JP2020023317A - Work machine - Google Patents

Abstract

To provide a work machine which achieves improvement of maintainability for a radiator while inhibiting warm air heated by heat of an engine from coming around to a suction side of the radiator.SOLUTION: A work machine 1 includes: a traveling machine body on which an engine is mounted; an engine hood 11 which may open or close the engine; a radiator 153 disposed at a side of one side part of the engine within the engine hood 11; a shroud 154 provided at an outer periphery of the radiator 153; and shielding members 146, 147 which close a gap between the shroud 154 and the engine hood 11. The first shielding member 146 is attached to a peripheral wall part of the shroud 154 and is terminated in an area above a water supply port part 142 of the radiator 153. The second shielding member 147 is attached to the engine hood 11a so as to be brought into contact with a terminated portion of the first shielding member 146 when the engine hood 11a is closed.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a working machine.

  In a conventional working machine, a configuration in which a cooling fan, a shroud, and a radiator are arranged in this order from an engine side in an openable / closable hood surrounding an engine mounted on a traveling machine body is well known (for example, see Patent Document 1). ). In such a configuration, when the warm air in the bonnet heated by the heat of the engine passes through the gap between the shroud and the bonnet to the suction side of the radiator, the cooling efficiency of the radiator and the engine is reduced, so that the shroud and the bonnet are reduced. Is closed with a shielding member. In the related art disclosed in Patent Literature 1, the upper end of the shroud extends upward, and a shielding member (trim) that contacts the inner surface of the hood is attached to the upper end of the shroud.

JP 2016-32966 A

  By the way, the shroud arranged between the cooling fan and the radiator surrounds the outer periphery of the radiator including the upper part of the radiator in order to suppress the warm air heated by the heat of the engine from flowing to the suction side of the radiator. Is preferred. However, when the shielding member is attached to the shroud so as to surround the outer periphery of the radiator, there is a problem in that the shielding member becomes an obstacle during maintenance work on the radiator such as, for example, cooling water replenishment work, and the maintainability deteriorates. Also, if a part of the shielding member is cut and cut off to improve maintainability with respect to the radiator, the warm air heated by the engine heat flows through the cut off part of the shielding member to the radiator suction side and cools down. There is a problem that the efficiency is reduced.

  The present invention has been made in view of the above situation, and it is a technical object of the present invention to improve the maintainability of a radiator while suppressing warm air heated by engine heat from flowing to a radiator suction side. And

  The present invention relates to a traveling body equipped with an engine, an openable / closable hood covering the engine, a radiator arranged on one side of the engine in the hood, a shroud provided on the outer periphery of the radiator, and a shroud and a bonnet. A work machine provided with a shielding member that closes a gap between the first shielding member, the first shielding member being attached to a peripheral wall of the shroud and being cut off above a water supply port of the radiator; A second shielding member which is attached to the hood and which comes into contact with the disconnected portion of the first shielding member when the hood is in a closed state.

  In the working machine of the present invention, for example, the peripheral wall portion includes a concave portion in which an upper portion of the water supply port portion of the radiator is cut out, and the first shielding member is configured such that the cutoff portion is located in the concave portion. The second shielding member may be attached to the peripheral wall, and may contact the concave portion of the peripheral wall when the hood is in a closed state.

  Further, in the working machine of the present invention, for example, a vent hole facing the shroud and the radiator is formed on one of the left and right sides of the hood with the traveling direction of the traveling machine body in the front-rear direction, and when the hood is in a closed state. Wherein the first shielding member is in contact with the inner surface of the left and right side portions of the bonnet, and the first and second shielding members surround the outer peripheral side of the ventilation hole and are between the inner surface of the bonnet and the shroud. May be closed.

  The working machine of the present invention is applied to, for example, a rice transplanter. However, the working machine of the present invention is not limited to a rice transplanter.

  In the working machine according to the present invention, the shielding member that closes the gap between the shroud and the bonnet is attached to the peripheral wall of the shroud provided on the outer periphery of the radiator and is cut off above the water supply port of the radiator. A member and a second shielding member attached to the openable and closable bonnet and abutting on the disconnected portion of the first shielding member when the bonnet is in a closed state are provided. Thus, when the hood is in the closed state covering the engine, the working machine of the present invention closes the gap between the shroud and the bonnet by the first and second shielding members, and the warm air on the engine side is supplied to the radiator. It is possible to suppress the wraparound to the suction side. Further, when the bonnet is in the open state for opening the engine, the second shielding member is moved together with the bonnet and removed from the cut off portion of the first shielding member, that is, from above the water supply port of the radiator. Therefore, work on the water supply port of the radiator, such as replenishment of cooling water and attachment / detachment of the radiator cap, can be performed through the cutoff portion of the first shielding member, and maintainability of the radiator is improved.

  In the working machine of the present invention, the peripheral wall of the shroud has a concave portion cut out above the water supply port of the radiator, and the first shielding member is attached to the peripheral wall such that the cut off portion is located in the concave portion, When the hood is in the closed state, if the second shielding member is configured to contact the concave portion of the peripheral wall portion, the second shielding member is removed from above the water supply port of the radiator when the hood is in the open state, Since the space above the water supply port of the radiator is largely opened via the concave portion, the workability to the water supply port is improved, and the maintainability of the radiator is improved.

  Further, in the working machine of the present invention, a vent hole facing the shroud and the radiator is formed in one of the left and right sides of the hood with the traveling direction of the traveling body in the front-rear direction, and when the hood is in the closed state, the first shielding member is If the first and second shielding members are in contact with the inner surfaces of the left and right sides of the bonnet, and the first and second shielding members surround the outer peripheral side of the ventilation hole so that the gap between the inner surface of the bonnet and the shroud is closed, At the same time, it is possible to suppress the warm air from flowing to the air suction side (vent side) of the radiator, and at the same time, to shut off the flow of air between the inner surface of the bonnet and the shroud to the radiator for the cool air (outside air) passing through the vent. Can be improved.

  In addition, the configuration in which the ventilation holes facing the shroud and the radiator are formed on one side of the bonnet on the left and right sides, that is, the configuration in which the shroud and the radiator are arranged on one side of the engine in the left and right direction, is that the shroud and the radiator are mounted on the engine. On the other hand, the length of the traveling body in the front-rear direction can be reduced as compared with the configuration arranged in the front-rear direction. When such a configuration is applied to a rice transplanter that is connected to the rear of the traveling machine, the seedling planting device is arranged in the front-rear direction of the traveling machine when the rice transplanter during seedling operation stops on the shore. As the length is shorter, the seedling planting device can be positioned closer to the shore, so that the remaining planting width at the shore can be reduced, which is particularly effective.

It is a left view of the riding type rice transplanter in 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 a driving operation part which omitted a steering wheel. It is a drive system diagram 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 body front part. It is a right view which shows the inside of a hood. It is a right view which shows a bonnet. It is a top view which shows a front frame part. It is a right view which shows the opened state of a hood. It is a right view which shows the opened state of a hood. It is a perspective view which shows a shroud and a radiator. It is a right view which shows the radiator and the shroud periphery. It is a perspective view which shows the radiator and the shroud periphery. It is a top view which shows a hydraulic oil path with a shroud and an air cleaner. It is a top view which shows a shroud and an intake pipe by a partial cross section. It is an enlarged right side surface around the intake port.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings in a case where the present invention is applied to an eight-row type riding type rice transplanter 1 (hereinafter simply referred to as a rice transplanter 1) which is a working machine. In the following description, the left side in the traveling direction of the traveling 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 of the rice transplanter 1 will be described with reference to FIGS. 1 and 2. The rice transplanter 1 of the embodiment includes a traveling machine body 2 supported by a pair of left and right front wheels 3 as a traveling unit and a pair of left and right rear wheels 4. An engine 5 is mounted on a front part of the traveling body 2. By transmitting the power from the engine 5 to the rear transmission case 6 to drive the front wheels 3 and the rear wheels 4, the traveling body 2 is configured to travel 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 left and right outward from the front axle case 7 so as to be steerable. The cylindrical frame 8 projects from the rear of the transmission case 6, the rear axle case 9 is fixed to the rear end side of the cylindrical frame 8, and the rear wheel 4 is mounted on a rear axle 37 extending left and right outward from the rear axle case 9. ing.

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

  The driving operation unit 13 on the rear upper surface side of the bonnet 11 is provided with a control handle 14, a traveling main speed change lever 15, and a work lever 16 as an elevating operation tool (see FIG. 5). On the upper surface of the work step 10, a control seat 18 is disposed via a seat frame 17 behind the hood 11. In addition, on the left and right sides of the bonnet 11, left and right spare seedling mounting tables 24 are provided with the work step 10 interposed therebetween.

  The link frame 19 is erected at the rear end of the traveling body 2. A seedling planting device 23 for eight-row planting is connected to the link frame 19 via a lifting link mechanism 22 including a lower link 20 and a top link 21 so as to be able to move up and down. 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 the hitch bracket 38 to the rear side of the elevating link mechanism 22, the seedling planting device 23 is arranged movably up and down behind the traveling machine body 2. At the rear of the upper surface of the cylindrical frame 8, the cylinder base end side of a hydraulic lifting cylinder 39 is supported so as to be able to rotate up and down. The rod end of the lifting cylinder 39 is connected to the lower link 20. As a result of the vertical movement of the lifting link mechanism 22 due to the expansion and contraction of the lifting cylinder 39, the seedling planting apparatus 23 moves up and down. In addition, the seedling planting apparatus 23 is configured to be able to rotate around the rolling fulcrum axis and change the inclination posture in the left-right direction.

  The operator gets on the work step 10 from the getting on / off step 25 on the side of the work step 10, drives the seedling planting device 23 while moving in the field by the driving operation, and seedlings for planting seedlings in the field. Perform work (rice planting work). During the seedling planting operation, the operator replenishes the seedling placement device 23 with a seedling mat on the spare 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 transmission case 6, and four sets of eight articles for connection to the planting input case 26. (One set of two articles) planting transmission case 27, seedling planting mechanism 28 provided at the rear end side of each planting transmission case 27, seedling mounting table 29 for eight-row planting, and planting transmission case 27 And a float 32 for flattening the rice field, which is arranged on the lower surface side of the table. The seedling plant 28 is provided with a rotary case 31 having two planting claws 30 per line. Two rotary cases 31 are arranged in the planting transmission case 27. One rotation of the rotary case 31 causes the two planting claws 30 to cut out and grasp one seedling each, and plant the seedlings on the ground 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) a field scene is provided so as to be able to move 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 to the seedling planting device 23 is once transmitted to the inter-stock transmission case 75 provided on the upper right side of the rear axle case 9, and is transmitted from the inter-stock transmission case 75 to the planting input case 26. You. The seedling plant 28 and the seedling mounting table 29 are driven by the transmitted power. The inter-stock transmission case 75 incorporates an inter-stock transmission mechanism 76 for switching between seedlings to be planted, for example, to sparse planting, standard planting or dense planting, and a planting clutch 77 for disconnecting power transmission to the planting planting device 23. (See FIG. 6).

  It should be noted that side markers 33 are provided on the left and right outer sides of the seedling planting device 23. The side marker 33 includes a marker ring 34 for muscle pulling, and a marker arm 35 that rotatably supports the marker ring 34. 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 able to turn left and right. The side marker 33 has a working posture in which a trajectory serving as a reference in the next process is formed by landing on the rice field surface based on the operation of the operation lever 16 in the driving operation unit 13, and the marker ring 34 is raised to separate from the rice field surface. It is configured to be rotatable to the set non-working posture.

  As shown in FIGS. 3 and 4, the traveling body 2 includes a pair of right and left 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 of the front frame 51 and the front end of the rear frame 52 are welded and fixed to an intermediate connecting frame 53 that is horizontally long in the left-right direction. 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 pair of right and left 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 connecting frame 53 are formed 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 formed in a square frame shape in plan view.

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

  As can be seen from FIG. 4, the rearward portions of the left and right front frames 51 are connected to the front axle case 7 protruding on the left and right sides of the transmission case 6. Right and left ends of a U-shaped frame 61 extending obliquely downward and rearward in a side view are fixed by welding to the center side of the intermediate connecting frame 53. An intermediate portion of the U-shaped frame 61 is connected to an intermediate portion of the cylindrical frame 8 connecting the transmission case 6 and the rear axle case 9 (see FIGS. 3 and 4). At the middle part of the rear frame 55, the upper ends of the two left and right link frames 19 are fixed by welding. At the lower ends of the left and right link frames 19, an intermediate portion of a horizontally long rear axle support frame 63 is fixed 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 sound of the engine 5 is disposed below a step support 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 of the transmission case 6 arranged behind the engine 5. Although not described in detail, a handle shaft is rotatably disposed inside a handle post 67 erected on the upper surface of the power steering unit 66. The 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. Steering rods 68 (see FIG. 4) for steering the left and right front wheels 3 are respectively connected to the steering output shaft.

  The engine 5 of the embodiment is disposed on an intermediate portion between the front and rear base frames 56 with the output shaft 70 (crankshaft) directed in the left-right direction. The left and right width of the engine 5 is smaller than the inner dimension between the left and right front frames 51, and the lower side of the engine 5 is disposed on the intermediate portion of the front and rear base frames 56, and the left and right front frames 51. It is exposed below. In this case, the output shaft 70 (axis) of the engine 5 is located at 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 side of the engine 5 (left side in the embodiment). The proximal end of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the distal end 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 main traveling speed change lever 15 is located on one of the left and right sides (in the embodiment, on the left side) of the operation handle 14. Along the guide groove 83 formed in the driving operation unit 13. By operating the traveling main speed change lever 15, the traveling mode of the rice transplanter 1 is configured to be switched among forward, neutral, reverse, seedling transfer and movement modes. The work lever 16 is provided with a plurality of operations of raising and lowering the seedling planting device 23, disconnecting the planting clutch 77, and selecting the left and right side markers 33. And can be operated in the cross direction.

  In this case, when the working lever 16 is tilted forward once, the seedling planting device 23 is lowered, and when the working lever 16 is tilted forward once more, the planting clutch 77 is engaged and operated (the power is connected). Conversely, if the operation lever 16 is tilted once backward, the planting clutch 77 is disengaged (the power is cut off), and if it is tilted once again, the seedling planting device 23 is raised. In order to stop the raising and lowering operation of the seedling planting device 23, the operation lever 16 is tilted in the reverse direction. For example, when the downward movement of the seedling planting device 23 is stopped halfway, the work lever 16 may be tilted backward. When the operation lever 16 is tilted once to the left, the left side marker 33 assumes the working posture, and when the operation lever 16 is again tilted to the left, the left side marker 33 returns to the non-working posture. When the operation lever 16 is tilted to the right once, the right side marker 33 assumes the working posture, and when the operation lever 16 is again tilted to the right, the right side marker 33 returns to the non-working posture.

  Next, the drive system of the rice transplanter 1 will be described with reference to FIG. The output shaft 70 of the engine 5 projects outward from both left and right sides of the engine 5. An engine output pulley 72 is provided at a protruding end of the output shaft 70 protruding from the left side of the engine 5, a transmission input pulley 73 is provided on a transmission input shaft 71 protruding leftward from the transmission case 6, and 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 the pulleys 72 and 73 and the transmission belt 82.

  In the transmission case 6, the power transmitted through the hydraulic continuously variable transmission 40, which includes the hydraulic pump 40a and the hydraulic motor 40b, the planetary gear unit 41, the hydraulic continuously variable transmission 40, and the planetary gear unit 41, is shifted to a plurality of stages. A gear type auxiliary transmission mechanism 42, a main clutch 43 for interrupting power transmission from the planetary gear device 41 to the gear type auxiliary transmission mechanism 42, a traveling brake 44 for braking an output from the gear type auxiliary transmission mechanism 42, etc. ing. The hydraulic pump 40a is driven by power from the transmission input shaft 71, hydraulic fluid is supplied from the hydraulic pump 40a to the hydraulic motor 40b, and shifting power is output from the hydraulic motor 40b. The shifting power of the hydraulic motor 40b is transmitted to the gear type auxiliary transmission mechanism 42 via the planetary gear device 41 and the main clutch 43. Then, power is transmitted from the gear type auxiliary transmission mechanism 42 in two directions: the front and rear wheels 3, 4 and the seedling planting device 23.

  A part of the branching power toward the front and rear wheels 3 and 4 is transmitted from the gear type auxiliary transmission mechanism 42 to the front axle 36 of the front axle case 7 via the differential gear mechanism 45 to rotate the left and right front wheels 3. . The remainder of the branch power toward the front and rear wheels 3 and 4 is transmitted from the gear type auxiliary transmission mechanism 42 via 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 the gear type reduction mechanism 49. And transmitted to the rear axle 37 of the rear axle case 9 to rotate the right and left rear wheels 4. When the traveling brake 44 is operated, the output from the gear type auxiliary transmission 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 disengaged and the rear wheel 4 inside the turning is freely rotated, and the rotation of the rear wheel 4 outside the turning transmitted power is rotated. It turns by driving.

  In the rear axle case 9, there is provided a rotor drive unit 86 having a leveling clutch 84 for power disconnection to the leveling rotor 85. The power transmitted from the gear type auxiliary transmission 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 ground leveling rotor 85 via the universal joint shaft 87. The field scene is leveled by the rotation drive of the leveling rotor 85.

  The branch power toward the seedling planting device 23 is transmitted to the inter-stock transmission case 75 via a PTO transmission shaft mechanism 74 with a universal joint shaft. In the inter-stock transmission case 75, there are provided an inter-stock transmission mechanism 76 for switching between seedlings to be planted, for example, to sparse planting, standard planting or dense planting, and a planting clutch 77 for disconnecting power transmission to the planting planting device 23. Have. The power transmitted to the inter-stock transmission case 75 is transmitted to the planting input case 26 via the inter-stock transmission mechanism 76, the planting clutch 77, and the universal joint shaft 78.

  In the planting input case 26, a lateral feeding mechanism 79 for moving the seedling mounting table in a horizontal direction, a seedling vertical feeding mechanism 80 for vertically feeding and transporting the seedling mat on the seedling mounting table 29, and a planting input case 26. And a planting output shaft 81 that transmits power to the planting transmission case 27. By the power transmitted to the planting input case 26, the horizontal feed mechanism 79 and the seedling vertical feed mechanism 80 are driven to continuously move the seedling table 29 in a reciprocating manner. When it reaches the reciprocating turning point, the seedling mat on the seedling mounting table 29 is intermittently fed vertically. The 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 rotationally driven. When the fertilizer is provided, power is transmitted from the inter-stock transmission case 75 to the 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 40a and a hydraulic motor 40b, which 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 40a and the hydraulic motor 40b are connected to the respective suction side and discharge side via a closed loop oil passage 93. The 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 shift electric motor in accordance with the amount of depression of the traveling shift pedal 12, and the hydraulic motor 40b is driven to rotate forward or reverse. Hydraulic oil discharged from the charge drain joint 121 (see FIG. 16) 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. 16) 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 switching valve 94 and a steering hydraulic motor 95. By operating the steering handle 14, the steering hydraulic 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 operation force.

  The power steering unit 66 is connected to the flow divider 96. The flow divider 96 branches 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 lift switching valve 99 is a four-port, two-position mechanical switching type switchable between two positions, a supply position 99a for supplying hydraulic oil to the lift cylinder 39 and a discharge position 99b for discharging hydraulic oil from the lift cylinder 39. It is a valve. The raising and lowering switching valve 99 is switched by the operation of the work lever 16 to move the raising and lowering cylinder 39 so that the seedling planting device 23 moves up and down via the raising and lowering link mechanism 22. The flow divider 96 and the lifting / lowering switching valve 99 are housed in a valve unit 89 provided at the rear of the transmission case 6.

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

  An accumulator 105 is connected between the electromagnetic on-off valve 101 and the elevating cylinder 39 in the cylinder oil passage 100 via an accumulator oil passage 104. In the case of a sudden change in the operating oil pressure in the elevating cylinder 39, the accumulator 105 absorbs the operating oil pressure fluctuation, and the elevating cylinder 39 is smoothly expanded and contracted by the combination of the elevating switching valve 99 and the solenoid on-off valve 101, so that the seedlings are planted. The device 23 is moved up and down lightly.

  The second oil passage 98 of the flow divider 96 is connected to a rolling control unit 106 that controls the left-right inclined posture of the planting apparatus 23. The rolling control unit 106 has a built-in electromagnetic control valve 107 for supplying hydraulic oil to the rolling cylinder 108. By the switching operation of the electromagnetic control valve 107, the rolling cylinder 108 provided integrally with the rolling control unit 106 is operated. As a result, 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 control valve, a check valve, an oil filter, and the like.

  Next, the structure inside the hood 11 will be described with reference to FIGS. The bonnet 11 includes a front bonnet 11a surrounding the front and side of the engine 5, a rear hood 11b surrounding the rear of the engine 5, and an operation panel 11c covering the top of the engine 5. A ventilation hole 200 having an upper ventilation hole 201 and a lower ventilation hole 202 is opened on each of the left and right side surfaces of the bonnet 11a. In the air hole 200, the upper air hole 201 and the lower air hole 202 are arranged vertically. On the inner wall of the hood 11a, mesh members 203 that cover the upper ventilation hole 201 and the lower ventilation hole 202 from the inside of the hood 11a are attached to the left and right portions of the hood 11a, respectively. The mesh member 203 has a large number of holes, and allows air to flow between the inside and the outside of the bonnet 11a.

  On the right side (one side) of the engine 5 disposed in the hood 11, a cooling fan 152 that rotates by the power of the engine 5 is disposed. The cooling fan 152 is disposed to face the air hole 200 on the right side of the hood 11a. A radiator 153 for water cooling of the engine 5, which is an example of a heat exchanger, is disposed on the right side of the cooling fan 152 and between the cooling fan 152 and the vent hole 200. A shroud 154 that surrounds the outer periphery of the cooling fan 152 and the outer periphery of the radiator 153 is disposed between the radiator 153 and the engine 5. The cooling fan 152 is located at the opening of the shroud 154, and the cooling fan 152 faces the radiator 153. In the radiator 153, a core portion 153a in which a plurality of heat radiation fins are arranged so that air flows therethrough has a part thereof, in this embodiment, an upper front portion and an upper central portion opposed to the vent hole 200. Most of the core portion 153 a facing the air hole 200 faces the lower air hole 202.

  In the bonnet 11, a frame-shaped front frame portion 155 arranged in front of and above the engine 5 is connected to the front frame 54 and the handle post 67, respectively. The front frame portion 155 includes a plate-shaped front frame 171 erected on the front frame 54, and a right front frame 172 and a left front frame 173 extending rearward from the engine 5 from both ends of the upper end portion of the plate-shaped front frame 171. Have. The plate-shaped front frame 171 has a flat portion that stands vertically in the longitudinal direction of the front frame 54. The plate-shaped front frame 171 is fixed to the front frame 54 by fastening a lower projection protruding forward from a lower end portion of the flat portion to a front frame bracket 174 fixed to the front surface of the front frame 54. The plate-shaped front frame 171 has an upper protruding portion projecting rearward from an upper end portion of the flat portion. The front ends of the right front frame 172 and the left front frame 173 are fixed to the rear surface of the flat portion of the plate-shaped front frame 171 and the lower surface of the upper protruding portion.

  The right front frame 172 and the left front frame 173 are formed of a bent metal tube. The front end of the right front frame 172 is arranged in the left-right direction, and is guided to the right from the joint with the plate-shaped front frame 171 and then curved rearward, and is slanted rearward while being curved to the desired shape in the left-right direction. It extends in the front-rear direction upward, and is curved above the engine 5 and linearly extends in the front-rear direction and substantially in the horizontal direction. The left front frame 173 has a symmetrical shape with the right front frame 172, and is guided to the left from the joint with the plate-shaped front frame 171 and then curved rearward to extend in the front-rear direction.

  A post bracket 175 projecting forward is fixed to the handle post 67. The center of a horizontally long horizontal frame 176 is fixed to the front end of the post bracket 175. A right rear bracket 177 is fixed to a right end portion of the horizontal frame 176. The rear end of the right front frame 172 is bolted to the right rear bracket 177. A lever guide bracket set 178 is fixed to the left end of the horizontal frame 176. The lever guide bracket set 178 has a groove corresponding to the guide groove 83 (see FIG. 5) for restricting and guiding the movement of the traveling main transmission lever 15. The rear end of the left front frame 173 is bolted to the lever guide bracket set 178.

  The central portion of the right front frame 172 and the central portion of the left front frame 173 are connected by an operation panel central stay member 179. The operation panel central stay member 179 includes a right and left horizontally long portion extending from the right front frame 172 to the left front frame 173, and a right fixing portion and a left fixing portion protruding downward from both ends of the left and right horizontally long portion. I have. The operation panel center stay member 179 is fixed to the right front frame 172 via a bracket fixed to the right front frame 172 at the lower end of the right fixed portion, and is connected to a bracket fixed to the left front frame 173 at the lower end of the left fixed portion. And is fixed to the left front frame 173. The operation panel center stay member 179 is connected to a forward portion of a horizontal portion on the rear end side of the frames 172 and 173.

  The central portion of the right front frame 172 and the central portion of the left front frame 173 are connected to each other by a horizontally long bar-shaped horizontal frame 180 fixed to the frames 172, 173 at a position forward of the fixed position of the operation panel central stay member 179. I have. The bar-shaped horizontal frame 180 is connected to a portion closer to the rear among the front low and high portions on the front end side of the frames 172 and 173. A base end portion of the operation panel front stay member 181 disposed in the front-rear direction is fixed to a central portion of the rod-shaped horizontal frame 180 on the right side. The operation panel front stay member 181 extends forward from the rod-shaped horizontal frame 180. An operation panel front bracket 182 is bolted to a distal end portion of the operation panel front stay member 181.

  An operation panel right rear bracket 183 is bolted to a right rear bracket 177 fixed to a right end portion of the horizontal frame 176. An operation panel left rear bracket 184 is bolted to the lever guide bracket set 178 fixed to the left end portion of the horizontal frame 176. The operation panel 11c is connected and fixed to the traveling body 2 by screwing both ends of the left and right horizontally long portions of the operation panel central stay member 179 and brackets 182, 183, and 184 for fixing the operation panel.

  The front bonnet 11a has a substantially U shape in plan view so as to surround the front side, left side, and right side of the engine 5. The right upper portion and the left upper portion of the front bonnet 11a are connected to the traveling machine body 2 via the rotation fulcrum shafts 191 respectively. One end of a right-hand rotating stay member set 192 is screwed at a rear upper position on the right side of the front bonnet 11a, and one end of a left-rotating stay member set 193 is screwed at a rear upper position on the left side of the front bonnet 11a. I am. The rotating stay member sets 192 and 193 are configured by connecting three stay members by bolting. The other end of the right-hand rotating stay member set 192 is turned via a bolt constituting a turning fulcrum shaft 191 to a rear end portion of a right rear stay member 194 projecting rearward from a right end portion of the horizontal frame 176. It is movably mounted. The other end of the right-hand rotating stay member set 192 is rotatably attached to a left rear portion of the lever guide bracket set 178 via a bolt constituting a turning fulcrum shaft 191. As a result, the front bonnet 11a has its lower end abutted on the work step 10 and the closed position (closed state) covering the engine 5 with the rotation fulcrum shaft 191 as the rotation fulcrum, and the front portion is moved upward. It is rotatably connected to the traveling machine body 2 between an open position (open state) for opening the engine 5.

  A ferromagnetic member 195 made of, for example, steel is attached to the inner surface of the front lower portion of the front bonnet 11a. A bonnet fixing portion 196 containing a permanent magnet is disposed on the front upper surface of the work step 10 at a position corresponding to the ferromagnetic member 195 when the front hood 11a is closed (closed position). When the front portion of the front bonnet 11a is at the closed position, the ferromagnetic member 195 is attracted to the bonnet fixing portion 196 by magnetic force and is fixed to the work step 10.

  The rear hood 11b is disposed between the rear of the operation panel 11c and the work step 10 so as to surround the rear, right, and left sides of the handle post 67. The upper end of the rear bonnet 11b is disposed along the locking ridge protruding from the rear lower surface of the operation panel 11c, and the rear bonnet 11b is formed in a ridge protruding from the upper surface of the work step 10. The lower end of the rear bonnet 11b is arranged in the locking groove, and is fixed between the rear of the operation panel 11c and the work step 10.

  To the right front frame 172 of the front frame portion 155, a front shroud bracket 156 for bolting an upper front portion of the shroud 154 is fixed. An upper rear portion of the shroud 154 is bolted to a lower end portion of the right rear bracket 177 fixed to a right end portion of the horizontal frame 176. The radiator 153 is supported at both lower end portions thereof by a pair of radiator brackets 158 fixed to a front portion of the right front frame 51, and is bolted to the shroud 154. Thus, the radiator 153 and the shroud 154 are supported by the right front frame 51 and the front frame 155 in the hood 11.

  As shown in FIG. 8 to FIG. 11, a mudguard member 159 for preventing the adhesion of mud scattered from the front wheel 3 or a so-called short circuit is bolted to the front radiator bracket 158 of the pair of radiator brackets 158. Have been. The mudguard member 159 includes an inclined surface portion 159a inclined right and left, a vertical surface portion 159b protruding downward from the left end of the inclined surface portion 159a along the front-rear direction, and an inclined surface along the left and right direction. There is a front side surface portion 159c protruding upward from the front end of the portion 159a. The inclined surface portion 159a has its upper surface in contact with the lower surface of the radiator bracket 158, and is bolted to the radiator bracket 158. The front side surface portion 159c has a protruding surface portion protruding leftward on the left side of the peripheral edge thereof. This protruding surface portion is inserted into a slit portion provided at a lower portion of the front side surface of the shroud 154. This slit portion is provided on the front side surface of the shroud 154, facing the front frame 54 below the bonnet 11 and having an opening portion opened toward the right side to insert the protruding surface portion. I have.

  The vertical surface portion 159b of the mudguard member 159 has front and lower peripheral edges arranged along an end surface of a peripheral wall portion 141 of the shroud 154 described later, and covers a lower front portion of the shroud 154. In addition, the inclined surface portion 159a and the front side surface portion 159c of the mudguard member 159 block the gap between the right front frame 51 and the shroud 154. As a result, in the vicinity of the lower front portion of the shroud 154, the air discharged to the engine 5 side via the shroud 154 by the operation of the cooling fan 152 flows around the front side surface or the lower side surface of the shroud 154, and the lower front portion of the shroud 154. A so-called short circuit, which is sucked from the part into the shroud 154 and circulated, is suppressed. Then, a decrease in the cooling efficiency of the radiator 153 and the engine 5 due to the warm air heated by the heat of the engine 5 being sucked from the lower front portion of the shroud 154 is suppressed. Further, the mudguard member 159 prevents the mud scattered from the front wheels 3 from adhering to the radiator 153. The arrangement and shape of the mudguard member 159 (cooling air circulation suppressing member) that is disposed below the hood 11 and between the front frame 54 and the shroud 154 and that suppresses a short circuit below the hood 11 are described in the above embodiment. It is not limited to. The arrangement and shape of the cooling air circulation suppressing member may be any configuration as long as it can suppress the warm air heated by the heat of the engine from flowing around the outer periphery of the shroud below the hood and being sucked into the radiator.

  As shown in FIGS. 8 to 14 and the like, the shroud 154 includes a peripheral wall portion 141 that is formed to protrude toward the radiator 153 at the peripheral edge of the shroud 154. The peripheral wall 141 surrounds the outer periphery of the radiator 153. A water supply port 142 projects from the center of the upper surface of the radiator 153. The peripheral wall 141 is formed with a concave portion 141 a in which the upper part of the water supply port 142 is cut out. Cooling water is supplied into the radiator 153 via the water supply port 142. A radiator cap 143 is attached to the water supply port 142 of the radiator 153.

  On the side surface of the water supply port 142 of the radiator 153, a joint portion connected to a reservoir tank 144 for storing cooling water via a reservoir hose member 145 is formed. The reservoir tank 144 is bolted to a reservoir tank bracket 185 fixed to an upper protruding portion of the plate-shaped front frame 171 of the front frame portion 155. The reservoir hose member 145 is guided from the water supply port 142 of the radiator 153 to the engine 5 through a through hole provided in the shroud 154. Further, the reservoir hose member 145 is guided under the right front frame 172 and the bar-shaped horizontal frame 180 from the rear of the bar-shaped horizontal frame 180 to above the bar-shaped horizontal frame 180, and connects the bar-shaped horizontal frame 180 to the operation panel front stay member 181. It is led to the reservoir tank 144 over the upper part.

  In the bonnet 11, a first shielding member 146 made of an elastic material such as rubber is attached to a distal end of the peripheral wall 141 of the shroud 154. The first shielding member 146 has, for example, a groove having a concave groove into which the distal end of the peripheral wall 141 is fitted, and a columnar portion connected to the groove on the side opposite to the concave groove. The first shielding member 146 is arranged along the peripheral wall 141 and is cut off at the concave portion 141a of the peripheral wall 141. That is, the first shielding member 146 is not disposed on the concave portion 141a. When the front hood 11a is closed and in the closed position, the first shielding member 146 contacts the inner surface of the right side of the front hood 11a on the outer peripheral side of the vent hole 200, and the gap between the shroud 154 and the front hood 11a. Close up.

  A second shielding member 147 made of an elastic material such as rubber is disposed on the inner surface of the right side of the front hood 11a. The second shielding member 147 has, for example, a configuration similar to that of the first shielding member 146, and includes a groove having a concave groove and a columnar portion connected to the groove. The second shielding member 147 is attached to a tip end of a convex second shielding member attaching portion 148 protruding toward the shroud 154 side on the inner surface on the right side of the front bonnet 11a. The second shielding member 147 is arranged so as to be curved so that the central portion thereof becomes convex toward the engine 5 in plan view, and the concave portion of the peripheral wall portion 141 of the shroud 154 is in a state where the front bonnet 11a is closed and in the closed position. It is in contact with the part 141a. Further, the second shielding member 147 is arranged so as to be continuous with the disconnected portion of the first shielding member 146 when the front hood 11a is in the closed state.

  In the rice transplanter 1 of this embodiment, the outer periphery of the radiator 153 is surrounded by the peripheral wall 141 of the shroud 154. Further, the gap between the shroud 154 and the front bonnet 11a is closed by the first shielding member 146 and the second shielding member 147. Thus, when the front hood 11a is in the closed state, a space between the vent hole 200 and the radiator 153 and a space on the engine 5 side are defined. Further, the flow of air in the gap between the shroud 154 and the front hood 11a is shut off. Therefore, the rice transplanter 1 of this embodiment can suppress the warm air in the bonnet 11, which has been heated by the heat of the engine 5, from flowing to the air suction side (the air hole 200 side) of the radiator 153. Further, the ventilation hole 200 is disposed on the right side of the front hood 11a so as to face the radiator 153, and the first shielding member 146 and the second shielding member 147 surround the outer peripheral side of the ventilation hole 200. The air flow between the shroud 154 and the front hood 11a is blocked by the member 146 and the second shielding member 147, so that the rate of suction of the cool air that has passed through the ventilation holes 200 into the radiator 153 can be improved. Further, since the gap between the shroud 154 and the front hood 11a is closed by the first shielding member 146 and the second shielding member 147, water entering the bonnet 11 during rainy weather or car washing enters the radiator 153 side. Is prevented.

  As shown in FIGS. 12 to 14, when the front hood 11a is opened and in the open position, the second shielding member 147 attached to the front hood 11a is moved upward and removed from the concave portion 141a of the shroud 154. Is done. In addition to the concave portion 141a formed by cutting out the upper part of the water supply port 142 of the radiator 153 on the peripheral wall portion 141 of the shroud 154, the second shielding member 147 is formed from the concave portion 141a when the front hood 11a is opened. By being removed, the water supply port 142 of the radiator 153 and the space above the radiator cap 143 are largely opened. Thus, the work of attaching and detaching the radiator cap 143 and the work of supplying cooling water from the water supply port are improved, and the maintainability of the radiator 153 is improved.

  Further, in the rice transplanter 1 of this embodiment, the cooling fan 152, the radiator 153, and the shroud 154 are arranged on the right side (one side in the left-right direction) of the engine 5 with the traveling direction of the traveling body 2 in the front-rear direction. Therefore, the length of the traveling body 2 in the front-rear direction can be reduced as compared with the configuration in which the cooling fan, the shroud, and the radiator are arranged in the front-rear direction with respect to the engine. With such a configuration, when the rice transplanter 1 during the seedling planting operation stops on the shore, the shorter the length of the traveling body 2 in the front-rear direction, the more the seedling planting device 23 (see FIGS. 1 and 2). Because it can be located on the shore side, the remaining planting width at the shore can be reduced.

  Next, the configuration around the intake system of the engine 5 and the hydraulic oil cooler will be described with reference to FIGS. An air cleaner 160 is arranged above the engine 5 in the hood 11. The air cleaner 160 is mounted on an upper portion of the engine 5, for example, on an air cleaner bracket 161 bolted to the upper surface of a cylinder head cover, and a fixing belt 162 having both ends detachably attached to the air cleaner bracket 161 is provided on the outer periphery of the air cleaner 160. It is wound and fixed in position. One end of an intake pipe 163 for taking in air and one end of a supply pipe 164 that supplies air to the engine 5 after purifying air from the intake pipe 163 in the air cleaner 160 are connected to the air cleaner 160. The other end of the supply pipe 164 is connected to a fresh air intake of the engine 5, for example, an intake manifold.

  The other end of the intake pipe 163 is connected to an intake port forming part 165 integrally formed with the shroud 154. The intake port forming portion 165 is formed so as to protrude from the surface on the engine 5 side of the shroud 154 toward the surface on the radiator 153 side above the radiator 153 storage position, and has 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 area above the radiator 153. The intake port forming portion 165 has an intake port 166 on the outer peripheral side surface. The intake port 166 is formed so as to open downward, in this embodiment, obliquely forward and downward, approximately half of the contour when viewed from the cylinder center axis direction of the intake port formation portion 165. The substantially circular bulging end face of the intake port forming portion 165 is closed. The air inlet forming portion 165 and the air inlet 166 are arranged so as to face the air hole 200, in this embodiment, the upper air hole 201. When the end of the intake pipe 163 is inserted into the intake port forming portion 165 from the engine 5 side, the intake port 166 and the air cleaner 160 are flow-connected via the intake pipe 163.

  The intake port forming portion 165 is provided with an outer peripheral side portion connecting the base 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 has been improved. Further, the outer peripheral side surface of the intake port forming portion 165 is connected to a peripheral wall portion 141 protruding and formed on the radiator 153 side at the peripheral edge of the shroud 154, and 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 places on the bulging end face of the intake port forming portion 165 by two fixing screws 168, and communicates between the intake port 166 and the air hole 200, in this embodiment, with the intake port 166. It is arranged between the pores 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 forming portion 165, and covers the intake port 166 when viewed from the right. Two rib portions extending from the base end portion to the bulging end surface are formed on the outer peripheral side surface of the intake port forming portion 165 so as to protrude in the outer peripheral direction corresponding to the mounting position of the fixing screw 168. These ribs secure the mounting position of the fixing screw 168 and improve the strength of the intake port forming portion 165.

  As shown in FIGS. 15 to 18, the core portion 124 of the hydraulic oil cooler 122 is disposed between the radiator 153 and the ventilation hole 200 on the right side of the bonnet 11a. The core portion 124 is formed of, for example, a meandering pipe meandering in the vertical direction, and is arranged to face the central portion from the forward portion of the radiator 153. In the hydraulic oil cooler 122, two mounting stay members 125, 125 extending in the front-rear direction and 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 end portions of the mounting stay members 125, 125 to both end portions of the radiator 153. As shown in FIG. 15, the core portion 124 and the intake port 166 are arranged at positions shifted in the horizontal direction when viewed from the side of the vent hole 200 on the right side surface of the hood 11.

  As shown in FIGS. 15 to 17, 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. The hydraulic oil outlet side of the core portion 124 is connected to a hydraulic oil return joint 123 of the transmission case 6 via a hydraulic oil return pipe 128 and a hydraulic oil return tube 129. By the operation of the charge pump 91 (see FIG. 7), the hydraulic oil inside the transmission case 6 is supplied to 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. Is 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 intake port 166 of the engine 5 is disposed so as to face the ventilation hole 200 provided on the right side surface of the bonnet 11, and the passage between the intake port 166 and the ventilation hole 200. A shielding member 167 that covers the air inlet 166 when viewed from the pore 200 side is provided. Accordingly, even when water is applied to the bonnet 11 from the right side, for example, at the time of car washing, the infiltration of water into the intake port 166 is prevented by the shielding member 167. Water can be prevented from entering the intake path of the engine 5 from the intake port 166.

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

  Further, in the riding type rice transplanter 1 of this embodiment, the intake port 166 is opened obliquely forward and downward. Therefore, even in a situation where water is sprayed from the right side of the bonnet 11 toward the ventilation hole 200, in addition to the effect of preventing the water from entering the intake port 166 by the shielding member 167, it is possible to more reliably prevent the water from entering the intake port 166. Water can be prevented from entering.

  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 ventilation hole 200 on the right side of the bonnet 11 and the radiator 153, and the intake port 166 is located above the radiator 153. Are located. Further, when viewed from the side of the ventilation hole 200 on the right side of the bonnet 11, the core portion 124 and the intake port 166 are arranged at positions shifted from each other in the horizontal direction. Therefore, it is possible to prevent heat generated in the hydraulic oil cooler 122, particularly the core portion 124, from being directly sucked into the intake port 166. Thus, the temperature rise of the combustion air taken in from the intake port 166 due to the heat generated by the hydraulic oil cooler 122 can be suppressed, and the decrease in the output of the engine 5 can be suppressed.

  Further, the ventilation hole 200 on the right side surface of the bonnet 11 is vertically divided into an upper ventilation hole 201 and a lower ventilation hole 202, the intake port 166 faces the upper ventilation hole 201, and the core portion 124 has a lower ventilation hole 202. Is facing. In the radiator 153, a core portion 153 a through which air flows is formed such that an upper front portion and an upper central portion of the core portion 153 a face the ventilation hole 200, and most of the core portion 153 a faces the lower ventilation hole 202. Further, the air flowing into the inside of the bonnet 11 from the ventilation hole 200 on the right side of the bonnet 11 by the operation of the cooling fan 152 flows to the engine 5 side via the core portion 153 a of the radiator 153 and the shroud 154. Accordingly, air can flow from the upper ventilation hole 201 on the right side of the bonnet 11 toward the diagonally lower left core portion 153 a, and since the intake port 166 is disposed above the radiator 153, the hydraulic oil cooler 122 The emitted heat can be prevented from being directly sucked into the intake port 166.

  By the way, conventionally, in the configuration in which the intake port for taking in the combustion air of the engine is arranged in the hood, the intake port is often arranged near the ventilation port provided on the side surface of the bonnet. However, in a situation where water is sprayed from the side onto the bonnet, for example, during a car wash, the vents allow water as well as air to pass therethrough. There was a problem of infiltration into the.

  Therefore, in a working machine equipped with an engine mounted on a traveling body, a cooling fan arranged on one side of the engine, and a hood covering the engine and having a vent on a side surface facing the cooling fan, If the intake port of the engine is arranged to face the ventilation port, and if a shielding member that covers the intake port as viewed from the ventilation port side is provided between the intake port and the ventilation port, The above problem can be solved. In other words, even in a situation where water is sprayed on the bonnet from the side, intrusion of water into the intake port is prevented by the shielding member, and water can be prevented from entering the engine intake path from the intake port.

  Further, the intake port may be integrally formed with a fan shroud surrounding the cooling fan, and the shielding member may be attached to the fan shroud. This eliminates the need to separately provide a member for supporting the shielding member, so that the number of parts and manufacturing cost can be reduced, and the shielding member can be easily attached.

  Further, the intake port may be opened downward. Thereby, it is possible to more reliably prevent water from entering the air inlet from the side.

  Further, a radiator is disposed between the cooling fan and the ventilation port, wherein a core portion of a hydraulic oil cooler is disposed between the ventilation port and the radiator, and the intake port is provided for the radiator. The core portion and the intake port may be disposed at an upper position, and may be disposed at positions displaced in the horizontal direction from the vent port side. This makes it possible to prevent heat generated in the hydraulic oil cooler from being directly sucked into the intake port. Further, with respect to the combustion air taken in from the intake port, it is possible to suppress a rise in temperature due to the heat generated by the hydraulic oil cooler, and thus to suppress a decrease in engine output.

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

1 Riding rice transplanter (working machine)
2 Running body 5 Engine 11 Bonnet 11a Front bonnet 146 First shielding member 147 Second shielding member 141 Peripheral wall 141a Concave portion 142 Water supply port 153 Radiator 154 Shroud

Claims (1)

A traveling fuselage equipped with an engine, a hood that can be opened and closed to cover the engine, a radiator arranged on one side of the engine in the hood, a shroud provided on the outer periphery of the radiator, and a gap between the shroud and the bonnet A work machine provided with a shielding member for closing the
A first shielding member attached to a peripheral wall of the shroud and cut off above a water supply port of the radiator; and a first shielding member attached to the hood and the first hood when the hood is closed. A work machine including a second shielding member that abuts on a disconnected part of the shielding member.

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