JP2017065458A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle which enables improvement of the connectivity of a suction hose and a return hose to a fuel tank and suctions and returns a fuel at a position where changes of a liquid surface level caused by swinging of a machine body are small.SOLUTION: A tractor 1 includes a fuel tank 13. A suction pipe 31 which suctions a fuel in the fuel tank 13 and a return pipe 33 which returns a return fuel to the fuel tank 13 are provided in the fuel tank 13. Base end parts of the pipes 31, 33 are connected to nozzles 30, 32 provided on a side surface of the fuel tank 13. Tip parts of the pipes 31, 33 are disposed so as to be positioned near a center part of the fuel tank 13 and below a lower limit liquid surface level L of the fuel.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a working vehicle such as a tractor.

  A working vehicle such as a tractor is provided with a fuel tank, and fuel in the fuel tank is supplied to the engine via a suction hose. For example, Patent Document 1 discloses a working vehicle that includes a pair of left and right fuel tanks and supplies fuel to an engine via a suction hose from a communication hose that communicates the pair of left and right fuel tanks.

JP 2009-137454 A

  In recent years, a common rail system for reducing exhaust gas has been introduced in a working vehicle using a diesel engine as a power source. In the common rail system, fuel that has been pressurized by a supply pump is stored in the rail, and this is injected into each cylinder from the injector based on electronic control. Therefore, the rail is provided with a relief valve to maintain the pressure. The high-temperature fuel discharged here is returned to the fuel tank via the return hose. In a working vehicle employing such a common rail system, the connection of the return hose to the fuel tank is supplied to the engine. It was necessary to take into account air contamination to the suctioned fuel and temperature rise of the sucked fuel.

The present invention was created in view of the above-described circumstances to solve these problems, and the invention of claim 1 is a working vehicle equipped with a fuel tank, the fuel tank Inside, there is a suction pipe that sucks the fuel in the fuel tank and a return pipe that returns the return fuel into the fuel tank, and the base end of both pipes is connected to the nozzle provided on the side of the fuel tank On the other hand, the leading ends of both pipes are disposed in the vicinity of the center in the fuel tank and below the lower limit liquid level of the fuel.
The invention according to claim 2 is the working traveling vehicle according to claim 1, wherein a fuel gauge for detecting a fuel level is provided in the fuel tank, and a suction pipe and a return pipe are provided. Further, it is characterized in that it is arranged in parallel at a predetermined interval in the vertical direction at a position where it does not interfere with the fuel gauge.
The invention according to claim 3 is the working traveling vehicle according to claim 1 or 2, wherein the tip of the suction pipe faces in the front-rear direction of the body or toward the inside of the body, and the tip of the return pipe is outside the body. It is characterized by facing the direction.

According to the invention of claim 1, since the nozzles of the suction pipe and the return pipe are arranged on the side surface of the fuel tank, the connectivity of the suction hose and the return hose to the fuel tank can be improved. In addition, the tips of the suction pipe and the return pipe are arranged in the vicinity of the center in the fuel tank and below the lower limit liquid level of the fuel. In addition to sucking fuel near the center of the fuel tank, the return fuel can be returned to a level below the liquid level to prevent air from entering the return fuel.
According to the invention of claim 2, the suction pipe and the return pipe are arranged in parallel at a predetermined interval in the vertical direction at a position where the suction pipe and the return pipe do not interfere with the fuel gauge, so that the fuel tank does not interfere with the fuel gauge. It becomes possible to arrange the suction pipe and the return pipe in a compact manner using the empty space inside.
According to the invention of claim 3, the tip of the suction pipe faces in the longitudinal direction of the fuselage or inward of the fuselage, and the tip of the return pipe faces outward of the fuselage, so that the return pipe returns to the fuel tank. Thus, it is possible to avoid the drawn high-temperature return fuel from being immediately sucked into the suction pipe, and to suppress the temperature rise of the sucked fuel supplied to the engine.

It is a perspective view of the tractor concerning one embodiment of the present invention. It is a right view of the tractor which concerns on one Embodiment of this invention. It is a principal part front view of the tractor which shows the support structure of a step frame and a fuel tank. It is the perspective view which looked at the support structure of the fuel tank from the upper side. It is the perspective view which looked at the support structure of the fuel tank from the lower side. It is a perspective view of a fuel tank bracket and a lower bracket. It is explanatory drawing which shows the flow of a fuel. (A) is a plan view of the fuel tank, (B) is a side view of the fuel tank, and (C) is a front view of the fuel tank. It is the perspective view which looked at the attachment state of a cementer from the upper part. It is the perspective view which looked at the attachment state of a cementer from the downward direction. It is a perspective view in the engine room which shows arrangement | positioning of the main filter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a tractor (work vehicle). The tractor 1 includes an engine (not shown) mounted in an engine room 2 (see FIG. 11) at the front of the machine body, and the machine body. The transmission case 3 is arranged along the front-rear direction of the left and right central portions of the vehicle, and shifts engine power, the pair of left and right front wheels 4 and rear wheels 5 that are driven to rotate by the power transmitted from the transmission case 3, and a driving unit on which an operator rides. 6 or the like, and an arbitrary working machine is connected to the rear part of the machine body or the front part of the machine body.

  The operation unit 6 of the present embodiment includes a cabin 7 that covers the operator's operation space. On both the left and right sides of the cabin 7, entrances 7a that are opened and closed by doors 8 are provided, and the operator gets in and out of the driving unit 6 through the entrance 7a.

  As shown in FIG. 3, a step frame 9 that supports the floor (step) of the operation unit 6 is provided at the front lower end of the operation unit 6. The step frame 9 extends to the left and right sides so as to straddle the mission case 3 and supports the floor portion of the operation unit 6. In addition, a step 10 for getting on and off that is used at the time of getting on and off is provided at the extending tip of the step frame 9.

  As shown in FIGS. 3 and 4, below the step frame 9, a pair of left and right mount brackets 11 for supporting the step frame 9 in an anti-vibration manner are provided. The mount bracket 11 extends from the upper part of the mission case 3 to the left and right sides, and the extension intermediate part of the step frame 9 is supported in an anti-vibration manner at the upper end of the tip side. More specifically, the mount bracket 11 has a base end portion fastened to the upper side surface of the transmission case 3, while a tip end portion extends to the inside of the step 10 for getting on and off, and is provided at the upper end on the tip end side. The extension intermediate portion of the step frame 9 is supported by vibration isolation via the vibration member 12.

  As shown in FIGS. 3 to 6, a pair of left and right fuel tanks 13 are disposed below the step frame 9 and on both left and right sides of the mission case 3. The left and right fuel tanks 13 are, for example, steel plate tanks, and communicate with each other via a communication hose 15. In the present embodiment, a fuel filler port 16 is provided in the left fuel tank 13, and fuel supplied from the fuel tank 16 is stored approximately equally in the left and right fuel tanks 13. Further, a suction hose 17 and a return hose 18 are connected to the right fuel tank 13, and fuel in the right fuel tank 13 is supplied to the engine via the suction hose 17, while unburned return fuel is supplied. Is returned to the right fuel tank 13 through the return hose 18.

  The left and right fuel tanks 13 are attached to the fuselage via left and right fuel tank brackets 19, respectively. The fuel tank bracket 19 has a box shape with an upper opening, and a fuel tank via a rubber plate 20 at the bottom. 13 is mounted, and the fuel tank 13 is fixed to the fuel tank bracket 19 using a belt-like clamp 21.

  A lower bracket 22 extending in the left-right direction is fixed to the lower portion of the transmission case 3, and the inner end portions of the left and right fuel tank brackets 19 are connected to the left and right ends thereof. Further, the outer end side of the fuel tank bracket 19 is suspended at the front end side of the left and right mount brackets 11, and the left and right fuel tanks 13 attached to the left and right fuel tank brackets 19 have a predetermined interval. And disposed below the mount bracket 11.

  In this way, the fuel tank 13 can be protected using the mount bracket 11. Further, since the fuel tank bracket 19 to which the fuel tank 13 is attached is suspended at the tip end side of the mount bracket 11, even if a situation occurs in which the mount bracket 11 is deformed as the step frame 9 is deformed. The fuel tank bracket 19 can follow the deformation of the mount bracket 11, and as a result, the distance between the mount bracket 11 and the fuel tank 13 is maintained as much as possible, and the fuel tank 13 is brought into contact with the mount bracket 11. Damage can be prevented.

  The fuel tank bracket 19 of the present embodiment includes a cover 19 a that covers the outer side of the fuel tank 13. According to such a fuel tank bracket 19, even when a situation occurs in which the boarding / alighting step 10 disposed outside the fuel tank 13 is deformed, the boarding / alighting step 10 directly contacts the fuel tank 13. The fuel tank 13 can be prevented from being damaged.

  In the present embodiment, when the cover 19 a is provided on the fuel tank bracket 19, the cover 19 a is also used as a suspension member for the fuel tank bracket 19. That is, the cover 19 a extends upward from the tip of the fuel tank bracket 19 and is fastened to the tip of the mount bracket 11.

  As shown in FIG. 7, the engine mounted on the tractor 1 of the present embodiment is a diesel engine, and a common rail system is employed to reduce the exhaust gas. The common rail system of the present embodiment is configured to include a cementer 23, a pre-filter 24, an electromagnetic pump 25, a main filter 26, a supply pump 27, a common rail 28, and a fuel cooler 29.

  The electromagnetic pump 25 sucks the fuel in the fuel tank 13, the separator 23 separates water mixed in the sucked fuel, and the pre-filter 24 filters the fuel upstream of the electromagnetic pump 25. Note that the cementer 23 may also be used as a pre-filter 24 having a cementer function.

  The main filter 26 filters fuel on the downstream side of the electromagnetic pump 25, and the supply pump 27 pumps the filtered fuel to the common rail 28. At that time, surplus fuel is returned to the fuel tank 13 via the fuel cooler 29.

  The common rail 28 stores high-pressure fuel pumped from the supply pump 27. The high-pressure fuel in the common rail 28 is injected into each cylinder from an injector (not shown) based on electronic control. The common rail 28 is provided with a relief valve (not shown) for maintaining pressure, and the fuel discharged from the common rail 28 is returned to the fuel tank 13 via the fuel cooler 29.

  As shown in FIG. 8, the right fuel tank 13 includes a suction nozzle 30 connected to the suction hose 17, a suction pipe 31 extending from the suction nozzle 30 into the tank, and a return connected to the return hose 18. A nozzle 32, a return pipe 33 extending from the return nozzle 32 into the tank, and a fuel gauge 34 for detecting the fuel level in the tank are provided.

  The fuel gauge 34 is supported by a float 35 that floats on the fuel level inside the fuel tank 13, a detection unit 36 that is fixed to the upper part of the fuel tank 13, and a base end portion that is rotatable up and down by the detection unit 36. , And a detection arm 37 whose tip is connected to the float 35. The float 35 moves up and down according to the change in the fuel level in the tank, and the detection arm 37 rotates up and down according to the up and down movement of the float 35. And the detection part 36 detects the up-and-down rotation angle of the detection arm 37, and outputs this as a fuel liquid level detection signal.

  The rotation range of the detection arm 37 is defined in advance, and its lower limit position is based on the float 35 position when the fuel level in the tank has dropped to the lower limit level L (fuel outage alarm level). Is set. In the present embodiment, a virtual line K shown in FIG. 8B is a movement locus of the float 35, and the suction pipe 31 and the return pipe 33 are arranged so as not to interfere with this movement locus.

  The suction nozzle 30 and the return nozzle 32 are provided on the side surface of the fuel tank 13. In the present embodiment, the suction nozzle 30 and the front side of the fuel tank 13 that faces the inside of the body, the side that faces the outside of the body, the side that faces the front of the body, and the side that faces the rear of the body, face the inside of the body. A return nozzle 32 is arranged. According to such a nozzle arrangement, not only can the nozzles be arranged on the upper and lower surfaces of the fuel tank 13, the connectivity of the suction hose 17 and the return hose 18 to the fuel tank 13 can be improved. It is possible to shorten the lengths of the suction hose 17 and the return hose 18 by bringing them closer to the engine room 2.

  The suction pipe 31 extends from the suction nozzle 30 into the fuel tank 13 to suck the fuel in the fuel tank 13, and the return pipe 33 extends from the return nozzle 32 into the fuel tank 13 to return the returned fuel to the fuel tank 13. When returning inside, the front-end | tip part of both the pipes 31 and 33 is arrange | positioned so that it may be located in the vicinity of the center part in the fuel tank 13, and below the minimum liquid level of a fuel. In this way, not only can the fuel be sucked in the vicinity of the center in the fuel tank 13 where the change in the liquid level due to the swinging of the airframe is small, but the return fuel is returned below the liquid level and air is mixed by the return fuel. Can also be prevented.

  The suction pipe 31 and the return pipe 33 are arranged in parallel at a predetermined interval in the vertical direction when arranged in the fuel tank 13 while avoiding interference with the float 35 and the detection arm 37 of the fuel gauge 34. . More specifically, the suction pipe 31 and the return pipe 33 are arranged in parallel in the vertical direction using an empty space in the fuel tank 13 that exists on the front side of the airframe from the movement locus K of the float 35 shown in FIG. Are arranged compactly.

  The tip of the suction pipe 31 that is juxtaposed below the return pipe 33 and extends outward from the suction nozzle 30 is bent in an inclined manner toward the lower rear side of the fuselage and is below the lower liquid level lower limit level L. The leading end side of the return pipe 33 extending from the return nozzle 32 to the outside of the machine body is bent downward in an inclined manner while facing the outside of the machine body and reaches below the liquid level lower limit level L. In this way, since the tip portions of the pipes 31 and 33 are directed in different directions, it is avoided that the high-temperature return fuel returned into the fuel tank 13 by the return pipe 33 is immediately sucked into the suction pipe 31, An increase in the temperature of the suction fuel supplied to the engine can be suppressed. Note that the tip of the suction pipe 31 may face the front of the body or the inside of the body.

  As shown in FIG. 9 and FIG. 10, the cementer 23 performs an operation for discharging water stored in the water storage unit 23 a and a water storage unit 23 a that stores water separated from the fuel so as to be visible from the outside. A water draining operation unit 23b and an air venting operation unit 23c for performing an operation for venting the air in the segmenter 23 are provided.

  The cementer 23 is mounted in front of the right fuel tank 13 and on the front side of the step frame 9 via a bracket 38. Since the front wheel 4 is located in front of this mounting position, it is unlikely that contact with an obstacle will occur, and damage due to contact between the obstacle 23 and the obstacle can be prevented. In addition, the mounting position is easier to check and drain the water accumulated in the cementer 23 than in the engine room 2.

  Furthermore, in the present embodiment, a cover 39 that covers the front of the cementer 23 and opens the side of the cementer 23 is attached to the bracket 38 of the cementer 23. More specifically, the cover 39 of the present embodiment covers the front, upper and inner sides of the cementer 23 and opens the outer and lower sides of the cementer 23. According to such a cover 39, the exhaust air (hot air) of the engine is prevented from directly hitting the semi-dimensioner 23 without disturbing the confirmation of the water accumulated in the semi-dimensioner 23 and the draining operation thereof, and the temperature of the fuel rises. Can be suppressed.

  As shown in FIG. 11, the main filter 26 is disposed in front of the radiator 40 in the engine room 2. The fuel can be efficiently cooled immediately before being sent to the supply pump 27, and a decrease in engine performance due to an increase in fuel temperature can be suppressed.

  According to the present embodiment configured as described, the tractor 1 includes a fuel tank 13, and a suction pipe 31 that sucks fuel in the fuel tank 13 and a return fuel into the fuel tank 13. And a return pipe 33 that returns to the inside of the fuel tank 13, and the base ends of the pipes 31 and 33 are connected to the nozzles 30 and 32 provided on the side surface of the fuel tank 13. The connectivity of the return hose 18 can be improved. Further, the tip portions of the suction pipe 31 and the return pipe 33 are arranged in the vicinity of the center portion in the fuel tank 13 and below the lower limit liquid level L of the fuel. Accordingly, not only can the fuel be sucked in the vicinity of the center in the fuel tank 13 where the change in the liquid level is small, but the return fuel can be returned below the liquid level to prevent air from entering the return fuel.

  In addition, a fuel gauge 34 for detecting the fuel level is provided in the fuel tank 13, and the suction pipe 31 and the return pipe 33 are arranged at predetermined positions in the vertical direction at positions where they do not interfere with the float 35 of the fuel gauge 34. Since they are arranged in parallel at intervals, it is possible to arrange the suction pipe 31 and the return pipe 33 in a compact manner by utilizing an empty space in the fuel tank 13 that does not interfere with the float 35 of the fuel gauge 34.

  Further, since the tip of the suction pipe 31 faces in the longitudinal direction of the machine or toward the inside of the machine, and the tip of the return pipe 33 faces outside of the machine, the return of the high temperature returned to the fuel tank 13 by the return pipe 33 It is possible to prevent the fuel from being immediately sucked into the suction pipe 31, and to suppress the temperature rise of the sucked fuel supplied to the engine.

1 Tractor 13 Fuel tank 30 Suction nozzle 31 Suction pipe 32 Return nozzle 33 Return pipe 34 Fuel gauge 35 Float

Claims (3)

A working vehicle equipped with a fuel tank,
In the fuel tank,
A suction pipe for sucking the fuel in the fuel tank;
A return pipe for returning the return fuel into the fuel tank,
The base ends of both pipes are connected to a nozzle provided on the side of the fuel tank, while the tips of both pipes are near the center of the fuel tank and below the lower liquid level of the fuel. A working vehicle characterized by being disposed so as to be positioned.   A fuel gauge for detecting the level of the fuel is provided in the fuel tank, and the suction pipe and the return pipe are arranged in parallel at a predetermined interval in a vertical direction at a position not interfering with the fuel gauge. The working vehicle according to claim 1, wherein the vehicle is a work vehicle.   The working vehicle according to claim 1 or 2, wherein a tip end portion of the suction pipe faces a front-rear direction of the machine body or toward the inside of the machine body, and a tip part of the return pipe faces the outside of the machine body.

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