Fuel tank mounting structure and construction machinery

Abstract

The present invention discloses a fuel tank mounting structure and engineering machinery, the fuel tank mounting structure comprises a radiator, an engine and a fuel tank, the fuel tank is spaced apart on the lateral side of the engine and is offset downward relative to the engine, the radiator is arranged below the engine and extends laterally toward a downward offset portion of the fuel tank, a lateral avoidance space for the radiator end to extend laterally is formed on one side of the downward offset portion toward the engine, the top wall of the lateral avoidance space is formed as an inclined guide side wall for guiding part of the heat dissipation airflow passing through the radiator end from bottom to top to the side of the engine, the fuel tank mounting structure has a simple scheme and improves the heat dissipation efficiency of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a fuel tank mounting structure and engineering machinery. Background Art

[0002] The power compartment of existing engineering machinery (such as walking excavators and ordinary excavators) includes an engine and a radiator, wherein the radiator is arranged directly below the engine, and the heat generated by the engine when working is exchanged through the radiator, and the radiator then blows the exchanged heat upward to the bottom of the engine in the form of a heat dissipation airflow to further take away the heat from the bottom surface of the engine. Since the temperature of the heat dissipation airflow is relatively high, in order to prevent the heat dissipation airflow from damaging the cab or other components of the engineering machinery, a partition layer and / or a frame system needs to be set to seal the power compartment, which makes the structure of the engineering machinery more complicated and increases the time and labor costs in the manufacturing process. Summary of the invention

[0003] The purpose of the present invention is to provide a fuel tank mounting structure and an engineering machine, which have simple solutions, improve the heat dissipation efficiency of the engine, are conducive to simplifying the structure of the engineering machine and reducing the time cost and labor cost in the manufacturing process.

[0004] In order to achieve the above-mentioned purpose, a first aspect of the present invention provides a fuel tank mounting structure, which includes a radiator, an engine and a fuel tank, the fuel tank being spaced apart on the lateral side of the engine and offset downward relative to the engine, the radiator being arranged below the engine and extending laterally toward the downward offset portion of the fuel tank, a lateral avoidance space for the radiator end to extend laterally is formed on the side of the downward offset portion facing the engine, and a top wall of the lateral avoidance space is formed as an inclined guide side wall for guiding part of the heat dissipation airflow passing through the radiator end from bottom to top to the side of the engine.

[0005] In an embodiment of the present invention, the fuel tank includes an upper box body connected to each other and a lower box body serving as a downward offset portion, the avoidance space is located on a side of the lower box body facing the engine and below a side of the upper box body facing the engine, and an inclined guide side wall is formed on the upper box body.

[0006] In an embodiment of the present invention, an inclined refueling port is further provided on one side wall of the upper box body.

[0007] In an embodiment of the present invention, the fuel tank further comprises a refueling assembly which is arranged on a side wall of the fuel tank and is used for refueling the fuel tank.

[0008] In an embodiment of the present invention, the refueling assembly includes a refueling pipe and a refueling pump arranged on the refueling pipe, the first end of the refueling pipe is used to connect to the external fuel tank, and the second end of the refueling pipe is connected to the inner cavity of the fuel tank.

[0009] In an embodiment of the present invention, a bent pipe connected to the inner cavity extends from the side wall of the fuel tank, and the second end of the refueling pipe is detachably connected to the bent pipe through the first joint assembly.

[0010] In an embodiment of the present invention, a fixing piece for fixing the refueling pipe is further provided on the side wall of the fuel tank, and the first end of the refueling pipe is detachably connected to the fixing piece via the second joint assembly.

[0011] In an embodiment of the present invention, the fuel tank further comprises a mounting base arranged at the bottom of the lower tank body, and an oil suction pan mounting flange for cooperating with the oil suction pan is provided on the mounting base.

[0012] In an embodiment of the present invention, the fuel tank further comprises a filter assembly which is arranged on a side wall of the fuel tank and is used for providing the engine with fuel after filtering out impurities.

[0013] In an embodiment of the present invention, the filter assembly includes a filter, a fuel cut-off valve and a connecting pipe, the filter is arranged on the side wall of the fuel tank, the upper end of the connecting pipe is connected to the filter, the lower end of the connecting pipe is connected to the oil suction plate, and the fuel cut-off valve is arranged on the connecting pipe and is located at the upstream end of the filter.

[0014] In an embodiment of the present invention, the fuel tank further includes an accessory mounting assembly for mounting external accessories.

[0015] In an embodiment of the present invention, the accessory mounting assembly includes a reinforcing bottom plate disposed on a side wall of the fuel tank and a threaded mounting seat disposed outside the reinforcing bottom plate.

[0016] A second aspect of the present invention provides an engineering machine, the engineering machine comprising the above-mentioned fuel tank mounting structure.

[0017] Through the above technical solution, a radiator, an engine and a fuel tank are provided. The fuel tank is located on the lateral side of the engine and is offset downward relative to the engine. The radiator is located below the engine. A lateral avoidance space is provided on the fuel tank for the radiator end to extend laterally. The top wall of the lateral avoidance space is formed with an inclined guide side wall to guide part of the heat dissipation airflow passing through the radiator end from bottom to top to the side of the engine. The fuel tank installation structure is simple, improves the heat dissipation efficiency of the engine, is conducive to simplifying the structure of engineering machinery and reducing the time cost and labor cost in the manufacturing process.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 is a schematic diagram of the components of the fuel tank installation structure in an embodiment of the present invention;

[0021] Figure 2 : is a schematic diagram of the structure of the fuel tank from the first perspective in an embodiment of the present invention (there is only one reinforced bottom plate);

[0022] Figure 3 is a schematic structural diagram of a fuel tank from a second viewing angle in an embodiment of the present invention;

[0023] Figure 4 : is a schematic diagram of the structure of the fuel tank from the third perspective in an embodiment of the present invention (there is only one reinforced bottom plate);

[0024] Figure 5 : is a schematic diagram of the structure of the fuel tank from the fourth perspective in an embodiment of the present invention (there are multiple reinforced bottom plates);

[0025] Figure 6 Schematic diagram of a fuel tank after installation in an embodiment of the present invention.

[0026] Description of Reference Numerals

[0027] DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0029] The embodiment of the present invention provides a new type of fuel tank installation structure, which is suitable for engineering machinery. Furthermore, the engineering machinery in this embodiment includes a walking excavator, a common medium-sized excavator, a common small excavator or a common mini excavator. Figure 1As shown, the fuel tank installation structure includes a radiator 1, an engine 2 and a fuel tank. The radiator 1, the engine 2 and the fuel tank are all arranged in the power compartment of the engineering machinery. Specifically, the engine 2 is used to provide power for the driving and / or operation of the engineering machinery. The engine 2 emits a large amount of heat when working. The fuel tank stores fuel, and the above fuel can be transported to the engine 2. The fuel tank is arranged at a lateral side of the engine 2 and is offset downward relative to the engine 2, that is, there is a certain gap between the engine 2 and the fuel tank in the lateral direction, and the fuel tank does not completely block the engine 2 in the vertical direction, which is beneficial to the engine 2. The radiator 1 is arranged below the engine 2 and extends laterally toward the downward offset portion of the fuel tank, and a lateral avoidance space is formed on the side of the downward offset portion facing the engine 2 for the end of the radiator 1 to extend laterally, wherein the radiator 1 can emit a heat dissipation airflow from bottom to top, and when the heat dissipation airflow moves upward and contacts the engine 2, it can take away the heat generated by the engine 2, so that the engine 2 maintains a stable working state; further, the fuel tank is formed with a downward offset portion on the side facing the engine 2, and the downward offset portion is formed with a lateral avoidance space on the side facing the engine 2. The radiator 1 in this embodiment is The radiator 1 is offset with the engine 2 in the horizontal direction, and the end of one end of the radiator 1 extends into the horizontal avoidance space, that is, a part of the heat dissipation airflow emitted by the radiator 1 is directly blown upward to the bottom of the engine 2 to help cool the bottom of the engine 2, and the other part is blown into the horizontal avoidance space of the fuel tank; the top wall of the horizontal avoidance space is formed as an inclined guide side wall for guiding part of the heat dissipation airflow passing through the end of the radiator 1 from bottom to top to the side of the engine 2, that is, the side wall of the fuel tank above the horizontal avoidance space is inclined, and the inclined side wall is the inclined guide side wall, so that the radiator 1 blows upward in the horizontal avoidance space. The heat dissipation airflow changes its original direction of movement after contacting the inclined guide side wall, and continues to move forward along the extension direction of the inclined guide side wall. The heat dissipation airflow changes its original direction of movement after contacting the inclined guide side wall, and continues to move forward along the extension direction of the inclined guide side wall. The heat dissipation airflow blows toward the side of the engine 2 after changing its direction of movement, and then contacts the side of the engine 2 and takes away the heat emitted from the side of the engine 2. The fuel tank installation structure in this embodiment is simple, which improves the heat dissipation efficiency of the engine 2. There is no need to set up additional partitions and / or frames at the fuel tank position in the power compartment to block the heat dissipation airflow with higher temperature, which is conducive to simplifying the structure of engineering machinery and reducing the time and labor costs in the manufacturing process.

[0030] In one embodiment of the present invention, a heat insulating layer is provided on the outer wall of the fuel tank. Furthermore, the heat insulating layer is a heat insulating sponge to prevent the heat dissipation airflow from causing adverse effects on the fuel tank and enhance the safety performance of the fuel tank.

[0031] In one embodiment of the present invention, Figure 2-6As shown, the fuel tank includes an upper box body 3 and a lower box body 4 which are interconnected and serve as a downward offset portion. The avoidance space is located on the side of the lower box body 4 facing the engine 2 and below the side of the upper box body 3 facing the engine 2. An inclined guide side wall 301 is formed on the upper box body 3. In the case of a fixed platform installation area, various components are arranged on the platform of the existing engineering machinery fuel tank installation structure, so that a large area of ​​the platform is occupied, and the space utilization rate of the upper part is insufficient, which makes the installation space of the fuel tank limited. Therefore, in order to effectively utilize the space and extend the life of the entire engineering equipment, the size and shape of the fuel tank in this embodiment are adapted to the installation space of the fuel tank in the fuel tank installation structure (the installation space of the fuel tank in this embodiment refers to the space remaining after the fuel tank installation structure has been installed with other components other than the fuel tank), that is, the fuel tank includes an upper box body 3 and a lower box body 4, the upper box body 3 is arranged above the lower box body 4, the accommodation space of the upper box body 3 is larger than the accommodation space of the lower box body 4, and the accommodation spaces of the two are interconnected, and a part of the lower part of the upper box body 3 is suspended, and the suspended position can be used to install other components of the engineering machinery and avoid interference with the fuel tank (such as Figure 6 As shown in the figure, the structure of this fuel tank is irregular, the bottom volume is small so that it occupies a smaller installation space, and the upper volume is large so that the fuel tank can store more fuel to enhance the overall endurance of the engineering machinery, thereby improving the space utilization rate in the fuel tank installation structure. In addition, the avoidance space in this embodiment is formed by the side of the lower box body 4 facing the engine 2 and the lower part of the side of the upper box body 3 facing the engine 2. The side of the upper box body 3 facing the engine 2 is formed with an inclined inclined guide side wall 301. The heat dissipation airflow blown out from the end of the radiator 1 moves upward and moves toward the side of the engine 2 under the guidance of the inclined guide side wall 301 to take away the heat emitted from the side of the engine 2.

[0032] In one embodiment of the present invention, an inclined refueling port 5 is further provided on one side wall of the upper tank body 3. In the prior art, the refueling port of the fuel tank is generally vertically arranged on the top of the fuel tank, but in this embodiment, Figure 2-5 As shown, one side of the upper box body 3 is further provided with an inclined side wall between its top horizontal wall and the vertical side wall, and an inclined refueling port 5 is provided on the inclined side wall, so that the staff can refuel the fuel tank through the inclined refueling port 5 from the side, without having to remove other components above the fuel tank to expose the refueling port and the space around it for refueling as in the prior art. The design of the refueling port 5 in this embodiment improves the convenience of refueling and reduces the maintenance time of the fuel tank.

[0033] In one embodiment of the present invention, the fuel tank also includes a refueling assembly 6 arranged on the side wall of the fuel tank and used to refuel the fuel tank, so that the fuel tank can be refueled more quickly and conveniently through the refueling assembly 6 without the need for a staff member to manually pour the fuel into the fuel tank through the refueling port 5, further enhancing the convenience of refueling the fuel tank, reducing the difficulty of refueling the fuel tank, and shortening the time spent on refueling.

[0034] In one embodiment of the present invention, the refueling assembly 6 includes a refueling pipeline 601 and a refueling pump 602 disposed on the refueling pipeline 601, wherein the first end of the refueling pipeline 601 is used to connect to an external fuel tank, and the second end of the refueling pipeline 601 is connected to the inner cavity of the fuel tank. Specifically, the refueling pump 602 is disposed on the side wall of the fuel tank, and the refueling pipeline 601 includes a first branch channel and a second branch channel, wherein the first end of the first branch channel is connected to the external fuel tank storing fuel, and the second end of the first branch channel is connected to the fuel inlet of the refueling pump 602; the first end of the second branch channel is connected to the fuel outlet of the refueling pump 602, and the second end of the second branch channel is connected to the inner cavity of the fuel tank, wherein the connection position between the second end of the second branch channel and the inner cavity of the fuel tank is located on the upper box body 3. When it is necessary to refuel the fuel tank through the refueling assembly 6, the first end of the first branch channel is extended into the external fuel tank and the refueling pump 602 is turned on. The fuel in the external fuel tank will pass through the first branch channel, the refueling pump 602 and the second branch channel in sequence under the suction action of the refueling pump 602 and enter the inner cavity of the fuel tank, thereby improving the refueling efficiency of the fuel tank.

[0035] In one embodiment of the present invention, a bending pipe 7 connected to the inner cavity extends from the side wall of the fuel tank, and the second end of the refueling pipeline 601 is detachably connected to the bending pipe 7 through the first joint assembly 8. Specifically, the bending pipe 7 extends from the side wall of the upper box body 3 of the fuel tank, and the first joint assembly 8 includes a first male joint and a first female joint that are detachably connected. The first male joint is arranged at one end of the bending pipe 7 away from the fuel tank, and the first female joint is arranged at the second end of the second branch channel. When the fuel tank needs to be refueled, the first male joint and the first female joint are connected together, the first end of the first branch channel is extended into the external fuel tank, and the refueling pump 602 is turned on. Further, if other components or other external equipment need to be refueled but there is no pipeline or refueling pump 602 for refueling, the first male joint and the first female joint can be disassembled, and then the first end of the first branch channel is extended into the external fuel tank, and then the second end of the second branch channel is placed in the fuel container of other components or other external equipment and the refueling pump 602 is turned on, and other components or other external equipment can be refueled through the refueling assembly 6 on the fuel tank.

[0036] In one embodiment of the present invention, a fixing member 9 for fixing the refueling pipe 601 is also provided on the side wall of the fuel tank, and the first end of the refueling pipe 601 is detachably connected to the fixing member 9 through the second joint assembly 10. Specifically, the fixing member 9 in this embodiment is a fixing frame arranged on the side wall of the fuel tank, and the second joint assembly 10 includes a second male joint and a second female joint, the second male joint is arranged on the fixing frame, and the second female joint is arranged at the first end of the first branch channel. When the refueling assembly 6 is not needed for refueling, the second male joint and the second female joint are connected together to prevent the first branch channel from moving at will and causing accidental damage to it (when the first male joint and the first female joint are connected together, the second branch channel can also be prevented from moving at will); when the refueling assembly 6 is needed for refueling, the second male joint and the second female joint are disassembled and the first branch channel is connected to the external fuel tank.

[0037] The fuel tank in the prior art generally adopts two or more separate mounting bases and a separately welded oil suction pan mounting flange. However, when the available mounting area at the bottom of the fuel tank is small, the fuel tank mounting base and the oil suction pan mounting flange need to ensure a sufficiently large gap for respective welding. This requires reducing the area of ​​the fuel tank mounting base and the oil suction pan mounting flange, which will lead to the problem of insufficient strength at the bottom of the fuel tank, a small oil suction pan mounting flange, and inability to clean the inside of the fuel tank through this area. To solve the above problems, in one embodiment of the present invention, the fuel tank further includes a mounting base 11 arranged at the bottom of the lower tank body 4, and an oil suction pan mounting flange 13 for cooperating with the oil suction pan 12 is provided on the mounting base 11. Specifically, the fuel tank includes a mounting base 11 and an oil suction pan 12. The mounting base 11 is welded to the bottom of the lower box body 4. The mounting base 11 is provided with an oil suction pan mounting flange 13 for cooperating with the oil suction pan 12. That is, in this embodiment, the mounting base 11 and the oil suction pan mounting flange 13 are integrated into one. This structural design can not only enhance the bottom structural strength of the fuel tank, but also avoid the problem of installation space conflict between the fuel tank mounting base 11 and the oil suction pan mounting flange 13 when the bottom area of ​​the fuel tank is small.

[0038] In one embodiment of the present invention, the fuel tank also includes a filter assembly 14 arranged on the side wall of the fuel tank and used to provide the engine 2 with fuel after filtering out impurities, so that the filter assembly 14 and the fuel tank body are integrated together, further enhancing the integration level of the fuel tank and facilitating the modularization of the fuel tank installation structure.

[0039] In the fuel tank installation structure of the prior art, the filter 1401 and the oil cut-off valve 1402 are generally located in the fuel pipeline, which makes the pipeline connection complicated and the integration of the fuel tank installation structure is low. In one embodiment of the present invention, the filter assembly 14 includes a filter 1401, an oil cut-off valve 1402 and a connecting pipe 1403. The filter 1401 is arranged on the side wall of the fuel tank, the upper end of the connecting pipe 1403 is connected to the filter 1401, and the lower end of the connecting pipe 1403 is connected to the oil suction plate 12. The oil cut-off valve 1402 is arranged on the connecting pipe 1403 and is located at the upstream end of the filter 1401. The filter 1401 is used to filter out impurities in the fuel, and the number of filters 1401 can be one or more; the oil cut-off valve 1402 is used to block the fuel in the connecting pipe 1403 from flowing to the engine 2 In order to realize the flow of fuel, the connecting pipe 1403 in this embodiment is arranged close to the side wall of the fuel tank. When it is necessary to deliver fuel to the engine 2, the oil cut-off valve 1402 is controlled to be in a closed state, so that the fuel in the fuel tank passes through the oil suction plate 12 in turn and enters the connecting pipe 1403, and then flows into the engine 2 after being filtered by the filter 1401. This structural design allows only one connecting pipe 1403 to be used between the fuel tank and the engine 2 to realize the delivery of fuel, reduces the number of connecting pipes 1403 between the oil suction plate 12 and the engine 2, increases the integration of the fuel tank installation structure, and is conducive to the modularization of the fuel tank installation structure. Furthermore, the connecting pipe 1403 in this embodiment can also be provided with an oil-water separator, and / or an electronic oil pump, and / or a one-way valve according to actual needs.

[0040] In one embodiment of the present invention, the fuel tank also includes an accessory mounting assembly 15 for mounting external accessories (such as a filter 1401). The accessory mounting assembly 15 is disposed on the side wall of the fuel tank so that the accessories to be mounted are also located on the side wall of the fuel tank, thereby effectively utilizing the space of the fuel tank mounting structure.

[0041] In one embodiment of the present invention, the accessory mounting assembly 15 includes a reinforcing bottom plate 1501 disposed on the side wall of the fuel tank and a threaded mounting seat 1502 disposed outside the reinforcing bottom plate 1501. Specifically, the threaded mounting seat 1502 is provided with a plurality of threaded holes for connecting external accessories, and the thickness of the threaded mounting seat 1502 is greater than the length of the bolts screwed into the threaded holes. Since this will cause the threaded mounting seat 1502 to be thicker, in order to avoid the threaded mounting seat 1502 being too heavy, the area of ​​the threaded mounting seat 1502 needs to be set within an appropriate range to avoid the side wall of the fuel tank from cracking when the heavy external accessories are mounted; further, in this embodiment, the thickness of the reinforcing bottom plate 1501 is relatively small (the thickness of the reinforcing bottom plate 1501 ranges from 4mm to 8mm), and the reinforcing bottom plate is provided with a through hole corresponding to the position of the threaded hole on the threaded mounting seat 1502, and the through hole can be used as a positioning hole of the threaded mounting seat 1502 to ensure the installation accuracy of the threaded mounting seat 1502. In addition, in this embodiment, the number of the reinforcing base plates 1501 can correspond to the number of the threaded mounting seats 1502. Figure 5 As shown, the area of ​​the reinforcing bottom plate 1501 is relatively small; or Figure 4 As shown, the number of the reinforcing bottom plate 1501 may also be one. In this case, the area of ​​the reinforcing bottom plate 1501 is larger, so that a plurality of threaded mounting seats 1502 are arranged at intervals on its outer side.

[0042] In one embodiment of the present invention, Figure 3 As shown, the fuel tank further includes a reinforcing plate 16 which is arranged in the upper tank body 3 and / or the lower tank body 4 and is used to enhance the internal structural strength of the fuel tank.

[0043] Another embodiment of the present invention provides an engineering machine, which includes the above-mentioned fuel tank mounting structure.

[0044] The present invention provides a fuel tank mounting structure and engineering machinery. A radiator, an engine and a fuel tank are arranged. The fuel tank is located on the lateral side of the engine and is offset downward relative to the engine. The radiator is located below the engine. A lateral avoidance space is provided on the fuel tank for the radiator end to extend laterally. The top wall of the lateral avoidance space is formed with an inclined guide side wall to guide part of the heat dissipation airflow passing through the radiator end from bottom to top to the side of the engine. The fuel tank mounting structure has a simple scheme, improves the heat dissipation efficiency of the engine, is conducive to simplifying the structure of the engineering machinery and reducing the time cost and labor cost in the manufacturing process.

[0045] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any appropriate manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fuel tank installation structure, characterized in that: The fuel tank mounting structure comprises a radiator (1), an engine (2) and a fuel tank, wherein the fuel tank is arranged at intervals on the lateral side of the engine (2) and is offset downward relative to the engine (2), the radiator (1) is arranged below the engine (2) and extends laterally toward the downward offset portion of the fuel tank, a lateral avoidance space is formed on the side of the downward offset portion facing the engine (2) for the end of the radiator (1) to extend laterally, the top wall of the lateral avoidance space is formed as an inclined guide side wall (301) for guiding part of the heat dissipation airflow passing through the end of the radiator (1) from bottom to top to the side of the engine (2), and the fuel tank comprises an upper box body (3) and a lower box body (4) as the downward offset portion which are connected to each other, and the accommodation space of the upper box body (3) is larger than the accommodation space of the lower box body (4).

2. The fuel tank installation structure according to claim 1, characterized in that: The avoidance space is located below a side of the lower box body (4) facing the engine (2) and a side of the upper box body (3) facing the engine (2), and the inclined flow guide side wall (301) is formed on the upper box body (3).

3. The fuel tank installation structure according to claim 2, characterized in that: An inclined refueling port (5) is also provided on one side wall of the upper box body (3).

4. The fuel tank installation structure according to claim 1, characterized in that: The fuel tank further comprises a refueling assembly (6) which is arranged on a side wall of the fuel tank and is used for refueling the fuel tank.

5. The fuel tank installation structure according to claim 4, characterized in that: The refueling assembly (6) comprises a refueling pipeline (601) and a refueling pump (602) arranged on the refueling pipeline (601); a first end of the refueling pipeline (601) is used to be connected to an external fuel tank, and a second end of the refueling pipeline (601) is connected to the inner cavity of the fuel tank.

6. The fuel tank installation structure according to claim 5, characterized in that: A bent pipe (7) connected to the inner cavity extends from the side wall of the fuel tank, and the second end of the refueling pipe (601) is detachably connected to the bent pipe (7) via a first joint assembly (8).

7. The fuel tank installation structure according to claim 6, characterized in that: A fixing member (9) for fixing the refueling pipe (601) is also provided on the side wall of the fuel tank, and the first end of the refueling pipe (601) is detachably connected to the fixing member (9) via a second joint assembly (10).

8. The fuel tank installation structure according to claim 2, characterized in that: The fuel tank further comprises a mounting base (11) arranged at the bottom of the lower tank body (4), and an oil suction plate mounting flange (13) for cooperating with the oil suction plate (12) is provided on the mounting base (11).

9. The fuel tank installation structure according to claim 8, characterized in that: The fuel tank further comprises a filter assembly (14) arranged on a side wall of the fuel tank and used for providing the engine (2) with fuel after filtering out impurities.

10. The fuel tank installation structure according to claim 9, characterized in that: The filter assembly (14) comprises a filter (1401), an oil cut-off valve (1402) and a connecting pipe (1403); the filter (1401) is arranged on the side wall of the fuel tank; the upper end of the connecting pipe (1403) is connected to the filter (1401); the lower end of the connecting pipe (1403) is connected to the oil suction plate (12); and the oil cut-off valve (1402) is arranged on the connecting pipe (1403) and is located at the upstream end of the filter (1401).

11. The fuel tank installation structure according to any one of claims 1 to 10, characterized in that: The fuel tank also includes an accessory mounting assembly (15) for mounting external accessories.

12. The fuel tank installation structure according to claim 11, characterized in that: The accessory mounting assembly (15) comprises a reinforcing bottom plate (1501) arranged on the side wall of the fuel tank and a threaded mounting seat (1502) arranged outside the reinforcing bottom plate (1501).

13. An engineering machine, characterized in that: The engineering machinery comprises a fuel tank mounting structure according to any one of claims 1-12.

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