JP4546939B2 - Ride type rice transplanter - Google Patents

Description

  The present invention relates to a structure of a riding type rice transplanter.

  In the riding type rice transplanter, for example, as disclosed in Patent Document 1, a post (11 in FIGS. 1 and 3 of Patent Document 1) is fixed to the rear part of the machine body, and a top link and a lower link (Patent Document). 1 and 3 in FIG. 1 and FIG. 3 are supported by a support so as to be swingable up and down and extend rearward, and a seedling planting device is supported at the rear portion of the top link and lower trunk.

Japanese Patent Laid-Open No. 7-165129 (FIGS. 1 and 3)

According to the structure of Patent Document 1, in order to support the top link and the lower link so that the top link and the lower link can swing up and down, a support column dedicated to supporting the top link and the lower link is fixed to the rear part of the machine body, thereby simplifying the structure. There is room for improvement.
An object of the present invention is to simplify a support structure for a top link and a lower link in a riding type rice transplanter.

(Constitution)
The first feature of the present invention resides in the following configuration in a riding type rice transplanter.
A transmission case and a rear wheel support case for supporting the right and left rear wheels are arranged at the rear of the fuselage. The rear wheel support case includes a center portion and right and left axle support portions positioned at the right and left ends, and the right and left axle support portions are disposed outside the right and left axle support portions. Includes separate cover cases and support brackets on the right and left axle support portions. The top link is integrated with the rear part of the upper part of the mission case and is extended to the rear by the upper support bracket of the mission case that extends rearward. The lower link extends to the right and left axles. The support bracket of the support part is supported so as to be swingable up and down and extends rearward, and the seedling planting device is supported on the rear part of the top link and the lower link. The top link and the lower link are driven to swing up and down, the rear end is connected to the front end of the hydraulic cylinder connected to the lower link, and the top link is connected to the upper support bracket of the transmission case from both outer sides of the hydraulic cylinder Connect to the upper support bracket of the mission case together with the top link.

(Function)
According to the first feature of the present invention, the top link and the lower link are supported by the support brackets of the right and left axle support portions of the transmission case and the rear wheel support case , which may be called an existing structure, so as to be swingable up and down. This eliminates the need for a support dedicated to support the top link and the lower link as in the structure of Patent Document 1 (even if a support dedicated to support the top link and the lower link is provided, a small support may be used).

(The invention's effect)
According to the first feature of the present invention, in the riding rice transplanter, the top link and the lower link are vertically moved to the support brackets of the right and left axle support portions of the transmission case and the rear wheel support case, which may be called existing structures. Support for swinging eliminates the need for supporting pillars for supporting the top link and lower link (even if a supporting pillar for supporting the top link and lower link is provided) The support structure of the top link and the lower link can be simplified.

  As shown in FIGS. 1 and 2, a link mechanism 3 is provided at the rear part of the aircraft supported by the right and left front wheels 1 and the right and left rear wheels 2, and the link mechanism 3 has a three-row planting type seedling. The planting apparatus 4 is supported and the riding type rice transplanter is comprised.

  As shown in FIGS. 3, 4, and 5, the transmission case 5 and the rear wheel support case 6 are integrally formed and arranged at the rear part of the fuselage, and the transmission case 5 is inclined with respect to the rear wheel support case 6. It is located in the upper front. The rear wheel support case 6 includes a central portion 6a and right and left axle support portions 6b located at right and left ends, and a cover case 7 for the right and left axle support portions 6b It is configured separately. A pair of bearings 8 are provided inside the right and left axle support portions 6b and the cover case 7, and the right and left axles 9 are supported by the bearings 8, and a large-diameter reduction gear is mounted on the right and left axles 9. 9a is fixed. The right and left axles 9 are extended to the right and left, and the right and left rear wheels 2 are supported on the right and left axles 9.

  With the above structure, the lateral width of the rear wheel support case 6 is relatively narrow as shown in FIGS. 3, 4 and 5, and as shown in FIG. 6, between the right and left axle support portions 6b, Seedlings A (planting) planted by the seedling planting device 4 located rearward between the right axle support portion 6b and the right rear wheel 2 and between the left axle support portion 6b and the left rear wheel 2 Addendum) is located.

  As shown in FIG. 3 and FIG. 7, in the mission case 5, a support bracket 5 a is integrally formed at the rear part of the upper portion of the mission case 5 and extends rearward, and a pair of left and right tops in the shape of an elongated flat plate. The link 3a is supported by the support bracket 5a so as to be swingable up and down and extends rearward. In the rear wheel support case 6, a support bracket 6c is integrally formed with the right and left axle support portions 6b, and the support shaft 10 is rotatably supported across the right and left support brackets 6c. Square pipe-shaped right and left lower links 3b are fixed to the support shaft 10 and extend rearward. As shown in FIGS. 1 and 2, the seedling planting device 4 is supported at the rear of the top link 3a and the lower link 3b, and as shown in FIGS. 1, 3, and 7, the support bracket 5a and the lower link 3b are connected to each other. A hydraulic cylinder 11 is connected over the entire area.

  With the above structure, as shown in FIGS. 1 and 3, when the hydraulic cylinder 11 is contracted, the top link 3a and the lower link 3b swing upward and the seedling planting device 4 is raised. When the cylinder 11 is extended, the top link 3a and the lower link 3b swing downward and the seedling planting device 4 is lowered.

  As shown in FIGS. 1, 3 and 4, a front wheel support case 12 that supports the right and left front wheels 1 to be steerable left and right is provided. The front wheel support case 12 and the rear wheel support case 6 (transmission case 5 ), The support frame 13 is erected and connected. The support frame 13 is formed in a round pipe shape and is positioned at the center of the left and right sides of the machine body. A transmission shaft 14 is disposed inside the support frame 13.

  As shown in FIGS. 3, 4, 8 (b) and (b), a horizontal frame 15 having a U-shaped cross section and fixed to the middle portion of the support frame 13 is fixed to the middle of the support frame 13. As shown in (b), a horizontal frame 16 having an L-shaped cross section is connected to the horizontal frame 15, and a right vertical frame 17 (left vertical frame 17) configured by bending a round pipe into an arch shape, The lateral frame 16 is connected to the right lateral side (left lateral side) of the lateral frame 16 and the right lateral side (left lateral side) of the rear wheel support case 6 (cover case 7). As shown in FIGS. 2, 3, 8 (b) and (b), right and left step frames 74 are fixed to the rear portion of the horizontal frame 15 in the support frame 13 and extend right and left laterally outside. The auxiliary step 75 is fixed to the right and left step frames 74, and the frame 77 is connected across the right and left vertical frames 17 and the right and left step frames 74.

  As shown in FIGS. 3 and 9 (a) and 9 (b), a horizontal frame 18 is connected to the rear portions of the right and left vertical frames 17, and a support bracket 17a and a receiving bracket 17a are attached to the right and left vertical frames 17. The member 17b is fixed, and a spring 19 is attached to the receiving member 17b. A driver's seat 20 (see FIGS. 1 and 2) is swingably supported around the horizontal axis P1 of the right and left support brackets 17a, and a fuel tank 21 is attached across the right and left receiving members 17b. A fuel tank 21 is located below the driver seat 20. The state shown in FIG. 3 is a usage state of the driver seat 20, and the driver seat 20 is supported by the right and left support brackets 17 a and the right and left springs 19. When the driver's seat 20 is lifted upward around the horizontal axis P1 and tilted forward, the upper side of the fuel tank 21 is opened, and fuel can be easily supplied to the fuel tank 21.

  As shown in FIGS. 3 and 4, the engine 22 and the transmission case 5 are disposed below the driver's seat 20 between the right and left vertical frames 17, and the crankcase 22 a of the engine 22 attaches the anti-vibration rubber 23. Via the horizontal frame 15. The engine 22 is tilted rearward so that the crankcase 22a of the engine 22 is located on the front side and the cylinder 22b of the engine 22 is located on the rear side. The mission case 5 is disposed to be inclined forward so that the mission case 5 is located below the rear of the engine 22, the upper part of the mission case 5 is located on the front side, and the lower part of the mission case 5 is located on the rear side. . The left and right support plates 24, 25 are fixed to the upper part of the cylinder 22b of the engine 22 and the upper part of the transmission case 5, and a pair of left and right vibration-proof rubbers 26 are attached between the support plates 24, 25. The cylinder 22b of the engine 22 is supported on the upper part of the transmission case 5 via a vibration isolating rubber 26.

  As shown in FIGS. 3 and 4, an anti-vibration rubber 23 is arranged on the right side in a plan view with respect to the support frame 13 and the crank case 22 a of the engine 22, and the left side of the crank case 22 a of the engine 22. The output shaft 22c protrudes from the side. An input shaft 5b protrudes from the left lateral side of the transmission case 5, and a transmission belt 29 extends over a pulley 27 fixed to the output shaft 22c of the engine 22 and a pulley 28 fixed to the transmission case 5 input shaft 5b. It is wound. A support arm 30 is swingably supported around the horizontal axis P2 of the crankcase 22a of the engine 22, and a tension pulley 30a is supported on the support arm 30 so that the tension pulley 30a is pressed against the transmission belt 29. In addition, a spring 31 for urging the support arm 30 counterclockwise in FIG. 3 is provided.

  With the above structure, as shown in FIGS. 3 and 4, the power of the engine 22 is transmitted to the transmission case 5 via the transmission belt 29 and is subjected to a speed change operation to be transmitted to the right and left rear wheels 2, thereby transmitting the transmission shaft. 14 is transmitted to the front wheel support support case 12 through 14, and is transmitted to the right and left front wheels 1, and is transmitted from the mission case 5 to the seedling planting device 4 through the PTO shaft 66 (see FIG. 1). .

  As shown in FIGS. 10 and 11, boss portions 12a are integrally formed at the right and left ends of the front wheel support case 12, and the periphery of the vertical axis P3 is directed obliquely outward of the right and left boss portions 12a. Further, the transmission shaft 32 is rotatably supported by a bearing 34, and the bevel gear 32a of the transmission shaft 32 is engaged with the bevel gear 36a of the transmission shaft 36 to which the power of the transmission shaft 14 (see FIGS. 3 and 4) is transmitted. is doing. The right and left front wheel support portions 33 are rotatably supported by the transmission shaft 32 by bearings 35, whereby the right and left front wheel support portions 33 rotate about the vertical axis P3 obliquely outward and downward. It is supported freely. An axle 37 is rotatably supported by bearings 76 on the right and left front wheel support portions 33, and a bevel gear 37a of the axle 37 is engaged with a bevel gear 32b of a transmission shaft 32.

  As shown in FIGS. 10 and 11, the right and left front wheels 1 are configured to include three spoke portions 1 a and a boss portion 1 b, and the spoke portion 1 a is bent to the lateral outer side so that the boss portion 1 b is formed. Concave portion 1c is configured to be positioned laterally outside. Since the right and left boss portions 12a and the transmission shaft 32 are directed obliquely outward and downward, the right and left front wheel support portions 33 enter the recesses 1c of the right and left front wheels 1 obliquely from above. The axle 37 is connected to the boss 1b of the right and left front wheels 1. In this case, as shown in FIG. 10, the positive camber B3 is set on the right and left front wheels 1 so that the center line B2 of the right and left front wheels 1 is located laterally outside the vertical line B1. In this state, the recesses 1c of the right and left front wheels 1 are slightly opened upward.

  As shown in FIG. 6, between the right and left axle support portions 6b, between the right axle support portion 6b and the right rear wheel 2, and between the left axle support portion 6b and the left rear wheel 2. When the seedling A (planting strip) planted by the seedling planting device 4 located at the rear is positioned, as shown in FIG. 10, the left and right center (support frame 13 is connected to the front wheel support case 12). A seedling A (planting strip) to be planted by the seedling planting device 4 located at the rear is positioned substantially directly under the portion) and on the lateral inner side of the right and left front wheel support portions 33.

  As shown in FIGS. 12, 13, and 14, a support frame 38 is connected diagonally forward and upward to a front center of the left and right sides of the airframe in the front wheel support case 12, and a support shaft 39 is disposed around the longitudinal axis P <b> 4 of the support frame 38. A fan-shaped gear-like steering member 40 is rotatably supported and connected to the lower portion of the support shaft 39. As shown in FIGS. 4, 12, and 13, the steering member 40 and the right and left front wheel support portions are connected. A tie rod 41 is connected to the main body 33. As shown in FIGS. 4 and 5, right and left side clutches CL capable of transmitting and shutting off the power to the right and left rear wheels 2 are provided inside the rear wheel support case 6, and the steering member. An operating rod 42 is connected across 40 and the right and left side clutches CL.

  As shown in FIGS. 12, 13, and 14, a cylindrical handle post 43 is fixed to a support frame 38 and extends upward, and a steering shaft 44 is rotatably supported inside the handle post 43. . A steering handle 45 is fixed to the steering shaft 44 at the upper end of the handle post 43, and a pinion gear 44 a fixed to the lower end of the steering shaft 44 is engaged with the gear portion of the steering member 40. In this case, lower portions of the steering member 40 and the pinion gear 44a of the steering shaft 44 are opened, and a cover (not shown) that covers the steering member 40 and the pinion gear 44a of the steering shaft 44 is not provided.

  With the above structure, as shown in FIG. 4, when the steering handle 45 is rotated left and right, the steering member 40 is swung left and right via the pinion gear 44 a of the steering shaft 44, and the right and left front wheels 1. Is steered left and right. In a state in which the right and left front wheels 1 are steered left and right within the range of the right or left set angle from the straight traveling position, the right and left side clutches CL are operated to the transmission side. Next, when the right and left front wheels 1 are steered to the right (left) beyond the right (left) set angle, the right (left) side clutch CL, which is the turning center side, is manipulated to the disengagement side. . As a result, power is transmitted to the right and left front wheels 1 and the left (right) rear wheel 2 on the outside of the turn, and the right (left) rear wheel 2 on the turn center side rotates freely, so that a small turn A turn to the right (left) at the radius is performed.

  As shown in FIGS. 1 and 2, the operation arm 46 is configured by bending the round pipe into a vertically long arch shape. As shown in FIGS. 12 and 13, the right and left lower portions of the operation arm 46 are supported by a support frame. 38 is supported so as to be swingable around the horizontal axis P5 on the right and left lateral sides of 38. As a result, the operating arm 46 is configured to be switchable between a stowed standing posture as shown in FIG. 12, a two-dot chain line in FIG. 12, and a use posture protruding forward from the front of the aircraft as shown in FIG. Yes. A holding mechanism (not shown) that frictionally holds the operation arm 46 is provided, and the operation arm 46 can be held in a retracted posture and a use posture, or in any intermediate posture between the retracted posture and the use posture. is there.

  As shown in FIGS. 12, 13, and 14, a frame 47 is erected and connected to the right and left lower portions of the operation arm 46, and a flat plate-like restricting portion 48 having a predetermined lateral width is fixed to the frame 47. ing. A center mascot 49 is provided on the upper portion of the operation arm 46, and the center mascot 49 is configured to be switchable between a standing posture as shown in FIG. 12 and a downward non-use posture as shown in FIG. . As shown in FIGS. 13 and 15, the steering member 40 is provided with a rectangular opening, and the right and left lateral sides of the opening are the right and left (a pair of) contact portions 40 a.

  With the above structure, when the operation arm 46 is set in the retracted position as shown in FIGS. 12 and 13, the restricting portion 48 is separated downward from the steering member 40, and the steering handle 45 is rotated left and right. Thus, the right and left front wheels 1 can be steered left and right.

  Next, when the operating arm 46 is set to the use posture in a state where the right and left front wheels 1 are set to the straight traveling positions, the restricting portion 48 is brought into contact with the right and left as shown in the two-dot chain line in FIG. 12 and FIG. It enters between the parts 40a. In this case, the interval between the right and left contact portions 40a is set larger than the width of the restriction portion 48, and the restriction portion 48 enters between the right and left contact portions 40a as described above. In the state, a small gap is formed between the restricting portion 48 and the right contact portion 40a, and between the restricting portion 48 and the left contact portion 40a.

Accordingly, as shown in the two-dot chain line of FIG. 12 and FIG. 15, in the state where the operation arm 46 is set to the use posture, the operator who has descended from the airframe to the ground has the operation arm 46, for example, over a steep step. It is possible to stably enter and exit the work area.
The steering wheel 45 can be used to steer the right and left front wheels 1 left and right within a predetermined angle (small angle) from the straight-ahead position to the right and left when the operation arm 46 is set to the use posture. However, it is impossible to steer the front wheel 1 to the right and left beyond the predetermined angle (small angle) on the right and left from the straight position (right or left as shown in FIG. 15). The contact part 40a of the contact part contacts the restriction part 48). As a result, the orientation of the aircraft can be corrected without difficulty while the right and left front wheels 1 are not steered unnecessarily large to the left and right.

  In this case, as shown in FIGS. 1, 2, and 12, when the pedal arm 61 is operated downward by holding the handle 61b of the pedal arm 61 described later (equivalent to the stepping operation of the pedal portion 61a), as described later. The power from the engine 22 to the transmission case 5 is cut off, the right and left front wheels 1 are braked, and the right and left rear wheels 2 are braked. As described above, when the pedal arm 61 is operated downward, the pedal arm 61 can be held downward by engaging a holding lever 71 described later with the pedal portion 61a.

  As shown in FIGS. 12 and 13, the support bracket 50 is fixed to the handle post 43, and the operation arm 51 is swingably supported around the horizontal axis P <b> 6 on the left lateral side of the support bracket 50, A transmission lever 52 is fixed to the operation arm 51, and an operation rod 53 (see FIG. 4) is connected between the mission case 5 and the operation arm 51. As a result, the speed change lever 52 is swung around the horizontal axis P6, so that the speed change gear (not shown) in the transmission case 5 is moved in the reverse position, the neutral position, the planting travel position, and the planting. It is possible to operate at a low-speed moving position that is slower than the traveling position and a high-speed moving position that is faster than the planting traveling position.

  As shown in FIGS. 12 and 14, an accelerator lever 54 is swingably supported around a horizontal axis P7 on the right side of the support bracket 50, and an accelerator portion (not shown) of the engine 22 and an accelerator lever are supported. The support bracket 50 is provided with a friction holding mechanism (not shown) capable of holding the accelerator lever 54 at an arbitrary position.

  As shown in FIGS. 12 and 14, a pulley 56 is rotatably supported on the right side portion of the support bracket 50, and a support member 57 configured by bending a wire rod in a loop shape is fixed to the handle post 43. A rope 58 connected to a starter portion (not shown) of the engine 22 is wound around a pulley 56 and passed through a support member 57, and a grip portion 59 is attached to an end portion of the rope 58. Accordingly, the engine 22 can be started by pulling the grip portion 59 and pulling the rope 58.

  As shown in FIGS. 13 and 14, a support bracket 60 is fixed to a portion of the support frame 13 slightly rearward of the front wheel support case 12, and the pedal arm 61 can swing around the horizontal axis P <b> 8 of the support bracket 60. The pedal portion 61 a is fixed to the front portion of the pedal arm 61 as shown in FIGS. 4 and 12. As shown in FIGS. 3, 4, 13, and 14, the operation arm 62 is fixed to the pedal arm 61, and the operation rod 63 is connected across the support arm 30 and the operation arm 62. As shown in FIGS. 4, 13, and 14, a multi-plate friction brake B is provided in the center of the left and right sides of the airframe in the front wheel support case 12, and extends across the operation arm 64 and the operation arm 62 of the brake B. The operating rod 65 is connected.

  3 and 4, when the pedal portion 61a is stepped on, the operation rod 63 is pulled, and the support arm 30 is swung downward against the spring 31, and the tension pulley 30a does not press the transmission belt 29, the power from the engine 22 to the transmission case 5 is cut off, and the right and left front wheels 1, the right and left rear wheels 2, and the seedling planting device 4 are stopped. At the same time, the operating rod 65 is pulled, the brake B is operated to the braking side, and the right and left front wheels 1 are braked. The right and left rear wheels 2 are braked via the transmission shaft 14. It takes. In this case, the pedal 61a can be held in a depressed state by engaging a holding lever 71 described later with the pedal 61a in a state where the pedal 61a is depressed.

  As shown in FIGS. 1, 2, and 16, a step portion 67 located at the front of the fuselage, a cover portion 68 located above the engine 22 and the transmission case 5 (below the driver's seat 20), the step portion 67 and the cover portion. A floor 70 that covers the front part and the rear part of the airframe is integrally formed, including an inclined part 69 and the like that connect to 68. As shown in FIGS. 12 and 16, a short control tower 67 a is provided at the front of the step part 67, and a large opening 67 b is provided over almost the entire ceiling part of the control tower 67 a. An opening 67c is provided on the right lateral side of the control tower 67a. A holding lever 71 is supported at the front part of the opening 67c of the step part 67 so as to be swingable around the horizontal axis P9 in the front-rear direction, and as shown in FIGS. A pair of left and right mounting portions 67d are fixed to the left and right. As shown in FIG. 16, a cover 72 that can be attached to cover the opening 67b of the step portion 67 is provided. The cover 72 includes a cylindrical opening 72a, elongated holes 72b and 72c, and The cutout portion 72d is provided to form a flat plate shape.

  As shown in FIG. 16, a large opening 69 a is provided at the center of the inclined portion 69, and the opening 69 a of the inclined portion 69 extends to the step portion 67 and the cover portion 68. As shown in FIGS. 1, 2, and 16, a cover 73 is provided to cover the opening 69a of the inclined portion 69. The cover 73 includes a front wall portion 73a, right and left lateral wall portions 73b, an upper wall portion 73c, and an engagement member. The joint part 73d is provided and it is comprised integrally. The opening 69a of the inclined portion 69 is provided with a notch-shaped engaging portion 69b. By engaging the engaging portion 73d of the cover 73 with the engaging portion 69b of the inclined portion 69, the cover 73 is inclined. The opening 69 a of the inclined portion 69 is covered with the cover 73.

  With the above structure, when the floor 70 is attached to the fuselage, the handle post 43 (in the opening 67b of the step portion 67 as shown in FIGS. 2, 12, and 16 when the driver's seat 20 and the steering handle 45 are not attached. Steering handle 45 is not attached), while passing the speed change lever 52, the accelerator lever 54 and the grip part 59, and passing the pedal arm 61 through the opening 67c of the step part 67, the cover part 68 is shown in FIGS. (B) As shown in FIG. 10B, the mounting portion 67d of the step portion 67 is connected to the front wheel support case 12 by connecting it to the receiving member 17b and the horizontal frame 18 of the right and left vertical frames 17 shown in FIG. The floor 70 is attached to the fuselage.

  In this case, as shown in FIG. 16, since the openings 67b and 67c of the step portion 67 are configured to be sufficiently large, when the floor 70 is attached to the airframe as described above, the floor 70 is placed in an appropriate posture. Even if the floor 70 cannot be maintained (even if the floor 70 cannot be changed to an appropriate posture), the opening 67b of the step portion 67 is rubbed against the handle post 43, the transmission lever 52, the accelerator lever 54, and the grip portion 59, or the step portion There are few cases where the opening 67c of 67 is rubbed against the pedal arm 61.

  Next, as shown in FIGS. 2 and 16, while passing the handle post 43 (the steering handle 45 is not attached) through the opening 72a of the cover 72 and passing the speed change lever 52 through the opening 72b of the cover 72, The cover 72 is attached to the opening 67 b of the step portion 67 while the grip lever 59 is inserted into the notch 72 d of the cover 72 while the accelerator lever 54 is passed through the opening 72 c of the cover 72. Thereafter, the driver's seat 20 and the steering handle 45 are attached.

  When the floor 70 is attached to the fuselage as described above, the cover 73 (the opening 69a of the inclined portion 69) is positioned in front of the engine 22 below the driver seat 20 as shown in FIGS. It becomes. Accordingly, the front part of the engine 22 is opened by removing the engaging part 73d of the cover 73 from the engaging part 69b of the inclined part 69 and removing the cover 73. Therefore, the maintenance work of the engine 22 from the front of the engine 22 is performed. It can be performed. In this case, the front portion of the opening 69a of the inclined portion 69 is a step portion 67 that is relatively wide and has few obstacles, so that the maintenance work of the engine 22 from the front of the engine 22 can be performed without difficulty.

  As shown in FIGS. 16, 17, and 18, the cover 68 is provided with an opening 68 a, and a concentric circular convex 68 b is integrally formed with the cover 68 so as to surround the opening 68 a. The convex portion 68 b extends to the inclined rear end portion of the cover portion 68. Thereby, in the cover part 68, the ring-shaped collection | recovery part 68c is comprised between the opening part 68a and the convex part 68b, and the guide path 68d is between the pair of convex parts 68b in the rear-end part of the cover part 68. It is configured. As shown in FIG. 17, when the floor 70 is attached to the airframe, the fuel filler 21 a of the fuel tank 21 enters the opening 68 a of the cover 68. Accordingly, the filter 78 is placed on the step portion 21 c formed integrally with the fuel tank 21, and the cap 21 b is attached to the fuel filler port 21 a of the fuel tank 21.

  With the above structure, as described above, when the driver's seat 20 is lifted upward around the horizontal axis P1 (see FIG. 3) and tilted forward, the cap 21b is removed and fuel is supplied from the fuel filler port 21a of the fuel tank 21. 17 and 18, even if fuel is spilled from the fuel filler 21a of the fuel tank 21, the fuel spilled from the fuel filler 21a of the fuel tank 21 is recovered by the recovery part 68c of the cover part 68, It is guided by the guide path 68d of the section 68 and falls to the ground.

[Another Embodiment of the Invention]
In the above-described [Embodiment of the invention], the opening 67b of the step portion 67 shown in FIG. 16 is not a hole, but a concave shape that opens the front portion of the step portion 67 (the front portion of the control tower portion 67a). May be.
In the above-mentioned [Embodiments of the invention], instead of the right and left front wheels 1 having the spoke portions 1a as shown in FIGS. 10 and 11, a disk-shaped wheel portion (not shown) is used instead of the spoke portions 1a. The right and left front wheels 1 provided with) may be employed. In this case, the wheel portion is bent laterally outward to form the concave portions 1c of the right and left front wheels 1.

In the above-described [Embodiment of the invention], as shown in FIGS. 3 and 4, when the support frame 13 is installed across the front and rear wheel support cases 12, 6, the support frame 13 is used as the transmission case 5 and the front wheel. The support frame 13 may be constructed over the front and rear wheel support cases 12 and 6 by being connected to the support case 12.
In the above-described [Embodiment of the invention], the convex portion 68b of the cover portion 68 shown in FIGS. 16, 17, and 18 is eliminated, and the outer peripheral portion of the opening portion 68a of the cover 68 is made more than the other portions of the cover portion 68. You may comprise low and may comprise the collection | recovery part 68c of the cover part 68. FIG. Similarly, the convex portion 68 b of the cover portion 68 may be eliminated, and the guide path 68 d of the cover 68 may be configured to be lower than other portions of the cover portion 68.

Overall side view of riding rice transplanter Overall plan view of riding rice transplanter Side view of the vicinity of the engine, transmission case and rear wheel support case Plan view of the vicinity of the front wheel support case, support frame, engine, transmission case and rear wheel support case Cross-sectional plan view of rear wheel support case Rear view of rear wheel support case, right and left rear wheels Plan view of the vicinity of the transmission case, rear wheel support case, link mechanism, and hydraulic cylinder Plan view and side view of the vicinity of the step frame and auxiliary step Plan view and side view near the right and left vertical frames Rear view of front wheel support case, right and left front wheels Longitudinal rear view near the front wheel support case and front wheel support Side view near the front of the aircraft Longitudinal left side view near the steering member at the front of the aircraft Right side view near the steering member at the front of the fuselage Plan view of the vicinity of the operation arm and steering member Overall perspective view showing floor and cover Longitudinal side view near the fuel tank Top view near the fuel tank

Explanation of symbols

2 Rear wheel 3a Top link 3b Lower link 4 Seedling planting device 5 Mission case 5a Upper support bracket of the mission case 6 Rear wheel support case 6a Center portion 6b Axle support portion 6c Axle support portion support bracket 7 Cover case 11 Hydraulic cylinder

Claims (1)

A mission case and a rear wheel support case for supporting the right and left rear wheels are arranged at the rear of the aircraft,
The rear wheel support case includes a central portion and right and left axle support portions positioned at right and left ends, and the right and left axles are disposed outside the right and left axle support portions. A cover case separate from the support part is provided, and the right and left axle support parts are provided with support brackets,
The top link is integrally formed on the rear part of the upper part of the transmission case and is supported by the upper support bracket of the transmission case that extends rearward so as to swing up and down, and the lower link extends to the right and left. The support bracket of the axle support portion is supported so as to be swingable up and down and extends rearward, and the seedling planting device is supported at the rear of the top link and the lower link ,
The top link and the lower link are driven to swing up and down. The rear end of the hydraulic cylinder is connected to the lower link, and the top link supports the upper portion of the transmission case from both outer sides of the hydraulic cylinder. The riding type rice transplanter connected to the upper support bracket of the mission case together with the top link so as to be connected to the bracket .

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