the frame. Brackets 22 and 4 24 are fixed on the connecting beam between the outrigger 20 and the power battery bracket 25. The cooling interface and the intake and exhaust interface of the hydrogen fuel cell engine 1 7 and the hydrogen fuel cell engine 2 10 face forward to facilitate the connection of pipelines, and are respectively connected to bracket 2 22, bracket 3 23 and bracket 4 24 through four-point or eight-point suspension.

[0024] The hydrogen storage system 3 is composed of multiple gas cylinders placed horizontally or vertically, arranged above the frame and behind the cab, with a working pressure of 35MPa or 70MPa. It has a modular design and can be adapted to a variety of systems with different hydrogen storage capacities.

[0025] The power battery pack includes a right power battery pack 4 and a left power battery pack 6. The left power battery pack 6 is in two boxes and is arranged on the left side of the frame and behind the hydrogen fuel cell engine 1 7; the right power battery pack 4 is in two boxes and is arranged on the right side of the frame and behind the hydrogen fuel cell engine 2 10; the right power battery pack 4 and the left power battery pack 6 are both arranged longitudinally, and the top of the right power battery pack 4 and the left power battery pack 6 do not exceed the upper wing surface of the frame; the right power battery pack 4 and the left power battery pack 6 are respectively fixed on the power battery bracket 25. The power batteries are arranged behind the fuel cell and on both sides of the frame, with a modular design, easy installation, and better strength.

[0026] When the electric drive system 5 is in an electric drive axle configuration, the electric drive axle is an integrated drive axle, a speed change mechanism, and a motor; when the electric drive system 5 is in a central drive configuration, the motor and the gearbox are arranged on the inner side of the middle section of the frame, under the hydrogen storage system, and the motor and the gearbox are connected to the drive axle through a traditional shaft; this structure is easy to assemble and maintain on the whole vehicle, has good versatility, and high adaptability.

[0027] The fuel cell heat dissipation module includes two independent fuel cell heat dissipation modules 2 and 18, which are arranged above the hydrogen storage system and connected by pipelines. Each module is integrated with a multi-fan distribution box for dissipating power to the fans; the fuel cell heat dissipation module 18 dissipates heat for the hydrogen fuel cell engine 17, and the fuel cell heat dissipation module 22 dissipates heat for the hydrogen fuel cell engine 10; the heat dissipation system can be a high-pressure fan or a low-pressure fan.

[0028] The integrated control module 9 includes an all-in-one controller, an electric steering pump, a two-in-one air conditioner, a low-voltage battery, a BMS, and an integrated control module bracket. It is arranged under the cab, has good waterproofness, modular design, high integration, good accessibility, and convenient maintenance. The all-in-one controller integrates two fuel cell power distribution, two power battery power distribution, DCDC and MCU; the DCDC system is arranged on the front facade of the hydrogen storage system, has good heat dissipation effect, is easy to assemble, easy to maintain, and easy to connect the wiring harness.

[0029] The fuel cell cooling pipeline includes a fuel cell cooling pipeline 15 and a fuel cell cooling pipeline 2 14. The fuel cell cooling pipeline 15 is connected downward from the fuel cell heat dissipation module 1 8 to the hydrogen fuel cell engine 1 7, and the middle section is fixed on the left front facade of the hydrogen storage system 3; the fuel cell cooling pipeline 2 14 is connected downward from the fuel cell heat dissipation module 2 2 to the hydrogen fuel cell engine 2 10, and the middle section is fixed on the right front facade of the hydrogen storage system 3.

[0030] The fuel cell air filter 1 includes a right fuel cell air filter 12 and a left fuel cell air filter 13. The right fuel cell air filter 12 is arranged behind an axle, on the fender bracket, and on the right side. The left fuel cell air filter 13 is arranged behind an axle, on the fender bracket, and on the left side, and is used for fine filtration and chemical filtration of the fuel cell engine intake air; the fuel cell air filter 2 includes a right fuel cell air filter 16 and a left fuel cell air filter 17, which are arranged on the front facade of the hydrogen storage system 3, one on each side, and are used for coarse filtration of the fuel cell engine intake air; the fuel cell intake air filters are arranged one above and one below, respectively, on the hydrogen storage system and the rear fender bracket, with efficient space utilization, convenient maintenance, high-altitude air intake, and high cleanliness; bipolar filtration effectively purifies the air.

[0031] The high-voltage wiring harness 18 is a wiring harness from the all-in-one controller to each high-voltage component. The middle wiring harness of the frame is arranged on the frame and fixed by special pipe clamps and wiring harness brackets. Through orderly separation, the wiring harness is ensured to be reasonable and beautiful, and the occurrence of electromagnetic interference is reduced.

[0032] The present invention solves the problem that the dual hydrogen fuel cell engine is difficult to inspect and maintain after arrangement. The dual hydrogen fuel cell system is arranged behind one axle and on the left and right sides of the frame, does not occupy the space of the hydrogen storage system, has good side accessibility, and is convenient for installation and maintenance; an integrated control module is arranged under the cab to integrate multiple components, thereby reducing the number of wiring harnesses and avoiding electromagnetic interference and maintenance difficulties caused by crossing, overlapping, and confusion of the wiring harnesses; the heat dissipation of the fuel cell system stack is arranged on the upper part of the hydrogen storage system, and the relevant pipelines are directly connected to the fuel cell from the left and right sides downward without crossing, with a more reasonable direction and more convenient arrangement; the dual fuel cell system, high-voltage battery pack, hydrogen storage system, integrated control system, fuel cell heat dissipation module, fuel cell air intake system, electric drive system, charging port, high and low voltage wiring harness directions, etc. are arranged in a modular manner to reduce repeated design and improve versatility.

[0033] The arrangement of the components of the present invention is appropriate and reasonable, with a compact structure, and full consideration is given to the arrangement of high and low pressure separation, waterways, lines, gasways, etc.; it takes into account the fuel cell systems of different manufacturers, the central drive configuration and the electric drive axle configuration, and the high-voltage batteries commonly used in hydrogen fuel in the market; it fully considers modularization and installation and maintenance convenience; net zero emissions and dual carbon needs. The present invention uses a reasonable layout and symmetrical placement of the hydrogen fuel cell system and its heat dissipation system and power battery system, so that the direction of the pipeline harness is smoother, the components are more convenient to repair, the modularization, generalization, and integration of the vehicle are significantly improved, and it is more convenient to produce, debug, and repair.

[0034] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A chassis layout structure of a dual hydrogen fuel cell system tractor, characterized in that: The vehicle comprises a hydrogen fuel cell engine 1 (7), a hydrogen fuel cell engine 2 (10), a power battery pack, an integrated control module (9), an electric drive system (5), a hydrogen storage system (3), a fuel cell heat dissipation module, a fuel cell cooling pipeline, a high-voltage wiring harness (18), a charging port, a fuel cell air filter 1, a fuel cell air filter 2, a power battery bracket (25), a left frame (19) and a right frame (28); the power battery bracket (25) is connected to the frame through a transition bracket, and a crossbeam 1 (26) and a crossbeam 2 (27) are correspondingly arranged at the connection point; the power battery pack is fixed on the power battery bracket (25); the hydrogen fuel cell engine 1 (7) and the hydrogen fuel cell engine 2 (10) are respectively arranged behind an axle and on the left and right sides of the frame; The power battery pack comprises four boxes in total, which are arranged in two groups behind the fuel cell and on the left and right sides of the vehicle frame; the integrated control module (9) is fixed below the cab (1); the electric drive system (5) is of an electric drive axle configuration or a central drive configuration; the hydrogen storage system (3) is arranged behind the cab (1) and above the vehicle frame; the fuel cell heat dissipation module is arranged behind the cab (1) and above the hydrogen storage system (3); the fuel cell cooling pipeline is connected to the fuel cell system from the fuel cell heat dissipation module downward; the charging port is a single charging port, which is arranged on the left or right side of the vehicle behind one axle, and a movable protective cover is provided on the charging port; the fuel cell air filter 1 is arranged behind one axle and on the fender bracket; the fuel cell air filter 2 is arranged on the front facade of the hydrogen storage system (3).

2. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: It also includes an outrigger (20), a bracket one (21), a bracket two (22), a bracket three (23) and a bracket four (24), the outriggers (20) are arranged on the outside of the left frame (19) and the right frame (28), the two brackets three (23) are directly connected to the frame, the bracket two (22) and the bracket four (24) are fixed on the connecting beam between the outrigger (20) and the power battery bracket (25); the cooling interface and the intake and exhaust interface of the hydrogen fuel cell engine one (7) and the hydrogen fuel cell engine two (10) face forward, and are respectively connected to the bracket two (22), the bracket three (23) and the bracket four (24) through four-point or eight-point suspension.

3. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: The hydrogen storage system (3) is composed of a plurality of gas cylinders placed horizontally or vertically, arranged above the vehicle frame and behind the cab, and has a working pressure of 35 MPa or 70 MPa.

4. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: The power battery pack comprises a right power battery pack (4) and a left power battery pack (6); the left power battery pack (6) comprises two boxes and is arranged on the left side of the vehicle frame and behind the first hydrogen fuel cell engine (7); the right power battery pack (4) comprises two boxes and is arranged on the right side of the vehicle frame and behind the second hydrogen fuel cell engine (10); the right power battery pack (4) and the left power battery pack (6) are both arranged longitudinally, and their topmost parts do not exceed the upper wing surface of the vehicle frame.

5. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: When the electric drive system (5) is in an electric drive axle configuration, the electric drive axle is an integrated drive axle, a speed change mechanism, and a motor; when the electric drive system (5) is in a central drive configuration, the motor and the gearbox are arranged on the inner side of the middle section of the frame and under the hydrogen storage system (3), and the motor and the gearbox are connected to the drive axle via a traditional shaft.

6. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: The fuel cell heat dissipation module comprises two independent fuel cell heat dissipation modules 2 (2) and a fuel cell heat dissipation module 1 (8), each module is integrated with a multi-fan power distribution box for distributing power to the fans; the fuel cell heat dissipation module 1 (8) dissipates heat for the hydrogen fuel cell engine 1 (7), and the fuel cell heat dissipation module 2 (2) dissipates heat for the hydrogen fuel cell engine 2 (10).

7. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: The integrated control module (9) comprises an all-in-one controller, an electric steering pump, a two-in-one air conditioner, a low-voltage battery, a BMS, and an integrated control module bracket, wherein the all-in-one controller integrates two fuel cell power distributions, two power battery power distributions, a DCDC, and an MCU.

8. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: The fuel cell cooling pipeline comprises a fuel cell cooling pipeline 1 (15) and a fuel cell cooling pipeline 2 (14); the fuel cell cooling pipeline 1 (15) is connected downwardly from the fuel cell heat dissipation module 1 (8) to the hydrogen fuel cell engine 1 (7), and the middle section is fixed on the left front facade of the hydrogen storage system (3); the fuel cell cooling pipeline 2 (14) is connected downwardly from the fuel cell heat dissipation module 2 (2) to the hydrogen fuel cell engine 2 (10), and the middle section is fixed on the right front facade of the hydrogen storage system (3).

9. The dual hydrogen fuel cell system tractor chassis layout structure according to claim 1, characterized in that: The fuel cell air filter 1 includes a right fuel cell air filter 1 (12) and a left fuel cell air filter 1 (13). The right fuel cell air filter 1 (12) is arranged behind an axle, on a fender bracket, and located on the right side. The left fuel cell air filter 1 (13) is arranged behind an axle, on a fender bracket, and located on the left side. It is used for fine filtration and chemical filtration of the fuel cell engine intake air. The fuel cell air filter 2 includes a right fuel cell air filter 2 (16) and a left fuel cell air filter 2 (17). They are arranged on the front facade of the hydrogen storage system (3), one on each side, and are used for coarse filtration of the fuel cell engine intake air.

10. The dual hydrogen fuel cell system tractor chassis arrangement structure according to any one of claims 1 to 9, characterized in that: The high-voltage wire harness (18) is a wire harness from the all-in-one controller to each high-voltage component, and the frame intermediate wire harness is arranged on the frame.

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