Paddy field farming machine

Abstract

To reduce entry of foreign materials into a bonnet through opening parts in a paddy field working machine storing an engine and a fan in the bonnet provided in front of a machine body.SOLUTION: A paddy field working machine comprises: a bonnet including a plurality of right opening parts 95d provided on a right lateral face, and a plurality of left opening parts 96d provided on a left lateral face; and a fan configured to introduce air for cooling the engine into the inside of the bonnet through one opening parts 95d out of the right opening parts 95d and the left opening parts 96d. One opening parts 96d out of the right opening parts 95d and the left opening parts 96d are so configured that an air passage cross-sectional area of an inner side part of the bonnet in the one opening parts 96d is set different from an air passage cross-sectional area of an outer side part of the bonnet in the one opening parts 96d.SELECTED DRAWING: Figure 25

Description

[Technical field]

[0001] The present invention relates to a paddy field working machine such as a riding rice transplanter or a riding direct seeding machine. [Background technology]

[0002] In a riding rice transplanter, which is an example of a paddy field working machine, as disclosed in Patent Document 1, the engine and fan are housed in a bonnet located at the front of the machine body, and when the fan is rotated, an air flow in the left-right direction is generated, and air for cooling the engine is introduced into the inside of the bonnet through one of the right and left openings in the bonnet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-39889 A Summary of the Invention [Problem to be solved by the invention]

[0004] In paddy field working machines, there is concern that foreign objects such as crop and seedling waste and agricultural material waste may get into the inside of the bonnet through the opening, and there is a demand for methods to prevent foreign objects from getting inside the bonnet. The present invention aims to provide a configuration for a paddy field working machine in which the engine and fan are housed in a bonnet located at the front of the body, in which the number of foreign objects entering the interior of the bonnet through an opening is reduced. [Means for solving the problem]

[0005] The paddy field working machine of the present invention comprises an engine provided at the front of the body, a bonnet that houses the engine and has a plurality of right openings provided at the right side portion and a plurality of left openings provided at the left side portion, and a cooling device for cooling the engine. Outside airis introduced into the inside of the bonnet through one of the right opening and the left opening along the left-right direction. Outside air and a fan for generating a flow of the right opening and the left opening. On the other hand At the opening of On the other hand The inside portion of the bonnet at the opening of Outside air and the cross-sectional area of On the other hand The outer side portion of the bonnet at the opening of Outside air The cross-sectional area of ​​the The cross-sectional area through which the outside air passes at one of the openings is set to be larger than the smaller cross-sectional area through which the outside air passes at the other opening.

[0006] According to the present invention, the foreign object is On the other hand When attempting to enter the inside of the bonnet through the opening, the cross-sectional area of ​​the opening changes, making it easier for the foreign object to get caught in the middle of the opening, and making it more difficult for the foreign object to enter the inside of the bonnet. By making it difficult for foreign matter to enter the inside of the bonnet, the occurrence of abnormalities caused by foreign matter inside the bonnet can be reduced.

[0007]

[0008] According to the present invention, when the fan is driven to rotate, a flow of outside air is generated in the left-right direction, and the outside air for cooling the engine is introduced into the inside of the bonnet through one of the right and left openings in the bonnet. According to the present invention, the cross-sectional area for outside air to pass through at one opening of the bonnet is set to be larger than the smaller cross-sectional area for outside air to pass through at the other opening of the bonnet, so that the cross-sectional area for outside air to pass through at one opening of the bonnet is relatively large. This allows outside air for cooling the engine to be efficiently introduced into the inside of the bonnet through one opening of the bonnet, thereby improving the engine cooling efficiency. In the present invention, it is preferable that the cross-sectional area of the outside air passing through the one opening is set to be the same as the larger cross-sectional area of the outside air passing through the other opening. be.

[0009] In the present invention, the output shaft of the engine is provided at a portion of the engine facing the On the other hand opening, and inside the bonnet, between the on the other hand opening and the engine, the fan and a radiator arranged along the front-rear direction are provided. The fan is provided between the radiator and the engine, and it is preferable that a dust-proof member is provided at a portion of the radiator facing the on the other hand opening.

[0010] According to the present invention, the on the other hand cross-sectional area of the Outside air passing through the opening of the bonnet is set to be larger than the On the other hand cross-sectional area of the Outside air passing through the opening of the bonnet. As a result, the On the other hand cross-sectional area of the Outside air passing through the opening of the bonnet is relatively small. Thereby, the possibility that foreign matter enters the inside of the bonnet from the On the other hand opening of the bonnet is small.

[0011] Since the output shaft of the engine is provided at a portion of the engine facing the On the other hand opening of the bonnet, the possibility that foreign matter enters the inside of the bonnet from the On the other hand opening of the bonnet and contacts the output shaft of the engine is reduced. Thereby, it is advantageous in terms of preventing damage near the output shaft of the engine.

[0012] According to the present invention, in the case of a water-cooled engine, since the radiator and the fan are provided inside the bonnet between the on the other hand opening of the bonnet and the engine, the Outside airBy supplying the radiator with the above-mentioned air, it is possible to improve the cooling efficiency of the engine.

[0013] Bonnet on the other hand At the opening of Outside air The cross-sectional area of ​​the passage is relatively large, so foreign objects can easily get into the bonnet. on the other hand It is possible for a firearm to enter the hood through an opening in the hood. According to the present invention, if a foreign object is in the bonnet, on the other hand Even if foreign matter enters the inside of the bonnet through the opening, it is stopped by the dustproof member and therefore the foreign matter is unlikely to hit the radiator. Since the fan is provided between the radiator and the engine, even if a foreign object enters the inside of the bonnet through one of the openings of the bonnet, the foreign object will not come into contact with the fan.

[0014] In the present invention, On the other hand The opening of the On the other hand The width of the opening of the bonnet is larger than the front-rear width and the top-bottom width of the inner part of the bonnet. On the other hand It is preferable that the opening be formed in such a way that the front-to-rear width and the top-to-bottom width of the portion of the bonnet facing the exterior of the bonnet are increased outward.

[0015] According to the present invention, the bonnet On the other hand The opening is formed to have a predetermined left-right width along the left-right direction, and is formed to spread outward. This prevents foreign objects from entering the bonnet. On the other hand When the vehicle tried to enter the bonnet through the opening, On the other hand The opening of the bonnet is shaped to expand outwards, so foreign matter can easily get into the On the other hand This makes it easier for the air to escape to the outside through the opening.

[0016] In the present invention, the machine is provided with a floor, a step provided at the rear of the machine and positioned higher than the floor, and an agricultural material supplying device arranged in the left-right direction rearward of the rear of the step and capable of supplying agricultural materials to the rice field surface, the agricultural material supplying device having a hopper for storing agricultural materials, a feed section connected to the lower part of the hopper for feeding the agricultural materials from the hopper, an air blowing section for generating a conveying air for transporting the agricultural materials to the rice field surface, and a conveying air duct connected in the left-right direction between the feed section and the air blowing section for supplying the conveying air of the air blowing section to the feed section, and it is preferable that, when viewed from the front, the upper surface of the step and the conveying air duct overlap over the entire length of the conveying air duct.

[0017] In paddy field working machines, a floor is provided on the body of the machine, and a step is provided at the rear of the body at a position higher than the floor, and an agricultural material supplying device capable of supplying agricultural materials to the rice field surface is arranged along the left-right direction rearward of the rear of the step. The agricultural material supplying device is provided with a hopper for storing agricultural materials, a delivery section connected to the bottom of the hopper for delivering the agricultural materials from the hopper, and a blowing section for generating a conveying air for transporting the agricultural materials to the rice field surface, and a conveying air duct for supplying the conveying air from the blowing section to the delivery section is connected in the left-right direction between the delivery section and the blowing section.

[0018] According to the present invention, the upper surface of the step and the conveying air duct overlap over the entire length of the conveying air duct when viewed from the front, and the fertilizer applicator is provided at a relatively low position. This makes it possible to lower the center of gravity of the paddy field working machine equipped with the agricultural material supplying device, which is advantageous in terms of improving the running performance of the paddy field working machine.

[0019] In the present invention, the air blowing section has an air blower case connected to the right or left part of the conveying air duct, air blower blades housed in the air blower case so as to be rotatable around an axis along the vertical direction, and an electric motor which rotates the air blower blades, and it is preferable that, when viewed from the front, the upper surface of the step and the air blower case overlap.

[0020] The air blowing section provided in the fertilizer application device often has an air blower case connected to the right or left part of the conveying air duct, and the air blower blades are housed in the air blower case so that they can rotate around an axis along the vertical direction, and an electric motor is provided to rotate the air blower blades.

[0021] According to the present invention, when viewed from the front, the upper surface of the step and the blower case (blower blade) overlap, and the blower case (blower blade) is provided at a relatively low position, which is advantageous in terms of improving the running performance of the paddy field working machine.

[0022] In the present invention, it is preferable that an intake duct that draws in air near the engine and guides it to the blowing section extends downward from the blowing section, and extends with its lower side toward the engine relative to the step.

[0023] In paddy field working machines equipped with a fertilizer application device, in order to prevent the fertilizer from clogging due to moisture, the machine is sometimes configured to supply relatively hot air near the engine to the blower section of the agricultural material supply device, and then from the blower section to the payout section via a conveying air duct.

[0024] According to the present invention, the intake duct, which draws in air near the engine and guides it to the blower, extends downward from the blower and extends the lower side of the step toward the engine. This means that the intake duct does not protrude from the top surface of the step, making it easier for workers to work on the step.

[0025] In the present invention, it is preferable that right and left handrail frames are provided at positions laterally outward from the right and left parts of the step, and the intake duct is arranged below the lower part of the right or left handrail frame.

[0026] According to the present invention, the right and left handrail frames are provided at positions laterally outboard of the right and left parts of the step, so that the worker can stabilize his or her body by holding onto the handrail frames. According to the present invention, the intake duct is positioned below the lower part of the right or left handrail frame, so that the intake duct can be provided below the step while reasonably avoiding interference with the lower part of the right or left handrail frame.

[0027] In the present invention, it is preferable that the right portion of the step extends rearward so as to be positioned laterally outward from the right part of the agricultural material supplying device, and the left portion of the step extends rearward so as to be positioned laterally outward from the left part of the agricultural material supplying device.

[0028] According to the present invention, the right and left portions of the step are positioned laterally outward from the right and left portions of the agricultural material supplying device, so that the right and left portions of the step function as protective members for the agricultural material supplying device, which is advantageous in terms of preventing damage to the agricultural material supplying device. [Brief description of the drawings]

[0029] [Figure 1] FIG. 2 is a left side view of the riding rice transplanter. [Diagram 2] FIG. 2 is a plan view of a riding rice transplanter. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a plan view of the vicinity of the right and left floor frames. [Figure 6] FIG. 2 is a plan view of the vicinity of the vehicle body frame, the front step frame, and the rear step frame. [Figure 7] FIG. 2 is a left side view of the vicinity of the body frame, floor frame, front step frame, and rear step frame. [Figure 8] FIG. 2 is a vertical sectional front view of the vicinity of a spring support member and a suspension spring. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 2 is a plan view of the right step and the left step. [Figure 13] FIG. 4 is a bottom view of the right step and the left step. [Figure 14] FIG. 2 is a vertical sectional front view of the vicinity of the right step and the left step. [Figure 15] FIG. 2 is a longitudinal sectional left side view of the area around the right and left legs of the seat. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. [Figure 19] FIG. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] FIG. [Figure 23] FIG. [Figure 24] FIG. [Diagram 25] FIG. 2 is a vertical sectional front view of the right and left side panels. [Figure 26] A diagram showing the opening in the right side panel and the opening in the left side panel. [Figure 27] FIG. 2 is a left side view of the vicinity of the engine and the transmission case. [Figure 28] FIG. 2 is a plan view of the engine, the transmission case, and the vicinity thereof. [Figure 29] FIG. 4 is a vertical sectional front view of the vicinity of a fertilizer application device in a first alternative embodiment of the invention. [Diagram 30] FIG. 4 is a rear view of the fertilizer application device and its surrounding area in the first alternative embodiment of the invention. [Diagram 31] FIG. 4 is a left side view of the vicinity of the fertilizer application device in the first alternative embodiment of the invention. [Diagram 32] FIG. 4 is a vertical sectional left side view of the vicinity of a fertilizer application device in a first alternative embodiment of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Figures 1 to 32 show a riding rice transplanter, which is an example of a paddy field working machine, and in Figures 1 to 32, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

[0031] (Overall configuration of riding rice transplanter) 1 and 2, a machine body frame 3 is supported by right and left front wheels 1 for traveling and right and left rear wheels 2 for traveling. A link mechanism 4 extends rearward from the rear of the machine body frame 3, and a seedling planting device 5, which is a working device, is supported at the rear of the link mechanism 4.

[0032] As shown in Figures 1 and 5, the transmission case 25 is connected to the front of the body frame 3, and a support frame 42, which is frame-shaped in a planar view, is connected to the front of the transmission case 25 and extends forward.

[0033] An engine 49 is supported by the support frame 42 and provided at the front of the vehicle frame 3, and a bonnet 58 is provided to house the engine 49. A steering handle 59 for steering the front wheels 1 is provided behind the bonnet 58.

[0034] 1 and 2, a floor 38 is provided on the machine body frame 3, and a step 43 is provided at the rear of the machine body frame 3 so as to be located at a position higher than the floor 38. A driver's seat 60 is located in the center of the left and right sides in front of the step 43, and a seat 87 is provided on the step 43.

[0035] (Configuration of seedling planting device and spare seedling stand) As shown in Figures 1 and 2, the seedling planting device 5 is configured as an 8-row planting type and has four planting transmission cases 6 supported at the rear of the link mechanism 4, a rotating case 7 rotatably supported on the right and left rear parts of the planting transmission cases 6, a pair of planting arms 8 supported on the rotating cases 7, multiple floats 9, and a seedling tray 10.

[0036] The right and left support frames 61 are connected to the right and left parts of the support frame 42 and extend upwardly outward from the front right and front left parts of the floor 38, and a spare seedling stand 62 is attached to the upper part of the support frame 61. The spare seedling stand 63 is attached to the lower part of the support frame 61, the spare seedling stand 64 is attached to the front part of the spare seedling stand 63 so as to be able to swing up and down, and the spare seedling stand 65 is attached to the rear part of the spare seedling stand 63 so as to be able to swing up and down.

[0037] (Aircraft frame configuration) 5, 6 and 7, the right and left body frames 3 are arranged along the front-to-rear direction, and the body frames 3 are made of rectangular pipes with a square cross section. The right and left connecting parts 11 are connected downward to the front of the body frames 3, and the right and left frames 12 are connected between the lower parts of the connecting parts 11 and the front-to-rear middle parts of the body frames 3. A transmission case 25 is connected to the front of the body frames 3 and the connecting parts 11.

[0038] The right and left flat plate-shaped vertical frames 13 and the right and left square pipe-shaped vertical frames 14, 15, 16 are connected to the aircraft frame 3 and extend upward from the aircraft frame 3. The right and left square pipe-shaped horizontal frames 17 are connected to the upper parts of the vertical frames 13, 14, 15 in the front-to-rear direction. The right and left square pipe-shaped horizontal frames 18 are connected to the upper parts of the vertical frames 15, 16 in the front-to-rear direction.

[0039] A square pipe-shaped horizontal frame 19 is connected in the left-right direction across the lower parts of the body frame 3 and the vertical frames 13. A square pipe-shaped horizontal frame 21 is connected in the left-right direction across the horizontal frame 17, and a square pipe-shaped horizontal frame 22 is connected in the left-right direction across the upper parts of the vertical frames 16. An angle-shaped horizontal frame 23 (see FIG. 8) is connected in the left-right direction across the rear of the body frame 3.

[0040] An upper link 4a of the link mechanism 4 is supported by an upper portion of the vertical frame 16 so as to be able to swing up and down about an axis P1 along the left-right direction, and extends rearward. A lower link 4b of the link mechanism 4 is supported by the rear of the body frame 3 so as to be able to swing up and down about an axis P2 along the left-right direction, and extends rearward.

[0041] A hydraulic cylinder 24 is connected between the axis P1 of the vertical frame 16 and the rear of the lower link 4b of the link mechanism 4, and the extension and contraction of the hydraulic cylinder 24 causes the link mechanism 4 to swing up and down. With the above-mentioned configuration, the link mechanism 4 (upper link 4a and lower link 4b) is supported by the rear part (vertical frame 16) of the machine body frame 3 and extends rearward.

[0042] (Front and rear wheel support configuration) As shown in Figures 1 and 5, right and left front axle cases 26 are connected to the right and left portions of the transmission case 25 and extend outwardly to the right and left, and the right and left front wheels 1 are supported by the front axle cases 26 in a steerable manner.

[0043] 1 and 7, a rear axle case 27 is provided which supports right and left rear wheels 2. Right and left brackets 28 are connected to the front-to-rear intermediate portion of the vehicle frame 3, and right and left upper links 29 are supported by the brackets 28 and extend rearward so as to be vertically swingable about an axis P3 along the left-right direction. Right and left lower links 30 are supported by lower portions of the connecting portion 11 and extend rearward so as to be vertically swingable about an axis P4 along the left-right direction.

[0044] As shown in Figures 7 and 8, the rear of the upper link 29 is connected to the upper part of the front part of the rear axle case 27 so as to be able to swing up and down, and the rear of the lower link 30 is connected to the connecting pin 20 at the lower part of the front part of the rear axle case 27 so as to be able to swing up and down.

[0045] A bracket 31 is connected downward to the rear of the right vehicle frame 3. A lateral rod 32 is supported by the bracket 31 so as to be able to swing up and down around an axis P5 along the front-rear direction, and extends toward the left. The left portion of the lateral rod 32 is connected to the rear of the rear axle case 27 so as to be able to swing up and down.

[0046] Right and left spring support members 33 are attached to the rear of the vehicle frame 3, and right and left coil-shaped suspension springs 34 are attached between the spring support members 33 and the connection pin 20 of the rear axle case 27, and the rear axle case 27 is supported on the vehicle frame 3 via the suspension springs 34.

[0047] With the above configuration, the right and left upper links 29, the right and left lower links 30, the lateral rod 32, and the right and left suspension springs 34 form a five-link type suspension mechanism, and the rear axle case 27 is supported on the vehicle frame 3 via the suspension mechanism.

[0048] (Configuration of spring support member) As shown in Figures 8 and 9, the spring support member 33 is composed of a flat plate and has a main body portion 33a that extends in the left-right direction, a right mounting portion 33b formed by bending the right front and right rear portions of the main body portion 33a upward, and a left mounting portion 33c formed by bending the left front and left rear portions of the main body portion 33a upward.

[0049] The main body 33a of the spring support member 33 is attached to the lower part 3a of the body frame 3 by welding, extends rightward from the right side part 3b of the body frame 3, and extends leftward from the left side part 3c of the body frame 3.

[0050] The right mounting portion 33b of the spring receiving member 33 is attached by welding to the right side portion 3b of the body frame 3. In this way, the right mounting portion 33b of the spring receiving member 33 is attached across the portion of the main body portion 33a of the spring receiving member 33 that extends rightward from the right side portion 3b of the body frame 3 and the right side portion 3b of the body frame 3.

[0051] The left mounting portion 33c of the spring receiving member 33 is attached by welding to the left side portion 3c of the body frame 3. In this way, the left mounting portion 33c of the spring receiving member 33 is attached across the portion of the main body portion 33a of the spring receiving member 33 that extends leftward from the left side portion 3c of the body frame 3 and the left side portion 3c of the body frame 3.

[0052] There are provided right and left flat connecting members 35, and the cylindrical portions 35a are connected downward to the connecting members 35. Right and left rods 36 are attached to the connecting pins 20 of the rear axle case 27 and extend upward. The rods 36 are inserted into the cylindrical portions 35a of the connecting members 35 so as to be slidable in the up-down direction.

[0053] The cylindrical portion 35a and rod 36 of the connecting member 35 are positioned inside the suspension spring 34, and the upper portion of the suspension spring 34 is abutted against the connecting member 35, and the connecting member 35 is connected to the main body portion 33a of the spring support member 33 by a bolt 37. The right and left spring receiving members 33 and the right and left connecting members 35 are symmetrical and have the same structure.

[0054] (Configuration of attachment between vertical frame and spring support member) As shown in Figures 8 and 9, the lower part of the vertical frame 15 (see the above-mentioned (Configuration of the aircraft frame) and Figures 6 and 7) is cut out, and a horizontal portion 15a and an extension portion 15b extending downward from the horizontal portion 15a are formed at the lower part of the vertical frame 15, and a slit 15c is formed in the extension portion 15b.

[0055] The horizontal portion 15a of the vertical frame 15 is abutted against the upper portion 3d of the body frame 3 and attached by welding. The left mounting portion 33c of the spring receiving member 33 is inserted into the slit 15c of the vertical frame 15, and the horizontal portion of the extending portion 15b of the vertical frame 15 is abutted against the left side portion 3c of the body frame 3 and attached by welding. The lower portion of the extending portion 15b of the vertical frame 15 is abutted against the main body portion 33a of the spring receiving member 33 and attached by welding.

[0056] The lower parts of the right and left vertical frames 15 are symmetrical and have the same structure. The mounting structure between the lower part of the right vertical frame 15 and the right spring bearing member 33 and the mounting structure between the lower part of the left vertical frame 15 and the left spring bearing member 33 are symmetrical and have the same structure.

[0057] With the above configuration, the lower part of the vertical frame 15 is attached across the upper part 3d of the machine body frame 3, the side parts 3b, 3c of the machine body frame 3, and the part of the main body part 33a of the spring receiving member 33 extending from the side parts 3b, 3c of the machine body frame 3, and the lower part of the vertical frame 15 is attached across the spring receiving member 33 and the machine body frame 3. The vertical frame 15 is attached to the spring receiving member 33 and extends upward from the spring receiving member 33.

[0058] (Overall floor layout) 1 and 2, the floor 38 has a front floor 39, a right floor 40, and a left floor 41. A rubber floor mat (not shown) is placed across the right floor 40 and the left floor 41.

[0059] The front floor 39 is made of synthetic resin and is integrally formed, extending over the right and left areas of the bonnet 58, and is configured in a bilaterally symmetrical shape. An opening 39a is formed in the front floor 39 above the front wheels 1, and has a plurality of crosspieces arranged at intervals along the lateral direction. An operator can visually check the front wheels 1 (see FIG. 1) through the opening 39a of the front floor 39.

[0060] The right floor 40 is provided so as to be connected to the right rear part of the front floor 39, and the left floor 41 is provided so as to be connected to the left rear part of the front floor 39. The right floor 40 and the left floor 41 are integrally formed from synthetic resin and are formed in a symmetrical shape.

[0061] Openings 40a, 41a are provided in the right floor 40 and the left floor 41 above the front wheel 1, with multiple crosspieces arranged at intervals along the lateral direction. An operator can visually check the front wheel 1 (see FIG. 1) through the openings 40a, 41a in the right floor 40 and the left floor 41.

[0062] (Configuration of the floor frame that supports the floor) As shown in Figures 5, 6 and 7, the right and left floor frames 50 are provided across the right and left body frames 3 and the support frame 42, and the right and left floor frames 50 are configured to be symmetrical.

[0063] On the floor frame 50, horizontal frames 51, 52 are provided along the left-right direction, and three frames 53 along the front-rear direction are connected across the horizontal frames 51, 52, and the ends of the horizontal frames 51, 52 are connected to the machine frame 3. A footrest 70 (see Figs. 1 and 2) for an operator to use when getting on and off is connected across the horizontal frames 51 and the outermost frame 53.

[0064] Two frames 54 extending in the front-rear direction are connected to the horizontal frame 52 and extend forward, and a horizontal frame 55 extending in the left-right direction is connected between the outermost frames 53 and 54. A frame 56 extending in the front-rear direction is connected to the horizontal frame 55 and extends forward, and a horizontal frame 57 extending in the left-right direction is connected between the front portions of the frames 54, 56, and an end of the horizontal frame 57 is connected to the front portion of the support frame 42.

[0065] With the above configuration, in the floor 38, the right part of the front floor 39 and the right floor 40 are attached to the right floor frame 50 and supported from below by the right floor frame 50. The left part of the front floor 39 and the left floor 41 are attached to the left floor frame 50 and supported from below by the left floor frame 50.

[0066] (Overall structure of steps) As shown in Figures 1, 2 and 3, the step 43 has a right step 44 which is a front step, a left step 45 which is a front step, right and left rear steps 46, right and left rear steps 47, and right and left lateral steps 48.

[0067] (Right and left step configuration) As shown in Figures 11 and 12, the right step 44 and the left step 45 have upper surface portions 44a, 45a, front surface portions 44b, 45b, side surface portions 44c, 44c, and extension portions 44d, 45d, and are integrally constructed from synthetic resin and are configured in a left-right symmetrical shape except for one part.

[0068] Openings 44e, 45e are provided in the upper surface portions 44a, 45a, and a plurality of crosspieces 44f, 45f are provided in the openings 44e, 45e so as to be aligned at intervals along the lateral direction. The openings 44e, 45e are located above the rear wheel 2 (see FIG. 1), and the worker can visually observe the rear wheel 2 through the openings 44e, 45e of the right step 44 and the left step 45.

[0069] The front surface portions 44b, 45b are connected to the front portions of the upper surface portions 44a, 45a and extend downward. The lateral surface portions 44c, 45c are connected across the lateral portions of the upper surface portions 44a, 45a and the lateral portions of the front surface portions 44b, 45b. The extension portions 44d, 45d are connected to the lower portions of the front surface portions 44b, 45b and extend forward. The cutout portions 44g, 45g are provided across the upper surface portions 44a, 45a and the front surface portions 44b, 45b.

[0070] Walls 44h, 45h are formed on the sides of the upper surface portions 44a, 45a in the front-rear direction so as to be higher than the upper surface portions 44a, 45a. Walls 44i, 45i are formed on the rear parts of the upper surface portions 44a, 45a in the left-right direction so as to be higher than the upper surface portions 44a, 45a. In the right step 44, a protruding portion 44q that protrudes forward is provided on a lateral portion of the front surface portion 44b, and an opening portion 44r is formed in the upper portion of the protruding portion 44q.

[0071] As shown in Figures 11 to 14, a plurality of protruding portions 44j, 45j, 44k, 45k protruding downward are provided on the undersides of the upper surface portions 44a, 45a and the lower parts of the extension portions 44d, 45d, and a number of vertical wall-shaped ribs 44m, 45m are provided along the front-rear, left-right and diagonal directions across the protruding portions 44j, 45j, 44k, 45k.

[0072] The protrusions 44j, 45j are formed to be recessed downward from the upper surface portions 44a, 45a and the extending portions 44d, 45d, and a recess that extends downward is formed at the top of the protrusions 44j, 45j, and the protrusions 44j, 45j are open upward. Small openings 44n, 45n and water drainage portions 44p, 45p are opened at the bottoms of the protrusions 44j, 45j.

[0073] The protrusions 44k, 45k are formed in a cylindrical shape extending downward from the upper surface portions 44a, 45a and the extending portions 44d, 45d, and are open downward. The bottoms of the protrusions 44j, 45j and the lower ends of the protrusions 44k, 45k are set at the same height, and the lower ends of the ribs 44m, 45m are set at a higher position than the bottoms of the protrusions 44j, 45j and the lower ends of the protrusions 44k, 45k.

[0074] (Configuration of the next step in a step) As shown in FIGS. 16, 17 and 18, the right rear step 46 and the left rear step 46 are the same, and the rear steps 46 are integrally made of synthetic resin and are configured to have a symmetrical shape.

[0075] The rear step 46 is provided with a main body 46a, an opening 46b is opened in the left-right center of the main body 46a, and a plurality of crosspieces 46c are provided in the opening 46b so as to be aligned at intervals along the lateral direction. The opening 46b is located above the rear wheel 2, and an operator can visually check the rear wheel 2 (see FIG. 1) through the opening 46b of the rear step 46.

[0076] A plurality of protrusions 46d, 46e protruding downward are provided on the lower part of the main body 46a, and a number of vertical wall-shaped ribs 46f are provided along the front-rear and left-right directions across the protrusions 46d, 46e.

[0077] The protrusion 46d is formed to be recessed downward from the main body 46a, and a recess that recesses downward is formed in the upper surface of the protrusion 46d, and the protrusion 46d is open upward. A small opening 46g and a water drainage portion 46h are opened at the bottom of the protrusion 46d.

[0078] The protruding portion 46e is formed in a cylindrical shape extending downward from the main body portion 46a and is open downward. The bottom of the protruding portion 46d, the lower end of the protruding portion 46e, and the lower end of the rib 46f are set at the same height.

[0079] As shown in FIG. 19, the right rear step 47 and the left rear step 47 are the same, and the rear steps 47 are integrally made of synthetic resin and are configured to have a symmetrical shape. The rear step 47 is provided with a main body portion 47a, an opening 47b, a ridge portion 47c and a protrusion 47d which are the same as the main body portion 46a, the opening 46b, the ridge portion 46c and the protrusion 46d of the rear step 46, and is provided with a protrusion (not shown), a rib (not shown), an opening (not shown) and a water drainage portion (not shown) which are the same as the protrusion 46e, the rib 46f, the opening 46g and the water drainage portion 46h of the rear step 46.

[0080] In the step 47, a wall portion 47i is formed in the rear portion of the main body portion 47a along the left-right direction so as to be higher than the main body portion 47a. The rear step 47 has the same shape as the rear step 46, except for having the wall portion 47i.

[0081] (Horizontal step configuration in steps) 20, 21, and 22, the horizontal step 48 has a first portion 48a and a second portion 48b that are separated from each other, and the first portion 48a and the second portion 48b are integrally formed from a synthetic resin. In the right and left horizontal steps 48, the first portion 48a and the second portion 48b are the same.

[0082] The first portion 48a is configured with crosspieces arranged in a lattice pattern along the front-to-back and left-to-right directions, and a wall portion 48c protruding downward is formed on the side of the first portion 48a along the front-to-back direction.

[0083] The second part 48b is configured with crosspieces arranged in a lattice pattern along the front-to-back and left-to-right directions, and wall parts 48d protruding upward and downward are formed along the front-to-back directions on the sides of the second part 48b.

[0084] When the horizontal step 48 is used as the right horizontal step 48, the first portion 48a is set so that the wall portion 48c is located on the right lateral outer side and faces downward. The second portion 48b is disposed on the right side of the first portion 48a, and is set so that one wall portion 48d faces upward and the other wall portion 48d faces downward.

[0085] When using the horizontal step 48 as the left horizontal step 48, the first portion 48a is reversed (flipped) relative to the right first portion 48a so that the wall portion 48c is positioned on the left outer lateral side and faces downward. The second part 48b is reversed (flipped upside down) relative to the right second part 48b and placed on the left side of the first part 48a, with one wall portion 48d facing downward and the other wall portion 48d facing upward.

[0086] (Overall structure of the step frame that supports the steps) As shown in FIGS. 6 and 7, a step frame 66 is provided to support the step 43 from below, and the step frame 66 is supported by the machine frame 3.

[0087] As shown in Figures 6 and 7, the step frame 66 has a front step frame 67 that supports the front steps, that is, the right step 44 and the left step 45, from below, and a rear step frame 68 that supports the rear steps 46, 47 from below, and as shown in Figures 1, 4 and 31, has a lateral step frame 69 that supports the lateral step 48 from below.

[0088] (Configuration of the front step frame supporting the right and left steps) 6 and 7, horizontal frames 71, 72 extending in the left-right direction are provided on the front step frame 67, and a mounting bracket 71a is attached to the horizontal frame 71. A frame 73 extending in the front-rear direction is connected across the horizontal frames 71, 72.

[0089] A frame 74 extending along the front-rear direction is connected across the lateral ends of the horizontal frames 71, 72 and extends forward from the horizontal frame 72. A frame 75 extending along the front-rear direction is connected to the horizontal frame 72 and extends forward. A horizontal frame 76 extending along the left-right direction is connected across the front ends of the frames 74, 75. A support frame 77 extending along the front-rear direction is connected to the horizontal frame 71 and extends rearward.

[0090] In the front step frame 67 configured as above, the horizontal frame 71 is connected to the upper parts of the right and left vertical frames 15 (see the above-mentioned (Configuration of the Machine Body Frame)) and the right and left horizontal frames 17. The horizontal frame 72 is connected to the upper parts of the right and left vertical frames 14 and the right and left horizontal frames 17. As a result, the step frame 66 (front step frame 67) is attached to the upper part of the vertical frame 15 and is attached to the upper part of the vertical frame 14.

[0091] (Relationship between floor frame and step frame) 6 and 7, the right and left floor frames 50 are provided at the front of the body frame 3. The front step frame 67 (step frame 66) is provided at the rear of the body frame 3 so as to be located at a higher position than the floor frames 50.

[0092] Multiple right connecting frames 79 are attached in the vertical direction across the right front portion (right horizontal frame 76) of the step frame 66 (front step frame 67) and the right rear portion (horizontal frame 51 of the right floor frame 50).

[0093] Multiple left connecting frames 79 are attached in the vertical direction across the left front portion (left horizontal frame 76) of the step frame 66 (front step frame 67) and the left rear portion (horizontal frame 51 of the left floor frame 50).

[0094] As shown in Fig. 10, a fuel tank 80 is provided. A front lower portion of the fuel tank 80 is attached to the horizontal frame 51 of the right floor frame 50, and a rear upper portion of the fuel tank 80 is attached to the right portion of the horizontal frame 72 of the front step frame 67. As a result, the fuel tank 80 is provided below the right front portion of the step frame 66 (front step frame 67). The right outermost connecting frame 79 is disposed vertically at a right lateral outer position relative to the fuel tank 80 .

[0095] (Support structure of right and left steps on front step frame) As described above (Configuration of the right and left steps in the steps) and as shown in Figs. 11 to 14, the right step 44 and the left step 45 are provided with protrusions 44j, 45j, 44k, 45k, ribs 44m, 45m, and crosspieces 44f, 45f.

[0096] 6 and 14, when the right step 44 and the left step 45 are placed on the front step frame 67, the protruding portions 44j, 45j, 44k, 45k of the right step 44 and the left step 45 are placed on the frames 73, 75 and the receiving frame 77 of the front step frame 67. The ribs 44m, 45m and the crosspieces 44f, 45f of the right step 44 and the left step 45 are placed on the horizontal frames 71, 72 of the front step frame 67. As a result, the right step 44 and the left step 45 are supported from below by the front step frame 67 (step frame 66).

[0097] As shown in Figure 14, in the protruding portions 44j, 45j of the right step 44 and the left step 45, the bolts 81 enter the protruding portions 44j, 45j of the right step 44 and the left step 45, and are attached across the protruding portions 44j, 45j of the right step 44 and the left step 45 and the frames 73, 75 and the receiving frame 77 of the front step frame 67. As a result, the right step 44 and the left step 45 are connected to the front step frame 67 (step frame 66).

[0098] (Configuration of rear step frame supporting rear step) 6 and 7, a horizontal frame 82 extending in the left-right direction is provided on the rear step frame 68, and a plurality of support frames 83 extending in the front-rear direction are connected to the horizontal frame 82 and extend forward and rearward. A mounting bracket 84 is attached to the horizontal frame 82, and a mounting frame 85 is connected to the horizontal frame 82 and extends forward.

[0099] In the front step frame 67 and the rear step frame 68, the mounting bracket 84 of the rear step frame 68 is bolted to the rear of the horizontal frame 18 (see the above (Configuration of the Machine Frame)). The mounting frame 85 of the rear step frame 68 is bolted to the mounting bracket 71a of the horizontal frame 71 of the front step frame 67 (see the above (Configuration of the Front Step Frame Supporting the Right and Left Steps)).

[0100] As a result, the rear step frame 68 is attached to the front step frame 67, and the rear step frame 68 is attached to the top of the vertical frame 15 (see the above-mentioned (Configuration of the aircraft frame)) via the front step frame 67, and is attached to the top of the vertical frame 14.

[0101] (Support structure of rear step in rear step frame) As described above (Configuration of the Rear Step in the Step) and as shown in Figs. 16 to 19, the rear steps 46, 47 are provided with the protrusions 46d, 47d, 46e, the rib 46f, and the crosspieces 46c, 47c.

[0102] When the rear steps 46 , 47 are placed on the rear step frame 68 , the protrusions 46 d , 47 d , 46 e , the rib 46 f , and the crosspieces 46 c , 47 c of the rear steps 46 , 47 are placed on the receiving frame 83 of the rear step frame 68 . As a result, the rear steps 46, 47 are supported from below by the rear step frame 68 (step frame 66).

[0103] Similar to the right step 44 and left step 45 described above (support configuration of the right and left steps on the front step frame) and shown in Figure 14, in the rear steps 46, 47, bolts 81 are inserted into the protruding portions 46d, 47d of the rear steps 46, 47 and are attached across the protruding portions 46d, 47d of the rear steps 46, 47 and the receiving frame 83 of the rear step frame 68. As a result, the rear steps 46, 47 are connected to the rear step frame 68 (step frame 66).

[0104] (Configuration of the horizontal step frame supporting the horizontal step) As shown in Figures 1, 2, 3, 4 and 31, right and left handrail frames 86 are provided which are formed by bending a pipe material.

[0105] The front lower part 86a of the handrail frame 86 is connected to the horizontal frame 51 of the floor frame 50 (see the above (Configuration of the floor frame that supports the floor) and Figure 5). The rear lower part 86b of the handrail frame 86 is connected to the horizontal frame 71 of the front step frame 67 (see the above (Configuration of the front step frame that supports the right and left steps) and Figure 6).

[0106] The right and left lateral step frames 69 are disposed along the front-rear direction and are connected to the rear lower portion 86b of the handrail frame 86. The lateral step 48 (first portion 48a and second portion 48b) is connected to the lateral step frames 69 with bolts.

[0107] As a result, the right handrail frame 86 and the side step frame 69 and the left handrail frame 86 and the side step frame 69 are configured to be symmetrical. The right and left handrail frames 86 are disposed at positions laterally outside the right part of the right step 44 and at positions laterally outside the left part of the left step 45, and extend upward.

[0108] (Arrangement of right and left steps, rear steps, and side steps) As shown in Figures 3, 11, and 12, the right step 44 and the left step 45 are arranged side by side in the left-right direction so as to be in contact with each other, and are arranged to connect to the rear of the right floor 40 and the left floor 41 (see the above-mentioned (Overall structure of the floor) and Figure 2).

[0109] An upper surface 44a of the right step 44 and an upper surface 45a of the left step 45 are disposed at the same height. An upper end portion of a wall portion 44i of the right step 44 and upper ends of wall portions 45h, 45i of the left step 45 are disposed at the same height.

[0110] The right step 44 covers the fuel tank 80, with the right front portion of the fuel tank 80 fitting into the overhanging portion 44q of the right step 44, and the fuel filler port 80a of the fuel tank 80 fitting into the opening 44r of the right step 44 and protruding upward.

[0111] The driver's seat 60 is disposed in the notches 44g, 45g of the right step 44 and the left step 45, and is disposed in the left-right center of the front part of the step 43 (the right step 44 and the left step 45).

[0112] 3, the right and left rear steps 46 are arranged side by side in the left-right direction so as to be in contact with each other, and are provided so as to be connected to the rear part (wall part 44i) of the right step 44 and the rear part (wall part 45i) of the left step 45. The right and left rear steps 47 are arranged side by side in the left-right direction so as to be in contact with each other, and are provided so as to be connected to the rear part of the rear step 46.

[0113] The upper surfaces of the rear steps 46 and 47 (main body portions 46a and 47a) are disposed at the same height as the upper ends of the wall portions 44h, 45h, 44i and 45i of the right step 44 and the left step 45.

[0114] As shown in Figures 3 and 4, the right lateral step 48 is provided so as to be connected to the lateral portion (wall portion 44h) of the right step 44 and the lateral portions (wall portion 45h) of the right rear steps 46, 47, and the left lateral step 48 is provided so as to be connected to the lateral portion of the left step 45 and the lateral portions of the left rear steps 46, 47.

[0115] The upper surface of the horizontal step 48 is disposed at the same height as the upper surfaces of the rear steps 46, 47 (main bodies 46a, 47a) and the upper ends of the wall portions 44h, 45h, 44i, 45i of the right step 44 and the left step 45. The upper end of the wall portion 48d of the horizontal step 48 and the upper end of the wall portion 47i of the rear step 47 are disposed at the same height.

[0116] (Configuration of the seating area) As shown in Figures 3, 4, 14 and 15, a seat portion 87 is provided. The seat portion 87 is formed by bending a pipe material, and has a rod-shaped horizontal portion 87a that extends in the left-right direction, a rod-shaped right leg portion 87b that extends downward from the right part of the horizontal portion 87a, a rod-shaped left leg portion 87c that extends downward from the left part of the horizontal portion 87a, an angle-shaped mounting bracket 87d that is connected to the lower ends of the right leg portion 87b and the left leg portion 87c, and a boss portion 87e that is connected to the mounting bracket 87d.

[0117] As shown in Figures 4 and 14, the right leg 87b of the seat 87 is bent so that the lower part of the right leg 87b of the seat 87 is positioned closer to the left-right center of the step 43 than the right part of the horizontal portion 87a of the seat 87.

[0118] The left leg 87c of the seat 87 is bent so that the lower part of the left leg 87c of the seat 87 is located closer to the left-right center of the step 43 than the left part of the horizontal part 87a of the seat 87. As a result, the horizontal width W1 of the horizontal part 87a of the seat 87 is larger than the horizontal width W2 of the lower parts of the right leg 87b and the left leg 87c of the seat 87.

[0119] (Support structure for seating) As shown in Figures 3, 14, and 15, right and left mounting brackets 71b are attached to the horizontal frame 71 of the front step frame 67 (see the above (Configuration of the front step frame supporting the right and left steps) and Figure 6), and the mounting brackets 71b are located below the openings 44e, 45e of the right step 44 and left step 45.

[0120] The right mounting bracket 87d (the lower part of the right leg 87b) of the seat portion 87 is placed on the crosspiece portion 44f of the right step 44, and the right boss portion 87e of the seat portion 87 is inserted into the opening 44e of the right step 44 and placed on the right mounting bracket 71b of the horizontal frame 71 (front step frame 67).

[0121] The left mounting bracket 87d (the lower part of the left leg 87c) of the seat portion 87 is placed on the crosspiece portion 45f of the left step 45, and the left boss portion 87e of the seat portion 87 is inserted into the opening 45e of the left step 45 and placed on the left mounting bracket 71b of the horizontal frame 71 (front step frame 67).

[0122] A bolt 88 is inserted into a boss portion 87e of the seat portion 87, and the seat portion 87 is attached to the mounting bracket 71b of the horizontal frame 71 (front step frame 67). As a result, the bolt 88 is positioned vertically between adjacent crosspieces 44f, 45f in the openings 44e, 45e of the right step 44 and the left step 45, and is attached between the mounting bracket 87d of the seat portion 87 (the lower part of the right leg portion 87b and the left leg portion 87c) and the mounting bracket 71b of the horizontal frame 71 (front step frame 67).

[0123] When the bolt 88 is tightened, the crosspieces 44f, 45f of the right step 44 and the left step 45 are sandwiched between the mounting bracket 87d of the seat portion 87 and the mounting bracket 71b of the horizontal frame 71 (front step frame 67), and the right leg 87b and left leg 87c of the seat portion 87 are attached to the step 43 (right step 44 and left step 45).

[0124] (Position of the seat) As shown in Figures 1 to 4, in side view and plan view, the seating portion 87 is provided along the left-right direction on the step 43 (right step 44 and left step 45) so as to be located behind the driver's seat 60, between the driver's seat 60 and the rear end of the step 43 (rear step 47).

[0125] When viewed from above and from behind, the right end of the seat portion 87 (horizontal portion 87a) is located closer to the left-right center of the step 43 than the right end of the step 43 (right horizontal step 48), and is located closer to the left-right center of the step 43 than the right end of the right step 44 (wall portion 44h).

[0126] When viewed from above and from behind, the left end of the seat portion 87 (horizontal portion 87a) is located closer to the left-right center of the step 43 than the left end of the step 43 (left horizontal step 48), and is located closer to the left-right center of the step 43 than the left end of the left step 45 (wall portion 45h).

[0127] In rear view, the lower part (mounting bracket 87d) of the right leg 87b of the seat 87 is attached to the step 43 (right step 44) closer to the left-right center of the step 43 than the right part of the lateral part 87a of the seat 87.

[0128] In rear view, the lower part (mounting bracket 87d) of the left leg 87c of the seat 87 is attached to the step 43 (left step 45) closer to the left and right center of the step 43 than the left part of the lateral part 87a of the seat 87.

[0129] In a rear view, the width W1 of the side portion 87a of the seat 87 and the width W2 of the lower portions of the right leg portion 87b and the left leg portion 87c of the seat 87 are larger than the width W3 of the driver's seat. The right portion and the right leg portion 87b of the side portion 87a of the seat 87 are located laterally outward to the right of the driver's seat 60, and the left portion and the left leg portion 87c of the side portion 87a of the seat 87 are located laterally outward to the left of the driver's seat 60.

[0130] (Configuration of the upper and lower frames provided around the step) 1 to 4, a lower frame 89 is attached across the lower rear parts of the right and left handrail frames 86. The lower frame 89 is formed by bending a pipe member, and has a horizontal portion 89a, right portions 89b and left portions 89c, and mounting brackets 89d which are height adjustment portions connected to the ends of the right portions 89b and left portions 89c.

[0131] The lateral portion 89a of the lower frame 89 is provided along the left-right direction near the upper part of the rear portion of the step 43 (wall portion 47i of the rear step 47). The right portion 89b and the left portion 89c of the lower frame 89 are provided along the front-rear direction near the upper part of the right and left lateral portions (lateral step 48) of the step 43. The mounting bracket 89d of the lower frame 89 is attached to the lower part of the rear portions of the right and left handrail frames 86 with bolts.

[0132] The upper frame 90 is attached across the upper part of the rear of the right and left handrail frames 86. The upper frame 90 is formed by bending a pipe member, and has a horizontal portion 90a, a right portion 90b and a left portion 90c, and a mounting bracket 90d which is a height adjustment portion connected to the ends of the right portion 90b and the left portion 90c.

[0133] The horizontal portion 90a of the upper frame 90 is provided at a position spaced a predetermined distance above the horizontal portion 89a of the lower frame 89, and extends in the left-right direction along the horizontal portion 89a of the lower frame 89.

[0134] The right portion 90b and the left portion 90c of the upper frame 90 are disposed in the front-to-rear direction along the right portion 89b and the left portion 89c of the lower frame 89 at a position spaced a predetermined distance above the right portion 89b and the left portion 89c of the lower frame 89.

[0135] The mounting brackets 90d of the upper frame 90 are attached by bolts to the upper portions of the rear parts of the right and left handrail frames 86. A plurality of frames 91 are connected across the upper frame 90 and the lower frame 89.

[0136] In side and plan views, the upper rear portion (lateral portion 90a) of the step 43 on the upper frame 90 is disposed rearward of the upper rear portion (lateral portion 89a) of the step 43 on the lower frame 89.

[0137] The right and left handrail frames 86 are provided at the right and left end positions of the step 43 (right and left lateral steps 48) in front of the upper frame 90 and the lower frame 89. The upper frame 90 is provided at a position lower than the upper end of the handrail frame 86.

[0138] A number of openings (not shown) for attaching bolts are provided along the vertical direction in the handrail frame 86. By changing the attachment positions of the mounting brackets 90d, 89d of the upper frame 90 and the lower frame 89 up or down using the openings in the handrail frame 86, the attachment position of the handrail frame 86 on the upper frame 90 and the lower frame 89 can be changed up or down.

[0139] (Bonnet configuration) 23 and 24, right and left lights 92, a front grille 93 formed in a lattice shape, and a center mascot 94 (see FIGS. 1 and 2) are provided in the front part of the bonnet 58. A right side panel 95 is provided on the right side surface of the bonnet 58, and a left side panel 96 is provided on the left side surface of the bonnet 58.

[0140] The right and left side panels 95, 96 have frame portions 95a, 96a that form the outer periphery, and frame portions 95b, 96b that are connected in the front-to-rear direction across the front and rear of frame portions 95a, 96a, and lattice-shaped frame portions 95c, 96c are provided between frame portions 95a, 96a and frame portions 95b, 96b.

[0141] A right opening 95d having an elongated hexagonal shape is formed along the front-to-rear direction between the frame portions 95c of the right side panel 95. A plurality of left openings 96d having an elongated hexagonal shape are formed along the front-to-rear direction between the frame portions 96c of the left side panel 96.

[0142] (Right and left side panel opening configuration) As shown in Figures 25 and 26, the frame portion 95c (opening 95d) of the right side panel 95 has a predetermined left-right width along the left-right direction, and the cross-sectional shape of the frame portion 95c of the right side panel 95 is rectangular.

[0143] The outer edge 95e and the inner edge 95f of the opening 95d of the right side panel 95 have the same elongated hexagonal shape, and the area of ​​the elongated hexagonal shape of the edges 95e, 95f of the right side panel 95 becomes the cross-sectional area for air to pass through the opening 95d of the right side panel 95.

[0144] A frame portion 96c (opening 96d) of the left side panel 96 has a predetermined width along the left-right direction, and the cross-sectional shape of the frame portion 96c of the left side panel 96 is V-shaped.

[0145] A front-to-rear width WL11 of an outer edge 96e of the left side panel 96 is larger than a front-to-rear width WL12 of an inner edge 96f of the left side panel 96. A vertical width WL21 of the outer edge 96e of the left side panel 96 is larger than a vertical width WL22 of the inner edge 96f of the left side panel 96.

[0146] The opening 96d of the left side panel 96 is formed to spread outward in a cross-sectional view so that the front-to-rear width WL11 and the vertical width WL21 of the portion of the opening 96d of the left side panel 96 on the exterior side of the bonnet 58 are larger than the front-to-rear width WL12 and the vertical width WL22 of the portion of the opening 96d of the left side panel 96 on the interior side of the bonnet 58.

[0147] As a result, the elongated hexagonal shape of the outer edge 96e of the opening 96d of the left side panel 96 is larger than the elongated hexagonal shape of the inner edge 96f of the opening 96d of the left side panel 96.

[0148] As a result, at the opening 96d of the left side panel 96, the cross-sectional area of ​​air passing through the inner portion of the bonnet 58 at the opening 96d of the left side panel 96 is set to be different from the cross-sectional area of ​​air passing through the outer portion of the bonnet 58 at the opening 96d of the left side panel 96.

[0149] 25 and 26, at the openings 95d, 96d of the right and left side panels 95, 96, the front-to-back width WR1 of the edge portions 95e, 95f of the right side panel 95 is the same as the front-to-back width WL11 of the outer edge portion 96e of the left side panel 96. The top-to-bottom width WR2 of the edge portions 95e, 95f of the right side panel 95 is the same as the top-to-bottom width WL21 of the outer edge portion 96e of the left side panel 96.

[0150] A front-to-rear width WR1 of the edges 95e, 95f of the right side panel 95 is larger than a front-to-rear width WL12 of the inner edge 96f of the left side panel 96. A top-to-bottom width WR2 of the edges 95e, 95f of the right side panel 95 is larger than a top-to-bottom width WL22 of the inner edge 96f of the left side panel 96.

[0151] The area of ​​the elongated hexagonal shape of the edges 95e, 95f of the right side panel 95 (the cross-sectional area of ​​air passing through the opening 95d of the right side panel 95) is the same as the area of ​​the elongated hexagonal shape of the outer edge 96e of the left side panel 96 (the cross-sectional area of ​​air passing through the portion of the opening 96d of the left side panel 96 on the exterior side of the bonnet 58).

[0152] The area of ​​the elongated hexagonal shape of the edges 95e, 95f of the right side panel 95 (the cross-sectional area of ​​air passing through the opening 95d of the right side panel 95) is larger than the area of ​​the elongated hexagonal shape of the inner edge 96f of the left side panel 96 (the cross-sectional area of ​​air passing through the portion of the opening 96d of the left side panel 96 on the inside side of the bonnet 58). As a result, the cross-sectional area of ​​air passing through the opening 95d of the right side panel 95 is set to be larger than the smaller cross-sectional area of ​​air passing through the opening 96d of the left side panel 96.

[0153] In this case, the opening 96d of the left side panel 96 is the opening 95d of the right side panel 95 and the opening 96d of the left side panel 96. On the other hand The opening 95d of the right side panel 95 is the opening 95d of the right side panel 95 and the opening 96d of the left side panel 95. on the other hand This forms an opening 95d.

[0154] (Configuration near the left side of the engine) 27 and 28, the engine 49 is supported laterally on the support frame 42 (see (Overall configuration of the riding rice transplanter) and FIG. 5 above) inside the bonnet 58. The output shaft 49a of the engine 49 protrudes leftward from the left part of the engine 49, and the output pulley 78 and the flywheel 97 are attached to the output shaft 49a of the engine 49.

[0155] As a result, in a plan view, the output shaft 49a, output pulley 78 and flywheel 97 of the engine 49 face the left side panel 96 of the bonnet 58 and are provided in a portion of the engine 49 facing one opening 96d.

[0156] A hydrostatic continuously variable transmission 98 is connected to the left side surface of the transmission case 25, and a transmission belt 99 is attached between the output pulley 78 and an input pulley 98a of the continuously variable transmission 98.

[0157] A support stay 103 connected to the left front portion of the engine 49 extends leftward and enters below the right floor frame 50 (see the above-mentioned (Configuration of the floor frame that supports the floor) and FIG. 5). A support stay 104 connected to the left rear portion of the engine 49 extends leftward and enters below the right floor frame 50 while straddling above the transmission belt 99.

[0158] A muffler 105 is disposed along the front-rear direction below the right floor frame 50, with a front portion of the muffler 105 supported by a support stay 103 and a rear portion of the muffler 105 supported by a support stay 104. An exhaust pipe 106 extending from the front portion of the engine 49 is connected to the front portion of the muffler 105.

[0159] The power of the engine 49 is transmitted to the continuously variable transmission 98 via the output shaft 49a of the engine 49, the output pulley 78 and the transmission belt 99, and the power of the continuously variable transmission 98 is transmitted to a sub-transmission device (not shown) inside the transmission case 25.

[0160] The power of the auxiliary transmission device is transmitted to the front wheels 1 via a transmission system (not shown) inside the front axle case 26 (see the above-mentioned (Support structure of the front and rear wheels) and FIG. 5), and is transmitted to the rear wheels 2 via a transmission shaft (not shown) from the transmission case 25 to the rear axle case 27 (see the above-mentioned (Support structure of the front and rear wheels) and FIG. 7), and via another transmission system (not shown) inside the rear axle case 27. The power branched off between the continuously variable transmission 98 and the sub-transmission is transmitted from the transmission case 25 to the seedling planting device 5 (see the above-mentioned (Configuration of the seedling planting device and spare seedling tray) and Figures 1 and 2) via a transmission shaft (not shown).

[0161] (Configuration near the right side of the engine) As shown in Fig. 28, inside the bonnet 58, a fan 100 that is driven to rotate by the power of the engine 49 is provided to the right of the engine 49. A radiator 101 is disposed along the front-rear direction and supported on the right side of the support frame 42 (see (Overall configuration of the riding rice transplanter) described above and Fig. 5), and a mesh member 102 that is a dustproof member is attached to the right side of the radiator 101.

[0162] As a result, the fan 100 and the radiator 101 are provided inside the bonnet 58 between the right side panel 95 of the bonnet 58 (the other opening 95d of the bonnet 58) and the engine 49 in a plan view. In plan view, the fan 100 is provided between the radiator 101 and the engine 49, and the mesh member 102 is provided on the radiator 101 at a portion facing the other opening 95d of the bonnet 58.

[0163] When the fan 100 is driven to rotate, an air flow from right to left is generated inside the bonnet 58, and the air outside the bonnet 58 flows into the inside of the bonnet 58 through an opening 95d of a right side panel 95 of the bonnet 58 (see the above-mentioned (Configuration of the openings of the right and left side panels) and Figures 23 and 25) as air for cooling the engine 49. It will be introduced.

[0164] Air introduced into the inside of the bonnet 58 from the opening 95d in the right side panel 95 of the bonnet 58 passes through the mesh member 102, the radiator 101, and the fan 100, flows around the engine 49, and exits to the outside of the bonnet 58 through the opening 96d in the left side panel 96 of the bonnet 58 (see the above-mentioned (Configuration of the openings in the right and left side panels) and Figures 24 and 25).

[0165] (First Alternative Embodiment of the Invention) 1 to 28 show a riding rice transplanter not equipped with a fertilizer applicator 107. The following describes how to obtain a riding rice transplanter equipped with a fertilizer applicator 107, which is an agricultural material supply device, among the riding rice transplanters shown in FIGS. 1 to 28.

[0166] (Installation area for installing a fertilizer application device in the first alternative embodiment of the invention) 3, 4 and 6, the seat portion 87, the rear steps 46, 47 and the rear step frame 68 are removed. The walls 44i, 45i of the right step 44 and the left step 45 shown in Figs. 11 and 12 are cut away, and the right step 44 and the left step 45 are used.

[0167] In Figures 3 and 6, since the rear steps 46, 47 and the rear step frame 68 are not provided, the area where the rear steps 46, 47 and the rear step frame 68 were provided becomes the installation area for installing the fertilizer application device 107, and the installation area for installing the fertilizer application device 107 is formed rearward of the right step 44, the left step 45, and the front step frame 67, and is formed between the rear parts of the right and left lateral steps 48.

[0168] (Configuration of the Fertilizer Applicator in the First Alternative Embodiment of the Invention) As shown in Figs. 29 to 32, the fertilizer application device 107 has a hopper 108, a plurality of delivery units 109, an air blowing unit 110, a transport air duct 111, a discharge duct 112, and the like.

[0169] As shown in Figure 30, a support frame 114 is provided along the left-right direction, and right and left support frames 113 are connected to the support frame 114 and extend downward. The lower part of the support frame 113 is bolted to the rear of the horizontal frame 18 (see the above-mentioned (Configuration of the aircraft frame) and Figure 6).

[0170] 29, 30, and 31, the right and left support frames 115 are connected to the lower part of the rear of the handrail frame 86, and the support frame 116 along the left-right direction is connected across the right and left support frames 115. The extension part 109 is connected to the support frames 114, 116 so as to be sandwiched between the support frames 114, 116 from the front and rear.

[0171] A hopper 108 that stores fertilizer, an agricultural material, is attached across the tops of multiple delivery units 109, which are connected to the bottom of the hopper 108. A furrow former (not shown) is attached to the float 9 (see the above-mentioned (Configuration of the seedling planting device and spare seedling tray) and Figures 1 and 2), and a hose (not shown) is connected between the delivery units 109 and the furrow former.

[0172] Blower unit 110 is attached to the left side of support frame 114. Blower unit 110 has a blower case 110a attached to the left side of support frame 114, a blower blade (not shown) housed in blower case 110a so as to be rotatable about an axis along the up-down direction, and an electric motor 110b that rotates and drives the blower blade.

[0173] 29, 30, and 32, a cylindrical transport air duct 111 is disposed along the left-right direction and is connected along the left-right direction across the front parts of the lower portions of the plurality of payout units 109. An air blowing switching unit 119 is connected to the left part of the transport air duct 111, and an air blowing case 110a of the air blowing unit 110 is connected to the air blowing switching unit 119.

[0174] A cylindrical exhaust duct 112 is disposed in front of the transport air duct 111 at the same height as the transport air duct 111 along the left-right direction and is connected along the left-right direction across the front parts of the plurality of payout units 109, with the left part of the exhaust duct 112 connected to the air blowing switching unit 119. A cover 120 for protecting the transport air duct 111 and the exhaust duct 112 is provided above the exhaust duct 112 along the left-right direction over substantially the entire length of the exhaust duct 112.

[0175] (Configuration of the intake duct in the first alternative embodiment of the invention) As shown in FIGS. 29, 39 and 31, the intake duct 117 extends downward from the lower part of the blower case 110a of the blower section 110, and extends forward toward the engine 49 below the upper surface 45a of the left step 45.

[0176] A support stay 118 is attached to the frame 73 of the front step frame 67 (see the above (Configuration of the front step frame supporting the right and left steps) and Figure 6). An intake duct 117 is supported by the support stay 118 and is disposed below the lower part 86b of the left handrail frame 86.

[0177] (Operation state of the fertilizer application device in the first alternative embodiment of the invention) As shown in Figures 29 to 32, when the blower blades in blower section 110 are rotationally driven by electric motor 110b, relatively high temperature air near engine 49 is drawn into suction duct 117 and guided to blower section 110 via suction duct 117.

[0178] The air guided to the blower section 110 causes the blower section 110 to generate a conveying air, which is then supplied from the blower switching section 119 to the conveying air duct 111 , and the conveying air is then supplied from the conveying air duct 111 to the payout section 109 .

[0179] A fertilizer discharge port (not shown) from the delivery section 109 to the discharge duct 112 is closed, and the air blowing switching section 119 is set to a state in which the conveying air from the air blowing section 110 is supplied to the conveying air duct 111 .

[0180] In the above-mentioned state, the fertilizer in the hopper 108 is fed into the feeding section 109 by the feeding section 109, and the fertilizer inside the feeding section 109 is supplied through the hose to the furrow former (see the above-mentioned (Configuration of the fertilizer application device in the first alternative embodiment of the invention)) by the conveying air supplied to the feeding section 109 from the conveying air duct 111. As the riding rice transplanter moves forward, furrows are formed on the surface of the rice field by the furrow former, and the fertilizer supplied to the furrow former is supplied to the furrows on the surface of the rice field.

[0181] When work is completed and the fertilizer remaining in the hopper 108 is to be collected, the fertilizer discharge outlet (not shown) from the delivery section 109 to the discharge duct 112 is opened and the air blowing switching section 119 is set to a state in which the conveying air from the air blowing section 110 is supplied to the discharge duct 112. In the above-mentioned state, the fertilizer remaining in the hopper 108 is supplied to the discharge duct 112 and transported to the outlet on the right side of the discharge duct 112 by the conveying air supplied to the discharge duct 112, and the fertilizer exiting from the outlet of the discharge duct 112 is collected in a collection bag (not shown).

[0182] (Arrangement of the fertilizer application device in the first alternative embodiment of the invention) As shown in Figures 29 to 32, fertilizer application device 107 (hopper 108, delivery section 109, air blowing section 110, conveying air duct 111, exhaust duct 112 and air blowing switching section 119) are arranged in an installation area for installing fertilizer application device 107 (see the above-mentioned (installation area for installing the fertilizer application device in the first alternative embodiment of the invention)). The fertilizer application device 107 is disposed along the left-right direction on the rear side relative to the rear parts of the steps 43 (the right step 44 and the left step 45) in plan and side views.

[0183] The fertilizer application device 107 is disposed between the rear part of the right lateral step 48 and the rear part of the left lateral step 48 in plan view and rear view. The rear portion of a right lateral step 48 , which is the right portion of the step 43 , extends rearward so as to be positioned laterally outward relative to the right portion of the fertilizer application device 107 . The rear portion of the left lateral step 48, which is the left portion of the step 43, extends rearward so as to be positioned laterally outward relative to the left portion of the fertilizer application device 107.

[0184] The upper surfaces 44a, 45a of the right step 44 and the left step 45, the exhaust duct 112, the carrying air duct 111, the air blower case 110a of the air blower 110, and the air blower switching unit 119 are disposed at the same height.

[0185] In front view, the upper surface portions 44a, 45a of the right step 44 and the left step 45, the exhaust duct 112, and the transport air duct 111 overlap over the entire length of the transport air duct 111 and the entire length of the exhaust duct 112. In front view, the upper surface portion 45a of the left step 45 overlaps with the blower case 110a of the blower section 110 and the blower switching section 119.

[0186] As a result, the fertilizer applicator 107 is provided at a relatively low position in the riding rice transplanter. In a working state (when the front wheels 1 and rear wheels 2 are in contact with the tillage pan and the float 9 of the seedling planting device 5 is in contact with the rice field surface), if an imaginary line (not shown) is imagined extending obliquely upward and forward from the seedling platform 10 along the seedling platform 10 in a side view, the upper end of the fertilizer applicator 107 (hopper 108) is located below the imaginary line.

[0187] Instead of the fertilizer application device 107, a chemical supplying device having a hopper (not shown) for storing the agricultural material, a plurality of delivery sections (not shown), a blowing section (not shown), a transport air duct (not shown), an exhaust duct (not shown), etc., and configured to supply chemicals to the rice field surface may be equipped as the agricultural material supplying device.

[0188] (Second Alternative Embodiment of the Invention) In the fertilizer application device 107, the air blowing section 110 and the air blowing switching section 119 may be configured to be connected to the right parts of the conveying air duct 111 and the exhaust duct 112, and the suction duct 117 may be configured to extend downward from the lower part of the air blowing case 110a of the air blowing section 110 and extend forward toward the engine 49 from the lower side relative to the upper surface portion 44a of the right step 44. The intake duct 117 may be configured to be disposed above the lower portion 86b of the right (left) handrail frame 86.

[0189] (Third Alternative Embodiment of the Invention) Instead of the five-link type suspension mechanism, a three-link type suspension mechanism having right and left links and a lateral rod may be adopted.

[0190] (Fourth Alternative Embodiment of the Invention) In the fuel tank 80, the front lower part of the fuel tank 80 may be attached to the horizontal frame 51 of the left floor frame 50, and the rear upper part of the fuel tank 80 may be attached to the left part of the horizontal frame 72 of the front step frame 67, so that the fuel tank 80 is configured to be provided below the left front part of the step frame 66 (front step frame 67). In this configuration, the left outermost connecting frame 79 may be configured so that its left lateral outer position relative to the fuel tank 80 is disposed along the vertical direction.

[0191] (Fifth Alternative Embodiment of the Invention) Instead of constructing the right step 44 and the left step 45 separately, the right step 44 and the left step 45 may be integrally constructed as one front step. Instead of constructing the right and left floor frames 50 separately, the right and left floor frames 50 may be connected to each other to form a single floor frame 50.

[0192] (Sixth Alternative Embodiment of the Invention) In addition to the openings 44e, 45e of the right step 44 and the left step 45, a dedicated opening for attaching the seat portion 87 may be provided in the right step 44 and the left step 45. With this configuration, the boss portion 87e of the seat portion 87 is unnecessary, so that the right step 44 and the left step 45 are sandwiched between the mounting bracket 87d of the seat portion 87 and the mounting bracket 71b of the horizontal frame 71, and the bolt 88 is tightened through the openings of the right step 44 and the left step 45 across the mounting bracket 87d of the seat portion 87 and the mounting bracket 71b of the horizontal frame 71.

[0193] (Seventh Alternative Embodiment of the Invention) In the left side panel 96, the elongated hexagonal shape of the inner edge 96f of the opening 96d of the left side panel 96 may be configured to be larger than the elongated hexagonal shape of the outer edge 96e of the opening 96d of the left side panel 96.

[0194] As a result, at the opening 96d of the left side panel 96, the cross-sectional area of ​​air passing through the inner portion of the bonnet 58 at the opening 96d of the left side panel 96 is set to be different from the cross-sectional area of ​​air passing through the outer portion of the bonnet 58 at the opening 96d of the left side panel 96.

[0195] (Eighth Alternative Embodiment of the Invention) The engine 49 may be arranged in reverse, with the output shaft 49a of the engine 49 provided on the right side of the engine 49 and the fan 100, the radiator 101 and the mesh member 102 arranged on the left side of the engine 49. According to this configuration, in the bonnet 58, the opening 95d of the right side panel 95 may be configured as shown in the right part of Fig. 5 and the lower part of Fig. 6, or may be configured as described above in (Seventh Alternative Embodiment of the Invention). The opening 96d of the left side panel 96 may be configured as shown in the left part of Fig. 5 and the upper part of Fig. 6.

[0196] (Ninth Alternative Embodiment of the Invention) The engine 49 may be configured as an air-cooled type. According to this configuration, a fan 100 for cooling the engine 49 is provided, and the radiator 101 is eliminated. The openings 95d, 86d of the right and left side panels 95, 96 may be formed not only in an elongated hexagonal shape, but also in a circular shape, a rectangular shape, an elongated oval shape, a parallelogram shape, or the like.

[0197] (Tenth Alternative Embodiment of the Invention) In a riding rice transplanter equipped with a fertilizer application device 107, the seating portion 87 may be provided as a guard member for the fertilizer application device 107, the right and left side steps 48 may be eliminated, and the upper frame 90 and lower frame 89 may be eliminated.

[0198] (Eleventh Alternative Embodiment of the Invention) An electrically operated winch (not shown) may be provided as described below. A winch frame (not shown) is attached to the front of the support frame 42 (see the above-mentioned (Overall configuration of the riding rice transplanter) and Figure 5) to extend the front position of the floor 38 upward, and the winch is attached to the top of the winch frame so that it is positioned higher than the floor 38.

[0199] If the riding rice transplanter becomes unable to travel in a deep paddy field, a wire (not shown) extended from the winch is attached to a tree or the like on the ridge, and the wire is wound up by the winch to free the riding rice transplanter. Since the winch is positioned higher than the floor 38, the winch will not be submerged.

[0200] Of the multiple mounting members that attach the winch frame to the support frame 42, one mounting member may be constructed to be slightly weaker than the other mounting members. If a large load is applied to the winch when it is used, the fragile mounting member can be broken, causing the winch frame to fall off the support frame 42, thereby preventing a state in which a large load is applied to the support frame 42. [Industrial Applicability]

[0201] The present invention can be applied not only to riding rice transplanters, but also to riding direct seeders equipped with a sowing device for sowing seeds on the surface of a rice field as a working implement. [Explanation of symbols]

[0202] 3 Aircraft frame (aircraft) 38th Floor 43 Steps 44a Top part 45a Top part 49 Engine 49a Output shaft 58 Bonnet 86 Handrail Frame 86b Lower part 95d opening 96d Opening 100 Fans 101 Radiator 102 Mesh material (dustproof material) 107 Fertilizer application equipment (agricultural material supply equipment) 108 Hopper 109 Payout section 110 Blower 110a Blower Case 110b Electric motor 111 Transport air duct 117 Intake duct WL11 Front and rear width WL21 Vertical width WL12 Front and rear width WL22 Vertical width

Claims

1. The engine is located at the front of the aircraft, a bonnet that houses the engine and has a plurality of right openings provided on a right side surface and a plurality of left openings provided on a left side surface; a fan that generates a flow of outside air along a left-right direction so that outside air for cooling the engine is introduced into the inside of the bonnet through one of the right opening and the left opening, At the other of the right opening and the left opening, a cross-sectional area of ​​the other opening through which outside air passes at an inner side of the bonnet and a cross-sectional area of ​​the other opening through which outside air passes at an outer side of the bonnet are set to be different from each other, A paddy field working machine in which the cross-sectional area through which outside air passes at one of the openings is set to be larger than the smaller cross-sectional area through which outside air passes at the other opening.

2. 2. The paddy field working machine according to claim 1, wherein a cross-sectional area through which the outside air passes at the one opening and a larger cross-sectional area through which the outside air passes at the other opening are set to be the same.

3. an output shaft of the engine is provided at a portion of the engine facing the other opening, the fan and a radiator arranged along a front-rear direction are provided inside the bonnet between the one opening and the engine, The fan is provided between the radiator and the engine, 3. The paddy field working machine according to claim 1, wherein a dustproof member is provided on a portion of the radiator facing the one opening.

4. A paddy field working machine as described in any one of claims 1 to 3, wherein the other opening is formed in an outwardly expanding shape such that, when viewed in cross section, the front-to-back width and top-to-bottom width of the portion of the other opening on the outer side of the bonnet are greater than the front-to-back width and top-to-bottom width of the portion of the other opening on the inner side of the bonnet.

5. A floor provided on the aircraft; A step provided at a rear portion of the aircraft body and positioned higher than the floor; An agricultural material supplying device is provided that is arranged on the rear side of the step along the left-right direction and is capable of supplying agricultural materials to the rice field surface, The agricultural material supplying device includes a hopper for storing agricultural materials, a delivery section connected to a lower portion of the hopper for delivering the agricultural materials from the hopper, a blowing section for generating a conveying air for conveying the agricultural materials to a rice field surface, and a conveying air duct connected in the left-right direction between the delivery section and the blowing section for supplying the conveying air from the blowing section to the delivery section, The paddy field working machine according to any one of claims 1 to 4, wherein, when viewed from the front, an upper surface of the step and the conveying air duct overlap over the entire length of the conveying air duct.

6. The air blowing unit includes an air blower case connected to the right or left part of the transport air duct, air blower blades housed in the air blower case so as to be rotatable around an axis along a vertical direction, and an electric motor that rotates and drives the air blower blades, The paddy field working machine according to claim 5, wherein an upper surface of the step and the blower case overlap each other in a front view.

7. A paddy field working machine as described in claim 5 or 6, wherein an intake duct that draws in air near the engine and guides it to the blowing section extends downward from the blowing section and extends with its lower side toward the engine relative to the step.

8. A right and left handrail frame is provided at a position laterally outside the right and left parts of the step, The paddy field working machine according to claim 7, wherein the suction duct is disposed below the lower part of the right or left handrail frame.

9. The right portion of the step extends rearward so as to be located laterally outside the right portion of the agricultural material supplying device, A paddy field working machine according to any one of claims 5 to 8, wherein a left portion of the step extends rearward so as to be positioned laterally outward of a left portion of the agricultural material supplying device.

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