JP4454294B2 - Aircraft structure of the riding rice transplanter - Google Patents

Description

  The present invention has 4 to 6 planting strips in which a seedling planting device is connected to the rear part of a four-wheel drive type traveling machine body having a steerable front wheel and a non-steerable rear wheel via a lifting link mechanism. The present invention relates to the structure of a relatively small passenger rice transplanter of about the size of a strip.

As the above-mentioned riding rice transplanter, there has been proposed one in which a support frame in which a base portion of an elevating link mechanism is connected to a rear portion of a transmission case that supports front wheels and rear wheels (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2003-16

  The proposed aircraft structure eliminates the main frame by using the mission case as a strength member of the aircraft, so the mission case is connected to the front of the main frame and the lifting link mechanism is connected to the rear of the main frame. The structure is simpler than that of medium- or large-sized passenger rice transplanters with a connecting support frame standing upright, and can be effectively used for small passenger rice transplanters. However, on the other hand, the inspection and maintenance of the mechanism built in the mission case, which is a strength member of the aircraft, is a large-scale work that separates the seedling planting device and greatly disassembles the aircraft, and it is possible to remove and inspect the mission case alone. There is a problem that the maintainability is lower than that of a model having a machine structure with a main frame that can be made.

  The present invention has been made paying attention to such points, and a main object of the present invention is to improve the maintainability of the transmission case while having a structure without a main frame.

A first invention is a riding rice transplanter in which a seedling planting device is connected to a rear portion of a four-wheel drive type traveling machine body including a steerable front wheel and a non-steerable rear wheel via a lifting link mechanism.
Constitutes a transmission case which supports the front wheels and the rear wheels on the left and right bisected structures, erected a support frame base portion of the lifting linkage to the transmission case are connected, the left and right split cases of the transmission case the supporting frame with bolted connection to the respective portion, the Ri one split case part of releasing the connection between the support frame and detachably configuration from the other split case portions tare, said support frame, said It comprises a pair of left and right frame rods connected to each of the left and right split case parts from the upper part at the connecting portion of the base part of the lifting link mechanism, and the one split case part is provided protruding from the split case part The frame rod provided with a coupling portion and coupled to the one split case portion has a front end portion of the frame rod, Wherein the state positioned inside the forming unit are connected to the connecting portion.

According to the above configuration, to release the bolt connecting the left and right divided case portion, to release the connection between one split case portion and the support frame, a mechanism that is one of the split case portion and supported thereby, The inside of the mission case can be inspected and maintained by separating the support frame from the other split case. In this case, the lifting link mechanism may remain connected to the support frame remaining in the other split case portion.

  Therefore, according to the first aspect of the invention, it is possible to improve the maintainability of the mission case while adopting the airframe structure that does not include the main frame and uses the mission case itself as a strength member.

In a second aspect based on the first invention, as well as deploy the power steering unit of the front wheels steering on the transmission case, only the other split case part not released the connection between the support frame The power steering unit is connected and supported.

  According to the above configuration, when separating one split case part of the transmission case in a power steering specification model, it is not necessary to remove the power steering unit that is connected and supported only to the other split case part that remains. This is effective in improving the maintainability of the case.

Other third invention, in the first aspect, as well as deploying the handle grayed post supporting the steering operation shaft of the front wheel steering on the transmission case, that not released the connection between the support frame The handle post is connected and supported only to the divided case portion.

  According to the above configuration, in the case of a manual steering type model, when separating one split case part of the mission case, it is not necessary to remove the handle post that is connected and supported only to the other split case part. This is effective for improving the maintainability.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the PTO shaft for driving the seedling planting device provided in the transmission case is separated from the other divided case portion where the connection with the support frame is not released. It is a projecting one.

  According to the above configuration, when one split case portion of the transmission case is separated, the remaining split case portion is equipped with the PTO shaft, so that the support frame of the other split case portion is connected to the support frame via the lifting link mechanism. Thus, the mission case can be opened while the seedling planting device is connected and the PTO shaft and the seedling planting device are connected in shaft transmission, which is effective in improving the maintenance of the mission case.

A fifth invention, in any one invention of claims 1 to 4, wherein the separate casing portion provided with a groove on at least one hand of the joint surface of, by forming the oil passage of the hydraulic system between the joint surfaces There is something.

  According to the above configuration, by using the left and right divided structure of the mission case, an oil passage can be formed without external piping, and the above effect of any one of claims 1 to 4 can be achieved, and the number of parts can be reduced. Effective for saving and cost reduction.

  FIG. 1 shows the entire side surface of the riding rice transplanter according to the present invention, and FIG. 2 shows the entire plane. This rice transplanter has a parallel quadruple link structure that is driven by a hydraulic cylinder 4 at the rear of a four-wheel drive type traveling machine body 3 having a front wheel 1 that can be steered and a rear wheel 2 that cannot be steered. A seedling planting device 6 is connected via a mechanism 5, and a fertilizer device 8 is provided at a rear portion of a driver seat 7 provided at a rear portion of the traveling machine body 3, and an engine bonnet 9 is disposed at a front portion of the traveling machine body 3. A front panel 10, a steering handle 11, and the like are provided. Further, a reserve seedling base 12 is vertically installed on the left and right sides of the engine bonnet 9.

  The seedling planting device 6 is configured in a four-row planting specification, and seedlings are placed on the seedling stage 15 on which the seedlings are placed and reciprocated horizontally by a fixed stroke. It comprises four sets of rotary planting mechanisms 16 planted on the surface, three leveling floats 17 for leveling the planting location on the surface, and the like.

  The fertilizer applicator 8 feeds the powdered fertilizer stored in the fertilizer hopper 18 by a set amount by a feeding mechanism 19 provided at the lower end of the hopper, and supplies the fed fertilizer by four conveying air from the electric blower 20. It is sent out to the hose 21, transported by wind to the four groovers 22 attached to the leveling float 17, and fertilizer is fed into the fertilizer grooves formed on the surface near the side of the planted seedling by the groovers 22. It is configured to be buried.

A mission case 25 is provided at the front of the traveling machine body 3, and a rotating case 26 that pivotally supports the front wheel 1 at the end of a front axle case 25 a that projects laterally from the front left and right of the mission case 25. Is installed to be capable of steering and turning around the vertical center P, and a pair of left and right swing cases 28 elastically supported by a suspension mechanism 27 are swingable up and down around a fulcrum a at the rear of the mission case 21. The left and right rear wheels 2 are pivotally supported at the rear ends of the left and right swing cases 28, and the engine 29 housed in the engine bonnet 9 is further projected forward from the transmission case 25. that is equipped to.

  As the engine 29, a horizontal shaft type air-cooled gasoline engine having an output shaft 31 projecting leftward is used, and a cylinder portion 29b connected to an upper portion of the crankcase 29a is inclined to be rearward and low in volume. The lower end of the front end of the crankcase 29a and the cylinder portion 29b are mounted on the front frame 30 in a vibration-proof state via a vibration-proof rubber 32.

  In addition, a fuel tank 32 is provided in the upper part of the engine bonnet 9, and an auxiliary lever 33 is used at the front end of the front frame 30 that is used when the driver moves on a slope where the driver descends to the ground and steers. In this way, it is mounted so that it can swing back and forth around the lower fulcrum b within a certain range from the stowed posture stood substantially vertically and the action posture swung forward. When the self-propelled vehicle is tilted back and forth as in the case of the unloading, the front lever of the fuselage is prevented from being lifted by the driver who descends to the ground pushing the auxiliary lever 33 swinging out to the action posture.

  The mission case 25 functions as a strength member that constitutes the traveling airframe, and has a left and right split structure with the center of the left and right sides of the airframe as a dividing line, and is configured by connecting the left and right split case portions 25L and 25R with bolts. Has been.

The rear portion of the mission case 25 supporting frame 34 is erected, to the support frame 34, the constituting an elevating link mechanism 5 upper link 5a and the proximal end portion of the lower link 5b and the proximal end of the hydraulic cylinder 4 Are pivotally connected, and the driver's seat 7, the rear fender 14, the battery, and various levers around the seat are supported.

The support frame 34 includes a pair of left and right vertical frame portions 34a, a horizontal frame 34b extending across the vertical frame portions 34a, a connecting frame 34c extending forward from the lower end of the vertical frame portion 34a, and both vertical frames. It is composed of a pair of left and right diagonal frame rods 34d and 34e extending diagonally forward and downward from the upper and lower intermediate portions of the portion 34a. The front ends of the diagonal frame rods 34d and 34e are bolted to the transmission case 25 while being tightened.

Here, as shown in FIGS. 14, 15, and 16, a bolt insertion hole 75 is formed in the front end portion of the right diagonal frame rod 34e, and the right outer side of the right divided case portion 25R in the mission case 25 is formed. In contrast to being fastened by a bolt 76 screwed into the side, as shown in FIGS. 13, 15, and 16, a nut 77 is welded and fixed to the front end portion of the left oblique frame rod 34d. The front end portion of the diagonal frame rod 34d on the left side is positioned by positioning the front end portion of the diagonal frame rod 34d inside the connecting portion 78 projecting from the divided case portion 25L and screwing the bolt 79 inserted from the outside into the nut 77. Are connected to the left split case portion 25L.

  FIG. 6 shows an outline of the transmission structure in this rice transplanter.

  A hydraulic continuously variable transmission (HST) 35 is connected to the left side surface of the transmission case 25 as a main transmission, and an output shaft 31 of the engine 29 and an input shaft (pump shaft) 36 of the continuously variable transmission 35 are connected. Are coupled with each other via a belt 37, and the shift output taken out from the output shaft (motor shaft) 38 of the continuously variable transmission 27 is transmitted to the input shaft 39 of the mission case 25, and this power is transmitted to the second gear. After being transmitted to the shaft 40, it is branched into a traveling system and a planting system and transmitted as follows.

  [Running transmission system]

  The transmission case 25 is equipped with a differential device 41 for the front wheel 1, and a wheel drive transmission shaft 42 extending from the differential device 41 to the left and right so as to be differentially driven is a front axle case of the transmission case 25. An insertion support is provided at 25a. The input cylinder shaft 43 of the differential device 41 is loosely fitted to one (right side in this example) of the transmission shaft 42, and the input cylinder shaft 43 and the second shaft 40 serve as the auxiliary gear transmission 44 for traveling. By shifting the shift gear 45, which is interlocked and connected to the input cylinder shaft 43, to the left and right, and selectively engaging the large and small gears 45a and 45b with the gears 46a and 46b provided on the second shaft 40, The traveling system power shifted in two stages is transmitted to the input cylinder shaft 43.

  A vertical transmission shaft 47 is inserted and supported along the vertical axis P in the rotation case 26 that is rotatably mounted around the vertical axis P at the outer ends of the left and right axle cases. The upper end of the transmission shaft 47 and the transmission shaft 42 are interlocked and connected via a bevel gear transmission mechanism 48, and the front axle 49 supported on the lower part of the rotating case 26 and the lower end of the vertical transmission shaft 47 are connected to the bevel gear reduction transmission mechanism. 50 are linked together.

  A rear axle case 25b is integrally projected on the left and right of the rear end portion of the transmission case 25, and a pair of left and right lateral transmission shafts 51 arranged concentrically with the fulcrum a of the swing case 28 abut against the rear axle case 25b. The chain 54 is wound over the output sprocket 52 that is inserted and supported in a state and is fixed to the input cylinder shaft 43 of the differential device 41, and the input sprocket 53 that is loosely fitted to the abutting ends of the both lateral transmission shafts 51. While being rotated, the input sprocket 53 and the left and right lateral transmission shafts 51 are connected to each other via the side clutch 55.

  The swing case 28 is loosely fitted in a rear-side cantilever manner so as to be pivotable up and down at the outer end portion of the rear axle case 25b, and the front end portion of the front-rear transmission shaft 56 inserted through the swing case 28 and the lateral transmission shaft 51, Are coupled to each other via a bevel gear transmission mechanism 57, and the rear axle 58 provided at the rear end of the swing case 28 and the rear end of the front-rear transmission shaft 56 are coupled to each other via a bevel gear reduction transmission mechanism 59. Thus, the left and right rear wheels 2 are driven in synchronism with the front wheels 1 and can be moved up and down independently.

  The side clutch 55 is configured as a multi-plate friction clutch. A clutch drum 61 on the driving side is fixed to the left and right side surfaces of the input sprocket 53, and a clutch boss 62 on the side of the lateral transmission shaft 51 is provided. A plurality of friction plates 63 that are splined and engaged and supported by the clutch drum 61 and a plurality of friction plates 64 that are engaged and supported by the clutch boss 62 are alternately overlapped and arranged by a spring 65 with the clutch boss 62 incorporated therein. By urging and shifting the laterally outward force, the friction plates 63 and 64 are pressed against each other to bring about a “clutch engaged” state in which power is transmitted from the clutch drum 61 to the clutch boss 62. Is moved backward against the spring 65 to release the pressure contact between the friction plates 63 and 64, so that the clutch boss 6 Cut off the power transmission "clutch disengaging" state is adapted to be brought to.

  The rear axle case 25b is fitted with a clutch operating shaft 66, and the clutch operating shaft 66 is rotated to displace an eccentric pin 66a formed on the inner end thereof in the axial direction so that the clutch boss 62 is connected. This operation is to be performed.

  A brake 68 acting on the clutch drum 61 in one (left side in this example) side clutch 55 is provided. The brake 68 includes a ring-shaped friction plate 69 that is fitted on the clutch drum 61 and engaged with the engagement groove of the side clutch friction plate 63, and a ring that is non-rotatably engaged with the inner surface of the transmission case 25. And an operating arm 71a connected to the brake operation shaft 71 by rotating a brake operation shaft 71 penetratingly attached to the transmission case 25. Thus, the clutch drum 61 and the input sprocket 53 integrated therewith are braked by pressing the friction plates 69 and 70 together.

  The brake operation shaft 71 is linked to a brake pedal 72 arranged on the right front side of the driving step 13, and the input sprocket 53 is braked by depressing the brake pedal 72. The rear wheel 2 and the left and right front wheels 1 can be braked simultaneously. Although a detailed structure is not shown, a tension type main clutch 73 and a brake pedal 72 acting on a belt 37 that interlocks and connects the engine 29 and the continuously variable transmission 35 are linked to each other, and the brake pedal 72 is depressed. As a result, the airframe stops and the main clutch 73 is disengaged, and the transmission of engine power to the continuously variable transmission 35 is cut off.

  Further, a brake operation lever 74 is integrally fixed to the brake pedal 72 and extends toward the front of the aircraft. When the driver descends to the ground and steers, the brake operation lever 74 is pushed down to depress the brake operation lever 74 from the ground. A stop operation can be performed.

  [Planting transmission system]

  A third shaft 81 is loosely fitted concentrically with the input shaft 39 of the transmission case 25, and the third shaft 81 and the second shaft 40 are interlocked and connected by a stock transmission 82 that performs three-speed shifting. ing. Then, after the power extracted from the third shaft 81 is converted into power in the front-rear direction via the gear pairs 83 and 84 outside the case and the bevel gear transmission mechanism 85, the PTO shaft is transmitted via the torque limiter 86 and the planting clutch 87. 88 to be transmitted. The PTO shaft 88 is provided so as to protrude rearward from the upper portion of the mission case 25, and the power of the planting system taken out from the PTO shaft 88 moves up and down via a shaft transmission mechanism 89 that can be expanded and contracted. Is transmitted to the seedling planting device 6.

  In addition, it is possible to change the stocks which can be selected in three steps by the stock transmission 82 by changing or exchanging the gear pairs 83 and 84 arranged outside the case.

  The PTO shaft 88 is offset to the right with respect to the left and right center of the machine body and protrudes from the right split case portion 25R, and its extended end is provided at the rear end of the right split case portion 25R. It is supported by a bearing bracket 80.

  Further, an intermediate PTO shaft 91 is horizontally mounted near the rear portion of the transmission case 25, and a sprocket 92 loosely fitted to the intermediate PTO shaft 91 is attached to an intermediate portion of the chain 54 provided in the transmission system to the rear wheel 2. Bite. Further, a clutch boss 93 that can be engaged and disengaged from the side is splined to the intermediate PTO shaft 91 so as to be shiftable. The intermediate PTO shaft 91 is engaged with the sprocket 92 by shifting the clutch boss 93 by a spring 94. The power synchronized with the traveling speed can be taken out from the shaft 91, and the clutch boss 93 can be reversely shifted against the spring 94 and detached from the sprocket 92 so that the power can be taken out. It has become. The case outer end of the intermediate PTO shaft 91 and the feeding mechanism 19 in the fertilizer application device 8 are interlocked and connected by a crank transmission mechanism (not shown). In this way, by driving the feeding mechanism 19 at a predetermined ratio with respect to the traveling speed, the fertilizer feeding amount per unit traveling distance (unit area) is always set to the set value (with the feeding mechanism) even if the strain is changed by inter-shaft shifting. Can be maintained). Note that the intermediate PTO shaft 91 can be omitted in a model having a specification that does not include the fertilizer application device 8.

  Next, a steering structure for steering the front wheel 1 will be described.

  A knuckle arm 101 is attached to the left and right rotating cases 26 that pivotally support the front wheel 1, and the left and right knuckle arms 101 are linked to a rack and pinion type steering mechanism 102. The steering mechanism 102 is disposed in a corner portion of the lower end of the front end of the transmission case 25 in parallel with the transmission shaft 42 for driving the front wheels. The pinion gear 104 meshes with a rack portion 103a formed on the rear surface of the rack cage 103. Then, both end portions of the rack cage 103 protruding from the left and right from the mission case 25 and the left and right knuckle arms 101 are interlocked and connected by a ball joint 105 and a connecting rod 106. In addition, bellows-like stretchable boots 107 are mounted across the both ends of the rack cage 103 and the rack cage insertion boss 25c of the mission case 25 to protect the rack cage 103 from muddy water and the like.

  The pinion gear 104 is fixed to a lower portion of a pinion operating shaft 108 that is vertically arranged in the front portion of the mission case 25, and an upper end of the pinion operating shaft 108 is a hydraulic pressure attached to an upper end of the mission case 25. The operation shaft 109a connected to the output shaft 109b of the power steering unit 109 and the steering handle 11 provided on the upper surface of the power steering unit 109 are interlocked and connected via the upper and lower universal joints 110 and the steering operation shaft 111. Yes. Therefore, by rotating the steering handle 11, the pinion operating shaft 108 is powerfully rotated via the power steering unit 109, and the rack 103? The rotating case 26 and the front wheel 1 pivotally supported by the rotating case 26 are steered in the steering wheel rotating direction.

  Here, the pinion operating shaft 108 is inserted between the internal transmission mechanism incorporated in the mission case 25 and the case front wall in a vertical posture so as to be positioned at the center in the left-right direction of the fuselage, and the lower end thereof is arranged. Projecting downward from the pinion gear 104, the projecting shaft portion is supported by the mission case 25 via a bearing 112 such as a ball bearing.

  The power steering unit 109 is disposed on the dividing line in the transmission case 25 having a left and right divided structure, and is bolted and connected only to the upper surface of the right dividing case portion 25R.

  Further, the steering structure and the left and right side clutch 55 for the rear rear wheel 2 are linked to each other, and the automatic steering for automatically disengaging the side clutch 55 of the rear wheel 2 on the inside of the turn in conjunction with the aircraft steering operation. Mechanism A is provided.

  As shown in FIG. 11, the automatic steering mechanism A interlocks the left and right knuckle arms 101 and the operation levers 66 a of the left and right clutch operation shafts 66 in a crossover manner with a linkage rod 113 having a long hole interchange c. As shown in FIG. 11 (a), when the front wheel 1 is in the straight traveling position, the left and right side clutches 55 are both in the “clutch-engaged” state, and straight traveling with four-wheel drive is performed. When the front wheel 1 is steered less than the set angle (several tens of degrees) from this straight traveling state, the rotational displacement of the knuckle arm 101 is absorbed by the long hole interchange c, and the linkage lock 113 is operated. The left and right side clutches 55 are both maintained in the “clutch engaged” state. In other words, the automatic steering mechanism does not work for the steering that slightly changes the direction of the aircraft. Then, when the front wheel 1 is steered largely, for example, to the left by a set angle (several tens of degrees) or more from the straight traveling state for a U-turn turning at the shore, as shown in FIG. Further, the right knuckle arm 101 is pivotally displaced larger than the long hole interchange c, and only one linkage rod 113 linked to the left clutch operating shaft 66 is pulled forward and displaced, and only the left clutch operating shaft 66 is displaced. Is operated forward. Accordingly, in this case, the side clutch 55 of the left rear wheel 2 on the inner side of the turn automatically enters the “clutch disengaged” state, and the rear wheel 2 on the inner side of the turn enters the idle state, and the left and right wheels steered to the left largely The vehicle turns to the left with a small turning radius by three-wheel drive by the front wheel 1 and the right rear wheel 2 on the outside of the turn.

  The hydraulic power source of the power steering unit 109 and the hydraulic cylinder 4 for raising and lowering the seedling planting device and the hydraulic pump 114 serving as the charge hydraulic power source of the continuously variable transmission 35 are extended from the input shaft 36 of the continuously variable transmission 35. It is driven by the power extracted from the end. The hydraulic pump 114 uses lubricating oil stored in the transmission case 25 as hydraulic oil, so that the oil extracted from the lower front portion of the transmission case 25 is sucked into the hydraulic pump 114 through the cartridge type filter 115. The filter 115 and the hydraulic pump 114 are connected in communication via an oil passage d formed in the front wall of the transmission case 25. Here, the oil passage d is formed by matching the concave grooves 116 formed on the joint surfaces of the left and right divided case portions 25L and 25R constituting the mission case 25 without requiring external piping. In addition, there is formed a hydraulic oil suction passage without processing and without piping.

  The rice transplanter of the present invention is configured as described above, and the disassembly and maintenance of the mission case 25 having the left and right divided structure is performed as follows.

  That is, when disassembling and servicing, the left front wheel 1 and the rear wheel 2 are removed, and the left swing case 28 is removed from the transmission case 25, and the rotation case 26 of the left front wheel 1 and the steering mechanism 102 are connected. With the linkage between the left side clutch and the automatic steering mechanism A released, all the bolt connections connecting and connecting the left and right divided case portions 25L and 25R are released, and the left vertical frame portion 34d of the support frame 34 is released. When the bolt connection between the lower end of the transmission case and the transmission case 25 is released, and further, the bolt connection between the front end of the left oblique frame rod 34d and the left divided case portion 25L is released, as shown in FIG. The divided case portion 25L can be moved separately in the axial direction of the transmission shafts that are horizontally mounted inside.

  In this case, since the support frame 34, the PTO shaft 88, and the power steering unit 109 remain connected to the right split case portion 25R, the mechanisms and structures linked to them do not need to be disassembled or separated.

  [Other Examples]

  (1) As shown in FIG. 18, it can also be implemented with manual steering specifications. In this case, the lower end mounting seat of the handle post 117 through which the steering operation shaft 111 is inserted and supported is connected and fixed to the upper surface of one of the divided case portions 25R instead of the power steering unit 109, and one division of the transmission case 25 is performed. When the case portion 25L is separated and the inside is inspected and maintained, it is not necessary to remove the handle post 117.

  (2) The oil passage d formed between the joint surfaces of the mission case 25 may be formed by forming the concave groove 116 only on one of the joint surfaces.

Whole side view of rice transplanter Overall plan view of rice transplanter Side view of the front of the aircraft Partially cutaway plan view showing the aircraft's traveling system Front view showing the front wheel drive unit Transmission system diagram Longitudinal rear view showing the internal structure of the mission case Cross-sectional plan view showing the power branch to the rear wheels Longitudinal side view of the front of the mission case Partially cutaway front view showing steering structure Schematic plan view showing automatic steering operation Aircraft side view Left side view of the rear of the aircraft Right side view of the rear of the aircraft Plan view of the rear of the aircraft Longitudinal front view of the rear of the aircraft Longitudinal front view showing the rear of the fuselage Side view of the front of the fuselage in the examples with different steering specifications

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 3 Traveling machine body 5 Lifting / lowering link mechanism 6 Seedling planting device 25 Mission case 25L Split case part 25R Split case part 34 Support frame
34d frame
34e frame
78 Connecting portion 88 PTO shaft 109 Power steering unit
111 Steering operation shaft 116 Concave groove 117 Handle post d Oil passage

Claims (5)

In a riding rice transplanter in which a seedling planting device is connected to a rear portion of a four-wheel drive type traveling machine body having a steerable front wheel and a non-steerable rear wheel via a lifting link mechanism,
The transmission case that supports the front wheel and the rear wheel is configured in a left and right split structure, and a support frame that is connected to the base of the lift link mechanism is erected on the transmission case ,
Wherein the support frame respectively while bolted connection split case portions of the left and right of the transmission case, and configured to be separable one split case part of releasing the connection between the support frame from the other split case portions tare The
The support frame comprises a pair of left and right frame rods connected to each of the left and right split case portions from the upper part at the connection portion of the base of the lift link mechanism,
The one split case portion includes a connecting portion projecting from the split case portion, and the frame rod connected to the one split case portion is connected to the front end portion of the frame rod inside the connecting portion. The body structure of the riding rice transplanter characterized by being connected to the connecting portion in a positioned state . The power steering unit for steering the front wheels is disposed on a dividing line of the transmission case, and the power steering unit is connected and supported only to the other divided case portion that is not released from the connection with the support frame. The body structure of the riding rice transplanter according to 1. A handle post that supports the steering operation shaft for steering the front wheels is disposed on the transmission case, and the handle post is connected and supported only to the other divided case portion that is not released from the support frame. The body structure of the riding rice transplanter according to claim 1.   The riding according to any one of claims 1 to 3, wherein a PTO shaft for driving the seedling planting device provided in the mission case is provided so as to protrude from the other divided case portion that is not released from the connection with the support frame. Aircraft structure of rice transplanter. The separate casing portion provided with a groove on at least one hand of the bonding surfaces of the aircraft passenger rice planting machine according to any one of claims 1 to 4 is formed an oil passage in the hydraulic system between the joint surfaces Construction.

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