WO2010106852A1

WO2010106852A1 - Rice planting machine

Info

Publication number: WO2010106852A1
Application number: PCT/JP2010/052041
Authority: WO
Inventors: 智之黒田; 誠井上
Original assignee: ヤンマー株式会社
Priority date: 2009-03-16
Filing date: 2010-02-12
Publication date: 2010-09-23
Also published as: JP2010213617A; CN102355811B; CN102355811A; KR20110129378A; JP5253250B2; KR101741606B1

Abstract

A rice planting machine configured in such a manner that a ground leveling rotor drive structure for taking out power to the ground leveling rotor (80) side can be disposed at low cost. A rice planting machine provided with: a travel machine body (1) on which an engine (21) is mounted; a seedling planting device (2) mounted on the rear side of the travel machine body (1) with a lifting/lowering link mechanism (67) provided therebetween; a rear axle case (33) on which left and right rear wheels (4) are mounted with left and right rear wheel axles (43) provided therebetween; a ground leveling rotor (80) for leveling off the surface of the field in which the planting is to be performed; and a distribution shaft (91) for transmitting rear wheel travel power to the left and right axles (43). The rear axle case (33) has formed therein an input shaft case section (43a) to which a rear wheel travel input shaft (75) is provided, left and right final gear case sections (43b) to which left and right axles are provided, and a side clutch case section (43c) to which the distribution shaft (91) is provided. Power is transmitted to the ground leveling rotor (80) through the ground leveling rotor drive shaft (85). A drive shaft case section (43d) is formed in the rear axle case (33), a ground leveling rotor drive shaft (85) is provided to the drive shaft case section (43d), and the drive shaft case section (43d) is provided under the input shaft case section (43a) in a double tier arrangement.

Description

Rice transplanter

The present invention relates to a rice transplanter that includes a seedling planting device having a seedling stand, a planting claw, and the like, and that continuously performs seedling planting work, and more particularly, to a rice transplanter that includes a ground leveling rotor for scribing work.

Conventionally, rice transplanters have been equipped with a ground leveling rotor for scribing in front of a seedling planting device having a seedling stand and a planting claw, and plant seedlings while leveling the rice field. In the leveling rotor, for example, a leveling rotor driving shaft is connected to an input shaft of a rear axle case that transmits power from the engine via a gear or the like, and the leveling rotor is driven by the leveling rotor driving shaft. A gear for connecting the leveling rotor drive shaft to the input shaft of the rear axle case is disposed on the power take-out case provided on the front side of the rear axle case (see Patent Documents 1 and 2).

JP 2004-113185 A JP 2007-252228 A

In the conventional configuration, it is necessary to provide a power take-out case separately from the rear axle case, and to separately provide a drive shaft gear and a distribution shaft gear for interlocking with the leveling rotor drive shaft. There is a problem that the manufacturing cost cannot be reduced.

Further, in the conventional configuration, when the leveling rotor drive gear or the like is disposed in the rear axle case, the front end side and the rear end side of the leveling rotor drive shaft protrude from the front side and the rear side of the rear axle case. In the specification in which the shaft hole is opened to the front side and the rear side of the rear axle case and the leveling rotor drive shaft is removed, there is a problem that the seal structure for closing the opening becomes complicated. By assembling the bearing bearings on the front end side and the rear end side of the leveling rotor drive shaft from both the front and rear, there is a problem that the assembling work of the leveling rotor drive shaft becomes complicated.

Also, in the conventional configuration, it is necessary to provide a power take-out case separately from the rear axle case, and to separately provide a drive shaft gear and a distribution shaft gear for interlocking the leveling rotor drive shaft. There are problems such as being unable to configure.

The present invention solves the above-described problem, and provides a rice transplanter in which a leveling rotor driving structure for extracting power to the leveling rotor side can be arranged at low cost.

In order to achieve the object, a rice transplanter according to the invention described in claim 1 includes a traveling machine body on which an engine is mounted, and a seedling planting device installed on the rear side of the traveling machine body via a lifting link mechanism. A rear axle case in which left and right rear wheels are arranged via left and right rear axles, a leveling rotor for leveling the planting surface, and a distribution shaft for transmitting rear wheel driving power to the left and right axles. In a rice transplanter formed with an input shaft case portion for providing a rear wheel travel input shaft, left and right final gear case portions for providing left and right axles, and a side clutch case portion for providing the distribution shaft, the leveling rotor is driven by the leveling rotor. A structure for transmitting power via a shaft, wherein a drive shaft case portion is formed in the rear axle case, the leveling rotor drive shaft is provided in the drive shaft case portion, and the input shaft But on the bilayered the drive shaft case portion below the over scan portion.

According to a second aspect of the present invention, in the rice transplanter according to the first aspect, the rear wheel traveling input shaft that transmits power from the engine to the rear axle case and the power of the rear wheel traveling input shaft are transmitted. A leveling rotor drive shaft that branches and transmits to the leveling rotor is provided, wherein a rearward shaft hole for inserting the leveling rotor driving shaft is formed in the rear axle case, and is opened toward a rear surface side of the rear axle case The ground leveling rotor drive shaft can be extracted from the rearward shaft hole formed to the rear side of the rear axle case.

According to a third aspect of the present invention, in the rice transplanter according to the first aspect, the rear axle case has a rear wheel traveling input shaft to which power from the engine is transmitted and the rear wheel traveling input shaft. A distribution shaft that transmits power to the left and right rear wheels in conjunction with each other and a leveling rotor drive shaft that transmits power to the leveling rotor in conjunction with the rear wheel traveling input shaft are provided, and enters the rear axle case. The rear wheel travel input shaft is provided with a distribution shaft gear for interlocking the distribution shaft, and a drive shaft gear for interlocking the leveling rotor drive shaft is formed in the distribution shaft gear. It is what.

According to a fourth aspect of the present invention, in the rice transplanter according to the first aspect, the rear axle case has a rear wheel traveling input shaft to which power from the engine is transmitted and the rear wheel traveling input shaft. A distribution shaft that transmits power to the left and right rear wheels in conjunction with each other, and a leveling rotor drive shaft that transmits power to the leveling rotor in conjunction with the rear wheel travel input shaft; Further, the distribution shaft is coupled via an input side bevel gear and an output side bevel gear, and the leveling rotor drive shaft is offset in a direction away from the output side bevel gear across the rear wheel travel input shaft in plan view. It is provided.

The invention according to claim 5 is the rice transplanter according to claim 3, further comprising a leveling rotor clutch that turns on and off power transmission to the leveling rotor drive shaft, wherein the distribution shaft gear is a bevel gear. The drive shaft gear is formed by a flat gear, the flat gear is formed with a larger diameter than the bevel gear, and the leveling rotor drive shaft is arranged in parallel to the rear wheel travel input shaft, and the leveling rotor The leveling rotor clutch is provided in front of the spur gear of the drive shaft.

According to a sixth aspect of the present invention, in the rice transplanter according to the fourth aspect, a drive shaft flat gear is integrally formed on the input side bevel gear of the rear wheel input shaft, and the drive shaft flat gear is formed. The leveling rotor drive shaft is connected to the rear wheel travel input shaft via a gear.

The invention described in claim 7 is the rice transplanter according to claim 4, wherein the interlocking flat gear that connects the leveling rotor drive shaft to the rear wheel drive input shaft to the leveling rotor drive shaft, A leveling rotor clutch that displaces power transmission from the rear wheel input shaft to the leveling rotor drive shaft and a bearing for the leveling rotor drive shaft are arranged to constitute a leveling rotor drive unit, and from the rear side of the rear axle case The leveling rotor drive unit is provided so as to be extractable.

According to the first aspect of the present invention, a traveling machine body equipped with an engine, a seedling planting device installed on the rear side of the traveling machine body via a lifting link mechanism, and left and right via left and right rear wheel axles. A rear axle case for arranging the rear wheels, a leveling rotor for leveling the planting surface, and a distribution shaft for transmitting rear wheel driving power to the left and right axles, the rear axle case having an input shaft for providing a rear wheel driving input shaft In a rice transplanter formed with a case part, left and right final gear case parts for providing left and right axles, and a side clutch case part for providing the distribution shaft, the structure transmits power to the leveling rotor via a leveling rotor drive shaft. A drive shaft case portion is formed in the rear axle case, the leveling rotor drive shaft is provided in the drive shaft case portion, and the drive shaft case portion is provided below the input shaft case portion. Since but on the bilayered, it can be arranged leveling rotor drive structure for taking out the power to the ground leveling rotor side at a low cost. The drive shaft case portion can be formed long in the front-rear direction by utilizing the front-rear width of the input shaft case portion and the side clutch case portion. That is, the drive shaft case portion can be formed with a sufficient length in the front-rear direction necessary for housing the leveling rotor drive shaft. By the two-layer structure of the input shaft case portion and the drive shaft case portion, the input shaft case portion and the drive shaft case portion are reinforced with each other, thereby reducing the weight while maintaining rigidity.

According to a second aspect of the present invention, the rear axle traveling input shaft that transmits power from the engine to the rear axle case and the power of the rear wheel traveling input shaft are branched and transmitted to the leveling rotor. A leveling rotor drive shaft is provided, wherein a rearward shaft hole for inserting the leveling rotor drive shaft is formed in the rear axle case, and from the rearward shaft hole opened toward the rear surface side of the rear axle case, Since the ground leveling rotor drive shaft can be pulled out from the rear side of the rear axle case, it is not necessary to provide a case for arranging the leveling rotor drive gear and the like separately from the rear axle case. The leveling rotor drive shaft can be easily installed on the rear axle case. When the leveling rotor drive shaft is not required, the rearward shaft hole can be easily closed with a lid. For example, even after the rice transplanter is shipped, the specification can be easily changed to a specification that does not include the leveling rotor or a specification that includes the leveling rotor.

According to a third aspect of the present invention, the rear axle case has a rear wheel travel input shaft to which power from the engine is transmitted, and the left and right rear wheels linked to the rear wheel travel input shaft. A distribution shaft for transmitting power and a leveling rotor drive shaft for transmitting power to the leveling rotor in conjunction with the rear wheel traveling input shaft are provided, and the rear wheel traveling input shaft rushed into the rear axle case The structure is provided with a distribution shaft gear for interlocking the distribution shaft, and the drive shaft gear for interlocking the leveling rotor drive shaft is formed in the distribution shaft gear. The shaft gear and the distribution shaft gear can be configured at low cost, and the drive shaft gear and the distribution shaft gear can be assembled compactly by utilizing the rear axle case.

According to a fourth aspect of the present invention, the rear axle case has a rear wheel traveling input shaft to which power from the engine is transmitted, and the left and right rear wheels linked to the rear wheel traveling input shaft. A distribution shaft for transmitting power and a leveling rotor drive shaft for transmitting power to the leveling rotor in conjunction with the rear wheel traveling input shaft are provided. An input side bevel gear and an output side bevel gear are provided on the rear wheel traveling input shaft. Since the distribution shaft is connected via, and the leveling rotor drive shaft is offset in a direction away from the output bevel gear across the rear wheel travel input shaft in plan view, The leveling rotor drive shaft can be supported at the position of the rear axle case corresponding to the input portion of the leveling rotor. The mounting width dimension in the vertical direction of the rear wheel travel input shaft and the leveling rotor drive shaft can be made compact. The leveling rotor drive shaft can be assembled to the rear axle case without causing the rear axle case to protrude downward and with almost no restriction on the arrangement of the rear wheel travel input shaft.

According to a fifth aspect of the present invention, there is provided a leveling rotor clutch for turning on and off power transmission to the leveling rotor drive shaft, wherein the distribution shaft gear is formed by a bevel gear, and the drive shaft gear is provided. Is formed by a spur gear, the spur gear is formed to have a larger diameter than the bevel gear, a ground leveling rotor drive shaft is arranged in parallel to the rear wheel travel input shaft, and a front side of the flat gear of the leveling rotor drive shaft. Since the leveling rotor clutch is provided, the drive shaft gear and the distribution shaft gear can be easily processed by forging or the like, and the manufacturing cost can be reduced. In the rear axle case, the leveling rotor drive shaft can be extended forward of the spur gear, and the leveling rotor clutch can be installed compactly in front of the leveling rotor drive shaft.

According to a sixth aspect of the present invention, a drive shaft spur gear is formed integrally with the input side bevel gear of the rear wheel travel input shaft, and the rear wheel travel is connected via the drive shaft spur gear. Since the leveling rotor driving shaft is connected to the input shaft, the rear wheel traveling input shaft or the leveling rotor driving shaft can be attached to and detached from the rear axle case by inserting and removing in the axial direction. Assembling / disassembling workability of the rear wheel traveling input unit including the rear wheel traveling input shaft or assembly / disassembling workability of the leveling rotor driving unit including the leveling rotor driving shaft can be improved.

According to a seventh aspect of the present invention, the leveling rotor driving shaft, the interlocking flat gear for connecting the leveling rotor driving shaft to the rear wheel traveling input shaft, and the leveling rotor from the rear wheel traveling input shaft. The leveling rotor drive unit is configured by arranging a leveling rotor clutch that turns on and off the power transmission to the drive shaft and a bearing for the leveling rotor drive shaft, and the leveling rotor drive unit can be pulled out from the rear side of the rear axle case Therefore, the leveling rotor drive shaft can be attached to and detached from the rear axle case by inserting / removing the leveling rotor drive shaft in the axial direction. The assembly / disassembly workability of the leveling rotor drive unit can be improved.

It is a left view of a rice transplanter. It is a top view of a rice transplanter. It is a left view of the traveling body of a rice transplanter. It is a top view of the traveling body of a rice transplanter. It is a side view of a seedling planting device and a leveling device. It is a top sectional view of a rear axle case. It is side surface sectional drawing of a rear axle case. It is side surface explanatory drawing of a leveling rotor drive shaft. It is a plane explanatory view of the leveling rotor drive shaft. It is a back surface explanatory view inside a rear axle case. It is a drive system figure of a traveling machine body. It is a side view of the leveling apparatus of 2nd Embodiment.

Hereinafter, a rice transplanter according to an embodiment of the present invention will be described with reference to FIGS. In the following description, the left side in the forward direction of the rice transplanter (traveling machine body 1) is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side. As shown in FIGS. 1 and 2, the rice transplanter has a traveling machine body 1 and a seedling planting device 2 connected to a rear portion of the traveling machine body 1 so as to be movable up and down. The traveling body 1 includes a pair of left and right front wheels 3, a pair of left and right rear wheels 4, a driver seat 5 on which a driver sits, a steering handle 6 disposed in front of the driver seat 5, and a steering handle 6. A bonnet 7 covering the lower end side is provided.

A steering mechanism 8 for steering that changes the direction of the front wheels 3 is disposed on the lower end side of the steering handle 6 that is disposed at the center of the left-right width of the traveling machine body 1. Further, left and right spare seedling stands 9 on which a plurality of mat-like spare seedlings are placed in multiple stages are provided on the traveling body 1 on both the left and right sides of the bonnet 7. Behind the driver's seat 5 is provided a fertilizer application device 10 that buryes granular fertilizer in the mud on the side of the seedlings planted on the rice field.

Further, as shown in FIGS. 1 to 3, the traveling machine body 1 is provided with a vehicle body frame 12 and an engine 21. An engine 21 is attached to the vehicle body frame 12 below the driver seat 5. A mission case 22 provided with a hydraulic continuously variable transmission or a transmission gear group is disposed in front of the engine 21. The engine 21 is disposed at a position along the longitudinal center line of the traveling machine body 1. In other words, the engine 21 is disposed in the center of the left and right width of the traveling machine body 1.

As shown in FIG. 3, the engine 21 is arranged in a lateral orientation in which the crankshaft 23 extends in the left-right direction. A pulley 24 is attached to the left end portion of the crankshaft 23, and the power of the engine 21 is transmitted to the transmission case 22 via a belt 25 wound around the pulley 24. An HST (hydrostatic continuously variable transmission) 26 is attached to the rear left side surface of the transmission case 22. Power from the engine 21 is transmitted to the input shaft 27 of the HST 26 by the belt 25 via the pulley 27a. A tension pulley 28 is in contact with the belt 25.

3 and 11, the rotational force of the PTO shaft 22a protruding rearward from the mission case 22 is input to the planting mission case 76. Power is transmitted from the planting mission case 76 to the planting shaft 2a projecting rearward and the fertilization drive shaft 77 projecting upward through the PTO shaft 22a. In the planting mission case 76, the ratio between the traveling speed and the driving speed (rotational speed) of the seedling planting device 2 can be changed, and the rotational speed of the PTO shaft 22a and the output shaft (planting shaft 2a) are operated from the outside. And by changing the relationship with the rotation speed of the fertilizer application shaft 92), the interval between the seedlings adjacent to each other (between the stocks) can be changed.

Left and right front axle cases 30 are attached to the left and right side surfaces of the front portion of the mission case 22. The left and right front wheels 3 are respectively supported rotatably and steerable on left and right front wheel axles 31 provided on the left and right front axle cases 30. A traveling drive shaft 32 extends rearward from the mission case 22. The driving force of the rear wheel 4 output from the mission case 22 is transmitted to the inside of the rear axle case 33 via the traveling drive shaft 32. The rear axle case 33 is provided with a rear wheel traveling input shaft 75 that is linked to the traveling drive shaft 32.

The rear axle case 33 is disposed obliquely below the rear side of the engine 21. The transmission case 22 and the rear axle case 33 are in the shape of the central axis of the traveling machine body 1 and are integrally connected by a pipe connection frame 13. A rear wheel axle 34 protrudes from the rear axle case 33 to the left and right. The left and right rear wheels 4 are pivotally supported on the left and right rear wheel axles 34 so as not to be relatively rotatable. The rear axle case 33 is connected to the vehicle body frame 12 by two right and left rear columns 16. The rear column 16 is extended in the vertical direction in a posture slightly tilted forward with respect to the vertical line in a side view.

The upper surfaces of the engine 21, the mission case 22, and the like are covered with a vehicle body cover 37 on which an operator gets on. The vehicle body cover 37 has an integral structure, and a large number of slits are formed so that the left and right front wheels 3 can be seen. The driver's seat 5 is provided on the upper surface of the vehicle body cover 37, and is positioned approximately at the center of the left and right sides of the traveling machine body 1 and approximately above the front half of the inclined portion 12 a of the body frame 12 in a side view.

As shown in FIG. 2, a brake pedal 38 on the left side and an accelerator pedal 39 on the right side of the vehicle body cover 37 on the right side of the hood 7 above the right side of the traveling body 1 above the mission case 22 are shown. Each is arranged. In addition, around the hood 7 of the traveling machine body 1 and the like, various levers (main transmission lever, accelerator lever, planting lift lever 113 and the like), switches (leveling rotor lift switch and the like), and dials are provided. The front panel (not shown) on the bonnet 7 is provided with a meter, a display, and the like.

Side markers 71 are provided on the left and right of the seedling planting device 2. The side marker 71 includes a marker ring 72 for muscle drawing that forms a planting locus for the next stroke on the unplanted surface, and a rod-shaped marker arm 73 that rotatably supports the marker ring 72 on the tip side. Yes. The marker arm 73 is rotatably supported by the planting machine body 50. By rotating (raising / lowering) the marker arm 73, the marker wheel body 72 is configured to be movable between a work posture landed on the surface and a storage posture in which the marker wheel body 72 is raised to the ground.

A fertilizer device 10 is arranged behind the driver seat 5. The fertilizer application device 10 includes a hopper 40 for putting granular fertilizer. The granular fertilizer in the hopper 40 that is quantitatively sent out through the fertilizer feeding unit of the fertilizer application apparatus 10 is transferred to the seedling planted by the seedling planting apparatus 2 through the flexible hose 42 by the blower conveying action of the blower 41. Dropped into the mud of the adjacent paddy field.

The seedling planting device 2 includes six planting claw mechanisms 45 driven by power from the engine 21 input via the mission case 22, a seedling mounting platform 46 for six strips, and each planting transmission. And a float 47 for uniforming the surface, which is installed on the lower surface side of the case 44.

As shown in FIG. 1 to FIG. 4, the seedling stage 46 is provided in a posture inclined in front and rear and low. Through the upper guide rail 48 and the lower rail 49, the seedling stage 46 is supported by the planting frame 51 and the left and right side frames 52 of the planting machine body 50 so as to be able to reciprocate in the left and right directions. The planting machine body 50 includes a rectangular tube-shaped planting frame 51 that is disposed on the lower front side of the seedling mount 46, left and right side frames 52 that are erected from both the left and right sides of the planting frame 51, An upper connection frame 53 that connects upper end sides of the left and right side frames 52 and a rotor lifting shaft 54 that connects upper and lower intermediate portions of the left and right side frames 52 are provided. The upper connecting frame 53 is fixedly welded to the side frame 52 via an upper bracket 52a, and the rotor lifting / lowering shaft 54 is rotatably provided to the side frame 52 via an intermediate bracket 52c.

As shown in FIG. 1, a hitch bracket 62 is connected to the center position of the planting frame 51 through a rolling fulcrum shaft (not shown). A hitch bracket 62 is connected to the rear side of the vehicle body frame 12 (the traveling machine body 1) via an elevating link mechanism 65 including a top link 63 and a lower link 64. A hydraulic lifting cylinder 66 attached to the vehicle body frame 12 is connected to the lower link 64. The seedling planting device 2 moves up and down via the lifting link mechanism 65 when the lifting cylinder 66 is driven. In addition, the seedling planting device 2 rotates around the rolling fulcrum shaft, and the inclined posture in the left-right direction is changed.

Also, the planting shaft 2a is projected from the mission case 22 toward the rear side. A driving force from the planting shaft 2a is applied to a planting input shaft (not shown) projecting from the planting input case (not shown) attached to the center of the planting frame 51 toward the front side. It is transmitted via a universal joint shaft 61 (see FIG. 1). By the driving force transmitted to the planting input shaft, the lateral feed operation of the seedling stage 46 in the horizontal direction, the vertical feeding operation of the mat-like seedlings on the seedling stage 46, and the rotational driving of the planting claw mechanism 45 are performed. It is configured to be performed.

As the planting claw mechanism 45, a planting transmission case 44 that supports the rotary case 55 is connected to the rear portion of the planting frame 51 in a rearward cantilever manner. Planting transmission cases 44 are respectively attached to the left and right side end portions and the center portion of the planting frame 51 in a total of three locations. The planting transmission case 44 is pivotally supported by two rotary cases 55 that rotate at a constant speed in one direction. A pair of claw cases 56 are disposed at symmetrical positions around the rotational axis of the rotary case 55. A planting claw 57 is attached to each claw case 56. That is, when the seedling planting device 2 is lowered, two seedlings are taken out by the two planting claws 57 from the seedling mount 46 that is reciprocated to the left and right by one rotation of the rotary case 55, and the float 47 1 seedlings are planted continuously by the two planting claws 57 on the field leveled by the above, and 6 seedling planting operations are continuously performed.

A fulcrum shaft 67 for adjusting the planting depth extending in the left-right direction is rotatably attached to the lower side of the planting frame 51. As shown in FIG. 5, a bracket 68 attached to the upper surface of each float 47 is connected to a fulcrum shaft 67 via an adjustment link 69. By operating the planting depth adjusting lever 67a that fixes the base end to the fulcrum shaft 67, the reference planting depth of the seedling is adjusted (see FIG. 1). Note that a change in the inclination angle of the float 47 is detected by a lifting link (not shown) connected to the float 47 at the center position, thereby enabling automatic planting depth control.

A leveling device 35 is provided in front of the seedling planting device 2. The leveling device 35 includes a leveling rotor 80 provided in front of the float 47, a rotor support vertical frame 130 that supports the leveling rotor 80 on the planting machine body 50, a leveling rotor drive unit 82 provided on the rear axle case 33, And a universal joint shaft 36 for transmitting the power of the rotor drive unit 82 to the leveling rotor 80.

The leveling rotor 80 includes a single rotor shaft 81 extending in the left-right direction, a plurality of blade-like rotor pieces 83 disposed on the rotor shaft 81, and a leveling rotor transmission disposed substantially at the center in the left-right direction of the rotor shaft 81. A case 84 and a rotor cover 140 covering the top of the rotor piece 83 are provided. The power transmitted from the leveling rotor drive unit 82 via the universal joint shaft 36 is transmitted to the rotor shaft 81 to rotate the rotor shaft 81 and the rotor piece 83. That is, the rice padding device 2 is configured such that the left and right width rice fields (the rice field having the six planting widths) are leveled by the rotor piece 83.

The leveling rotor 80 includes a rotor lifting / lowering mechanism 141 that moves up and down independently of the seedling planting device 2. The rotor lifting mechanism 141 moves up and down by operating a rotor lifting handle 133 described later. The rotor lifting mechanism 141 has a pipe-shaped rotor support vertical frame 130 that extends downward from the left and right side frames 52 of the planting machine body 50. A rotor shaft 81 is rotatably connected to the lower end side of the rotor support vertical frame 130.

The rotor support vertical frame 130 is connected to the side frame 52 via an upper link 131 and a lower link 132 that form a parallel link mechanism. A rotor elevating shaft 54 is rotatably attached to the side frame 52 via an intermediate bracket 52b. Further, one end side of the upper link 131 is fixed to the rotor elevating shaft 54, and the other end side of the upper link 131 is rotatably connected to the rotor support vertical frame 130. One end side of the lower link 132 is rotatably connected to the lower end side of the side frame 52 via the lower bracket 52c, and the other end side of the lower link 132 is rotatably connected to the rotor support vertical frame 130.

At the position close to the right side frame 52 of the rotor lifting / lowering shaft 54, the base end side of the rotor lifting / lowering handle 133 that lifts and lowers the leveling rotor 80 is welded and fixed. An operation part of the rotor lifting / lowering handle 133 is extended forward. The right side frame 52 is provided with a position holding body 134 that engages and disengages the middle of the rotor lifting handle 133. The position elevating handle 133 is held at the operation position by the position holding body 134. The position holding body 134 is formed with a plurality of notches (not shown) for releasably engaging the rotor lifting handle 133.

With the above configuration, when the operator grasps the rotor lifting handle 133 and rotates it upward or downward, the upper link 131 rotates around the rotor lifting shaft 54. As the upper link 131 rotates, the leveling rotor 80 moves up or down in a substantially vertical direction by a parallel link operation through the rotor support vertical frame 130 connected to the upper link 131. The leveling rotor 80 moves to the ascending position (non-working position) or the descending position (landing work position). By engaging the rotor lifting handle 133 with the receiving portion of the position holding body 134, the leveling rotor 80 is held at a predetermined height. The vertical movement of the leveling rotor 80 is performed in an unlinked manner with the seedling planting device 2, so that even when the seedling planting device 2 is supported at the lowered position (landing work position), the leveling rotor 80 is moved to the raised position. It can be supported at (non-working position).

The front end side of the wire connecting arm 138 that protrudes rearward is fixedly welded to the rotor lifting shaft 54. One end side of the clutch interlocking wire 136 is connected to the rear end side of the wire connecting arm 138 via a wire connecting piece 135. The other end side of the clutch interlocking wire 136 is connected to the rear end side of the clutch on / off arm 137 provided on the left outer surface of the left rear column 16. The clutch on / off arm 137 is pivotally supported by the rear column 16 at the longitudinal center extending in the front-rear direction.

The front end side of the clutch on / off arm 137 is connected to the drive clutch operating arm 106 of the rear axle case 33 via a connecting rod 139. When the leveling rotor 80 moves to the ascending position (non-working position) or the descending position (landing work position), the clutch on / off arm 137 rotates via the clutch interlocking wire 136 in conjunction therewith, whereby the connecting rod The drive clutch actuating arm 106 is rotated via 139 so that the leveling rotor clutch 89 for turning on and off the power transmission to the leveling rotor 80 is turned on and off.

For example, the leveling rotor clutch 89 is turned off via the clutch interlocking wire 136 when the operator rotates the rotor lifting handle 133 upward to move the leveling rotor 80 up to a predetermined height position. It is configured as follows. On the other hand, the leveling rotor clutch 89 is turned downward to move the leveling rotor 80 down to a predetermined height position so that the leveling rotor clutch 89 enters and operates via the clutch interlocking wire 136. ing.

The rear axle case 33 transmits power to the rear wheel traveling input unit 90 including the rear wheel traveling input shaft 75 connected to the traveling drive shaft 32 and the left and right rear wheels 4 in conjunction with the rear wheel traveling input shaft 75. A distribution shaft 91, a side clutch 93 disposed on each of the left and right ends of the distribution shaft 91, and a leveling rotor drive unit 82 including a leveling rotor drive shaft 85 interlocking with the rear wheel travel input shaft 75. Yes. The leveling rotor drive shaft 85 is connected to the rotor shaft 81 of the leveling rotor 80 via the universal joint shaft 36. A final case lid 94 on which the rear wheel axle 34 is disposed is provided on both the left and right sides of the rear axle case 33, and a final gear that transmits the power of the distribution shaft 91 to the rear wheel axle 34 is provided in the final case lid 94. A mechanism 95 is arranged.

The rear wheel travel input shaft 75 extending in the front-rear direction is provided on the left side of the connecting frame 13 in the rear axle case 33. The distribution shaft 91 extending in the left-right direction is provided behind the rear wheel travel input shaft 75. The distribution shaft 91 is supported by the rear axle case 33 via

distribution shaft bearings

91a and 91b. The leveling rotor drive shaft 85 extending in the front-rear direction is provided below the rear wheel travel input shaft 75 and offset to the left side of the rear wheel travel input shaft 75.

The rear axle case 33 is formed with an input shaft case portion 43a for providing a rear wheel input shaft 75, left and right final gear case portions 43b for providing left and right axles, and a side clutch case portion 43c for providing a distribution shaft 91. . Further, the power is transmitted to the leveling rotor 80 via the leveling rotor drive shaft 85, and the drive axle case portion 43 d is formed in the rear axle case 33. The leveling rotor drive shaft 85 is provided in the drive shaft case portion 43d, and the drive shaft case portion 43d is provided in two layers below the input shaft case portion 43a.

The input shaft case 43a is provided with a forward shaft hole 33a that opens in the front side wall 33c of the rear axle case 33, and the rear wheel travel input unit 90 can be attached to and detached from the rear axle case 33 through the forward shaft hole 33a. Is formed. The rear wheel travel input unit 90 includes a rear wheel travel input shaft 75 that projects forward from the forward shaft hole 33a, front and rear

input shaft bearings

96 and 97 that support the rear wheel travel input shaft 75, a distribution shaft 91, and leveling. A transmission gear body 100 to be described later for transmitting power to the rotor drive shaft 85 is provided.

A transmission gear body 100 is provided on the rear end side of the rear wheel travel input shaft 75. The transmission gear body 100 is integrally formed with a distribution shaft bevel gear 100a and a drive shaft flat gear 100b. An interlocking bevel gear 107 provided on the distribution shaft 91 is meshed with the distribution shaft bevel gear 100a. An interlocking flat gear 88 provided on the leveling rotor driving shaft 85 is meshed with the driving shaft flat gear 100b.

That is, the distribution shaft bevel gear 100a and the drive shaft flat gear 100b are integrally formed as a transmission gear body 100 by forging or the like. Since the distribution shaft bevel gear 100a and the drive shaft flat gear 100b are integrally formed, the rear wheel input shaft 75 is set within the rear axle case 33 by the installation dimension of the drive shaft flat gear 100b (the thickness of the gear 100b). The transmission gear body 100 can be provided on the rear wheel travel input shaft 75 simply by extending backward.

Since the drive shaft flat gear 100b (transmission gear body 100) is disposed on the rear end side of the rear wheel travel input shaft 75, the middle of the leveling rotor drive shaft 85 is connected to the rear end side of the rear wheel travel input shaft 75. it can. The leveling rotor drive shaft 85 can be disposed within the front and rear width of the rear axle case 33. Further, in the transmission gear body 100, the root diameter of the drive shaft flat gear 100b is set to be larger than the tooth tip diameter of the distribution shaft bevel gear 100a.

Since the rear wheel traveling input shaft 75 includes the front and rear

input shaft bearings

96 and 97 and the transmission gear body 100 to constitute the rear wheel traveling input unit 90, the rear axle case 33 faces forward. The rear wheel travel input unit 90 can be inserted into the shaft hole 33a, and the rear wheel travel input unit 90 can be mounted on the rear axle case 33.

Since the rear wheel travel input shaft 75 is disposed at a position closer to the left side of the rear axle case 33 with respect to the longitudinal center line of the vehicle body, the rear wheel travel input shaft 75 is for the distribution shaft that branches power from the rear wheel travel input shaft 75 to the distribution shaft 91 The bevel gear 100a and the interlocking bevel gear 107) are also arranged at a position closer to the left side of the distribution shaft 91. Left and right side clutches 92 are disposed at the left and right ends of the distribution shaft 91, and side clutch cam shafts 124 that turn the side clutches 92 on and off are provided on the inner sides of the side clutches 92.

As shown in FIG. 6, the side clutch 92 has a multi-plate structure and is configured to be turned off when the steering angle reaches a predetermined angle or more in conjunction with the operation of the steering handle 6. The steering handle 6 is connected to one end side of a rotating arm 120 disposed below the rear axle case 33 via a steering mechanism portion 8, an intermediate rod 112 that is long below the vehicle body frame 12, and a terminal rod 112 a. (See FIGS. 1 and 10). By rotating the steering handle 6, the intermediate rod 112 is pushed and pulled in the front-rear direction, and the turning arm 120 is turned in the left-right direction.

As shown in FIG. 6, the other end side of the rotating arm 120 is connected to the central portion of the operating arm 122 disposed above the rear axle case 33 via a fulcrum shaft 121 extending vertically through the rear axle case 33. Is done. The rotating arm 120, the fulcrum shaft 121, and the operating arm 122 rotate integrally. The left and right end portions of the operating arm 122 are provided so as to be able to contact and separate from one end of a pair of left and right intermediate arms 123. The operating arm 122 is displaced by the movement of the rod 112 to a position where it does not come into contact with either the left or right intermediate arm 123 or a position where either the left or right intermediate arm 123 is pressed.

As shown in FIG. 6, side clutch cam shafts 124 are provided at the other ends of the left and right intermediate arms 123 so as to be integrally rotatable, and the lower end side of the side clutch cam shaft 124 is extended downward to form a rear axle case 33. Inserted into. The cam surface 124 on the lower end side of the side clutch cam shaft 124 is in contact with the inner side of the side clutch 92. The side clutch 92 is turned on and off by the rotation of the side clutch cam shaft 124.

That is, when turning to the next stroke position on the headland in the field, the rod 112 is pushed or pulled by turning the steering handle 6 beyond a predetermined steering angle, so that the pivot arm 120 and the fulcrum shaft The operating arm 122 rotates via 121 and presses the intermediate arm 123 corresponding to the side clutch 92 inside the turn. When the intermediate arm 123 is pressed, the side clutch cam shaft 124 rotates, and the side clutch 92 on the inner side in the turning direction is turned off. In this way, when the turning operation is greater than the predetermined steering angle, the power transmission to the rear wheel 4 inside the turning is cut off in conjunction with the turning operation of the steering handle 6, thereby reducing the turning radius. The turning performance of the traveling machine body 1 is improved. When the steering handle 6 is turned to a predetermined steering angle or less, the side clutches 92 on both the inner side and the outer side of the turning are continuously maintained, and it is possible to prevent the meandering from being greatly meandered by the operation of the steering handle 6. Performance (straight running performance) can be improved.

Furthermore, as shown in FIG. 10, the leveling rotor drive shaft 85 is not disposed vertically below the rear wheel travel input shaft 75 but is offset from the rear wheel travel input shaft 75. Accordingly, it is possible to reduce interference between the connection portion between the rear wheel travel input shaft 75 and the distribution shaft 91 and the connection portion between the rear wheel travel input shaft 75 and the leveling rotor drive shaft 85 in the rear axle case 33. Even if a structure (leveling rotor drive unit 82) for branching power from the rear wheel traveling input shaft 75 to the leveling rotor drive shaft 85 is provided in the rear axle case, the vertical dimension of the rear axle case 33 is increased (the amount of downward projection). Can be reduced.

As shown in FIG. 10, the offset amount L of the leveling rotor drive shaft 85 with respect to the rear wheel travel input shaft 75 is set to such an extent that the leveling rotor drive shaft 85 and the rear wheel travel input shaft 75 overlap (wrap) in plan view. ing. Therefore, a structure (leveling rotor drive unit 82) that branches power from the rear wheel input shaft 75 to the leveling rotor drive shaft 85 can be provided in the rear axle case 33 without restricting the arrangement of the side clutch 93. .

A rear shaft hole 33 a is opened rearward on the rear surface of the rear axle case 33, and the rear end side of the leveling rotor drive shaft 85 projects rearward from the rear surface (rear shaft hole 33 a) of the rear axle case 33 and is connected to the universal joint shaft 36. ing. The leveling rotor drive unit 82 includes a leveling rotor drive shaft 85, front and rear

drive shaft bearings

86 and 87 for supporting the leveling rotor drive shaft 85 on the rear axle case 33, and a drive shaft flat gear 100b for the rear wheel travel input shaft 75. And a leveling rotor clutch 89 that turns power transmission from the rear wheel traveling input shaft 75 to the leveling rotor drive shaft 85 on and off.

As shown in FIG. 8, the

drive shaft bearings

86 and 87 are disposed on the front end side and the rear end side of the leveling rotor drive shaft 88. The interlocking flat gear 88 is disposed in the middle of the leveling rotor drive shaft 85. The leveling rotor clutch 89 is disposed on the front end side of the leveling rotor drive shaft 88.

As shown in FIGS. 7 and 8, the leveling rotor drive unit 82 is configured by arranging

drive shaft bearings

86, 87, an interlocking flat gear 88, and a leveling rotor clutch 89 on the leveling rotor drive shaft 85. Has been. The leveling rotor drive unit 82 is detachably provided to the rear axle case 33 using a rearward shaft hole 33b that projects the leveling rotor drive shaft 85 backward. Since the leveling rotor driving unit 82 is provided in the rear axle case 33, a special case for housing the leveling rotor driving unit 82 as in the conventional case is not necessary. The number of components can be reduced and the manufacturing cost can be reduced.

As shown in FIGS. 7 and 8, the front end side of the rearward shaft hole 33b is closed by the front side wall 33c of the drive shaft case portion 43d, and the rear end side of the leveling rotor drive shaft 85 faces rearward from the rear opening edge 33d of the rearward shaft hole 33b. It is protruding. The drive shaft bearing 86 is fitted to the bearing fitting front portion 115 inside the front side wall 33c of the rear axle case 33 so that the drive shaft bearing 86 can be pulled out rearwardly in the inner periphery of the rearward shaft hole 33b. Of the inner periphery of the rearward shaft hole 33b, a drive shaft bearing 87 is fitted inside the rear opening edge 33d of the rear axle case 33 so that it can be pulled out rearwardly. Accordingly, the leveling rotor is inserted by inserting the leveling rotor driving unit 82 into the rear opening of the rearward shaft hole 33b from the rear side of the rear axle case 33 so that the driving shaft bearing 86 is fitted to the bearing fitting front portion 115. A drive unit 82 (a set of structures for branching power from the rear wheel travel input shaft 75 to the leveling rotor drive shaft 85) is mounted on the drive shaft case portion 43d of the rear axle case 33.

7 and 8, the forward shaft hole 33a for supporting the rear wheel input unit 90 is formed in the input shaft case portion 43a of the rear axle case 33. As shown in FIG. A rearward shaft hole 33 b that supports the leveling rotor drive unit 82 is formed in the drive shaft case portion 43 d of the rear axle case 33. The front-rear direction width dimension of the side clutch case part 43c and the input shaft case part 43a and the front-rear direction width dimension of the drive shaft case part 43d are formed to be substantially equal. The drive shaft case portion 43d is provided in two layers below the input shaft case portion 43a and the side clutch case portion 43c. That is, the leveling rotor drive shaft 85 is disposed below the rear wheel travel input shaft 75 and the distribution shaft 91. The leveling rotor drive shaft 85 is extended in the front-rear direction so as to cross the distribution shaft 91 in parallel with the rear wheel travel input shaft 75.

As shown in FIGS. 7 and 8, the leveling rotor drive shaft 85 is disposed below the rear wheel travel input shaft 75, and the rear end of the leveling rotor drive shaft 85 connected to the universal joint shaft 36 is connected to the rear wheel axle 34. Since they are provided at substantially the same height, it is possible to ensure a range of raising and lowering the leveling rotor 80 that accompanies the raising and lowering of the seedling planting device 2 without making the inclination angle of the universal joint shaft 36 excessive.

Further, as shown in FIG. 8, when the ground leveling device 35 is not provided with the leveling rotor drive unit 82 removed from the rear axle case 33, the opening 108 of the rearward shaft hole 33 b is a lid 108 which is a sealing lid. Block with. That is, the configuration of the rear axle case 33 can be changed to a specification with the leveling device 35 or a specification without the leveling device 35 by simply attaching and detaching the lid 108 to the rear axle case 33. There is no need to change the specifications by replacing the rear axle case 33. Even after the rice transplanter is shipped without specifications of the leveling device 35, the lid 108 can be removed and the leveling rotor drive unit 82 can be inserted into the rearward shaft hole 33b, so that the leveling device 35 can be replaced without replacing the rear axle case 33. Can be installed.

7, 8, and 9, the interlocking flat gear 88 is engaged with the driving shaft flat gear 100 b of the rear wheel traveling input shaft 75. The interlocking flat gear 88 is disposed on the leveling rotor drive shaft 85 so as to be rotatable and non-slidable. A rotor drive clutch 89 is provided on the leveling rotor drive shaft 85 in front of the interlocking flat gear 88. The rotor driving clutch 89 includes a clutch shifter 102 slidably fitted to the leveling rotor driving shaft 85, a clutch pawl 101 formed on the clutch shifter 102, and the clutch shifter 102 facing the interlocking flat gear 88. A clutch spring 103 that presses and a drive clutch cam shaft 105 that slides the clutch shifter 102 along the axial direction against the clutch spring 103 are provided.

The clutch spring 103 is wound around the front end side of the leveling rotor drive shaft 85 and is disposed between the front end side of the clutch shifter 102 and the drive shaft bearing 86. On the outer periphery of the front end portion of the clutch shifter 102, a cam engagement piece 104 is formed in a bowl shape. One end side cam of the drive clutch cam shaft 105 is engaged with the cam engagement piece 104. The drive clutch cam shaft 105 protrudes outward from the left side surface of the rear axle case 33 (drive shaft case portion 43 d), and the drive clutch operating arm 106 is connected to the protruding end portion of the drive clutch cam shaft 105. .

¡The clutch shifter 102 is engaged and supported on the leveling rotor drive shaft 85. The clutch shifter 102 is key-fitted to the leveling rotor drive shaft 85 and is slidable in the axial direction of the leveling rotor drive shaft 85. The drive clutch operating arm 106 is operated via the clutch interlocking wire 136, the drive clutch cam shaft 105 rotates, and the clutch shifter 102 slides on the leveling rotor drive shaft 85 in the front-rear direction. .

With the above configuration, the clutch shifter 102 approaches the interlocking flat gear 88 by the downward movement of the leveling rotor 80, and the power transmitted to the leveling rotor drive shaft 85 is continued, and the clutch shifter 102 is interlocked with the interlocking flat gear 88. And the leveling rotor drive shaft 85 is driven. That is, when the clutch shifter 102 is slid to the interlocking flat gear 88 side by the clutch spring 103 and the clutch pawl 101 of the clutch shifter 102 is engaged with the interlocking flat gear 88, the rotation of the interlocking flat gear 88 is rotated. Is transmitted to the leveling rotor drive shaft 85 via the clutch shifter 102, and the leveling rotor drive shaft 85 is linked to the rear wheel travel input shaft 75 to transmit power to the leveling rotor 80.

On the other hand, the clutch shifter 102 is separated from the interlocking flat gear 88 by the upward movement of the leveling rotor 80, and the power transmitted to the leveling rotor drive shaft 85 is cut off. That is, when the drive clutch cam shaft 105 is rotated by the operation of the drive clutch operating arm 106 and the clutch shifter 102 is slid in the direction away from the interlocking flat gear 88 against the clutch spring 103, The rotation of the spur gear 88 is not transmitted to the leveling rotor drive shaft 85. Even if the rear wheel travel input shaft 75 rotates, the leveling rotor drive shaft 85 does not rotate, so the leveling rotor 80 stops.

For example, in the seedling planting work such as water filling planting, middle split planting, headland planting, etc., when the operator does not perform the shaving work with the leveling rotor 80, the operator rotates the rotor lifting handle 133 upward as described above. As described above, the leveling rotor clutch 89 is turned off as the leveling rotor 80 rises.

Next, a second embodiment in which a rotor lifting / lowering motor 109 that lifts and lowers the leveling rotor 80 will be described with reference to FIG. A rotor elevating motor 109 for elevating and lowering the leveling rotor 80 is provided. The rotor lifting / lowering motor 109 is an electric motor. A rotor lifting / lowering motor 109 is provided at a position near the lower end of the side frame 52 via a motor bracket 52d. A rotor lifting / lowering upper arm 142 is provided on a rotor lifting / lowering shaft 109 a which is an output shaft of the rotor lifting / lowering motor 109. The rotor lifting / lowering arm 143 is connected to the lower link 132 via the rotor lifting / lowering upper arm 142. As the rotor lifting / lowering motor 109 rotates forward or backward, the rotor lifting / lowering shaft 109a rotates, rotates the lower link 132, moves the rotor support vertical frame 130 up and down, and moves the leveling rotor 80 up and down.

The rotor lifting / lowering motor 109 rotates normally or reversely by operating the leveling rotor lifting / lowering switch 114 provided on the front panel. The operator operates the leveling rotor raising / lowering switch 114 to move the rotor support vertical frame 130 upward, so that the leveling rotor 80 is held at the raised position (non-working position) separated from the planting surface. On the contrary, when the operator operates the leveling rotor up / down switch 114 to move the rotor support vertical frame 130 downward, the leveling rotor 80 is held at the lowered position (working position) where it lands on the planting surface. The vertical movement of the leveling rotor 80 is performed in conjunction with the vertical movement of the seedling planting device 2. Even if the seedling planting device 2 is in the lowered position (working position), the leveling rotor 80 can be supported in the raised position (non-working position).

The rotor lifting handle 133 cannot be gripped by the operator unless the seedling planting device 2 is raised to the raised position (non-working position). Therefore, when the seedling planting device 2 is in the lowered position (working position) and the leveling rotor 80 is lowered from the raised position (non-working position) to the lowered position (working position), the seedling planting device 2 is once raised. I have to let it. If the leveling rotor 80 is configured to be moved up and down by the rotor lifting / lowering motor 109 as in the second embodiment, the leveling rotor 80 is operated by operating the leveling rotor lifting / lowering switch 114 regardless of the position of the seedling planting device 2. Can be raised and lowered, so that workability can be improved.

In the said embodiment, as shown in FIG.6 and FIG.7, the traveling body 1 which mounted the engine 21, the seedling planting apparatus 2 installed in the back side of the traveling body 1 via the raising / lowering link mechanism 67, A rear axle case 33 for arranging the left and right rear wheels 4 via the left and right rear wheel axles 43, a leveling rotor 80 for leveling the planting surface, and a distribution shaft 91 for transmitting rear wheel driving power to the left and right axles 43; The rear axle case 33 is formed with an input shaft case portion 43a provided with a rear wheel input shaft 75, left and right final gear case portions 43b provided with left and right axles, and a side clutch case portion 43c provided with a distribution shaft 91. In the structure, power is transmitted to the leveling rotor 80 via the leveling rotor drive shaft 85, and the drive shaft case portion 43d is formed in the rear axle case 33, and the drive shaft case portion is formed. Since the leveling rotor drive shaft 85 is provided in 3d and the drive shaft case portion 43d is provided in two layers below the input shaft case portion 43a, the leveling rotor drive structure for extracting power to the leveling rotor 80 side is low cost. Can be placed. The drive shaft case portion 43d can be formed long in the front-rear direction by utilizing the front-rear width of the input shaft case portion 43a and the side clutch case portion 43c. That is, the drive shaft case portion 43d can be formed with a sufficient length in the front-rear direction necessary for housing the leveling rotor drive shaft 85. The input shaft case portion 43a and the drive shaft case portion 43d are reinforced with each other by the two-layer structure of the input shaft case portion 43a and the drive shaft case portion 43d, thereby reducing the weight while maintaining rigidity.

Further, according to the embodiment, as shown in FIGS. 7 and 8, the rear axle case 33 is opened with the rear shaft hole 33 b rearward, and the front drive shaft bearing 86 is formed on the front wall and the rear wall of the rear axle case 33. Since the front end side and the rear end side of the leveling rotor drive shaft 85 are rotatably supported via the drive shaft bearing 87 on the rear side, the leveling rotor drive unit 82 including the leveling rotor drive shaft 85 is supported. However, the rear axle case 33 can be easily put in and out, and the assembling workability of the leveling rotor drive unit 82 can be improved. By using the front end side of the leveling rotor drive shaft 85, the leveling rotor clutch 89 and the like can be provided in the drive shaft case portion 43d in a compact manner.

In the above embodiment, as shown in FIGS. 8 and 9, since the leveling rotor clutch 89 is provided on the front leveling rotor driving shaft 85 inside the driving shaft case portion 43d, the leveling rotor driving shaft is provided. The leveling rotor drive unit 82 including the leveling rotor clutch 89 and the like can be easily arranged around the center 85, and the assembly workability of the leveling rotor drive unit 82 can be improved.

In the above embodiment, as shown in FIGS. 7 and 8, the rear axle traveling input shaft 75 for transmitting the power from the engine 21 to the rear axle case 33 and the power of the rear wheel traveling input shaft 75 are branched. In this structure, a leveling rotor drive shaft 85 that transmits to the leveling rotor 80 is provided, and a rear shaft hole 33b for inserting the leveling rotor drive shaft 85 is formed in the rear axle case 33 and is opened toward the rear surface side of the rear axle case 33. Since the leveling rotor drive shaft 85 can be extracted from the rear axle hole 33b to the rear side of the rear axle case 33, it is necessary to provide a case for arranging the leveling rotor drive gear and the like separately from the rear axle case 33. Absent. The leveling rotor drive shaft 85 can be easily installed on the rear axle case 33. When the leveling rotor drive shaft 85 is not required, the rear shaft hole 33b can be easily closed with the lid 108. For example, even after the rice transplanter is shipped, the specification can be easily changed to a specification that does not include the leveling rotor 80 or a specification that includes the leveling rotor 80.

In the above embodiment, as shown in FIG. 7, the rear axle case 33 has a rear wheel travel input shaft 75 to which power from the engine 21 is transmitted and a left and right rear link in conjunction with the rear wheel travel input shaft 75. A distribution shaft 91 for transmitting power to the wheels 4 and a leveling rotor drive shaft 85 for transmitting power to the leveling rotor 80 in conjunction with the rear wheel traveling input shaft 75 are provided, and the rear wheels are plunged into the rear axle case 33. The travel input shaft 75 is provided with a distribution shaft gear 100a for interlocking the distribution shaft 91, and a drive shaft gear 100b for interlocking the leveling rotor drive shaft 85 is integrally formed with the distribution shaft gear 100a. Therefore, the drive shaft gear 100b and the distribution shaft gear 100a can be configured at low cost, and the drive shaft gear 100b and the distribution shaft gear 100a can be configured using the rear axle case 33. It can be assembled to the compact.

In the above embodiment, as shown in FIGS. 6 and 10, the rear axle case 33 has a rear wheel travel input shaft 75 to which power from the engine 21 is transmitted, and a left and right side in conjunction with the rear wheel travel input shaft 75. A distribution shaft 91 that transmits power to the rear wheel 4 and a leveling rotor drive shaft 85 that transmits power to the leveling rotor 80 in conjunction with the rear wheel traveling input shaft 75 are provided. The distribution shaft 91 is connected via the shaft bevel gear 100a and the interlocking bevel gear 107, and the leveling rotor drive shaft 85 is offset in a direction away from the interlocking bevel gear 107 across the rear wheel input shaft 75 in plan view. Thus, the leveling rotor drive shaft 85 can be supported at the position of the rear axle case 33 corresponding to the input portion of the leveling rotor 80. The vertical mounting width dimension of the rear wheel traveling input shaft 75 and the leveling rotor drive shaft 85 can be configured in a compact manner. The leveling rotor drive shaft 85 can be assembled to the rear axle case 33 without causing the rear axle case 33 to protrude downward and with almost no restriction on the arrangement of the rear wheel travel input shaft 75.

Further, in the above embodiment, as shown in FIGS. 7 to 9, it has a structure including a leveling rotor clutch 89 that turns on and off the power transmission to the leveling rotor drive shaft 85, and the distribution shaft gear is formed by a bevel gear ( The distribution shaft bevel gear 100a) and the drive shaft gear are formed by flat gears (drive shaft flat gear 100b). The drive shaft flat gear 100b is formed to have a larger diameter than the distribution shaft bevel gear 100a, and the rear wheel travel input. Since the ground leveling rotor drive shaft 85 is arranged in parallel with the shaft 75 and the leveling rotor clutch 89 is provided in front of the interlocking flat gear 88 of the leveling rotor drive shaft 85, it is distributed with the drive shaft flat gear 100b. The shaft bevel gear 100a can be easily processed by forging or the like, and the manufacturing cost can be reduced. In the rear axle case 33, the leveling rotor drive shaft 85 can be extended forward of the interlocking flat gear 88, and the leveling rotor clutch 89 can be compactly installed in front of the leveling rotor drive shaft 85.

In the above embodiment, as shown in FIG. 8, the drive shaft flat gear 100b is formed integrally with the distribution shaft bevel gear 100a of the rear wheel travel input shaft 75, and the drive shaft flat gear 100b is interposed therebetween. Since the leveling rotor driving shaft 85 is connected to the rear wheel traveling input shaft 75, the rear wheel traveling input shaft 75 or the leveling rotor driving shaft 85 can be attached to and detached from the rear axle case 33 by inserting and removing in the axial direction. Assembly / disassembly workability of the rear wheel traveling input unit 90 including the rear wheel traveling input shaft 75 or the leveling rotor driving unit 82 including the leveling rotor driving shaft 85 can be improved.

Further, in the above embodiment, as shown in FIGS. 8 and 9, the interlocking flat gear 88 for connecting the leveling rotor driving shaft 85 to the leveling rotor driving shaft 85, the rear wheel traveling input shaft 75, and the rear wheel traveling input. The leveling rotor clutch 89 for turning on and off the transmission of power from the shaft 75 to the leveling rotor driving shaft 85 and the

bearings

86 and 87 for the leveling rotor driving shaft 85 are arranged to constitute the leveling rotor driving unit 82. Since the leveling rotor drive unit 82 is provided so as to be removable from the rear surface side, the leveling rotor drive shaft 85 can be attached to and detached from the rear axle case 33 by inserting and removing in the axial direction. Assembly / disassembly workability of the leveling rotor drive unit 82 can be improved.

1 traveling machine body 2 seedling planting device 4 rear wheel 21 engine 33 rear axle case 33b rearward shaft hole 34 rear wheel axle 35 leveling device 43a input shaft case portion 43b final gear case portion 43c side clutch case portion 43d drive shaft case portion 46 seedling stand 57 Planting claws 67 Elevating link mechanism 75 Rear wheel travel input shaft 80 Leveling rotor 85 Leveling rotor drive shaft 89 Leveling rotor clutch 91 Distribution shaft

Claims

A traveling machine body equipped with an engine, a seedling planting device installed on the rear side of the traveling machine body via an elevating link mechanism, a rear axle case that arranges left and right rear wheels via left and right rear wheel axles; A leveling rotor for leveling the planting surface and a distribution shaft for transmitting rear wheel driving power to the left and right axles. In the rice transplanter formed with the final gear case part and the side clutch case part provided with the distribution shaft,
A structure for transmitting power to the leveling rotor via a leveling rotor drive shaft, wherein the rear axle case is formed with a drive shaft case portion, the drive shaft case portion is provided with the leveling rotor drive shaft, and the input shaft case A rice transplanter characterized in that the drive shaft case part is provided in two layers below the part.
The rear axle case is provided with a rear wheel travel input shaft that transmits power from the engine, and a leveling rotor drive shaft that branches the power of the rear wheel travel input shaft and transmits the power to the leveling rotor, A rearward shaft hole into which the leveling rotor drive shaft is inserted is formed in the rear axle case, and the leveling rotor drive shaft is located on the rear side of the rear axle case from the rearward shaft hole opened toward the rear side of the rear axle case. The rice transplanter according to claim 1, wherein the rice transplanter is configured to be able to be extracted.
The rear axle case includes a rear wheel travel input shaft to which power from the engine is transmitted, a distribution shaft that transmits power to the left and right rear wheels in conjunction with the rear wheel travel input shaft, and the rear wheel travel. A leveling rotor drive shaft that transmits power to the leveling rotor in conjunction with the input shaft, and a distribution shaft gear that links the distribution shaft to the rear wheel traveling input shaft that has entered the rear axle case. 2. The rice transplanter according to claim 1, wherein a drive shaft gear for interlocking with the leveling rotor drive shaft is formed in the distribution shaft gear.
The rear axle case includes a rear wheel travel input shaft to which power from the engine is transmitted, a distribution shaft that transmits power to the left and right rear wheels in conjunction with the rear wheel travel input shaft, and the rear wheel travel. A leveling rotor drive shaft that transmits power to the leveling rotor in conjunction with the input shaft is provided, and the distribution shaft is connected to the rear wheel traveling input shaft via an input side bevel gear and an output side bevel gear, 2. The rice transplanter according to claim 1, wherein the ground leveling rotor drive shaft is offset in a direction away from the output bevel gear across the rear wheel travel input shaft.
The leveling rotor clutch includes a leveling rotor clutch that turns on and off the power transmission to the leveling rotor drive shaft, wherein the distribution shaft gear is formed by a bevel gear, the drive shaft gear is formed by a flat gear, and the drive shaft gear is more than the bevel gear. A flat gear is formed in a large diameter, a leveling rotor drive shaft is arranged in parallel to the rear wheel travel input shaft, and the leveling rotor clutch is provided in front of the flat gear of the leveling rotor drive shaft. The rice transplanter according to claim 3.
A drive shaft flat gear is formed integrally with the input side bevel gear of the rear wheel drive input shaft, and the leveling rotor drive shaft is connected to the rear wheel drive input shaft via the drive shaft flat gear. The rice transplanter of Claim 4 characterized by these.
An interlocking spur gear that connects the ground leveling rotor drive shaft to the rear wheel travel input shaft to the leveling rotor drive shaft, and a leveling rotor clutch that turns power transmission from the rear wheel travel input shaft to the leveling rotor drive shaft on and off. And a bearing for the leveling rotor drive shaft is arranged to constitute a leveling rotor drive unit, and the leveling rotor drive unit is provided so as to be extractable from the rear surface side of the rear axle case. The rice transplanter described.