JP2014001665A - Paddy field work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce or muffle intake air pulsation sound emitted from an air cleaner to provide favorable work environment.SOLUTION: A paddy field work machine includes an engine mounted on a traveling section connecting a working section behind it, and an air cleaner which is disposed in an upper portion of the engine, intakes and purifies outdoor air, and supplies the air to the engine. A silencer is provided in an intake port of the air cleaner, and has a labyrinth-like outdoor air guide flow passage opening to communicate with outdoor air.

Description

  The present invention relates to a paddy field machine, and more particularly to a structure of an air cleaner provided in a rice transplanter.

  Conventionally, there exists what was disclosed by patent document 1 as one form of a rice transplanter. That is, Patent Document 1 is configured such that an engine is mounted on the rear part of a traveling unit having a planting unit connected to the rear, and the traveling driving force and the planting driving force are extracted from the engine. A rice transplanter that can perform work is disclosed. A fuel tank is disposed immediately above the engine, and an exhaust muffler and an air cleaner are disposed adjacent to each other right and left immediately after the fuel tank and immediately above the cylinder portion of the engine. Further, a driver's seat is disposed immediately above the fuel tank, the exhaust muffler, and the air cleaner so that an operator seated in the driver's seat can operate the driver's seat. Further, rear wheels of the traveling unit are arranged in the vicinity of the left and right sides of the fuel tank, the exhaust muffler, and the air cleaner.

JP 2007-308118 A

  However, in the rice transplanter of Patent Document 1 described above, intake air pulsation sounds are released when outside air is sucked from the intake port of an air cleaner disposed immediately below the driver's seat on which the operator is seated, and those sounds are emitted. However, it was a noise or an annoying noise for the operator who was sitting and operating in the driver's seat, which deteriorated the working environment. Further, since the right rear wheel of the traveling unit is disposed in the vicinity of the right side of the air cleaner, there is a possibility that muddy water splashed from the right rear wheel may enter from the air cleaner inlet. Further, there is a possibility that muddy water may enter from the air cleaner inlet even when the car is washed. That is, there is a possibility that the purification function in the air cleaner may be damaged by the infiltrated muddy water.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a paddy field work machine that can improve the work environment by reducing or silencing the intake pulsation sound released from the air cleaner.

  The paddy field work machine according to the first aspect of the present invention is a paddy field in which an engine is mounted on a traveling unit having a working unit connected rearward, and an air cleaner is disposed at the upper part of the engine to supply the engine with outside air that has been purified by sucking outside air. The working machine is characterized in that a silencer is provided at an air inlet of the air cleaner, and the silencer has a labyrinth-like outside air guide channel portion that opens and communicates with outside air.

  In such a paddy field machine, a silencer having a labyrinth-like outside air guide passage portion that opens and communicates with the outside air is provided at the air cleaner inlet, so that the intake sound of the outside air to the air cleaner flows into the labyrinth-like outside air guide flow. It is attenuated and muffled when flowing through the road. Therefore, the intake sound does not become a noise or an annoying sound for a worker who is sitting on the driver's seat and operating, or a surrounding assistant or a resident. As a result, the work environment and the surrounding environment can be secured satisfactorily. Also, since the labyrinth-shaped outside air guide channel is open to communicate with the outside air, mud and mud splashed up from the wheels and mud and mud splashed during car washing enter from the air cleaner inlet. There is no fear, and the purification function in the air cleaner can be maintained normally.

  The paddy field working machine according to the invention described in claim 2 is the paddy field working machine according to the invention described in claim 1, wherein the engine is mounted within the distance between the front wheel and the rear wheel of the traveling unit. And

  In such paddy field machines, the engine is mounted sandwiched between the front wheel and rear wheel shaft distances, so the air cleaner located at the top of the engine is placed close to the wheel that carries the mud and mud of the paddy field. In this case, since the muffler having the labyrinth-like outside air guide passage portion communicating with the outside air is provided at the air inlet of the air cleaner, there is no possibility that mud and muddy water enter from the air cleaner inlet. Therefore, the purification function in the air cleaner can be maintained normally.

  A paddy field working machine according to a third aspect of the present invention is the paddy field working machine according to the first or second aspect, wherein the silencer is a cylindrical proximal end side air intake guide extending from the air inlet of the air cleaner. And a cap-shaped tip-side intake guide piece having a larger-diameter opening arranged in a superposed state at the tip opening portion of the base-end side intake guide piece, and an opening peripheral edge portion of the tip-side intake guide piece And an outer air suction passage formed between the outer peripheral surface portion of the base end side air intake guide piece, an upstream side external air guide passage formed along the inner peripheral surface of the front end side air intake guide piece, and a base end side air intake guide A labyrinth-like outside air guide channel portion is formed by the downstream side outside air guide channel formed in the piece.

  In such a paddy field machine, outside air is sucked from an outside air intake path formed between the opening peripheral portion of the front end side air intake guide piece and the outer peripheral surface portion of the base end side air intake guide piece, and the inner peripheral surface of the front end side air intake guide piece The outside air can be U-turned through the upstream side outside air guide channel formed along the outer side, and the outside air can flow into the air cleaner from the intake port through the downstream side outside air guide channel formed in the proximal end side air inlet guide piece. . Thus, sound can be steadily silenced by allowing the outside air to flow in the labyrinth-like outside air guide channel.

  A paddy field working machine according to a fourth aspect of the present invention is the paddy field working machine according to any one of the first to third aspects, wherein the muffler opens the air cleaner inlet toward the front. The base end side air intake guide piece extends from the air inlet toward the front, and the front end side air intake guide piece is arranged in front of the base end side air intake guide piece.

  In such paddy field machines, the outside air guide channel part of the muffler is formed in a labyrinth shape, so even if muddy water scatters from all directions, front, back, top, bottom, left and right during car washing, the muddy water reaches the air cleaner inlet. It is possible to reliably prevent the intrusion. And since the silencer is formed by arranging the air inlet of the air cleaner, the base end side air intake guide piece and the front end side air intake guide piece in the front-rear direction, it can be arranged compactly along the engine. In other words, it is possible to secure a certain distance between the silencer and the wheel near the outside, and avoid the problem that mud or the like is accumulated between the silencer and the wheel near the outside. it can.

  According to the present invention, it is possible to reduce or mute the intake pulsation sound and combustion explosion sound emitted from the air cleaner by the muffler, so that the working environment can be improved. Since the muffler can prevent the muddy water from entering from the air inlet of the air cleaner, the purification function in the air cleaner can be maintained normally.

The left view of the rice transplanter which concerns on this invention. The right view of a traveling part. The left view of a support frame, an engine, an exhaust muffler, and a rear axle case. The top view of a support frame, an engine, an air cleaner, an exhaust muffler, and a rear axle case. The rear view of a support frame, an engine, an air cleaner, an exhaust muffler, and a rear axle case. The right side view of an engine, an air cleaner, and an exhaust muffler. Sectional side explanatory drawing of an air cleaner. FIG. 7 is a sectional view taken along line II in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. A shown in FIG. 1 is a rice transplanter as a paddy field working machine according to the present invention. As shown in FIG. 1, the rice transplanter A has a planting part 3 as a working part attached to a rear part of a traveling part 1 as a towing vehicle via a lifting mechanism part 2 so as to be movable up and down. And this rice transplanter A is making it possible to perform the planting operation | work of a some seedling.

  As shown in FIGS. 1 and 2, the traveling unit 1 is configured by mounting an upper body 12 on a lower body 11. The lower body 11 is formed with a connecting frame 15 extending in the front-rear direction between a mission case 13 disposed at the front and a rear axle case 14 disposed at the rear. Front axle cases 17 and 17 are respectively extended outwardly on the left and right side wall portions of the transmission case 13, and a pair of left and right front wheels 19 are connected to the outer lower ends of the front axle cases 17 and 17 via front axles 18 and 18. 19 are attached. A pair of left and right rear wheels 21, 21 are attached to the left and right outer ends of the rear axle case 14 via rear axles 20, 20. The connection frame 15 is formed in a pipe shape having a quadrangular cross section and extending straight in the front-rear direction. An engine 22 as a prime mover is mounted on the connection frame 15.

  The engine 22 and the transmission case 13 are interlocked and connected via a belt transmission mechanism 30 as a first transmission mechanism on the left side. The transmission case 13 and the rear axle case 14 are connected to each other on the left side via a transmission shaft 31 as a second transmission mechanism. A clutch case 33 disposed on the right rear portion of the lower body 11 is interlocked and connected to the transmission case 13 via a transmission shaft 32 as a third transmission mechanism on the right side portion. A power intake portion (not shown) of the planting portion 3 is interlockingly connected to the clutch case 33 via a power transmission shaft 35 as a fourth transmission mechanism.

  As shown in FIGS. 1 and 2, a cover body 41 is stretched on the lower body 11 via a support frame body 40 having a frame shape in plan view, which will be described later. The cover body 41 is formed in a stepped shape with the front half disposed at a low position and the rear half disposed at a high position. A handle column 42 is erected on the front portion of the cover body 41, and a handle 43 is attached to the upper end portion of the handle column 42. A driver's seat 44 is arranged behind the handle 43 and at a high position in the rear half of the cover body 41 to form a driver 45.

  As shown in FIGS. 3 to 6, the engine 22 includes a cylinder portion 51 at the rear portion of the engine body 50. An air cleaner 60 is connected in communication with the upper right portion of the cylinder portion 51, while an exhaust muffler 90 is connected in communication with the upper left portion of the cylinder portion 51. The air cleaner 60 sucks outside air through the cylinder portion 51 and purifies the outside air through a filter-type purifying body 80 provided inside. The purified outside air is sucked (intake) into the cylinder portion 51 of the engine 22. Further, the exhaust muffler 90 silences exhaust exhausted from the cylinder portion 51 and exhausts it to the outside. Here, as shown in FIG. 2, the engine 22 is mounted within a distance W between the front axle 18 of the front wheel 19 of the traveling unit 1 and the rear axle 20 of the rear wheel 21.

  As shown in FIG. 1, the planting unit 3 is provided with a connection frame 210 in the planting mission case 200 and connects the rear end portion of the lifting mechanism unit 2 to the connection frame 210. A plurality of transmission cases 220 are arranged in the left-right direction in the planting mission case 200, a seedling stage 240 is placed on the transmission case 220 via a support frame 230, and a float 250 is arranged below each transmission case 220. doing. 260 is a leveling device.

  As shown in FIG. 1, the elevating mechanism unit 2 is pivotally connected to rising support pieces 130 and 130 of a support frame 40, which will be described later, and a connection frame 210 of the planting unit 3, and is interposed therebetween. doing. The elevating mechanism 2 includes a top link 300 and a lower link 310 extending in the front-rear direction, and an elevating cylinder 320 interposed between a middle portion of the lower link 310 and a rear support piece 110 of a support frame body 40 described later. It is composed.

  In the configuration as described above, as a feature of the present embodiment, as shown in FIG. 7, a silencer 62 is provided at the air inlet 61 of the air cleaner 60, and the silencer 62 is opened and communicates with the outside air. An outside air guide channel 63 is provided.

  The muffler 62 includes a cylindrical proximal-side intake guide piece 64 extending from the intake port 61 of the air cleaner 60, and a larger-diameter opening 66 at the distal end opening 65 of the proximal-side intake guide piece 64. And a cap-shaped tip side intake guide piece 67 arranged in a superposed state. An outside air intake path 69 formed between the opening peripheral edge portion 68 of the distal end side intake guide piece 67 and the outer peripheral surface portion of the proximal end side intake guide piece 64 and the inner peripheral surface of the distal end side intake guide piece 67 are formed. A labyrinth-like outside air guide channel portion 63 is formed by the upstream side outside air guide channel 70 and the downstream side outside air guide channel 71 formed in the base end side intake guide piece 64.

  The muffler 62 is formed by opening the air inlet 61 of the air cleaner 60 forward and extending the base end side air intake guide piece 64 forward from the air inlet 61. A front end side air intake guide piece 67 is arranged in the front.

  Since the silencer 62 having the labyrinth-like outside air guide channel 63 that opens and communicates with the outside air is provided in the air inlet 61 of the air cleaner 60, the intake sound of the outside air to the air cleaner 60 is generated. When flowing through the labyrinth-shaped outside air guide flow path 63, it is attenuated and silenced. For this reason, the intake sound does not become a noise or an annoying sound for an operator who is seated in the driver's seat 44 and is operating, a surrounding assistant or a resident. As a result, the work environment and the surrounding environment can be secured satisfactorily. Further, since the labyrinth-shaped outside air guide channel 63 is opened to communicate with the outside air, mud and mud splashed up from the rear wheel 21 on the right side and mud and mud scattered at the time of car washing are air cleaner 60. Therefore, the purification function within the air cleaner 60 can be maintained normally.

  Since the engine 22 is mounted by being sandwiched between the front wheel 19 and the rear wheel 21 which are wheels, the air cleaner 60 disposed at the upper part of the engine 22 is disposed in the vicinity of the rear wheel 21 carrying mud and mud of paddy fields. Even in this case, since the muffler 62 having the labyrinth-like outside air guide passage portion 63 communicating with the outside air is provided at the air inlet 61 of the air cleaner 60, there is a possibility that mud and muddy water may enter from the air inlet 61 of the air cleaner 60. Absent. Therefore, the purification function in the air cleaner 60 can be maintained normally. Here, the rear wheel 21 is attached in the axial direction of the rear axle 20 so that the attachment position can be adjusted, and the rear wheel 21 may be attached in the vicinity of the air cleaner 60 in some cases.

  Outside air is sucked from an outside air intake passage 69 formed between the opening peripheral edge portion of the distal end side intake guide piece 67 and the outer peripheral surface portion of the proximal end side intake guide piece 64, and along the inner peripheral surface of the distal end side intake guide piece 67. The outside air is U-turned through the upstream side outside air guide channel 70 formed in this way, and the outside air is caused to flow into the air cleaner 60 from the intake port 61 through the downstream side outside air guide channel 71 formed in the base side side air intake guide piece 64. be able to. Thus, sound can be steadily silenced by flowing the outside air in the labyrinth-like outside air guide channel portion 63.

  Since the outside air guide channel 63 of the silencer 62 is formed in a labyrinth shape, the muddy water enters the air inlet 60 of the air cleaner 60 even if muddy water scatters from all directions of front, rear, top, bottom, left and right during car washing. Can be steadily prevented. Since the silencer 62 is formed by arranging the intake port 61 of the air cleaner 60, the proximal end side intake guide piece 64, and the front end side intake guide piece 67 in the front-rear direction, the silencer 62 is arranged compactly along the engine 22. Can be set. That is, a certain distance can be secured between the muffler 62 and the right rear wheel 21 near the outside, and mud or the like is present between the muffler 62 and the right rear wheel 21 near the outside. The problem of being deposited can be avoided.

  Next, the configuration of the support frame 40, the air cleaner 60, and the exhaust muffler 90 will be specifically described with reference to FIGS.

  As shown in FIGS. 3 to 5, the support frame body 40 includes a front support piece 100 and a rear support piece 110 that extend in the left-right direction and are arranged substantially in parallel with an interval in the front-rear direction. A pair of left and right side support pieces 120, 120 extending in the front-rear direction is provided between 110 and is formed in a frame shape in plan view. The two side support pieces 120 and 120 are inclined rearward and upward to form rear upper extension pieces 121 and 121, and the rear support pieces 110 are arranged between the rear ends of the rear upper extension pieces 121 and 121. A pair of left and right rising support pieces 130, 130 are installed between the rear support piece 110 and the rear axle case 14 so as to extend forward and upward. Here, the pair of left and right rising support pieces 130 and 130 are disposed inwardly of the rear upper extension pieces 121 and 121 with a certain interval in the left and right direction in the rear view. In addition, projecting support pieces 140, 140, 150, and 150 are projected outward from the front and middle portions of both side support pieces 120 and 120, respectively. Auxiliary side support pieces 160, 160 extending in the front-rear direction are provided between the outer ends of the projecting support pieces 150, 150 in the middle and the outer ends of the rear support piece 110. Between the front portions of the side support pieces 120, 120, first and second horizontal support pieces 170, 180 extending in the left-right direction are horizontally mounted with a space therebetween. A handle column support 34 is installed between the front support piece 100 and the first horizontal support piece 170. The second horizontal support piece 180 is connected to the mission case 13. As described above, the support frame 40 is mounted in a bridge between the transmission case 13 and the rear axle case 14.

  As shown in FIG. 2, the air cleaner 60 is disposed in the right space S <b> 1 formed in a convex shape in a right side view from the right rear upper extension piece 121, the rear support piece 110, and the right rising support piece 130. ing. And the air cleaner 60 is arrange | positioned in the inner lower side of the right rear upper extension piece 121, as shown in FIG. A mudguard plate 82 having a trapezoidal shape in side view is disposed on the right outer side, which is directly below the rear upper extension piece 121. A front upper portion that is substantially a quarter of the right rear wheel 21 is disposed on the right outer side of the mudguard plate 82. In this way, the scattered mud lifted by the right rear wheel 21 is prevented from scattering and adhering to the air cleaner 60 via the mudguard plate 82.

  As shown in FIGS. 4 and 6 to 8, the air cleaner 60 has an inner wall connected in communication with a purified outside air communication pipe 83 projecting from the cylinder portion 51 of the engine 22 to the right rear and outward. The air cleaner 60 is formed in a box shape having a substantially circular shape when viewed from the side, the upper surface rear portion 72 is a horizontal surface, and the rear end surface upper portion 73 is a vertical surface. A circular air inlet 61 is opened in the rear end surface upper portion 73. The intake port 61 is connected to the rear end of a cylindrical proximal intake guide piece 64 extending in the front-rear direction. A cap-shaped distal-side intake guide piece 67 having an inner diameter D2 that is substantially three times larger than its outer shape D1 is disposed in the distal-end opening 65 of the proximal-end-side intake guide piece 64 via a communication support piece 81. . The front end side air intake guide piece 67 is formed in a cap shape having an opening 66 at the rear end portion from a cylindrical peripheral wall portion 74 and a disk-like front end wall 75 stretched on the front end face of the peripheral wall portion 74. Yes. The distal-side intake guide piece 67 has a front-rear width (cylinder length) that is approximately two-thirds of the front-rear width (cylinder length) of the proximal-side intake guide piece 64 and the outer diameter D1 of the proximal-side intake guide piece 64. The distal end opening portion 65 of the proximal end side intake guide piece 64 is disposed at a substantially central portion of the front and rear width of the peripheral wall portion 74 through the opening portion 66, so that the peripheral wall portion 74 has an inner diameter D 2. The rear half portion and the distal end portion of the proximal end side intake guide piece 64 are arranged in an overlapping state on the inner and outer sides. A rear end edge portion of the peripheral wall portion 74 is an opening peripheral edge portion 68.

  As shown in FIGS. 7 and 8, the communication support piece 81 is continuously provided on the inner ring piece 77 that is continuous with the outer peripheral surface of the proximal end side intake guide piece 64 and the inner peripheral surface of the distal end side intake guide piece 67. And a plurality of connecting pieces 79 interposed between the ring pieces 77 and 78 at intervals in the circumferential direction. The connecting piece 79 is formed in a narrow plate shape extending in the radial direction of the front end side air intake guide piece 67, and the ring pieces 77, 78 and the connecting pieces 79, 79 adjacent in the circumferential direction are inside the opening 66. The outside air can be circulated through the intake port formed in a partition shape. Here, the extension of the connecting piece 79 is formed such that the upper side is formed with a short width and the lower side is formed with a long width, and the axis of the distal end side intake guide piece 67 is set as the axis of the proximal end side intake guide piece 64. It is biased downward from the center. That is, the ground clearance at the upper end of the distal-end-side intake guide piece 67 is arranged at substantially the same level as the upper ends of the air cleaner 60 and the engine 22 while the opening area of the opening 66 of the distal-end-side intake guide piece 67 is secured. We are trying to make it compact in the height direction.

  With such a configuration, an outside air intake path 69 is formed between the opening peripheral edge portion 68 of the peripheral wall portion 74 of the distal end side intake guide piece 67 and the outer peripheral surface portion of the distal end portion of the proximal end side intake guide piece 64. . An upstream outside air guide channel 70 is formed along the inner peripheral surface of the peripheral wall 74 of the tip side intake guide piece 67. Between the terminal portion of the inner peripheral surface of the peripheral wall portion 74 of the front end side air intake guide piece 67, the front end wall 75 of the front end side air intake guide piece 67, and the front end opening portion 65 of the base end side air intake guide piece 64 is bent outside air guide. A flow path 76 is formed. A downstream outside air guide channel 71 formed in the proximal end side intake guide piece 64 is communicated with the bent outside air guide channel 76. An air inlet 61 of an air cleaner 60 is communicated with the downstream side outside air guide channel 71. Then, the labyrinth-like (maze-like) shape in which the outside air is sucked into the outside air intake passage 69 → the upstream side outside air guide passage 70 → the bent outside air guide passage 76 → the downstream side outside air guide passage 71 → the intake port 61 → the air cleaner 60. An outside air guide channel portion 63 is formed.

  The air cleaner 60 has a communication port 84 formed at a substantially central portion of the inner wall. A front end portion of the purified outside air communication pipe 83 projecting rearward and outward from the cylinder portion 51 is connected to the communication port 84 in an orthogonal state, and the intake port 61 is opened to be directed forward and outward by a certain angle θ. ing. Then, a proximal end side intake guide piece 64 is connected to the intake port 61 on the same axis, and the proximal end side intake guide piece 64 is extended forward and outward. By doing so, a constant interval is maintained between the distal end portion of the proximal end side intake guide piece 64 and the right side wall of the engine body 50, and the peripheral wall portion 74 of the distal end side intake guide piece 67 and the right side wall of the engine body 50. To avoid interference.

  As shown in FIG. 1, the exhaust muffler 90 is disposed in a left space S <b> 2 that is formed in a convex shape in a left side view from the left rear upper extension piece 121, the rear support piece 110, and the left rising support piece 130. doing. As shown in FIGS. 4 and 5, the exhaust muffler 90 is disposed below the left rear upper extension piece 121 and on the left side (outer side) of the left rising support piece 130. Here, the rear end portion of the inner wall of the exhaust muffler 90 is disposed adjacent to the left side (outer side) of the left rising support piece 130. Mudguards and air-cooling plates 93 are attached to the outer surface at regular intervals in the left-right width direction. A front upper portion which is substantially a quarter of the left rear wheel 21 is disposed outside the left side of the mudguard and air cooling plate 93. With this configuration, the scattered mud and the like lifted by the left rear wheel 21 is prevented from scattering and adhering to the exhaust muffler 90 via the mudguard / air cooling plate 93.

  The exhaust muffler 90 is formed in a box shape having a substantially rectangular shape when viewed from the side, and the front portion of the inner wall is connected to an exhaust communication pipe 94 protruding leftward from the cylinder portion 51 of the engine 22. An exhaust pipe 92 protrudes rearward from the lower portion of the rear end wall 91. The exhaust muffler 90 is disposed in the left space S2 in the left side view shown in FIG. 1, and the left-right width between the left rear upper extension piece 121 and the left rising support piece 130 in the rear view shown in FIG. Arranged in between. That is, since the exhaust muffler 90 is disposed in the left space S2, a desired space is formed outside the left rising support piece 130 and inside the left rear wheel 21. Large capacity can be formed. As a result, a mute function can be ensured. Conventionally, the exhaust muffler has been disposed inside the rear upper extension piece 121 on the left side at the front. For this reason, even if the exhaust muffler is formed wider outward to increase the capacity, the capacity cannot be increased due to the hindrance of the left rear upper extension piece 121.

  The mudguard and air cooling plate 93 is formed in a rectangular plate shape that is substantially the same shape as the outer surface of the exhaust muffler 90, and the upper edge 95 is bent inward. The mudguard and air cooling plate 93 is attached so as to cover the exhaust muffler 90 with a certain distance in the vertical width direction and the horizontal width direction between the upper surface and the outer surface of the exhaust muffler 90. With this configuration, an outside air flow channel 96 is formed between the inside surface of the mudguard and air cooling plate 93 and the outside surface of the exhaust muffler 90, guided by the inside surface of the upper end edge portion 95 and flowing outside. I am doing so. Therefore, when the traveling unit 1 travels, outside air flows through the outside air flow channel 96 and the exhaust muffler 90 is air-cooled (air-cooled).

A Rice transplanter 1 Traveling part 2 Lifting mechanism part 3 Planting part 60 Air cleaner 61 Air inlet 62 Silencer

Claims (4)

A paddy field work machine in which an engine is mounted on a traveling unit connected to the rear of the working unit, and an air cleaner is disposed at the top of the engine to purify the outside air taken in and supply the engine.
While providing a silencer at the air cleaner inlet,
The silencer has a labyrinth-shaped outside air guide passage portion that opens and communicates with outside air.   The paddy field work machine according to claim 1, wherein the engine is mounted within a distance between a front wheel and a rear wheel of the traveling unit. The muffler has a cylindrical base end side air intake guide piece extending from the air cleaner inlet, and a cap shape in which a larger diameter opening portion is arranged in a superposed state at the front end opening portion of the base end side air intake guide piece. A front end side air intake guide piece,
An outside air intake path formed between the opening peripheral edge portion of the distal end side intake guide piece and the outer peripheral surface portion of the proximal end side intake guide piece, and an upstream side outside air guide formed along the inner peripheral surface of the distal end side intake guide piece The paddy field work according to claim 1 or 2, wherein a labyrinth-like outside air guide channel portion is formed by the channel and a downstream side outside air guide channel formed in the proximal end side intake guide piece. Machine.   The silencer is formed by opening the intake port of the air cleaner toward the front, extending the proximal end side intake guide piece from the intake port toward the front side, and leading the front side intake guide piece in front of the proximal end side intake guide piece. The paddy field work machine according to any one of claims 1 to 3, wherein a piece is arranged.

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