JP5043546B2 - Fuel tank - Google Patents

Description

The present invention relates to a fuel tank in a work vehicle such as a tractor, and more particularly to a technique for forming a cooling air passage by the fuel tank and enhancing the cooling effect of an oil pan below the engine.

2. Description of the Related Art Conventionally, in a work vehicle such as a tractor, a technique for forming a cooling air passage by arranging a plate-like cooling air guiding member at the lower part of an engine is known as a configuration for cooling an oil pan below the engine. (For example, refer to “Patent Document 1” and “Patent Document 2”).
Japanese Patent Laid-Open No. 5-16675 JP 2004-255984 A

  However, in the prior art described above, the installation work for disposing the cooling air guiding member is complicated, and the cost is increased due to an increase in the number of parts.

In order to solve the above-described problems, the present invention provides a fuel tank capable of suppressing the number of parts by simply configuring a cooling air passage.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

In Claim 1, in the structure which arrange | positions the engine (5) which comprises a cooling fan (5b), a radiator (41), and a fuel tank (51) on an airframe frame (8), this fuel tank ( 51), a concave portion having a substantially U-shape in front view is formed in the front-rear direction at the center of the left and right sides, and the fuel tank (51 ) Is extended below the radiator (41) and the cooling fan (5b) to form a front extension (51b), and the upper surface of the front extension (51b) is on the engine (5) side. Inclined downward, between the lower side of the radiator (41) and the cooling fan (5b) and the upper surface of the front extension part (51b) of the fuel tank (51) arranged to extend below the radiator (41) Engine (5) oil And a recess (51a) formed in a semi-cylindrical shape is formed in the front-rear direction of the center of the left and right sides of the front extension (51b). 51a) is communicated with the recess for passing through the drive shaft .

  As effects of the present invention, the following effects can be obtained.

In Claim 1, in the structure which arrange | positions the engine (5) which comprises a cooling fan (5b), a radiator (41), and a fuel tank (51) on an airframe frame (8), this fuel tank ( 51), a concave portion having a substantially U-shape in front view is formed in the front-rear direction at the center of the left and right sides, and the fuel tank (51 ) Is extended below the radiator (41) and the cooling fan (5b) to form a front extension (51b), and the upper surface of the front extension (51b) is on the engine (5) side. Inclined downward, between the lower side of the radiator (41) and the cooling fan (5b) and the upper surface of the front extension part (51b) of the fuel tank (51) arranged to extend below the radiator (41) Engine (5) oil Since the formation of the cooling air passage to the emissions (5a), by the upper surface to flow the cooling air of the fuel tank extending portion, it is possible to enhance the cooling effect of the oil pan in the engine lower part.

  Moreover, compared with the structure which arrange | positions a baffle plate in a flame | frame, a number of parts can be decreased and cost can be held down.

In addition, a concave portion (51a) having a semi-cylindrical shape is formed in the front-rear direction of the center of the left and right of the front extension portion (51b), and the concave portion (51a) is formed as a concave portion for passing through the drive shaft Therefore, the recess (51a) can guide the cooling air to concentrate on the oil pan (5a) below the engine (5), thereby enhancing the cooling effect of the oil pan. it can.
Further, the surface area of the fuel tank itself is increased, and the heat dissipation effect is enhanced, thereby preventing the temperature increase of the fuel tank.

  Further, by circulating the cooling air along the surface of the fuel tank extension portion, it is possible to concentrate the cooling air on the oil pan below the engine, thereby further enhancing the cooling effect of the oil pan.

  Moreover, the shape which guides cooling air to an oil pan effectively can be easily formed compared with the conventional plate-shaped cooling air induction member.

  Next, embodiments of the invention will be described. It should be noted that the technical scope of the present invention is not limited to the embodiments, but extends to the entire scope of the technical idea that the present invention truly intends, as will be apparent from the matters described in the present specification and drawings. It is.

  FIG. 1 is a side view showing the overall configuration of a work vehicle (tractor). FIG. 2 is a side view showing the configuration inside the hood and inside the dashboard. FIG. 3 is a side view showing a cooling structure of the engine according to the present invention. FIG. 4 is also a plan view. FIG. 5 is a plan view of the fuel tank according to the present invention.

  FIG. 6 is also a partially cutaway side view. FIG. 7 is a perspective view of the same. FIG. 8 is a side view showing a cooling air blowing state by the fuel tank. FIG. 9 is a perspective view showing an installed state of the radiator screen. FIG. 10 is also a side view.

[overall structure]
First, the whole structure of the tractor 1 as one embodiment of the work vehicle according to the present invention will be described. In this embodiment, the front, rear, left and right are determined in the traveling direction. As shown in FIG. 1, the tractor 1 supports the front wheels 2 and 2 and the rear wheels 3 and 3 on the front and rear of the airframe. The front bonnet 31 is pivotally supported on the body frame 8 and 8 by a pivot shaft 32 provided at the front lower portion thereof, and the engine 5 is disposed inside the bonnet 31, A steering handle 6 is provided, and a seat seat 7 is disposed behind the steering handle 6. In addition, a main transmission lever, a work implement lifting lever, and the like (not shown) are disposed on the side portion of the seat 7.

  The engine 5 is supported in an anti-vibration manner on the body frames 8 and 8, and a drive shaft (not shown), a transmission case, and the like are disposed at the rear of the engine 5. The driving force of the engine 5 drives the rear wheels 3 and 3 through a drive shaft, a transmission case, etc., and further transmits the driving force from the transmission case to the front wheels 2 and 2 through a front wheel driving shaft (not shown). ing.

  A dashboard 23 is provided behind the bonnet 31. The dashboard 23 covers and covers a fuel tank 51, a power steering valve (not shown), and the like. On the dashboard 23, an instrument panel, a key switch, an assist grip 38, and the like are provided. Has been placed. A step 25 is formed below the dashboard 23, and the step 25 is fixed to the body frame 8 or 8 via a stay or the like.

[Bonnet 31]
As shown in FIGS. 2 to 4, the inside of the bonnet 31 extends rearwardly from the air cleaner 35 disposed above the engine, in addition to the engine 5 disposed in the front part of the bonnet 31. The primary intake hose 34 provided, the secondary intake hose 36 connecting the air cleaner 35 and the engine 5, the muffler 39 disposed at the upper right of the engine 5 and connected to the engine 5 by an exhaust pipe (not shown), and the fuselage from the front of the muffler 39 The exhaust pipe 40 is extended to the lower right front, the radiator bracket 48 is erected on the body frame 8, 8 at the rear of the bonnet 31, the radiator 41 is installed on the radiator bracket 48 behind the engine 5, and the like. The

  The air cleaner 35 sucks air from the intake port at the rear of the bonnet 31 through the primary intake hose 34, removes dust contained in the air, and sends air to the engine 5 through the secondary intake hose 36. The exhaust gas discharged from the engine 5 passes through the muffler 39 and is then discharged from the exhaust pipe 40 that leads from the front of the muffler 39 to the lower right front of the fuselage. Further, the cooling water in the radiator 41 is circulated to the engine 5 after being cooled by the air flowing in from the rear portion of the dashboard 23.

[Dashboard 23]
On the other hand, a column bracket 50 for mounting a steering device such as a steering handle 6 and a handle column is provided on the body frame 8, 8 inside the dashboard 23. A handle column is fixed on the column bracket 50, a steering shaft is supported on the handle column, and a steering handle 6 is fixed on an upper portion of the steering shaft. An instrument panel 37 is provided at the front upper part of the handle column and covered with the dashboard 23.

[Fuel tank 51]
Next, the attachment and shape of the fuel tank 51 will be described with reference to FIGS. As shown in FIG. 2, a fuel tank 51 is disposed on the body frame 8, 8 and behind the engine 5 so as to be fixed inside the column bracket 50. As shown in FIGS. 4 and 5, the semi-circular abutment portions 51 c, 51 c in a plan view are protruded in the left and right front portions at the left and right front portions of the fuel tank 51. It is formed to be substantially the same as the interval of 8 · 8. Further, a fixing flange 51d is formed to protrude rearward substantially at the left and right central portion of the rear end of the fuel tank 51.

  On the other hand, as shown in FIG. 6, the front stay 8a, which is a plate-like member formed in a substantially L shape in a side view, and a crank shape in a side view are formed in the front-rear middle part between the body frames 8 and 8. A rear stay 8b, which is a plate-like member, is installed in the horizontal direction. A rear support frame 52, which is a plate-like member formed in a crank shape in side view and having mounting bolt holes 52a and 52a opened, is fixed to the upper surface of the rear portion of the rear stay 8b.

  When the fuel tank 51 is attached to the body frame 8 or 8, the front portion of the fuel tank 51 is placed on the front stay 8a, the rear portion is placed on the rear stay 8b, and the front end of the fuel tank 51 is placed on the front stay 8a. Since the front flange is positioned at the same time, and the fixing flange 51d is fastened to the rear support frame 52 by a fastening member such as a bolt, the front and rear, left and right positioning on the rear side of the fuel tank 51 is performed. is there. At this time, the abutment portions 51c and 51c abut on the left and right body frames 8 and 8, thereby positioning and fixing the front side of the fuel tank 51 in the left and right direction. Then, a gap is formed between the side surface of the fuel tank 51 and the inside of the left and right body frames 8 and 8 by the corresponding contact portions 51c and 51c, so that hot air is not retained and heat dissipation is improved.

  As shown in FIGS. 4 and 5, the fuel tank 51 is formed in a substantially T shape in plan view. As shown in FIGS. 6 and 7, the front extension 51b is formed in a substantially rectangular parallelepiped shape that is gently inclined toward the front lower side. A recess 51a having a shape penetrating the shape is formed. Also, a concave portion is formed in the front-rear direction at the left and right center upper portion of the fuel tank 51, and is configured in a substantially U shape in front view so that a drive shaft can be disposed in the concave portion. In other words, the fuel tank 51 is disposed so that the drive shaft passes through the upper portion in the front-rear direction, and the fixed portion of the fuel tank 51 does not interfere with the drive shaft.

[Engine cooling structure]
As shown in FIG. 3, the fuel tank 51 is disposed such that the front extension 51 b is positioned below the radiator 41 attached to the radiator bracket 48 and the cooling fan 5 b provided at the rear of the engine 5. The When the engine 5 is driven, an air flow is generated in the direction of arrow A in FIGS. 3 and 4 by the rotation of the cooling fan 5b. Thereby, the air which cooled the cooling water which flows through the radiator 41 flows in the direction of the engine 5 as cooling air after that, and the engine 5 is cooled.

  Thus, in the structure which cools the engine 5, a negative pressure generate | occur | produces by the rotation of the cooling fan 5b ahead of the radiator 41 (left side in FIG. 3). As a result, air behind the radiator 41 flows in from the gap between the radiator 41 and the fuel tank 51, and an air flow is generated in the direction of arrow B in FIGS. 3 and 4 along the inclination of the front extension 51b. To do. Further, the air flows in the direction of arrow C in FIG. 3, hits the rear surface of the oil pan 5a located at the lower part of the engine 5, and then flows below the bottom surface of the oil pan 5a to intensively cool the oil pan 5a. is there. In other words, a cooling air passage is formed between the lower side of the radiator 41 and the cooling fan 5b and the upper surface of the front extending portion 51b arranged to extend below the radiator 41 and the cooling fan 5b, and the upper surface of the front extending portion 51b is a guide for the cooling air. It becomes a surface. The cooling air induced in the cooling air passage can increase the cooling efficiency of the oil pan 5a.

  As described above, in the tractor 1 in which the engine 5 including the cooling fan 5b, the radiator 41, and the fuel tank 51 are mounted on the body frames 8 and 8, a part of the fuel tank 51 is combined with the radiator 41 and the cooling unit. It extends below the fan 5b, and the upper surface of the front extending portion 51b is arranged to be inclined toward the engine 5 side.

  Thereby, the cooling effect of the oil pan 5a in the lower part of the engine 5 can be enhanced by circulating the cooling air on the upper surface of the front extending portion 51b. Moreover, compared with the structure which arrange | positions a baffle plate on the body frame 8 * 8, a number of parts can be decreased and cost can be held down.

  Further, as shown in FIGS. 4 to 7, a recessed portion 51a is provided in the front-rear direction at a substantially right and left center of the front extending portion 51b. The recess 51a makes it easy for air flowing in the direction of the arrow B to flow in, concentrates on the oil pan 5a below the engine 5 and induces cooling air, thereby enhancing the cooling effect of the oil pan 5a. is there. Further, the surface area of the fuel tank 51 itself is increased, and the temperature increase of the fuel tank 51 can be prevented by increasing the heat dissipation effect.

  Further, as shown in FIG. 8, the fuel tank 51 is configured to allow the cooling air to flow along the engine 5 side front surface 51f from the bottom surface 51e of the recess 51a without being separated from the surface of the fuel tank 51. . Specifically, the bottom surface 51e of the recess 51a and the front surface 51f on the engine 5 side are formed in a smooth curved surface having no protrusions or depressions. As a result, the cooling air can easily flow along the bottom surface 51e and the front surface 51f of the concave portion 51a, and the cooling air can be guided to concentrate on the oil pan 5a below the engine 5, thereby reducing the cooling effect of the oil pan 5a. It can be further increased.

[Radiator screen 42]
Next, a method for arranging the radiator screen 42 will be described. The radiator screen 42 is a net-like member disposed on the radiator bracket 48 behind the radiator 41, filters dust and dust sent to the radiator 41 together with cooling air generated by the cooling fan 5 b, and the dust and dust adhere to the radiator 41. To prevent it. Conventionally, the radiator screen 42 is provided with a substantially L-shaped hooking stay on the upper rear surface, and the hooking stay is fixed to the radiator bracket 48 to prevent it from falling off. Thus, since it is necessary to manufacture and integrate the stay for latching which is a member different from the radiator screen 42, the number of parts and work processes have increased.

  In this embodiment, as shown in FIGS. 9 and 10, the radiator screen 42 is bent in a substantially “h” shape in a side view to form a latching portion 42 a. When the radiator screen 42 is disposed on the radiator bracket 48, the latching portion 42 a is latched on the radiator bracket 48 and fixed. With this configuration, the radiator screen 42 can be disposed on the radiator bracket 48 without providing separate parts, and can be prevented from falling off. The parts cost and manufacturing process for providing a conventional latching stay can be prevented. Can be suppressed. In addition, since the hook portion 42a has two meshes and the mesh is clogged, it can have a sealing effect for preventing the inflow of air, dust, and dust.

The side view which showed the whole structure of the work vehicle (tractor). The side view which showed the structure inside a bonnet and a dashboard. The side view which showed the cooling structure of the engine which concerns on this invention. FIG. The top view of the fuel tank which concerns on this invention. Similarly, a partially cutaway side view. Similarly perspective view. The side view which showed the ventilation state of the cooling air by a fuel tank. The perspective view which showed the installation state of the radiator screen. Similarly side view.

1 Tractor 5 Engine 5a Oil pan 6 Steering handle 8 Airframe frame 23 Dashboard 31 Bonnet 41 Radiator 42 Radiator screen 51 Fuel tank

Claims (1)

In the configuration in which the engine (5) including the cooling fan (5b), the radiator (41), and the fuel tank (51) are arranged on the body frame (8), the upper left and right centers of the fuel tank (51) In the front-rear direction, a concave portion configured in a substantially U shape in front view is formed, and the drive shaft is allowed to pass through the concave portion in the front-rear direction without interference, and a part of the fuel tank (51) is A lower extension of the radiator (41) and the cooling fan (5b) constitutes a front extension (51b), and an upper surface of the front extension (51b) is inclined downward on the engine (5) side, The oil of the engine (5) is disposed between the radiator (41), the lower side of the cooling fan (5b), and the upper surface of the front extension part (51b) of the fuel tank (51) arranged to extend below the radiator (41). Cooling to pan (5a) A passage is formed, and a concave portion (51a) formed in a semicylindrical shape is formed in the front-rear direction of the center of the front extension portion (51b) on the left and right sides, and the concave portion (51a) passes through the drive shaft. A fuel tank characterized in that it communicates with a concave portion for use.

Images