Rear-mounted fuel tank of tractor

Abstract

The utility model relates to the technical field of fuel tanks, in particular to a rear-mounted fuel tank of a tractor, which comprises a tank body fixed on the back of a backrest of a seat of the tractor, one side of the tank body close to the seat is provided with a first extension portion extending along the direction far away from the tank body, and the first extension portion is communicated with the tank body. The volume of the fuel tank is increased through transverse extension, and the possibility that the bottom of the fuel tank is damaged is reduced. The fuel tank is installed behind the backrest, located on the rear portion of the tractor and far away from a front area which is prone to colliding with other objects or the ground, and the risk that the fuel tank is subjected to external impact is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel tanks, in particular to a tractor rear-mounted fuel tank. Background Art

[0002] The tractor fuel tank is a key component for storing diesel in the tractor. To ensure the endurance of the tractor, the volume of the fuel tank must meet the needs of users. Most existing tractor fuel tanks are arranged under the instrument panel or under the cab. Due to the narrow internal space, most tractor fuel tanks are designed with special-shaped structures, and the fuel tank is close to the engine, front and rear tires, gearbox and cab floor.

[0003] To meet the volume requirements of the fuel tank, the fuel tank can only extend downward. Tractors are mostly used in fields and mountains, where the operating conditions are relatively complex. The bottom of the fuel tank is easily worn or scratched by stones or heavy objects, causing irreversible deformation of the fuel tank. In severe cases, the tank may leak or be directly scrapped. Even if a guard plate is added to the bottom of the fuel tank to protect it, the ability to cope with complex terrain is poor. If it encounters a heavy object impact, the bottom of the fuel tank may still be damaged. Utility Model Content

[0004] In order to meet the volume requirement of the fuel tank and reduce the possibility of damage to the bottom of the fuel tank, the present application provides a tractor rear-mounted fuel tank.

[0005] The present application provides a tractor rear-mounted fuel tank, comprising a tank body fixed behind a seat back of the tractor, wherein a first extension portion extending in a direction away from the tank body is provided on a side of the tank body close to the seat, and the first extension portion is connected to the tank body.

[0006] The utility model has the following beneficial effects: the provision of the transversely extending first extension portion increases the capacity of the fuel tank and reduces the possibility of damage to the bottom of the fuel tank. The fuel tank is installed behind the seat back of the tractor, so that the fuel tank is located at the rear of the tractor, away from the front area that is prone to collision with other objects or the ground, reducing the risk of the fuel tank being subjected to external impact.

[0007] Furthermore, a second extension portion is provided at the lower left side of the box body, the second extension portion extends in a direction close to the ground, the second extension portion is respectively connected to the box body and the first extension portion, and an oil drain port is provided on the lower surface of the second extension portion.

[0008] The beneficial effect of adopting the above further solution is that the oil drain port is located at the lowest point of the entire box body, and impurities and residual oil in the box body can be cleaned through the oil drain port.

[0009] Furthermore, an oil suction port is provided on the left side of the second extension portion, and the oil suction port is a concave boss structure.

[0010] The beneficial effect of adopting the above further solution is that the oil suction port is a concave boss structure, which can avoid the left tire and other structures, thereby reducing the influence of the oil suction port on the left tire and other structures.

[0011] Furthermore, a third extension portion and a fourth extension portion are respectively provided on the left and right sides of the box body away from the rear of the seat, and the third extension portion and the fourth extension portion respectively extend in a direction away from the box body, and the third extension portion and the fourth extension portion are respectively connected to the box body.

[0012] The beneficial effect of adopting the above further solution is that the transversely extending third extension part and the fourth extension part increase the volume of the fuel tank and reduce the possibility of the bottom of the fuel tank being damaged.

[0013] Furthermore, the upper surface shapes of the third extension portion and the fourth extension portion are respectively matched with the upper surface shapes of the fenders of the corresponding tires.

[0014] The beneficial effect of adopting the above further solution is that the external structure of the third extension part and the fourth extension part is designed with the fender, thereby improving the integrity between the rear-mounted fuel tank and the tractor and improving the aesthetics of the fuel tank structure.

[0015] Furthermore, the left side wall of the box body is provided with a limiting groove for limiting and fixing the left side of the fuel tank, and the right side wall of the box body is provided with an installation groove for limiting and fixing the right side of the fuel tank, the limiting groove and the installation groove are respectively recessed toward the inner side of the box body, and the upper part of the box body is integrally formed with two U-shaped ears for fixing the fuel tank.

[0016] The beneficial effects of adopting the above further solution are: the step structures on both sides of the tank body increase the strength of the fuel tank while facilitating the positioning and installation of the fuel tank, and the freedom of the fuel tank in the left and right directions can be limited by the limit grooves and the installation grooves. An integrated U-shaped hanging ear structure is added above the fuel tank, and the fuel tank can be fixed to the safety frame crossbeam through the U-shaped hanging ear, and the freedom of the fuel tank in the front and rear directions can be limited by the two U-shaped hanging ears, thereby improving the convenience and stability of the fuel tank installation.

[0017] Furthermore, the middle part of the side wall of the box body near the seat is arranged adjacent to the seat of the tractor, and the middle part of the side wall of the box body near the seat is provided with a first avoidance portion for providing space for the driver to adjust the seat backward, and the first avoidance portion extends into the box body;

[0018] The bottom of the side wall of the box body near the seat is arranged adjacent to the floor beam of the tractor, and the bottom of the side wall of the box body near the seat is provided with a second avoidance portion for giving way to the floor beam, and the second avoidance portion extends into the box body;

[0019] The upper side wall of the box body is arranged adjacent to the safety frame cross beam of the tractor, and the upper side wall of the box body is provided with a third avoidance portion for giving way to the safety frame cross beam, and the third avoidance portion extends into the box body;

[0020] The first avoidance portion, the second avoidance portion and the third avoidance portion are all strip structures extending along the left-right direction of the box body.

[0021] The beneficial effects of adopting the above further solution are: the first avoidance portion can provide space for the driver to adjust the seat backward, thereby improving the convenience of adjusting the seat backward. The second avoidance portion gives way to the floor beam, and the third avoidance portion gives way to the safety frame beam, thereby increasing the fuel tank volume as much as possible under the premise of reducing the interference between the fuel tank and the boundaries of the tractor, thereby meeting the tractor's endurance.

[0022] Furthermore, the middle part of the box body is arranged corresponding to the middle part of the seat of the tractor, and the fuel tank also includes a fifth avoidance portion located in the middle part of the side of the box body away from the seat, and the fifth avoidance portion extends into the box body, and a step structure is formed between the fifth avoidance portion and the third extension portion and the fourth extension portion.

[0023] The beneficial effect of adopting the above further solution is that during the operation of the tractor, the fifth avoidance portion can provide a field of vision for the driver to observe the rear. A step structure is formed between the fifth avoidance portion and the third extension portion and the fourth extension portion, thereby improving the overall strength of the fuel tank.

[0024] Furthermore, the lower side wall of the box body is provided with a sixth avoidance portion for making way for the suspension devices corresponding to different tractor models and a seventh avoidance portion for making way for the lifting devices corresponding to different tractor models, and the sixth avoidance portion and the seventh avoidance portion are both concave rib structures extending into the box body;

[0025] An eighth avoidance portion for giving way to the hydraulic oil pipe, the central pull rod bracket and the oil buckle of the tractor is also provided below the box body. The eighth avoidance portion is a concave rib structure extending into the box body.

[0026] The beneficial effects of adopting the above further solution are: the sixth avoidance portion can give way to the suspension devices corresponding to various tractor models, and the seventh avoidance portion can give way to the lifting devices corresponding to various tractor models, thereby increasing the effective lifting space of the first pull rod and the second pull rod, adapting to various models, increasing the working space of the machine and satisfying the interchangeability of different tractor models. Both the sixth avoidance portion and the seventh avoidance portion are concave rib structures, which improves the strength of the fuel tank.

[0027] The eighth avoidance part is used to make way for the hydraulic oil pipe and the central tie rod bracket, which can facilitate the rotation of the oil buckle and increase the effective lifting space of the central tie rod, thereby increasing the operating distance of the agricultural machinery. The eighth avoidance part with a concave rib structure improves the strength of the fuel tank.

[0028] Furthermore, a front side wall of the box body close to the seat is provided with a concave rib extending into the box body, and a square opening penetrating the fuel tank front to back is provided at the bottom of the box body.

[0029] The beneficial effect of adopting the above further solution is that the concave ribs and the square openings can increase the strength of the fuel tank and can also be used to fix the pipeline directions of the hydraulic oil pipe and the breathing apparatus pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a fuel tank according to an embodiment of the present application;

[0031] Figure 2 This is a front view of a fuel tank according to an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the structure of a tractor equipped with a fuel tank according to an embodiment of the present application;

[0033] Figure 4 This is a right side view of the fuel tank of the embodiment of the present application;

[0034] Figure 5 A schematic diagram showing the connection structure between the mounting slot and the safety frame according to an embodiment of the present application;

[0035] Figure 6 A schematic diagram showing the connection structure between the limit slot and the safety frame according to an embodiment of the present application;

[0036] Figure 7 It is a schematic diagram of the sixth avoidance structure of the embodiment of the present application.

[0037] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0038] 1. Box body; 2. U-shaped lifting ear; 3. Oil level sensor boss; 4. Refueling port; 5. First extension part; 6. Oil return port; 7. Second extension part; 8. Oil suction port; 9. Oil discharge port; 10. Third extension part; 11. Fourth extension part; 12. Mounting groove; 13. First avoidance part; 14. Second avoidance part; 15. Third avoidance part; 16. Fourth avoidance part; 17. Fifth avoidance part; 18. Sixth avoidance part; 19. Seventh avoidance part; 20. Eighth avoidance part; 21. Concave rib; 22. Square mouth; 23. Limiting groove. DETAILED DESCRIPTION

[0039] The present application is further described in detail below in conjunction with the accompanying drawings. For the sake of convenience of explanation rather than limitation, the up, down, front, back, left, and right of the driver when the tractor is in normal operation are defined as the up, down, front, back, left, and right of the utility model.

[0040] like Figures 1 to 3 As shown, the embodiment of the present application discloses a tractor rear-mounted fuel tank, which can be fixed behind the seat back of the tractor. The fuel tank includes a tank body 1, and the tank body 1 is provided with a first extension 5 on the front side close to the seat, and the first extension 5 extends laterally in a direction away from the tank body 1, and the first extension 5 is connected to the tank body 1. The first extension 5 is provided with an oil return port 6, and the oil return port 6 is used to allow excess fuel to flow back to the tank body 1. The oil return port 6 can be a concave boss structure. In this embodiment, the two sides of the seat include the tires of the tractor and the fenders above the tires.

[0041] like Figure 1 and Figure 2 As shown, a second extension portion 7 is provided at the lower left of the box body 1, and the second extension portion 7 extends in a direction close to the ground. The second extension portion 7 is respectively connected to the box body 1 and the first extension portion 5. An oil suction port 8 is provided on the left side of the second extension portion 7, and the oil suction port 8 is used to suck fuel from the box body 1 into the fuel system for use by the tractor engine.

[0042] In this embodiment, the oil suction port 8 is arranged toward the tire on the left side of the tractor. In order to reduce the influence of the oil suction port 8 on the tire on the left side, the oil suction port 8 can be a concave boss structure for avoiding structures such as the left tire.

[0043] In this embodiment, the straight-line distance between the oil suction port 8 and the oil return port 6 may be 200 mm to 400 mm, and preferably the straight-line distance may be 300 mm.

[0044] An oil drain port 9 is provided on the lower surface of the second extension portion 7 . The oil drain port 9 is used to discharge the fuel in the fuel tank. The oil drain port 9 is located at the lowest point of the entire tank body 1 . Impurities and residual oil in the tank body 1 can be cleaned through the oil drain port 9 .

[0045] like Figure 1 and Figure 3As shown, the left and right sides of the box body 1 away from the rear of the seat are respectively provided with a third extension part 10 and a fourth extension part 11, the third extension part 10 and the fourth extension part 11 extend in a direction away from the box body 1, and the third extension part 10 and the fourth extension part 11 are respectively connected to the box body 1, and are used to increase the volume of the box body 1. In this embodiment, the third extension part 10 is adjacent to the tire on the left side of the tractor, and the fourth extension part 11 is adjacent to the tire on the right side of the tractor. The upper surface shapes of the third extension part 10 and the fourth extension part 11 are respectively adapted to the upper surface shapes of the mudguards of the corresponding tires, and the upper surface shapes may include an upper surface inclination angle and an upper surface length, that is, the upper surface inclination angle and upper surface length corresponding to the third extension part 10 and the fourth extension part 11 are respectively the same as the upper surface inclination angle and upper surface length of the corresponding mudguard. The distance between the third extension part 10 and the fourth extension part 11 and the mudguard can be 10 mm to 30 mm, and the preferred distance can be 20 mm, thereby improving the integrity between the rear-mounted fuel tank and the tractor and improving the aesthetics of the fuel tank structure.

[0046] like Figures 4 to 6 As shown, the left side wall of the box body 1 is provided with a limit groove 23 recessed toward the inside of the box body 1, the outer dimensions of the limit groove 23 are smaller than the outer dimensions of the box body 1, and a step with a height difference is formed between the limit groove 23 and the left side outer wall of the box body 1. The right side wall of the box body 1 is provided with a mounting groove 12 recessed toward the inside of the box body 1, the outer dimensions of the mounting groove 12 are smaller than the outer dimensions of the box body 1, and a step with a height difference is formed between the mounting groove 12 and the right side outer wall of the box body 1. In this embodiment, the stepped structure between the limit groove 23, the mounting groove 12 and the box body 1 improves the strength of the fuel tank.

[0047] like Figures 4 to 6 As shown, the safety frame of the tractor further includes a first clamping structure and a second clamping structure for positioning the fuel tank. In this embodiment, the first clamping structure and the second clamping structure can both be L-shaped fixing plates. When the fuel tank is installed on the tractor, the limiting groove 23 can be clamped with the first clamping structure, and the mounting groove 12 can be clamped with the second clamping structure, so that the left side of the fuel tank can be limited and fixed by the limiting groove 23, and the right side of the fuel tank can be limited and fixed by the mounting groove 12. The limiting groove 23 and the mounting groove 12 can limit the freedom of the fuel tank in the left and right directions.

[0048] like Figure 1 and Figure 3As shown, in this embodiment, two integrated U-shaped lifting ears 2 are provided on the upper part of the box body 1, and the U-shaped lifting ears 2 are both located at the top of the box body 1. The two U-shaped lifting ears 2 are used to install and fix the fuel tank. In this embodiment, the tractor also includes a safety frame crossbeam safely set behind the seat back, and the two U-shaped lifting ears 2 are respectively connected to an L-shaped first fixing plate, and the two first fixing plates are respectively fixedly connected to the safety frame crossbeam, so that the top of the fuel tank can be fixed to the safety frame crossbeam through the two first fixing plates, and the freedom of the fuel tank in the front and rear directions can be limited by the two U-shaped lifting ears 2.

[0049] like Figure 1 and Figure 3 As shown, a fuel level sensor boss 3 is provided on the upper left side of the box body 1, and a refueling port 4 is provided on the upper right side of the box body 1. Fuel can be added to the fuel tank through the refueling port 4. The fuel level sensor boss 3 is a component for installing and fixing the fuel level sensor. It is easy to understand that the fuel level sensor is a sensor for measuring the amount of fuel in the fuel tank. In this embodiment, the box body 1, the U-shaped hanging ear 2, the fuel level sensor boss 3 and the refueling port 4 can be made into an integrated fuel tank by rotational molding.

[0050] like Figure 5 As shown, the bottom surfaces of the first extension portion 5 and the second extension portion 7 can be used for installing and fixing the bottom of the fuel tank. The bottom walls of the first extension portion 5 and the second extension portion 7 are respectively fixedly connected with an L-shaped second fixing plate, and the two second fixing plates are respectively fixedly connected to the safety frame, so that the bottom of the fuel tank can be fixed to the safety frame through the two second fixing plates, thereby limiting the freedom of the fuel tank in the up and down directions.

[0051] like Figure 3 and Figure 4 As shown, the middle part of the side wall of the box body 1 near the seat is arranged adjacent to the seat of the tractor, and the middle part of the side wall of the box body 1 near the seat is provided with a first avoidance portion 13 extending into the box body 1, and the first avoidance portion 13 can provide space for the driver to adjust the seat backward, thereby improving the convenience of adjusting the seat backward.

[0052] The tractor also includes a floor beam. The bottom of the side wall of the box body 1 near the seat is arranged adjacent to the floor beam. The bottom of the side wall of the box body 1 near the seat is provided with a second avoidance portion 14 extending into the box body 1. The floor beam is located at the second avoidance portion 14, and the second avoidance portion 14 is used to make way for the floor beam.

[0053] The upper side wall of the box body 1 is arranged adjacent to the safety frame beam. The upper side wall of the box body 1 is provided with a third avoidance portion 15 extending into the box body 1. When the fuel tank is fixed to the safety frame beam by two U-shaped lifting ears 2, the safety frame beam is located at the third avoidance portion 15, and the third avoidance portion 15 is used to make way for the safety frame beam.

[0054] like Figures 2 to 4 As shown, in this embodiment, the first avoidance portion 13 , the second avoidance portion 14 and the third avoidance portion 15 are all strip structures penetrating the box body 1 along the left-right direction of the box body 1 .

[0055] like Figure 2 and Figure 4 As shown, the tractor further includes an electrical appliance limit box, which is arranged corresponding to the right side of the box body 1. The right side of the box body 1 is provided with a fourth avoidance portion 16 extending into the box body 1. The electrical appliance limit box is located at the fourth avoidance portion 16, and the fourth avoidance portion 16 is used to give way to the electrical appliance limit box. In this embodiment, the outer surface of the fourth avoidance portion 16 can be an inclined surface, that is, the length of the outer surface of the fourth avoidance portion 16 from the central vertical plane of the box body 1 gradually increases in the direction close to the ground.

[0056] like Figure 3 As shown, the middle of the box body 1 is arranged corresponding to the middle of the seat of the tractor, and the fuel tank further includes a fifth avoidance portion 17 located in the middle of the side of the box body 1 away from the seat, and the fifth avoidance portion 17 extends into the box body 1. During the operation of the tractor, the fifth avoidance portion 17 can provide a field of vision for the driver to observe the rear. A step structure is formed between the fifth avoidance portion 17 and the third extension portion 10 and the fourth extension portion 11, thereby improving the overall strength of the fuel tank.

[0057] The tractor includes a suspension device and a lifting device. The suspension device is an important part connecting the tractor and the agricultural implement, allowing the agricultural implement to be mounted on the tractor and can be adjusted as needed. The lifting device is used to control the lifting and lowering of the agricultural implement so as to adjust the height during operation. The suspension device includes a first pull rod, and the lifting device includes a second pull rod.

[0058] like Figure 1 and Figure 7 As shown, the suspension device and the lifting device are respectively located below the box body 1, and the lower side wall of the box body 1 is provided with a sixth avoidance portion 18 and a seventh avoidance portion 19 both extending into the box body 1, the suspension device is located at the sixth avoidance portion 18, and the lifting device is located at the seventh avoidance portion 19, so that the sixth avoidance portion 18 can make way for suspension devices corresponding to various tractor models, and the seventh avoidance portion 19 can make way for lifting devices corresponding to various tractor models, thereby increasing the effective lifting space of the first pull rod and the second pull rod. In this embodiment, the sixth avoidance portion 18 and the seventh avoidance portion 19 are both concave rib structures, which increases the strength of the fuel tank.

[0059] The tractor includes a hydraulic oil pipe, a central tie rod bracket and an oil buckle. The hydraulic oil pipe plays the role of transmitting hydraulic oil in the hydraulic system of the tractor. The central tie rod bracket is the connecting device of the tractor, and the oil buckle is a device used to connect the hydraulic oil pipe with related hydraulic components.

[0060] The hydraulic oil pipe, the central tie rod bracket and the oil buckle are all located below the box body 1 at the fifth avoidance portion 17. The box body 1 is also provided with an eighth avoidance portion 20 extending into the box body 1. The hydraulic oil pipe, the central tie rod bracket and the oil buckle are respectively located at the eighth avoidance portion 20. The eighth avoidance portion 20 is used to give way to the hydraulic oil pipe and the central tie rod bracket, which can facilitate the rotation of the oil buckle and increase the effective lifting space of the central tie rod, thereby increasing the operating distance of the agricultural machinery. In addition, the eighth avoidance portion 20 is a special-shaped concave rib structure, which can effectively improve the strength of the fuel tank.

[0061] In this embodiment, the distance between the sixth avoidance portion 18 and the suspension device, the distance between the seventh avoidance portion 19 and the lifting device, and the distance between the eighth avoidance portion 20 and the oil buckle can all be 20 mm-30 mm, and the preferred distance can be 25 mm.

[0062] like Figure 1 and Figure 2 As shown, a side wall of the box body 1 close to the seat is provided with a concave rib 21 extending into the box body 1, and a square opening 22 penetrating the fuel tank front to back is provided at the bottom of the box body 1. The concave rib 21 and the square opening 22 can provide a direction and space for the hydraulic oil pipe and the respirator pipe, and can also further improve the strength of the fuel tank.

[0063] The terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A tractor rear-mounted fuel tank, characterized in that: The invention comprises a box body (1) fixed behind the backrest of a seat of a tractor, wherein a first extension part (5) extending in a direction away from the box body (1) is provided on a side of the box body (1) close to the seat, and the first extension part (5) is connected to the box body (1).

2. A tractor rear-mounted fuel tank according to claim 1, characterized in that: A second extension portion (7) is provided at the lower left side of the box body (1), the second extension portion (7) extends in a direction close to the ground, the second extension portion (7) is respectively connected to the box body (1) and the first extension portion (5), and an oil drain port (9) is provided on the lower surface of the second extension portion (7).

3. A tractor rear-mounted fuel tank according to claim 2, characterized in that: An oil suction port (8) is provided on the left side of the second extension portion (7), and the oil suction port (8) is a concave boss structure.

4. A tractor rear-mounted fuel tank according to claim 1, characterized in that: The box body (1) is provided with a third extension portion (10) and a fourth extension portion (11) on the left and right sides of the rear away from the seat, respectively. The third extension portion (10) and the fourth extension portion (11) extend in a direction away from the box body (1), respectively. The third extension portion (10) and the fourth extension portion (11) are respectively connected to the box body (1).

5. A tractor rear-mounted fuel tank according to claim 4, characterized in that: The upper surface shapes of the third extension part (10) and the fourth extension part (11) are respectively matched with the upper surface shapes of the mudguards of the corresponding tires.

6. A tractor rear-mounted fuel tank according to claim 1, characterized in that: The left side wall of the box body (1) is provided with a limiting groove (23) for limiting and fixing the left side of the fuel tank, and the right side wall of the box body (1) is provided with a mounting groove (12) for limiting and fixing the right side of the fuel tank. The limiting groove (23) and the mounting groove (12) are respectively recessed toward the inner side of the box body (1), and the upper part of the box body (1) is integrally formed with two U-shaped hanging ears (2) for fixing the fuel tank.

7. A tractor rear-mounted fuel tank according to claim 1, characterized in that: The middle part of the side wall of the box body (1) close to the seat is arranged adjacent to the seat of the tractor, and the middle part of the side wall of the box body (1) close to the seat is provided with a first avoidance portion (13) for providing space for the driver to adjust the seat backwards, and the first avoidance portion (13) extends into the box body (1); The bottom of the side wall of the box body (1) close to the seat is arranged adjacent to the floor beam of the tractor, and the bottom of the side wall of the box body (1) close to the seat is provided with a second avoidance portion (14) for giving way to the floor beam, and the second avoidance portion (14) extends into the box body (1); The upper side wall of the box body (1) is arranged adjacent to the safety frame cross beam of the tractor, and the upper side wall of the box body (1) is provided with a third avoidance portion (15) for giving way to the safety frame cross beam, and the third avoidance portion (15) extends into the box body (1); The first avoidance portion (13), the second avoidance portion (14) and the third avoidance portion (15) are all strip-shaped structures extending in the left-right direction of the box body (1).

8. A tractor rear-mounted fuel tank according to any one of claims 1 to 7, characterized in that: The middle part of the box body (1) is arranged corresponding to the middle part of the seat of the tractor, and the fuel tank further comprises a fifth avoidance portion (17) located in the middle part of the box body (1) on a side away from the seat, the fifth avoidance portion (17) extending into the box body (1), and a step structure is formed between the fifth avoidance portion (17) and the third extension portion (10) and the fourth extension portion (11).

9. A tractor rear-mounted fuel tank according to claim 8, characterized in that: include: The lower side wall of the box body (1) is provided with a sixth avoidance portion (18) for making way for suspension devices corresponding to different tractor models and a seventh avoidance portion (19) for making way for lifting devices corresponding to different tractor models, and the sixth avoidance portion (18) and the seventh avoidance portion (19) are both concave rib structures extending into the box body (1); An eighth avoidance portion (20) for giving way to the hydraulic oil pipe, the central pull rod bracket and the oil buckle of the tractor is also provided below the box body (1); the eighth avoidance portion (20) is a concave rib structure extending into the box body (1).

10. A tractor rear-mounted fuel tank according to claim 9, characterized in that: A side wall of the box body (1) close to the seat is provided with a concave rib (21) extending into the box body (1), and a square opening (22) penetrating the fuel tank from front to back is provided below the box body (1).

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