JP2017178246A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water from entering from an intake port into an engine intake path.SOLUTION: A work vehicle 1 includes: an engine 5 mounted on a travel machine body; a cooling fan disposed at one side part of the engine 5; and an engine hood 11 which covers the engine 5 and has vent holes on a side surface facing the cooling fan. An intake port 166 of the engine 5 is disposed facing the vent holes. A shield member 167 covering the intake port 166 in a side view is provided between the intake port 166 and the vent holes.SELECTED DRAWING: Figure 11

Description

  The present invention relates to work vehicles such as agricultural tractors, riding rice transplanters, and wheel loaders for civil engineering construction.

  In a conventional work vehicle, a technology is well known in which a cooling fan is provided on an engine mounted on a traveling machine body and the engine is cooled by cooling air generated by the rotation of the cooling fan (see, for example, Patent Document 1). Further, the bonnet that covers the engine is provided with a vent for taking outside air into the bonnet through the side surface facing the cooling fan.

JP2015-223870A

  In a configuration in which an intake port for taking in combustion air of an engine is arranged in the bonnet, the intake port is often arranged in the vicinity of a vent provided on the side surface of the bonnet. However, when the bonnet is exposed to water from the side, such as when washing a car, the air vent allows water to pass through as well as the air. There was a problem of getting into.

  This invention is made | formed in view of said present condition, and makes it the technical subject to prevent permeation of the water from the inlet port to an engine intake path.

  The present invention is a work vehicle including an engine mounted on a traveling machine body, a cooling fan disposed on one side of the engine, and a bonnet that covers the engine and has a vent on a side surface facing the cooling fan. The engine intake port is disposed opposite to the vent port, and includes a shielding member that covers the intake port when viewed from the vent port side between the intake port and the vent port. is there.

  In the present invention, for example, the air inlet may be integrally formed with a fan shroud surrounding the cooling fan, and the shielding member may be attached to the fan shroud.

  Moreover, in this invention, the example which the said inlet port is opened toward the downward direction can be mentioned.

  Further, the present invention is, for example, a configuration in which a radiator is disposed between the cooling fan and the vent, and a core portion of a hydraulic oil cooler is disposed between the vent and the radiator, An air intake port may be disposed above the radiator, and the core portion and the air intake port may be disposed at a position shifted in the horizontal direction when viewed from the vent port side.

  The work vehicle according to the present invention has an engine intake port facing the vent provided on the side surface of the bonnet, and a shielding member that covers the intake port as viewed from the vent side between the intake port and the vent port. Even if the bonnet is exposed to water from the side, the shielding member prevents water from entering the intake port and prevents water from entering the engine intake path from the intake port. be able to.

  In the work vehicle of the present invention, if the air inlet is integrally formed with the fan shroud that surrounds the cooling fan, and a shielding member is attached to the fan shroud, a member for supporting the shielding member is separately provided. Since it is not necessary, the number of parts and the manufacturing cost can be reduced, and the shielding member can be easily attached.

  Further, in the work vehicle of the present invention, if the intake port is opened downward, water can be more reliably prevented from entering the intake port from the side.

  Further, the work vehicle of the present invention has a configuration in which, for example, a radiator is disposed between the cooling fan and the vent, the core portion of the hydraulic oil cooler is disposed between the vent and the radiator, and the intake port is If it is arranged above the radiator and the core part and the intake port are arranged in a horizontal position when viewed from the vent side, the heat generated by staying in the hydraulic oil cooler It is possible to prevent direct suction. Thereby, regarding the combustion air taken in from the intake port, it is possible to suppress the temperature rise caused by the heat generation of the hydraulic oil cooler, and thus the engine output can be prevented from decreasing.

It is a left view of the riding type rice transplanter in the embodiment. It is a top view of a riding type rice transplanter. It is a left view of a traveling body. It is a top view of a traveling body. It is a top view of the driving operation part which abbreviate | omitted the steering handle. It is a drive system figure of a riding type rice transplanter. It is a hydraulic circuit diagram of a riding type rice transplanter. It is front sectional drawing of a traveling machine body front part. It is an expansion right view of an engine and a transmission case. It is an expansion right side view of a bonnet. It is an expansion right side view inside a bonnet. It is a perspective view which shows a radiator and a fan shroud periphery. It is a top view which shows a hydraulic-oil path with a fan shroud and an air cleaner. It is a top view which shows a fan shroud and an intake pipe in a partial cross section. It is an enlarged right side surface around the inlet.

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings when applied to an eight-row planting type rice transplanter 1 (hereinafter, simply referred to as a rice transplanter 1) as a work vehicle. In the following description, the left side in the traveling direction of the traveling machine body 2 is simply referred to as the left side, and the right side in the traveling direction is also simply referred to as the right side.

  First, the outline | summary of the rice transplanter 1 is demonstrated, referring FIGS. 1-4. The rice transplanter 1 according to the embodiment includes a traveling machine body 2 supported by a pair of left and right front wheels 3 and a pair of left and right rear wheels 4 as a traveling unit. An engine 5 is mounted on the front portion of the traveling machine body 2. Power from the engine 5 is transmitted to the rear transmission case 6 to drive the front wheels 3 and the rear wheels 4 so that the traveling machine body 2 travels forward and backward. A front axle case 7 projects from the left and right sides of the transmission case 6, and the front wheels 3 are attached to a front axle 36 extending from the front axle case 7 to the left and right so as to be steerable. A cylindrical frame 8 protrudes behind the transmission case 6, a rear axle case 9 is fixed to the rear end side of the cylindrical frame 8, and the rear wheel 4 is attached to a rear axle 37 that extends outward from the rear axle case 9 to the left and right. ing.

  As shown in FIGS. 1 and 2, an operator boarding work step (vehicle body cover) 10 is provided on the upper surface side of the front part and the center part of the traveling machine body 2. A bonnet 11 is disposed above the front part of the work step 10, and the engine 5 is installed inside the bonnet 11. A travel speed change pedal 12 for stepping operation is disposed on the upper side of the work step 10 on the rear side of the bonnet 11. Although details are omitted, the rice transplanter 1 according to the embodiment adjusts the shift power output from the hydraulic continuously variable transmission 40 of the transmission case 6 by driving the variable speed electric motor according to the depression amount of the travel shift pedal 12. Is configured to do.

  In addition, a steering handle 14, a traveling main transmission lever 15, and a work lever 16 as a lifting operation tool are provided in the driving operation unit 13 on the rear upper surface side of the bonnet 11 (see FIG. 5). A steering seat 18 is disposed behind the bonnet 11 on the upper surface of the work step 10 via a seat frame 17. Note that left and right spare seedling platforms 24 are provided on the left and right sides of the bonnet 11 with the operation step 10 interposed therebetween.

  A link frame 19 is erected at the rear end of the traveling machine body 2. An eight-row seedling planting device 23 is connected to the link frame 19 via an elevating link mechanism 22 including a lower link 20 and a top link 21 so as to be elevable. In this case, a hitch bracket 38 is provided on the front side of the seedling planting device 23 via a rolling fulcrum shaft (not shown). By connecting a hitch bracket 38 to the rear side of the lifting link mechanism 22, the seedling planting device 23 is disposed behind the traveling machine body 2 so as to be movable up and down. The cylinder base end side of the hydraulic lift cylinder 39 is supported on the rear upper surface of the cylindrical frame 8 so as to be vertically rotatable. The rod tip side of the lifting cylinder 39 is connected to the lower link 20. As a result of vertically moving the lifting link mechanism 22 by the expansion and contraction of the lifting cylinder 39, the seedling planting device 23 moves up and down. Note that the seedling planting device 23 is configured to be rotatable about the rolling fulcrum axis so as to be able to change the inclined posture in the left-right direction.

  The operator gets on the work step 10 from the boarding / alighting step 25 on the side of the work step 10 and drives the seedling planting device 23 to move the seedling planting device 23 and move the seedling planting in the field while moving in the field by the driving operation. Perform work (rice planting work). During the seedling planting operation, the operator replenishes the seedling planting device 23 with a seedling mat on the preliminary seedling mounting table 24 as needed.

  As shown in FIGS. 1 and 2, the seedling planting device 23 includes a planting input case 26 to which power is transmitted from the engine 5 via the mission case 6, and four sets of eight strips connected to the planting input case 26. Planting transmission case 27 (one set in Nijo), seedling planting mechanism 28 provided on the rear end side of each planting transmission case 27, seedling mount 29 for eight-row planting, and each planting transmission case 27 And a float 32 for uniforming the surface of the surface. The seedling planting mechanism 28 is provided with a rotary case 31 having two planting claws 30 for one line. Two rotary cases 31 are arranged in the planting transmission case 27. By one rotation of the rotary case 31, the two planting claws 30 cut out and grasp one seedling each, and plant it on the field leveled by the float 32. On the front side of the seedling planting device 23, a leveling rotor 85 as a leveling device for leveling (leveling) the farm scene is provided so as to be movable up and down.

  Although details will be described later, the power from the engine 5 via the transmission case 6 is transmitted not only to the front wheels 3 and the rear wheels 4, but also to the planting input case 26 of the seedling planting device 23. In this case, the power from the transmission case 6 toward the seedling planting device 23 is once transmitted to the inter-plant transmission case 75 provided on the upper right side of the rear axle case 9, and is transmitted from the inter-plant transmission case 75 to the planting input case 26. The The seedling planting mechanism 28 and the seedling mount 29 are driven by the transmitted power. The inter-strain shifting case 75 includes an inter-strain shifting mechanism 76 that switches between planted seedlings to, for example, sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the planting planting device 23. (See FIG. 6).

  A side marker 33 is provided on the left and right outside of the seedling planting device 23. The side marker 33 includes a marker ring body 34 for muscle pulling and a marker arm 35 that pivotally supports the marker ring body 34 so as to be rotatable. The base end side of each marker arm 35 is pivotally supported on the left and right outer sides of the seedling planting device 23 so as to be rotatable left and right. The side marker 33 is moved away from the surface by raising the marker wheel body 34 based on the operation posture of the operation lever 16 in the driving operation unit 13 and forming a trajectory as a reference in the next process by landing on the surface. The non-working posture is configured to be rotatable.

  As shown in FIGS. 3 and 4, the traveling machine body 2 includes a pair of left and right machine body frames 50 extending in the front-rear direction. Each body frame 50 is divided into a front frame 51 and a rear frame 52. The rear end portion of the front frame 51 and the front end portion of the rear frame 52 are welded and fixed to a laterally long intermediate connection frame 53. The front ends of the pair of left and right front frames 51 are fixed to the front frame 54 by welding. The rear end sides of the left and right rear frames 52 are fixed to the rear frame 55 by welding. The front frame 54, the left and right front frames 51, and the intermediate connection frame 53 are configured in a square frame shape in plan view. Similarly, the intermediate connection frame 53, the left and right rear frames 52, and the rear frame 55 are also configured in a square frame shape in plan view.

  As shown in FIG. 4, the front portions of the left and right front frames 51 are connected by two front and rear base frames 56. An intermediate portion of each base frame 56 is formed in a shape bent into a U shape so as to be positioned lower than the left and right front frames 51. The left and right end portions of each base frame 56 are fixed to the corresponding front frame 51 by welding. The engine 5 is mounted on and supported by the front and rear base frames 56 via a plurality of vibration isolating rubbers 58. The front base frame 56 is connected to the front frame 54 via a front relay frame 59 fixedly welded thereto. The rear base frame 56 is connected to the front portion of the transmission case 6 via a rear relay bracket 60 (see FIG. 9).

  As can be seen from FIG. 4, the rear portions of the left and right front frames 51 are connected to a front axle case 7 projecting from the left and right sides of the mission case 6. The left and right ends of a U-shaped frame 61 extending rearward and obliquely downward in a side view are welded and fixed to the center side of the intermediate connection frame 53. The middle part of the U-shaped frame 61 is connected to the middle part of the cylindrical frame 8 that connects the transmission case 6 and the rear axle case 9 (see FIGS. 3 and 4). The upper ends of the two left and right link frames 19 are welded and fixed to the middle portion of the rear frame 55. An intermediate portion of a horizontally elongated rear axle support frame 63 is fixed to the lower ends of the left and right link frames 19 by welding. The left and right ends of the rear axle support frame 63 are connected to the rear axle case 9. A muffler 65 for reducing the exhaust noise of the engine 5 is disposed below the step support base 64 projecting outward from the left front frame 51.

  As shown in FIGS. 3 and 4, a power steering unit 66 is provided at the front portion of the transmission case 6 disposed behind the engine 5. Although details are omitted, a handle shaft is rotatably disposed inside a handle post 67 standing on the upper surface of the power steering unit 66. A steering handle 14 is fixed to the upper end side of the handle shaft. On the lower surface side of the power steering unit 66, a steering output shaft (not shown) protrudes downward. A steering rod 68 (see FIG. 4) for steering the left and right front wheels 3 is connected to the steering output shaft.

  The engine 5 of the embodiment is disposed on an intermediate portion of the front and rear base frames 56 with the output shaft 70 (crank shaft) directed in the left-right direction. The left and right widths of the engine 5 are smaller than the internal dimensions between the left and right front frames 51, and the lower side of the engine 5 is disposed on the middle part of the front and rear base frames 56, and the left and right front frames 51 It is exposed to the lower side. In this case, the output shaft 70 (axis line) of the engine 5 is in a position overlapping the left and right front frames 51 in a side view. An exhaust pipe 69 communicating with the exhaust system of the engine 5 is disposed on one of the left and right side surfaces (left side surface in the embodiment) of the engine 5. The proximal end side of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the distal end side of the exhaust pipe 69 is connected to the exhaust inlet side of the muffler 65.

  In the driving operation unit 13 shown in FIG. 5, the traveling main transmission lever 15 is located on one of the left and right sides (left side in the embodiment) with the steering handle 14 in between. By operating the traveling main speed change lever 15 along the guide groove 83 formed in the driving operation unit 13, the traveling mode of the rice transplanter 1 is switched to forward, neutral, backward, seedling and movement modes. ing. The work lever 16 is located on the left and right other side (right side in the embodiment) across the steering handle 14. The work lever 16 independently performs a plurality of operations such as raising / lowering the seedling planting device 23, switching operation of the planting clutch 77, and selection operation of the left and right side markers 33, and is configured to be operable in the cross direction. ing.

  In this case, if the operation lever 16 is tilted forward once, the seedling planting device 23 is lowered, and if it is tilted forward once again, the planting clutch 77 is engaged and activated (becomes a power connection state). Conversely, when the operation lever 16 is tilted once backward, the planting clutch 77 is turned off (becomes in a power cut-off state), and when it is tilted again once, the seedling planting device 23 is raised. When stopping the raising / lowering operation of the seedling planting device 23, the operation lever 16 is tilted in the reverse direction. For example, when the lowering movement of the seedling planting device 23 is stopped halfway, the work lever 16 may be tilted backward. When the work lever 16 is tilted once to the left, the left side marker 33 is in the working position, and when it is tilted left again, the left side marker 33 is returned to the non-working position. When the work lever 16 is tilted to the right once, the right side marker 33 is in the working position, and when the work lever 16 is tilted to the right again, the right side marker 33 is returned to the non-working position.

  Next, the drive system of the rice transplanter 1 will be described with reference to FIG. The output shaft 70 of the engine 5 protrudes outward from the left and right side surfaces of the engine 5. An engine output pulley 72 is provided at the protruding end of the output shaft 70 that protrudes from the left side of the engine 5, a mission input pulley 73 is provided at the mission input shaft 71 that protrudes outward from the mission case 6, and is transmitted to both pulleys 72, 73. A belt 82 is wound around. Power is transmitted from the engine 5 to the transmission case 6 via both pulleys 72 and 73 and the transmission belt 82.

  In the transmission case 6, the transmission power through the hydraulic continuously variable transmission 40, the planetary gear device 41, the hydraulic continuously variable transmission 40, and the planetary gear device 41 including the hydraulic pump 40 a and the hydraulic motor 40 b is shifted to a plurality of stages. A gear-type sub-transmission mechanism 42, a main clutch 43 that interrupts power transmission from the planetary gear unit 41 to the gear-type sub-transmission mechanism 42, a traveling brake 44 that brakes the output from the gear-type sub-transmission mechanism 42, and the like. ing. The hydraulic pump 40a is driven by power from the mission input shaft 71, hydraulic oil is supplied from the hydraulic pump 40a to the hydraulic motor 40b, and variable speed power is output from the hydraulic motor 40b. The speed change power of the hydraulic motor 40 b is transmitted to the gear type subtransmission mechanism 42 via the planetary gear device 41 and the main clutch 43. Then, power is transmitted from the gear-type sub-transmission mechanism 42 by branching in the two directions of the front and rear wheels 3 and 4 and the seedling planting device 23.

  Part of the branching power toward the front and rear wheels 3 and 4 is transmitted from the gear-type auxiliary transmission mechanism 42 via the differential gear mechanism 45 to the front axle 36 of the front axle case 7 to drive the left and right front wheels 3 to rotate. . The remainder of the branching power toward the front and rear wheels 3, 4 is transferred from the gear-type sub-transmission mechanism 42 through the universal joint shaft 46, the rear drive shaft 47 in the rear axle case 9, a pair of left and right friction clutches 48, and a gear-type reduction mechanism 49. Thus, the rear axle case 9 is transmitted to the rear axle 37 to drive the left and right rear wheels 4 to rotate. When the traveling brake 44 is operated, the output from the gear-type subtransmission mechanism 42 is lost, so that the front and rear wheels 3 and 4 are braked. When the rice transplanter 1 is turned, the friction clutch 48 inside the turning inside the rear axle case 9 is turned off to rotate the rear wheel 4 inside the turning freely, and the rotation of the rear wheel 4 outside the turning to which power is transmitted is rotated. It turns by driving.

  A rotor drive unit 86 having a leveling clutch 84 for power transmission to the leveling rotor 85 is provided in the rear axle case 9. The power transmitted from the gear-type subtransmission mechanism 42 to the universal joint shaft 46 is also branched and transmitted to the rotor drive unit 86, and is transmitted from the rotor drive unit 86 to the leveling rotor 85 via the universal joint shaft 87. The farm scene is leveled by the rotational drive of the leveling rotor 85.

  The branching power toward the seedling planting device 23 is transmitted to the inter-strain transmission case 75 via the PTO transmission shaft mechanism 74 with a universal joint shaft. In the inter-strain shifting case 75, an inter-strain shifting mechanism 76 that switches between seedlings to be planted, for example, to sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the planting planting device 23 are provided. I have. The power transmitted to the inter-plant transmission case 75 is transmitted to the planting input case 26 via the inter-plant transmission mechanism 76, the planting clutch 77, and the universal joint shaft 78.

  In the planting input case 26, a lateral feed mechanism 79 that moves the seedling platform 29 laterally, a seedling vertical feed mechanism 80 that transports the seedling mat on the seedling platform 29 longitudinally, and the planting input case 26. A planting output shaft 81 that transmits power to each planting transmission case 27 is provided. By the power transmitted to the planting input case 26, the lateral feed mechanism 79 and the seedling vertical feed mechanism 80 are driven, and the seedling stage 29 is continuously reciprocally moved in the lateral direction. The seedling mat on the seedling table 29 is intermittently transported vertically when reaching the turning point of the reciprocating movement. Power from the planting input case 26 via the planting output shaft 81 is transmitted to each planting transmission case 27, and the rotary case 31 and the planting claw 30 of each planting transmission case 27 are driven to rotate. In addition, when providing a fertilizer, motive power is transmitted from the inter-strain transmission case 75 to a fertilizer.

  Next, the hydraulic circuit structure of the rice transplanter 1 will be described with reference to FIG. The hydraulic circuit 90 of the rice transplanter 1 includes a hydraulic pump 40 a and a hydraulic motor 40 b that are components of the hydraulic continuously variable transmission 40, a charge pump 91, and a work pump 92. The hydraulic pump 40a, the charge pump 91, and the work pump 92 are driven by the power of the engine 5. The hydraulic pump 40 a and the hydraulic motor 40 b are connected to the respective suction side and discharge side via a closed loop oil passage 93. A charge pump 91 is connected to the closed loop oil passage 93. The swash plate angle of the hydraulic pump 40a is adjusted by driving the speed change electric motor according to the depression amount of the travel speed change pedal 12, and the hydraulic motor 40b is driven forward or reverse. The hydraulic oil discharged from the charge drain joint 121 (see FIG. 13) of the hydraulic continuously variable transmission 40 is returned to the inside of the transmission case 6 from the hydraulic oil return joint 123 (see FIG. 13) via the hydraulic oil cooler 122.

  The work pump 92 is connected to a power steering unit 66 that assists the operation of the steering handle 14. The power steering unit 66 includes a steering hydraulic pressure switching valve 94 and a steering hydraulic motor 95. By operating the steering handle 14, the steering hydraulic pressure switching valve 94 is switched to drive the steering hydraulic motor 95 to assist the operation of the steering handle 14. As a result, the left and right front wheels 3 can be easily steered with a small operating force.

  The power steering unit 66 is connected to the flow divider 96. The flow divider 96 is branched into a first oil passage 97 and a second oil passage 98. The first oil passage 97 is connected to a lift switching valve 99 that supplies hydraulic oil to the lift cylinder 39. The elevation switching valve 99 is a four-port two-position switching type mechanical switching that can be switched between a supply position 99a for supplying hydraulic oil to the elevation cylinder 39 and a discharge position 99b for discharging hydraulic oil from the elevation cylinder 39. It is a valve. The seedling planting device 23 moves up and down via the lifting link mechanism 22 by operating the work lever 16 to switch the lifting switching valve 99 to expand and contract the lifting cylinder 39. The flow divider 96 and the up / down switching valve 99 are accommodated in a valve unit 89 provided at the rear of the mission case 6.

  An electromagnetic on-off valve 101 is provided in a cylinder oil passage 100 from the up / down switching valve 99 to the up / down cylinder 39. The electromagnetic on-off valve 101 is an electromagnetic control valve that can be switched between two positions: an open position 101a for supplying and discharging hydraulic oil to and from the lift cylinder 39 and a closed position 101b for stopping supply and discharge of hydraulic oil to and from the lift cylinder 39. is there. Accordingly, when the electromagnetic solenoid 102 is excited to open the electromagnetic on-off valve 101 to the open position 101a, the lifting cylinder 39 can be expanded and contracted, and the seedling planting device 23 can be moved up and down. When the electromagnetic solenoid 102 is de-energized and the electromagnetic on-off valve 101 is moved to the closed position 101b by the return spring 103, the elevating cylinder 39 is held so as not to expand and contract, and the seedling planting device 23 stops elevating at an arbitrary height position.

  An accumulator 105 is connected between the electromagnetic on-off valve 101 and the lift cylinder 39 in the cylinder oil passage 100 via an accumulator oil passage 104. When the operating hydraulic pressure in the elevating cylinder 39 changes suddenly, the operating hydraulic pressure fluctuation is absorbed by the accumulator 105, and the elevating cylinder 39 is smoothly expanded and contracted by the combination of the elevating switching valve 99 and the electromagnetic on-off valve 101, so The device 23 is moved up and down easily.

  The second oil passage 98 of the flow divider 96 is connected to a rolling control unit 106 that controls the right / left inclined posture of the seedling planting device 23. The rolling control unit 106 incorporates an electromagnetic control valve 107 that supplies hydraulic oil to the rolling cylinder 108. As a result of operating the rolling cylinder 108 provided integrally with the rolling control unit 106 by the switching operation of the electromagnetic control valve 107, the seedling planting device 23 is held in a horizontal posture. The hydraulic circuit 90 of the rice transplanter 1 also includes a relief valve, a flow rate adjustment valve, a check valve, an oil filter, and the like.

  Next, the internal structure of the bonnet 11 will be described with reference to FIGS. A vent 200 having an upper vent 201 and a lower vent 202 is opened on each of the left and right side surfaces of the bonnet 11. In the vent 200, the upper vent 201 and the lower vent 202 are arranged vertically. A mesh member 203 that covers the upper vent 201 and the lower vent 202 from the inside of the bonnet 11 is attached to the left and right parts of the bonnet 11 on the inner wall of the bonnet 11. The mesh member 203 has a large number of holes and allows air to flow between the inside and the outside of the bonnet 11.

  A cooling fan 152 that is rotated by the power of the engine 5 is disposed on the right side (one side) of the engine 5 disposed in the hood 11. The cooling fan 152 is disposed to face the vent hole 200 on the right side of the bonnet 11. An engine 5 water-cooling radiator 153, which is an example of a heat exchanger, is disposed between the cooling fan 152 and the vent 200 on the right side of the cooling fan 152. A fan shroud 154 that surrounds the cooling fan 152 is disposed between the radiator 153 and the engine 5. That is, the cooling fan 152 is positioned at the opening of the fan shroud 154, and the cooling fan 152 is opposed to the radiator 153. In addition, a fin portion 153a in which a plurality of heat dissipating fins are arranged so that air flows in the radiator 153, a part thereof, in this embodiment, an upper front portion and an upper central portion are opposed to the vent hole 200, and a large portion thereof. The part faces the lower vent 202.

  Inside the bonnet 11, a substantially box-shaped bonnet frame 155 surrounding the engine 5 is connected to the front frame 54 and the handle post 67. A front shroud bracket 156 for fixing the upper front portion of the fan shroud 154 with a bolt and a rear shroud bracket 157 for fixing the upper rear portion of the fan shroud 154 to the bonnet frame 155 are fixed. Further, the radiator 153 is supported at both lower end portions by a pair of radiator brackets 158 fixed to the front portion of the right front frame 51 and is fastened to the fan shroud 154 by bolts. Thus, the radiator 153 and the fan shroud 154 are supported by the right front frame 51 and the hood frame 155 in the hood 11.

  Also, a mudguard member 159 that prevents adhesion of mud scattered from the front wheels 3 is bolted to the front radiator bracket 158 of the pair of radiator brackets 158. The mudguard member 159 covers the front lower part of the fan shroud 154, and a part of the mudguard member 159 is inserted into a slit provided on the front side surface of the fan shroud 154. The mudguard member 159 prevents the mud scattered from the front wheels 3 from adhering to the radiator 153.

  In the bonnet 11, an air cleaner 160 is disposed above the engine 5. The air cleaner 160 is mounted on an air cleaner bracket 161 that is bolted to the upper portion of the engine 5, for example, the upper surface of the cylinder head cover, and fixing belts 162 that are detachably attached to the air cleaner bracket 161 are attached to the outer periphery of the air cleaner 160. It is wound and fixed in position. The air cleaner 160 is connected to one end side of an intake pipe 163 for taking in air and one end side of a supply pipe 164 that supplies air to the engine 5 after purifying the air from the intake pipe 163 in the air cleaner 160. The other end of the supply pipe 164 is connected to a fresh air intake port of the engine 5, for example, an intake manifold.

  The other end of the intake pipe 163 is connected to an intake port forming portion 165 formed integrally with the fan shroud 154. The intake port formation portion 165 is formed to bulge from the surface on the engine 5 side of the fan shroud 154 toward the surface on the radiator 153 side above the radiator 153 storage position, and is formed in a concave shape when viewed from the engine 5 side. . The intake port forming portion 165 has a substantially cylindrical shape, and is formed at a position closer to the rear in the upper region of the radiator 153. The intake port forming portion 165 has an intake port 166 on the outer peripheral side surface thereof. The intake port 166 is formed by opening approximately half of the contour when viewed from the cylindrical central axis direction of the intake port formation portion 165 toward the lower side, in this embodiment, diagonally forward and lower. The substantially circular bulging end surface of the intake port forming portion 165 is closed. The intake port forming portion 165 and the intake port 166 are disposed so as to face the vent 200, in this embodiment, the upper vent 201. By inserting the end of the intake pipe 163 into the intake port forming portion 165 from the engine 5 side, the intake port 166 and the air cleaner 160 are circulated and connected via the intake pipe 163.

  The intake port forming portion 165 is provided with an outer peripheral side surface portion connecting the proximal end side portion of the intake port forming portion 165 and the bulging end surface so as to divide the intake port 166 into two parts. The strength of has been improved. In addition, the outer peripheral side surface of the intake port forming portion 165 is connected to a rib portion that is protruded and formed on the radiator 153 side at the peripheral portion of the fan shroud 154, so that the strength of the intake port forming portion 165 is improved.

  For example, a plate-shaped shielding member 167 is attached to the bulging end surface of the intake port forming portion 165. The shielding member 167 is fixed to two portions of the bulging end surface of the intake port forming portion 165 by two fixing screws 168, and is between the intake port 166 and the vent port 200, in this embodiment, the intake port 166 and the upper vent. Arranged between the mouths 201. The shielding member 167 is disposed so as to protrude forward and downward with respect to the bulging end surface of the intake port formation portion 165, and covers the intake port 166 when viewed from the right side. On the outer peripheral side surface of the intake port forming portion 165, two rib portions extending from the base end portion to the bulging end surface are formed so as to protrude in the outer peripheral direction corresponding to the mounting position of the fixing screw 168. These rib portions secure the mounting position of the fixing screw 168 and improve the strength of the intake port forming portion 165.

  As shown in FIGS. 8 and 10 to 15, the core portion 124 of the hydraulic oil cooler 122 is disposed between the vent 200 on the right side of the bonnet 11 and the radiator 153. The core portion 124 is composed of a meandering pipe that meanders in the vertical direction, for example, and is disposed so as to face the center portion from the front portion of the radiator 153. In the hydraulic oil cooler 122, two mounting stays 125, 125 that extend in the front-rear direction and are spaced apart from each other in the vertical direction are fixed to the surface of the core portion 124 on the radiator 153 side. The core portion 124 is supported by the radiator 153 by fixing both ends of the mounting stays 125, 125 to both ends of the radiator 153. As shown in FIG. 11, the core portion 124 and the air inlet 166 are disposed at positions shifted in the horizontal direction when viewed from the vent 200 side on the right side surface of the bonnet 11.

  As shown in FIGS. 10 to 13, the hydraulic oil inlet side of the core portion 124 of the hydraulic oil cooler 122 is connected to the charge drain joint of the hydraulic continuously variable transmission 40 via the hydraulic oil feed pipe 126 and the hydraulic oil feed tube 127. 121 is connected. The hydraulic oil outlet side of the core portion 124 is connected to the hydraulic oil return joint 123 of the mission case 6 via the hydraulic oil return pipe 128 and the hydraulic oil return tube 129. By the operation of the charge pump 91 (see FIG. 7), the hydraulic oil in the transmission case 6 is converted into the hydraulic continuously variable transmission 40, the charge drain joint 121, the hydraulic oil feed tube 127, the hydraulic oil feed pipe 126, and the hydraulic oil cooler 122. Are circulated and cooled through the core portion 124, the hydraulic oil return pipe 128, and the hydraulic oil return tube 129.

  In the riding-type rice transplanter 1 of this embodiment, the air intake 166 of the engine 5 is disposed opposite to the air vent 200 provided on the right side surface of the bonnet 11, and the air vent is provided between the air intake 166 and the air vent 200. A shielding member 167 that covers the intake port 166 when viewed from the mouth 200 side is provided. Thereby, even if the bonnet 11 is in a state where water is applied from the right side, the shielding member 167 prevents water from entering the intake port 166, and the intake path of the engine 5 such as the intake pipe 163, the air cleaner 160, and the supply pipe 164. It is possible to prevent water from entering from the air inlet 166.

  Further, in the riding type rice transplanter 1 of this embodiment, the air inlet 166 is integrally formed with the fan shroud 154 surrounding the cooling fan 152, and the shielding member 167 is attached to the fan shroud 154. Therefore, since it is not necessary to provide a member for supporting the shielding member 167 separately from the fan shroud 154, the number of parts and manufacturing cost can be reduced, and the shielding member 167 can be easily attached.

  Moreover, in the riding type rice transplanter 1 of this embodiment, the intake port 166 is opened diagonally forward and downward. Therefore, even in a situation where water is applied from the right side of the bonnet 11 toward the vent hole 200, in addition to the effect of preventing water from entering the intake port 166 by the shielding member 167, the water to the intake port 166 is more reliably secured. Can be prevented.

  Further, in the riding type rice transplanter 1 of this embodiment, the core portion 124 of the hydraulic oil cooler 122 is disposed between the vent 200 on the right side of the bonnet 11 and the radiator 153, and the intake port 166 is disposed above the radiator 153. Has been. Further, the core portion 124 and the air inlet 166 are disposed at positions shifted in the horizontal direction when viewed from the vent 200 side on the right side surface of the bonnet 11. Therefore, the heat generated by staying in the hydraulic oil cooler 122, particularly the core portion 124, can be prevented from being directly sucked into the intake port 166. Thereby, regarding the combustion air taken in from the intake port 166, the temperature rise caused by the heat generation of the hydraulic oil cooler 122 can be suppressed, and consequently the decrease in the output of the engine 5 can be suppressed.

  Further, the air vent 200 on the right side of the bonnet 11 is divided into an upper air vent 201 and a lower air vent 202, and the air inlet 166 faces the upper air vent 201, and the core portion 124 faces the lower air vent 202. Confronted. Further, in the fin portion 153 a through which air flows in the radiator 153, the upper front portion and the upper central portion of the fin portion 153 a are opposed to the vent 200, and most of the fin portion 153 a is opposed to the lower vent 202. Further, the air flowing into the hood 11 from the vent 200 on the right side surface of the bonnet 11 by the operation of the cooling fan 152 circulates to the engine 5 side through the fin portion 153a of the radiator 153 and the fan shroud 154. Accordingly, air can flow from the upper vent 201 on the right side surface of the bonnet 11 toward the fin portion 153a obliquely downward to the left, so that the intake port 166 is disposed above the radiator 153, thereby radiating at the hydraulic oil cooler 122. It is possible to prevent the generated heat from being directly sucked into the intake port 166.

  The present invention is not limited to the above-described embodiment, and can be embodied in various forms. The configuration of each part is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the work vehicle of the present invention can be applied not only to a riding type rice transplanter but also to other work vehicles such as an agricultural tractor and a wheel loader for civil engineering construction.

1 Passenger rice transplanter (work vehicle)
2 traveling machine body 5 engine 11 bonnet 122 hydraulic oil cooler 124 core portion 152 cooling fan 153 radiator 154 fan shroud 166 air inlet 167 shielding member 200 air vent

Claims (4)

An engine mounted on a traveling machine, a cooling fan disposed on one side of the engine, and a work vehicle including a bonnet that covers the engine and has a vent on a side facing the cooling fan,
A work vehicle provided with a shielding member that is disposed so that an intake port of the engine faces the vent and covers the intake port as viewed from the vent side between the intake port and the vent.   The work vehicle according to claim 1, wherein the intake port is integrally formed with a fan shroud surrounding the cooling fan, and the shielding member is attached to the fan shroud.   The work vehicle according to claim 1, wherein the intake port is opened downward. A radiator is disposed between the cooling fan and the vent hole,
The core portion of the hydraulic oil cooler is disposed between the vent and the radiator, the intake port is disposed above the radiator, and the core portion and the intake port are horizontal when viewed from the vent side. The work vehicle according to any one of claims 1 to 3, wherein the work vehicle is disposed at a position shifted in a direction.

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