JP5524661B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle, and more particularly to a technique for cooling a fuel pipe of the work vehicle.

  2. Description of the Related Art Conventionally, a working vehicle that includes an engine disposed at the front portion of a traveling vehicle and covered with a bonnet and a fuel tank disposed behind the bonnet and that communicates the engine and the fuel tank through a fuel pipe is known. It is. In such a work vehicle, the fuel pipe is disposed below a vehicle body cover placed on a vehicle body frame, and is stored in the fuel tank by a fuel pump (feed pump) disposed in the vicinity of the fuel tank. It is comprised so that the made fuel may be supplied toward the said engine (for example, refer patent document 1).

JP 2003-79203 A

  In the technique described in Patent Document 1, the fuel supplied to the engine through the fuel pipe is heated to a high temperature because pressure is applied by the fuel pump or excess fuel is returned to the fuel tank. was there. When the temperature of the fuel becomes high, there are cases in which, for example, the output of the engine decreases or the viscosity of the fuel decreases to cause seal leakage.

  Then, this invention makes it a subject to provide the work vehicle which can cool the fuel supplied to an engine from a fuel tank by fuel piping.

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

That is, in claim 1, the engine disposed on the vehicle body frame in a state where the crankshaft is transverse to the traveling direction of the airframe, the radiator disposed on one lateral side of the engine, and the engine A cooling fan arranged between the radiator and driven to rotate by the engine; covers the engine, the radiator, and the cooling fan; and a ventilation inlet at a portion facing the radiator in a lateral direction; and the engine And a fuel tank disposed behind the bonnet, and a fuel pipe communicating the fuel tank and the engine. The air sucked into the bonnet through the ventilation inlet by the rotation of the fan is moved around the engine. Flow, the ventilation outlet and is exhausted to the outside of the hood through the vehicle frame mounting the hood, the fuel pipe is held on the body frame, the from the fuel tank to the front of the engine The engine is extended to the other side of the engine, and is extended while bending a plurality of portions from the tip portion toward the upper side of the engine .

In Claim 2 , The steering member arrange | positioned behind the said engine and covered with the said bonnet, The transmission case arrange | positioned behind the said steering member, The hydraulic type arrange | positioned at the said horizontal one side of the said transmission case A continuously variable transmission, a charge pump disposed on the other side of the side, and a hydraulic pipe communicating the hydraulic continuously variable transmission and the charge pump, wherein the hydraulic pipe is located in front of the steering member. It is arranged so as to go around.

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

  According to the first aspect of the present invention, since the heat exchange area in the fuel pipe is increased around the engine where the air sucked into the bonnet is blown, the cooling effect of the fuel pipe can be enhanced. As a result, the fuel supplied from the fuel tank to the engine can be cooled by the fuel pipe, and for example, a decrease in the output of the engine due to the high temperature of the fuel can be prevented.

  Further, since a fuel cooler or the like is not required and the fuel supplied by the fuel pipe can be cooled with an easy configuration, the cost can be reduced.

In addition , by using existing members such as an engine and a body frame provided in the work vehicle and skillfully utilizing the arrangement of these members, the fuel pipe is bent at a plurality of parts around the engine. Is arranged. That is, it is possible to enhance the cooling effect of the fuel pipe to the maximum without installing an attachment member such as an attachment stay for installing the fuel pipe and without changing the arrangement of the existing member.

In claim 2 , the hydraulic piping can be cooled by the air circulating inside the bonnet. As a result, the hydraulic fluid supplied from the charge pump to the hydraulic continuously variable transmission can be cooled by the hydraulic piping, and deterioration of the hydraulic fluid can be prevented. In addition, since no hydraulic oil cooler or the like is required, and the hydraulic oil supplied by the hydraulic piping can be cooled with an easy configuration, the cost can be reduced.

The side view which shows the whole rice transplanter structure concerning one Embodiment of this invention. Similarly, the top view which shows the whole structure. Similarly, the perspective view which shows the structure of a vehicle body frame. Similarly, the perspective view which shows an engine and its surrounding attachment structure. Similarly, the perspective view which shows the attachment structure of a mission case. Similarly, the top view which shows the structure of a mission case. Similarly, the perspective view which shows the structure of a vehicle body cover. Similarly, the perspective view which shows the structure of a bonnet. Similarly, (a) The front view which showed the flow of the air inside a bonnet, (b) The top view which showed the flow of the air inside a bonnet. Similarly, the perspective view which shows the structure of fuel piping.

  First, the whole structure of the rice transplanter 1 which concerns on one Embodiment of this invention is demonstrated using FIG. 1 and FIG. In this embodiment, the rice transplanter 1 is an eight-planted rice transplanter, but is not particularly limited, and may be, for example, a six-row or ten-row planter. In the following, the front and rear directions are defined with the direction indicated by the arrow A in the figure as the front. Further, a direction perpendicular to the front-rear direction and the horizontal direction is defined as a left-right direction.

  As shown in FIG. 1, the rice transplanter 1 includes a traveling unit 10 and a planting unit 40, and is configured so that seedlings can be planted in a field by the planting unit 40 while traveling by the traveling unit 10. The The planting part 40 is arrange | positioned at the back of the traveling part 10, and is connected with the rear part of this traveling part 10 via the raising / lowering mechanism 70 so that raising / lowering is possible.

  In the traveling unit 10, the engine 30 is provided on the front portion of the vehicle body frame 14 and is accommodated by the bonnet 17. A radiator 32 and a radiator cover 33 are disposed on the right side of the engine 30. A mission case 60 is supported by the vehicle body frame 14 behind the engine 30.

  The front axle case 11 is supported on the front portion of the vehicle body frame 14, and the front wheels 15 are attached to the left and right sides of the front axle case 11. The rear axle case 12 is supported by the rear portion of the vehicle body frame 14, and the rear wheels 16 are attached to the left and right sides of the rear axle case 12.

  The power transmission mechanism transmits the power of the engine 30 to the left and right front wheels 15 and the left and right rear wheels 16 via the mission case 60 so that the front wheels 15 and the rear wheels 16 rotate. Configured. Thereby, the traveling unit 10 can travel forward or backward.

  In the traveling unit 10, a driving operation unit 13 is provided in the middle of the vehicle body 14 before and after. An annular steering handle 20 for steering operation, a shift pedal for shifting operation, and the like are disposed in front of the driving operation unit 13. A driver's seat 21 is disposed at the rear of the driving operation unit 13 so as to be located behind the steering handle 20. A fuel tank 27 is disposed below the driver seat 21.

  In addition, around the steering handle 20 and the driver's seat 21 of the driving operation unit 13, a dashboard 19, a vehicle body cover 18 having a part of the step for getting on and off, and other operating tools such as a lever and a switch are arranged. . With the steering handle 20, the speed change pedal, and other operation tools, it is possible to perform appropriate operations on the traveling unit 10 and the planting unit 40.

  In the traveling unit 10, the preliminary seedling mounts 25 are attached to the respective attachment frames 24 erected from the left and right sides of the front portion of the body frame 14, and are arranged on the left and right sides of the bonnet 17. And a reserve seedling is mounted in the reserve seedling mounting stand 25, and the seedling supply to the planting part 40 is attained.

  In the traveling unit 10, a fertilizer application device 23 is supported on the rear portion of the vehicle body frame 14 via a support frame 22 and the like, and is disposed behind the driver seat 21 of the driving operation unit. The fertilizer application device 23 is configured to be operated by power from the engine 30 so as to perform fertilization on a farm field.

  In the planting part 40, a planting mission case is supported near the lower center of the planting frame 49, and a transmission shaft case extends from the planting mission case to the left and right sides. Four planting transmission cases 46 are respectively extended rearward from the transmission shaft case and arranged at appropriate intervals in the left-right direction.

  A rotary case 44 is rotatably supported on the left and right sides of the rear end portion of each planting transmission case 46. The number of the rotary cases 44 is the same as the number of planting strips, that is, eight in this embodiment. Then, the two planting claws 45 are attached to both sides of the rotary case 44 in the longitudinal direction so as to sandwich the rotation fulcrum of the rotary case 44.

  The seedling table 41 is disposed above the planting transmission case 46 in a tilted state with a front height and a rear height, and is attached to the rear portion of the planting frame 49 so as to be capable of reciprocating in the left-right direction via upper and lower guide rails. The seedling table 41 can be reciprocated horizontally by a lateral feed mechanism (not shown).

  The seedling mounting bases 41 having a plurality of (eight) seedling mat mounting portions are arranged in the left-right direction so that the respective lower ends face one rotary case 44. Then, the seedling mat is placed on each seedling stage 41, and one seedling can be cut from the seedling mat on the seedling stage 41 by the planting claws 45 when the rotary case 44 rotates.

  A seedling vertical feed belt 47 according to the number of strips is provided on the seedling mount 41. The seedling vertical feed belt 47 can be operated so as to vertically feed the seedling mat on the seedling stage 41 downward by the vertical feed mechanism every time the seedling stage 41 reaches the stroke end of the left and right reciprocating horizontal feed. Is done.

  The power of the engine 30 is transmitted to each rotary case 44 via a planting mission case or the like, and the rotary case 44 is configured to rotate. Thereby, with the rotation operation of the rotary case 44, the two planting claws 45 can alternately take out the seedlings from the seedling mat on the seedling mount 41 and plant them in the field.

  At the same time, the power of the engine 30 is transmitted to the horizontal feed mechanism and the vertical feed mechanism through a planting mission case or the like, and the seedling table 41 is reciprocated horizontally by the horizontal feed mechanism. Is vertically fed by the vertical feed mechanism via the seedling vertical feed belt 47 in accordance with the left and right reciprocating horizontal feed of the mounting table. Thereby, the seedling mat on the seedling placing table 41 is moved to an appropriate position with respect to the planting claws 45.

  Here, the power transmission mechanism for transmitting power from the engine 30 to the fertilizer application 23, the rotary case 44, the lateral feed mechanism, and the vertical feed mechanism includes a planting clutch, and the engine according to the connection / disconnection of the planting clutch. Is transmitted to the seedling vertical feed belt 47 and the rotary case 44 or is not transmitted.

  In the planting part 40, the left and right center floats 42 for leveling the farm scenes for the two central strips and the left and right side floats 43 for leveling the farm scenes for the two right and left strips are respectively provided in the front part. The side is supported on the planting frame 49 side so as to be movable up and down with the rear side as a rotation fulcrum, and is disposed below the planting transmission case 46.

  In the planting part 40, the drawing marker 48 is supported rotatably on both the left and right sides of the lower part of the planting frame 49. Each of the left and right line drawing markers 48 is stored by being rotated upward with the base end side as a rotation fulcrum, and the tip side is left or left by being rotated downward from this stored state. It is configured so that it can be drawn to the field by protruding rightward.

  Further, the lifting mechanism 70 described above is provided between the traveling unit 10 and the planting unit 40. Specifically, the top link 71 and the lower link 72 are installed between the traveling unit 10 and the planting unit 40, and the lifting cylinder is connected between the lower link 72 and the traveling unit 10. And the planting part 40 can be rotated to the up-down direction with respect to the traveling part 10, that is, can be raised and lowered, by the expansion and contraction operation of the lifting cylinder.

  First, the configuration of the body frame 14 will be described in detail with reference to FIG.

  The body frame 14 is mainly composed of a front frame 50 and a rear frame 52.

  A pair of left and right front main frames 53 are disposed on the front frame 50 of the vehicle body frame 14 with the longitudinal direction being the front-rear direction. The front ends of the pair of left and right front main frames 53 are connected by a front connection frame 54, and the rear ends of the pair of left and right front main frames 53 are connected by a center connection frame 51. A front bumper 56 protrudes forward from the front connection frame 54. The front bumper 56 is formed in a substantially U shape in plan view, and is disposed with the opening side facing rearward. A pair of front and rear engine mounting frames 55 to which the engine 30 is mounted is disposed in front of the pair of left and right front main frames 53. The pair of front and rear engine mounting frames 55 are formed in a substantially U-shape when viewed from the front, and the left and right ends are connected to the pair of left and right front main frames 53 with the opening side facing upward. The pair of front and rear engine mounting frames 55 are arranged at an appropriate interval in the front-rear direction.

  A pair of left and right rear main frames 57 are disposed on the rear frame 52 of the body frame 14 in a posture in which the longitudinal direction is inclined to the front low and the rear high. The front ends of the pair of left and right rear main frames 57 are connected by a center connecting frame 51, and the rear ends of the pair of left and right rear main frames 57 are connected by a rear connecting frame 58. A fuel tank frame 59 to which the fuel tank 27 is attached is disposed at a substantially right and left center of the center connection frame 51. The fuel tank frame 59 is formed in a substantially U-shape when viewed from the front, and the left and right end portions are connected to the center connecting frame 51 with the opening side facing upward, and the fuel tank frame 59 is disposed in a posture inclined forward and backward. The

  The vehicle body frame 14 having such a structure is formed as a frame having a substantially rectangular shape in plan view as a whole when the front frame 50 and the rear frame 52 of the vehicle body frame 14 are connected via the center connection frame 51. As will be described later, the vehicle body cover 18 and the bonnet 17 are attached to the vehicle body frame 14, and various devices such as the engine 30, the transmission case 60, and the fuel tank 27 are attached to predetermined positions.

  Next, the engine 30 attached to the vehicle body frame 14 and the surrounding configuration will be described in detail with reference to FIGS. 4 to 6.

  As shown in FIG. 4, the engine 30 is disposed on the front frame 50 of the vehicle body frame 14 with a crankshaft (not shown) oriented in the lateral direction, that is, the left-right direction with respect to the traveling direction of the airframe. The engine 30 is mounted on a pair of front and rear engine mounting frames 55 via an engine base 55a and a vibration isolation member. A flywheel 30a and an output pulley are fixed to the left end portion of the crankshaft of the engine 30. The engine 30 is configured to communicate with the fuel tank 27 via the fuel pipe 90 and to be supplied with fuel. As shown in FIGS. 1 and 10, the fuel tank 27 is provided on the rear frame 52 of the vehicle body frame 14 and is placed on the upper portion of the fuel tank frame 59.

  As shown in FIG. 4, a radiator 32 is disposed on the right side of the engine 30. The radiator 32 is attached to the front main frame 53 on the right side of the vehicle body frame 14 via a stay (not shown) protruding from the right front main frame 53 toward the left side. The radiator 32 cools the cooling water that circulates inside the engine 30 and includes a radiator core (not shown) made up of a large number of pipes in communication or bent pipes and fins.

  As shown in FIG. 4, a cooling fan 34 is disposed between the radiator 32 and the engine 30. The cooling fan 34 has a drive shaft that is interlocked and connected via a crankshaft, a pulley, and a belt of the engine 30 and can be driven to rotate by the crankshaft. By rotating the cooling fan 34, air outside the bonnet 17 is sucked into the bonnet 17, and the air is blown toward the engine 30 for cooling.

  As shown in FIG. 4, the radiator cover 33 is disposed around the radiator 32. The radiator cover 33 covers the front and rear of the radiator 32, a part of the left side, an upper part, and a part of the lower part. A shroud 39 formed in a cylindrical shape in the left-right direction is provided on the left side portion of the radiator cover 33. The shroud 39 is disposed so that the opening edge of the right opening is integrally fixed to the opening edge of the opening 38 formed on the left side of the radiator cover 33, and the left opening faces the engine 30. The shroud 39 efficiently guides air from the radiator 32 toward the engine 30 side by the rotational drive of the cooling fan 34 so that the air flow is not disturbed.

  As shown in FIG. 5, a mission case 60 is disposed behind the engine 30. The transmission case 60 is supported by the front frame 50 of the vehicle body frame 14 below the rear part of the pair of left and right front main frames 53. As shown in FIG. 6, the transmission case 60 mainly includes a case body 61, a steering case 62, a charge pump 64, a hydraulic continuously variable transmission 63 and the like.

  The case body 61 is a hollow member that constitutes the main outline of the mission case 60. Inside the case main body 61 is housed a sub-transmission device, a differential device, and the like including a planetary gear mechanism (not shown) and an output shaft 69 as a transmission mechanism.

  As shown in FIG. 6, the steering case 62 is fixed to the front surface of the case main body 61. A power steering device is attached to the steering case 62 in the vertical direction. An operating arm 65 projects forward from the lower end of the power steering device, and the tip of the operating arm 65 is connected to the left and right tie rods. The front wheel 15 can be steered by rotating left and right. As shown in FIG. 5, a cylindrical body 66 is fixed to the upper part of the power steering apparatus, and the steering shaft 67 of the steering handle 20 is inserted into the cylindrical body 66.

  As shown in FIG. 6, the hydraulic continuously variable transmission 63 (hereinafter referred to as “HST 63”) is fixed to the left side surface of the case main body 61. The HST 63 is provided with a transmission input shaft 68 projecting leftward. An input pulley is fixed to the left end portion of the speed change input shaft 68, and the engine output output from the engine 30 is transmitted to the HST 63 via the output pulley and the transmission belt. The HST 63 shifts the engine output transmitted to the HST 63 as appropriate, and transmits it to the traveling unit 10 and the planting unit 40 via the case main body 61.

  As shown in FIG. 6, the charge pump 64 is fixed to the right side surface of the case body 61. The charge pump 64 is a hydraulic pump that supplies hydraulic oil to the HST 63. The charge pump 64 communicates with the HST 63 via a cylindrical body 66 standing on the upper surface of the steering case 62 and a hydraulic pipe 80 formed so as to circulate in front of the steering shaft 67. Note that the arrangement of the HST 63 and the charge pump 64 is not limited to the arrangement described above. For example, the charge pump 64 may be fixed to the left side surface of the case main body 61 and the HST 63 may be fixed to the right side surface of the case main body 61.

  In such an engine 30 and the surrounding configuration, the engine 30, the radiator 32, the radiator cover 33, the cooling fan 34, the cylinder 66 standing on the upper surface of the steering case 62, and the cylinder 66 The steering shaft 67 to be inserted is surrounded by a vehicle body cover 18 attached to the upper part of the vehicle body frame 14.

  Next, the vehicle body cover 18 will be described in detail.

  As shown in FIG. 7, the vehicle body cover 18 includes a front cover 75 having a notch 75a cut out from the left and right to the rear, and a notch 76a that is cut diagonally forward so as to face each other. And a pair of left and right rear covers 76 provided with 76b. Then, by combining the notched portions 75a, 76a, and 76b with the notched sides facing each other, the surrounding portion 77 having a substantially oval shape in plan view is formed. The surrounding portion 77 is disposed on the front side of the vehicle body cover 18, and is disposed on the front frame 50 of the vehicle body frame 14 when the vehicle body cover 18 is attached to the vehicle body frame 14. Then, through the surrounding portion 77, the engine 30, the radiator 32, the radiator cover 33, the cooling fan 34, the cylinder 66 standing on the upper surface of the steering case 62, and the steering shaft 67 inserted into the cylinder 66. Are configured to project upward from the vehicle body cover 18. And as shown in FIG. 8, the part protruded upwards is comprised so that it may be covered with the bonnet 17. As shown in FIG.

  Next, the configuration of the bonnet 17 will be described in detail.

  As shown in FIG. 8, the bonnet 17 is disposed on the front cover 75 of the vehicle body cover 18. The bonnet 17 is disposed so as to surround the surrounding portion 77 of the vehicle body cover 18 at the opening edge at the lower end thereof. The bonnet 17 is a hollow member, and is formed in a tapered shape as a whole by inclining front to back and rear to high in a side view. Inside the bonnet 17, as described above, various devices such as the engine 30, the radiator 32, and the radiator cover 33 are accommodated. A dashboard 19 is disposed on the rear part of the bonnet 17. An operation panel 19 a is disposed on the upper surface of the dashboard 19. On the operation panel 19a, an operation tool such as a lever and a switch and a display device are arranged, and the steering shaft 67 protrudes upward and the steering handle 20 is fixed.

The bonnet 17 is provided with ventilation openings 17a and 17b. The ventilation openings 17a and 17b are opened in the left-right direction at the lower portions of the left and right side walls of the bonnet 17, and are formed in a horizontally long polygonal shape. A cover 26, which is a member that has air permeability such as a net and removes dust and the like, is attached to the ventilation openings 17a and 17b so as to completely cover the ventilation openings 17a and 17b. The ventilation openings 17a and 17b are air intake / exhaust openings in the bonnet 17, and allow the inside and outside of the bonnet 17 to communicate with each other. When the cooling fan 34 is driven to rotate, air is sucked into the bonnet 17 from the outside through the vent hole 17a facing the radiator 32 in the lateral direction, and a part of the sucked air faces the engine 30 in the lateral direction. It is discharged to the outside of the bonnet 17 through the vent hole 17b. That is, in the present embodiment, the right ventilation port 17a is an air intake port (ventilation inlet), and the left ventilation port 17b is an air discharge port (ventilation outlet).

  In such a configuration of the bonnet 17, the engine 30 and the radiator 32 housed in the bonnet 17 are configured to be cooled by the air sucked into the bonnet 17 by the rotational drive of the cooling fan 34. The

  Next, the cooling structure inside the bonnet 17 will be described in detail.

  As shown in FIG. 9, the air sucked into the bonnet 17 first cools the radiator 32 inside the radiator cover 33. The air after cooling the radiator 32 is blown toward the engine 30 side (outside the radiator cover 33 and inside the hood 17) through the shroud 39 of the radiator cover 33. As shown by the arrow in FIG. 9, the air blown toward the engine 30 collides with the right side surface of the engine 30, and then is shunted in the vertical and horizontal directions and circulates in the hood 17 while circulating in the hood 17. And the engine 30 is cooled.

  The air divided in the vertical and horizontal directions is pressed by the air continuously blown by the rotational drive of the cooling fan 34, and the air vent 17 b on the left side of the bonnet 17 or the surrounding portion 77 of the vehicle body cover 18. And it is discharged to the outside of the bonnet 17 through the vehicle body frame 14 formed of a frame. Note that the air discharged to the outside of the hood 17 is configured to flow toward the left side by the rotational drive of the cooling fan 34, as shown in FIG.

  Moreover, in the rice transplanter 1 which concerns on one Embodiment of this invention, the said fuel piping 90 can be cooled. The fuel pipe 90 communicates with the fuel tank 27 and supplies the fuel stored in the fuel tank 27 to the engine 30. First, a fuel path (supply line) supplied from the fuel tank 27 to the engine 30 through the fuel pipe 90 will be described. Since the fuel path (return line) returning from the engine 30 to the fuel tank 27 is provided in parallel with the supply line, the return line is cooled together with the supply line, and the description thereof is omitted.

  As shown in FIG. 10, in the supply line from the fuel tank 27 to the engine 30, the fuel is first sent from the fuel tank 27 to the first fuel filter 91. The first fuel filter 91 is disposed on the left side of the fuel tank 27. The first fuel filter 91 is for removing dust mixed in the fuel. The fuel is then sent from the first fuel filter 91 to the feed pump 92. The feed pump 92 is disposed on the left side of the fuel tank 27 and in the vicinity of the first fuel filter 91. The feed pump 92 applies pressure to the fuel and feeds the fuel toward the engine 30 side. Then, the fuel is sent from the feed pump 92 to the second fuel filter 93. The second fuel filter 93 is disposed on the left side of the engine 30 at the upper part of the center of the engine 30 in the front-rear direction. The second fuel filter 93 removes finer dust and the like than the first fuel filter 91. Then, the fuel is fed from the second fuel filter 93 to the fuel injection pump, and is injected by the fuel injection pump as a high-pressure fuel from the nozzle provided in each cylinder at a predetermined timing.

  The fuel pipe 90 connects the above-described fuel tank 27, the first fuel filter 91, the feed pump 92, and the second fuel filter 93 so as to communicate with each other. Here, a fuel pipe (hereinafter referred to as “fuel pipe 90a”) connecting the feed pump 92 and the second fuel filter 93, and a connection between the second fuel filter 93 and the fuel injection pump. The structure of the fuel pipe (hereinafter referred to as “fuel pipe 90b”) will be described.

  The fuel pipe 90a has one end side (rear side) connected to the feed pump 92 and the other end side (front side) held inside the front main frame 53 on the left side of the vehicle body frame 14 via a holding member 94. It extends towards the front. The other end side of the fuel pipe 90 a extends to the front position on the left side of the engine 30 through the left side of the engine 30 while being held by the front main frame 53. A portion that is bent upward is provided on the other end side of the fuel pipe 90a and extends to the upper portion of the engine 30 while approaching the engine 30 side. And the other end side of the fuel pipe 90a is extended by providing a portion that is bent rearward, and is disposed at the upper part of the center of the engine 30 in the front-rear direction and on the left side of the engine 30. A second fuel filter 93 is connected.

  One end side (front side) of the fuel pipe 90 b is connected to the second fuel filter 93, and the other end side (rear side) extends rearward until reaching the rear portion of the engine 30. The other end side of the fuel pipe 90 is extended by providing a portion bent toward the right side, and is connected to the fuel injection pump on the rear part of the engine 30 and at substantially the center in the left-right direction. .

  Note that the path (supply line) of fuel supplied from the fuel tank 27 to the engine 30 by the fuel pipe 90 including the fuel pipe 90a and the fuel pipe 90b is not limited to the path described above. That is, a plurality of parts are bent around the engine 30 to which the air sucked into the bonnet 17 is blown, that is, while going back and forth, left and right, or up and down around the engine 30. Any route that extends can be used.

  With such a configuration, the fuel pipe 90a (on the left side of the bonnet 17 among the fuel pipes 90a held inside the front main frame 53 on the left side of the vehicle body frame 14 via the holding member 94 ( That is, the fuel pipe 90 a) on the left side of the bonnet 17 and below the vehicle body cover 18 passes through the bonnet 17 from the inside of the bonnet 17 and through the vehicle body frame 14 formed by the surrounding portion 77 and the frame body of the vehicle body cover 18. 17 can be cooled by the air discharged to the outside. In addition, the fuel pipe 90 a and the fuel pipe 90 b disposed inside the bonnet 17 in the fuel pipe 90 a can be cooled by the air circulating inside the bonnet 17.

  Further, as described above, the fuel pipe 90 composed of the fuel pipe 90a and the fuel pipe 90b is bent at a plurality of portions around the engine 30 and goes back and forth, right and left, or up and down around the engine 30. It is extended while. That is, when the fuel pipe 90 is not provided with a plurality of such bent portions, that is, compared with the case where the fuel pipe is installed so that the distance from the fuel tank 27 to the engine 30 is substantially the shortest distance. The length of the fuel pipe 90 disposed around is set to be long. In other words, since the heat exchange area in the fuel pipe 90 is increased around the engine 30 to which the air sucked into the bonnet 17 is blown, the cooling effect of the fuel pipe 90 can be enhanced. As a result, the fuel supplied from the fuel tank 27 to the engine 30 can be cooled by the fuel pipe 90, and a decrease in the output of the engine 30 due to the high temperature of the fuel can be prevented. In addition, since the fuel supplied from the fuel pipe 90 can be cooled with an easy configuration without using a device such as a fuel cooler, the cost can be reduced.

  Moreover, in the rice transplanter 1 which concerns on one Embodiment of this invention, the said hydraulic piping 80 can be cooled.

  As shown in FIGS. 5 and 6, the hydraulic pipe 80 is formed in a substantially U shape in plan view, and is disposed so as to go around the outside of the steering case 62, with the left and right ends on the opening side facing rearward. The hydraulic continuously variable transmission 63 and the charge pump 64 are connected to each other. Specifically, one end of the hydraulic pipe 80 is connected to the charge pump 64 and extends forward from this portion. When it reaches the front of the steering case 62, it is bent and extended toward the left side. When it reaches the left side of the steering case 62, it is bent and extended toward the rear, and the other end of the hydraulic pipe 80 is extended. The side is connected to the hydraulic continuously variable transmission 63.

  With this configuration, as shown in FIG. 9B, the charge pump 64 and the hydraulic continuously variable transmission 63 are disposed inside the bonnet 17 or on the left side of the bonnet 17 and below the vehicle body cover 18. Therefore, although it was not possible to cool by the air discharged to the outside of the bonnet 17 through the surrounding body 77 of the front cover 75 of the vehicle body cover 18 and the vehicle body frame 14 formed of the frame body, the hydraulic piping 80 Therefore, the air can be cooled by the air circulated inside the hood 17.

  As described above, the rice transplanter 1 according to an embodiment of the present invention includes the engine 30 that is disposed on the body frame 14 with the crankshaft being transverse to the traveling direction of the aircraft, and the side of the engine 30. A radiator 32 disposed on one side; a radiator cover 33 covering the radiator 32; a cooling fan 34 disposed between the engine 30 and the radiator 32 and driven to rotate by the engine 30; A portion that covers the engine 30, the radiator 32, the radiator cover 33, and the cooling fan 34, and a portion that faces the radiator 32 in the lateral direction and serves as a ventilation inlet, and a portion that faces the engine 30 in the lateral direction A bonnet 17 having a ventilation air 17 b serving as a ventilation outlet and a fuel tank disposed behind the bonnet 17. In a rice transplanter including a fuel pipe 27 and a fuel pipe 90 communicating with the fuel tank 27 and the engine 30, the cooling fan 34 is driven to rotate and is sucked into the bonnet 17 through the ventilation port 17a. The air flows around the engine 30 and is exhausted to the outside of the bonnet 17 through the ventilation port 17b and the vehicle body frame 14 on which the bonnet 17 is placed. A plurality of parts are bent around.

  With such a configuration, a part of the fuel pipe 90 a disposed inside the bonnet 17 and the fuel pipe 90 b disposed entirely inside the bonnet 17 are circulated inside the bonnet 17. Can be cooled by. Further, a fuel pipe 90 a extending through the left side of the engine 30 to the front position on the left side of the engine 30 while being held by a holding member 94 inside the front main frame 53 on the left side of the body frame 14. Can be cooled (outside of the hood 17) by the air discharged to the outside of the hood 17 through the surrounding portion 77 of the body cover 18 and the body frame 14 formed of the frame.

  Further, as described above, the fuel pipe 90 composed of the fuel pipe 90a and the fuel pipe 90b is bent at a plurality of portions around the engine 30 and goes back and forth, right and left, or up and down around the engine 30. It is extended while. That is, when the fuel pipe 90 is not provided with a plurality of such bent portions, that is, compared with the case where the fuel pipe is installed so that the distance from the fuel tank 27 to the engine 30 is substantially the shortest distance. The length of the fuel pipe 90 disposed around is set to be long. In other words, since the heat exchange area in the fuel pipe 90 is increased around the engine 30 to which the air sucked into the bonnet 17 is blown, the cooling effect of the fuel pipe 90 can be enhanced. As a result, the fuel supplied from the fuel tank 27 to the engine 30 can be cooled by the fuel pipe 90, and a decrease in the output of the engine 30 due to the high temperature of the fuel can be prevented. In addition, since the fuel supplied from the fuel pipe 90 can be cooled with an easy configuration without using a device such as a fuel cooler, the cost can be reduced.

  Further, in the rice transplanter 1 according to an embodiment of the present invention, the fuel pipe 90 is held by the vehicle body frame 14, and the lateral side of the engine 30 extends from the fuel tank 27 to the front portion of the engine 30. The plurality of portions are extended from the tip portion toward the rear portion of the engine 30 while being bent.

  By adopting such a configuration, the fuel pipe 90 is used by using existing members such as the engine 30 and the body frame 14 provided in the rice transplanter 1 and skillfully using the arrangement of these members. It arrange | positions so that several site | parts may be bent around the engine 30. FIG. That is, for the installation of the fuel pipe 90, the cooling effect of the fuel pipe 90 can be enhanced to the maximum without providing an attachment member such as an attachment stay or changing the arrangement of the existing member.

  Further, the rice transplanter 1 according to an embodiment of the present invention includes a steering case 62 and a cylinder 66 (steering member) disposed behind the engine 30 and covered by the bonnet 17, and the steering case 62 and the cylinder 66. A mission case 60 disposed behind (the steering member), an HST 63 (hydraulic continuously variable transmission) disposed on the left and right sides of the mission case 60, and a charge pump 64 disposed on the other left and right sides. And a hydraulic pipe 80 communicating the HST 63 (hydraulic continuously variable transmission) and the charge pump 64. The hydraulic pipe 80 circulates in front of the steering case 62 and the cylinder body 66 (steering member). It is arranged as follows.

  With this configuration, the hydraulic pipe 80 can be cooled by the air circulating inside the bonnet. As a result, the hydraulic oil supplied from the charge pump 64 to the HST 63 can be cooled by the hydraulic pipe 80, and deterioration of the hydraulic oil can be prevented. In addition, since no hydraulic oil cooler or the like is required and the hydraulic oil supplied by the hydraulic pipe 80 can be cooled with an easy configuration, the cost can be reduced.

1 Rice transplanter 14 Body frame 17 Bonnet
17a Ventilation entrance (ventilation entrance)
17b Ventilation exit (ventilation exit)
18 Body Cover 27 Fuel Tank 30 Engine 32 Radiator 33 Radiator Cover 34 Cooling Fan 60 Mission Case 62 Steering Case 63 Hydraulic Continuously Variable Transmission (HST)
64 Charge pump 66 Cylindrical body 67 Steering shaft 77 Enclosure 80 Hydraulic piping 90 Fuel piping 91 First fuel filter 92 Feed pump 93 Second fuel filter

Claims (2)

The engine is disposed on the vehicle body frame with the crankshaft being transverse to the advancing direction of the airframe, the radiator disposed on one lateral side of the engine, and disposed between the engine and the radiator. A cooling fan that is rotationally driven by the engine, and covers the engine, the radiator, and the cooling fan, and a ventilation inlet at a portion facing the radiator in a lateral direction and a portion facing the engine in a lateral direction. In a work vehicle comprising: a bonnet having a ventilation outlet; a fuel tank disposed behind the bonnet; and a fuel pipe communicating the fuel tank and the engine;
The air sucked into the bonnet through the ventilation inlet by the rotation drive of the cooling fan flows around the engine, passes through the ventilation outlet, and the vehicle frame on which the bonnet is placed. Exhausted to
The fuel pipe is held by the vehicle body frame and extends from the fuel tank to the front side of the engine to the other side of the engine, and a plurality of portions are bent from the tip portion toward the upper side of the engine. A working vehicle that is extended while being pushed . A steering member disposed behind the engine and covered by the bonnet; a transmission case disposed behind the steering member; a hydraulic continuously variable transmission disposed on the lateral side of the transmission case; A charge pump disposed on the other side of the side; and a hydraulic pipe communicating the hydraulic continuously variable transmission and the charge pump, wherein the hydraulic pipe is arranged to circulate in front of the steering member. working vehicle according to claim 1, characterized in that it is.

Images