JP2009178123A - Rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that mounting of a driving mechanism of a land grading device in a transmission case of a rice transplanter makes a location of the output shaft lower, further makes ground clearance still lower, and that results in danger of interfering with obstacles below rice fields. <P>SOLUTION: The rice transplanter comprises such a construction that a rotation driving force of a land grading device 51 is taken out via a rear axle case 11 that drives and supports rear wheels 12. The power is divided and took out from middle shaft 24 of left and right sides, that are arranged at upstream side in term of power transmission as opposed to rear axles 14 for driving the rear wheels 12 mounted within the rear axle case 11, and the powers took out from the left and right sides are transmitted to a power transmission shaft 19 and unified, and then is transmitted from the power transmission shaft 19 to the land grading device 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a rice transplanter equipped with a leveling device for leveling a farm scene in front of a planting unit so as to transmit a driving force from the traveling unit to the leveling device without providing a drive mechanism for the leveling device in the mission case. Related to the technology.

Conventionally, as one mode of a rice transplanter, a rice transplanter in which a planting unit is connected to a rear part of a traveling unit so as to be movable up and down and a ground leveling device is provided in front of the planting unit is known (for example, “Patent Document 1”). "reference.).
JP-A-8-9730

  The drive transmission mechanism to the leveling device in the “Patent Document 1” is provided at the left and right center of the rear part of the mission case, and the PTO output shaft provided in the drive transmission mechanism extends rearward, and the leveling via the universal joint. It is configured by connecting to the input shaft of the device. In this case, a drive mechanism for driving the leveling device in the mission case needs to be provided separately from the drive mechanism for the traveling unit and the planting unit, and the mission case is to be enlarged accordingly.

  In particular, a small Shijo-class rice transplanter has a lower ground clearance than a relatively large rice transplanter and a PTO output shaft for driving the planting unit is located near the center of the mission case. In the case where the PTO output shaft for the device is extended near the center of the left and right sides of the transmission case and from the rear to the rear, there is no space and it is difficult to provide a drive mechanism in the transmission case. It was.

  Also, in a small Shijo-class rice transplanter, if the mission case is equipped with a drive mechanism for leveling equipment, the output shaft will be placed at a lower position, and the minimum ground clearance will be further reduced. There was a risk of interference.

  Therefore, in the present invention, the drive transmission mechanism of the leveling device for leveling the farm scene in front of the planting part takes out power from the rear axle case for driving the rear wheels, and outputs the output shaft above the rear axle. It is provided to transmit power to the leveling device via a transmission shaft or the like. Furthermore, when power is taken out from the left and right rear axle case, the drive cannot be performed if the side clutch is disengaged, so the power is taken from the rear axle cases on both sides and joined to transmit the power to the leveling device. It is.

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.
That is, according to the first aspect, in the rice transplanter equipped with a leveling device for leveling the farm scene by rotational motion in front of the planting portion, the rotational driving force of the leveling device is taken out from the rear axle case that drives and supports the rear wheels. The power is branched and taken out from the left and right intermediate shafts arranged upstream of the power transmission with respect to the final transmission shaft for driving the rear wheels in the rear axle case. And the driving force is transmitted from the merging shaft to the leveling device.
According to a second aspect of the present invention, the rear axle case includes a middle case body that extends in the left-right direction, and an outer case body that closes both left and right ends of the middle case body, and the end of the intermediate shaft from the left and right outer case bodies. The intermediate case that protrudes through the outer portion and is inserted into one side of the left and right intermediate cases and houses the power transmission means after branching is disposed between the outer case body and the rear wheel, The other side of the case extends obliquely upward in a side view, and the other sides of the left and right intermediate cases are connected by a connecting case that houses the merging shaft.
According to a third aspect of the present invention, the junction shaft is disposed so as to straddle the upper side of the transmission case or the rear axle case.

As effects of the present invention, the following effects can be obtained.
In claim 1, since it is not necessary to provide a drive mechanism for driving the leveling device in the mission case, the conventional mission case can be used as it is without increasing the size of the mission case or lowering the minimum ground clearance. Can be retrofitted. Also, the leveling device needs to be larger than the number of rotations of the rear wheels, and the power is taken out from the intermediate shaft before decelerating to the rear axle in the rear axle case and transmitted to the leveling device. The mechanism can be simplified. In addition, power is taken out from the left and right intermediate shafts and merged from the left and right to transmit power to the leveling device, so even if the left or right side clutch mechanism is activated and power transmission is cut off, Power is transmitted and can be driven constantly.
In the second aspect, the intermediate case can transmit the power after branching by effectively utilizing the space between the outer case body of the rear axle case and the rear wheel. Further, since the front sides of the left and right intermediate cases are connected to the connection case, rigidity can be ensured.
In the third aspect of the present invention, the confluence shaft is disposed at a higher position than the transmission case or the rear axle case, so that it can be protected from mud scattering from below and the minimum ground clearance is not lowered.

  Next, embodiments of the invention will be described.

  FIG. 1 is a side view showing an overall structure of a rice transplanter according to an embodiment of the present invention, FIG. 2 is a plan sectional view showing the whole rear axle case, and FIG. 3 is a schematic view showing a power transmission path from the rear axle case to the leveling device. FIG. 4 is a plan sectional view showing a power take-out mechanism to the leveling device.

  First, the whole structure of the rice transplanter 1 which concerns on one Example of this invention is demonstrated using FIG. In the following description, the direction of arrow A shown in the figure is the forward direction.

  The rice transplanter 1 includes a traveling unit 2 and a planting unit 3, and is configured such that the planting unit 3 is connected to a rear portion of the traveling unit 2 by an elevating mechanism 4 so as to be movable up and down. The traveling unit 2 includes a body frame 5, an engine is mounted in a bonnet 7 provided at the front thereof, and a mission case 6 is disposed below the engine.

  A front axle case (not shown) is disposed on both the left and right sides of the front portion of the transmission case 6, and front wheels 10 and 10 are attached to the left and right sides of the front axle case, respectively. A rear axle case 11 is provided at the rear of the body frame 5, and rear wheels 12 and 12 are attached to the left and right sides of the rear axle case 11, respectively.

Then, the engine and the transmission case 6 are interlocked and connected via a transmission belt, and further shifted in the transmission case 6 to drive power to the front wheels 10 and the rear wheels 12 via a power transmission mechanism in the front axle case and the rear axle case 11. Is transmitted.
In the present embodiment, the transmission case 6 (see FIG. 2) and the rear axle case 11 are integrally formed as a traveling mission 8.

  In the traveling unit 2, a driving operation unit 15 is disposed in the front and rear center of the body frame 5. In the driving operation unit 15, a steering handle 16 for performing a steering operation of the traveling unit 2 and a shift pedal for performing a shifting operation of the traveling unit 2 are provided at the front. On the other hand, a seat 17 is provided behind the steering handle 16.

  The planting unit 3 includes a planting frame 21, a planting mission 22, a transmission shaft case 23, a planting transmission case 25, a seedling stand 29, a planting claw 28, and the like. In the planting unit 3, a planting frame 21 is disposed behind the traveling unit 2, and a planting mission 22 is provided at the lower center of the planting frame 21. A transmission shaft case 23 extends from the planting mission 22 in the left-right direction, and a plurality of planting transmission cases 25 extend rearward from the transmission shaft case 23 at appropriate intervals. A planting claw 28 is provided at a rear portion of the planting transmission case 25 via a rotary case 27.

  Then, the planting mission 22 and the planting claw 28 of each planting transmission case 25 are linked together via a power transmission shaft case 23 or a power transmission mechanism in the planting transmission case 25, and from the engine of the traveling unit 2. The power transmitted to the planting mission 22 through the PTO transmission shaft 66 (see FIGS. 2 and 6) or the like is transmitted from the planting mission 22 to the planting claw 28, and the planting The claw 28 is configured to be driven.

  A seedling stand 29 is disposed above the planting transmission case 25 and is attached to the rear portion of the planting frame 21 so as to be capable of reciprocating left and right. Thus, after the seedling stage 29 has been moved to the appropriate position in the left-right direction, the seedlings are cut out from the seedling mat placed on the seedling stage 29 by the planting claws 28 and planted in the field. It has become.

  A float device is provided below the planting transmission case 25. In the float apparatus, a center float 31 and side floats 32 and 32 are provided, and the center float 31 serving as a sensor float is located in the center of the left and right, and the side floats 32 and 32 are located on both the left and right sides of the center float 31. Has been placed. The center float 31 and the side floats 32 and 32 are supported at the rear part so as to be swingable in the vertical direction via a float support body extending in the left-right direction in parallel with the transmission shaft case 23.

  An elevating mechanism 4 is provided between the traveling unit 2 and the planting unit 3. In the elevating mechanism 4, a top link 42 and a lower link 43 are installed between a support frame 67 erected on the rear axle case 11 and a support bracket connected to the front lower part of the planting frame 21 so as to be able to swing left and right. An elevating cylinder 44 is connected between the front portion of the lower link 43 and the traveling unit 2. When the lifting / lowering cylinder 44 is expanded and contracted, the planting unit 3 is configured to move up and down with respect to the traveling unit 2 via the top link 42 and the lower link 43.

  Here, the lifting / lowering cylinder 44 is configured to be expanded and contracted by switching a hydraulic valve of a hydraulic driving unit (not shown). An interlocking wire is interposed between the hydraulic valve and the front end portion of the center float 31 of the planting part 3, and the hydraulic valve is operated in conjunction with the swing of the center float 31 by the interlocking wire. Thus, the elevating cylinder 44 is extended and contracted. Thereby, according to the height of the planting surface G of the farm field sensed with the center float 31, the planting part 3 can be raised / lowered appropriately and the planting depth of a seedling can be kept constant. .

  A leveling device 51 is provided below the lifting mechanism 4 between the rear wheel 12 and the floats 31 and 32. The leveling device 51 is disposed in front of the center float 31 and the side float 32 of the planting unit 3 and includes a leveling roller 52 extending in the left-right direction of the machine body. The power leveling device 51 is provided in the rear axle case 11 of the traveling unit 2. The mechanism 35 is linked via a mechanism 35.

  In addition, a rotation support shaft 55 is rotatably mounted on the planting frame 21 via brackets (not shown) provided on both left and right sides of the planting frame 21. A support member 57 made up of a plurality of link mechanisms is provided below and extends downward. The leveling device 51 is supported at the lower end of the support member 57 so as to be movable up and down.

  Further, an elevating operation lever 56 extending forward of the machine body is attached to the central portion of the rotation support shaft 55, and the leveling device 51 is interposed via the support member 57 by rotating the elevating operation lever 56 in the front-rear direction. Can be moved up and down. That is, when the lifting operation lever 56 is rotated forward, the leveling device 51 is raised, and conversely, when the lifting operation lever 56 is rotated rearward, the leveling device 51 is lowered.

  Thus, the power transmitted to the rear axle case 11 is transmitted to the leveling roller 52 via the power take-off mechanism 35, and the leveling roller 52 is rotationally driven. Thereby, leveling such as a headland in an agricultural field is made possible by the leveling device 51.

  Next, details of the power take-out mechanism 35 that transmits power from the rear axle case 11 according to the present invention to the leveling device 51 will be described with reference to FIGS. In the following description, the direction of arrow A shown in the figure is the forward direction. Further, the rear axle case 11 in the present embodiment has an integral structure with the transmission case 6 disposed in the front-rear direction of the airframe, but is not limited thereto, and both members may be structured independently. .

  The rear axle case 11 is provided so as to extend in the left-right direction in plan view, and is divided into left and right parts at the center thereof, and the left and right cases are fixed by bolts or the like. Inside each of the left and right sides of the rear axle case 11, an intermediate shaft 24 and a rear axle 14 are horizontally mounted in parallel in the front-rear direction, and the intermediate shaft 24 and the rear axle 14 are interlocked via a gear. Is done.

  The intermediate shaft 24 is disposed on the upstream side of the power transmission with respect to the rear axle 14 serving as the final transmission shaft, and a rear intermediate gear 26 is fixed to the front end portion of the vehicle body, and a bearing 33 is mounted on the rear axle case 11. It is pivotally supported via the shaft. A gear portion 24a that meshes with a final gear (reduction gear) 30 fixed to the rear axle 14 is formed at the other end, and an outer shaft portion of the gear portion 24a is an outer portion that will be described later. The case body 11b is rotatably supported via a bearing 34, and further protrudes outside through the outer case body 11b.

  The rear axle case 11 includes a middle case body 11a extending in the left-right direction, and an outer case body 11b disposed so as to close the openings at both left and right ends of the middle case body 11a. The outer case body 11b is formed in a substantially oval shape along the outer shape of the opening at the left and right ends of the middle case body 11a in a side view, and the place where the rear axle 14 is arranged faces outward in a mortar shape. The opening 11c is provided with a circular opening 11c at its end face, and the rear axle 14 is supported by the opening 11c via a bearing. The other end of the rear axle 14 protrudes outward. In this way, when the driving force of the engine is transmitted to the intermediate shaft 24 via the rear intermediate gear 26, the driving force is transmitted to the rear axle 14 via the final gear 30, and the rear wheel 12 is rotationally driven.

  In addition, a circular opening 11d is provided at a location where the intermediate shaft 24 of the outer case body 11b is disposed, and the intermediate shaft 24 is supported by the opening 11d via a bearing 34, and an end thereof is provided. The part protrudes toward the outside. A sprocket 38 is fixed to the tip of the outer projecting portion of the intermediate shaft 24 so that power can be taken out.

  The rear axle case 11 has a configuration in which the driving force from the traveling mission 8 (see FIG. 1) is transmitted to the rear intermediate gear 26 via the side clutch mechanism 68 at the center in the left-right direction. The rear intermediate gear 26 is meshed with a sliding gear 62, and the left and right sliding gears 62 and 62 are respectively formed with claw portions on the inside and meshed with claw portions formed on both sides of the center sprocket 63. The center sprocket 63 is transmitted with power after shifting through a chain or the like.

  Further, the sliding gear 62 is engaged with a clutch fork (not shown), and the clutch fork is interlocked with the steering handle 16. When the steering handle 16 is rotated more than a set angle, the clutch fork on the turning direction side is rotated. Thus, the sliding gear 62 is slid so that the engagement of the claw portion is released. Accordingly, when the steering handle 16 is rotated by a set angle or more during turning or the like, power is not transmitted from the center sprocket 63 to the sliding gear 62, and the rear wheel 12 on the left and right side is not driven to rotate. Since the rear wheel 12 is driven to rotate, the airframe can make a further small turn in addition to the left-right rotation of the front wheel 10.

Next, details of the power take-out mechanism 35 according to the present invention will be described with reference to FIGS.
The power take-out mechanism 35 is a mechanism for taking out a part of the driving power for the rear wheels 12 and transmitting the drive to the leveling device 51. The power take-out mechanism 35 is connected to the outer projecting portion of the intermediate shaft 24, and is connected to the outer protruding portion of the rear axle case 11 Is provided.

  The power take-out mechanism 35 is disposed at both ends of the sprocket 38 fixed to the outer projecting portion of the intermediate shaft 24, the power transmission shaft 19 that is arranged in parallel with the intermediate shaft 24 and serves as a merging shaft, and the power transmission shaft 19. Sprockets 39, 39, a one-way clutch 41 disposed between the sprocket 39 and the power transmission shaft 19, the drive chain 20 wound between the sprocket 39 and the sprocket 38, and the outer case body 11b. An intermediate case 18 that is disposed between the rear wheel 12 and accommodates the power transmission means after branching, a connecting case 58 that accommodates the power transmission shaft 19 and is horizontally mounted between the left and right intermediate cases 18 and 18. Prepare. Since the power take-out mechanism 35 is configured to be substantially symmetrical left and right, only the left and right sides will be described.

  The intermediate case 18 is a box-shaped case body having a substantially rectangular shape or an elliptical shape in a side view, and is disposed between the outer case body 11b and the rear wheel 12 in the left-right direction, and is located on the left side of the rear axle case 11. It arrange | positions so that it may extend toward the front slanting upper side by a side view from a surface, and it is assembled | attached and fixed to the said outer case body 11b via the volt | bolt etc. The intermediate case 18 is divided into left and right in a plan view, and is fixed to be detachable by bolts or the like.

  An opening is formed on the inner side of the rear portion of the intermediate case 18 (side surface on the rear axle case 11 side) so that the end portion of the intermediate shaft 24 that protrudes outside through the outer case body 11b can be inserted. A sprocket 38 is fixed to the end of the intermediate shaft 24. In addition, the front portion of the intermediate case 18 is rotatably supported by opening a through hole on the inside and inserting one end portion of the power transmission shaft 19. A sprocket 39 is mounted on the end of the power transmission shaft 19 via a one-way clutch 41. A drive chain 20 is wound around the sprocket 38 and the sprocket 39 and is connected so that power is transmitted from the intermediate shaft 24 to the power transmission shaft 19. However, the one-way clutch 41 may be configured to be interposed between the intermediate shaft 24 and the sprocket 38. The intermediate shaft 24 and the ends of the power transmission shaft 19 are rotatably supported by bearings 61 and 61, respectively.

  As described above, the power transmission shaft 19 is provided in the left-right direction in parallel with the intermediate shaft 24, and is disposed above the front axle of the rear axle case 11. The left end portion of the power transmission shaft 19 is disposed at substantially the same position as the left end portion of the left intermediate shaft 24 in plan view, and the right end portion of the power transmission shaft 19 is substantially the same as the right end portion of the right intermediate shaft 24 in plan view. Arranged at the same position.

  In this way, the rotational driving force of the leveling device 51 is extracted from the rear axle case 11 that drives and supports the rear wheel 12, and the rear axle 14 that is the final transmission shaft for driving the rear wheel 12 in the rear axle case 11 is used. The power is branched and extracted from the left and right intermediate shafts 24 arranged on the upstream side of the power transmission, and the power is converted into a combined shaft through power transmission means such as the sprockets 38 and 39, the drive chain 20, and the one-way clutch 41. The transmission shaft 19 is transmitted and merged.

  By adopting such a configuration, there is no need to provide a drive mechanism for driving the leveling device 51 in the mission case 6, so that the conventional transmission case 6 can be made without increasing the size of the mission case 6 or reducing the minimum ground clearance. The mission case can be used as is and can be retrofitted. Further, the leveling device 51 needs to be larger than the rotational speed of the rear wheel 12, and the power is taken out from the intermediate shaft 24 before being decelerated with respect to the rear axle 12 in the rear axle case 11 and transmitted to the leveling device 51. The transmission mechanism for speeding up can be simplified. Also, the power is taken out from the left and right intermediate shafts 24, 24 and joined from the left and right to transmit the power to the leveling device 51. Therefore, either the left or right side clutch mechanism 68 is operated and the transmission of power is cut off. Also, power can be transmitted from the other of the left and right sides, and can always be driven.

  Further, since the power transmission shaft 19 serving as the merging shaft is disposed so as to straddle the upper side of the transmission case 6 or the rear axle case 11, the power transmission shaft 19 is disposed at a position higher than the transmission case 6 or the rear axle case 11. Therefore, it can be protected from mud splashes from below, and the minimum ground clearance is not lowered.

  Further, a power transmission shaft 19 is horizontally connected between the left and right intermediate cases 18 and 18, and is connected to a power transmission path between the left and right intermediate shafts 24 and 24 and the power transmission shaft 19 serving as a merging shaft, respectively. Since the one-way clutches 41 and 41 are arranged, the leveling device 51 does not rotate reversely by the one-way clutch 41, mud splashing in the reverse direction (front and upper) does not occur, and the surroundings are not soiled. . Further, even if there is a rotational difference between the power extracted from the left and right, the power transmission shaft 19 is not overloaded.

  The intermediate case 18 stores the power transmission means such as the sprockets 38 and 39 after branching and the drive chain 20 and the one-way clutch 41, so that the one-way clutch 41 is stored in the intermediate case 18 in a compact manner. Thus, the power transmission means, the one-way clutch 41, and the like can be protected from mud splashes from the rear wheels 12. In addition, maintenance and the like can be easily performed.

  A connecting case 58 is provided horizontally between the front inner sides of the left and right intermediate cases 18. A power transmission shaft 19 serving as a merging shaft is accommodated in the connection case 58. The connection case 58 includes shaft cases 59 and 59 configured in left and right cylinders, and an output shaft case 60 disposed between the shaft cases 59 and 59. The connection case 58 is disposed so as to straddle the rear upper side of the transmission case 6, or a shaft case 59 on one side of the left and right is fixed to the rear side surface of the transmission case 6 so as to penetrate the power transmission shaft 19. Is done.

  In this manner, the intermediate case 18 that houses the power transmission means after branching extends obliquely forward and upward in a side view, and the inner side of the forward projecting side end portions of the left and right intermediate cases 18 and 18 is the power transmission. Since it is connected by the connecting case 58 that houses the shaft 19, the intermediate case 18 can transmit the power after branching by effectively utilizing the space between the outer case body 11 b of the rear axle case 11 and the rear wheel 12. Since the front sides of the left and right intermediate cases 18 and 18 are connected by the connecting case 58, the rigidity can be increased and the main shaft case 60 and the like described later can be stably supported.

  The output shaft case 60 is disposed on one side of the left and right sides of the transmission case 6 and is fixed by bolts or the like. Thus, the rear axle case 11, the intermediate cases 18, 18 fixed to the left and right sides of the rear axle case 11, and the connection case 58 fixed between the intermediate cases 18, 18 and fixed to the transmission case 6. However, since they are integrally connected and fixed, they are firmly connected to each other, so that the rigidity is high and the strength can be increased.

  A clutch mechanism 37, which is downstream of the one-way clutch 41 and transmits power to the leveling device 51, is disposed between the power transmission shaft 19 and the leveling output shaft 9. In other words, the power transmission shaft 19 penetrates the output shaft case 60 in the left-right direction and is rotatably supported in the output shaft case 60, and the bevel gear 36 is fixed to the middle of the power transmission shaft 19 in the output shaft case 60. A clutch mechanism 37 is disposed between the bevel gear 36 and the leveling output shaft 9 supported in the output shaft case 60.

  More specifically, the output shaft case 60 is formed in a substantially cylindrical shape, extends rearward in the longitudinal direction of the machine body, and is disposed above the rear axle case 11. One ends of the shaft cases 59 and 59 are respectively connected and fixed to both sides of the front portion of the output shaft case 60, and the power transmission shaft 19 is rotatably supported in the output shaft case 60 and the shaft cases 59 and 59. The bevel gear 36 is fixed on the power transmission shaft 19 in the output shaft case 60.

The leveling output shaft 9 is rotatably supported in the front and rear direction in the output shaft case 60 via a bearing, and the rear end of the leveling output shaft 9 projects through the rear surface of the output shaft case 60. ing. The power is transmitted from the rear end of the leveling output shaft 9 to the leveling device 51 via a universal joint or a transmission shaft.
The leveling output shaft 9 is provided so as to extend in a direction orthogonal to the power transmission shaft 19 in a plan view and rearward in a side view.

  A bevel gear 40 is loosely fitted on the middle part of the leveling output shaft 9 in a freely rotating manner, and the bevel gear 40 is meshed with the bevel gear 36. A clutch mechanism 37 is provided between the bevel gear 40 and the leveling output shaft 9 so that the power extracted from the intermediate shaft 24 can be easily connected and disconnected. Further, in the present embodiment, the clutch mechanism 37 is configured to be connected / disconnected by engagement of a clutch pawl, but it may be of a dog type or a multi-plate type, and is not limited.

The clutch mechanism 37 will be described with reference to FIGS. 3 and 4. The clutch mechanism 37 includes a bevel gear 40, a sliding body 45, a fork body 46, an operation lever, and the like.
A claw portion 40 a is formed at the rear portion of the bevel gear 40. The sliding body 45 is formed in a cylindrical shape, and is spline-fitted to the rear portion of the leveling output shaft 9 so as to be slidable in the axial direction and not relatively rotatable. A claw portion 45 a that engages with the claw portion 40 a is provided at the end portion (front end portion) of the sliding body 45 on the bevel gear 40 side.

  A compression spring 48 is externally fitted as an elastic body between the inner peripheral portion or the rear end of the sliding body 45 and the notched portion 9 a provided at the rear portion of the leveling output shaft 9. Therefore, the sliding body 45 is pushed toward the bevel gear 40 by the compression spring 48, and is urged so that the claw portion 40a and the claw portion 45a are engaged. Further, a fitting groove 45b is formed on the outer peripheral portion of the sliding body 45, and the tip of the fork body 46 is fitted into the fitting groove 45b.

  A base portion of the fork body 46 is fixed to a lever shaft of an operation lever (not shown), and the operator can connect and disconnect the clutch by operating the operation lever. Further, the operation lever and the above-described lifting operation lever 56 may be linked. Further, the operation lever may be connected to the planting part 3 via a wire 54 (FIG. 1) or the like, and the clutch mechanism 37 may be connected and disconnected in conjunction with the raising and lowering of the planting part 3.

  That is, when the planting part 3 is lowered, the operating lever is rotated, the sliding body 45 is slid forward through the fork body 46, and the claw part 45a of the sliding body 45 and the claw part 40a of the bevel gear 40 are engaged. Thus, the clutch mechanism 37 becomes “contact”. In this way, power is transmitted from the intermediate shaft 24 to the ground leveling output shaft 9 from the sprocket 38, the drive chain 20, the sprocket 39, the one-way clutch 41, the power transmission shaft 19, the bevel gears 36 and 40, and the sliding body 45. Further, when the planting part 3 is raised, when the operating lever is rotated in the opposite direction, the sliding body 45 is slid backward against the urging force of the compression spring 48, and the claw part 45a and The engagement of the claw portion 39a is released, and the bevel gear 40 rotates idly on the leveling output shaft 9, and the driving force from the rear axle case 11 is cut off.

  As described above, the clutch mechanism 37 on the downstream side of the one-way clutch 41 and for connecting and disconnecting the driving force to the leveling device 51 is disposed between the power transmission shaft 19 and the leveling output shaft 9. Therefore, there is no need to dispose a clutch mechanism for each path through which power is extracted from the left and right, and only one place is required, and the number of parts, mass, and the like can be reduced.

The side view which shows the whole rice transplanter structure concerning one Example of this invention. FIG. 3 is a plan sectional view showing the entire rear axle case. The schematic diagram which shows the power transmission path | route from a rear axle case to a leveling apparatus. The plane sectional view showing the power extraction mechanism to the leveling device.

Explanation of symbols

6 Transmission case 9 Output shaft for leveling 11 Rear axle case 11a Middle case body 11b Outer case body 12 Rear wheel 14 Rear axle (final transmission shaft)
18 Intermediate case 19 Power transmission shaft (confluence shaft)
24 intermediate shaft 35 power take-out mechanism 37 clutch mechanism 51 leveling device

Claims (3)

  In a rice transplanter equipped with a leveling device for leveling the farm scene by rotational movement in front of the planting part, the rotational driving force of the leveling device is configured to be taken out from a rear axle case that drives and supports the rear wheel, and the rear axle case The power is branched out from the left and right intermediate shafts arranged on the upstream side of the power transmission with respect to the final transmission shaft for driving the rear wheel in the inside, and this left and right extracted power is transmitted to the merging shaft to be merged, A rice transplanter characterized in that a driving force is transmitted from a shaft to the leveling device.   The rear axle case includes a middle case body that extends in the left-right direction and an outer case body that closes both left and right ends of the middle case body, and penetrates the end of the intermediate shaft outward from the left and right outer case bodies. Projecting and inserted into one side of the left and right intermediate cases, the intermediate case accommodates the power transmission means after branching and is disposed between the outer case body and the rear wheel, and the other side of the intermediate case is The rice transplanter according to claim 1, wherein the rice transplanter extends obliquely forward and upward as viewed, and the other sides of the left and right intermediate cases are connected to each other by a connecting case that houses the merging shaft.   The rice transplanter according to claim 2, wherein the junction shaft is disposed so as to straddle the upper side of the transmission case or the rear axle case.

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